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Sample records for boilers emulsiones agua

  1. Fuel oil-water emulsions to reduce unburned particle emissions from boilers; Emulsiones agua en combustoleo para reducir las emisiones de particulas inquemadas en calderas

    Energy Technology Data Exchange (ETDEWEB)

    Diego Marin, Antonio; Ocampo Barrera, Rene; Martinez Flores, Marco Antonio; Tamayo Flores, Gustavo Adolfo; Alarcon Quiroz, Ernesto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1997-12-31

    To diminish the problems caused by fuels in boilers such as abnormal soiling of heat interchange surfaces, decrease of thermal and combustion efficiencies and increment of pollutants it is proposed the utilization of fuel oil water emulsions. This technology process is described, its development and application in other countries is shown and mention is made of the experiences in this regard at the Instituto de Investigaciones Electricas (IIE), as well as the perspectives this technology has in Mexico. In conclusion, the fuel oil water emulsion is an alternative that can help burning efficiently the fuel oil and so to contribute to fulfill with the limits established by the environmental regulations on pollutant emissions. The development of this technology is economical and of simple application, compared with others, such as the installation of new burners, the utilization of a commercial technology for flue gas conditioning, etcetera [Espanol] Para disminuir los problemas ocacionados por el combustoleo en las calderas como: ensuciamientos anormales de las superficies de intercambio de calor, disminucion de eficiencias termicas y de combustion e incremento de las emisiones, se propone la utilizacion de la emulsion de agua en combustoleo. Se describe el proceso de esta tecnologia, se muestra su desarrollo y aplicacion en otros paises y se mencionan las experiencias a este respecto en el Instituto de Investigaciones Electricas (IIE), asi como las perspectivas que tiene esta tecnologia en Mexico. En conclusion, la emulsion de agua en combustoleo es una alternativa que puede ayudar a quemar eficientemente al combustoleo y asi contribuir a cumplir con los limites de emisiones que establecen normas ambientales. El desarrollo de esta tecnologia es economica y de aplicacion sencilla, comparada con otras como: la instalacion de nuevos quemadores, la utilizacion de una tecnologia comercial para acondicionar los gases de combustion, etcetera

  2. Fuel oil-water emulsions to reduce unburned particle emissions from boilers; Emulsiones agua en combustoleo para reducir las emisiones de particulas inquemadas en calderas

    Energy Technology Data Exchange (ETDEWEB)

    Diego Marin, Antonio; Ocampo Barrera, Rene; Martinez Flores, Marco Antonio; Tamayo Flores, Gustavo Adolfo; Alarcon Quiroz, Ernesto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-12-31

    To diminish the problems caused by fuels in boilers such as abnormal soiling of heat interchange surfaces, decrease of thermal and combustion efficiencies and increment of pollutants it is proposed the utilization of fuel oil water emulsions. This technology process is described, its development and application in other countries is shown and mention is made of the experiences in this regard at the Instituto de Investigaciones Electricas (IIE), as well as the perspectives this technology has in Mexico. In conclusion, the fuel oil water emulsion is an alternative that can help burning efficiently the fuel oil and so to contribute to fulfill with the limits established by the environmental regulations on pollutant emissions. The development of this technology is economical and of simple application, compared with others, such as the installation of new burners, the utilization of a commercial technology for flue gas conditioning, etcetera [Espanol] Para disminuir los problemas ocacionados por el combustoleo en las calderas como: ensuciamientos anormales de las superficies de intercambio de calor, disminucion de eficiencias termicas y de combustion e incremento de las emisiones, se propone la utilizacion de la emulsion de agua en combustoleo. Se describe el proceso de esta tecnologia, se muestra su desarrollo y aplicacion en otros paises y se mencionan las experiencias a este respecto en el Instituto de Investigaciones Electricas (IIE), asi como las perspectivas que tiene esta tecnologia en Mexico. En conclusion, la emulsion de agua en combustoleo es una alternativa que puede ayudar a quemar eficientemente al combustoleo y asi contribuir a cumplir con los limites de emisiones que establecen normas ambientales. El desarrollo de esta tecnologia es economica y de aplicacion sencilla, comparada con otras como: la instalacion de nuevos quemadores, la utilizacion de una tecnologia comercial para acondicionar los gases de combustion, etcetera

  3. Developments in the technology for the combustion of water emulsions in Mexican fuel oil; Desarrollos en la tecnologia para la combustion de emulsiones agua en combustoleo mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Diego, Antonio Marin; Martinez Flores, Marco A.; Tamayo Flores, Gustavo; Alarcon Quiroz, Ernesto; Melendez Cervantes, Carlos [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    The residual petroleum oil (fuel oil) is the most used fuel in boilers of electrical and industrial power stations. Nevertheless, the use of this fuel can generate diverse problems such as the elevated particle emissions, that affect the boiler efficiency, darken the visibility by the smoke that leaves the chimneys and is emitted to the Environment. In addition, sulfur trioxide is produced, which reacts with the water present in the combustion gases, forming sulfuric acid that, when emitted, also affects the visibility of the plume and can be condensed, originating corrosion and increased accumulation of deposits in the boilers. The experimental research was made in a comparative base, between combustion tests of fuel oil, with emulsions where the water concentration and the size of the drops of this one was varied. A diagram of the supply of fuel and preparation of emulsions in a pilot furnace is shown. The article contains graphs of the effect of the water concentration of the emulsions in the particulate emission. The article contains figures of the cenospheres produced by the fuel oil combustion (500 x) and the ones produced by the combustion with 5% of water (500 x). Also shows graphs of the effect of the water drop size of emulsions in the particulate emission, of the reduction of the sulfur trioxide with soluble magnesium products in the water of emulsions, and of the free particle acidity with neutralizers of water emulsions of soluble magnesium. [Spanish] El aceite residual de petroleo (combustoleo) es el combustible mas utilizado en calderas de centrales electricas e industriales. Sin embargo, el uso de este combustible puede generar diverso problemas como las emisiones elevadas de particulas, que afectan la eficiencia de una caldera, obscurecen la visibilidad pero el humo que sale de las chimeneas y se emiten al medio ambiente. Ademas se produce trioxido de azufre, el cual reacciona con el vapor de agua presente en los gases de combustion, formado acido

  4. Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún

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    Ruiz-Márquez, D.

    2010-12-01

    Full Text Available This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the experimental results obtained, we may conclude that emulsion rheological properties are not significantly affected by the protein conservation method selected. On the contrary, an increase in homogenization speed favours an increase in the values of the linear viscoelastic functions. Less significant is the fact that as agitation speed increases further, mean droplet size steadily decreases.

    El presente trabajo se ha centrado en el desarrollo de emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún. Específicamente, se ha analizado la influencia del método de conservación de las proteínas aisladas (liofilización, congelación y de las condiciones de procesado seleccionadas sobre el comportamiento reológico y la microestructura de dichas emulsiones. Se han preparado emulsiones aceite en agua (con un contenido del 70% en peso de aceite estabilizadas con proteínas de atún. La concentración de emulsionante usada ha sido 0,50% en peso. El comportamiento reológico de estas emulsiones no depende significativamente del método de conservación de la proteína empleado. Por otra parte, un aumento de la velocidad de agitación durante el proceso de manufactura de la emulsión da lugar a una disminución continua del tamaño medio de gota y a un aumento de las funciones viscoelásticas dinámicas, menos significativo a medida que aumenta dicha velocidad de agitación.

  5. Aplicación de microondas en el tratamiento de emulsiones del tipo agua en aceite (w/o) y aceite en agua (o/w).

    OpenAIRE

    PÉREZ PÁEZ, ROCIO

    2011-01-01

    Las emulsiones del tipo agua en aceite (w/o) y aceite en agua (o/w) están compuestas por una mezcla de aceite, agua, lodo y otros agentes. Se pueden encontrar en el proceso y/o en los vertidos de diferentes tipos de industrias, tales como refinerías de petróleo, plantas procesadoras de aceite de consumo, industrias farmacéuticas, industrias de alimentos, etc. El calentamiento de un material a una frecuencia de microondas depende de la frecuencia de la onda electromagnética y de las propie...

  6. ESTUDIO DE SULFUROS DE MOLIBDENO GENERADOS MEDIANTE LA DESCOMPOSICIÓN TÉRMICA DE EMULSIONES AGUA/ACEITE

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    Ismael González

    2011-01-01

    Full Text Available Fueron preparados sólidos sulfurados tipo MoS2 mediante la descomposición térmica de emulsiones agua/aceite (W/O, incorporando en su fase acuosa heptamolibdato de amonio ((NH46Mo7O24.4H2O y un agente sulfurante, con el fin de evaluar fases activas que pudieran generarse en novedosos ca talizadores ultradispersos para conversión de hidrocarburos. Los sólidos fueron caracterizados por espectroscopia fotoelectrónica de rayos-x (XPS, oxidación a temperatura programada (TPO y análisis químico elemental. Los resultados de XPS revelaron que los sólidos presentan una superficie enriquecida en azufre, así como una significativa estabilidad a la oxidación por exposición al aire. Se comprobó que la cantidad de agente sulfurante presente originalmente en la emulsión es crucial para controlar la estequiometría de los sulfuros sintetizados. Los perfiles de oxidación permitieron diferenciar varios tipos de S y C, y muestran que ambos elementos tienden a oxidarse simultáneamente, sugiriendo que ambos elementos están íntimamente asociados en la estructura de estos materiales.

  7. Estudio reológico y microestructural de emulsiones concentradas de aceite de girasol en agua estabilizadas con proteínas agroalimentarias

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    Guerrero, A.

    2008-03-01

    Full Text Available Droplet Size Distribution (DSD and linear viscoelastic properties of concentrated o/w emulsions stabilized by different proteins (crayfish, gluten and soybean have been studied. A typical behaviour of highly concentrated emulsions with a high degree of flocculation has been found. An increase in energy input for the emulsification process or in emulsifier concentration leads to an increase in both viscoelastic moduli (G’, G’’ as well as to a decrease in droplet size. Thus, an enhancement of the entanglement network produced by association of protein molecules that are surrounding oil droplets or are present in the continuous phase takes place, leading to a significant improvement of emulsion stability.Se ha realizado un estudio de la distribución del tamaño de gotas y de las propiedades viscoelásticas lineales de emulsiones concentradas de aceite en agua, estabilizadas con diferentes proteínas (cangrejo, gluten y soja. Los sistemas estudiados siempre presentan un comportamiento típico de emulsiones altamente concentradas con un alto grado de floculación. Se ha observado que un incremento de la velocidad de agitación empleada durante la preparación o de la concentración de emulsionante dan lugar a un aumento de los módulos viscoelásticos (G’ y G’’ y a una disminución del tamaño de gotas. Por tanto se produce un reforzamiento del entramado formado por asociación de las gotas de fase dispersa y como consecuencia, un aumento en la estabilidad de las emulsiones.

  8. Fuel oil-water emulsions combustion and application perspectives in Mexico; Combustion de emulsiones de agua en combustoleo y perspectivas de aplicacion en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ocampo Barrera, Rene [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-09-01

    Fuel drops with a content of 16% by weight were burned in three emulsions prepared with 5%, 15% and 25% water. The combustion of the drops was carried out in an spherical furnace utilizing the technique of a drop suspended in a filament. The combustion process was registered by a high velocity video system. It was found that the surface of the particles produced by the combustion of the emulsions, had larger holes than the ones of the fuel, therefore it is expected that emulsifying the fuel can help in reducing the unburned particles emission. [Espanol] Se quemaron gotas de un combustoleo, con un contenido de asfaltenos del 16% en peso, y de tres emulsiones preparadas con 5%, 15% y 25% de agua. La combustion de las gotas se llevo a cabo en un horno esferico empleando la tecnica de gota suspendida en un filamento. El proceso de combustion se registro mediante un sistema de video de alta velocidad. Se encontro que la superficie de las particulas de coque, producidas por la combustion de emulsiones, tuvo hoyos mas grandes que la del combustoleo, por lo que es de esperarse que emulsionar el combustoleo puede ayudar a reducir las emisiones de particulas inquemadas.

  9. Evolución de las propiedades reológicas de emulsiones aceite vegetal en agua durante el proceso de emulsificación y almacenamiento

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    Gallegos, C.

    2000-08-01

    Full Text Available This paper deals with the evolution of the rheological properties and droplet size distributions (DSD of oil-in-water emulsions, stabilized by non-ionic surfactant, with time. The emulsification process has been followed by the evolution of the torque with the emulsification time and follows a first-order kinetic equation. From the experimental results obtained it is apparent that the rheology and DSD of the emulsions studied depends on the emulsification time and temperature of emulsification, as well as, the agitation speed. An increase in the emulsification time, at 15ºC, yields lower values of the mean droplet size and, subsequently, an increase in the linear viscoelasticity functions of the emulsions. However, above 25ºC, the emulsification process may be modified because a higher degree of coalescence may take place at long emulsification time. A «depletion-flocculation» mechanism due to the presence of surfactant, in form of micelles, in the continuous phase of the emulsions.Se estudia la evolución de las propiedades reológicas y de la distribución de tamaños de las gotas (DTG de emulsiones aceite vegetal en agua, estabilizadas con un tensioactivo no iónico, durante los períodos de emulsificación y de almacenamiento. La cinética del proceso de emulsificación se ha seguido a través de la variación del par de torsión con el tiempo de emulsificación, ajustándose a una ecuación de primer orden. De los resultados obtenidos puede deducirse que la evolución de las características reológicas y de DTG de las emulsiones estudiadas depende principalmente del tiempo y temperatura de emulsificación y de la velocidad de agitación. A 15ºC, un aumento del tiempo de emulsificación produce una disminución del diámetro medio de gota y, por tanto, un aumento de las funciones viscoelásticas lineales. Sin embargo, a temperaturas superiores a 25ºC el proceso es mucho más complejo, pudiendo favorecerse el proceso de

  10. Influencia de la relación proteína de altramuz/tensioactivo en las propiedades de flujo y texturales de emulsiones aceite en agua

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    Franco, J. Mª.

    2001-08-01

    Full Text Available The influence of different surfactant/lupin protein ratio on the shear-flow and texture properties of oil-in-water emulsions was investigated in this work in order to find a synergistic effect between both types of emulsifiers. With this aim, texture, steady-shear flow and droplet size measurements were carried out. Different surfactants (Tween 20 and three sucrose esters showing different phase behaviour in water solution were studied. From the experimental results it can be concluded that emulsions stabilised by mixtures of both, low- and high-molecular-weight emulsifiers, show lower values of steady-state viscosity and textural parameters than those found when lupin protein was the only emulsifier used, in spite of a higher average droplet size. The evolution of emulsion textural and flow parameters with the composition of the mixture used as emulsifier can be explained on the basis of the phase behaviour of the low-molecular-weight emulsifier, modifications on the composition at the interface and hydrophobic interactions between both type of emulsifiers.En el presente trabajo se ha estudiado la influencia que ejerce la proporción proteína de altramuz/emulsionante de bajo peso molecular en el comportamiento viscoso y en las propiedades texturales de emulsiones alimentarias aceite en agua con el fin de investigar un posible efecto sinérgico entre ambos tipos de emulsionantes. Con este propósito, se efectuaron medidas de tamaño de gota, flujo viscoso y propiedades texturales en emulsiones estabilizadas por proteína de altramuz y tensioactivos de diferente HLB (Tween 20 y tres estearatos de sacarosa. De los resultados experimentales, se concluye que las emulsiones estabilizadas por ambos tipos de emulsionantes muestran valores de la viscosidad en estado estacionario y de las propiedades texturales estudiadas inferiores a los encontrados en la emulsión estabilizada únicamente con proteína de altramuz, a pesar de poseer esta última un

  11. PROPIEDADES REOLÓGICAS DE EMULSIONES DE PETRÓLEO PESADO EN AGUA REOLOGICAL PROPERTIES OF EMULSIONS OF PETROLEUM WEIGHED IN WATER

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    Héctor Laurencio Alfonso

    2008-06-01

    Full Text Available El propósito de esta investigación fue determinar la influencia que ejerce la variación de temperatura de 15, 25 y 35 0C sobe las propiedades reológicas de las emulsiones de petróleo pesado en agua. Se estudio una mezcla formada por 70 % de petróleo de 15 º API, 29 % de agua y 1 % de tensoactivo. A partir del estudio reológico se da el comportamiento de la viscosidad aparente con relación al gradiente de velocidad para diferentes temperaturas. Se observa que la emulsión presenta propiedades seudoplásticas; la presencia de la variación de temperatura no provoco variaciones en el índice de flujo, no siendo así con la viscosidad aparente y el índice de consistencia, que disminuyen con el aumento de la temperatura, lo que se corrobora con estudios de otros autores.The purpose of this investigation was to determine the influence of temperature variations on the reological properties of the emulsions of heavy oil in water. It was studied a mixture formed by 70% of petroleum of 15 or API, 29% of water and 1 tensoactivo%. Starting from the reologic study the behavior of the apparent viscosity is given with relationship to the shear rate for different temperatures. It is observed that the emulsion presents properties seudoplastic; not being i this variation of temperature doesn't cause variations in the index of flow, way with the apparent viscosity and the index of consistency that diminish with the increase of the temperature, what is corroborated with other authors studies.

  12. Influencia de las concentraciones de aceite y emulsionante en las propiedades reológicas de emulsiones aceite en agua del tipo salsa fina

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    Franco, José María

    1995-04-01

    Full Text Available The viscous and viscoelastic behaviour of food emulsions containing a mixture of egg yolk and sucrose stearate as a function of oil and sucrose stearate concentrations were studied. Oil concentrations ranged between 40- 55% w/w for emulsions containing 5% w/w sucrose stearate and sucrose ester concentrations varied between 0-10% w/w for emulsions containing 50% w/w oil. steady flow, linear oscillatory shear tests and droplet size distribution measurements were carried out. An increase in oil or emulsifier concentration produced an increase in both the steady-state viscosity and in the viscoelastic functions. The results have been explained on the basis of the relationship between the structural parameters and the rheology of the emulsions studied.

    Se ha estudiado la influencia que ejercen las concentraciones de aceite y emulsionante sobre el comportamiento viscoso y viscoelástico de emulsiones alimentarias con bajo contenido en aceite estabilizadas por una mezcla de yema de huevo y estearato de sacarosa. Se han preparado emulsiones variando la concentración de aceite entre el 40 y el 55% p/p en emulsiones con un 5% p/p en sucroéster y la concentración de sucroéster entre el 0 y el 10% p/p manteniendo un 50% p/p en aceite. Se han realizado medidas reológicas en cizalla oscilatoria dentro del intervalo de viscoelasticidad lineal, representativas de un estado imperturbado, y medidas en cizalla estacionaria, que causan una gran destrucción estructural. También se han determinado las distribuciones de tamaños de gota. Un aumento en el contenido de aceite o emulsionante produce un aumento de las funciones viscoelásticas dinámicas y de la viscosidad estacionaria. Estos resultados se explican en función de los parámetros estructurales de las emulsiones.

  13. Avances en la formulación de emulsiones

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    Zapata, Isabel

    2007-03-01

    Full Text Available This review emphasizes that formulation, along with processing, defines the microstructure of emulsions and therefore their functional properties. Possible components of both the oil and aqueous phases are described as well as their relevant properties concerning emulsions. The general characteristics of low molecular and high molecular weight emulsifiers, which essentially are adsorbed on the oil/water interfaces, are described. Synthetic emulsifiers derived from the oil industry, as well as those stemming from edible raw materials and biotechnological sources are considered. The main steps of the emulsifying mechanism using proteins and the role of synthetic polymers as well as polysaccharides as stabilizers are discussed. In addition, the formation of protein-polysaccharide complexes as a way of optimizing emulsion formulations is analyzed. Finally, this review points out that the progress in emulsion formulation must rely on the product engineering approach, which involves a multidisciplinary methodology.Esta revisión destaca que la formulación, junto con el procesado, definen la microestructura de las emulsiones, y por tanto sus propiedades funcionales. Se describen los componentes de las fases oleosa y acuosa, así como sus principales propiedades en relación con las emulsiones. Se estudian los emulsionantes, que ocupan básicamente la interfase aceite-agua, distinguiendo entre los de bajo y alto peso molecular, así como entre sintéticos derivados del petróleo, otros que se pueden obtener a partir de materias primas comestibles y de origen biotecnológico. Se resumen las etapas claves que sufren las proteínas como emulsionantes y las condiciones en que polímeros sintéticos y polisacáridos actúan cono estabilizantes. Se aborda también la formación de complejos proteína-polisacáridos como una vía de optimización de formulaciones. Se finaliza destacando que los progresos en formulación de emulsiones deben basarse en la

  14. Uso combinado de 1-Meticiclopropeno y emulsiones de cera en la conservación de guanábana (Annona muricata)

    OpenAIRE

    González,Efigenia Montalvo; Fernández,Andres Eloy León; Paez,Hernani Rea; Oca,Miguel Mata Montes de; Gómez,Beatriz Tovar

    2014-01-01

    El objetivo de este trabajo fue evaluar la combinación del 1-metilciclopropeno (1-MCP) y emulsiones de cera sobre la conservación de guanábana. Las condiciones de almacenamiento fueron: 25 ºC y 16 ºC, frutos con emulsiones a base de cera de candelilla o cera de abeja diluídas con agua (10:90 v/v y 15:85 v/v) almacenados a 16 ºC, frutos tratados con 1-MCP (1500 nL L-1, 12 h). En los frutos a 16 ºC con y sin emulsiones se observó daño por frío y no maduraron. En los frutos con la aplicación de ...

  15. Estabilidad a la congelación descongelación de emulsiones o/w preparadas con aislados de soja nativos y desnaturalizados con diferente solubilidad

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    Gonzalo Palazolo

    2011-05-01

    Full Text Available En este trabajo se evaluó la estabilidad a la congelación de emulsiones modelo aceite en agua (o/w preparadas con cuatro aislados de soja: dos nativos (ASN-1 y ASN-2, de similar composición pero diferente solubilidad, >90% y ~75%, respectivamente y dos desnaturalizados (ASD-1 y ASD-2, resultantes de calentar los respectivos aislados nativos (90 ‹C, 5 minutos. Las emulsiones preparadas con dispersiones acuosas al 2% p/v de ASN o ASD y aceite de girasol refinado (ƒ³ =0,25, se congelaron a -20 ‹C por 24 horas y luego se descongelaron a 20 ‹C. La estabilidad se evaluo a partir de medidas de distribución de tamano de partícula (difraccion laser y aceite liberado (AL, metodo de dilucion del colorante. Las emulsiones preparadas con ASN-2 y ASD-2 resultaron muy inestables despues de ser congeladas y descongeladas, resultadoque se evidenció por el aumento del tamano de partícula y un AL>25%. Al usar el aislado ASN-1 de mayor solubilidad, las emulsiones fueron mas estables y se observó un marcado incremento de la estabilidad cuando sus proteínas eran desnaturalizadas (ASD-1, no observándose prácticamente coalescencia ni aceite separado. En conclusión, la solubilidad y la desnaturalización proteíca de los aislados de soja son factores decisivos en la estabilidad de emulsiones frente a la congelación-descongelación.

  16. Redes de ruido en emulsiones holográficas

    OpenAIRE

    Beléndez Vázquez, Augusto; Carretero López, Luis; Fimia Gil, Antonio; Fuentes Rosillo, Rosa; Pascual Villalobos, Inmaculada

    1992-01-01

    Se estudian las redes de ruido holográficas registradas en emulsiones fotográficas blanquadas haciendo uso de un único haz de registro. Asimismo se analizan y discuten los resultados experimentales obtenidos con procesados típicos de las emulsiones blanqueadas, como son los blanqueos solvente y de rehalogenación, cuando se analiza la transmitancia de las placas holográficas en función del ángulo de reconstrucción. Holographic noise gratings recorded in bleached silver halide emulsions with...

  17. Encapsulación de quercetina en nano y micro-emulsiones alimenticias

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    María Paz Xavier

    2011-12-01

    Full Text Available El objetivo de este estudio fue desarrollar, caracterizar y comparar nano y microemulsiones estables incorporando quercetina como compuesto bioactivo. Se estudiaron emulsiones aceite:agua con beta-lactoglobulina, utilizando dos procesos de elaboración: homogeneizador de alta velocidad (Ultra-turrax y homogeneizador de alta presión (HPH, Emulsiflex-C5, 500-1200bar. Se evaluó la variación en la concentración de emulsionante, fracción volumétrica de aceite e incorporación de hidrocoloides. La formación y la estabilidad de las emulsiones se analizaron por su perfil de tamaño de gota (Malvern-Zetasizer Nano ZS y constantes cinéticas de desestabilización obtenidas a partir del estudio de la retro dispersión de la luz en el tiempo (Turbiscan-Classic. Se determinó que utilizando el Ultra-turrax se logra formar nanoemulsiones con mayor estabilidad a una concentración de 2.2 % (m/v de proteína y 0.2 % (m/v de goma guar, mientras que utilizando HPH con una concentración de 1.5 % (m/v de beta-lactoglobulina y sin necesidad de hidrocoloides se logra una emulsión de adecuado tamaño de gota (d<500nm y mayor estabilidad (α<0.05. Las nanoemulsiones elaboradas con HPH presentaron mayor porcentaje de encapsulación de quercetina.

  18. Emulsiones múltiples; compuestos bioactivos y alimentos funcionales

    OpenAIRE

    Jiménez Colmenero, Francisco

    2013-01-01

    La continua aparición de evidencias científicas acerca del papel de la dieta y/o sus componentes en el bienestar y la salud, ha favorecido la aparición de los alimentos funcionales que en la actualidad constituyen uno de los principales impulsores del desarrollo de nuevos productos. La aplicación de emulsiones múltiples abre nuevas posibilidades en el diseño y desarrollo de alimentos funcionales. Tales sistemas pueden emplearse como producto intermedio (ingrediente alimentario) dentro de las ...

  19. EVALUACIÓN DE LA ACTIVIDAD ANTIOXIDANTE DE ACEITES ESENCIALES EN EMULSIONES DEGRADADAS POR RADIACIÓN ULTRAVIOLETA

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    Geovanna Tafur

    2008-03-01

    Full Text Available En este trabajo se evaluaron las actividades antioxidantes in vitro de los aceites esenciales de Origanum vulgare L., Rosmarinusofficinalis L. y Coriandrum sativum L., en emulsiones de agua en aceite (Ag/Ac y aceite en agua (Ac/Ag, sometidas al deterioro oxidativo por medio de la radiación ultravioleta A-visible (UVAVIS.En la emulsión de Ag/Ac (margarina, el aceite esencial de orégano presentó actividad antioxidante superior a la del cilantro y el romero, e incluso a la de la vitamina E, en concentraciones de 1, 10 y 20 g/kg. Se estableció además, que la acción antioxidante in vitro de los aceitesesenciales de orégano y cilantro aumentaba con su concentración en la margarina.Por último, el aceite esencial de orégano presentó una acción protectora más baja en la emulsión de Ac/Ag.

  20. Modelación energética y operacional del sistema de agua de alimentar caldera de una central termoeléctrica; Modeling energetic and operational of the boiler feed water system of a power plant

    Directory of Open Access Journals (Sweden)

    Ernesto Miguel Solís Alemán

    2015-09-01

    Full Text Available Se propone un modelo combinado basado en la implementación paralela de dos aproximadores funcionales, utilizando una red neuronal del tipo (MLP y una regresión estadística, para la obtención de las características energéticas y de operación actual del Sistema de Agua de Alimentar Caldera (SAAC en una Central Termoeléctrica (CTE, en la cual se regula el flujo de agua a la caldera por variación de velocidad. La respuesta del modelo combinado se obtiene a partir de la suma ponderada de cada aproximador funcional. Dicho modelo es utilizado para relacionar el consumo de corriente y la posición del variador de velocidad, en función de la presión de descarga y el flujo entregado por cada bomba del SAAC. Para el ajuste de los modelos se utilizan mediciones almacenadas en el archivo histórico del sistema SCADA, donde se aplica un método de procesamiento de datos para eliminar ruidos que pueden afectar el ajuste de los modelos propuestos.Is proposed a combined model based on the parallel implementation of two functional approximators, using a neural network of the type (MLP and a statistical regression to obtain the actual energetic and operation characteristics of the Boiler Feed Water System (BFWS in a Power Plant, in which the water flow to the boiler is controlled by variation speed. The response of the combined model is obtained from the weighted sum of each functional approximator. This model is used to relate the current consumption and the position of the speed variator, in function of the discharge pressure and flow delivered by each pump of the BFWS. For the fit of the models is used save measurements of the historical file of the SCADA system, where is applied a data processing method to eliminating noise that can affect the fit of the models proposed.

  1. Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún

    OpenAIRE

    Ruiz Márquez, Dolores; Partal López, Pedro; Franco Gómez, José María; Gallegos Montes, Críspulo

    2010-01-01

    This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization) on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the e...

  2. Agua(s) remisión de V. nivelador de (las) agua(s).

    OpenAIRE

    2011-01-01

    [ES] Definición del término Agua(s) remisión de V. nivelador de (las) agua(s). en el diccionario Dicter. [EN] Definition of the word Agua(s) remisión de V. nivelador de (las) agua(s). in the dictionary Dicter.

  3. Estabilidad de emulsiones preparadas con proteínas de sueros de soja

    Directory of Open Access Journals (Sweden)

    Jorge Wagner

    2011-12-01

    Full Text Available Por precipitación con acetona en frio, se obtuvieron muestras de proteínas aisladas de dos sueros de soja, el suero SS proveniente de la obtención de aislados de soja y el suero de tofu ST. A partir del SS y del mismo suero previamente liofilizado y calentado (SSLC se obtuvieron las proteínas denominadas PSS y PSSLC, respectivamente; a partir de ST se preparó la muestra PST. El objetivo del trabajo fue analizar la estabilidad de emulsiones o/w preparadas con las proteínas de sueros de soja en forma comparativa con un aislado de soja nativo (ASN. Las emulsiones se prepararon por homogeneización de dispersiones proteicas (0,1–1,0 % p/v en buffer fosfato 10 mM pH 7 y aceite de girasol (Φmásico=0,33, empleando un Ultraturrax T-25. La estabilidad fue evaluada por medida del aceite separado, distribución de tamaño de partículas (por difracción láser y los grados de cremado y coalescencia evaluados a través de perfiles de BackScattering. Se observó que en todas las concentraciones ensayadas las emulsiones preparadas con proteínas aisladas (por precipitación con acetona en frío de suero de tofu tratado térmicamente (PST tenían una estabilidad comparable a la de emulsiones preparadas con ASN. Se halló una estabilidad menor en emulsiones con proteínas nativas de suero de soja (PSS obtenido en laboratorio no tratado térmicamente. Las proteínas obtenidas de este suero liofilizado y calentado (PSSLC exhibieron una mejor capacidad emulsionante. Los resultados mostraron que las proteínas de sueros de soja presentan buenas propiedades emulsionantes y estabilizantes dependientes del grado de desnaturalización y glicosilación alcanzado.

  4. La electrocoagulación, una alternativa al proceso convencional de coagulación de aguas residuales

    OpenAIRE

    Cañizares, Pablo; Martínez, Fabiola; Sáez, Cristina; Rodrigo, Manuel

    2009-01-01

    El tratamiento de residuos consistentes en dispersiones acuosas coloidales, o en emulsiones de aceite en agua, se suele realizar mediante la adición de reactivos al residuo, normalmente disoluciones que contienen sales de hierro y aluminio. Una alternativa a la dosificación de estas disoluciones es la generación por vía electroquímica de los iones necesarios para desestabilizar los coloides de la dispersión, o las microgotas de la emulsión, mediante la utilización de planchas de hierro o alum...

  5. HR boiler

    Energy Technology Data Exchange (ETDEWEB)

    1982-08-01

    A number of manufacturers of central heating boilers in the Netherlands have produced high-efficiency boilers, all carrying the GIVEG-HR seal of approval (GIVEG is the manufacturers' association in the Netherlands, and HR stands for 'hoog rendement': high efficiency). Efficiences were considerably improved by reducing flue, idling and radiation losses. Control and safety, discharges of flue gases and condensate need special attention. Whether installation of a GIVEG-HR boiler is profitable in view of the cost/profit ratio, will have to be determined from case to case. N.V. Nederlandse Gasunie felt it was time to present the facts so far in a way specially aimed at the construction industry. This special edition of 'Gas and Architecture' answers a number of questions which the architect or consultant engineer might have in particular before advising on the installation of the new boiler in houses and other buildings in the interests of energy saving. A technical description of the HR boiler covers the backgrounds of its development and considers the role of the Netherlands government as regards to the introduction of the boiler.

  6. Efficient boiler operations sourcebook

    Energy Technology Data Exchange (ETDEWEB)

    Payne, F.W. (comp.)

    1985-01-01

    This book emphasizes the practical aspects of industrial and commercial boiler operations. It starts with a comprehensive review of general combustion and boiler fundamentals and then deals with specific efficiency improvement methods, and the cost savings which result. The book has the following chapter headings: boiler combustion fundamentals; boiler efficiency goals; major factors controlling boiler efficiency; boiler efficiency calculations; heat loss; graphical solutions; preparation for boiler testing; boiler test procedures; efficiency-related boiler maintenance procedures; boiler tune-up; boiler operational modifications; effect of water side and gas side scale deposits; load management; auxillary equipment to increase boiler efficiency; air preheaters and economizers; other types of auxillary equipment; combustion control systems and instrumentation; boiler O/sub 2/ trim controls; should you purchase a new boiler.; financial evaluation procedures; case studies. The last chapter includes a case study of a boiler burning pulverized coal and a case study of stoker-fired coal.

  7. agua potable

    Directory of Open Access Journals (Sweden)

    John Fredy Rios

    2008-01-01

    Full Text Available Los sistemas de distribución pueden afectar la calidad del agua potable debido a las condiciones de la tubería y a la operación del sistema. Algunos parámetros son sensibles a la variación durante la distribución como: el cloro residual, pH, color y turbiedad, debido a que el material de la tubería puede presentar deterioro en estos sistemas a causa de la corrosividad del agua. Los diversos estudios realizados sobre el tema han empleado tanto sistemas reales como dispositivos de laboratorio para la realización de los ensayos. Entre los dispositivos más empleados actualmente, se reporta el uso del sistema piloto de distribución por las ventajas que ofrece y su flexibilidad en el diseño. Para definir las características de diseño de un sistema piloto de distribución se hizo una revisión de la literatura. El sistema se empleará en el estudio de la interacción entre el líquido y la pared de tubería. Se utilizarán materiales metálicos usados en sistemas de distribución secundarios, con el fin de determinar el ataque a la superficie interna de las tuberías y las causas de formación de depósitos sobre ellas, así como identificar los efectos de esta interacción en la calidad del agua.

  8. Reología de emulsiones estabilizadas por biopolímeros

    Directory of Open Access Journals (Sweden)

    Madiedo, J. M.

    1997-12-01

    Full Text Available In this work, the viscous and viscoelastic responses of food emulsions stabilized by proteins are studied. The damping function determined from the relaxation modulus, together with the relaxation spectrum calculated from the dynamic modulus, allowed a prediction of the material response under steady-state conditions by applying the Wagner model. On the other hand, the study of the evolution of the microstructure of these systems under shear allows to explain the behavior observed in steady-flow tests, as well as the lack of concordance between experimental an predicted values.

    En este trabajo se estudian las respuestas viscosa y viscoelástica de emulsiones alimentarias estabilizadas por proteínas. La función de amortiguación determinada desde el módulo de relajación ha permitido, junto con el espectro de relajación calculado a partir de los módulos dinámicos, predecir la respuesta del material en condiciones de cizalla estacionaria mediante la aplicación del modelo de Wagner. Por otra parte, el estudio de la evolución de la microestructura de estos sistemas con la cizalla permite explicar el comportamiento observado en ensayos de flujo estacionario, así como la falta de concordancia entre los resultados experimentales y los predichos.

  9. Influencia del pH en la estabilidad de emulsiones elaboradas con proteínas de salvado de arroz

    Directory of Open Access Journals (Sweden)

    Laura Maldonado

    2011-12-01

    Full Text Available Si bien las proteínas de origen animal en muchas instancias pueden tener mejores características funcionales que las proteínas de origen vegetal, el incremento de su costo puede favorecer al uso expansivo de las fitoproteínas como reemplazo. Una de las fuentes de proteínas de origen vegetal es el salvado de arroz, que se obtiene como subproducto en el proceso de pulido del arroz integral (Oryza santiva L para producir el arroz blanco. Se estudió los procesos de cremado, floculación y coalescencia de emulsiones preparadas con proteínas del salvado de arroz a pH 6,0 y 8,0. La obtención de las proteínas del salvado de arroz se realizó en un medio alcalino, partiendo de salvado de arroz desengrasado. El proceso de desestabilización de las emulsiones se analizó a partir de los datos obtenidos por el método de retrodispersión de luz mediante un equipo Turbiscan 2000; en el caso del cremado los datos fueron ajustados a una cinética bifásica con una componente de segundo orden (hiperbólica y otra con un comportamiento sigmoidal. Las emulsiones preparadas a pH 8 presentaron una mayor estabilidad frente al cremado, mientras que los procesos de floculación y coalescencia no fueron influenciados por los distintos valores de pH.

  10. Boilers, evaporators, and condensers

    International Nuclear Information System (INIS)

    Kakac, S.

    1991-01-01

    This book reports on the boilers, evaporators and condensers that are used in power plants including nuclear power plants. Topics included are forced convection for single-phase side heat exchangers, heat exchanger fouling, industrial heat exchanger design, fossil-fuel-fired boilers, once through boilers, thermodynamic designs of fossil fuel-first boilers, evaporators and condensers in refrigeration and air conditioning systems (with respect to reducing CFC's) and nuclear steam generators

  11. Agua y salud humana

    OpenAIRE

    Cordoba, María Alejandra; Del Coco, Valeria; Basualdo Farjat, Juan A.

    2010-01-01

    La protección de la salud pública requiere agua de bebida segura. La realización de frecuentes exámenes para determinar si el agua contiene organismos indicadores sigue siendo el modo más sensible y especifico de estimar la calidad del agua desde el punto de vista de la higiene. En los países donde existe un sistema de vigilancia integrado, la mayoría de los brotes de origen hídrico han sido vinculados a fallas en el tratamiento, inclusión de agua contaminada en la red o a problemas...

  12. New technology for the emulsification of petroleum residuals in water; Nueva tecnologia para la emulsificacion de residuales del petroleo en agua

    Energy Technology Data Exchange (ETDEWEB)

    Peralta, M. Vita; Arriola, Alejandro M.; Sanchez S, Ramon; Manzanares P, Emilio; Romo M, Cesar A.; Yery de Coss P, R. [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    emulsiones son principalmente la relacion de sus componentes, viscosidad, tamano y distribucion de gota y su estabilidad. Los trabajos experimentales se iniciaron produciendo emulsiones en forma de lotes, utilizando muestras de aproximadamente 500 ml de residuo de vacio. En esta primera etapa se examinaron, a diferentes concentraciones, ocho surfactantes distintos, al igual que combinaciones entre ellos, tambien se utilizaron siete diferentes estabilizadores. Como estas pruebas se han logrado identificar las concentraciones, asi como las relaciones mas adecuadas de surfactante y estabilizador para la produccion de emulsiones de residuo de vacio-en agua. El tamano y distribucion de gota se ha determinado mediante un microscopio optico LEICA, modelo DMLS, que tiene acoplado un sistema fotografico en el que se obtiene una foto de emulsion y, posteriormente, se utiliza un sistema de analisis de imagenes para la obtencion de los valores de diametro de las gotas presentes en la emulsion. Finalmente, mediante un software estadistico se obtiene el tamano promedio de la particulas, asi como la distribucion del tamano de las gotas. Se muestran los resultados de pruebas emulsiones que permanecen fluidas y se dan un ejemplo de la microestructura de una emulsion de residuo de vacio-en-agua. Asi como un ejemplo de histograma de la distribucion de tamano de gota de una emulsion de residuo de vacio-en-agua. Se muestran graficas de la viscosidad en funcion del esfuerzo de corte a diferentes temperaturas de una emulsion de residuo de vacio-en-agua y otra de la viscosidad en funcion de la temperatura a diferentes esfuerzos de corte de una emulsion de residuo de vacio-en-agua.

  13. Boiler water regime

    Science.gov (United States)

    Khavanov, Pavel; Chulenyov, Anatoly

    2017-10-01

    Active development of autonomous heating the past 25 years has led to the widespread use of hot-water boilers of small capacity up to 2.5 MW. Rational use of the design of autonomous sources of heating boilers design features significantly improve their technical, economic and operational performance. This publication reviewed and analyzed a number of features of the design, operation and exploitation of boilers of small capacity, significantly affecting the efficiency and reliability of their application.

  14. Boiler conversions for biomass

    Energy Technology Data Exchange (ETDEWEB)

    Kinni, J [Tampella Power Inc., Tampere (Finland)

    1997-12-31

    Boiler conversions from grate- and oil-fired boilers to bubbling fluidized bed combustion have been most common in pulp and paper industry. Water treatment sludge combustion, need for additional capacity and tightened emission limits have been the driving forces for the conversion. To accomplish a boiler conversion for biofuel, the lower part of the boiler is replaced with a fluidized bed bottom and new fuel, ash and air systems are added. The Imatran Voima Rauhalahti pulverized-peat-fired boiler was converted to bubbling fluidized bed firing in 1993. In the conversion the boiler capacity was increased by 10 % to 295 MWth and NO{sub x} emissions dropped. In the Kymmene Kuusankoski boiler, the reason for conversion was the combustion of high chlorine content biosludge. The emissions have been under general European limits. During the next years, the emission limits will tighten and the boilers will be designed for most complete combustion and compounds, which can be removed from flue gases, will be taken care of after the boiler. (orig.) 3 refs.

  15. Boiler conversions for biomass

    Energy Technology Data Exchange (ETDEWEB)

    Kinni, J. [Tampella Power Inc., Tampere (Finland)

    1996-12-31

    Boiler conversions from grate- and oil-fired boilers to bubbling fluidized bed combustion have been most common in pulp and paper industry. Water treatment sludge combustion, need for additional capacity and tightened emission limits have been the driving forces for the conversion. To accomplish a boiler conversion for biofuel, the lower part of the boiler is replaced with a fluidized bed bottom and new fuel, ash and air systems are added. The Imatran Voima Rauhalahti pulverized-peat-fired boiler was converted to bubbling fluidized bed firing in 1993. In the conversion the boiler capacity was increased by 10 % to 295 MWth and NO{sub x} emissions dropped. In the Kymmene Kuusankoski boiler, the reason for conversion was the combustion of high chlorine content biosludge. The emissions have been under general European limits. During the next years, the emission limits will tighten and the boilers will be designed for most complete combustion and compounds, which can be removed from flue gases, will be taken care of after the boiler. (orig.) 3 refs.

  16. Electric utility CFB boilers

    International Nuclear Information System (INIS)

    Fairbanks, D.A.

    1991-01-01

    This paper reports on Circulating Fluidized Bed (CFB) boiler technology which caught the attention of boiler users: first for its technical advantages of reduced air emissions and low grade fuel tolerance, then later for its problems in becoming a reliable process. Refractory longevity and fuel feed reliability plagued a number of new installations. The efficacy of CFB technology is now more assured with the recent success of Texas-New Mexico Power Company's 160 MWe CFB based units, the world's largest operating CFB boilers. Most of the more notable CFB development problems have been successfully addressed by these units. The TNP units have demonstrated that CFB's can reliable produce high capacity factors at low emission rates using a fuel that has traditionally hampered the operation of pulverized coal (PC) boilers and without the attendant problems associated with sulfur scrubbers required by PC boilers

  17. Preparation of stable tea seed oil nano-particle emulsions by a low energy method with non-ionic surfactants; Preparación de emulsiones estables de nanopartículas de aceite de semilla de té mediante un método de baja energía con tensioactivos no iónicos

    Energy Technology Data Exchange (ETDEWEB)

    Kanlayavattanakul, M.; Lourith, N.

    2017-07-01

    Tea seed oil nano-particle emulsions were prepared. Non-ionic surfactants containing Tween 80 and Span 80 (1:1, w/w) were mixed with propanol (3-9:1, w/w) to give Smix, which was thereafter mixed with tea seed oil. The mixture was titrated with water at 150 rpm to give clear or bluish and bluish-white emulsions. Twelve nano-particle emulsions with 64.64 to 72.73% Smix, 16.66 to 27.27% oil and 9.09 to 16.67% water with particle sizes between 207.00 to 430.10 nm, PDI of 0 to 0.4, ζ-potential of -42.00 to -49.63 mV, pH of 7.04 to 7.32 and 151.33 to 241.93 cps, were stable following an accelerated stability test and long term storage at room temperature and 4 and 45 ºC for 90 days, although one system (16.66% oil and 66.67% Smix) was separated. This nano-particle emulsion formulation is concise and feasible for an industrial development of topical products containing tea seed oil. [Spanish] Se prepararon emulsiones de nanopartículas de aceite de semilla de té. Se mezclaron tensioactivos no iónicos que contenían Tween 80 y Span 80 (1:1, p/p) con propanol (3-9: 1, p/p) para dar Smix que después se mezcló con aceite de semilla de té. La mezcla se valoró con agua a 150 rpm para dar emulsiones claras o azuladas y blanco azulado. Doce emulsiones de nanopartículas con 64,64 a 72,73% de Smix, 16,66 a 27,27% de aceite y 9,09 a 16,67% de agua con tamaños de partícula entre 207,00 y 430,10 nm, PDI de 0 a 0,4, potencial ζ de -42,00 a -49,63 mV, PH de 7,04 a 7,32 y 151,33 a 241,93 cps, se mantuvieron estables tras el ensayo de estabilidad acelerada y almacenamiento a largo plazo a temperatura ambiente y 4 y 45 ºC durante 90 días, aunque uno de los sistemas (16,66% de aceite y 66,67% de Smix) se desvió. Esta formulación de emulsión de nanopartículas es concisa y factible para un desarrollo industrial de productos tópicos que contienen aceite de semilla de té.

  18. CECIL lances Bruce's boilers

    International Nuclear Information System (INIS)

    Malaugh, J.; Monaghan, D.

    1994-01-01

    Over the past few years Ontario Hydro has become increasingly concerned about accumulations of sludge in its nuclear plant boilers, so a comprehensive sludge management programme has been instituted to combat build-up. This included developing the tele-operated robot CECIL (Consolidated Edison Combined Inspection and Lancing) equipment, originally designed for work in PWRs, for CANDU boilers. This required a significantly reconfigured robotic system as well as modifications to the boilers themselves. Work on the Bruce A reactor is described. (4 figures). (author)

  19. Emulsiones tipo crema preparadas a base de leche de soja 1: Estudios de estabilidad y determinación de las formulaciones

    Directory of Open Access Journals (Sweden)

    Palazolo, Gonzalo G.

    2005-03-01

    Full Text Available The objective of the present work was to obtain stable emulsions prepared with soy milk, refined sunflower oil and milk fat. By Quick Scan measures, emulsions formulated with soy milk (5 and 10 %, variable proportion and composition of lipid phase and absence or presence of xhantan gum, more stable formulations were determined. Creaming was the main mechanism of destabilization of the emulsions. Those formulated with more concentrated soy milk, greater content of lipid phase and presence of xhantan gum were more stable. The stability increase of emulsions with a higher content of oil was attributed to the increase of viscosity instead of the droplet size. The content of milk fat in lipid phase had a low influence on droplet size but didn't show changes in droplet distribution and emulsion stability. Consistency increase due to stirring was favoured in emulsions of 40-50 % of lipid phase (30-50 % of milk fat.Se evaluó la obtención de cremas líquidas estables compuestas por leche de soja en polvo, aceite de girasol refinado y grasa láctea. Por medidas de estabilidad (QuickScan de emulsiones O/W con 5 % y 10 % de leche de soja, diferente cantidad y composición de fase lipídica y ausencia o presencia de goma xántica, se determinaron las formulaciones más estables. En las emulsiones inestables, el proceso predominante de desestabilización fue la separación gravitacional. Las emulsiones más estables fueron las preparadas con goma xántica, 10 % de leche de soja y mayor contenido de fase lipídica. El aumento de la estabilidad en las emulsiones con mayor contenido de aceite no se atribuyó al tamaño de gota sino a un aumento de la viscosidad. La variación del contenido de grasa láctea (a igual concentración de leche de soja y proporción de fase lipídica influyó levemente en el tamaño de gota pero no en su distribución ni en la estabilidad. De las emulsiones preparadas, sólo aquellas con un alto porcentaje de fase lipídica (40

  20. ENERGY STAR Certified Boilers

    Data.gov (United States)

    U.S. Environmental Protection Agency — Certified models meet all ENERGY STAR requirements as listed in the Version 3.0 ENERGY STAR Program Requirements for Boilers that are effective as of October 1,...

  1. Charting the boiler market

    International Nuclear Information System (INIS)

    2003-01-01

    The ''boiler market'' of electricity, sometimes called unsecured transmission, is electric power consumption that in public statistics is restricted by the obligation of the customers to cut their consumption at short notice and therefore are granted some discount on the network lease. The present document is part of a project that aims to provide a better understanding of the flexibility in the Norwegian power market, limited by the power-intensive industry and the boiler market. It discusses the boiler market. It begins with a discusses of the available statistics, where different sources show very dissimilar consumption figures. Then it examines how the consumption in the boiler market developed during the winter 2002/2003. Finally, there is a description of the regulations of unsecured transmission and how the various network owners adapt to the regulations.

  2. Dynamic Boiler Performance

    DEFF Research Database (Denmark)

    Sørensen, Kim

    Traditionally, boilers have been designed mainly focussing on the static operation of the plant. The dynamic capability has been given lower priority and the analysis has typically been limited to assuring that the plant was not over-stressed due to large temperature gradients. New possibilities...... developed. Analyzing boilers for dynamic operation gives rise to a number of opposing aims: shrinking and swelling, steam quality, stress levels, control system/philosophy, pressurization etc. Common for these opposing aims is that an optimum can be found for selected operation conditions. The framework has...... for buying and selling energy has increased the focus on the dynamic operation capability, efciency, emissions etc. For optimizing the design of boilers for dynamic operation a quantication of the dynamic capability is needed. A framework for optimizing design of boilers for dynamic operation has been...

  3. MODELLING, SIMULATING AND OPTIMIZING BOILERS

    DEFF Research Database (Denmark)

    Sørensen, Kim; Condra, Thomas Joseph; Houbak, Niels

    2004-01-01

    In the present work a framework for optimizing the design of boilers for dynamic operation has been developed. A cost function to be minimized during the optimization has been formulated and for the present design variables related to the Boiler Volume and the Boiler load Gradient (i.e. ring rate...... on the boiler) have been dened. Furthermore a number of constraints related to: minimum and maximum boiler load gradient, minimum boiler size, Shrinking and Swelling and Steam Space Load have been dened. For dening the constraints related to the required boiler volume a dynamic model for simulating the boiler...... performance has been developed. Outputs from the simulations are shrinking and swelling of water level in the drum during for example a start-up of the boiler, these gures combined with the requirements with respect to allowable water level uctuations in the drum denes the requirements with respect to drum...

  4. Super Boiler: First Generation, Ultra-High Efficiency Firetube Boiler

    Energy Technology Data Exchange (ETDEWEB)

    None

    2006-06-01

    This factsheet describes a research project whose goal is to develop and demonstrate a first-generation ultra-high-efficiency, ultra-low emissions, compact gas-fired package boiler (Super Boiler), and formulate a long-range RD&D plan for advanced boiler technology out to the year 2020.

  5. DE AGUA. ESTUDIO PRELIMINAR

    Directory of Open Access Journals (Sweden)

    Esther E. Pellizzari

    2015-01-01

    Full Text Available El objetivo del presente estudio fue investigar la resistencia al arsénico en cultivos puros de Pseudomonas aeruginosa , aislada de aguas subterráneas de Presidencia Roque Sáenz Peña, provincia de Chaco y evaluar la posibilidad de su uso para la remoción de este contaminante presente en las aguas subterráneas. Las cepas fueron inmovilizadas en piedra natural y se cu ltivaron en caldo de sales y 1 mgAs/L . Se observó la resistencia al arsénico y la formación de biofilm , logrando la interacción entre la s células, roca y arsénico . L a remoción de arsénico se evaluó durante 3 meses y el porcentaje de eliminación de arsénico al final del experimento fue 60%.

  6. Optimising boiler performance.

    Science.gov (United States)

    Mayoh, Paul

    2009-01-01

    Soaring fuel costs continue to put the squeeze on already tight health service budgets. Yet it is estimated that combining established good practice with improved technologies could save between 10% and 30% of fuel costs for boilers. Paul Mayoh, UK technical manager at Spirax Sarco, examines some of the practical measures that healthcare organisations can take to gain their share of these potential savings.

  7. Cuento: Agua rota

    Directory of Open Access Journals (Sweden)

    José Puben

    1966-04-01

    Full Text Available Ya avanzada la noche la lluvia empezó a caer, clara y sonora, en el empedrado del patio y sobre los amplios techos de la vieja casa. El ruido del aguacero lo despertó de un profundo sueño. La sensación de que la cañada aumentaba, a cada momento, venía del atronador y permanente cauce de las aguas vecinas.

  8. La piedra de agua

    OpenAIRE

    Ricaurte Aguirre, Lina Marcela

    2013-01-01

    En un tiempo en el que los humanos abren su corazón a la enfermedad, Suyana, una adolescente rebelde en una antigua comunidad indígena de la selva, descubre una mágica piedra de agua que la vincula con unos graciosos espíritus, quienes la guiarán para despertar su verdadera identidad y sanar a su pueblo.

  9. Potencial del Agua del suelo

    Directory of Open Access Journals (Sweden)

    Bustamante Heliodoro

    1986-12-01

    Full Text Available La energía potencial del agua presenta diferencias de un punto del suelo a otro; esas diferencias son las que originan el movimiento del agua de acuerdo a la tendencia universal de la materia en el sentido de moverse de donde la energía potencial es mayor a donde dicha energía es menor. En el suelo el agua en consecuencia se mueve hacia donde su energía decrece hasta lograr su estado de equilibrio. Se desprende entonces que la cantidad de energía potencial absoluta contenida en el agua, no es importante por sí misma, sino por su relación con la energía en diferentes lugares dentro del suelo. El concepto Potencial de agua del suelo es un criterio para esta energía.

  10. Agua y ciudad

    Directory of Open Access Journals (Sweden)

    Carolina Maturana

    2007-10-01

    ¿Dónde y en qué se relaciona todo esto con la temática agua y ciudad? La mirada desde donde se construye cada una de las obras anteriores, para por una mirada que se detiene en la "otra ciudad" y en la memoria colectiva que entrecruza la ciudad oficial con ella; es en esa otra ciudad donde me detengo en el río Bío-Bío como cuerpo testigo, como contenedor de historias, como continente de despojos, industriales y humanos, como figura representacional de la marginalidad urbana.

  11. Fouling control in biomass boilers

    Energy Technology Data Exchange (ETDEWEB)

    Romeo, Luis M.; Gareta, Raquel [Centro de Investigacion de Recursos y Consumos Energeticos (CIRCE), Universidad de Zaragoza, Centro Politecnico Superior, Maria de Luna, 3, 50018 Zaragoza (Spain)

    2009-05-15

    One of the important challenges for biomass combustion in industrial applications is the fouling tendency and how it affects to the boiler performance. The classical approach for this question is to activate sootblowing cycles with different strategies to clean the boiler (one per shift, one each six hours..). Nevertheless, it has been often reported no effect on boiler fouling or an excessive steam consumption for sootblowing. This paper illustrates the methodology and the application to select the adequate time for activating sootblowing in an industrial biomass boiler. The outcome is a control strategy developed with artificial intelligence (Neural Network and Fuzzy Logic Expert System) for optimizing the biomass boiler cleaning and maximizing heat transfer along the time. Results from an optimize sootblowing schedule show savings up to 12 GWh/year in the case-study biomass boiler. Extra steam generation produces an average increase of turbine power output of 3.5%. (author)

  12. Mod increases AGR boiler output

    International Nuclear Information System (INIS)

    Jones, W.K.C.; Rider, G.; Taylor, D.E.

    1986-01-01

    During the commissioning runs of the first reactor units at Heysham I and Hartlepool Advanced Gas-cooled Reactors (AGRs), non-uniform temperature distributions were observed across individual boiler units which were more severe than those predicted from the design analysis. This article describes the re-orificing (referruling) of the boilers to overcome this problem. The referruling has reduced boiler sensitivity and resulted in an increase of load of 7 or 8%. (U.K.)

  13. Boiler tube failure prevention in fossil fired boilers

    International Nuclear Information System (INIS)

    Townsend, R.D.

    1993-01-01

    It is the common experience of power generating companies worldwide that the main causes of forced outages on power plant are those due to boiler tube failures on fossil units. The main reason for the large number of failures are the severe environmental conditions in fossil boilers as the effects of stress, temperature, temperature gradients, corrosion, erosion and vibration combine to produce degradation of the tube steel. Corrosion by oxidation, by combustion products and by impure boiler water can significantly reduce the tube wall thickness and result in failure of a tube many years before its designed service life. Errors can also occur in the design manufacturer, storage, operation, and maintenance of boiler tubing and the wrong material installed in a critical location can lead to premature failure. Altogether, experts in the US and UK, from many different disciplines, have identified seven broad categories of boiler tube failure mechanisms. 1 tab., 2 figs

  14. Improved nuclear boiler

    International Nuclear Information System (INIS)

    Pierart, Robert.

    1980-01-01

    The improved nuclear boiler concerned in this invention is of the kind comprising, inter alia, a nuclear reactor supported by a metallic structure and of which the vessel is at least enclosed in part by a casing acting as a protective containment integrated in this structure. It is essentially characterized in that this casing is fitted into and maintained in position in the metallic structure by removable locking devices which enable the casing to be withdrawn from the remainder of the structure. Hence, after the casing has been withdrawn or removed from the metallic structure, access to the reactor vessel is readily obtained for inspection and/or testing from without [fr

  15. Estudio y caracterización de nuevas emulsiones de haluro de plata como materiales de registro holográfico

    Directory of Open Access Journals (Sweden)

    Neipp, C.

    2000-08-01

    Full Text Available One of the most interesting techniques for the production of holographic optical elements is silver halide sensitised gelatin (SHSG. It combines the high sensitivity of photographic emulsions with the well-known low scattering and high diffraction efficiencies corresponding to dichromated gelatin. In this work we made a comparative study on SHSG holograms recorded on three different red sensitive emulsions: Agfa 8E75 HD, Slavich PFG-01 and BB-640 . The influence of the degree of hardening of the gelatin and the size and concentration of silver halide grains in the SHSG proccess is studied. And we will show that real high diffraction efficiencies can be obtained when using BB-640 and Slavich PFG-01 plates for recording phase transmission holograms (as high as 93% for PFG-01 and 90% for BB-640, allowing for reflections. Our investigations reveal that PFG-01 and BB-640 emulsions are not only a substitution to Agfa material, but may offer better results at a moment in which Agfa has stopped its production of holographic material.

    Una de las técnicas más interesantes para la obtención de elementos ópticos holográficos es la gelatina sensibilizada de haluro de plata (GSHP. Esta técnica combina la alta sensibilidad de las emulsiones fotográficas con los conocidos altos rendimientos en difracción y bajos niveles de scattering correspondientes a la gelatina dicromatada. En este trabajo se ha hecho un estudio comparativo sobre hologramas en gelatina sensibilizada de haluro de plata registrados en tres emulsiones diferentes sensibles al rojo: Agfa 8E75 HD, Slavich PFG-01 y BB-640. En dicho estudio se ha analizado la influencia del grado de endurecido de la gelatina y la concentración y el tamaño de los granos de haluro de plata en el procesado GHSP. Se obtuvieron rendimientos en difracción realmente altos cuando se utilizaron las placas BB-640 y Slavich PFG-01 para el registro de hologramas de fase por transmisión (tan altos como el 93

  16. Market review. Pellet wood gasification boiler / combination boiler. 8. ed.; Marktuebersicht. Scheitholzvergaser-/Kombikessel

    Energy Technology Data Exchange (ETDEWEB)

    Uth, Joern

    2012-01-15

    In the market review under consideration on pellet wood gasification boilers and combination boilers, the Federal Ministry of Food, Agriculture and Consumer Protection (Bonn, Federal Republic of Germany) reports on planning and installation of wood-fired heating systems, recommendations regarding to the technical assessment of boiler systems, buffers/combination boilers, prices of pellet wood gasification boilers, data sheets of the compared pellet wood gasification boilers, pellet wood combination boilers, prices of pellet wood combination boilers, data sheets of the compared pellet wood gasification boilers, list of providers.

  17. Pellet wood gasification boiler / Combination boiler. Market review. 7. ed.; Scheitholzvergaser-/Kombikessel. Marktuebersicht

    Energy Technology Data Exchange (ETDEWEB)

    Uth, Joern

    2010-08-15

    In the market review under consideration on pellet wood gasification boilers and combination boilers, the Federal Ministry of Food, Agriculture and Consumer Protection (Bonn, Federal Republic of Germany) report on planning and installation of wood-fired heating systems, recommendations regarding to the technical assessment of boiler systems, buffers/combination boilers, prices of pellet wood gasification boilers, data sheets of the compared pellet wood gasification boilers, pellet wood combination boilers, prices of pellet wood combination boilers, data sheets of the compared pellet wood gasification boilers, list of providers.

  18. A study on the boiler efficiency influenced by the boiler operation parameter in fossil power plant

    International Nuclear Information System (INIS)

    Kwon, Y. S.; Suh, J. S.

    2002-01-01

    The main reason to analyze the boiler operation parameter in fossil power plant is to increase boiler high efficiency and energy saving movement in the government. This study intends to have trend and analyze the boiler efficiency influenced by the boiler parameter in sub-critical and super-critical type boiler

  19. 49 CFR 230.47 - Boiler number.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Boiler number. 230.47 Section 230.47..., DEPARTMENT OF TRANSPORTATION STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS Boilers and Appurtenances Steam Gauges § 230.47 Boiler number. (a) Generally. The builder's number of the boiler, if known, shall...

  20. 30 CFR 77.413 - Boilers.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Boilers. 77.413 Section 77.413 Mineral... Mechanical Equipment § 77.413 Boilers. (a) Boilers shall be equipped with guarded, well-maintained water... the gages shall be kept clean and free of scale and rust. (b) Boilers shall be equipped with automatic...

  1. 30 CFR 56.13030 - Boilers.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Boilers. 56.13030 Section 56.13030 Mineral... HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Compressed Air and Boilers § 56.13030 Boilers. (a) Fired pressure vessels (boilers) shall be equipped with water level gauges, pressure gauges...

  2. 30 CFR 57.13030 - Boilers.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Boilers. 57.13030 Section 57.13030 Mineral... HEALTH SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Compressed Air and Boilers § 57.13030 Boilers. (a) Fired pressure vessels (boilers) shall be equipped with water level gauges, pressure...

  3. CFB boilers in multifuel application

    International Nuclear Information System (INIS)

    Goral, D.; Krzton, B.

    2007-01-01

    Fuel flexibility characteristic for CFB boilers plays an important rule in industrial and utility size applications. Possibility to use wider range of fuels that has been long time considered as by-products or wastes and possibility to design boilers able to operate with alternative fuels is an important factor that improves fuel delivery security and plant economy. Presented article is based on similar publications that present Foster Wheeler's experience in design and delivery of the CFB boilers for wide range of coals and cofiring by- products of crude oil refining and coal processing. Aspects of biomass cofiring will be also presented. (author)

  4. Radiactividad en aguas de consumo

    Directory of Open Access Journals (Sweden)

    José Luis Gutiérrez-Villanueva

    2011-12-01

    Full Text Available La directiva europea sobre calidad en el agua potable del año 2003 estableció los límites para los valores de los parámetros radiactivos. Esta directiva europea fue incorporada a la legislación 2003. Los parámetros a analizar son los índices alfa y beta total, el contenido en tritio y la dosis indicativa total. El correspondiente real decreto, en el caso de España, se comenzó a aplicar en el año 2008. No solamente el agua potable procedente de captaciones públicas está sujeta a control, sino que también se deben controlar las aguas comerciales. En ambos casos se han llevado a cabo estudios en todo el mundo. Existe un rango amplio de técnicas para la medida de la radiactividad en el agua de consumo. Este artículo describe tales técnicas e indica cuando se debe aplicar cada una de ellas. Por último, se muestran los resultados más importantes obtenidos tras el análisis de aguas potables y comerciales, tanto en aguas españolas como de fuera de España. Los resultados muestran que se superan los límites en algunos casos y por lo tanto se debe prestar especial atención a fin de reducir los niveles de radiactividad en las aguas potables todo lo posible.

  5. 46 CFR 61.05-10 - Boilers in service.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Boilers in service. 61.05-10 Section 61.05-10 Shipping... INSPECTIONS Tests and Inspections of Boilers § 61.05-10 Boilers in service. (a) Each boiler, including superheater, reheater, economizer, auxiliary boiler, low-pressure heating boiler, and unfired steam boiler...

  6. ENERGY STAR Certified Commercial Boilers

    Data.gov (United States)

    U.S. Environmental Protection Agency — Certified models meet all ENERGY STAR requirements as listed in the Version 1.0 ENERGY STAR Program Requirements for Commercial Boilers that are effective as of...

  7. Hybrid model of steam boiler

    International Nuclear Information System (INIS)

    Rusinowski, Henryk; Stanek, Wojciech

    2010-01-01

    In the case of big energy boilers energy efficiency is usually determined with the application of the indirect method. Flue gas losses and unburnt combustible losses have a significant influence on the boiler's efficiency. To estimate these losses the knowledge of the operating parameters influence on the flue gases temperature and the content of combustible particles in the solid combustion products is necessary. A hybrid model of a boiler developed with the application of both analytical modelling and artificial intelligence is described. The analytical part of the model includes the balance equations. The empirical models express the dependence of the flue gas temperature and the mass fraction of the unburnt combustibles in solid combustion products on the operating parameters of a boiler. The empirical models have been worked out by means of neural and regression modelling.

  8. Ciclo cósmico del agua

    OpenAIRE

    Martínez-Frías, J.

    2008-01-01

    1 página.-- Trabajo presentado en la Exposición Internacional "Agua y Desarrollo Sostenible" celebrada en Zaragoza del 14 de Junio al 14 de septiembre del 2008 (Pabellón: Torre del Agua. Agua para la vida).

  9. Boiler-turbine life extension

    Energy Technology Data Exchange (ETDEWEB)

    Natzkov, S. [TOTEMA, Ltd., Sofia (Bulgaria); Nikolov, M. [CERB, Sofia (Bulgaria)

    1995-12-01

    The design life of the main power equipment-boilers and turbines is about 105 working hours. The possibilities for life extension are after normatively regulated control tests. The diagnostics and methodology for Boilers and Turbines Elements Remaining Life Assessment using up to date computer programs, destructive and nondestructive control of metal of key elements of units equipment, metal creep and low cycle fatigue calculations. As well as data for most common damages and some technical decisions for elements life extension are presented.

  10. CFD Simulation On CFBC Boiler

    Directory of Open Access Journals (Sweden)

    Amol S. Kinkar

    2015-02-01

    Full Text Available Abstract Heavy industrialization amp modernization of society demands in increasing of power cause to research amp develop new technology amp efficient utilization of existing power units. Variety of sources are available for power generation such as conventional sources like thermal hydro nuclear and renewable sources like wind tidal biomass geothermal amp solar. Out of these most common amp economical way for producing the power is by thermal power stations. Various industrial boilers plays an important role to complete the power generation cycle such as CFBC Circulating Fluidized Bed Combustion FBC Fluidized Bed Combustion AFBC Atmospheric Fluidized Bed Combustion Boiler CO Boiler RG amp WHR Boiler Waster heat recovery Boiler. This paper is intended to comprehensively give an account of knowledge related to refractory amp its failure in CFBC boiler with due effect of flue gas flow during operation on refractory by using latest technology of CAD Computer aided Design amp CAE Computer aided Engineering. By conceptual application of these technology the full scale model is able to analyze in regards the flow of flue gas amp bed material flow inside the CFBC loop via CFD Computational Fluid Dynamics software. The results obtained are helpful to understand the impact of gas amp particles on refractory in different areas amp also helped to choose suitable refractory material in different regions.

  11. Boiler using combustible fluid

    Science.gov (United States)

    Baumgartner, H.; Meier, J.G.

    1974-07-03

    A fluid fuel boiler is described comprising a combustion chamber, a cover on the combustion chamber having an opening for introducing a combustion-supporting gaseous fluid through said openings, means to impart rotation to the gaseous fluid about an axis of the combustion chamber, a burner for introducing a fluid fuel into the chamber mixed with the gaseous fluid for combustion thereof, the cover having a generally frustro-conical configuration diverging from the opening toward the interior of the chamber at an angle of between 15/sup 0/ and 55/sup 0/; means defining said combustion chamber having means defining a plurality of axial hot gas flow paths from a downstream portion of the combustion chamber to flow hot gases into an upstream portion of the combustion chamber, and means for diverting some of the hot gas flow along paths in a direction circumferentially of the combustion chamber, with the latter paths being immersed in the water flow path thereby to improve heat transfer and terminating in a gas outlet, the combustion chamber comprising at least one modular element, joined axially to the frustro-conical cover and coaxial therewith. The modular element comprises an inner ring and means of defining the circumferential, radial, and spiral flow paths of the hot gases.

  12. Agua Caliente and Their Music.

    Science.gov (United States)

    Ryterband, Roman

    1979-01-01

    Discusses the traditional music of the Agua Caliente band of California's Desert Cahuilla Indian tribe, including accompanying instruments, types of songs, thematic material, and performance routines. Exploring the structure of the music, the article describes meter, tempo, harmony and tonal gravitations, and use of words. (DS)

  13. New controls spark boiler efficiency

    Energy Technology Data Exchange (ETDEWEB)

    Engels, T. (Monsanto, University Park, IL (United States))

    1993-09-01

    Monsanto's NutraSweet plant in University Park, IL, produces aspartame, the patented NutraSweet artificial sweetener product. Until recently, boiler control was managed by a '60s-era Fireye jackshaft system in which air and natural gas were mechanically linked with an offset to compensate for oxygen trim. The interlocking devices on the Fireye system were becoming obsolete, and the boiler needed a new front end retrofitted for low emissions. In order to improve boiler control efficiency, we decided to modernize and automate the entire boiler control system. We replaced the original jackshaft system, and installed a Gordon-Piet burner system, including gas valves, air dampers, blowers, and burner. The upgrade challenges included developing a control strategy and selecting and implementing a process control system. Since our plant has standardized on the PROVOX process management information system from Fisher Controls (now Fisher-Rosemount Systems) to support most of our process, it was a natural and logical choice for boiler controls as well. 2 figs.

  14. Failure analysis of boiler tube

    International Nuclear Information System (INIS)

    Mehmood, K.; Siddiqui, A.R.

    2007-01-01

    Boiler tubes are energy conversion components where heat energy is used to convert water into high pressure superheated steam, which is then delivered to a turbine for electric power generation in thermal power plants or to run plant and machineries in a process or manufacturing industry. It was reported that one of the tubes of a fire-tube boiler used in a local industry had leakage after the formation of pits at the external surface of the tube. The inner side of the fire tube was working with hot flue gasses with a pressure of 10 Kg/cm/sup 2/ and temperature 225 degree C. The outside of the tube was surrounded by feed water. The purpose of this study was to determine the cause of pits developed at the external surface of the failed boiler tube sample. In the present work boiler tube samples of steel grade ASTM AI61/ASTM A192 were analyzed using metallographic analysis, chemical analysis, and mechanical testing. It was concluded that the appearance of defects on the boiler tube sample indicates cavitation type corrosion failure. Cavitation damage superficially resembled pitting, but surface appeared considerably rougher and had many closely spaced pits. (author)

  15. Túnel bajo el agua

    Directory of Open Access Journals (Sweden)

    Stamhuis, E.

    1964-03-01

    Full Text Available This article describes the results obtained by the Dutch Central Institute of Scientific Research when studying the problem of underwater tunnels. This Institute has sought to establish general specifications for the design of this type of tunnels, so that they shall be more efficient than those at present in use. Firstly, a study was made of the strength, waterproof qualities, and most rational type of ventilation, with a view to drawing up of general principles on this aspect of the design. An analysis is given of the shape, suitable cross sections and constructive methods, and these are compared with those adopted in the construction of underwater tunnels at present in use in America. Particular attention has been given to designs which are largely based on prefabrication and the use of factory made structural parts, and also on the transport and erection of these at the site. The author goes on to discuss the interplay of soil and water pressures, buoyancy forces, and cases in which the tunnel is subjected to important bending and shear forces on particular sections of it. In this connection care is taken to give the theoretical considerations a ready practical interpretation. In particular, a description is given of special distance pieces which connect the two tubes making up a tunnel, also the system of joining two sections of the tube, and the measure of watertightness and flexibility which such joints provide. Finally, a summary is given of the theoretical foundations, as well as a number of observations and items of advise, which are applicable to these types of structures.El ingeniero A. Eggink describió, en un trabajo publicado últimamente, un nuevo tipo de túnel bajo el agua para canalizar la circulación rodada. En este trabajo se desarrolla un análisis sobre las consideraciones que han jugado un papel predominante en la redacción del proyecto de ejecución de un túnel subacuo. Acompañan al trabajo los resultados referentes

  16. Structured Mathematical Modeling of Industrial Boiler

    Directory of Open Access Journals (Sweden)

    Abdullah Nur Aziz

    2014-04-01

    Full Text Available As a major utility system in industry, boilers consume a large portion of the total energy and costs. Significant reduction of boiler cost operation can be gained through improvements in efficiency. In accomplishing such a goal, an adequate dynamic model that comprehensively reflects boiler characteristics is required. This paper outlines the idea of developing a mathematical model of a water-tube industrial boiler based on first principles guided by the bond graph method in its derivation. The model describes the temperature dynamics of the boiler subsystems such as economizer, steam drum, desuperheater, and superheater. The mathematical model was examined using industrial boiler performance test data.It can be used to build a boiler simulator or help operators run a boiler effectively.

  17. Structured Mathematical Modeling of Industrial Boiler

    OpenAIRE

    Aziz, Abdullah Nur; Nazaruddin, Yul Yunazwin; Siregar, Parsaulian; Bindar, Yazid

    2014-01-01

    As a major utility system in industry, boilers consume a large portion of the total energy and costs. Significant reduction of boiler cost operation can be gained through improvements in efficiency. In accomplishing such a goal, an adequate dynamic model that comprehensively reflects boiler characteristics is required. This paper outlines the idea of developing a mathematical model of a water-tube industrial boiler based on first principles guided by the bond graph method in its derivation. T...

  18. Cracking and corrosion recovery boiler

    Energy Technology Data Exchange (ETDEWEB)

    Suik, H. [Tallinn Technical University, Horizon Pulp and Paper, Tallinn (Estonia)

    1998-12-31

    The corrosion of heat surfaces and the cracking the drums are the main problems of the recovery boiler. These phenomena have been appeared during long-term operation of boiler `Mitsubishi - 315` erected at 1964. Depth of the crack is depending on the number of shutdowns and on operation time. Corrosion intensity of different heat surfaces is varying depend on the metal temperature and the conditions at place of positioning of tube. The lowest intensity of corrosion is on the bank tubes and the greatest is on the tubes of the second stage superheater and on the tubes at the openings of air ports. (orig.) 5 refs.

  19. Cracking and corrosion recovery boiler

    Energy Technology Data Exchange (ETDEWEB)

    Suik, H [Tallinn Technical University, Horizon Pulp and Paper, Tallinn (Estonia)

    1999-12-31

    The corrosion of heat surfaces and the cracking the drums are the main problems of the recovery boiler. These phenomena have been appeared during long-term operation of boiler `Mitsubishi - 315` erected at 1964. Depth of the crack is depending on the number of shutdowns and on operation time. Corrosion intensity of different heat surfaces is varying depend on the metal temperature and the conditions at place of positioning of tube. The lowest intensity of corrosion is on the bank tubes and the greatest is on the tubes of the second stage superheater and on the tubes at the openings of air ports. (orig.) 5 refs.

  20. Sootblowing optimization for improved boiler performance

    Science.gov (United States)

    James, John Robert; McDermott, John; Piche, Stephen; Pickard, Fred; Parikh, Neel J.

    2012-12-25

    A sootblowing control system that uses predictive models to bridge the gap between sootblower operation and boiler performance goals. The system uses predictive modeling and heuristics (rules) associated with different zones in a boiler to determine an optimal sequence of sootblower operations and achieve boiler performance targets. The system performs the sootblower optimization while observing any operational constraints placed on the sootblowers.

  1. Optimizing the Integrated Design of Boilers - Simulation

    DEFF Research Database (Denmark)

    Sørensen, K.; Karstensen, C.; Condra, T.

    2004-01-01

    Boilers can be considered as consisting of three main components: (i) the pressure part, (ii) the burner and (iii) the control system. To be able to develop the boilers of the future (i.e. the boilers with the lowest emissions, the highest efciency, the best dynamic performance etc.) it is import...

  2. MULTIPLE LINEAR REGRESSION ANALYSIS FOR PREDICTION OF BOILER LOSSES AND BOILER EFFICIENCY

    OpenAIRE

    Chayalakshmi C.L

    2018-01-01

    MULTIPLE LINEAR REGRESSION ANALYSIS FOR PREDICTION OF BOILER LOSSES AND BOILER EFFICIENCY ABSTRACT Calculation of boiler efficiency is essential if its parameters need to be controlled for either maintaining or enhancing its efficiency. But determination of boiler efficiency using conventional method is time consuming and very expensive. Hence, it is not recommended to find boiler efficiency frequently. The work presented in this paper deals with establishing the statistical mo...

  3. Aguas contemporáneas

    Directory of Open Access Journals (Sweden)

    Underlea Bruscato Portella

    2007-10-01

    Full Text Available El agua parece un material esquivo para la arquitectura. Propio del mundo natural, fluido y cambiante, distante de la estabilidad perenne de los edificios, que la eluden con sus gruesos muros y amplias techumbres. Sin embargo, algunas construcciones han logrado una emotiva amalgama con el devenir del agua, como los jardines de la Alhambra en Granada. Quizás por provenir de una cultura que apreciaba la escasez del recurso líquido y su frescor en la vida diaria. Estanques, fuentes, canales, regaderas, se combinan con el aroma de los naranjos, el delicado aderezado de las columnas y arcos, la sombra de los salones, la vista enmarcada de las sierras, el lujo de la corte, el placer de los sentidos.

  4. El agua y el arte

    Directory of Open Access Journals (Sweden)

    Chueca Goitia, Fernando

    1999-10-01

    Full Text Available Not available.En el artículo «El agua y el arte» se analiza la importancia que tiene el agua en el mundo del arte, a través de los jardines y sus muchas variedades. El autor se refiere luego a los diversos aspectos que tienen el jardín francés, el jardín inglés, y el jardín español, de acuerdo con su geografía, pluviometría y cultura propias. El jardín español de abolengo musulmán es el jardín de los países secos que atesoran el agua como bien precioso, porque no lo regala la naturaleza y es necesario transportarlo y encerrarlo en el cofre de una arquitectura sugerente. Por eso el jardín español es un jardín recoleto y misterioso, enclaustrado y secreto, sin lejanías ni perspectivas. Se extiende luego el autor en los jardines de la Alhambra granadina, sin olvidar otros, principalmente andaluces. Jardines de los claustros monacales, de El Escorial y de los Sitios reales, también interesan, en suma, al articulista.

  5. Failure Analysis of 600 MW Supercritical Boiler Water Wall

    OpenAIRE

    Fu Huilin; Cai Zhengchun; Yan Xiaozhong; He Jinqiao; Zhou Yucai

    2013-01-01

    Boiler tube often causes abnormal boiler outage, bringing greater economic losses. This thesis mainly comes from the dynamics of boiler water, boiler furnace accident location of wall temperature distribution to explore the cause of the accident boiler. Calculation results show that the deformation will seriously reduce the boiler allowable maximum temperature difference between the screens. And the boiler is not over-temperature, low temperature difference between the screens, which have bur...

  6. Biomass boiler still best choice

    International Nuclear Information System (INIS)

    Wallace, Paula

    2014-01-01

    Full text: The City of Mount Gambier upgraded its boiler in September after analysis showed that biomass was still the optimal energy option. The Mount Gambier Aquatic Centre was built by the local city council in the 1980s as an outdoor pool facility for the public. The complex has three pools — an Olympic-sized, toddler and a learner pool — for a total volume of 1.38ML (including balance tanks). The large pool is heated to 27-28°C, the smaller one 30-32°C. From the very beginning, the pool water was heated by a biomass boiler, and via two heat exchangers whose combined capacity is 520 kW. The original biomass boiler ran on fresh sawdust from a local timber mill. After thirty years of dedicated service the original boiler had become unreliable and difficult to operate. Replacement options were investigated and included a straight gas boiler, a combined solar hot water and gas option, and biomass boilers. The boiler only produces heat, not electricity. All options were subjected to a triple bottom line assessment, which included potential capital costs, operating costs, community and environmental benefits and costs. The project was also assessed using a tool developed by Mount Gambier City Council that considers the holistic benefits — the CHAT Tool, which stands for Comprehensive Holistic Assessment Tool. “Basically it is a survey that covers environmental, social, economic and governance factors,” the council's environmental sustainability officer, Aaron Izzard told WME. In relation to environmental considerations, the kinds of questions explored by the CHAT Tool included: Sustainable use of resources — objective is to reduce council's dependence on non-renewable resources; Greenhouse emissions — objective is to reduce council's contribution of GHG into the atmosphere; Air quality — objective is to improve local air quality. The conclusion of these analyses was that while a biomass boiler would have a higher capital cost than a straight gas

  7. Agua potable y saneamiento en la Argentina

    OpenAIRE

    Auge, Miguel

    2007-01-01

    Este trabajo fue presentado originalmente en el Foro Regional del Agua, con el título “Problemática del Acceso al Agua Potable y al Saneamiento en Argentina”. Dicho foro, organizado por la Defensoría del Pueblo de la Nación Argentina, se desarrolló en Córdoba, en mayo del 2007.

  8. 46 CFR 52.25-20 - Exhaust gas boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Exhaust gas boilers. 52.25-20 Section 52.25-20 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) MARINE ENGINEERING POWER BOILERS Other Boiler Types § 52.25-20 Exhaust gas boilers. Exhaust gas boilers with a maximum allowable working pressure...

  9. 46 CFR 63.25-1 - Small automatic auxiliary boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Small automatic auxiliary boilers. 63.25-1 Section 63.25... AUXILIARY BOILERS Requirements for Specific Types of Automatic Auxiliary Boilers § 63.25-1 Small automatic auxiliary boilers. Small automatic auxiliary boilers defined as having heat-input ratings of 400,000 Btu/hr...

  10. Fluidized bed boiler feed system

    Science.gov (United States)

    Jones, Brian C.

    1981-01-01

    A fluidized bed boiler feed system for the combustion of pulverized coal. Coal is first screened to separate large from small particles. Large particles of coal are fed directly to the top of the fluidized bed while fine particles are first mixed with recycled char, preheated, and then fed into the interior of the fluidized bed to promote char burnout and to avoid elutriation and carryover.

  11. Las aguas termominerales de Tabio

    Directory of Open Access Journals (Sweden)

    Antonio María Barriga Villalba

    1933-01-01

    Full Text Available La pintoresca población de Tabio, situada en el vallecito que forman dos repliegues de la gran cordillera montañosa que rodea la sabana de Bogotá, es un pueblecito apacible, famoso desde tiempo inmemorial por las aguas termales que brotan en la falda de los cerros situados al occidente, a unos mil metros de la iglesia de la población, en terrenos de propiedad del doctor Pompilio Martínez. Fue fundada Tabio en el año 1761 (*. Se halla a 4°50'50" de latitud norte y 0° 04'00" de longitud del meridiano de Bogotá. Clima seco en la mayor parte del año, temperatura media 14°.5 C. Presión atmosférica 560 mm.; altura sobre el nivel del mar 2.650 metros; temperatura de. ebullición del agua 91°.62 C.; humedad en vapor de agua, por metro cúbico, en los días secos 127,5 gramos por metro cúbico; en los días húmedos, 251,8 gramos por metro cúbico. En el sitio de las fuentes la humedad relativa media es de 38.38 por 100 y la temperatura de la atmósfera varía de 10° C. hasta 23°C.; en los días de sol, hacia las doce del día, la temperatura de la atmósfera cerca de las fuentes es de 20°-22°C.

  12. AGUA TIBIA PRIMITIVE AREA, CALIFORNIA.

    Science.gov (United States)

    Irwin, William P.; Thurber, Horace K.

    1984-01-01

    The Agua Tibia Primitive Area in southwestern California is underlain by igneous and metamorphic rocks that are siilar to those widely exposed throughout much of the Peninsular Ranges. To detect the presence of any concealed mineral deposits, samples of stream sediments were collected along the various creeks that head in the mountain. As an additional aid in evaluating the mineral potential, an aeromagnetic survey was made and interpreted. A search for records of past or existing mining claims within the primitive area was made but none was found. Evidence of deposits of metallic or nonmetallic minerals was not seen during the study.

  13. Inception report and gap analysis. Boiler inspection

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-06-01

    This inception and gap analysis report on boilers in Latvia, has been prepared in the framework of the 'Implementation of the EU directive on energy performance of buildings: development of the Latvian Scheme for energy auditing of building and inspection of boilers'. The report is the basis for the establishment of training of boiler inspectors; it develops a gap analysis for better understanding and estimating the number of installations in Latvia and develops suggestions for the institutional set up. In particular includes information on existing standard and regulation on boiler, suggestion for the content of the training material of experts for boiler inspections and a syllabus of the training course. A specific section is dedicated to the suggestion for certification system of trained boiler inspectors. (au)

  14. Inception report and gap analysis. Boiler inspection

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-06-01

    This inception and gap analysis report on boilers in Latvia, has been prepared in the framework of the 'Implementation of the EU directive on energy performance of buildings: development of the Latvian Scheme for energy auditing of building and inspection of boilers'. The report is the basis for the establishment of training of boiler inspectors; it develops a gap analysis for better understanding and estimating the number of installations in Latvia and develops suggestions for the institutional set up. In particular includes information on existing standard and regulation on boiler, suggestion for the content of the training material of experts for boiler inspections and a syllabus of the training course. A specific section is dedicated to the suggestion for certification system of trained boiler inspectors. (au)

  15. Further development of recovery boiler; Soodakattilan kehitystyoe

    Energy Technology Data Exchange (ETDEWEB)

    Janka, K.; Siiskonen, P.; Sundstroem, K. [Tampella Power Oy, Tampere (Finland)] [and others

    1996-12-01

    The global model of a recovery boiler was further developed. The aim is to be able to model the velocity, temperature and concentration fields in a boiler. At this moment the model includes submodels for: droplet drying, pyrolysis, char burning, gas burning and for droplet trajectory. The preliminary study of NO{sub x} and fly ash behaviour in a boiler was carried out. The study concerning flow field in the superheater area was carried out a 2-dimensional case in which the inflow parameters were taken from global model of a recovery boiler. Further the prediction methods of fouling in a recovery boiler were developed based on theoretical calculations of smelting behaviour of multicomponent mixtures and measurements at operating recovery boilers. (author)

  16. El abastecimiento de agua a Cartagena

    Directory of Open Access Journals (Sweden)

    Miguel Borja Bernabé Crespo

    2015-01-01

    Full Text Available La escasez de agua en la región del sureste peninsular, en la que se ubica Cartagena y su comarca,ha obligado a buscar y traer recursos foráneos de agua para atender sus necesidades de abastecimiento.Inicialmente, al no existir cursos permanentes de agua, se recurre a pozos y aljibes, apequeños acueductos desde fuentes y manantiales de aforo escaso, y a alumbramientos de subálveasmediante galerías con lumbreras. Las demandas aumentan y se plantea la traída de aguas dela parte alta de la Cuenca del Segura. Mediante las infraestructuras de la Mancomunidad de losCanales del Taibilla (MCT, creada por Decreto Ley de 4 de octubre de 1927 llega el agua hastaCartagena en 1945. En los últimos treinta y cinco años, a estas aguas se han unido caudales delTrasvase Tajo-Segura y finalmente aguas procedentes de desaladoras. La gestión del abastecimientode agua, a lo largo de la historia de Cartagena (desde la fundación de Carthago Nova enel 229 a.C. hasta los primeros años del siglo XXI ha generado un rico patrimonio de infraestructurashidráulicas y una experimentada cultura de usos del agua.Se expone la situación del abastecimiento de Cartagena (ciudad y barrios como demandante derecursos propios y foráneos de agua. La inversión en las redes de distribución y la concienciaciónde la mayor parte de los usuarios en un uso sostenible, que permiten un continuado abastecimientode «agua de boca», así como la regeneración de las aguas residuales para otros usos. Eneste trabajo geográfico (espacial e histórico (diacrónico, las fuentes utilizadas han sido las entrevistasa los gestores de las empresas encargadas de la distribución del agua en alta (conduccionesde gran diámetro como las de la MCT y en baja (conducciones de pequeño diámetro como las deHIDROGEA, y el acceso a la documentación del Archivo Municipal de Cartagena, del Regionalde Murcia, de la Mancomunidad de Canales del Taibilla, y el de la Confederación Hidrográficadel Segura

  17. Stress-Assisted Corrosion in Boiler Tubes

    Energy Technology Data Exchange (ETDEWEB)

    Preet M Singh; Steven J Pawel

    2006-05-27

    A number of industrial boilers, including in the pulp and paper industry, needed to replace their lower furnace tubes or decommission many recovery boilers due to stress-assisted corrosion (SAC) on the waterside of boiler tubes. More than half of the power and recovery boilers that have been inspected reveal SAC damage, which portends significant energy and economic impacts. The goal of this project was to clarify the mechanism of stress-assisted corrosion (SAC) of boiler tubes for the purpose of determining key parameters in its mitigation and control. To accomplish this in-situ strain measurements on boiler tubes were made. Boiler water environment was simulated in the laboratory and effects of water chemistry on SAC initiation and growth were evaluated in terms of industrial operations. Results from this project have shown that the dissolved oxygen is single most important factor in SAC initiation on carbon steel samples. Control of dissolved oxygen can be used to mitigate SAC in industrial boilers. Results have also shown that sharp corrosion fatigue and bulbous SAC cracks have similar mechanism but the morphology is different due to availability of oxygen during boiler shutdown conditions. Results are described in the final technical report.

  18. Boiler plants completed in record time

    International Nuclear Information System (INIS)

    Anon.

    2001-01-01

    Bubbling fluidised bed (BFB) combustion has steadily increased its share of the boiler market in recent years, particularly in the Nordic region, where it is particularly well-suited to handling the high moisture content biofuels produced and used by the forest products industry. Foster Wheeler is the world's leading supplier of fluidised bed combustion technology. Over 200 of the more than 300 fluidised bed boilers supplied by the company are circulating fluidised bed (CFB) designs, a market in which Foster Wheeler has more than a 40% share. Foster Wheeler Energia Oy supplied the Myllykoski project at Anjalankoski with a fluidised bed boiler, auxiliary steam boilers, and flue gas scrubber systems

  19. The Technology Introduction of Chain Boiler Energy Conservation Transformation

    Science.gov (United States)

    Li, Henan; Liu, Xiwen; Yuan, Hong; Lin, Jiadai; Zhang, Yu

    2017-12-01

    Introduced the present status of chain boiler efficiency is low, the system analysis of the chain boiler optimization and upgrading of technology, for the whole progress of chain boiler to provide some ideas and reference.

  20. Elevated temperature failures in boiler tubes - case studies

    International Nuclear Information System (INIS)

    Gowrisankar, I.; Bandyopadhyay, G.

    1989-01-01

    Metallurgical investigation of boiler tube failures enables identification of failure mechanisms and the underlying cause related to boiler conditions. Some case studies in short term overheating, prolonged overheating and low cycle fatigue failures in boiler tubes are discussed. (author)

  1. EFFICIENCY IMPROVEMENT IN INDUSTRIAL BOILER BY FLUE GAS DUCT INSULATION

    OpenAIRE

    Sanjay H. Zala

    2017-01-01

    Now a days in industry major losses are find out so here we calculate these losses and find out efficiency of boiler. Boiler efficiency and energy losses from boiler are important parameter for any industry using boiler. In this work a detailed analysis was carried out for boiler at Anish Chemicals Bhavnagar. It is a combined water and fire tube boiler using biomass coal as fuel. Boiler efficiency calculated by direct method is in range of (78.5% to 81.6%). Major losses from boiler are heat ...

  2. MODELLING, SIMULATING AND OPTIMIZING BOILERS

    DEFF Research Database (Denmark)

    Sørensen, K.; Condra, T.; Houbak, Niels

    2003-01-01

    , and the total stress level (i.e. stresses introduced due to internal pressure plus stresses introduced due to temperature gradients) must always be kept below the allowable stress level. In this way, the increased water-/steam space that should allow for better dynamic performance, in the end causes limited...... freedom with respect to dynamic operation of the plant. By means of an objective function including as well the price of the plant as a quantification of the value of dynamic operation of the plant an optimization is carried out. The dynamic model of the boiler plant is applied to define parts...

  3. Wood fuelled boiler operating costs

    International Nuclear Information System (INIS)

    Sandars, D.L.

    1995-01-01

    This report is a management study into the operating costs of wood-fired boilers. Data obtained from existing wood-fired plant has been analysed and interpreted using the principles of machinery management and the science that underlies the key differences between this fuel and any other. A set of budgeting principles has been developed for the key areas of labour requirement, insurance, maintenance and repair and electricity consumption. Other lesser cost centres such as the provision of shelter and the effects of neglect and accidents have also been considered, and a model constructed. (author)

  4. Economic evaluation of a coal fired boiler

    International Nuclear Information System (INIS)

    Briem, J.J.

    1983-01-01

    This paper provides basic information on boiler economics which will assist steam users in analyzing the feasibility of using coal to generate steam - in either new or existing facilities. The information presented covers boilers ranging in size from 10,000 to 100,000 pounds per hour steaming capacity

  5. 46 CFR 109.555 - Propulsion boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Propulsion boilers. 109.555 Section 109.555 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) A-MOBILE OFFSHORE DRILLING UNITS OPERATIONS Miscellaneous § 109.555 Propulsion boilers. The master or person in charge and the engineer in charge shall...

  6. 29 CFR 1915.162 - Ship's boilers.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 7 2010-07-01 2010-07-01 false Ship's boilers. 1915.162 Section 1915.162 Labor Regulations Relating to Labor (Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT Ship's Machinery and Piping Systems § 1915.162 Ship's boilers. (a) Before...

  7. Aguas de un mismo caudal

    Directory of Open Access Journals (Sweden)

    Carlos Morales

    2015-01-01

    Full Text Available Borges, creía que “el periodismo distorsiona la mentalidad del escritor”, el autor de este artículo, plantea en cambio que son “aguas de un mismo caudal, que muy a menudo viajan juntas”, varias han sido, y son, las concepciones que han expuesto célebres protagonistas de estos dos hechos escriturales a favor y en contra del ejercicio del periodismo para mejorar o perjudicar al escritor. El aparente divorcio entre literatura y periodismo radica cabalmente en el intento equivocado de separarlos. En verdad son lo mismo y bien podríamos clasificar al periodismo como un género dentro de la literatura.

  8. Developing Boiler Concepts as Integrated Units

    DEFF Research Database (Denmark)

    Sørensen, Kim; Condra, Thomas Joseph; Houbak, Niels

    2004-01-01

    - consisting of pressure part, burner and control system. The Technical University of Denmark, MEK - Energy Engineering Section [12] has participated in the modelling process. The project has included static and dynamic modelling of the boiler concept. For optimization of operation, verication of performance......With the objective to be able to optimize the design and operation of steam boiler concepts Aalborg Industries A/S [1] has together with Aalborg University, Institute of Energy Technology [9] carried out a development project paying special attention to the boiler concept as an integrated unit......, emissions and to obtain long time operation experiences with the boiler concept, a full scale prototype has been built and these tests have been accomplished on the prototype. By applying this integrated unit approach to the boiler concept development it has been possible to optimize the different building...

  9. Chemical cleaning of AGR boilers

    International Nuclear Information System (INIS)

    Moore, S.V.; Moore, W.; Rantell, A.

    1978-01-01

    AGR boilers are likely to require post service chemical cleaning to remove accumulated oxides at intervals of 15 - 35 kh. The need to clean will be based on an assessment of such factors as the development of flow imbalances through parallel tubes induced by the formation of rough oxide surfaces, an increasing risk of localised corrosion as the growth of porous oxides proceeds and the risk of tube blockage caused by the exfoliation of steam-grown oxides. The study has shown what heterogeneous multilayer oxides possessing a range of physical and chemical properties form on the alloy steels. They include porous and compact magnetites, chromium spinels and sesquioxide. Ammoniated citric acid has been shown to remove deposited and water-grown magnetites from the carbon and alloy steels but will not necessarily remove the substituted spinels grown on the alloy steels or the potentially spalling steam-grown magnetite on the A1SI 316 superheater. Citric acid supplemented with the reducing agent glyoxal completely removes all oxides from the boiler except the protective inner spinel formed on the 316. Removal of the spinels and compact magnetites occurs more by undercutting and physical detachment than by the dissolution. (author)

  10. Chemical cleaning of UK AGR boilers

    International Nuclear Information System (INIS)

    Rudge, A.; Turner, P.; Ghosh, A.; Clary, W.; Tice, D.

    2002-01-01

    For the first time in their operational lives, UK advanced gas-cooled reactor once-through boilers have been chemically cleaned. Chemical cleaning was necessary to avoid lost output resulting from boiler pressure drops, which had been increasing for a number of years. Chemical cleaning of these boilers presents a number of unique difficulties. These include lack of access to the boilers, highly sensitised 316H superheater sections that cannot be excluded from the cleaning flow path, relatively thin boiler tube walls and an intolerance to boiler tube failure because of the role of the boilers in nuclear decay heat removal. The difficulties were overcome by implementing the clean in a staged manner, starting with an extensive materials testwork programme to select and then to substantiate the cleaning process. The selected process was based on ammoniated citric acid plus formic acid for the principal acid cleaning stage. Materials testwork was followed by an in-plant trial clean of six boiler tubes, further materials testwork and the clean of a boiler tube in a full-scale test rig. An overview is presented of the work that was carried out to demonstrate that the clean could be carried out safely, effectively and without leading to unacceptable corrosion losses. Full-scale chemical cleaning was implemented by using as much of the existing plant as possible. Careful control and monitoring was employed to ensure that the cleaning was implemented according to the specified design, thus ensuring that a safe and effective clean was carried out. Full-scale cleaning has resulted in significant boiler pressure drop recovery, even though the iron burden was relatively low and cleaning was completed in a short time. (orig.)

  11. 46 CFR 61.05-15 - Boiler mountings and attachments.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Boiler mountings and attachments. 61.05-15 Section 61.05... TESTS AND INSPECTIONS Tests and Inspections of Boilers § 61.05-15 Boiler mountings and attachments. (a....05-10. (b) Each stud or bolt for each boiler mounting that paragraph (c) of this section requires to...

  12. 46 CFR 63.25-7 - Exhaust gas boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Exhaust gas boilers. 63.25-7 Section 63.25-7 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) MARINE ENGINEERING AUTOMATIC AUXILIARY BOILERS Requirements for Specific Types of Automatic Auxiliary Boilers § 63.25-7 Exhaust gas boilers. (a) Construction...

  13. 49 CFR 230.30 - Lap-joint seam boilers.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Lap-joint seam boilers. 230.30 Section 230.30..., DEPARTMENT OF TRANSPORTATION STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS Boilers and Appurtenances Inspection and Repair § 230.30 Lap-joint seam boilers. Every boiler having lap-joint longitudinal seams...

  14. Electrical design requirements for electrode boilers for nuclear plants

    International Nuclear Information System (INIS)

    Kempker, M.J.

    1979-01-01

    Medium-voltage steam electrode boilers, in the 20- to 50-MW range, have become an attractive alternative to comparable fossil-fueled boilers as a source of auxiliary steam during the startup and normal shutdown of nuclear power plants. The electrode boiler represents a favorable option because of environmental, fire protection, and licensing considerations. However, this electrical option brings some difficult design problems for which solutions are required in order to integrate the electrode boiler into the plant low resistance grounded power system. These considerations include the effects of an unbalanced electrode boiler on the performance of polyphase induction motors, boiler grounding for personnel safety, boiler neutral grounding, and ground relaying

  15. Environmental performance assessment of utility boiler energy conversion systems

    International Nuclear Information System (INIS)

    Li, Changchun; Gillum, Craig; Toupin, Kevin; Park, Young Ho; Donaldson, Burl

    2016-01-01

    Highlights: • Sustainability analyses of utility boilers are performed. • Natural gas fired boilers have the least CO_2 emissions in fossil fueled boilers. • Solar boilers rank last with an emergy yield ratio of 1.2. • Biomass boilers have the best emergy sustainability index. - Abstract: A significant amount of global electric power generation is produced from the combustion of fossil fuels. Steam boilers are one of the most important components for steam and electricity production. The objective of this paper is to establish a theoretical framework for the sustainability analysis of a utility boiler. These analyses can be used by decision-makers to diagnose and optimize the sustainability of a utility boiler. Seven utility boiler systems are analyzed using energy and embodied solar energy (emergy) principles in order to evaluate their environmental efficiencies. They include a subcritical coal fired boiler, a supercritical coal fired boiler, an oil fired boiler, a natural gas fired boiler, a concentrating solar power boiler utilizing a tower configuration, a biomass boiler, and a refuse derived fuel boiler. Their relative environmental impacts were compared. The results show that the natural gas boiler has significantly lower CO_2 emission than an equivalent coal or oil fired boiler. The refuse derived fuel boiler has about the same CO_2 emissions as the natural gas boiler. The emergy sustainability index of a utility boiler system is determined as the measure of its sustainability from an environmental perspective. Our analyses results indicate that the natural gas boiler has a relatively high emergy sustainability index compared to other fossil fuel boilers. Converting existing coal boilers to natural gas boilers is a feasible option to achieve better sustainability. The results also show that the biomass boiler has the best emergy sustainability index and it will remain a means to utilize the renewable energy within the Rankine steam cycle. Before

  16. Chemical cleaning of UK AGR boilers

    International Nuclear Information System (INIS)

    Rudge, A.; Turner, P.; Ghosh, S.; Clary, W.; Tice, D.R.

    2002-01-01

    For a number of years, the waterside pressure drops across the advanced gas-cooled reactor (AGR) pod boilers have been increasing. The pressure drop increases have accelerated with time, which is the converse behaviour to that expected for rippled magnetite formation (rapid initial increase slowing down with time). Nonetheless, magnetite deposition remains the most likely cause for the increasing boiler resistances. A number of potential countermeasures have been considered in response to the boiler pressure drop increases. However, there was no detectable reduction in the rate of pressure drop increase. Chemical cleaning was therefore considered and a project to substantiate and then implement chemical cleaning was initiated. (authors)

  17. Vigilancia sanitaria de cianobacterias en aguas de consumo humano y aguas de baño

    Directory of Open Access Journals (Sweden)

    Guadalupe Martínez Juárez

    2008-06-01

    Full Text Available Las autoridades de Salud Pública tienen implantados y consolidados programas de vigilancia sanitaria de aguas de consumo humano y aguas de baño, cuya finalidad es evitar riesgos para la salud de la población que consume agua o que utiliza con fines recreativos zonas de baño continentales. A la luz de los conocimientos científicos actuales, la proliferación de cianobacterias es un nuevo riesgo, que es necesario tener en cuenta en los programas de protección de la salud. En el presente trabajo, cuyo principal objetivo es conocer la presencia de cianobacterias y microcistinas en aguas utilizadas para consumo humano y baño, se muestran los resultados obtenidos en los programas de vigilancia llevados a cabo en el Área de Salud de Talavera de la Reina en los últimos cuatro años. Se ha realizado un estudio descriptivo de la presencia de cianobacterias y microcistinas, en agua bruta de la captación de dos embalses y en agua tratada a la salida de dos plantas de tratamiento de agua potable. Esto mismo se ha estudiado en otros dos embalses utilizados para baño en época estival. Para ello se han efectuado muestreos quincenales y posterior identificación y recuento de cianobacterias y determinación de microcistinas disueltas en agua mediante técnica ELISA.De los resultados de la vigilancia de aguas de consumo humano, se concluye que los valores de microcistinas detectados en los embalses no son elevados, apareciendo en menos del 6% de los muestreos efectuados y que el tratamiento aplicado en las plantas de tratamiento de agua potable, es eficaz para su eliminación. De la vigilancia de cianobacterias en el agua de baño, se concluye que a lo largo de tres temporadas, en el 48% de los muestreos realizados en las dos zonas de baño del área, se han superado las 100.000 células/ml, valor guía dado por la OMS, para valorar probabilidad moderada de efectos adversos en bañistas.Destacar que es necesario disponer de datos sobre exposición a

  18. Treatment of Berkeley boilers in Studsvik. Project description and experiences - Berkeley Boilers Project

    International Nuclear Information System (INIS)

    Saul, Dave; Davidson, Gavin; Wirendal, Bo

    2014-01-01

    In November 2011 Studsvik was awarded a contract to transport five decommissioned boilers from the Berkeley Nuclear Licensed Site in the UK to the Studsvik Nuclear Site in Sweden for metal treatment and recycling. A key objective of the project was to remove the boilers from the site by 31 March 2012 and this was successfully achieved with all boilers off site by 22 March and delivered to Studsvik on 6 April. In November 2012 Studsvik was awarded a further contract for the remaining ten Berkeley Boilers with the requirement to remove all boilers from the Berkeley site by 31 March 2013. Again this was successfully achieved ahead of programme with all boilers in Sweden by 1 April 2013. A total of nine boilers have now been processed and all remaining boilers will be completed by end of September 2014. The projects have had many challenges including a very tight timescale and both have been successfully delivered to cost and ahead of the baseline programme. This paper describes the project and the experience gained from treatment of the boilers to date. (authors)

  19. Multi-pressure boiler thermodynamics analysis code

    International Nuclear Information System (INIS)

    Lorenzoni, G.

    1992-01-01

    A new method and the relative FORTRAN program for the thermodynamics design analysis of a multipressure boiler are reported. This method permits the thermodynamics design optimization with regard to total exergy production and a preliminary costs

  20. New thinking for the boiler room.

    Science.gov (United States)

    Rose, Wayne

    2008-09-01

    Wayne Rose, marketing manager at integrated plant room manufacturer Armstrong Integrated Systems, explains how increasing use of off-site manufacture, the latest 3D modelling technology, and advances in control technology, are revolutionising boiler room design and construction.

  1. Modelling and simulating fire tube boiler performance

    DEFF Research Database (Denmark)

    Sørensen, K.; Condra, T.; Houbak, Niels

    2003-01-01

    A model for a flue gas boiler covering the flue gas and the water-/steam side has been formulated. The model has been formulated as a number of sub models that are merged into an overall model for the complete boiler. Sub models have been defined for the furnace, the convection zone (split in 2......: a zone submerged in water and a zone covered by steam), a model for the material in the boiler (the steel) and 2 models for resp. the water/steam zone (the boiling) and the steam. The dynamic model has been developed as a number of Differential-Algebraic-Equation system (DAE). Subsequently Mat......Lab/Simulink has been applied for carrying out the simulations. To be able to verify the simulated results experiments has been carried out on a full scale boiler plant....

  2. Pirotubular boilers design. Diseno de calderas pirotubulares

    Energy Technology Data Exchange (ETDEWEB)

    Latre Durso, F. (Geval S.A. (Spain))

    1994-01-01

    This article describes the conceptual design of Pirotubular boilers from the valuable thermal point of view, to the dimensional. This topic is a very tool valuable for professionals of design and for maintenance and operation equipment.

  3. Water side corrosion prevention in boilers

    International Nuclear Information System (INIS)

    Zeid, A.

    1993-01-01

    Corrosion may be defined as a naturally occurring physical and chemical deterioration of a material due to reaction with the environment or surrounding atmosphere. In boilers the material is subjected on both sides to two different media which may cause severe corrosion. At the water side the content of O 2 considered one of the principal factors which determine the extent of corrosion in the boiler tubes. This paper deals with certain conditions that result in the increase of O 2 in the boiler water and hence increase the corrosion rate, to minimize the effect of these conditions a chemical treatment was carried out the results obtained indicated the success of the treatment procedure in corrosion prevention and boiler material protection. The treatment is traditional. But the study indicates how a simple mean could be applied to solve a serious problem. 4 tab

  4. aguas residuales en la guajira (Colombia

    Directory of Open Access Journals (Sweden)

    Camilo Madariaga

    2005-01-01

    Full Text Available Este estudio muestra la descripción de los resultados del componente social y comunicacional del proyecto sobre el desarrollo e implementación de modelos matemáticos para la representación del comportamiento de plantas de tratamiento de aguas residuales en los quince (15 municipios del departamento de La Guajira (Colombia. Con los problemas de escasez de agua se ha empezado a prestar gran atención a un recurso cercano, concentrado y cuya calidad es relativamente constante y conocida: el agua residual. Los resultados mostraron la falta de conocimiento por parte de casi todos los actores sociales con respecto al estado, proceso, planificación y ejecución de trabajo con el sistema de agua. Asimismo, en cuanto a la posibilidad de reutilización de aguas servidas después de un procedimiento de tratamiento adecuado en las lagunas de estabilización, éstas no tienen las condiciones estructurales para el trabajo de tratamiento y la comunidad en general desconoce su existencia.

  5. Catalytic burners in larger boiler appliances

    Energy Technology Data Exchange (ETDEWEB)

    Silversand, Fredrik; Persson, Mikael (Catator AB, Lund (Sweden))

    2009-02-15

    This project focuses on the scale up of a Catator's catalytic burner technology to enable retrofit installation in existing boilers and the design of new innovative combinations of catalytic burners and boilers. Different design approaches are discussed and evaluated in the report and suggestions are made concerning scale-up. Preliminary test data, extracted from a large boiler installation are discussed together with an accurate analysis of technical possibilities following an optimization of the boiler design to benefit from the advantages of catalytic combustion. The experimental work was conducted in close collaboration with ICI Caldaie (ICI), located in Verona, Italy. ICI is a leading European boiler manufacturer in the effect segment ranging from about 20 kWt to several MWt. The study shows that it is possibly to scale up the burner technology and to maintain low emissions. The boilers used in the study were designed around conventional combustion and were consequently not optimized for implementation of catalytic burners. From previous experiences it stands clear that the furnace volume can be dramatically decreased when applying catalytic combustion. In flame combustion, this volume is normally dimensioned to avoid flame impingement on cold surfaces and to facilitate completion of the gas-phase reactions. The emissions of nitrogen oxides can be reduced by decreasing the residence time in the furnace. Even with the over-dimensioned furnace used in this study, we easily reached emission values close to 35 mg/kWh. The emissions of carbon monoxide and unburned hydrocarbons were negligible (less than 5 ppmv). It is possible to decrease the emissions of nitrogen oxides further by designing the furnace/boiler around the catalytic burner, as suggested in the report. Simultaneously, the size of the boiler installation can be reduced greatly, which also will result in material savings, i.e. the production cost can be reduced. It is suggested to optimize the

  6. Boiler burden reduced at Bedford site.

    Science.gov (United States)

    Horsley, Chris

    2011-10-01

    With the NHS aiming to reduce its 2007 carbon footprint by 10% by 2015, Chris Horsley, managing director of Babcock Wanson UK, a provider of industrial boilers and burners, thermal oxidisers, air treatment, water treatment, and associated services, looks at how one NHS Trust has approached the challenge, and considerably reduced its carbon emissions, by refurbishing its boiler house and moving from oil to gas-fired steam generation.

  7. Ecological boiler modernization, feasible energy solutions

    International Nuclear Information System (INIS)

    Krcek, F.; Matev, M.; Sykora, J.; Chladek, J.

    2005-01-01

    Alstom Power, s.r.o., ALSTOM GROUP in Brno, Czech Republic is a successor of PBS (First Brno Machine Works). PBS was a well-known company in Bulgaria - mainly as Heating Power Plant (HPP) and Industrial Plant supplier of boilers, industrial steam turbines, milling systems, heat exchangers Btc. PBS has been privatised in two stages starting at1993 year. Alstom recently deals with boiler and heat exchanger products. Industrial turbine but has been sold to Siemens in 2004

  8. Gas fired boilers and atmospheric pollution

    International Nuclear Information System (INIS)

    Chiaranello, J.M.

    1991-01-01

    A general analysis concerning atmospheric pollution is presented: chemical composition and vertical distribution of atmosphere and pollutants, chemical reactions, ozone destruction and production cycles, COx, NOx and SOx pollutions. The gas fired boiler number and repartition in France are presented and the associated pollution is analyzed (CO2, CO, NOx) and quantified. Various pollution control technics concerning gas fired boiler pollutants are described and a pollution criterion for clean gas fired generators is proposed

  9. Assessment of physical workload in boiler operations.

    Science.gov (United States)

    Rodrigues, Valéria Antônia Justino; Braga, Camila Soares; Campos, Julio César Costa; Souza, Amaury Paulo de; Minette, Luciano José; Sensato, Guilherme Luciano; Moraes, Angelo Casali de; Silva, Emília Pio da

    2012-01-01

    The use of boiler wood-fired is fairly common equipment utilized in steam generation for energy production in small industries. The boiler activities are considered dangerous and heavy, mainly due to risks of explosions and the lack of mechanization of the process. This study assessed the burden of physical labor that operators of boilers are subjected during the workday. Assessment of these conditions was carried out through quantitative and qualitative measurements. A heart rate monitor, a wet-bulb globe thermometer (WBGT), a tape-measure and a digital infrared camera were the instruments used to collect the quantitative data. The Nordic Questionnaire and the Painful Areas Diagram were used to relate the health problems of the boiler operator with activity. With study, was concluded that the boiler activity may cause pains in the body of intensity different, muscle fatigue and diseases due to excessive weight and the exposure to heat. The research contributed to improve the boiler operator's workplace and working conditions.

  10. Increasing the thermal efficiency of boiler plant

    Directory of Open Access Journals (Sweden)

    Uyanchinov Evgeniy

    2017-01-01

    Full Text Available The thermal efficiency increase of boiler plant is actual task of scientific and technical researches. The optimization of boiler operating conditions is task complex, which determine by most probable average load of boiler, operating time and characteristics of the auxiliary equipment. The work purpose – the determination of thermodynamic efficiency increase ways for boiler plant with a gas-tube boiler. The tasks, solved at the research are the calculation of heat and fuel demand, the exergetic analysis of boilerhouse and heat network equipment, the determination of hydraulic losses and exergy losses due to restriction. The calculation was shown that the exergy destruction can be reduced by 2.39% due to excess air reducing to 10%; in addition the oxygen enrichment of air can be used that leads to reducing of the exergy destruction rate. The processes of carbon deposition from the side of flame and processes of scale formation on the water side leads to about 4.58% losses of fuel energy at gas-tube boiler. It was shown that the exergy losses may be reduced by 2.31% due to stack gases temperature reducing to 148 °C.

  11. Vigilancia sanitaria de cianobacterias en aguas de consumo humano y aguas de baño

    OpenAIRE

    Guadalupe Martínez Juárez; Idoia Merino Azcue

    2008-01-01

    Las autoridades de Salud Pública tienen implantados y consolidados programas de vigilancia sanitaria de aguas de consumo humano y aguas de baño, cuya finalidad es evitar riesgos para la salud de la población que consume agua o que utiliza con fines recreativos zonas de baño continentales. A la luz de los conocimientos científicos actuales, la proliferación de cianobacterias es un nuevo riesgo, que es necesario tener en cuenta en los programas de protección de la salud. En el presente trabajo,...

  12. Potencial y plan exportador agua mineral BE

    OpenAIRE

    López Rodríguez, Diana Carolina; Rojas Isaza, Alejandro

    2012-01-01

    Agua Mineral BE Ltda es una empresa dedicada a la extracción, embotellado y comercialización de agua mineral colombiana, originada en las cordilleras de los Andes. Se caracteriza por ser de alta pureza y ser una bebida funcional, que trae beneficios adicionales a la salud por su composición de minerales, oligoelementos y electrolitos. Las condiciones de la empresa resultaron ser muy atractivas para desarrollar una investigación, por otro lado, el dueño y gerente general mostro gran interés en...

  13. Trihalometanos en aguas de consumo humano

    OpenAIRE

    C Hernández Sánchez; Luis González G; Rubio Armendáriz C; JM Caballero Mesa; N Ben-Charki El-Mousati; A Hardisson de la Torre

    2011-01-01

    Los trihalometanos (THMs) son subproductos de desinfección que resultan de la cloración de las aguas. Los THMs engloban a sustancias como el cloroformo (CHCl ), el 3 bromodiclorometano (CHBrCl ), el clorodibromometano (CHBr Cl) 2 2 y el tribromometano (CHBr ). La Agencia Internacional para la 3 Investigación del Cáncer ha clasificado al cloroformo y al bromodiclorometano en el grupo 2B que incluye a las sustancias posiblemente carcinogénicas en humanos. Debido a su toxicidad y a que el agua d...

  14. Riego subsuperficial con aguas residuales tratadas

    OpenAIRE

    Crespi, Raúl; Camacho, Emilio; Polo, María José

    2009-01-01

    La reutilización de aguas residuales tratadas para riego por goteo subsuperficial (RGS) de cultivos extensivos, es una práctica reconocida mundialmente, siendo la obturación de emisores un serio problema en la operación de estos sistemas. Durante el ciclo agrícola 2002/03, se realizó un ensayo experimental usando dos tipos de agua: limpia (AL) y residual tratada (AR) en un sistema mixto combinando un reactor biológico con laguna de maduración y tres tipos de protectores del emisor: micro dosi...

  15. Pelly Crossing wood chip boiler

    Energy Technology Data Exchange (ETDEWEB)

    1985-03-11

    The Pelly wood chip project has demonstrated that wood chips are a successful fuel for space and domestic water heating in a northern climate. Pelly Crossing was chosen as a demonstration site for the following reasons: its extreme temperatures, an abundant local supply of resource material, the high cost of fuel oil heating and a lack of local employment. The major obstacle to the smooth operation of the boiler system was the poor quality of the chip supply. The production of poor quality chips has been caused by inadequate operation and maintenance of the chipper. Dull knives and faulty anvil adjustments produced chips and splinters far in excess of the one centimetre size specified for the system's design. Unanticipated complications have caused costs of the system to be higher than expected by approximately $15,000. The actual cost of the project was approximately $165,000. The first year of the system's operation was expected to accrue $11,600 in heating cost savings. This estimate was impossible to confirm given the system's irregular operation and incremental costs. Consistent operation of the system for a period of at least one year plus the installation of monitoring devices will allow the cost effectiveness to be calculated. The wood chip system's impact on the environment was estimated to be minimal. Wood chip burning was considered cleaner and safer than cordwood burning. 9 refs., 6 figs., 6 tabs.

  16. Tratamiento biológico de aguas residuales industriales

    OpenAIRE

    Lobo, Cintia Cecilia

    2014-01-01

    A nivel mundial la disponibilidad de recursos hídricos constituye un tema de gran preocupación. En la Tierra solo el 2.53% del total de agua corresponde a agua dulce y se estima que solo el 15% del total de aguas residuales de América Latina recibe tratamiento. En Argentina la principal fuente de recursos hídricos son las aguas superficiales que representan un 80% del total de disponibilidad de agua; dentro de ellas se destaca la Cuenca del Plata que representa un 34% de la superfi...

  17. "Zaragoza,ciudad ahorradora de agua"

    Directory of Open Access Journals (Sweden)

    Viñuales Edo, Victor

    2000-02-01

    Full Text Available In the year before the project was initiated, 11 million Spaniards were undergoing daily water restrictions. There were serious inter-regional conflicts over this scarce commodity. There seemed to be only one solution: more reservoirs and more water trans-shipments, what means high costs and harm to the environment. In Zaragoza, a city of 700.000 inhabitants in the north -cast of Spain, as in other cities in Spain, a triple paradox was to emerge: rainfall was scarce and irregular. water was cheap, and it was being misused. February 1997 saw the beginning of the "Zaragoza, the water-saving city" project. This aimed to promote a new water-saving consciousness through a more efficient management of this resource. It emphasised, above all, the importance of simple technological change to achieve a sustainable reduction in water consumption. The project was to issue a challenge to the city: to save 1.000 million litres of domestic water consumption in one year The project has shown that it is possible to deal with the shortage of water incities, using a cheap, ecological, fast and contentious-free app roach, by increasing efficiency in consumption. The most important lesson to be learnt is that the shared responsibility between the main players (manufacturers, retailers, consumers, distributors. plumbers, etc. has managed to create a new synergy which favours water-use efficiency. 1176 million litres of water have been saved. Spanish cities now have a successful model to follow for the most ecologically-so und method of facing up to the next drought.EI año anterior al inicio del proyecto, 11 millones de españoles sufrieron restricciones diarias de agua. Los conflictos entre regiones por el agua escasa fueron muy graves. Parecía que solo había una solución: mas pantanos y mas trasvases. Y su consecuencia inevitable: inversiones multintillonarias, daños al medio ambiente, larguisimos plazos de ejecución. En Zaragoza, ciudad del nordeste de Espa

  18. Administración del agua. - Capítulo VII: Aprovechamiento de las aguas

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  19. Boiler house modernization through shared savings program

    Energy Technology Data Exchange (ETDEWEB)

    Breault, R.W. [Tecogen, Waltham, MA (United States)

    1995-12-31

    Throughout Poland as well as the rest of Eastern Europe, communities and industries rely on small heat only boilers to provide district and process heat. Together these two sectors produce about 85,000 MW from boilers in the 2 to 35 MW size range. The bulk of these units were installed prior to 1992 and must be completely overhauled to meet the emission regulations which will be coming into effect on January 1, 1998. Since the only practical fuel is coal in most cases, these boilers must be either retrofit with emission control technology or be replaced entirely. The question that arises is how to accomplish this given the current tight control of capital in Poland and other East European countries. A solution that we have for this problem is shared savings. These boilers are typically operating with a quiet low efficiency as compared to western standards and with excessive manual labor. Installing modernization equipment to improve the efficiency and to automate the process provides savings. ECOGY provides the funds for the modernization to improve the efficiency, add automation and install emission control equipment. The savings that are generated during the operation of the modernized boiler system are split between the client company and ECOGY for a number of years and then the system is turned over in entirety to the client. Depending on the operating capacity, the shared savings agreement will usually span 6 to 10 years.

  20. The load structure of electro boilers

    International Nuclear Information System (INIS)

    Feilberg, N.; Livik, K.

    1995-01-01

    Load measurements have been performed on 24 electro boilers with a time resolution of one hour throughout a period of one year. The boilers are used for space heating and heating of tap water in office buildings, shopping centres and apartment buildings. All boilers have tariffs with disconnection agreements. This report presents load analyses of the measurements from each boiler, and typical load profiles are calculated and presented. It also analyses how boilers are used in relation to the outdoor temperature and the power price on the spot market. All the measurements are performed in Bergen, Norway, in the period August 1993 - August 1994. Typical load profiles are shown, both annual and daily, as well as specific load parameters in addition to key figures used in calculating the total power load on the distribution network. The climate impact on energy and power load is evaluated. The report also shows examples of how the results may be applied in various special fields. 8 figs., 9 tabs

  1. Increasing the efficiency of the condensing boiler

    Science.gov (United States)

    Zaytsev, ON; Lapina, EA

    2017-11-01

    Analysis of existing designs of boilers with low power consumption showed that the low efficiency of the latter is due to the fact that they work in most cases when the heating period in the power range is significantly less than the nominal power. At the same time, condensing boilers do not work in the most optimal mode (in condensing mode) in the central part of Russia, a significant part of their total operating time during the heating season. This is due to existing methods of equipment selection and joint operation with heating systems with quantitative control of the coolant. It was also revealed that for the efficient operation of the heating system, it is necessary to reduce the inertia of the heat generating equipment. Theoretical patterns of thermal processes in the furnace during combustion gas at different radiating surfaces location schemes considering the influence of the very furnace configuration, characterized in that to reduce the work condensing boiler in conventional gas boiler operation is necessary to maintain a higher temperature in the furnace (in the part where spiral heat exchangers are disposed), which is possible when redistributing heat flow - increase the proportion of radiant heat from the secondary burner emitter allow Perey For the operation of the condensing boiler in the design (condensation) mode practically the entire heating period.

  2. Ultrasonic boiler inspection and economic analysis guidelines

    International Nuclear Information System (INIS)

    Anon.

    1987-01-01

    Boiler tube failures cause approximately 6% availability loss of large fossil-fired power generating plants. This loss can be reduced by systematic approaches using ultrasonic examination and root cause failure analysis methods. Two projects sponsored by EPRI have provided utility engineers with guidelines for performing ultrasonic examinations and with details on 22 types of tube failure mechanisms. A manual has been published that provides descriptions of typical locations, superficial appearances, damage mechanisms, metallurgy, microstructural changes, likely root causes, and potential corrective actions. Application of the principles in the manual is being demonstrated in an EPRI-funded project at 10 electric utilities over the next two years. Guidelines have been published that prescribe the activities necessary for ultrasonic examinations of boiler tubes. Eight essential elements of a boiler examination should be performed to assure that possible economic benefits are obtained. Work was supported by EPRI under RP 1890 and RP 1865. A software package has been developed for effectively planning inspections for wall thinning in fossil-fired boiler tubing. The software assists in minimizing costs associated with maintenance, such as inspection and repair, while the life of the boiler is maximized

  3. 46 CFR 52.25-5 - Miniature boilers (modifies PMB-1 through PMB-21).

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Miniature boilers (modifies PMB-1 through PMB-21). 52.25... ENGINEERING POWER BOILERS Other Boiler Types § 52.25-5 Miniature boilers (modifies PMB-1 through PMB-21). Miniature boilers must meet the applicable provisions in this part for the boiler type involved and the...

  4. Evaluation of thermal overload in boiler operators.

    Science.gov (United States)

    Braga, Camila Soares; Rodrigues, Valéria Antônia Justino; Campos, Julio César Costa; de Souza, Amaury Paulo; Minette, Luciano José; de Moraes, Angêlo Casali; Sensato, Guilherme Luciano

    2012-01-01

    The Brazilians educational institutions need a large energy demand for the operation of laundries, restaurants and accommodation of students. Much of that energy comes from steam generated in boilers with wood fuel. The laboral activity in boiler may present problems for the operator's health due to exposure to excessive heat, and its operation has a high degree of risk. This paper describes an analysis made the conditions of thermal environment in the operation of a B category boiler, located at a Higher Education Institution, located in the Zona da Mata Mineira The equipments used to collect data were Meter WBGT of the Heat Index; Meter of Wet Bulb Index and Globe Thermometer (WBGT); Politeste Instruments, an anemometer and an Infrared Thermometer. By the application of questionnaires, the second phase consisted of collecting data on environmental factors (temperature natural environment, globe temperature, relative humidity and air velocity). The study concluded that during the period evaluated, the activity had thermal overload.

  5. 46 CFR 61.05-20 - Boiler safety valves.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Boiler safety valves. 61.05-20 Section 61.05-20 Shipping... INSPECTIONS Tests and Inspections of Boilers § 61.05-20 Boiler safety valves. Each safety valve for a drum, superheater, or reheater of a boiler shall be tested at the interval specified by table 61.05-10. [CGD 95-028...

  6. Computer simulation of the fire-tube boiler hydrodynamics

    Directory of Open Access Journals (Sweden)

    Khaustov Sergei A.

    2015-01-01

    Full Text Available Finite element method was used for simulating the hydrodynamics of fire-tube boiler with the ANSYS Fluent 12.1.4 engineering simulation software. Hydrodynamic structure and volumetric temperature distribution were calculated. The results are presented in graphical form. Complete geometric model of the fire-tube boiler based on boiler drawings was considered. Obtained results are suitable for qualitative analysis of hydrodynamics and singularities identification in fire-tube boiler water shell.

  7. Application of GPRS and GIS in Boiler Remote Monitoring System

    OpenAIRE

    Hongchao Wang; Yifeng Wu

    2012-01-01

    Application of GPRS and GIS in boiler remote monitoring system was designed in this paper by combining the advantage of GPRS and GIS in remote data transmission with configuration monitoring technology. The detail information of the operating conditions of the industrial boiler can be viewed by marking the location of boiler on the electronic map dynamically which can realize the unified management for industrial boiler of a region or city conveniently. Experimental application show that the ...

  8. Condensing boiler applications in the process industry

    International Nuclear Information System (INIS)

    Chen, Qun; Finney, Karen; Li, Hanning; Zhang, Xiaohui; Zhou, Jue; Sharifi, Vida; Swithenbank, Jim

    2012-01-01

    Major challenging issues such as climate change, energy prices and fuel security have focussed the attention of process industries on their energy efficiency and opportunities for improvement. The main objective of this research study was to investigate technologies needed to exploit the large amount of low grade heat available from a flue gas condensing system through industrial condensing boilers. The technology and application of industrial condensing boilers in various heating systems were extensively reviewed. As the condensers require site-specific engineering design, a case study was carried out to investigate the feasibility (technically and economically) of applying condensing boilers in a large scale district heating system (40 MW). The study showed that by recovering the latent heat of water vapour in the flue gas through condensing boilers, the whole heating system could achieve significantly higher efficiency levels than conventional boilers. In addition to waste heat recovery, condensing boilers can also be optimised for emission abatement, especially for particle removal. Two technical barriers for the condensing boiler application are corrosion and return water temperatures. Highly corrosion-resistant material is required for condensing boiler manufacture. The thermal design of a 'case study' single pass shell-and-tube condensing heat exchanger/condenser showed that a considerable amount of thermal resistance was on the shell-side. Based on the case study calculations, approximately 4900 m 2 of total heat transfer area was required, if stainless steel was used as a construction material. If the heat transfer area was made of carbon steel, then polypropylene could be used as the corrosion-resistant coating material outside the tubes. The addition of polypropylene coating increased the tube wall thermal resistance, hence the required heat transfer area was approximately 5800 m 2 . Net Present Value (NPV) calculations showed that the choice of a carbon

  9. Control Properties of Bottom Fired Marine Boilers

    DEFF Research Database (Denmark)

    Solberg, Brian; Andersen, Palle; Karstensen, Claus M. S.

    2005-01-01

    This paper focuses on model analysis of a dynamic model of a bottom fired one-pass smoke tube boiler. Linearised versions of the model are analysed to determine how gain, time constants and right half plane zeros (caused by the shrink-and-swell phenomenon) depend on the steam flow load. Furthermore...... the interactions in the system are inspected to analyse potential benefit from using a multivariable control strategy in favour of the current strategy based on single loop theory. An analysis of the nonlinear model is carried out to further determine the nonlinear characteristics of the boiler system...

  10. Developing trends with boiler operation and management

    Energy Technology Data Exchange (ETDEWEB)

    Stark, J.M. [Occupational Safety and Health Service, Wellington (New Zealand). Dept. of Labour, Engineering Safety Branch

    1993-12-31

    Over recent years there have been many improvements in boiler control and safety management systems. Technology has made major advances and is now regarded as being well proven in Australia, Europe and the United Kingdom and these changes have been examined by a project committee, convened for the purpose, to establish whether they are equally applicable in New Zealand. The result of the committee`s findings and experience is contained in the `Draft Code of Practice`. This paper explains the development of the `Code of Practice`, the reasoning behind some of the decisions taken and the implications of these changes to boiler owners.

  11. Optimal load allocation of multiple fuel boilers.

    Science.gov (United States)

    Dunn, Alex C; Du, Yan Yi

    2009-04-01

    This paper presents a new methodology for optimally allocating a set of multiple industrial boilers that each simultaneously consumes multiple fuel types. Unlike recent similar approaches in the utility industry that use soft computing techniques, this approach is based on a second-order gradient search method that is easy to implement without any specialized optimization software. The algorithm converges rapidly and the application yields significant savings benefits, up to 3% of the overall operating cost of industrial boiler systems in the examples given and potentially higher in other cases, depending on the plant circumstances. Given today's energy prices, this can yield significant savings benefits to manufacturers that raise steam for plant operations.

  12. Firewood boiler operators and heat exposure

    Directory of Open Access Journals (Sweden)

    Vilson Bernardo Stollmeier

    2017-12-01

    Full Text Available This article presents an analysis of heat exposure work in boiler industry wood from a company in the industrial sector, focusing on the analysis of the environmental burden of the activity. Therefore, the methodological procedures consisted of document analysis, interviews, filming, evaluation problems of the effects of the hot environment and its prevention. The results show that the fuel to the boiler operators are exposed to heat and need guidance on their daily activities with prevention of diseases affected by excessive heat. Are also suggested training in technical and health to improve working conditions and the operator's health.

  13. Boiler inspection manipulator for Torness Power Station

    International Nuclear Information System (INIS)

    Carrey, R.T.A.; Yule, I.Y.; Sibson, S.; Playle, M.J.

    1996-01-01

    The Advanced Gas-cooled Reactors at Torness and Heysham 2 are provided with dedicated access for remote inspection equipment. These in-service inspection (ISI) accesses comprise 12 penetrations above the core for inspection of the above core area and boilers, 12 below core penetrations for inspection of the lower boiler area and access through any of the 8 gas circulator penetrations for inspection of the sub-diagrid area. This paper describes a manipulator which will access the reactor from above the core via any of the 8 peripheral penetrations. (UK)

  14. TA-2 Water Boiler Reactor Decommissioning Project

    International Nuclear Information System (INIS)

    Durbin, M.E.; Montoya, G.M.

    1991-06-01

    This final report addresses the Phase 2 decommissioning of the Water Boiler Reactor, biological shield, other components within the biological shield, and piping pits in the floor of the reactor building. External structures and underground piping associated with the gaseous effluent (stack) line from Technical Area 2 (TA-2) Water Boiler Reactor were removed in 1985--1986 as Phase 1 of reactor decommissioning. The cost of Phase 2 was approximately $623K. The decommissioning operation produced 173 m 3 of low-level solid radioactive waste and 35 m 3 of mixed waste. 15 refs., 25 figs., 3 tabs

  15. 46 CFR 56.50-30 - Boiler feed piping.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Boiler feed piping. 56.50-30 Section 56.50-30 Shipping... APPURTENANCES Design Requirements Pertaining to Specific Systems § 56.50-30 Boiler feed piping. (a) General... least two separate means of supplying feed water for the boilers. All feed pumps shall be fitted with...

  16. Biomass boiler conversion potential in the eastern United States

    Science.gov (United States)

    Charles D. Ray; Li Ma; Thomas Wilson; Daniel Wilson; Lew McCreery; Janice K. Wiedenbeck

    2013-01-01

    The U.S. is the world's leading consumer of primary energy. A large fraction of this energy is used in boiler installations to generate steam and hot water for heating applications. It is estimated there are total 163,000 industrial and commercial boilers in use in the United States of all sizes. This paper characterizes the commercial and industrial boilers in...

  17. New materials for boilers in USC power plants

    International Nuclear Information System (INIS)

    Hong, Sung Ho; Hong, Seok Joo

    2003-01-01

    The efficiency of boiler in fossil power plants is a strong function of steam temperature and pressure. Thus, the main technology of increasing boiler efficiency is the development of stronger high temperature materials, capable of operating under high stresses at ever increasing temperature. This paper will presents the new material relating to boiler of USC power plant

  18. 46 CFR 176.812 - Pressure vessels and boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Pressure vessels and boilers. 176.812 Section 176.812... TONS) INSPECTION AND CERTIFICATION Material Inspections § 176.812 Pressure vessels and boilers. (a.... (b) Periodic inspection and testing requirements for boilers are contained in § 61.05 in subchapter F...

  19. 46 CFR 115.812 - Pressure vessels and boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Pressure vessels and boilers. 115.812 Section 115.812... CERTIFICATION Material Inspections § 115.812 Pressure vessels and boilers. (a) Pressure vessels must be tested... testing requirements for boilers are contained in § 61.05 in subchapter F of this chapter. [CGD 85-080, 61...

  20. 46 CFR 109.205 - Inspection of boilers and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Inspection of boilers and machinery. 109.205 Section 109... OPERATIONS Tests, Drills, and Inspections § 109.205 Inspection of boilers and machinery. The chief engineer or engineer in charge, before he assumes charge of the boilers and machinery of a unit shall inspect...

  1. 40 CFR 63.988 - Incinerators, boilers, and process heaters.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 10 2010-07-01 2010-07-01 false Incinerators, boilers, and process... Routing to a Fuel Gas System or a Process § 63.988 Incinerators, boilers, and process heaters. (a) Equipment and operating requirements. (1) Owners or operators using incinerators, boilers, or process...

  2. Aspects of new material application for boilers construction

    International Nuclear Information System (INIS)

    Czerniawski, R.

    1996-01-01

    Review of steel types commonly used for energetic boilers construction has been done. The worldwide trends in new materials application for improvement of boilers quality have been discussed. The mechanical properties of boiler construction steels have been shown and compared. 3 refs, 5 figs, 1 tab

  3. Lower price for solar boilers must improve market penetration

    International Nuclear Information System (INIS)

    Koevoet, J.B.J.

    1999-01-01

    The Dutch government aims at 1.7 PJ thermal energy for the year 2007 to be supplied by solar water heaters. For that target the number of installed solar boilers must increase seven times the number of installed solar boilers in 1998. This can be stimulated by a considerable reduction of the market price for such boilers

  4. 10 CFR 431.82 - Definitions concerning commercial packaged boilers.

    Science.gov (United States)

    2010-01-01

    ... gases. Manufacturer of a commercial packaged boiler means any person who manufactures, produces... 10 Energy 3 2010-01-01 2010-01-01 false Definitions concerning commercial packaged boilers. 431.82... COMMERCIAL AND INDUSTRIAL EQUIPMENT Commercial Packaged Boilers § 431.82 Definitions concerning commercial...

  5. 40 CFR 761.71 - High efficiency boilers.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false High efficiency boilers. 761.71... PROHIBITIONS Storage and Disposal § 761.71 High efficiency boilers. (a) To burn mineral oil dielectric fluid containing a PCB concentration of ≥50 ppm, but boiler shall comply with the following...

  6. 49 CFR 230.36 - Hydrostatic testing of boilers.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Hydrostatic testing of boilers. 230.36 Section 230... Appurtenances Pressure Testing of Boilers § 230.36 Hydrostatic testing of boilers. (a) Time of test. The... to any hydrostatic pressure. Hydrostatic testing required by these rules shall be conducted at 25...

  7. Measurement of the Specific Gravity of the Water-Steam Emulsion Flowing in a Screen Tube of an Industrial Boiler Using Sodium-24; Mesure du Poids Specifique de l'Emulsion (Eau-Vapeur) s'Ecoulant dans un Tube-Ecran de Chaudiere Industrielle: Emploi de Sodium-24; ИЗМЕРЕНИЕ УДЕЛЬНОГО ВЕСА ЭМУЛЬСИИ (ВОДА - ПАР), ПРОТЕКАВШЕЙ В ЭКРАНИРУЮЩЕЙ ТРУБЕ ПРОМЫШЛЕННОГО КОТЛА С ПОМОЩЬЮ НАТРИЯ-24; Medicion con Ayuda de Sodio-24 del Peso Especifico de la Emulsion (Agua-Vapor) que Atraviesa la Parrilla de Agua de una Caldera Industrial

    Energy Technology Data Exchange (ETDEWEB)

    Maille, C.; Moinard, J. [Societe Steinet Roubaix, Paris (France); Blanc, D.; Fontan, J. [Faculte des Sciences, Toulouse (France)

    1963-03-15

    The circulation inside an industrial boiler depends cm the flow-rate and on the specific gravity of the water-steam emulsion. Conventional methods for measuring flow-rate in screen tubes require complex devices and may disturb the phenomenon under study. The employment of an external radioactive source and detector for densitometry measurements is simple and in common use. Unfortunately, it is difficult to use in the present case. The authors have therefore developed a method consisting of the introduction of a calculated amount of sodium-24 into the boiler water. This very simple device does not disturb the flow. The experimental design, built up at die test station of Stein and Roubaix Co., is described. Sodium-24 gives consistent results, although less accurate than the densitometric process using an external source of Co{sup 60}. Investigations are now being made on a series of parallel tubes with the geometry, used in industrial boilers. (author) [French] La circulation a l'interieur d'une chaudiere industrielle est conditionnee par la vitesse d'ecoulement et le poids specifique, de l'emulsion (eau - vapeur). Les procedes classiques de mesure de la vitesse d'ecoulement dans les tubes d'ecrans necessitent des montages difficiles et risquent de perturber le phenomene a mesurer. L'emploi d'une source radioactive externe est un procede simple et courant de densimetrie; il est helas difficile a adapter dans le cas actuel. C'est pourquoi les auteurs ont adopte une technique qui consiste a Introduire dans l'eau de la chaudiere une quantite calculee de sodium-24. Ce procede, tres simple, ne perturbe pas l'ecoulement. Les auteurs decrivent le montage experimental realise a la station d'essais de la Societe Stein et Roubaix. La methode du sodium-24 conduit a des resultats coherents, bien que moins precis que le procede densime- trique employant une source externe de MCo. Les etudes en cours concernent une serie de tubes paralleles, disposes selon la geometrie adoptee

  8. Optimization of Boiler Heat Load in Water-Heating Boiler-House

    Directory of Open Access Journals (Sweden)

    B. A. Bayrashevsky

    2009-01-01

    Full Text Available An analytical method for optimization of water-heating boiler loads has been developed on the basis of approximated semi-empirical dependences pertaining to changes of boiler gross efficiency due to its load. A complex (∂tух/∂ξΔξ is determined on the basis of a systematic analysis (monitoring of experimental data and the Y. P. Pecker’s formula for calculation of balance losses q2. This complex makes it possible to set a corresponding correction to a standard value of the boiler gross efficiency due to contamination of heating surfaces.Software means for optimization of water-heating boilers has been developed and it is recommended to be applied under operational conditions.

  9. Estudio de patentes sobre tecnologías para tratamiento de agua y el agua residual

    Directory of Open Access Journals (Sweden)

    Odonel González-Cabrera

    Full Text Available Se presenta un estudio de patentes sobre la temática tratamiento de agua y agua residual. Se localizan y descargan más de 2.500 documentos de patentes relacionados con la temática. Estos se procesan en software al efecto y herramientas de procesamiento. Se extraen indicadores de patentes para esta tecnología con alto valor para actividades comerciales y de investigación, tales como tecnologías emergentes sobre tratamiento de agua, países, entidades e inventores líderes a nivel mundial según el resultado de la tecnología patentada. Se presenta la evolución de las tecnologías de tratamiento del agua y el agua residual en los últimos veinte años a nivel mundial según el registro de las patentes. La entrega de todo el material se realiza enuna herramienta de visualización que logra hacer más atractivo el servicio, tener un producto más amigable y cómodo para el uso, constituyendo una información de alto nivel de actualización y eficacia para la toma de decisiones de una empresa de proyectos e investigaciones hidráulicas.

  10. Control Properties of Bottom Fired Marine Boilers

    DEFF Research Database (Denmark)

    Solberg, Brian; Andersen, Palle; Karstensen, Claus M. S.

    2007-01-01

    This paper focuses on model analysis of a dynamic model of a bottom fired one-pass smoke tube boiler. Linearized versions of the model are analyzed and show large variations in system gains at steady state as function of load whereas gain variations near the desired bandwidth are small. An analys...

  11. Selecting Actuator Configuration for a Benson Boiler

    DEFF Research Database (Denmark)

    Kragelund, Martin Nygaard; Leth, John-Josef; Wisniewski, Rafal

    2009-01-01

    with particular focus on a boiler in a power plant operated by DONG Energy - a Danish energy supplier. The problem has been reformulated using mathematic notions from economics. The selection of actuator configuration has been limited to the fuel system which in the considered plant consists of three different...

  12. Model boiler studies on deposition and corrosion

    International Nuclear Information System (INIS)

    Balakrishnan, P.V.; McVey, E.G.

    1977-09-01

    Deposit formation was studied in a model boiler, with sea-water injections to simulate the in-leakage which could occur from sea-water cooled condensers. When All Volatile Treatment (AVT) was used for chemistry control the deposits consisted of the sea-water salts and corrosion products. With sodium phosphate added to the boiler water, the deposits also contained the phosphates derived from the sea-water salts. The deposits were formed in layers of differing compositions. There was no significant corrosion of the Fe-Ni-Cr alloy boiler tube under deposits, either on the open area of the tube or in crevices. However, carbon steel that formed a crevice around the tube was corroded severely when the boiler water did not contain phosphate. The observed corrosion of carbon steel was caused by the presence of acidic, highly concentrated chloride solution produced from the sea-water within the crevice. Results of theoretical calculations of the composition of the concentrated solution are presented. (author)

  13. Environmental control during steam boiler washing

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Marcio A.B.; Abreu Pereira, Vera L. de [Companhia Petroquimica do Nordeste (COPENE), Camacari, BA (Brazil). Div. de Engenharia Ambiental; Ringler, Ulrich E.S. [PROMON Engenharia Ltda., Salvador, BA (Brazil)

    1993-12-31

    The washing and chemical cleaning of boilers, activities of a high polluting potential, are responsible for the generation of wastewater of high contents of heavy metals, suspended solids and chemical oxygen demand (COD). This paper describes the actions carried out by COPENE - Petroquimica do Nordeste S/A - in order to reduce this problem. (author). 10 refs., 3 figs., 2 tabs.

  14. The investigation of the locomotive boiler material

    International Nuclear Information System (INIS)

    Tucholski, Z.; Wasiak, J.; Bilous, W.; Hajewska, E.

    2006-01-01

    In the paper, the history of narrow-gauge railway system is described. The other information about the steam locomotive construction, as well as the technical regulations of its construction and exploitation are also done. The results of the studies of the locomotive boiler material are presented. (authors)

  15. Coal reburning technology for cyclone boilers

    International Nuclear Information System (INIS)

    Yagiela, A.S.; Maringo, G.J.; Newell, R.J.; Farzan, H.

    1990-01-01

    Babcock and Wilcox has obtained encouraging results from engineering feasibility and pilot-scale proof-of-concept studies of coal reburning for cyclone boiler NO x control. Accordingly, B and W completed negotiations for a clean coal cooperative agreement with the Department of Energy to demonstrate coal reburning technology for cyclone boilers. The host site for the demonstration is the Wisconsin Power and Light (WP and L) Company's 100MWe Nelson Dewey Station. Reburning involves the injection of a supplemental fuel (natural gas, oil, or coal) into the main furnace to produce locally reducing stoichiometric conditions which convert the NO x produced therein to molecular nitrogen, thereby reducing overall NO x emissions. There are currently no commercially-demonstrated combustion modification techniques for cyclone boilers which reduce NO x emissions. The emerging reburning technology offers cyclone boiler operators a promising alternative to expensive flue gas cleanup techniques for NO x emission reduction. This paper reviews baseline testing results at the Nelson Dewey Station and pilot-scale results simulating Nelson Dewey operation using pulverized coal (PC) as the reburning fuel. Outcomes of the model studies as well as the full-scale demonstration preliminary design are discussed

  16. Environmental control during steam boiler washing

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Marcio A.B.; Abreu Pereira, Vera L. de [Companhia Petroquimica do Nordeste (COPENE), Camacari, BA (Brazil). Div. de Engenharia Ambiental; Ringler, Ulrich E.S. [PROMON Engenharia Ltda., Salvador, BA (Brazil)

    1994-12-31

    The washing and chemical cleaning of boilers, activities of a high polluting potential, are responsible for the generation of wastewater of high contents of heavy metals, suspended solids and chemical oxygen demand (COD). This paper describes the actions carried out by COPENE - Petroquimica do Nordeste S/A - in order to reduce this problem. (author). 10 refs., 3 figs., 2 tabs.

  17. 22 de marzo: Día Internacional del Agua

    OpenAIRE

    Facultad de Ciencias Agrarias y Forestales

    2013-01-01

    Con la excusa del día internacional del agua, nos parece importante compartir con ustedes algunos conceptos importantes. ¿A qué se denomina agua potable? Agua potable es aquella que, bien en su estado natural o después de un tratamiento adecuado, es apta para el consumo humano y no produce ningún efecto perjudicial para la salud. Es limpia, transparente, sin olores o sabores desagradables y está libre de contaminantes.

  18. Los microbios en el agua de las unidades dentales

    Directory of Open Access Journals (Sweden)

    Chris H. Milleri

    1996-12-01

    Full Text Available Los microbios están presentes en el agua de las unidades dentales y existen en la biocapa que cubre las paredes de las tuberías de agua. El mejoramiento de la calidad microbiana del agua en las unidades dentales según estén disponibles los medios es una parte natural del mantenimiento de la calidad para la atención al paciente y al equipo de trabajo.

  19. Minería del agua

    OpenAIRE

    Reynolds Vargas, Jenny

    2016-01-01

    En Costa Rica el recurso hídrico se ve amenazado ante una explotación sin control en actividades que implican la extracción o minería del agua, es decir, la fuente es empleada hasta que se agota, cuando ya es inútil para consumo, irrigación o recreación. Se señala en este artículo el agravamiento del problema por la falta de mecanismos de protección que promuevan un uso sotenible del agua y se brindan algunas recomendaciones en pro de mejorar la calidad del recurso.

  20. Inventario nacional del uso actual del agua

    OpenAIRE

    Oficina Nacional de Evaluación de Recursos Naturales

    1984-01-01

    Establece como se emplea el agua en el Perú, teniendo en cuenta el tipo de uso, consuntivo y no consuntivo, discriminando según sea el destino: agrícola, pecuario, poblacional,industrial, minero, energético y pesquero, así como su localización geográfica; ello con la finalidad de que sirva de información básica para la planificación del desarrollo.

  1. Tratamiento del agua para consumo humano en el hogar

    OpenAIRE

    Instituto Nacional de Salud

    2008-01-01

    El agua es esencial para la vida y la accesibilidad del ser humano a ella le ha permitido asentarse, desarrollarse, recrearse y asegurar su supervivencia y salud. El uso cotidiano donde hombres, mujeres, niños y ancianos hacen uso de ésta, se relaciona con el acceso del agua para satisfacer necesidades básicas como el agua para bebida, higiene personal y alimentación. La privación del acceso del agua dulce ya sea en cantidades o calidades adecuadas pone en riesgo su salud y calidad de vida...

  2. On-line monitoring system for utility boiler diagnostics

    International Nuclear Information System (INIS)

    Radovanovic, P.M.; Afgan, N.H.; Caralho, M.G.

    1997-01-01

    The paper deals with the new developed modular type Monitoring System for Utility Boiler Diagnostics. Each module is intended to assess the specific process and can be used as a stand alone application. Four modules are developed, namely: LTC - module for the on-line monitoring of parameters related to the life-time consumption of selected boiler components; TRD - module for the tube rupture detection by the position and working fluid Ieakage quantity; FAM - module for the boiler surfaces fouling (slagging) assessment and FLAP - module for visualization of the boiler furnace flame position. All four modules are tested on respective pilot plants built oil the 200 and 300 MWe utility boilers. Monitoring System is commercially available and can be realized in any combination of its modules depending on demands induced by the operational problems of specific boiler. Further development of Monitoring System is performed in accordance with the respective EU project on development of Boiler Expert System. (Author)

  3. The behavior of ash species in suspension fired biomass boilers

    DEFF Research Database (Denmark)

    Jensen, Peter Arendt

    While fluid bed and grate fired boilers initially was the choice of boilers used for power production from both wood and herbaceous biomass, in recent years suspension fired boilers have been increasingly used for biomass based power production. In Denmark several large pulverized fuel boilers have...... been converted from coal to biomass combustion in the last 15 years. This have included co-firing of coal and straw, up to 100% firing of wood or straw andthe use of coal ash as an additive to remedy problems with wood firing. In parallel to the commercialization of the pulverized biomass firing...... technology a long range of research studies have been conducted, to improve our understanding of the influence and behavior of biomass ash species in suspension fired boilers. The fuel ash plays a key role with respect tooptimal boiler operation and influences phenomena’s as boiler chamber deposit formation...

  4. Estudio sanitario de los recursos hídricos: aguas residuales y aguas de consumo de la zona de Linares

    OpenAIRE

    Román Martínez, Isidoro

    2011-01-01

    Se ha realizado durante el periodo marzo-1987 a abril-1988 un estudio desde el punto de vista sanitario de 45 puntos de muestreo correspondientes a los municipios de Linares (20), Vilches (16), Jabalquinto (6), la Carolina (1), Santa Elena (1) y bailen (1). Las aguas fueron agrupadas por naturalezas. Resultando la distribuci??n siguiente: residuales (12), fluviales (16), aguas tratadas (10) y aguas profundas (7). De estas, se utilizaban para el consumo las correspondientes a 16 puntos. entre ...

  5. Oxy-Combustion Boiler Material Development

    Energy Technology Data Exchange (ETDEWEB)

    Gagliano, Michael; Seltzer, Andrew; Agarwal, Hans; Robertson, Archie; Wang, Lun

    2012-01-31

    Under U.S. Department of Energy Cooperative Agreement No. DE-NT0005262 Foster Wheeler North America Corp conducted a laboratory test program to determine the effect of oxy-combustion on boiler tube corrosion. In this program, CFD modeling was used to predict the gas compositions that will exist throughout and along the walls of air-fired and oxy-fired boilers operating with low to high sulfur coals. Test coupons of boiler tube materials were coated with deposits representative of those coals and exposed to the CFD predicted flue gases for up to 1000 hours. The tests were conducted in electric tube furnaces using oxy-combustion and air-fired flue gases synthesized from pressurized cylinders. Following exposure, the test coupons were evaluated to determine the total metal wastage experienced under air and oxy-combustions conditions and materials recommendations were made. Similar to air-fired operation, oxy-combustion corrosion rates were found to vary with the boiler material, test temperature, deposit composition, and gas composition. Despite this, comparison of air-fired and oxy-fired corrosion rates showed that oxy-firing rates were, for the most part, similar to, if not lower than those of air-firing; this finding applied to the seven furnace waterwall materials (wrought and weld overlay) and the ten superheater/reheater materials (wrought and weld overlay) that were tested. The results of the laboratory oxy-combustion tests, which are based on a maximum bulk flue gas SO2 level of 3200 ppmv (wet) / 4050 ppmv (dry), suggest that, from a corrosion standpoint, the materials used in conventional subcritical and supercritical, air-fired boilers should also be suitable for oxy-combustion retrofits. Although the laboratory test results are encouraging, they are only the first step of a material evaluation process and it is recommended that follow-on corrosion tests be conducted in coal-fired boilers operating under oxy-combustion to provide longer term (one to two year

  6. Oxy-Combustion Boiler Material Development

    Energy Technology Data Exchange (ETDEWEB)

    Michael Gagliano; Andrew Seltzer; Hans Agarwal; Archie Robertson; Lun Wang

    2012-01-31

    Under U.S. Department of Energy Cooperative Agreement No. DE-NT0005262 Foster Wheeler North America Corp conducted a laboratory test program to determine the effect of oxy-combustion on boiler tube corrosion. In this program, CFD modeling was used to predict the gas compositions that will exist throughout and along the walls of air-fired and oxy-fired boilers operating with low to high sulfur coals. Test coupons of boiler tube materials were coated with deposits representative of those coals and exposed to the CFD predicted flue gases for up to 1000 hours. The tests were conducted in electric tube furnaces using oxy-combustion and air-fired flue gases synthesized from pressurized cylinders. Following exposure, the test coupons were evaluated to determine the total metal wastage experienced under air and oxy-combustions conditions and materials recommendations were made. Similar to air-fired operation, oxy-combustion corrosion rates were found to vary with the boiler material, test temperature, deposit composition, and gas composition. Despite this, comparison of air-fired and oxy-fired corrosion rates showed that oxy-firing rates were, for the most part, similar to, if not lower than those of air-firing; this finding applied to the seven furnace waterwall materials (wrought and weld overlay) and the ten superheater/reheater materials (wrought and weld overlay) that were tested. The results of the laboratory oxy-combustion tests, which are based on a maximum bulk flue gas SO{sub 2} level of 3200 ppmv (wet) / 4050 ppmv (dry), suggest that, from a corrosion standpoint, the materials used in conventional subcritical and supercritical, air-fired boilers should also be suitable for oxy-combustion retrofits. Although the laboratory test results are encouraging, they are only the first step of a material evaluation process and it is recommended that follow-on corrosion tests be conducted in coal-fired boilers operating under oxy-combustion to provide longer term (one to

  7. Advisory expert system for energy analysis in industrial boilers; Sistema experto asesor en el analisis energetico de calderas industriales

    Energy Technology Data Exchange (ETDEWEB)

    Kemper Valverde, Nicolas; Lara Rosano, Felipe; Vazquez Nava, Rodolfo [Laboratorio de Inteligencia Artificial, Instituto de Ingenieria UNAM, Mexico, D. F. (Mexico)

    1994-12-31

    This paper presents an expert system for the operational analysis of industrial boilers, estimating the potential of heat recovery, in the small and medium size industry. The package is friendly, practical, flexible easy to maintain and expandable to take into consideration the user`s specific requirements and allows the analysis of the energy losses in the combustion, feed water, drains, and insulation, identifying the enhancements and estimating the saving potential, in energy as well as economical. [Espanol] En este trabajo se presenta un sistema experto para analizar la operacion de calderas industriales estimando el potencial de recuperacion de calor, en la pequena y mediana industria. El paquete es amigable, practico, flexible, facil en su mantenimiento y expandible para tomar en consideracion los requerimientos especificos de los usuarios y permite el analisis de las perdidas de energia en la combustion, agua de alimentacion, purgas y aislamientos, identificando las mejoras y estimando ahorros potenciales, tanto energeticos como economicos.

  8. Sistema de agua entubada de Cambugán

    OpenAIRE

    Mayorga, O.H.

    2004-01-01

    Los usos principales del agua de Cambugán son lavar ropa y actividades domésticas. Quienes acceden a otro sistema de mejor calidad usan el agua para beber. Hay problemas de sedimentos, mal sabor y olor. Da recomendaciones para educación y otros estudios específicos.

  9. Maximising safety in the boiler house.

    Science.gov (United States)

    Derry, Carr

    2013-03-01

    Last month's HEJ featured an article, the second in our new series of guidance pieces aimed principally at Technician-level engineers, highlighting some of the key steps that boiler operators can take to maximise system performance and efficiency, and thus reduce running both costs and carbon footprint. In the third such article, Derry Carr, C.Env, I.Eng, BSc (Hons), M.I.Plant.E., M.S.O.E., technical manager & group gas manager at Dalkia, who is vice-chairman of the Combustion Engineering Association, examines the key regulatory and safety obligations for hospital energy managers and boiler technicians, a number of which have seen changes in recent years with revision to guidance and other documentation.

  10. Control Properties of Bottom Fired Marine Boilers

    DEFF Research Database (Denmark)

    Solberg, Brian; Andersen, Palle; Karstensen, Claus M. S.

    2005-01-01

    This paper focuses on model analysis of a dynamic model of a bottom fired one-pass smoke tube boiler. Linearised versions of the model are analysed to determine how gain, time constants and right half plane zeros (caused by the shrink-and-swell phenomenon) depend on the steam flow load. Furthermore...... the interactions in the system are inspected to analyse potential benefit from using a multivariable control strategy in favour of the current strategy based on single loop theory. An analysis of the nonlinear model is carried out to further determine the nonlinear characteristics of the boiler system...... and to verify whether nonlinear control is needed. Finally a controller based on single loop theory is used to analyse if input constraints become active when rejecting transient behaviour from the disturbance steam flow. The model analysis shows large variations in system gains at steady state as function...

  11. Recovery boiler model; Soodakattilan kehitystyoe III

    Energy Technology Data Exchange (ETDEWEB)

    Janka, K.; Ylitalo, M.; Sundstroem, K.; Helke, R.; Heinola, M. [Kvaerner Pulping Oy, Tampere (Finland)

    1997-10-01

    The recovery boiler model was further tested and developed. At this moment the model includes submodels for: droplet drying, pyrolysis, char burning, gas burning and for droplet trajectory. During 1996 the formation of CH{sub 4} during pyrolysis and release of sulfur was included to the model. Further the formation of NO from fuel nitrogen and formation of thermal- NO were included to the model using Arrhenius type reaction rate equations. The calculated results are realistic and the model is used as a tool to find out methods to increase the efficiency and availability and decrease the emissions. Analysing the results of the earlier field study of 8 boilers showed that the furnace heat load, fuming rate, find the black liquor composition have influence on the enrichment of the potassium to the fly ash. (orig.)

  12. Biomass Cofiring in Coal-Fired Boilers

    Energy Technology Data Exchange (ETDEWEB)

    2004-06-01

    Cofiring biomass-for example, forestry residues such as wood chips-with coal in existing boilers is one of the easiest biomass technologies to implement in a federal facility. The current practice is to substitute biomass for up to 20% of the coal in the boiler. Cofiring has many benefits: it helps to reduce fuel costs as well as the use of landfills, and it curbs emissions of sulfur oxide, nitrogen oxide, and the greenhouse gases associated with burning fossil fuels. This Federal Technology Alert was prepared by the Department of Energy's Federal Energy Management Program to give federal facility managers the information they need to decide whether they should pursue biomass cofiring at their facilities.

  13. Stationary Engineers Apprenticeship. Related Training Modules. 12.1-12.9. Boilers.

    Science.gov (United States)

    Lane Community Coll., Eugene, OR.

    This learning module, one in a series of 20 related training modules for apprentice stationary engineers, deals with boilers. Addressed in the individual instructional packages included in the module are the following topics: firetube and watertube boilers; boiler construction; procedures for operating and cleaning boilers; and boiler fittings,…

  14. 46 CFR 52.25-7 - Electric boilers (modifies PEB-1 through PEB-19).

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Electric boilers (modifies PEB-1 through PEB-19). 52.25... ENGINEERING POWER BOILERS Other Boiler Types § 52.25-7 Electric boilers (modifies PEB-1 through PEB-19). Electric boilers required to comply with this part must meet the applicable provisions in this part and the...

  15. Circulating fluidized bed boilers design and operations

    CERN Document Server

    Basu, Prabir

    1991-01-01

    This book provides practicing engineers and students with insight into the design and operation of circulating fluidized bed (CFB) boilers. Through a combination of theoretical concepts and practical experience, this book gives the reader a basic understanding of the many aspects of this subject.Important environmental considerations, including solid waste disposal and predicted emissions, are addressed individually in separate chapters. This book places an emphasis on combustion, hydrodynamics, heat transfer, and material issues, and illustrates these concepts with numerous examples of pres

  16. Chromate dermatitis from a boiler lining.

    Science.gov (United States)

    Rycroft, R J; Calnan, C D

    1977-08-01

    Chromate dermatitis is described in a mechanical fitter working inside boiler combustion chambers. A source of hexavalent chromate is traced to the action of the heat and alkaline fuel ash on trivalent chrome ore in parts of the refractory lining. Removal of the patient from this contact has resulted in almost complete clearing of his dermatitis, without any relapse, during a 9-month follow-up period.

  17. Husk energy for boilers and furnaces

    Energy Technology Data Exchange (ETDEWEB)

    Deven, M.

    1985-10-01

    In view of the technical feasibility and economic viability, industries located in rice, coconut, and cotton growing areas, can easily switch over from oil/coal fired furnace/boilers to husk fired ones and thereby effect fuel economy. The banks and financial institutions will readily agree to provide finance as per directions of the governments and in some cases they also offer subsidy for development and utilization of energy saving devices.

  18. Particulate emission abatement for Krakow boiler houses

    Energy Technology Data Exchange (ETDEWEB)

    Wysk, R.

    1995-12-31

    Among the many strategies for improving air quality in Krakow, one possible method is to adapt new and improved emission control technology. This project focuses on such a strategy. In order to reduce dust emissions from coal-fueled boilers, a new device called a Core Separator has been introduced in several boiler house applications. This advanced technology has been successfully demonstrated in Poland and several commercial units are now in operation. Particulate emissions from the Core Separator are typically 3 to 5 times lower than those from the best cyclone collectors. It can easily meet the new standard for dust emissions which will be in effect in Poland after 1997. The Core Separator is a completely inertial collector and is based on a unique recirculation method. It can effectively remove dust particles below 10 microns in diameter, the so-called PM-10 emissions. Its performance approaches that of fabric filters, but without the attendant cost and maintenance. It is well-suited to the industrial size boilers located in Krakow. Core Separators are now being marketed and sold by EcoInstal, one of the leading environmental firms in Poland, through a cooperative agreement with LSR Technologies.

  19. Boiler systems for nuclear powered reactors

    International Nuclear Information System (INIS)

    Cook, R.K.; George, B.V.

    1979-01-01

    A power generating plant which comprises a heat source, at least one main steam turbine and at least one main boiler heated by heat from the heat source and providing the steam to drive the turbine, comprises additionally at least one further steam turbine, smaller than the main turbine, and at least one further boiler, of lower capacity than the main boiler, and heated from the same heat source and providing steam for the further turbine. Particularly advantageous in nuclear power stations, where the heat source is a nuclear reactor, the invention enables peak loads, above the normal continuous rating of the main generators driven by the main turbines, to be met by the further turbine(s) and one or more further generators driven thereby. This enables the main turbines to be freed from the thermal stresses of rapid load changes, which stresses are more easily accommodated by the smaller and thus more tolerant further turbine(s). Thus auxiliary diesel-driven or other independent power plant may be made partly or wholly unnecessary. Further, low-load running which would be inefficient if achieved by means of the main turbine(s), can be more efficiently effected by shutting them down and using the smaller further turbine(s) instead. These latter may also be used to provide independent power for servicing the generating plant during normal operation or during emergency or other shutdown, and in this latter case may also serve as a heat sink for the shutdown reactor

  20. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; R.W. Swindeman; J. Sarver; J. Blough; W. Mohn; M. Borden; S. Goodstine; I. Perrin

    2003-10-20

    The principal objective of this project is to develop materials technology for use in ultrasupercritical (USC) plant boilers capable of operating with 760 C (1400 F), 35 MPa (5000 psi) steam. This project has established a government/industry consortium to undertake a five-year effort to evaluate and develop of advanced materials that allow the use of advanced steam cycles in coal-based power plants. These advanced cycles, with steam temperatures up to 760 C, will increase the efficiency of coal-fired boilers from an average of 35% efficiency (current domestic fleet) to 47% (HHV). This efficiency increase will enable coal-fired power plants to generate electricity at competitive rates (irrespective of fuel costs) while reducing CO{sub 2} and other fuel-related emissions by as much as 29%. Success in achieving these objectives will support a number of broader goals. First, from a national prospective, the program will identify advanced materials that will make it possible to maintain a cost-competitive, environmentally acceptable coal-based electric generation option. High sulfur coals will specifically benefit in this respect by having these advanced materials evaluated in high-sulfur coal firing conditions and from the significant reductions in waste generation inherent in the increased operational efficiency. Second, from a national prospective, the results of this program will enable domestic boiler manufacturers to successfully compete in world markets for building high-efficiency coal-fired power plants.

  1. Field Test of Boiler Primary Loop Temperature Controller

    Energy Technology Data Exchange (ETDEWEB)

    Glanville, P. [Partnership for Advanced Residential Retrofit, Des Plaines, IL (United States); Rowley, P. [Partnership for Advanced Residential Retrofit, Des Plaines, IL (United States); Schroeder, D. [Partnership for Advanced Residential Retrofit, Des Plaines, IL (United States); Brand, L. [Partnership for Advanced Residential Retrofit, Des Plaines, IL (United States)

    2014-09-01

    Beyond these initial system efficiency upgrades are an emerging class of Advanced Load Monitoring (ALM) aftermarket controllers that dynamically respond to the boiler load, with claims of 10% to 30% of fuel savings over a heating season. For hydronic boilers specifically, these devices perform load monitoring, with continuous measurement of supply and, in some cases, return water temperatures. Energy savings from these ALM controllers are derived from dynamic management of the boiler differential, where a microprocessor with memory of past boiler cycles prevents the boiler from firing for a period of time, to limit cycling losses and inefficient operation during perceived low load conditions. These differ from OTR controllers, which vary boiler setpoint temperatures with ambient conditions while maintaining a fixed differential.

  2. Modelling, simulating and optimizing boiler heating surfaces and evaporator circuits

    DEFF Research Database (Denmark)

    Sørensen, K.; Condra, T.; Houbak, Niels

    2003-01-01

    A model for optimizing the dynamic performance of boiler have been developed. Design variables related to the size of the boiler and its dynamic performance have been defined. The object function to be optimized takes the weight of the boiler and its dynamic capability into account. As constraints...... for the optimization a dynamic model for the boiler is applied. Furthermore a function for the value of the dynamic performance is included in the model. The dynamic models for simulating boiler performance consists of a model for the flue gas side, a model for the evaporator circuit and a model for the drum....... The dynamic model has been developed for the purpose of determining boiler material temperatures and heat transfer from the flue gas side to the water-/steam side in order to simulate the circulation in the evaporator circuit and hereby the water level fluctuations in the drum. The dynamic model has been...

  3. Life extension of boilers using weld overlay protection

    Energy Technology Data Exchange (ETDEWEB)

    Lai, G.; Hulsizer, P. [Welding Services Inc., Norcross, GA (United States); Brooks, R. [Welding Services Inc., Welding Services Europe, Spijkenisse (Netherlands)

    1998-12-31

    The presentation describes the status of modern weld overlay technology for refurbishment, upgrading and life extension of boilers. The approaches to life extension of boilers include field overlay application, shop-fabricated panels for replacement of the worn, corroded waterwall and shop-fabricated overlay tubing for replacement of individual tubes in superheaters, generating banks and other areas. The characteristics of weld overlay products are briefly described. Also discussed are successful applications of various corrosion-resistant overlays for life extension of boiler tubes in waste-to-energy boilers, coal-fired boilers and chemical recovery boilers. Types of corrosion and selection of weld overlay alloys in these systems are also discussed. (orig.) 14 refs.

  4. Life extension of boilers using weld overlay protection

    Energy Technology Data Exchange (ETDEWEB)

    Lai, G; Hulsizer, P [Welding Services Inc., Norcross, GA (United States); Brooks, R [Welding Services Inc., Welding Services Europe, Spijkenisse (Netherlands)

    1999-12-31

    The presentation describes the status of modern weld overlay technology for refurbishment, upgrading and life extension of boilers. The approaches to life extension of boilers include field overlay application, shop-fabricated panels for replacement of the worn, corroded waterwall and shop-fabricated overlay tubing for replacement of individual tubes in superheaters, generating banks and other areas. The characteristics of weld overlay products are briefly described. Also discussed are successful applications of various corrosion-resistant overlays for life extension of boiler tubes in waste-to-energy boilers, coal-fired boilers and chemical recovery boilers. Types of corrosion and selection of weld overlay alloys in these systems are also discussed. (orig.) 14 refs.

  5. Behavioral study solar boilers 1994. Summary. Part 2 (households)

    International Nuclear Information System (INIS)

    Visser, J.M.

    1995-04-01

    The aim of the Dutch national solar boiler campaign of NOVEM and Holland Solar is to realize the installation of 300,000 solar boilers in the Netherlands in the year 2010. In 1995 10,000 boilers were installed. More knowledge of the decision making process and the backgrounds and motives of (potential) buyers is required. From September 1994 to March 1995 a survey has been carried out of the decision making processes in households and housing corporations. The most important results, conclusions and recommendations of the survey are summarized in this report. The parameters that can influence the decision whether to purchase a solar boiler or not are knowledge about the solar boiler, the attitude towards the solar boiler and towards the use of energy and the environment, risk perception, social aspects, information retrieval behavior, constraints, and socio-economic aspects. 44 tabs

  6. NOx PREDICTION FOR FBC BOILERS USING EMPIRICAL MODELS

    Directory of Open Access Journals (Sweden)

    Jiří Štefanica

    2014-02-01

    Full Text Available Reliable prediction of NOx emissions can provide useful information for boiler design and fuel selection. Recently used kinetic prediction models for FBC boilers are overly complex and require large computing capacity. Even so, there are many uncertainties in the case of FBC boilers. An empirical modeling approach for NOx prediction has been used exclusively for PCC boilers. No reference is available for modifying this method for FBC conditions. This paper presents possible advantages of empirical modeling based prediction of NOx emissions for FBC boilers, together with a discussion of its limitations. Empirical models are reviewed, and are applied to operation data from FBC boilers used for combusting Czech lignite coal or coal-biomass mixtures. Modifications to the model are proposed in accordance with theoretical knowledge and prediction accuracy.

  7. Tratamiento de aguas contaminadas con cianuro

    OpenAIRE

    Aguilar Roca, Fernando; Aguilar Roca, Fernando; Aguilar Roca, Fernando

    2011-01-01

    El presente trabajo “Tratamiento de aguas contaminadas con cianuro" se divide en tres partes: química del contaminante, procesos de descontaminación estudiados y un procedimiento basado en una investigación reciente. Principales propiedades físico-químicas del ion cianuro y de sus principales compuestos, cianuros simples o complejos, en medio acuoso. Métodos y procesos que existen para la descontaminación de efluentes cianurados, tanto los que se dan de forma natural (degradación natu...

  8. Field Test of Boiler Primary Loop Temperature Controller

    Energy Technology Data Exchange (ETDEWEB)

    Glanville, P.; Rowley, P.; Schroeder, D.; Brand, L.

    2014-09-01

    Beyond these initial system efficiency upgrades are an emerging class of Advanced Load Monitoring (ALM) aftermarket controllers that dynamically respond to the boiler load, with claims of 10% to 30% of fuel savings over a heating season. For hydronic boilers specifically, these devices perform load monitoring, with continuous measurement of supply and in some cases return water temperatures. Energy savings from these ALM controllers are derived from dynamic management of the boiler differential, where a microprocessor with memory of past boiler cycles prevents the boiler from firing for a period of time, to limit cycling losses and inefficient operation during perceived low load conditions. These differ from OTR controllers, which vary boiler setpoint temperatures with ambient conditions while maintaining a fixed differential. PARR installed and monitored the performance of one type of ALM controller, the M2G from Greffen Systems, at multifamily sites in the city of Chicago and its suburb Cary, IL, both with existing OTR control. Results show that energy savings depend on the degree to which boilers are over-sized for their load, represented by cycling rates. Also savings vary over the heating season with cycling rates, with greater savings observed in shoulder months. Over the monitoring period, over-sized boilers at one site showed reductions in cycling and energy consumption in line with prior laboratory studies, while less over-sized boilers at another site showed muted savings.

  9. Between the boiler and buffer tank; Zwischen Kessel und Speicher

    Energy Technology Data Exchange (ETDEWEB)

    Ertmer, Katharina

    2013-08-06

    Some manufacturers offer new heating pump groups for return temperature raising for solid-fuel boilers. [German] Einige Hersteller bieten neue Heizungspumpengruppen zur Ruecklauftemperaturanhebung bei Festbrennstoffkesseln an.

  10. Simulation and testing of a new condensing boiler

    International Nuclear Information System (INIS)

    Rosa, L.; Tosato, R.

    1987-01-01

    The paper describes a new condensing boiler, characterized by the evacuation of flue-gases by natural draft. The best result is the consequent simplification of manufacturing, hook-up and operation of the boiler. Seasonal efficiency of the boiler, which operates with flue-gases conditioning to assure natural draft, rests about at same levels as for conventional condensing boilers. The authors emphasize the difficulty of simulate natural draft mechanism by mathematics because, in this case, flow of flue-gases and air at the draft diverter is strongly three-dimensional

  11. Reciclado de las aguas de decapado

    Directory of Open Access Journals (Sweden)

    López, F. A.

    1998-05-01

    Full Text Available Pickling liquors from steel industry, listed as hazardous wastes in most industrializated countries, have been treated by means of several procedures in order to recover the iron and other metals and to obtain an environmental friendly effluent. Depending on the treatment employed, different valuable ferrous products have been obtained. Ammoniojarosite and zinc ferrite were precipitated from the previously oxidised ferrous solutions.

    En la mayoría de los países industrializados, se incluyen las aguas de decapado, tanto las procedentes de los aceros al carbono como de aceros inoxidables, dentro de las listas de residuos tóxicos y peligrosos. Se presentan en este trabajo los resultados obtenidos en las investigaciones realizadas en los últimos años en los que se ha estudiado el tratamiento y recuperación de aguas de decapado de aceros comunes e inoxidables. Su tratamiento se ha enfocado hacia la consecución de dos objetivos: la recuperación del contenido total de metales y la obtención de un efluente de menor impacto ambiental. Se presentan los procedimientos estudiados para la obtención de compuestos de hierro, amoniojarosita y ferritas de zinc, con cierto valor añadido.

  12. The Agua Salud Project, Central Panama

    Science.gov (United States)

    Stallard, R. F.; Elsenbeer, H.; Ogden, F. L.; Hall, J. S.

    2007-12-01

    The Agua Salud Project utilizes the Panama Canal's central role in world commerce to focus global attention on the ecosystem services provided by tropical forests. It will be the largest field experiment of its kind in the tropics aimed at quantifying the environmental services (water, carbon, and biodiversity) provided by tropical forests. The Agua Salud Watershed is our principal field site. This watershed and the headwaters of several adjacent rivers include both protected mature forests and a wide variety of land uses that are typical of rural Panama. Experiments at the scale of entire catchments will permit complete water and carbon inventories and exchanges for different landscape uses. The following questions will be addressed: (1) How do landscape treatments and management approaches affect ecosystem services such as carbon storage, water quality and quantity, dry- season water supply, and biodiversity? (2) Can management techniques be designed to optimize forest production along with ecosystem services during reforestation? (3) Do different tree planting treatments and landscape management approaches influence groundwater storage, which is thought to be critical to maintaining dry-season flow, thus insuring the full operation of the Canal during periods of reduced rainfall and severe climatic events such as El Niño. In addition we anticipate expanding this project to address biodiversity, social, and economic values of these forests.

  13. Increase of energy efficiency in proportional adjusting of flow rate in the boiler circuit

    OpenAIRE

    Artamonov Pavel A.; Kurilenko Nikolai I.; Mamontov Gennady Ya.

    2017-01-01

    The article presents the results of theoretical studies in the field of the boiler circuit operating modes for the boiler rooms operating by the independent heat supply scheme. The 3D model of a boiler circuit for a boiler room with 3 MW rated output was developed, based on which there was made an estimation of the boiler pump performance indicators. There is proposed a method for reducing energy costs for the operation of the pumping equipment of the boiler circuit.

  14. Precio y manejo del agua urbana en México

    Directory of Open Access Journals (Sweden)

    Gregorio Castro Rosales

    2015-01-01

    Full Text Available Este trabajo propone evaluar el potencial del precio que pagan los usuarios como ins - trumento para el manejo de la demanda urbana de agua en México. Nuestros resulta - dos basados en un análisis de datos provenientes de cientos de organismos operadores de agua potable del país, revelan que la demanda de agua sí es sensible al precio, tal y como se ha señalado en otros estudios. No obstante, encontramos también que la demanda es aún mucho más sensible al efecto del crecimiento poblacional y económi - co. Por lo tanto, considerando la dinámica demográfica, urbana y económica del país, un aumento en el precio del agua en sí no podría contribuir significativamente a la estabilización de los requerimientos nacionales de extracción de agua para uso urbano. Además, nuestro análisis de los determinantes del precio del agua urbana revela que los organismos operadores pasan sistemáticamente el costo de sus ineficiencias técnicas y financieras a los usuarios, por lo que un aumento en el precio del agua tampoco podría contribuir al saneamiento de sus finanzas. Concluimos que para un manejo efectivo, eficiente y sustentable del uso urbano de agua, resulta imprescindible un cambio de fondo en la manera en que operan los sistemas urbanos de agua.

  15. Application of 1-hydroxyethylidene-1, 1-diphosphonic acid in boiler water for industrial boilers.

    Science.gov (United States)

    Zeng, Bin; Li, Mao-Dong; Zhu, Zhi-Ping; Zhao, Jun-Ming; Zhang, Hui

    2013-01-01

    The primary method used for boiler water treatment is the addition of chemicals to industrial boilers to prevent corrosion and scaling. The static scale inhibition method was used to evaluate the scale inhibition performance of 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP). Autoclave static experiments were used to study the corrosion inhibition properties of the main material for industrial boilers (20# carbon steel) with an HEDP additive in the industrial boiler water medium. The electrochemical behavior of HEDP on carbon steel corrosion control was investigated using electrochemical impedance spectroscopy and Tafel polarization techniques. Experimental results indicate that HEDP can have a good scale inhibition effect when added at a quantity of 5 to 7 mg/L at a test temperature of not more than 100 °C. To achieve a high scale inhibition rate, the HEDP dosage must be increased when the test temperature exceeds 100 °C. Electrochemical and autoclave static experimental results suggest that HEDP has a good corrosion inhibition effect on 20# carbon steel at a concentration of 25 mg/L. HEDP is an excellent water treatment agent.

  16. Deposit Probe Measurements in Large Biomass-Fired Grate Boilers and Pulverized-Fuel Boilers

    DEFF Research Database (Denmark)

    Hansen, Stine Broholm; Jensen, Peter Arendt; Jappe Frandsen, Flemming

    2014-01-01

    A number of full-scale deposit probe measuring campaigns conducted in grate-fired and suspension-fired boilers, fired with biomass, have been reviewed and compared. The influence of operational parameters on the chemistry of ash and deposits, on deposit build-up rates, and on shedding behavior has...... of the deposits formed is determined by the fly ash composition and the flue gas temperature; increases in the local flue gas temperature lead to higher contents of Si and Ca and lower contents of Cl in the deposits. The net deposit build-up rates in grate-fired and suspension-fired boilers are at similar levels....../wood-firing in suspension-fired boilers, shedding occurred by debonding with incomplete removal at flue gas temperatures of 600–1000 °C and by debonding with complete removal during wood-firing in suspension-fired boilers at high flue gas temperatures (1300 °C). Shedding events were not observed during wood suspension...

  17. 22 de marzo: Día Internacional del Agua

    OpenAIRE

    Facultad de Ciencias Agrarias y Forestales

    2013-01-01

    Con la excusa del día internacional del agua, nos parece importante compartir con ustedes algunos conceptos importantes. ¿A qué se denomina agua potable? Agua potable es aquella que, bien en su estado natural o después de un tratamiento adecuado, es apta para el consumo humano y no produce ningún efecto perjudicial para la salud. Es limpia, transparente, sin olores o sabores desagradables y está libre de contaminantes. Facultad de Ciencias Agrarias y Forestales

  18. TRATAMIENTO DE AGUAS RESIDUALES MEDIANTE IRRADIACIÓN GAMMA

    OpenAIRE

    Eduardo Campos Medina

    2009-01-01

    Esta investigación tiene por objetivo principal mostrar el efecto que tiene la aplicación de radiación gamma sobre los contaminantes orgánicos disueltos en aguas residuales industriales. En el proceso de investigación se emplearon porciones de agua residual de la empresa tratadora Reciclagua, estas muestras de agua mostraron elevados valores en cuanto a la Demanda Química de Oxígeno (DQO), posteriormente se aplicaron diferentes dosis de radiación gamma, buscando con ello la fragmentación de l...

  19. Materials and boiler rig testing to support chemical cleaning of once-through AGR boilers

    International Nuclear Information System (INIS)

    Tice, D.R.; Platts, N.; Raffel, A.S.; Rudge, A.

    2002-01-01

    An extensive programme of work has been carried out to evaluate two candidate inhibited cleaning solutions for possible implementation on plant, which would be the first chemical clean of an AGR boiler. The two candidate cleaning solutions considered were a Stannine-inhibited citric acid/formic acid mixture (GOM106) and inhibited hydrofluoric acid. Citric acid-based cleaning processes are widely used within the UK Power Industry. The GOM106 solution, comprising a mixture of 3% citric acid, 0.5% formic acid and 0.05% Stannine LTP inhibitor, buffered with ammonia to pH 3.5, was developed specifically for the AGR boilers during the 1970's. Although a considerable amount of materials testing work was carried out by British Energy's predecessor companies to produce a recommended cleaning procedure there were some remaining concerns with the use of GOM106, from these earlier studies, for example, an increased risk of pitting attack associated with the removal of thick 9Cr oxide deposits and a risk of unacceptable damage in critical locations such as the upper transition joints and other weld locations. Hence, additional testing was still required to validate the solution for use on plant. Inhibited hydrofluoric acid (HFA) was also evaluated as an alternative reagent to GOM106. HFA has been used extensively for cleaning mild and low'alloy steel boiler tubes in fossil-fired plant in the UK and elsewhere in Europe and is known to remove oxide quickly. Waste treatment is also easier than for the GOM106 process and some protection against damage to the boiler tube materials is provided by complexing of fluoride with ferric ion. Validation of the potential reagents and inhibitors was achieved by assessing the rate and effectiveness of oxide removal from specimens of helical boiler tubing and welds, together with establishing the extent of any metal loss or localised damage. The initial materials testing resulted in the inhibited ammoniated citric / formic acid reagent being

  20. CFD modeling of a boiler's tubes rupture

    International Nuclear Information System (INIS)

    Rahimi, Masoud; Khoshhal, Abbas; Shariati, Seyed Mehdi

    2006-01-01

    This paper reports the results of a study on the reason for tubes damage in the superheater Platen section of the 320 MW Bisotoun power plant, Iran. The boiler has three types of superheater tubes and the damage occurs in a series of elbows belongs to the long tubes. A three-dimensional modeling was performed using an in-house computational fluid dynamics (CFD) code in order to explore the reason. The code has ability of simultaneous solving of the continuity, the Reynolds-Averaged Navier-Stokes (RANS) equations and employing the turbulence, combustion and radiation models. The whole boiler including; walls, burners, air channels, three types of tubes, etc., was modeled in the real scale. The boiler was meshed into almost 2,000,000 tetrahedral control volumes and the standard k-ε turbulence model and the Rosseland radiation model were used in the model. The theoretical results showed that the inlet 18.9 MPa saturated steam becomes superheated inside the tubes and exit at a pressure of 17.8 MPa. The predicted results showed that the temperature of the steam and tube's wall in the long tubes is higher than the short and medium size tubes. In addition, the predicted steam mass flow rate in the long tube was lower than other ones. Therefore, it was concluded that the main reason for the rupture in the long tubes elbow is changing of the tube's metal microstructure due to working in a temperature higher than the design temperature. In addition, the structural fatigue tension makes the last elbow of the long tube more ready for rupture in comparison with the other places. The concluded result was validated by observations from the photomicrograph of the tube's metal samples taken from the damaged and undamaged sections

  1. Aguas diversas. Derechos de agua y pluralidad legal en las comunidades andinas

    Directory of Open Access Journals (Sweden)

    Boelens, Rutgerd

    2009-12-01

    Full Text Available Water rights and property relations have become pivotal issues in water debates, reforms and intervention programs. Governments, development agencies and expert centers tend to consider ‘water rights’ as merely standard black boxes that juxtapose the frameworks of positivist technical and economist water science. But far beyond universal manuals and irrigation regulations, there is another water world, entrenched in the everyday lives of real people, male and female water users. The paper makes clear how Andean user collectives practice an enormous variety of water rights and management forms, as localnational- international hybrids that are created and affirmed in local water territories, embedded in historical and cultural-political contexts.

    Por el aumento generalizado de los conflictos por el agua, los derechos a este recurso se han vuelto ejes en los debates, reformas y programas de intervención hídrica. Los gobiernos, las agencias de desarrollo y los centros expertos tienden a considerar los ‘derechos de agua’ como meras cajas negras estándar que se yuxtaponen a los marcos de las ciencias técnicas y económicas positivistas. Pero mucho más allá de los manuales y las regulaciones de riego, hay otro mundo del agua íntimamente ligado a la vida diaria de gente real, hombres y mujeres que usan ese agua. Este artículo estudia cómo los colectivos de usuarios en la región andina practican una enorme variedad de derechos de agua y formas de gestión, como híbridos locales-nacionales-internacionales que se crean y afirman en los territorios hídricos locales, embebidos en contextos históricos y cultural-políticos.

  2. Boiler inspection manipulator for Torness Power Station

    International Nuclear Information System (INIS)

    Carrey, R.T.A.; Playle, M.J.

    1996-01-01

    In-service inspection at Torness Advanced Gas-cooled Reactor is achieved, via penetrations above and below the core area and boilers and through eight circulator penetrations for inspection of the sub-diagrid area. A manipulator is described which can access the area above the reactor core via any of these eight peripheral penetrations. The design and fabrication of the manipulator has led to innovation with a number of possible solutions being tendered. In reactor deployment of the successful design is expected in early 1997. (UK)

  3. Multiloop control of a drum boiler

    Directory of Open Access Journals (Sweden)

    Alena Kozáková

    2014-05-01

    Full Text Available The Equivalent Subsystems Method (ESM (Kozáková et al., 2011 is methodology of decentralized controller design in the frequency domain which allows designing local controllers using any SISO frequency domain method. The paper deals with the digital ESM version where digital local PID controllers guaranteeing required performance for the full system are designed for individual equivalent subsystems using the practice-oriented Sine-wave method (Bucz et al., 2012. The proposed decentralized controller design procedure was verified on the nonlinear benchmark drum boiler simulation model (Morilla, 2012.

  4. Nuclear reactors with auxiliary boiler circuit

    International Nuclear Information System (INIS)

    George, B.V.; Cook, R.K.

    1976-01-01

    A gas-cooled nuclear reactor has a main circulatory system for the gaseous coolant incorporating one or more main energy converting units, such as gas turbines, and an auxiliary circulatory system for the gaseous coolant incorporating at least one steam generating boiler arranged to be heated by the coolant after its passage through the reactor core to provide steam for driving an auxiliary steam turbine, such an arrangement providing a simplified start-up procedure also providing emergency duties associated with long term heat removal on reactor shut down

  5. Test of a small domestic boiler using different pellets

    International Nuclear Information System (INIS)

    Dias, J.; Costa, M.; Azevedo, J.L.T.

    2004-01-01

    This paper presents results from an experimental study performed on a 13 kW th commercial domestic boiler using pellets as fuel. Four different types of pellets were used and, for each one, the boiler was tested as a function of its capacity and the fan regulation affecting excess air. Measurements were performed for boiler heat load, pellet consumption rate, flue-gas temperature and composition. Mass balances allowed the calculation of the flue-gas flow rate and associated heat losses. Losses from incomplete combustion have also been quantified. Under boiler steady-state conditions the flue-gas O 2 concentration changes with boiler load and ventilation due to the regulation scheme of the boiler. Flue-gas CO shows a minimum for values of O 2 in the flue-gases of about 13%. NO x emissions are independent of excess air for low values of nitrogen in the fuel whereas, for larger values, NO x emissions increase with the O 2 present in the combustion products. The fractional conversion of the pellet nitrogen into NO x is in line with literature data. The boiler start-up was characterised by the temperature evolution inside and above the bed showing the propagation of combustion in the bed during about 10 min. During boiler start-up, a maximum in CO emissions was observed which is associated with the maximum combustion intensity, as typified by the flue-gas O 2 concentration and temperature, regardless the pellet type. (Author)

  6. A rule-based industrial boiler selection system

    NARCIS (Netherlands)

    Tan, C.F.; Khalil, S.N.; Karjanto, J.; Tee, B.T.; Wahidin, L.S.; Chen, W.; Rauterberg, G.W.M.; Sivarao, S.; Lim, T.L.

    2015-01-01

    Boiler is a device used for generating the steam for power generation, process use or heating, and hot water for heating purposes. Steam boiler consists of the containing vessel and convection heating surfaces only, whereas a steam generator covers the whole unit, encompassing water wall tubes,

  7. CFD investigation of flow through internally riffled boiler tubes

    DEFF Research Database (Denmark)

    Rasmussen, Christian; Houbak, Niels; Sørensen, Jens Nørkær

    1997-01-01

    In this paper we show how to model the swirling flow in an internally riffled boiler tube. The flow field is visualized and the results are compared with measurements.......In this paper we show how to model the swirling flow in an internally riffled boiler tube. The flow field is visualized and the results are compared with measurements....

  8. 30 CFR 77.411 - Compressed air and boilers; general.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Compressed air and boilers; general. 77.411 Section 77.411 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE... COAL MINES Safeguards for Mechanical Equipment § 77.411 Compressed air and boilers; general. All...

  9. Exergetic Modelling of Oil-Fired Steam Boilers | Ohijeagbon ...

    African Journals Online (AJOL)

    The performance variables and potential for energy savings in oil-fired industrial steam boilers were studied. Operational parameters of steam boilers using low pour fuel oil (LPFO) and diesel were used to determine thermodynamic properties of material streams and exergetic parameters. Analysis of thermodynamic ...

  10. Assessment of Some Performance Characteristics of Refuse Boiler ...

    African Journals Online (AJOL)

    A pioneer palm oil boiler unit, in an immense power self-contained oil mill, impaired by many years of accumulated depreciation, was rebuilt in the pattern of a design-out scheme aimed primarily at rehabilitating the entire boiler system to a state of functionality. The research work studied the pre-maintenance and post ...

  11. DESIGN REPORT: LOW-NOX BURNERS FOR PACKAGE BOILERS

    Science.gov (United States)

    The report describes a low-NOx burner design, presented for residual-oil-fired industrial boilers and boilers cofiring conventional fuels and nitrated hazardous wastes. The burner offers lower NOx emission levels for these applications than conventional commercial burners. The bu...

  12. Solved and unsolved problems in boiler systems. Learning from accidents

    International Nuclear Information System (INIS)

    Ozawa, Mamoru

    2000-01-01

    This paper begins with a brief review on the similarity law of conventional fossil-fuel-fired boilers. The concept is based on the fact that the heat release due to combustion in the furnace is restricted by the furnace volume but the heat absorption is restricted by the heat transfer surface area. This means that a small-capacity boiler has relatively high specific furnace heat release rate, about 10 MW/m 3 , and on the contrary a large-capacity boiler has lower value. The surface-heat-flux limit is mainly dominated by the CHF inside the water-wall tubes of the boiler furnace, about 350 kW/m 2 . This heat-flux limit is almost the same order independently on the capacity of boilers. For the safety of water-walls, it is essential to retain suitable water circulation, i.e. circulation ratio and velocity of water. This principle is a common knowledge of boiler designer, but actual situation is not the case. Newly designed boilers often suffer from similar accidents, especially burnout due to circulation problems. This paper demonstrates recent accidents encountered in practical boilers, and raises problems of rather classical but important two-phase flow and heat transfer. (author)

  13. Thermomechanical finite element analysis of hot water boiler structure

    Directory of Open Access Journals (Sweden)

    Živković Dragoljub S.

    2012-01-01

    Full Text Available The paper presents an application of the Finite Elements Method for stress and strain analysis of the hot water boiler structure. The aim of the research was to investigate the influence of the boiler scale on the thermal stresses and strains of the structure of hot water boilers. Results show that maximum thermal stresses appear in the zone of the pipe carrying wall of the first reversing chamber. This indicates that the most critical part of the boiler are weld spots of the smoke pipes and pipe carrying plate, which in the case of significant scale deposits can lead to cracks in the welds and water leakage from the boiler. The nonlinear effects were taken into account by defining the bilinear isotropic hardening model for all boiler elements. Temperature dependency was defined for all relevant material properties, i. e. isotropic coefficient of thermal expansion, Young’s modulus, and isotropic thermal conductivity. The verification of the FEA model was performed by comparing the measured deformations of the hot water boiler with the simulation results. As a reference object, a Viessmann - Vitomax 200 HW boiler was used, with the installed power of 18.2 MW. CAD modeling was done within the Autodesk Inventor, and stress and strain analysis was performed in the ANSYS Software.

  14. Water Boiler Change-Over in Mini-TPP Mode

    Directory of Open Access Journals (Sweden)

    B. A. Bayrashevsky

    2011-01-01

    Full Text Available The paper considers water boiler modernization by its change-over in mini-TPP mode with an expansion tank and a heating turbine of small capacity.  A software complex permitting to evaluate competitive ability of such water boiler modernization in comparison with a cogeneration plant.

  15. Hybrid system for fouling control in biomass boilers

    Energy Technology Data Exchange (ETDEWEB)

    Romeo, Luis M.; Gareta, Raquel [Centro de Investigacin de Recursos y Consumos Energeticos (CIRCE), Universidad de Zaragoza, Centro Politecnico Superior, Mareda de Luna, 3, Zaragoza 50018, (Spain)

    2006-12-15

    Renewable energy sources are essential paths towards sustainable development and CO{sub 2} emission reduction. For example, the European Union has set the target of achieving 22% of electricity generation from renewable sources by 2010. However, the extensive use of this energy source is being avoided by some technical problems as fouling and slagging in the surfaces of boiler heat exchangers. Although these phenomena were extensively studied in the last decades in order to optimize the behaviour of large coal power boilers, a simple, general and effective method for fouling control has not been developed. For biomass boilers, the feedstock variability and the presence of new components in ash chemistry increase the fouling influence in boiler performance. In particular, heat transfer is widely affected and the boiler capacity becomes dramatically reduced. Unfortunately, the classical approach of regular sootblowing cycles becomes clearly insufficient for them. Artificial Intelligence (AI) provides new means to undertake this problem. This paper illustrates a methodology based on Neural Networks (NNs) and Fuzzy-Logic Expert Systems to select the moment for activating sootblowing in an industrial biomass boiler. The main aim is to minimize the boiler energy and efficiency losses with a proper sootblowing activation. Although the NN type used in this work is well-known and the Hybrid Systems had been extensively used in the last decade, the excellent results obtained in the use of AI in industrial biomass boilers control with regard to previous approaches makes this work a novelty. (Author)

  16. Optimization of feed water control for auxiliary boiler

    International Nuclear Information System (INIS)

    Li Lingmao

    2004-01-01

    This paper described the feed water control system of the auxiliary boiler steam drum in Qinshan Phase III Nuclear Power Plant, analyzed the deficiency of the original configuration, and proposed the optimized configuration. The optimized feed water control system can ensure the stable and safe operation of the auxiliary boiler, and the normal operation of the users. (author)

  17. Assessment of the candidate markets for liquid boiler fuels

    Energy Technology Data Exchange (ETDEWEB)

    None

    1979-12-01

    Liquid fuels can be produced from coal in a number of indirect and direct liquefaction processes. While indirect coal liquefaction has been proved commercially outside the United States, most attention in this country has focused on the direct liquefaction processes, which include the processes under examination in this report; namely, the Exxon Donor Solvent (EDS), the H-Coal, and the Solvent Refined Coal (SRC) II processes. The objectives of the study were to: compare the boiler fuels of direct coal liquefaction with residual fuel oil (No. 6 fuel oil) including physical characteristics and environmental hazards, such as carcinogenic characteristics and toxic hazard characteristics; determine whether a boiler fuel market would exist for the coal liquefaction products given their physical characteristics and potential environmental hazards; determine the advantages of utilizing methanol as a boiler fuel on a continuous basis in commercial boilers utilizing existing technology; identify the potential regional candidate markets for direct coal liquefaction products as liquid boiler fuels; determine the distributing and handling costs associated with marketing coal liquefaction products as liquid boiler fuels; determine the current regulatory issues associated with the marketing of coal liquefaction products as boiler fuels; and determine and evaluate other institutional issues associated with the marketing of direct coal liquefaction products as boiler fuels.

  18. A theoretical approach for energy saving in industrial steam boilers

    International Nuclear Information System (INIS)

    Sabry, T.I.; Mohamed, N.H.; Elghonimy, A.M.

    1993-01-01

    Optimization of the performance characteristics of such a steam boiler has been analyzed theoretically. Suitable thermodynamic relations have been utilized here to construct a computer model that would carry out the boiler performance characteristics at different operating parameters (e.g.; amount of excess air, fuel type, rate of blowdown preheating of combustion air and flow gases temperature). The results demonstrate that this computer model is to be used successfully in selecting the different operating parameters of the steam boiler at variant loads considering the best economical operation. Besides, this model can be used to investigate the sensitivity of the performance characteristics to the deviation of the boiler operating parameters from their optimum values. It was found also that changing the operating parameters beside the type of fuel in a boiler affects its performance characteristics. 3 figs

  19. Optimisation of Marine Boilers using Model-based Multivariable Control

    DEFF Research Database (Denmark)

    Solberg, Brian

    Traditionally, marine boilers have been controlled using classical single loop controllers. To optimise marine boiler performance, reduce new installation time and minimise the physical dimensions of these large steel constructions, a more comprehensive and coherent control strategy is needed....... This research deals with the application of advanced control to a specific class of marine boilers combining well-known design methods for multivariable systems. This thesis presents contributions for modelling and control of the one-pass smoke tube marine boilers as well as for hybrid systems control. Much...... of the focus has been directed towards water level control which is complicated by the nature of the disturbances acting on the system as well as by low frequency sensor noise. This focus was motivated by an estimated large potential to minimise the boiler geometry by reducing water level fluctuations...

  20. The structure and behavior of salts in kraft recovery boilers

    Energy Technology Data Exchange (ETDEWEB)

    Backman, R.; Badoi, R.D.; Enestam, S. [Aabo Akademi Univ., Turku (Finland). Combustion Chemistry Research Group

    1997-10-01

    The melting behavior in the salt system (Na,K)(CO{sub 3},SO{sub 4},S,Cl,OH) is investigated by laboratory methods to enhance and further develop a chemical model for salt mixtures with compositions relevant for recovery boilers. The model, based on both literature data and experimental work can be used as (a) submodel in models for the over-all chemistry in recovery boilers and to estimate (b) deposit formation on heat transfer surfaces (fouling), (c) the melting properties of the fly ash, and (d) the smelt bed in recovery boilers. Experimental techniques used are thermal analysis, high temperature microscopy` and scanning electron microscopy. The model is implemented in a global calculation model which can handle both gas phases and condensed phases in the recovery boiler. The model gives a detailed description of the chemical reactions involved in the fume and dust formation in different locations of the flue gas channel in the boiler. (orig.)

  1. Boiling process modelling peculiarities analysis of the vacuum boiler

    Science.gov (United States)

    Slobodina, E. N.; Mikhailov, A. G.

    2017-06-01

    The analysis of the low and medium powered boiler equipment development was carried out, boiler units possible development directions with the purpose of energy efficiency improvement were identified. Engineering studies for the vacuum boilers applying are represented. Vacuum boiler heat-exchange processes where boiling water is the working body are considered. Heat-exchange intensification method under boiling at the maximum heat- transfer coefficient is examined. As a result of the conducted calculation studies, heat-transfer coefficients variation curves depending on the pressure, calculated through the analytical and numerical methodologies were obtained. The conclusion about the possibility of numerical computing method application through RPI ANSYS CFX for the boiling process description in boiler vacuum volume was given.

  2. Contaminación del agua

    OpenAIRE

    Abarca Monge, Sergio; Mora Brenes, Bernardo

    2016-01-01

    En este artículo se reflexiona acerca de los factores que inciden en la contaminación del recurso hídrico y sus efectos sobre la calidad de vida y la salud de la población. Se señala que el agua potable no solo se contamina de forma natural, sino también por diferentes sustancias introducidas por actividades humanas en campos como la industria y la agricultura. No obstante, el mayor riesgo para la salud de la población lo representan los diferentes patógenos causantes de enfermedades mediante...

  3. Lahar hazards at Agua volcano, Guatemala

    Science.gov (United States)

    Schilling, S.P.; Vallance, J.W.; Matías, O.; Howell, M.M.

    2001-01-01

    At 3760 m, Agua volcano towers more than 3500 m above the Pacific coastal plain to the south and 2000 m above the Guatemalan highlands to the north. The volcano is within 5 to 10 kilometers (km) of Antigua, Guatemala and several other large towns situated on its northern apron. These towns have a combined population of nearly 100,000. It is within about 20 km of Escuintla (population, ca. 100,000) to the south. Though the volcano has not been active in historical time, or about the last 500 years, it has the potential to produce debris flows (watery flows of mud, rock, and debris—also known as lahars when they occur on a volcano) that could inundate these nearby populated areas.

  4. Repercusiones sanitarias de la calidad del agua: los residuos de medicamentos en el agua

    Directory of Open Access Journals (Sweden)

    Cristina Postigo Rebollo

    2011-12-01

    Full Text Available Este trabajo resume varios estudios de monitorización de fármacos y drogas de abuso llevados a cabo en el medio ambiente acuático de las cuencas de los ríos Llobregat y Ebro con el fin de evaluar la calidad del agua en relación a la presencia de estas substancias y su potencial riesgo para la salud ambiental y pública. La identificación de estos compuestos aguas abajo del punto de vertido de las plantas depuradoras apunta a la descarga de agua residual tratada como la principal fuente de emisión de estos contaminantes en el medio acuático. El perfil de contaminación por fármacos fue bastante similar en ambas cuencas. No obstante, los índices de riesgo (HQ calculados para los fármacos en diferentes niveles tróficos (algas, dáfnidos y peces indican que los compuestos que presentan un mayor riesgo ecotóxico en el Llobregat son el sulfametoxazol (antibiótico sulfamida para las algas, el gemfibrozil (regulador de lípidos para las algas y los peces, el ácido clofíbrico (regulador de lípidos y la eritromicina (antibiótico macrólido para los dáfnidos, y el ibuprofeno (analgésico anti-inflamatorio para todos los eslabones tróficos. En el Ebro, los compuestos más problemáticos son el sulfametoxazol para las algas, y la eritromicina, el ácido clofíbrico y la fluoxetina (antidepresivo para los dáfnidos.Los niveles de drogas de abuso (y sus metabolitos determinados en la cuenca del Ebro son aproximadamente uno y dos órdenes de magnitud más bajos respectivamente que los determinados en las aguas de salida y de entrada a las depuradoras. Sin embargo, debido a la falta de datos sobre su ecotoxicidad, no se han podido calcular índices de riesgo.La presencia de estos compuestos (fármacos y drogas en aguas superficiales y de bebida aun no está regulada y, por lo tanto, no constituyen parámetros de obligado control. Aún es imprescindible seguir investigando para poder evaluar su posible efecto en la salud humana.

  5. Abasto del agua en la frontera norte de Tamaulipas

    Directory of Open Access Journals (Sweden)

    Jesús FRAUSTO ORTEGA

    2016-01-01

    Full Text Available El trabajo ref lexiona sobre el abasto de agua potable en los municipios fronterizos del norte de Tamaulipas, a partir de la perspectiva del derecho humano al agua ( DHA . Se responde la pregunta: ¿cómo se ha desarrollado la cobertura de agua potable en esos municipios? Se revisan estadísticas del Inegi de 1990 a 2010, ejemplares del Periódico o f icial del estado y diversas fuen - tes secundarias. Se encuentra que hay coberturas altas, tanto en agua potable como en drenaje, superiores a los promedios nacional y regional. Sin embargo, aún existe población sin acceso a estos servicios en sus viviendas y que, utilizando el DHA como una herramienta de gestión, puede demandar la dotación de esos servicios.

  6. Administración del agua. - Introducción

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  7. Administración del agua. - Créditos

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  8. Administración del agua. - Conclusiones generales

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  9. Biomass boilers: towards a higher efficiency

    International Nuclear Information System (INIS)

    Petitot, Pauline; Signoret, Stephane; Mary, Olivier; Dejeu, Mathieu; Tachet, Jean-Pierre

    2014-01-01

    A set of articles proposes an overview of the situation and perspectives of biomass fuelled boilers in France. As outlined in an interview, professionals are supported by ADEME and the Heat Fund (Fonds Chaleur) for a continuous development of wood-energy in order to reach national objectives for renewable energies by 2020. The next article discusses issues related to wood supply, with some concerns regarding forest exploitation, and needs to find new management ways and to use other sources than forests. The technical status and perspectives of smoke condensation in wood-fuelled boilers are discussed. The example of a malt-house near Issoudun fuelled by biomass since 2013 is presented. Other examples concern a small town of Burgundy which developed and is still improving a heat network, a wood-fuelled heat network in Saint-Denis, and a biomass wood-fuelled heat production plant for the Toulouse University hospital. Graphs indicate evolutions of prices for different wood-based fuel products. The last article outlines the role of forests and the importance of their protection in the struggle against climate change, and discusses problems faced to support this preservation and its financing

  10. Mercury emissions from polish pulverized coalfired boiler

    Directory of Open Access Journals (Sweden)

    Wichliński Michał

    2017-01-01

    Full Text Available The current paper presents the research results carried out at one of Polish power plants at a pulverized hard coal-fired 225 MW unit. The research was carried out at full load of the boiler (100% MCR and focused on analysis of mercury content in the input fuel and limestone sorbent for wet flue gas desulfurization (FGD system, as well as investigation of mercury content in the combustion products, i.e. fly ash, slag, FGD product (gypsum and FGD effluents (waste. Within the framework of the present study the concentration of mercury vapor in the exhaust gas was also investigated. The analysis was performed using Lumex RA-915+ spectrometer with an attachment (RP-91C. The measurements were carried out at three locations, i.e. before the electrostatic precipitator (ESP, downstream the ESP, and downstream the wet FGD plant. Design of the measurement system allowed to determine both forms of mercury in the flue gas (Hg0 and Hg2+ at all measurement locations.Based on the measurement results the balance of mercury for a pulverized coal (PC boiler was calculated and the amount of mercury was assessed both in the input solids (fuel and sorbent, as well as the gaseous and solids products (flue gas, slag, ash, gypsum and FGD waste.

  11. Code boiler and pressure vessel life assessment

    International Nuclear Information System (INIS)

    Farr, J.R.

    1992-01-01

    In the United States of America and in Canada, laws and controls for determining life assessment for continued operation of equipment exist only for those pressure vessels built to Section III and evaluated according to Section XI. In this presentation, some of those considerations which are made in the USA and Canada for deciding on life or condition assessment of boilers and pressure vessels designed and constructed to other sections of the ASME Boiler and Pressure Vessel Code are reviewed. Life assessment or condition assesssment is essential in determining what is necessary for continued operation. With no ASME rules being adopted by laws or regulations, other than OSHA in the USA and similar environmental controls in Canada, to control life assessment for continued operation, the equipment owner must decide if assessment is to be done and how much to do. Some of those considerations are reviewed along with methods and procedures to make an assessment along with a discussion of where the ASME B and PV Code currently stands regarding continued operation. (orig.)

  12. Establishing an energy efficiency recommendation for commercial boilers

    International Nuclear Information System (INIS)

    Ware, Michelle J.

    2000-01-01

    To assist the federal government in meeting its energy reduction goals, President Clinton's Executive Order 12902 established the Procurement Challenge, which directed all federal agencies to purchase equipment within the top 25th percentile of efficiency. Under the direction of DOE's Federal Energy Management Program (FEMP), the Procurement Challenge's goal is to create efficiency recommendations for all energy-using products that could substantially impact the government's energy reduction goals, like commercial boilers. A typical 5,000,000 Btuh boiler, with a thermal efficiency of 83.2%, can have lifetime energy cost savings of$40,000 when compared to a boiler with a thermal efficiency of 78%. For the federal market, which makes up 2% of the boiler market, this means lifetime energy cost savings of over$25,600,000. To establish efficiency recommendations, FEMP uses standardized performance ratings for products sold in the marketplace. Currently, the boiler industry uses combustion efficiency and, sometimes, thermal efficiency performance measures when specifying a commercial boiler. For many years, the industry has used these efficiency measures interchangeably, causing confusion about boiler performance measurements, and making it difficult for FEMP to establish the top 25th percentile of efficiency. This paper will illustrate the method used to establish FEMP's recommendation for boilers. The method involved defining a correlation between thermal and combustion efficiency among boiler classifications; using the correlation to model a data set of all the boiler types available in the market; and identifying how the correlation affected the top 25th percentile analysis. The paper also will discuss the applicability of this method for evaluating other equipment for which there are limited data on performance ratings

  13. Administración del agua. - Capítulo X: Administración centralizada del agua en Venezuela

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  14. Administración del agua. - Capítulo II: Organización administrativa del agua.

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  15. Estudio de la calidad del agua en cisternas de captación de agua de lluvia en escuelas rurales de Alagoas (Brasil)

    OpenAIRE

    Gonzalez Abelleira, Mafalda

    2014-01-01

    El presente trabajo se centra en el estudio de la calidad del agua de Sistemas de Recogida de agua de lluvia en escuelas del Semiárido Alagoano de Brasil. Aspectos de la obra civil también son incluidos. Los Sistemas principalmente están formados por un área de captación de agua de lluvia, cisternas de placas de cemento, canalizaciones que las unen y una bomba manual para la retirada del agua de la cisterna. Se analizaron 206 muestras de parámetros básicos de la calidad del agua – conducti...

  16. EVALUACIÓN DE LA CALIDAD MICROBIOLÓGICA DEL AGUA PARA CONSUMO Y DEL AGUA RESIDUAL EN UNA POBLACIÓN DE BOGOTÁ (COLOMBIA)

    OpenAIRE

    Venegas B, Camilo; Mercado R, Marcela; Campos, María Claudia

    2014-01-01

    En Colombia el acceso al agua potable y a sistemas de saneamiento no están garantizados para buena parte de la población, por lo que el consumo de agua contaminada genera enfermedades de origen hídrico. La alternativa más utilizada para el acceso al agua potable es su almacenamiento dentro de las viviendas y la improvisación de sistemas de alcantarillado que generalmente se encuentran a cielo abierto. Objetivo: Evaluar la calidad microbiológica del agua utilizada para consumo y el agua residu...

  17. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman

    2003-01-20

    The principal objective of this project is to develop materials technology for use in ultrasupercritical (USC) plant boilers capable of operating with 760 C (1400 F), 35 MPa (5000 psi) steam. In the 21st century, the world faces the critical challenge of providing abundant, cheap electricity to meet the needs of a growing global population while at the same time preserving environmental values. Most studies of this issue conclude that a robust portfolio of generation technologies and fuels should be developed to assure that the United States will have adequate electricity supplies in a variety of possible future scenarios. The use of coal for electricity generation poses a unique set of challenges. On the one hand, coal is plentiful and available at low cost in much of the world, notably in the U.S., China, and India. Countries with large coal reserves will want to develop them to foster economic growth and energy security. On the other hand, traditional methods of coal combustion emit pollutants and CO{sub 2} at high levels relative to other generation options. Maintaining coal as a generation option in the 21st century will require methods for addressing these environmental issues. This project has established a government/industry consortium to undertake a five-year effort to evaluate and develop of advanced materials that allow the use of advanced steam cycles in coal-based power plants. These advanced cycles, with steam temperatures up to 760 C, will increase the efficiency of coal-fired boilers from an average of 35% efficiency (current domestic fleet) to 47% (HHV). This efficiency increase will enable coal-fired power plants to generate electricity at competitive rates (irrespective of fuel costs) while reducing CO{sub 2} and other fuel-related emissions by as much as 29%. Success in achieving these objectives will support a number of broader goals. First, from a national prospective, the program will identify advanced materials that will make it possible to

  18. A novel direct-fired porous-medium boiler

    Science.gov (United States)

    Prasartkaew, Boonrit

    2018-01-01

    Nowadays, power and heat generation systems pay an important role in all economic sectors. These systems are mainly based on combustion reaction and operated under the second law of thermodynamics. A conventional boilers, a main component of heat and power generators, have thermal efficiency in the range of 70 to 85%, mainly owing to they have flue gas heat loss. This paper proposes a novel type of boiler, called a Direct-fired Porous-medium Boiler (DPB). Due to being operated without flue gas heat loss, its thermal efficiency cloud be approximately close to 100%. The steam produced from the proposed boiler; however, is not pure water steam. It is the composite gases of steam and combustion-product-gases. This paper aims at presenting the working concept and reporting the experimental results on the performance of the proposed boiler. The experiments of various operating parameters were performed and collected data were used for the performance analysis. The experimental results demonstrated that the proposed boiler can be operated as well as the conceptual design and then it is promising. It can be possibly further developed to be a high efficiency boiler by means of reducing or suppressing the surface heat loss with better insulator and/or refractory lined.

  19. Cross connecting absorber module inlets of multiple boiler units

    International Nuclear Information System (INIS)

    Cirillo, A.J.; Sperber, P.K.; Belavadi, V.N.; Mukherji, A.

    1991-01-01

    The retrofitting of scrubbers downstream of existing balanced draft boilers is often accomplished by the addition of induced draft (ID) booster fans. By creating a common plenum between the ID fans and the ID booster fans of two or more boiler-absorber trains, absorber module capacity may be shared among multiple boiler units. At Harrison Power Station, three (3) 4,900,000 lb/hour boilers (640 MWe Gross) will be linked through a common plenum. This sharing capability precludes the need to add standby module capacity, thereby saving capital dollars and keeping project critical path schedules, which typically run through absorber procurement and construction, to a minimum. Through damper placement in the ductwork cross connections, unitized boiler-absorber module operation or common plenum operation may be obtained, thus providing both operational flexibility and reliability. Additionally, open plenum operation allows the removal of an absorber unit from service, while keeping its associated boiler on line, thereby precluding 'cold starts' and maintaining overall unit availabilities. As either unitized or common plenum operation is possible with the cross connection, the furnace draft control systems of each boiler must be examined for varying load operation and trip conditions. This paper addresses the means by which to analyze such cross connection operational scenarios while maintaining compliance with furnace flame out safety guidelines, and will discuss the physical design considerations, ramifications and benefits of same, with select emphasis on what is being implemented at the Harrison Power Station

  20. Supercritical boiler material selection using fuzzy analytic network process

    Directory of Open Access Journals (Sweden)

    Saikat Ranjan Maity

    2012-08-01

    Full Text Available The recent development of world is being adversely affected by the scarcity of power and energy. To survive in the next generation, it is thus necessary to explore the non-conventional energy sources and efficiently consume the available sources. For efficient exploitation of the existing energy sources, a great scope lies in the use of Rankin cycle-based thermal power plants. Today, the gross efficiency of Rankin cycle-based thermal power plants is less than 28% which has been increased up to 40% with reheating and regenerative cycles. But, it can be further improved up to 47% by using supercritical power plant technology. Supercritical power plants use supercritical boilers which are able to withstand a very high temperature (650-720˚C and pressure (22.1 MPa while producing superheated steam. The thermal efficiency of a supercritical boiler greatly depends on the material of its different components. The supercritical boiler material should possess high creep rupture strength, high thermal conductivity, low thermal expansion, high specific heat and very high temperature withstandability. This paper considers a list of seven supercritical boiler materials whose performance is evaluated based on seven pivotal criteria. Given the intricacy and difficulty of this supercritical boiler material selection problem having interactions and interdependencies between different criteria, this paper applies fuzzy analytic network process to select the most appropriate material for a supercritical boiler. Rene 41 is the best supercritical boiler material, whereas, Haynes 230 is the worst preferred choice.

  1. Up-date on cyclone combustion and cyclone boilers

    Energy Technology Data Exchange (ETDEWEB)

    Carmo, Felipe Alfaia do; Nogueira, Manoel Fernandes Martins; Rocha, Rodrigo Carnera Castro da; Gazel, Hussein Felix; Martins, Diego Henrique dos Reis [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Campus Universitario Jose da Silveira Netto], E-mails: mfmn@ufpa.br, mfmn@ufpa.br

    2010-07-01

    The boiler concept has been around for more than 70 years, and there are many types available. Boilers provide steam or hot water for industrial and commercial use. The Federal University of Para (UFPA) through the research group EBMA (Energy,Biomass and Environment) has been developing cyclonic furnace with a water wall, a boiler, aiming to use regional timbers (sawdust) and agro-industries residues as fuel to produce steam to be used in industrial processes as well as in power generation,. The use of cyclonic combustion for burning waste instead of burning in a fixed bed is mainly due to two factors efficiency improvement causing a more compact boiler and less risk of explosion, since their process does not generate an accumulation of volatile. Present state-of-art for commercial cyclone boilers has as set up a cyclone combustor with two combustion chambers, in fluid communication, where there ducts for supplying air and fuel directly into the first chamber and for forming a cyclonic flow pattern and a heat exchanger surrounding the second chamber for keeping low combustion temperature in both chambers. This paper shows the results of a literature review about design, construction and operation of cyclonic boilers using solid, liquid or gaseous fuel. This information has been used for the design of a cyclone boiler to be constructed at UFPA for research purposes and its basic concept is presented at the end of this article. (author)

  2. Evaluation of conditions of SNCR in small boilers

    International Nuclear Information System (INIS)

    Kullendorff, A.; Lorentzon, K.

    1996-04-01

    The report describes the first part of a project 'SNCR for small boilers', supported by Vaermeforsk (Thermal Engineering Research Institute), with the purpose of assessing the potential for SNCR in small boilers. Given favourable conditions, the project was to be continued in a second part with the demonstration of a SNCR system in a small boiler (or several boilers). During the base establishment, the temperatures in four locations per boiler, in a couple of horizontal or vertical levels and at 2-3 thermal outputs, were measured. Out of the four locations two showed temperatures mainly within the theoretical temperature window for SNCR. These locations were used during the try-out tests to inject urea and ammonia. The locations and the equipment used during the try-out tests together with existing operation strategies seem to limit the reduction levels to approximately 10-20% at acceptable levels of ammonia slip. The measurements and try-out tests carried out does not provide enough basis for forming any general conclusions concerning SNCR in small boilers. Neither the base establishment nor the try-out tests included any optimisation of the boilers regarding the operation strategy or, for the try-out tests, locations and equipment (drop size, flow shape and direction). Therefore, it is likely to believe that better results can be obtained, given other conditions of operation and using well established SNCR technology, adapted to the circumstances. 2 refs, 27 figs, 5 tabs

  3. 46 CFR 52.20-17 - Opening between boiler and safety valve (modifies PFT-44).

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Opening between boiler and safety valve (modifies PFT-44). 52.20-17 Section 52.20-17 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) MARINE ENGINEERING POWER BOILERS Requirements for Firetube Boilers § 52.20-17 Opening between boiler and safety valve...

  4. 40 CFR 266.110 - Waiver of DRE trial burn for boilers.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 26 2010-07-01 2010-07-01 false Waiver of DRE trial burn for boilers... HAZARDOUS WASTE MANAGEMENT FACILITIES Hazardous Waste Burned in Boilers and Industrial Furnaces § 266.110 Waiver of DRE trial burn for boilers. Boilers that operate under the special requirements of this section...

  5. 9 CFR 91.22 - Protection from heat of boilers and engines.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 1 2010-01-01 2010-01-01 false Protection from heat of boilers and... Protection from heat of boilers and engines. No animals shall be stowed along the alleyways leading to the engine or boiler rooms unless the sides of said engine or boiler rooms are covered by a tongue and groove...

  6. 46 CFR 91.15-1 - Standards in inspection of hulls, boilers, and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Standards in inspection of hulls, boilers, and machinery... hulls, boilers, and machinery. In the inspection of hulls, boilers, and machinery of vessels, the..., respecting material and inspection of hulls, boilers, and machinery, and the certificate of classification...

  7. 30 CFR 57.13001 - General requirements for boilers and pressure vessels.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false General requirements for boilers and pressure... NONMETAL MINES Compressed Air and Boilers § 57.13001 General requirements for boilers and pressure vessels. All boilers and pressure vessels shall be constructed, installed, and maintained in accordance with...

  8. 40 CFR 63.7506 - Do any boilers or process heaters have limited requirements?

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 13 2010-07-01 2010-07-01 false Do any boilers or process heaters have..., and Institutional Boilers and Process Heaters General Compliance Requirements § 63.7506 Do any boilers or process heaters have limited requirements? (a) New or reconstructed boilers and process heaters in...

  9. 46 CFR 189.15-1 - Standards in inspection of hulls, boilers, and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Standards in inspection of hulls, boilers, and machinery... inspection of hulls, boilers, and machinery. In the inspection of hulls, boilers, and machinery of vessels... chapter, respecting material and construction of hulls, boilers, and machinery, and certificate of...

  10. 49 CFR 230.20 - Alteration and repair report for steam locomotive boilers.

    Science.gov (United States)

    2010-10-01

    ... boilers. 230.20 Section 230.20 Transportation Other Regulations Relating to Transportation (Continued... boilers. (a) Alterations. When an alteration is made to a steam locomotive boiler, the steam locomotive... maintained for the life of the boiler. (See appendix B of this part.) (b) Welded and riveted repairs to...

  11. 46 CFR 61.05-5 - Preparation of boilers for inspection and test.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Preparation of boilers for inspection and test. 61.05-5... PERIODIC TESTS AND INSPECTIONS Tests and Inspections of Boilers § 61.05-5 Preparation of boilers for... preparing the boilers for the hydrostatic test, they shall be filled with water at not less than 70 °F. and...

  12. 40 CFR 63.7491 - Are any boilers or process heaters not subject to this subpart?

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 13 2010-07-01 2010-07-01 false Are any boilers or process heaters not..., and Institutional Boilers and Process Heaters What This Subpart Covers § 63.7491 Are any boilers or process heaters not subject to this subpart? The types of boilers and process heaters listed in paragraphs...

  13. 40 CFR 63.7499 - What are the subcategories of boilers and process heaters?

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 13 2010-07-01 2010-07-01 false What are the subcategories of boilers..., and Institutional Boilers and Process Heaters Emission Limits and Work Practice Standards § 63.7499 What are the subcategories of boilers and process heaters? The subcategories of boilers and process...

  14. 46 CFR 71.15-1 - Standards in inspection of hulls, boilers, and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 3 2010-10-01 2010-10-01 false Standards in inspection of hulls, boilers, and machinery..., boilers, and machinery. In the inspection of hulls, boilers, and machinery of vessels, the standards... and inspection of hulls, boilers, and machinery, and the certificate of classification referring...

  15. 30 CFR 56.13001 - General requirements for boilers and pressure vessels.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false General requirements for boilers and pressure... MINES Compressed Air and Boilers § 56.13001 General requirements for boilers and pressure vessels. All boilers and pressure vessels shall be constructed, installed, and maintained in accordance with the...

  16. El régimen jurídico de las aguas para usos agrícolas: aguas subterráneas

    Directory of Open Access Journals (Sweden)

    Fernando Brebbia

    2015-01-01

    Full Text Available Como ha señalado el profesor Adolfo Gelsi Bidart la relación entre tierra yagua es alguno de los aspectos que el derecho agrario debe tener en cuenta y ello importa establecer si la regulación de las aguas compete al derecho agrario, constituye una disciplina autónoma, o bien si su estudio corresponde a diversas ramas del derecho cada una de las cuales debe ocuparse de examinar determinados aspectos, o mejor, de distintas formas de su uso y aprovechamientol (...Contenido: Derecho agrario y derecho de aguas. Algunos datos estadísticos acerca del agua. Los usos del agua. Aguas públicas y aguas privadas. La utilización del agua para la agricultura. El tratamiento legal de las aguas para la agricultura en los países del Mercosur: Argentina, Brasil, Paraguay, Uruguay. Evolución legislativa del régimen de las aguas subterráneas en el derecho agrario comparado. Modernas tendencias sobre el dominio de las aguas subterráneas. Las leyes de aguas de España e Italia

  17. Apparatus and method of controlling the thermal performance of an oxygen-fired boiler

    Science.gov (United States)

    Levasseur, Armand A.; Kang, Shin G.; Kenney, James R.; Edberg, Carl D.

    2017-09-05

    Disclosed herein is a method of controlling the operation of an oxy-fired boiler; the method comprising combusting a fuel in a boiler; producing a heat absorption pattern in the boiler; discharging flue gases from the boiler; recycling a portion of the flue gases to the boiler; combining a first oxidant stream with the recycled flue gases to form a combined stream; splitting the combined stream into several fractions; and introducing each fraction of the combined stream to the boiler at different points of entry to the boiler.

  18. Failure Analysis Of Industrial Boiler Pipe

    International Nuclear Information System (INIS)

    Natsir, Muhammad; Soedardjo, B.; Arhatari, Dewi; Andryansyah; Haryanto, Mudi; Triyadi, Ari

    2000-01-01

    Failure analysis of industrial boiler pipe has been done. The tested pipe material is carbon steel SA 178 Grade A refer to specification data which taken from Fertilizer Company. Steps in analysis were ; collection of background operation and material specification, visual inspection, dye penetrant test, radiography test, chemical composition test, hardness test, metallography test. From the test and analysis result, it is shown that the pipe failure caused by erosion and welding was shown porosity and incomplete penetration. The main cause of failure pipe is erosion due to cavitation, which decreases the pipe thickness. Break in pipe thickness can be done due to decreasing in pipe thickness. To anticipate this problem, the ppe will be replaced with new pipe

  19. CHP Integrated with Burners for Packaged Boilers

    Energy Technology Data Exchange (ETDEWEB)

    Castaldini, Carlo; Darby, Eric

    2013-09-30

    The objective of this project was to engineer, design, fabricate, and field demonstrate a Boiler Burner Energy System Technology (BBEST) that integrates a low-cost, clean burning, gas-fired simple-cycle (unrecuperated) 100 kWe (net) microturbine (SCMT) with a new ultra low-NOx gas-fired burner (ULNB) into one compact Combined Heat and Power (CHP) product that can be retrofit on new and existing industrial and commercial boilers in place of conventional burners. The Scope of Work for this project was segmented into two principal phases: (Phase I) Hardware development, assembly and pre-test and (Phase II) Field installation and demonstration testing. Phase I was divided into five technical tasks (Task 2 to 6). These tasks covered the engineering, design, fabrication, testing and optimization of each key component of the CHP system principally, ULNB, SCMT, assembly BBEST CHP package, and integrated controls. Phase I work culminated with the laboratory testing of the completed BBEST assembly prior to shipment for field installation and demonstration. Phase II consisted of two remaining technical tasks (Task 7 and 8), which focused on the installation, startup, and field verification tests at a pre-selected industrial plant to document performance and attainment of all project objectives. Technical direction and administration was under the management of CMCE, Inc. Altex Technologies Corporation lead the design, assembly and testing of the system. Field demonstration was supported by Leva Energy, the commercialization firm founded by executives at CMCE and Altex. Leva Energy has applied for patent protection on the BBEST process under the trade name of Power Burner and holds the license for the burner currently used in the product. The commercial term Power Burner is used throughout this report to refer to the BBEST technology proposed for this project. The project was co-funded by the California Energy Commission and the Southern California Gas Company (SCG), a

  20. Model technique for aerodynamic study of boiler furnace

    Energy Technology Data Exchange (ETDEWEB)

    1966-02-01

    The help of the Division was recently sought to improve the heat transfer and reduce the exit gas temperature in a pulverized-fuel-fired boiler at an Australian power station. One approach adopted was to construct from Perspex a 1:20 scale cold-air model of the boiler furnace and to use a flow-visualization technique to study the aerodynamic patterns established when air was introduced through the p.f. burners of the model. The work established good correlations between the behaviour of the model and of the boiler furnace.

  1. Model-based Control of a Bottom Fired Marine Boiler

    DEFF Research Database (Denmark)

    Solberg, Brian; Karstensen, Claus M. S.; Andersen, Palle

    2005-01-01

    This paper focuses on applying model based MIMO control to minimize variations in water level for a specific boiler type. A first principles model is put up. The model is linearized and an LQG controller is designed. Furthermore the benefit of using a steam °ow measurement is compared to a strategy...... relying on estimates of the disturbance. Preliminary tests at the boiler system show that the designed controller is able to control the boiler process. Furthermore it can be concluded that relying on estimates of the steam flow in the control strategy does not decrease the controller performance...

  2. Numerical modelling of a straw-fired grate boiler

    DEFF Research Database (Denmark)

    Kær, Søren Knudsen

    2004-01-01

    The paper presents a computational fluid dynamics (CFD) analysis of a 33 MW straw-fired grate boiler. Combustion on the grate plays akey-role in the analysis of these boilers and in this work a stand-alone code was used to provide inlet conditions for the CFD analysis. Modelpredictions were...... compared with available gas temperature and species concentration measurements showing good agreement. Combustionof biomass in grate-based boilers is often associated with high emission levels and relatively high amounts of unburnt carbon in the fly ash.Based on the CFD analysis, it is suggested that poor...

  3. Vacuum boilers developed heating surfaces technic and economic efficiency evaluation

    Science.gov (United States)

    Slobodina, E. N.; Mikhailov, A. G.; Semenov, B. A.

    2018-01-01

    The vacuum boilers as manufacturing proto types application analysis was carried out, the possible directions for the heating surfaces development are identified with a view to improving the energy efficiency. Economic characteristics to evaluate the vacuum boilers application efficiency (Net Discounted Income (NDI), Internal Rate of Return (IRR), Profitability Index (PI) and Payback Period) are represented. The given type boilers application technic and economic efficiency criteria were established. NDI changing curves depending on the finning coefficient and operating pressure were obtained as a result of the conducted calculation studies.

  4. An optimising controller for Hinkley Point B AGR boilers

    International Nuclear Information System (INIS)

    Wells, C.

    1986-01-01

    The improvements to the control system at Hinkley Point 'B' Power Station has as one of its objectives the provision of a half unit valve controller. This will enable the asymmetry between the boiler half units, which is a feature of current operation, to be reduced. The use of an on-line boiler model in conjunction with this facility will allow the risk to the boilers from corrosion, creep, and vibration to be assessed and held at the minimum attainable value, thereby prolonging plant life whilst maximising output and efficiency. (author)

  5. Model-based Control of a Bottom Fired Marine Boiler

    DEFF Research Database (Denmark)

    Solberg, Brian; Karstensen, Claus M. S.; Andersen, Palle

    This paper focuses on applying model based MIMO control to minimize variations in water level for a specific boiler type. A first principles model is put up. The model is linearized and an LQG controller is designed. Furthermore the benefit of using a steam °ow measurement is compared to a strategy...... relying on estimates of the disturbance. Preliminary tests at the boiler system show that the designed controller is able to control the boiler process. Furthermore it can be concluded that relying on estimates of the steam flow in the control strategy does not decrease the controller performance...

  6. Modelling transition states of a small once-through boiler

    Energy Technology Data Exchange (ETDEWEB)

    Talonpoika, T [Lappeenranta Univ. of Technology (Finland). Dept. of Energy Technology

    1998-12-31

    This article presents a model for the unsteady dynamic behaviour of a once-through counter flow boiler that uses an organic working fluid. The boiler is a compact waste-heat boiler without a furnace and it has a preheater, a vaporiser and a superheater. The relative lengths of the boiler parts vary with the operating conditions since they are all parts of a single tube. The boiler model is presented using a selected example case that uses toluene as the process fluid and flue gas from natural gas combustion as the heat source. The dynamic behaviour of the boiler means transition from the steady initial state towards another steady state that corresponds to the changed process conditions. The solution method chosen is to find such a pressure of the process fluid that the mass of the process fluid in the boiler equals the mass calculated using the mass flows into and out of the boiler during a time step, using the finite difference method. A special method of fast calculation of the thermal properties is used, because most of the calculation time is spent in calculating the fluid properties. The boiler is divided into elements. The values of the thermodynamic properties and mass flows are calculated in the nodes that connect the elements. Dynamic behaviour is limited to the process fluid and tube wall, and the heat source is regarded as to be steady. The elements that connect the preheater to the vaporiser and the vaporiser to the superheater are treated in a special way that takes into account a flexible change from one part to the other. The initial state of the boiler is received from a steady process model that is not a part of the boiler model. The known boundary values that may vary during the dynamic calculation were the inlet temperature and mass flow rates of both the heat source fluid and the process fluid. The dynamic boiler model is analysed for linear and step charges of the entering fluid temperatures and flow rates. The heat source side tests show that

  7. Economical analyses of construction of a biomass boiler house

    International Nuclear Information System (INIS)

    Normak, A.

    2002-01-01

    To reduce the energy costs we can use cheaper fuel to fire our boiler. One of the cheapest fuels is wood biomass. It is very actual issue how to use cheaper wood biomass in heat generation to decrease energy costs and to increase biomass share in our energy balance. Before we decide to build biomass boiler house it is recommendable to analyse the economical situation and work out most profitable, efficient, reliable and ecological boiler plant design on particular conditions. The best way to perform the analyses is to use the economical model presented. It saves our time and gives objective evaluation to the project. (author)

  8. Modelling transition states of a small once-through boiler

    Energy Technology Data Exchange (ETDEWEB)

    Talonpoika, T. [Lappeenranta Univ. of Technology (Finland). Dept. of Energy Technology

    1997-12-31

    This article presents a model for the unsteady dynamic behaviour of a once-through counter flow boiler that uses an organic working fluid. The boiler is a compact waste-heat boiler without a furnace and it has a preheater, a vaporiser and a superheater. The relative lengths of the boiler parts vary with the operating conditions since they are all parts of a single tube. The boiler model is presented using a selected example case that uses toluene as the process fluid and flue gas from natural gas combustion as the heat source. The dynamic behaviour of the boiler means transition from the steady initial state towards another steady state that corresponds to the changed process conditions. The solution method chosen is to find such a pressure of the process fluid that the mass of the process fluid in the boiler equals the mass calculated using the mass flows into and out of the boiler during a time step, using the finite difference method. A special method of fast calculation of the thermal properties is used, because most of the calculation time is spent in calculating the fluid properties. The boiler is divided into elements. The values of the thermodynamic properties and mass flows are calculated in the nodes that connect the elements. Dynamic behaviour is limited to the process fluid and tube wall, and the heat source is regarded as to be steady. The elements that connect the preheater to the vaporiser and the vaporiser to the superheater are treated in a special way that takes into account a flexible change from one part to the other. The initial state of the boiler is received from a steady process model that is not a part of the boiler model. The known boundary values that may vary during the dynamic calculation were the inlet temperature and mass flow rates of both the heat source fluid and the process fluid. The dynamic boiler model is analysed for linear and step charges of the entering fluid temperatures and flow rates. The heat source side tests show that

  9. Maintenance of immersion ultrasonic testing on the water tube boiler

    International Nuclear Information System (INIS)

    Ishiyama, Toru; Kawasaki, Ichio; Miura, Hirohito

    2014-01-01

    There are 4-boiler in nuclear fuel cycle engineering laboratories (NCL). These boilers have been operated in the long term over 20 years. One of them, the leakage of boiler water was found at one of the generating tubes, and 2 adjoining generating tubes were corroded in Dec, 2011. These generating tubes were investigated by immersion ultrasonic testing (UT) for measure thickness of the tube. As a result, thinner tube was found in a part of a bend and near the water drum. These parts are covered with sulfide deposit, it seems that the generating tubes were corroded by sulfide. (author)

  10. Orion Ammonia Boiler System Preflight Test Preparations

    Science.gov (United States)

    Levitt, Julia L.

    2017-01-01

    The Environmental Controls and Life Support Systems (ECLSS) branch at Kennedy Space Center (KSC) is currently undergoing preparations for ground testing of the Orion Multi-Purpose Crew Vehicle (MPCV) to prepare its subsystems for EM-1 (Exploration Mission-1). EM-1, Orions second unmanned flight, is a three-week long lunar mission during which the vehicle will complete a 6-day retrograde lunar orbit before returning to Earth. This paper focuses on the work done during the authors 16-week internship with the Mechanical Engineering Branch of KSCs Engineering Directorate. The authors project involved assisting with the preparations for testing the Orion MPCVs ammonia boiler system. The purpose of the ammonia boiler system is to keep the spacecraft sufficiently cool during the reentry portion of its mission, from service module (SM) separation to post-landing. This system is critical for keeping both the spacecraft (avionics and electronics) and crew alive during reentry, thus a successful test of the system is essential to the success of EM-1. XXXX The author was able to draft a detailed outline of the procedure for the ammonia system functional test. More work will need to be done on the vehicle power-up and power-down portions of the procedure, but the ammonia system testing portion of the procedure is thorough and includes vehicle test configurations, vehicle commands, and GSE. The author was able to compile a substantial list of questions regarding the ammonia system functional test with the help of her mentors. A significant number of these questions were answered in the teleconferences with Lockheed Martin.

  11. Que es lo que queda cuando el agua se va

    Directory of Open Access Journals (Sweden)

    Hernán Ascui Fernández

    2007-10-01

    Full Text Available El agua siempre deja huellas de su paso. Las aguas del Nilo, después de inundar las llanuras del río, se retiraban dejando el suelo colmado de los nutrientes que habían traído desde el corazón de África. Las costas de Chile han sido modeladas por el ir y venir de las aguas marinas, el río Ibáñez ha esculpido un profundo canal en la roca para abrirse paso, dando nacimiento a un magnífico lugar conocido como Garganta del río Ibáñez. Las cascadas horadan montañas para poder deslizarse como blancas lágrimas, la sobrecogedora belleza de los glaciares ha dejado potentes huellas de sus trayectorias. La lluvia también deposita marcas en los lugares y superficies que moja. A veces son apenas sutiles señales como el musgo que crece en las piedras húmedas o en el perfume de los bosques de Valdivia, con su tierra negra y empapada de lluvia y rocío. Otras veces las huellas del agua están presentes en la arquitectura como ocurre con los palafitos de Castro o Caleta Tortel, donde las casas se levantan para tomar distancia del agua que se mueve al ritmo de las mareas. En otras ocasiones, las huellas del descorren el velo de un drama urbano; es lo que ocurrió con la inundación del invierno pasado. Las huellas del agua aún son visibles en las paredes manchadas, en los muebles, en los pisos. El agua se fue pero dejando tras de sí un desalentador recuerdo de su paso por las ciudades, los pueblos y las casas.

  12. Smooth Surfaces: A review of current and planned smooth surface technologies for fouling resistance in boiler

    Energy Technology Data Exchange (ETDEWEB)

    Corkery, Robert; Baefver, Linda; Davidsson, Kent; Feiler, Adam

    2012-02-15

    Here we have described the basics of boilers, fuels, combustion, flue gas composition and mechanisms of deposition. We have reviewed coating technologies for boiler tubes, including their materials compositions, nano structures and performances. The surface forces in boilers, in particular those relevant to formation of unwanted deposits in boilers have also been reviewed, and some comparative calculations have been included to indicate the procedures needed for further study. Finally practical recommendations on the important considerations in minimizing deposition on boiler surfaces are made

  13. Numerical simulation of a biomass fired grate boiler

    DEFF Research Database (Denmark)

    Yin, Chungen; Rosendahl, Lasse; Kær, Søren Knudsen

    2006-01-01

    Computational fluid dynamic (CFD) analysis of the thermal flow in the combustion furnace of a biomass-fired grate boiler provides crucial insight into the boiler's performance. Quite a few factors play important roles in a general CFD analysis, such as grid, models, discretization scheme and so on....... For a grate boiler, the modeling the interaction of the fuel bed and the gas phase above the bed is also essential. Much effort can be found in literature on developing bed models whose results are introduced into CFD simulations of freeboard as inlet conditions. This paper presents a CFD analysis...... of the largest biomass-fired grate boiler in Denmark. The focus of this paper is to study how significantly an accurate bed model can affect overall CFD results, i.e., how necessarily it is to develop an accurate bed model in terms of the reliability of CFD results. The ultimate purpose of the study is to obtain...

  14. Criteria of choosing building structures for rooftop boiler rooms

    Directory of Open Access Journals (Sweden)

    Plotnikov Artyom

    2018-01-01

    Full Text Available The paper investigates parameters of noise and vibration distribution in the territory of residential area depending on the structural materials and power of independent heat supply systems. Rooftop boiler rooms are decentralized heat supply systems in buildings. Today, residential areas are strongly affected by noise and vibrations. Adverse effects are isolated by buildings materials, protective shields and floating floors. Rooftop boiler rooms located in Tyumen city were investigated within this research. Structures of rooftop boiler rooms were analyzed. Acoustic analysis results and the parameters of equivalent continuous sound level are presented. An option for improvement of rooftop boiler rooms structures is suggested. Comparison of capital investments in construction and installation activities is carried out. Conclusion on capital investments required for noise protection is made.

  15. Emissions from Power Plant and Industrial Boiler Sector

    Data.gov (United States)

    U.S. Environmental Protection Agency — This asset provides hourly data on SO2, NOx, and CO2 emissions; gross load, steam load, and heat input; from electricity generation units and industrial boilers from...

  16. Knowledge based system for fouling assessment of power plant boiler

    International Nuclear Information System (INIS)

    Afgan, N.H.; He, X.; Carvalho, M.G.; Azevedo, J.L.T.

    1999-01-01

    The paper presents the design of an expert system for fouling assessment in power plant boilers. It is an on-line expert system based on selected criteria for the fouling assessment. Using criteria for fouling assessment based on 'clean' and 'not-clean' radiation heat flux measurements, the diagnostic variable are defined for the boiler heat transfer surface. The development of the prototype knowledge-based system for fouling assessment in power plants boiler comprise the integrations of the elements including knowledge base, inference procedure and prototype configuration. Demonstration of the prototype knowledge-based system for fouling assessment was performed on the Sines power plant. It is a 300 MW coal fired power plant. 12 fields are used with 3 on each side of boiler

  17. Numerical investigation of ash deposition in straw-fired boilers

    DEFF Research Database (Denmark)

    Kær, Søren Knudsen

    in the design phase of straw-fired boilers. Some of the primary model outputs include improved heat transfer rate predictions and detailed information about local deposit formation rates. This information is essential when boiler availability and efficiency is to be estimated. A stand-alone program has been...... accumulation rates encountered during straw combustion in grate-fired boilers. The sub-models have been based on information about the combustion and deposition properties of straw gathered from the literature and combined into a single Computational Fluid Dynamics (CFD) based analysis tool which can aid...... transfer mechanisms have a pronounced influence on the combustion pattern. The combined set of sub-models has been evaluated using the straw-fired boiler at Masnedø CHP plant as a test case. The predicted grate combustion and KCl release patterns are in qualitative agreement with experimental findings...

  18. Boiler for combustion fuel in a fluidized bed

    Directory of Open Access Journals (Sweden)

    Laković Mirjana S.

    2015-01-01

    Full Text Available Fuel combustion in fluidized bed combustion is a process that is current and which every day gives more attention and there are many studies that have been closely associated with this technology. This combustion technology is widespread and constantly improving the range of benefits it provides primarily due to reduced emissions. This paper presents the boilers for combustion in a fluidized bed, whit characteristics and advantages. Also is shown the development of this type of boilers in Republic of Serbia. In this paper is explained the concept of fluidized bed combustion. Boilers for this type of combustion can be improved and thereby increase their efficiency level. More detailed characteristics are given for boilers with bubbling and circulating fluidized bed as well as their mutual comparison.

  19. Energy efficiency in boilers; Eficiencia energetica em caldeiras

    Energy Technology Data Exchange (ETDEWEB)

    Ponte, Ricardo Silva The [Universidade Federal do Ceara (UFCE), Fortaleza, CE (Brazil). Dept. de Engenharia Eletrica], email: ricthe@dee.ufc.br; Barbosa, Marcos Antonio Pinheiro; Rufino, Maria da Gracas [Universidade de Fortaleza (UNIFOR), CE (Brazil). Dept. de Engenharia Eletrica], emails: marcos_apb@unifor.br, gsrufino@unifor.br

    2010-07-01

    The boiler is vapor generator equipment that has been widely used in industrial milieu as in electric energy generation in thermoelectric plants. Since their first conception, the boilers have been changed in order to provide security and energetic efficiency. They can present high losses of energy if they don't be operated according to some criteria. A considerable part of boilers operation cost include fuel expenses. So, the adoption of effective steps in order to reduce fuel consumption is important to industry economy, besides it brings environmental benefits through the reduction of pollution liberation. The present article has the objective of emphasizing the effective steps for the economy of energy in boilers, such as, the regulation of combustion; the control of soot and incrustations; the installation of economizers, air heaters and super heaters; the reduction in purges and reintroduction of condensed steam. (author)

  20. Wood-Fired Boiler System Evaluation at Fort Stewart, GA

    National Research Council Canada - National Science Library

    Potts, Noel

    2002-01-01

    Part of the plan to modernize the central energy plant (CEP) at Fort Stewart, GA is focused on the installations wood-fired boiler, which provides steam for heating, cooling, and domestic hot water. The U.S...

  1. Seismic model of the nuclear boiler SPX2

    International Nuclear Information System (INIS)

    Christodoulou, K.

    1982-01-01

    A model of the nuclear boiler SPX2 is proposed in this paper enabling to carry out comparative calculations on the response to seismic effects. The calculations are made in CISE and SEPTEN departments of Electricite de France [fr

  2. High gradient magnetic filters for boiler water treatment

    International Nuclear Information System (INIS)

    Harland, J.R.; Nichols, R.M.

    1977-01-01

    Heavy metal oxide suspended solids in those steam condensates recycled to the boilers produce buildup within the boiler tubes which can lead to unequal and reduced heat transfer efficiency, and indirectly, to boiler tube failures. Recommended reductions in such suspended solids in feedwater to the economizers of modern high pressure boilers to levels of under 10 ppb have been published. The industrially-available SALA-HGMF magnetic filter has achieved these desired suspended solids levels in treating steam condensates. The high gradient magnetic filter has been shown in pilot tests to achieve and even exceed the recommended low level suspended solids in a practical and efficient industrial system. Such electromagnetic filters, when combined with good system chemistry, have achieved low single number parts per billion levels of several heavy metals with very high single-pass efficiencies

  3. Química recreativa con agua oxigenada

    Directory of Open Access Journals (Sweden)

    Mª Luisa Aguilar Muñoz

    2011-01-01

    Full Text Available Con el objeto de despertar el interés por la química así como de tratar diversos conceptos químicos y biológicos, presentamos la reacción de descomposición catalítica del agua oxigenada (H2O2 en tres experiencias diferentes y con distintos catalizadores. Esta reacción es muy exotérmica, produciendo agua y oxígeno. En la primera experiencia, se mezclan en una probeta la disolución de agua oxigenada y un poco de lavavajillas. Al añadir yoduro de potasio, éste actúa como catalizador y aparece gran cantidad de espuma debido al oxígeno desprendido en la reacción. En la segunda, se utiliza como catalizador un óxido de manganeso finamente dividido, que al dejarlo caer en el recipiente que contiene agua oxigenada, produce un espectacular chorro de vapor de agua. En la última, se produce una llamativa reacción luminiscente entre el peróxido de hidrógeno y el luminol utilizando como catalizador el ión hierro contenido en el hexacianoferrato (III de potasio (ferricianuro de potasio.

  4. Installations of SNCR on bark-fired boilers

    International Nuclear Information System (INIS)

    Hjalmarsson, A.K.; Hedin, K.; Andersson, Lars

    1997-01-01

    Experience has been collected from the twelve bark-fired boilers in Sweden with selective non catalytic reduction (SNCR) installations to reduce emissions of nitrogen oxides. Most of the boilers have slope grates, but there are also two boilers with cyclone ovens and two fluidized bed boilers. In addition to oil there are also possibilities to burn other fuel types in most boilers, such as sludge from different parts of the pulp and paper mills, saw dust and wood chips. The SNCR installations seems in general to be of simple design. In most installations the injection nozzles are located in existing holes in the boiler walls. The availability is reported to be good from several of the SNCR installations. There has been tube leakage in several boilers. The urea system has resulted in corrosion and in clogging of one oil burner. This incident has resulted in a decision not to use SNCR system with the present design of the system. The fuel has also caused operational problems with the SNCR system in several of the installations due to variations in the moisture content and often high moisture content in bark and sludge, causing temperature variations. The availability is presented to be high for the SNCR system at several of the plants, in two of them about 90 %. The results in NO x reduction vary between the installations depending on boiler, fuel and operation. The emissions are between 45 and 100 mg NO 2 /MJ fuel input and the NO x reduction rates are in most installations between 30 and 40 %, the lowest 20 and the highest 70 %. 13 figs, 3 tabs

  5. [Emission characteristics of fine particles from grate firing boilers].

    Science.gov (United States)

    Wang, Shu-Xiao; Zhao, Xiu-Juan; Li, Xing-Hua; Wei, Wei; Hao, Ji-Ming

    2009-04-15

    Grate firing boilers are the main type of Chinese industrial boilers, which accounts for 85% of the industrial boilers and is one of the most important emission sources of primary air pollutants in China. In this study, five boilers in three cities were selected and tested to measure the emission characteristics of PM2.5, and gaseous pollutants were applied by a compact dilution sampling system, which was developed for this field study. Results showed that particles mass size distributions for the five industrial boilers presented single peak or double peak, former peaks near 0.14 microm and the later peaks after 1.0 microm; the cyclone dust remover and wet scrubber dust remover had effective removal efficiencies not only to PM2.5, but also to PM1.0; and under the condition of same control techniques, grate firing boiler with high capacity has less PM2.5 emission than the boiler with low capacity. In the PM2.5 collected from flue gases, SO4(2-) was the most abundant ion, accounted for 20%-40% of the PM2.5; and C was the most abundant element (7.5%-31.8%), followed by S (8.4%-18.7%). Carbon balance method was applied to calculate the emission factors of these pollutants. The emission factors of PM2.5, NO, and SO2 were in the range of 0.046-0.486 g x kg(-1), 1.63-2.47 g x kg(-1), 1.35-9.95 g x kg(-1) respectively. The results are useful for the emission inventory development of industrial boilers and the source analysis of PM2.5 in atmospheric environment.

  6. AUTOMATIC CONTROL SYSTEM OF THE DRUM BOILER SUPERHEATED STEAM TEMPERATURE.

    Directory of Open Access Journals (Sweden)

    Juravliov A.A.

    2006-04-01

    Full Text Available The control system of the temperature of the superheated steam of the drum boiler is examined. Main features of the system are the PI-controller in the external control loop and introduction of the functional component of the error signal of the external control loop with the negative feedback of the error signal between the prescribed value of steam flowrate and the signal of the steam flowrate in the exit of the boiler in the internal control loop.

  7. Brief introduction of GEF efficient industrial boiler project in China

    Energy Technology Data Exchange (ETDEWEB)

    Meijian, T.

    1996-12-31

    The present situation of installed industrial boilers, their efficiency and environmental impact are assessed. And the factors contribute to the low efficiency and serious pollution are summarized. Based on WB-assisted GEF project, {open_quotes}Efficient Industrial Boiler Project{close_quotes} aimed at CO{sub 2} mitigation in China, a series of effective measures to bring the GHG emission under control are addressed, in technology, system performance, and operation management aspects.

  8. The ASME Boiler and Pressure Vessel Code: overview

    International Nuclear Information System (INIS)

    Farr, J.R.

    1987-01-01

    To become familiar with the Boiler and Pressure Vessel Code of the American Society of Mechanical Engineers, it is necessary to understand the history, organization, and operation of the Boiler Code Committee as well as to become familiar with the important aspects of each Section of the Code. This chapter will review the background and contents of the Code as well as give a review of the salient contents of most sections. (author)

  9. Electric boilers for nuclear power plant in Liebstadt

    International Nuclear Information System (INIS)

    Anon.

    1977-01-01

    A type of electric boiler, two of which are to be supplied to the Liebstadt nuclear power plant by Sulzer, is described. They are to be used for start-up and as reserve for the normal steam supply. The mode of operation is that feed water is sprayed into a high tension electrode such that the falling water conducts the current to the earthed electrode. This type of boiler presents advantages in space requrements and enviromental factors. (JIW)

  10. Electric boilers for nuclear power plant in Liebstadt

    Energy Technology Data Exchange (ETDEWEB)

    1977-11-29

    A type of electric boiler, two of which are to be supplied to the Liebstadt nuclear power plant by Sulzer, is described. They are to be used for start-up and as reserve for the normal steam supply. The mode of operation is that feedwater is sprayed into a high tension electrode such that the falling water conducts the current to the earthed electrode. This type of boiler presents advantages in space requrements and enviromental factors.

  11. Numerical modelling of a straw-fired grate boiler

    DEFF Research Database (Denmark)

    Kær, Søren Knudsen

    2004-01-01

    The paper presents a computational fluid dynamics (CFD) analysis of a 33 MW straw-fired grate boiler. Combustion on the grate plays akey-role in the analysis of these boilers and in this work a stand-alone code was used to provide inlet conditions for the CFD analysis. Modelpredictions were compa...... mixing in the furnace is a key issue leading to these problems. q 2003 Elsevier Ltd. All rights reserved....

  12. Fracture analysis of tube boiler for physical explosion accident.

    Science.gov (United States)

    Kim, Eui Soo

    2017-09-01

    Material and failure analysis techniques are key tools for determining causation in case of explosive and bursting accident result from material and process defect of product in the field of forensic science. The boiler rupture generated by defect of the welding division, corrosion, overheating and degradation of the material have devastating power. If weak division of boiler burner is fractured by internal pressure, saturated vapor and water is vaporized suddenly. At that time, volume of the saturated vapor and water increases up to thousands of volume. This failure of boiler burner can lead to a fatal disaster. In order to prevent an explosion and of the boiler, it is critical to introduce a systematic investigation and prevention measures in advance. In this research, the cause of boiler failure is investigated through forensic engineering method. Specifically, the failure mechanism will be identified by fractography using scanning electron microscopes (SEM) and Optical Microscopes (OM) and mechanical characterizations. This paper presents a failure analysis of household welding joints for the water tank of a household boiler burner. Visual inspection was performed to find out the characteristics of the fracture of the as-received material. Also, the micro-structural changes such as grain growth and carbide coarsening were examined by optical microscope. Detailed studies of fracture surfaces were made to find out the crack propagation on the weld joint of a boiler burner. It was concluded that the rupture may be caused by overheating induced by insufficient water on the boiler, and it could be accelerated by the metal temperature increase. Copyright © 2017 Elsevier B.V. All rights reserved.

  13. ANALISA KEHILANGAN ENERGI PADA FIRE TUBE BOILER KAPASITAS 10 TON

    Directory of Open Access Journals (Sweden)

    Aditio Primayudi Aji Nugroho

    2015-06-01

    Full Text Available Tujuan dari penulisan ini adalah menghitung kinerja boiler dengan mengetahui kerugian energi pada saat produksi steam. Analisa teknis pada boiler sangat diperlukan, sebagai upaya peningkatan efisiensi dan mengetahui banyaknya energi yang terbuang sebagai kerugian. Faktorfaktor penyebab kehilangan panas/heat loss terbesar pada boiler antara lain : “kehilangan panas akibat gas buang kering, kandungan steam dalam gas buang, kandungan air dalam bahan bakar, kandungan air dalam suplai udara dan lain-lain”.Kehilangan panas/heat loss atau juga bisa disebut kehilangan energi merupakan salah satu faktor penting yang sangat berpengaruh dalam mengidentifikasi efisiensi pada boiler.Untuk itu dilakukan studi analisa dengan perhitungan kehilangan panas dengan tujuan untuk mengetahui besarnya penurunan performance dan penyebab dari penurunan performance. Berdasarkan data dan analisa metode direct diketahui penurunan sebesar 21% pada kondisi normal (operasi 79% dan dari hasil perhitungan kehilangan panas indirect sebesar 16.68% efisiensi boiler sebesar 83.32% maka dari itu adanya kehilangan panas, perlu adanya perbaikan dalam control pengaturan bahan bakar dan udara yang masuk secara optimum dengan cara menggunakan Oxygen Trim Control yang berfungsi untuk mengukur konsentrasi oksigen pada cerobong dan secara otomatis mengatur oksigen pada udara yang masuk burner sehingga dihasilkan pembakaran dengan efisiensi yang optimal.dan dengan menggunakan economizer pada pemanasan awal suhu air umpan dapat menaikan efisiensi boiler.

  14. Hybrid Intelligent Warning System for Boiler tube Leak Trips

    Directory of Open Access Journals (Sweden)

    Singh Deshvin

    2017-01-01

    Full Text Available Repeated boiler tube leak trips in coal fired power plants can increase operating cost significantly. An early detection and diagnosis of boiler trips is essential for continuous safe operations in the plant. In this study two artificial intelligent monitoring systems specialized in boiler tube leak trips have been proposed. The first intelligent warning system (IWS-1 represents the use of pure artificial neural network system whereas the second intelligent warning system (IWS-2 represents merging of genetic algorithms and artificial neural networks as a hybrid intelligent system. The Extreme Learning Machine (ELM methodology was also adopted in IWS-1 and compared with traditional training algorithms. Genetic algorithm (GA was adopted in IWS-2 to optimize the ANN topology and the boiler parameters. An integrated data preparation framework was established for 3 real cases of boiler tube leak trip based on a thermal power plant in Malaysia. Both the IWSs were developed using MATLAB coding for training and validation. The hybrid IWS-2 performed better than IWS-1.The developed system was validated to be able to predict trips before the plant monitoring system. The proposed artificial intelligent system could be adopted as a reliable monitoring system of the thermal power plant boilers.

  15. Feasibility of recovery boiler in paper and pulp industry

    International Nuclear Information System (INIS)

    Rashid, H.

    2010-01-01

    in this paper feasibility of recovery boiler in terms of economics and environmental impacts in studied. Recovery boilers are employed in the pulp and paper industry where the cooking agent is recovered by burning black liquor. Cooking agent is exhausted due to the absorption of lignin (a burnable component) in cooking agent in the process of straw cooking. The process of recovery boiler is to remove lignin by combustion from black liquor, and heat is produced during the combustion of lignin which is used to produce steam. Recovery boiler is economical as it is recovering valuable chemicals and steam is produced as a byproduct. Steam from recovery boiler is also used for concentrating weak black liquor to concentrated black liquor recovering 50% of the utility water being used at the plant. The regenerated water in the form of foul condensate is reused in the process. The recovery of hazardous chemicals also reduces load of environmental pollution. Which otherwise can pollute the water reservoirs, and regeneration of water makes it environmentally friendly plant. Construction and challenges in operation of recovery boiler such as smelt-water explosion are also discussed in this paper. (author)

  16. On the design of residential condensing gas boilers

    Energy Technology Data Exchange (ETDEWEB)

    Naeslund, M.

    1997-02-01

    Two main topics are dealt with in this thesis. Firstly, the performance of condensing boilers with finned tube heat exchangers and premix burners is evaluated. Secondly, ways of avoiding condensate formation in the flue system are evaluated. In the first investigation, a transient heat transfer approach is used to predict performance of different boiler configurations connected to different heating systems. The smallest efficiency difference between heat loads and heating systems is obtained when the heat exchanger gives a small temperature difference between flue gases and return water, the heat transfer coefficient is low and the thermostat hysteresis is large. Taking into account heat exchanger size, the best boiler is one with higher heat transfer per unit area which only causes a small efficiency loss. The total heating cost at part load, including gas and electricity, has a maximum at the lowest simulated heat load. The heat supplied by the circulation heat pump is responsible for this. The second investigation evaluates methods of drying the flue gases. Reheating the flue gases in different ways and water removal in an adsorbent bed are evaluated. Reheating is tested in two specially designed boilers. The necessary reheating is calculated to approximately 100-150 deg C if an uninsulated masonry chimney is used. The tested boilers show that it is possible to design a proper boiler. The losses, stand-by and convective/radiative, must be kept at a minimum in order to obtain a high efficiency. 86 refs, 70 figs, 16 tabs

  17. Failure analysis of boiler tubes in lakhra coal power plant

    International Nuclear Information System (INIS)

    Shah, A.; Baluch, M.M.; Ali, A.

    2010-01-01

    Present work deals with the failure analysis of a boiler tube in Lakhra fluidized bed combustion power station. Initially, visual inspection technique was adopted to analyse the fractured surface. Detailed microstructural investigations of the busted boiler tube were carried out using light optical microscope and scanning electron microscope. The hardness tests were also performed. A 50 percent decrease in hardness of intact portion of the tube material and from area adjacent to failure was measured, which was found to be in good agreement with the wall thicknesses measured of the busted boiler tube i.e. 4 mm and 2 mm from unaffected portion and ruptured area respectively. It was concluded that the major cause of failure of boiler tube is erosion of material which occurs due the coal particles strike at the surface of the tube material. Since the temperature of boiler is not maintained uniformly. The variations in boiler temperature can also affect the material and could be another reason for the failure of the tube. (author)

  18. 46 CFR 52.01-2 - Adoption of section I of the ASME Boiler and Pressure Vessel Code.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Adoption of section I of the ASME Boiler and Pressure...) MARINE ENGINEERING POWER BOILERS General Requirements § 52.01-2 Adoption of section I of the ASME Boiler and Pressure Vessel Code. (a) Main power boilers and auxiliary boilers shall be designed, constructed...

  19. Sustancias húmicas en aguas para abastecimiento

    Directory of Open Access Journals (Sweden)

    Miller Camargo Valero

    1999-09-01

    Full Text Available Las sustancias húmicas hacen parte de los productos de degradación de la materia orgánica del suelo y se incorporan a las aguas superficiales por la acción de lavado que realizan las aguas de escorrentía. Estas sustancias han sido reconocidas como precursores en la formación de subproductos de la desinfección con cloro libre en plantas de tratamiento de agua potable. Los subproductos de desinfección, compuestos orgánicos halogenados, se han catalogado como sustancias potencialmente cancerígenas en humanos, y por tanto el interés en conocer más sobre las sustancias precursoras, mecanismos de formación de subproductos de desinfección, situación nacional y métodos para disminuir su formación.

  20. Figuras, usos y valores del agua en Bogotá

    Directory of Open Access Journals (Sweden)

    José Manuel Jaramillo Giraldo

    2003-01-01

    Full Text Available El uso del agua representa un factor central del proceso de urbanización de las sociedades. Involucra limitaciones a las nociones dominantes de orden, limpieza, higiene, y organización que operan sobre el espacio, el comportamiento individual, las prácticas sociales y la valoración que construimos sobre estos. En ciudades como Bogotá, cuyo crecimiento urbano espontáneo alcanzó casi a la mitad del total de viviendas levantadas durante la segunda mitad del siglo XX, el agua, como las redes clandestinas de servicios, reflejan as Bogota, una forma de apropiación e integración al espacio social, que revela el conflicto entre la ciudad formal o establecida y la ciudad marginal. Palabras clave: Urbanización v abastecimiento services, reflecrs a wav of appropnation and de agua

  1. Defensa del agua desde la participación comunitaria

    Directory of Open Access Journals (Sweden)

    Martha Muñoz

    2013-09-01

    Full Text Available Las organizaciones comunitarias en Colombia defienden el mantenimiento de los páramos, indispensables para la provisión de agua en zonas rurales y urbanas. Se oponen a la idea del desarrollo económico que concibe al agua como servicio ambiental, vulnerando un derecho fundamental. Un ejemplo de organización es la que se lleva a cabo en el Santuario de Flora y Fauna de Iguaque. Ahí, los veedores saben que si no luchan por el agua perderán un derecho, como sucedió en las veredas de Olivos Alto y Bajo del municipio de Sanjuan de Rioseco, donde el Estado impuso sus políticas.

  2. El agua en América Latina

    Directory of Open Access Journals (Sweden)

    Ángel Wilfrido Yánez-Yánez

    2016-11-01

    Full Text Available El uso racional del agua en la actualidad constituye en uno de los mayores retos de la humanidad. En este sentido, el agua en América Latina llega a ser uno de los recursos esenciales para toda forma de vida. Según cálculos del Programa Ambiental de Naciones Unidas, la región cuenta con el 65% de agua dulce del mundo. Sin embargo, la relación entre la oferta y demanda de agua da lugar a situaciones muy complejas y distintas, dependiendo de cada país. La frecuente escasez del agua en la Región Andina, ocasionada por el cambio climático, las sequías prolongadas y, el aumento constante de la población humana, ocasionan, conflictos entre regiones, por el control y uso del agua. Por otra parte el 97.5 % del agua existente en el planeta es salada, mientras que un 2.5 % del recurso hídrico es apto para el consumo de los seres humanos y para el desarrollo de las actividades agropecuarias, sugiriendo el mejor aprovechamiento, para reducir los conflictos sociales derivados de los monopolios que controlan el recurso hídrico. Este hecho tendrá repercusiones económicas y geopolíticas en todo el mundo, aunque en América se verá involucrada por el contraste manifiesto que existe entre la zona septentrional, cada vez más sedienta y esquilmada de sus recursos hídricos, y el área meridional, donde el agua es abundante y todavía no ha sido debidamente aprovechada. En cualquier caso, se puede hablar con absoluta propiedad de la existencia de una disputa del agua entre el centro y la periferia, entre grupos antagónicos con intereses contrapuestos donde una vez más se generan desequilibrios y exclusiones socioeconómicas, culturales, políticas y ambientales. Se establece de hecho una pugna entre quienes piensan que el agua debe ser considerada un bien comercial y quienes sostienen que se trata de un bien social relacionado con el derecho a la vida. Ante ésta realidad se hace indispensable seguir trabajando en la conservación de los p

  3. DBSSP - A computer program for simulation of controlled circulation boiler and natural circulation boiler start up behavior

    International Nuclear Information System (INIS)

    Li Bin; Chen Tingkuan; Yang Dong

    2005-01-01

    In this paper, a computer program, Drum Boiler Start-up Simulation Program (DBSSP), is developed for simulating the start up behavior of controlled circulation and natural circulation boilers. The mathematical model developed here is based on the first principles of mass, energy and momentum conservations. In the boiler model, heat transfer in the waterwall, the superheater, the reheater and the economizer is simulated by the distributing parameter method, while heat transfer in the drum and the downcomer is simulated by lumped parameter analysis. The program can provide detailed flow and thermodynamic characteristics of the boiler components. The development of this program is based only on design data, so it can be used for any subcritical, controlled or natural circulation boiler. The simulation results were compared with experimental measurements, and good agreements between them were found. This program is expected to be useful for predicting the characteristics and the performance of controlled circulation and natural circulation boilers during the start up process. It also can be used to optimize a start up system for minimum start up time

  4. Organización comunitaria y sustentabilidad del agua

    OpenAIRE

    Sandoval Moreno, Adriana; Universidad Nacional Autonoma de Mexico

    2015-01-01

    Mediante el método cualitativo se analiza cómo las organizaciones comunitarias para el riego y para el consumo humano del agua hacen frente a la problemática de la sustentabilidad de este recurso en la región Lerma-Chapala de Michoacán, México. Los resultados muestran, por un lado, que las organizaciones se basan en arreglos consuetudinarios, buscan la distribución equitativa del agua y tienen una función de control sobre esta en forma de autogestión, con recursos propios, capacidades, sabere...

  5. Tratamiento de aguas residuales textiles mediante un biorreactor de membrana

    OpenAIRE

    Lorena Salazar Gámez; Martí Crespi Rosell; Roberto Salazar

    2009-01-01

    En la actualidad, los investigadores dedicados al tratamiento de agua residual se han esforzado por obtener mejores rendimientos de depuración, reducción de costos de operación y mantenimiento en la generación de procesos que posean una elevada flexibilidad para soportar las variaciones en el afluente, que generen una mínima producción de lodos y que sean diseñados en condiciones mínimas de área. En este trabajo se expone una nueva tecnología en el tratamiento de agua residual, la de los Bior...

  6. La ley de aguas y el principio de celeridad

    OpenAIRE

    Hidalgo Pulía, Ana María; Moyón Altamirano, Paola Alexandra

    2012-01-01

    La presente tesis intitulada “La Ley de Aguas y el Principio de celeridad” se realiza como requisito previo a la obtención del título de Magíster en Derecho Civil y Procesal Civil, se desarrolla en cuatro capítulos, cuyo contenido se detalla a continuación. En el Capítulo I, se aborda el problema que da lugar a esta investigación, esto es, la inaplicabilidad del principio de celeridad en los procesos de agua. El objetivo general proponer un anteproyecto de ley reformatorio a la Ley de A...

  7. El estado actual de los ambientes del agua

    OpenAIRE

    Mateu Bellés, Joan F.; Camarasa Belmonte, Ana María

    2008-01-01

    Los ambientes del agua –recursos singulares por sus funciones en la naturaleza y por sus prestaciones y connotaciones para los grupos humanos- son un valioso patrimonio. En concreto, los lagos, los ríos y las masas marinas y subterráneas constituyen bienes territoriales que aportan diversidad ecológica, estructuran paisajes y, a menudo, son utilizados por los humanos para el desarrollo de sus actividades (Martín Montalvo, 1996). A lo largo del tiempo, los ambientes del agua no son estables e...

  8. Inventario y evaluación nacional de aguas superficiales

    OpenAIRE

    Oficina Nacional de Evaluación de Recursos Naturales

    1980-01-01

    Determina la potencialidad del recurso agua de escurrimiento superficial a nivel medio anual y su distribución en el territorio peruano. El informe incluye el Inventario y Evaluación Nacional de Aguas Superficiales, propiamente dicho y el Inventario Nacional de Ríos y se acompaña con el Mapa de Zonas de Escurrimiento del Perú y la propuesta para un Programa de Instalaciones Hidrométricas. Para el desarrollo de esta publicación se ha considerado las complejidades propias del territorio desde l...

  9. Orion Boiler Plate Airdrop Test System

    Science.gov (United States)

    Machin, Ricardo A.; Evans, Carol T.

    2013-01-01

    On the 29th of February 2012 the Orion Capsule Parachute Assembly System (CPAS) project attempted to perform an airdrop test of a boilerplate test article for the second time. The first attempt (Cluster Development Test 2, July 2008) to deliver a similar boilerplate from a C-17 using the Low Velocity Air Drop (LVAD) technique resulted in the programmer parachute failing to properly inflate, the test article failing to achieve the desired test initiation conditions, and the test article a total loss. This paper will pick up where the CDT-2 failure investigation left off, describing the test technique that was adopted, and outline the modeling that was performed to gain confidence that the second attempt would be successful. The second boiler plate test (Cluster Development Test 3-3) was indeed a complete success and has subsequently been repeated several times, allowing the CPAS project to proceed with the full scale system level development testing required to integrate the hardware to the first Entry Flight Test vehicle as well as go into the Critical Design Review with minimum risk and a mature design.

  10. Computations of NOx emissions of domestic boilers

    Energy Technology Data Exchange (ETDEWEB)

    Thevenin, D. [Ecole Centrale de Paris, 92 - Chatenay-Malabry (France). EM2C Lab.; Gicquel, O.; Darabiha, N.

    2001-07-01

    Due to severe regulations concerning pollutant emissions, practical devices using combustion to release energy must be designed from the start using accurate, predictive numerical tools. A partially premixed methane/air flame in a two-dimensional configuration is investigated in this work. This configuration is close to those used in real domestic gas boilers. The flame structure and flow pattern are calculated using complex chemistry and detailed transport models. A post-processing method is then used to predict NO emission. Computations are performed for two configurations. The two cases have the same primary and secondary mass flow-rates and equivalence ratio. The only difference between them is the introduction of an insert inside the primary injector. Both results have been compared to measurements. Calculations are found to be in good agreement with the flame shapes observed experimentally. The classical burner shows a Bunsen-type flame while the one with an insert has a totally different shape (butterfly-type flame). NO emission levels are also well predicted in both configurations. The butterfly flame induces a reduction in NO emission. This reduction seems to be due to the increased mixing between the burnt gases and the secondary air jet, which homogenizes the temperature distribution and reduces the maximum temperature. (orig.)

  11. Reuso de aguas residuales domésticas en agricultura. una revisión

    OpenAIRE

    Silva, Jorge; Torres, Patricia; Madera, Carlos

    2010-01-01

    Las aguas residuales son una importante fuente adicional para satisfacer la demanda del recurso, a causa de la disponibilidad limitada de agua potable para cubrir los requerimientos de las poblaciones, los bajos costos, los beneficios para los suelos agrícolas y la disminución del impacto sobre el ambiente. Sin embargo, el predominio del uso de aguas residuales crudas o diluidas con aguas superficiales y el bajo porcentaje de aguas residuales tratadas en Colombia y en...

  12. Desalinización de aguas salobres mediante el uso de flujos capilares

    OpenAIRE

    García Murillo, Alfonso

    2015-01-01

    El agua dulce del planeta es del 3%, es cual es obtenido principalmente por evaporación solar del agua salada de los océanos, de la precipitación del agua evaporada por condensación se forman los glaciares, ríos, lagos, El agua dulce es empleada por el ser humano en los diferentes procesos industriales y alimenticios, después de su uso resulta por lo general contaminada por lo que es necesario realizar tratamientos para su limpieza. En la actualidad se obtiene una cantidad infima de agua dul...

  13. Model-free adaptive control of supercritical circulating fluidized-bed boilers

    Science.gov (United States)

    Cheng, George Shu-Xing; Mulkey, Steven L

    2014-12-16

    A novel 3-Input-3-Output (3.times.3) Fuel-Air Ratio Model-Free Adaptive (MFA) controller is introduced, which can effectively control key process variables including Bed Temperature, Excess O2, and Furnace Negative Pressure of combustion processes of advanced boilers. A novel 7-input-7-output (7.times.7) MFA control system is also described for controlling a combined 3-Input-3-Output (3.times.3) process of Boiler-Turbine-Generator (BTG) units and a 5.times.5 CFB combustion process of advanced boilers. Those boilers include Circulating Fluidized-Bed (CFB) Boilers and Once-Through Supercritical Circulating Fluidized-Bed (OTSC CFB) Boilers.

  14. Steam generators and waste heat boilers for process and plant engineers

    CERN Document Server

    Ganapathy, V

    2014-01-01

    Incorporates Worked-Out Real-World ProblemsSteam Generators and Waste Heat Boilers: For Process and Plant Engineers focuses on the thermal design and performance aspects of steam generators, HRSGs and fire tube, water tube waste heat boilers including air heaters, and condensing economizers. Over 120 real-life problems are fully worked out which will help plant engineers in evaluating new boilers or making modifications to existing boiler components without assistance from boiler suppliers. The book examines recent trends and developments in boiler design and technology and presents novel idea

  15. Eliminación del arsénico en diferentes clases de aguas con zeolitas naturales

    OpenAIRE

    Lazo Camposano, Roberto

    2013-01-01

    Para el desarrollo del presente trabajo de Investigación se ha tenido Ia referencia sobre todo de las contaminaciones de las diferentes aguas sea este de origen natural, aguas subterráneas, aguas de rio, aguas procedentes de Iluvias, aguas de filtraciones, aguas de minas, etc, es decir toda clase de agua que contenga el arsénico que es perjudicial a la salud humana. En el presente trabajo se utilizará un medio adsorbente que consiste de zeolita natural (clinoptilolita) recubierta con óxido...

  16. Performance of a pellet boiler fired with agricultural fuels

    International Nuclear Information System (INIS)

    Carvalho, Lara; Wopienka, Elisabeth; Pointner, Christian; Lundgren, Joakim; Verma, Vijay Kumar; Haslinger, Walter; Schmidl, Christoph

    2013-01-01

    Highlights: ► Performance evaluation of a pellet boiler operated with different agricultural fuels. ► Agricultural fuels could be burn in the tested boiler for a certain period of time. ► All the fuels (except straw and Sorghum) satisfied the European legal requirements. ► Boilers for burning agricultural fuels should have a flexible control system. - Abstract: The increasing demand for woody biomass increases the price of this limited resource, motivating the growing interest in using woody materials of lower quality as well as non-woody biomass fuels for heat production in Europe. The challenges in using non-woody biomass as fuels are related to the variability of the chemical composition and in certain fuel properties that may induce problems during combustion. The objective of this work has been to evaluate the technical and environmental performance of a 15 kW pellet boiler when operated with different pelletized biomass fuels, namely straw (Triticum aestivum), Miscanthus (Miscanthus × giganteus), maize (Zea mays), wheat bran, vineyard pruning (from Vitis vinifera), hay, Sorghum (Sorghum bicolor) and wood (from Picea abies) with 5% rye flour. The gaseous and dust emissions as well as the boiler efficiency were investigated and compared with the legal requirements defined in the FprEN 303-5 (final draft of the European standard 303-5). It was found that the boiler control should be improved to better adapt the combustion conditions to the different properties of the agricultural fuels. Additionally, there is a need for a frequent cleaning of the heat exchangers in boilers operated with agricultural fuels to avoid efficiency drops after short term operation. All the agricultural fuels satisfied the legal requirements defined in the FprEN 303-5, with the exception of dust emissions during combustion of straw and Sorghum. Miscanthus and vineyard pruning were the best fuels tested showing comparable emission values to wood combustion

  17. Ultra-Supercritical Pressure CFB Boiler Conceptual Design Study

    Energy Technology Data Exchange (ETDEWEB)

    Zhen Fan; Steve Goidich; Archie Robertson; Song Wu

    2006-06-30

    Electric utility interest in supercritical pressure steam cycles has revived in the United States after waning in the 1980s. Since supercritical cycles yield higher plant efficiencies than subcritical plants along with a proportional reduction in traditional stack gas pollutants and CO{sub 2} release rates, the interest is to pursue even more advanced steam conditions. The advantages of supercritical (SC) and ultra supercritical (USC) pressure steam conditions have been demonstrated in the high gas temperature, high heat flux environment of large pulverized coal-fired (PC) boilers. Interest in circulating fluidized bed (CFB) combustion, as an alternative to PC combustion, has been steadily increasing. Although CFB boilers as large as 300 MWe are now in operation, they are drum type, subcritical pressure units. With their sizes being much smaller than and their combustion temperatures much lower than those of PC boilers (300 MWe versus 1,000 MWe and 1600 F versus 3500 F), a conceptual design study was conducted herein to investigate the technical feasibility and economics of USC CFB boilers. The conceptual study was conducted at 400 MWe and 800 MWe nominal plant sizes with high sulfur Illinois No. 6 coal used as the fuel. The USC CFB plants had higher heating value efficiencies of 40.6 and 41.3 percent respectively and their CFB boilers, which reflect conventional design practices, can be built without the need for an R&D effort. Assuming construction at a generic Ohio River Valley site with union labor, total plant costs in January 2006 dollars were estimated to be $1,551/kW and $1,244/kW with costs of electricity of $52.21/MWhr and $44.08/MWhr, respectively. Based on the above, this study has shown that large USC CFB boilers are feasible and that they can operate with performance and costs that are competitive with comparable USC PC boilers.

  18. Identification of boiler tube leak in PHWR by measuring short lived radioisotope Iodine-134 in boiler water using gamma spectrometric techniques

    International Nuclear Information System (INIS)

    Pal, P.K.; Bohra, R.C.

    2015-01-01

    The boiler tube made up of Monel-400 of RAPS-2 has failed on few occasions. Due to the failure of boiler tube, the active heavy water enters into boiler and feed water leading to contamination of radioactivity in secondary water circuit. The identification of boiler tube failure was done by measuring gamma ray activity of Iodine-134 in the boiler water with sample using gamma spectrometry with high purity germanium detector. In order to increase the sensitivity of the method 5 liters of Boiler water sample was passed through a plastic column containing 40 ml of anion resin and 10 ml of activated charcoal to capture the isotopes of Iodine in the anionic form and molecular form. Samples were collected from all 8 Boilers of RAPS-2. The activity of 134 I was shown only by Boiler - 5. No other boilers showed any activity of 134 I. This indicated that Boiler - 5 had leaky tubes. The leaky hairpin of boiler - 5 was identified by measuring Tritium and IP in the riser and down comer of all 10 HXs. On the basis of Tritium and IP result, HX-7 was identified as leaky hairpin. (author)

  19. Process for start-up and slack period operation of fully charged boilers, e. g. of coal pressure gasification plants, and boiler system to carry out the process

    Energy Technology Data Exchange (ETDEWEB)

    Meyer-Kahrweg, H

    1978-10-19

    For the start-up and slack period of fully charged boilers hot water of e.g. 180/sup 0/C from a high pressure heater which is fed by a start-up boiler is used. In the first instance the boiler, its preheater and the vaporizer are filled with hot water from the start-up boiler until a medium water level is obtained. Subsequently water from the water separator is recycled through the preheater and the boiler by forced circulation and it is heated up to the hot water temperature by the start-up boiler. After the desired temperature has been reached the pressure combustion is ignited and the circulation through the preheater is interrupted by reversing to direct feed back. A considerable shortening of the start-up time is achieved because no heat is released to the condensation water in the boiler system as is done usually.

  20. A statistical estimator for the boiler power and its related parameters

    International Nuclear Information System (INIS)

    Tang, H.

    2001-01-01

    To determine the boiler power accurately is important for both controlling the plant and maximizing the plant productivity. There are two computed boiler powers for each boiler. They are steam based boiler power and feedwater based boiler power. The steam based boiler power is computed as the enthalpy difference between the feedwater enthalpy and the boiler steam enthalpy. The feedwater based boiler power is computed as enthalpy absorbed by the feedwater. The steam based boiler power is computed in RRS program and used in calibrating the measured reactor power, while the feedwater based boiler power is computed in CSTAT program and used for indication. Since the steam based boiler power is used as feedback in the reactor control, it is chosen to be the one estimated in this work. Because the boiler power employs steam flow, feedwater flow and feedwater temperature measurements, and because any measurement contains constant or drifting noise and bias, the reconciliation and rectification procedures are needed to determine the boiler power more accurately. A statistic estimator is developed to perform the function of data reconciliation, gross error detection and instruments performance monitoring

  1. Analysis of a waste-heat boiler by CFD simulation

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Yongziang; Jokilaakso, A. [Helsinki Univ. of Technology, Otaniemi (Finland)

    1996-12-31

    Waste-heat boilers play important roles in the continuous operation of a smelter and in the conservation of energy. However, the fluid flow and heat transfer behaviour has not been well studied, concerning the boiler performance and design. This presentation describes simulated gas flow and heat transfer of a waste-heat boiler in the Outokumpu copper flash smelting process. The governing transport equations for the conservation of mass, momentum and enthalpy were solved with a commercial CFD-code PHOENICS. The standard k-{epsilon} turbulence model and a composite-flux radiation model were used in the computations. The computational results show that the flow is strongly recirculating and distinctly three-dimensional in most part of the boiler, particularly in the radiation section. The predicted flow pattern and temperature distribution were in a good agreement with laboratory models and industrial measurements. The results provide detailed information of flow pattern, the temperature distribution and gas cooling efficiency. The CFD proved to be a useful tool in analysing the boiler operation. (author)

  2. How much Energy is Embodied in your Central Heating Boiler?

    Science.gov (United States)

    Koubogiannis, D.; Nouhou, C.

    2016-11-01

    Life Cycle Analysis (LCA) is an important tool in current research to quantitatively assess energy consumption and environmental impact of a building. In the context of LCA, the Embodied Energy (EE) related to the building and the corresponding Embodied CO2 emissions are valuable data. In such a case, these data concern the constitutive materials of the building and any subsystem, component or equipment in it. Usually, after calculating the mass of these materials, embodied energy values are estimated multiplying them by the corresponding EE coefficients concerning the production of these materials (EEMP). However, apart from transportation energy costs, another part of EE is that consumed for the manufacturing of any item as a finished product. The present work focuses on the manufacturing EE (EEMFG) of central heating boilers in Hellenic dwellings. Six typical boilers of different types are studied. Each of them is analyzed to its constitutive materials and its EEMP is estimated. For four of them, the boiler house where it was constructed in Greece was visited and data were collected. Based on them the corresponding boiler EEMFG values are estimated. The results concerning the EE for material production and manufacturing, as well as the results concerning the corresponding ECO2 values are discussed and assessed. Benchmark values correlating EE and ECO2 with the mass or the heat rate of the boiler are extracted.

  3. Slagging in a pulverised-coal-fired boiler

    Energy Technology Data Exchange (ETDEWEB)

    Devir, G.P.; Pohl, J.H.; Creelman, R.A. [University of Queensland, St. Lucia, Qld. (Australia). Dept. of Chemical Engineering

    2000-07-01

    This paper describes a technique to evaluate the severity of slagging of a coal in a pulverised-coal-fired boiler. There are few data in the literature on the nature of in-situ boiler slags, their rate of growth and/or their strength properties relevant to sootblowing. The latter is thought to be of more concern to boiler operators and gives rise to the significance of selecting suitable strength tests. As well as standardised methods for characterising pulverised coal performance in a boiler, several novel and less popular techniques are discussed in detail. A suite of three sub-bituminous coals from the Callide Coalfields, Biloela (600 km north of Brisbane), has been selected for slagging tests in the 350 MW{sub e} units of Callide 'B' power station. Disposable air-cooled mild steel slagging probes have been constructed to simulate the conditions for deposit formation in the boiler region. To date, tests for one of these coals has been completed and preliminary results are presented. Once testing for the remaining coals has been completed, it is anticipated that the differences exhibited in deposit growth and strength may be correlated with typical variations in physical and chemical properties of the pulverised coal.

  4. Analysis of a waste-heat boiler by CFD simulation

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Yongziang; Jokilaakso, A [Helsinki Univ. of Technology, Otaniemi (Finland)

    1997-12-31

    Waste-heat boilers play important roles in the continuous operation of a smelter and in the conservation of energy. However, the fluid flow and heat transfer behaviour has not been well studied, concerning the boiler performance and design. This presentation describes simulated gas flow and heat transfer of a waste-heat boiler in the Outokumpu copper flash smelting process. The governing transport equations for the conservation of mass, momentum and enthalpy were solved with a commercial CFD-code PHOENICS. The standard k-{epsilon} turbulence model and a composite-flux radiation model were used in the computations. The computational results show that the flow is strongly recirculating and distinctly three-dimensional in most part of the boiler, particularly in the radiation section. The predicted flow pattern and temperature distribution were in a good agreement with laboratory models and industrial measurements. The results provide detailed information of flow pattern, the temperature distribution and gas cooling efficiency. The CFD proved to be a useful tool in analysing the boiler operation. (author)

  5. Studies Concerning Water-Surface Deposits in Recovery Boilers

    Energy Technology Data Exchange (ETDEWEB)

    Strandberg, O; Arvesen, J; Dahl, L

    1971-11-15

    The Feed-water Committee of the Stiftelsen Svensk Cellulosaforskning (Foundation for Swedish Cellulose Research) has initiated research and investigations which aim to increase knowledge about water-surface deposits in boiler tubes, and the resulting risks of gas-surface corrosion in chemical recovery boilers (sulphate pulp industry). The Committee has arranged with AB Atomenergi, Studsvik, for investigations into the water-surface deposits on tubes from six Scandinavian boilers. These investigations have included direct measurements of the thermal conductivity of the deposits, and determinations of their quantity, thickness and structure have been carried out. Previous investigations have shown that gas-surface corrosion can occur at tube temperatures above 330 deg C. The measured values for the thermal conductivity of the deposits indicate that even with small quantities of deposit (c. 1 g/dm2 ) and a moderate boiler pressure (40 atm), certain types of deposit can give rise to the above-mentioned surface temperature, at which the risk of gas-surface corrosion becomes appreciable. For higher boiler pressures the risk is great even with a minimal layer of deposit. The critical deposit thickness can be as low as 0.1 mm

  6. Computational Modeling and Assessment Of Nanocoatings for Ultra Supercritical Boilers

    Energy Technology Data Exchange (ETDEWEB)

    Gandy, David W. [Electric Power Research Institute, Inc., Palo Alto, CA (United States); Shingledecker, John P. [Electric Power Research Institute, Inc., Palo Alto, CA (United States)

    2011-05-11

    Coal-fired power plants are a significant part of the nation's power generating capacity, currently accounting for more than 55% of the country's total electricity production. Extending the reliable lifetimes of fossil fired boiler components and reducing the maintenance costs are essential for economic operation of power plants. Corrosion and erosion are leading causes of superheater and reheater boiler tube failures leading to unscheduled costly outages. Several types of coatings and weld overlays have been used to extend the service life of boiler tubes; however, the protection afforded by such materials was limited approximately one to eight years. Power companies are more recently focused in achieving greater plant efficiency by increasing steam temperature and pressure into the advanced-ultrasupercritical (A-USC) condition with steam temperatures approaching 760°C (1400°F) and operating pressures in excess of 35MPa (5075 psig). Unfortunately, laboratory and field testing suggests that the resultant fireside environment when operating under A-USC conditions can potentially cause significant corrosion to conventional and advanced boiler materials1-2. In order to improve reliability and availability of fossil fired A-USC boilers, it is essential to develop advanced nanostructured coatings that provide excellent corrosion and erosion resistance without adversely affecting the other properties such as toughness and thermal fatigue strength of the component material.

  7. Numerical simulation of a small-scale biomass boiler

    International Nuclear Information System (INIS)

    Collazo, J.; Porteiro, J.; Míguez, J.L.; Granada, E.; Gómez, M.A.

    2012-01-01

    Highlights: ► Simplified model for biomass combustion was developed. ► Porous zone conditions are used in the bed. ► Model is fully integrated in a commercial CFD code to simulate a small scale pellet boiler. ► Pollutant emissions are well predicted. ► Simulation provides extensive information about the behaviour of the boiler. - Abstract: This paper presents a computational fluid dynamic simulation of a domestic pellet boiler. Combustion of the solid fuel in the burner is an important issue when discussing the simulation of this type of system. A simplified method based on a thermal balance was developed in this work to introduce the effects provoked by pellet combustion in the boiler simulation. The model predictions were compared with the experimental measurements, and a good agreement was found. The results of the boiler analysis show that the position of the water tubes, the distribution of the air inlets and the air infiltrations are the key factors leading to the high emission levels present in this type of system.

  8. Investing in efficient industrial boiler systems in China and Vietnam

    International Nuclear Information System (INIS)

    Yang Ming; Dixon, Robert K.

    2012-01-01

    Energy efficiency in industrial boiler steam systems can be very low due to old technologies, improper design and non-optimal operation of the steam systems. Solutions include efficiency assessments and investments in steam system optimizations, education and training for operators of the systems. This paper presents case studies on assessing and investing in boiler steam systems in China and Vietnam. Methodologies and approaches for data collection and analyses were designed specifically for each of the two countries. This paper concludes: (1) investing in energy efficiency in industrial boiler steam system in China and Vietnam are cost effective; (2) government should not sent national energy efficiency standards lower than that of energy companies or energy equipment manufactures. - Highlights: ► GEF successfully catalyzed investment in industrial energy efficiency boilers in China in 1990s. ► With about $100 million of investment by the GEF/World Bank/Chinese government, the project will mitigate 40 million tons of CO 2 by 2019. ► This generated lowest unit cost of carbon reduction in the world: about $2.5 per ton of CO 2 mitigation. ► Investing in energy efficiency in industrial boiler steam system today in Vietnam will be the same cost effective as in China: $2.1 per ton of CO 2 mitigation.

  9. Uso Eficiente y Sustentable del agua. Implicancias y Condicionantes

    Directory of Open Access Journals (Sweden)

    Miguel Mathus Escorihuela

    2013-12-01

    Full Text Available El agua no es un recurso natural más, es un recurso vital que permite explicar integralmente los ciclos de la naturaleza y las interacciones entre las especies y el medio en que habitan en virtud del ciclo hidrológico. Pero el agua resiste al hombre, por lo que su aprovechamiento exige acciones concretas, que deben ser racionales y servir al bienestar de la sociedad, para poder alcanzar lo que hoy se llama calidad de vida en un ambiente sano. Para ello, el agua requiere de la Política Hídrica donde se determinan los fines; de la Planificación Hídrica racional y coherente que se encuentre volcada en Planes, Etapas y Programas; de la Legislación, que brinde el marco normativo, de la Administración que lleve a cabo la Política de la Gestión que es el ámbito neurálgico vinculado al uso eficiente del agua

  10. Dureza complexométrica del agua. Ejercicio 3.

    OpenAIRE

    Milla González, Miguel

    2013-01-01

    Ejercicio sencillo de aplicación del análisis complexométrico de la dureza del agua. En este ejercicio se determina el volumen de valorante AEDT necesario para valorar un volumen determinado de disolución de Mg(II). Los datos son aleatorios.

  11. Dureza complexométrica del agua. Ejercicio 2.

    OpenAIRE

    Milla González, Miguel

    2013-01-01

    Ejercicio sencillo de aplicación del análisis complexométrico de la dureza del agua. Se trata de encontrar la expresión que permite expresar la dureza de una muestra en carbonato de calcio equivalente con datos de análisis generados aleatoriamente.

  12. Dureza complexométrica del agua. Ejercicio 1.

    OpenAIRE

    Milla González, Miguel

    2013-01-01

    Se trata de un problema sencillo relacionado con la determinación complexométrica de la dureza del agua. Deberá calcularse los gramos de AEDT disódico necesarios para preparar un volumen dado del citado agente complejante de molaridad M. Los datos son aleatorios.

  13. Relojes de agua, una oportunidad para calcular integrales

    OpenAIRE

    Thiabut, Elena

    2007-01-01

    Este artículo propone una investigación sobre clepsidras (relojes de agua) para alumnos de 2º de bachillerato. El cálculo integral será la clave para descubrir cómo la geometría de los recipientes condiciona el funcionamiento de estos mecanismos milenarios.

  14. El Agua Salina y los Métodos de Riego

    Directory of Open Access Journals (Sweden)

    Bustamante Betancur Fabio

    1985-12-01

    Full Text Available La selección del método más adecuado de riego está notoriamente influenciado por las condiciones de salinidad que pueda haber en el suelo o en el agua que se usará para el riego. El objetivo principal del riego es el de abastecer el suelo con agua para que ella sea fácilmente disponible a los cultivos que en él se desarrollan o crecen. Bajo condiciones normales el método de riego que mejor se adapta, depende del cultivo, la topografía, las características del suelo y la disponibilidad del agua. Las condiciones de salinidad y sodicidad presentes en el suelo, están influenciadas por la concentración local de sales; la aplicación del riego, es una de las causas de la migración de sales y puede influenciar notoriamente el efecto salino del agua que con una determinada calidad sea aplicada.

  15. Remoción de Metales de Aguas Residuales Industriales

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Guerrero Fajardo

    2009-10-01

    Full Text Available En este trabajo se evalúa la tasa de remoción de cuatro metales pesados, comúnmente encontrado en Aguas Residuales Industriales (A,R,I,: Cobre, Cromo, Mercurio y Plata, mediante el empleo de plantas acuáticas vasculares "Jacintos de Agua". Las investigaciones para cada metal se realizaron, acondicionando aguas con cinco concentraciones diferentes que oscilaran por encima y por debajo del valor promedio encontrado en A,R,1,Se adoptó un modelo de comportamiento del sistema debido a la similitud que muestra la remoción de metales por el Jacinto de Agua, con el estudio de cultivos puros de MONOD, Esto permite realizar los ajustes estadísticos a los datosexperimentales encontrados en el presente proyecto. La ecuación establecida para el estudio de remoción de metales por un método biológico es el siguiente: % Remoción = A x t / B + t A= Porcentaje de remoción máxima B= Tiempo mínimo para alcanzar la mitad de la remoción máxima, t =Tiempo de remoción Las constantes A y B, indican la tendencia a la remoción y el tiempo mínimo de recolección, respectivamente. El Jacinto de Agua presenta limitación en su capacidad de remoción de metales, esto determina concentraciones máximas permisibles de metales en el agua para poder utilizar estas plantas acuáticas. El estudio de selectividad en la remoción de metales, indica que la presencia de Cromo, Mercurio y Plata disminuyen el porcentaje de remoción de Cobre, Se observa disminución en el porcentaje de remoción de Cromo, cuando están presentes Cobre, Mercurio y Plata en el agua residual. El caso del Mercurio es diferente a los dos anteriores, observándose más bien un efecto sinergético.

  16. New configurations of a heat recovery absorption heat pump integrated with a natural gas boiler for boiler efficiency improvement

    International Nuclear Information System (INIS)

    Qu, Ming; Abdelaziz, Omar; Yin, Hongxi

    2014-01-01

    Highlights: • Thermal and heat transfer models of absorption heat pumps driven by exhaust gas, hot water, or natural gas. • Natural gas boiler combustion model. • Heat exchanger for condensing. • Experimental data of a hot water absorption heat pump. • Economic assessment of heat recovery absorption heat pump for improving natural gas boilers. - Abstract: Conventional natural gas-fired boilers exhaust flue gas direct to the atmosphere at 150–200 °C, which, at such temperatures, contains large amount of energy and results in relatively low thermal efficiency ranging from 70% to 80%. Although condensing boilers for recovering the heat in the flue gas have been developed over the past 40 years, their present market share is still less than 25%. The major reason for this relatively slow acceptance is the limited improvement in the thermal efficiency of condensing boilers. In the condensing boiler, the temperature of the hot water return at the range of 50–60 °C, which is used to cool the flue gas, is very close to the dew point of the water vapor in the flue gas. Therefore, the latent heat, the majority of the waste heat in the flue gas, which is contained in the water vapor, cannot be recovered. This paper presents a new approach to improve boiler thermal efficiency by integrating absorption heat pumps with natural gas boilers for waste heat recovery (HRAHP). Three configurations of HRAHPs are introduced and discussed. The three configurations are modeled in detail to illustrate the significant thermal efficiency improvement they attain. Further, for conceptual proof and validation, an existing hot water-driven absorption chiller is operated as a heat pump at operating conditions similar to one of the devised configurations. An overall system performance and economic analysis are provided for decision-making and as evidence of the potential benefits. These three configurations of HRAHP provide a pathway to achieving realistic high-efficiency natural

  17. On synthesis and optimization of steam system networks. 1. Sustained boiler efficiency

    CSIR Research Space (South Africa)

    Majozi, T

    2010-08-01

    Full Text Available situations. This paper presents a process integration technique for network synthesis using conceptual and mathematical analysis without compromising boiler efficiency. It was found that the steam flow rate to the HEN could be reduced while maintaining boiler...

  18. Lagisza, world's largest CFB boiler, begins commercial operation

    Energy Technology Data Exchange (ETDEWEB)

    Nuortimo, K. [Foster Wheeler, Varkaus (Finland)

    2010-04-15

    Early operating experience with the Lagisza circulating fluidised bed (CFB) boiler in Poland - the world's largest such boiler to date, and also the first one with supercritical steam conditions - has been positive. 3 figs., 4 tabs.

  19. Evaluation of iron aluminide weld overlays for erosion - corrosion resistant boiler tube coatings in low NO{sub x} boilers

    Energy Technology Data Exchange (ETDEWEB)

    DuPont, J.N.; Banovic, S.W.; Marder, A.R. [Lehigh Univ., Bethlehem, PA (United States)

    1996-08-01

    Low NOx burners are being installed in many fossil fired power plants in order to comply with new Clean Air Regulations. Due to the operating characteristics of these burners, boiler tube sulfidation corrosion is often enhanced and premature tube failures can occur. Failures due to oxidation and solid particle erosion are also a concern. A program was initiated in early 1996 to evaluate the use of iron aluminide weld overlays for erosion/corrosion protection of boiler tubes in Low NOx boilers. Composite iron/aluminum wires will be used with the Gas Metal Arc Welding (GMAW) process to prepare overlays on boiler tubes steels with aluminum contents from 8 to 16wt%. The weldability of the composite wires will be evaluated as a function of chemical composition and welding parameters. The effect of overlay composition on corrosion (oxidation and sulfidation) and solid particle erosion will also be evaluated. The laboratory studies will be complemented by field exposures of both iron aluminide weld overlays and co-extruded tubing under actual boiler conditions.

  20. DYMEL code for prediction of dynamic stability limits in boilers

    International Nuclear Information System (INIS)

    Deam, R.T.

    1980-01-01

    Theoretical and experimental studies of Hydrodynamic Instability in boilers were undertaken to resolve the uncertainties of the existing predictive methods at the time the first Advanced Gas Cooled Reactor (AGR) plant was commissioned. The experiments were conducted on a full scale electrical simulation of an AGR boiler and revealed inadequacies in existing methods. As a result a new computer code called DYMEL was developed based on linearisation and Fourier/Laplace Transformation of the one-dimensional boiler equations in both time and space. Beside giving good agreement with local experimental data, the DYMEL code has since shown agreement with stability data from the plant, sodium heated helical tubes, a gas heated helical tube and an electrically heated U-tube. The code is now used widely within the U.K. (author)

  1. Engineering and economic aspects of centalized heating from nuclear boilers

    International Nuclear Information System (INIS)

    Emel'yanov, I.Ya.; Baturov, B.B.; Korytnikov, V.P.; Koryakin, Yu.I.; Chernyaev, V.A.; Kovylyanskij, Ya.A.; Galaktionov, I.V.

    1979-01-01

    Some engineering and economic aspects for deployment of centralized nuclear boilers (NB) in the USSR are considered. Engineering, maintenance and economic features of NB as compared to organic-fuelled boilers and nuclear thermal power plants are discussed. Among major factors governing economic efficiency of NB underlined are oraganic fuel costs, reactor unit power, location relative to heat-consuming centres and capacity factor. It is concluded that NB can be economical for heating large consumers (more than 1500 G kal/hr). At the periphery NB can be competitive already at reactor unit power of several MWth. The development of HTGR type reactor-based nuclear-chemical boilers and lines for heat transport in a chemically bound state (e.g., CH 4 → H 2 +CO 2 +CO → CH 4 ) opens the way for a substantial breakthrow in the centralized NB efficiency

  2. Optimal Combustion Conditions for a Small-scale Biomass Boiler

    Directory of Open Access Journals (Sweden)

    Viktor Plaček

    2012-01-01

    Full Text Available This paper reports on an attempt to achieve maximum efficiency and lowest possible emissions for a small-scale biomass boiler. This aim can be attained only by changing the control algorithm of the boiler, and in this way not raising the acquisition costs for the boiler. This paper describes the experimental facility, the problems that arose while establishing the facility, and how we have dealt with them. The focus is on discontinuities arising after periodic grate sweeping, and on finding the parameters of the PID control loops. Alongside these methods, which need a lambda probe signal for proper functionality, we inroduce another method, which is able to intercept the optimal combustion working point without the need to use a lambda sensor.

  3. The heat exchanger of small pellet boiler for phytomass

    Science.gov (United States)

    Mičieta, Jozef; Lenhard, Richard; Jandačka, Jozef

    2014-08-01

    Combustion of pellets from plant biomass (phytomass) causes various troubles. Main problem is slagging ash because of low melting temperature of ash from phytomass. This problem is possible to solve either improving energetic properties of phytomass by additives or modification of boiler construction. A small-scale boiler for phytomass is different in construction of heat exchanger and furnace mainly. We solve major problem - slagging ash, by decreasing combustion temperature via redesign of pellet burner and boiler body. Consequence of lower combustion temperature is also lower temperature gradient of combustion gas. It means that is necessary to design larger heat exchanging surface. We plane to use underfed burner, so we would utilize circle symmetry heat exchanger. Paper deals design of heat exchanger construction with help of CFD simulation. Our purpose is to keep uniform water flux and combustion gas flux in heat exchanger without zone of local overheating and excess cooling.

  4. COAL-FIRED UTILITY BOILERS: SOLVING ASH DEPOSITION PROBLEMS; TOPICAL

    International Nuclear Information System (INIS)

    Christopher J. Zygarlicke; Donald P. McCollor; Steven A. Benson; Jay R. Gunderson

    2001-01-01

    The accumulation of slagging and fouling ash deposits in utility boilers has been a source of aggravation for coal-fired boiler operators for over a century. Many new developments in analytical, modeling, and combustion testing methods in the past 20 years have made it possible to identify root causes of ash deposition. A concise and comprehensive guidelines document has been assembled for solving ash deposition as related to coal-fired utility boilers. While this report accurately captures the current state of knowledge in ash deposition, note that substantial research and development is under way to more completely understand and mitigate slagging and fouling. Thus, while comprehensive, this document carries the title ''interim,'' with the idea that future work will provide additional insight. Primary target audiences include utility operators and engineers who face plant inefficiencies and significant operational and maintenance costs that are associated with ash deposition problems. Pulverized and cyclone-fired coal boilers are addressed specifically, although many of the diagnostics and solutions apply to other boiler types. Logic diagrams, ash deposit types, and boiler symptoms of ash deposition are used to aid the user in identifying an ash deposition problem, diagnosing and verifying root causes, determining remedial measures to alleviate or eliminate the problem, and then monitoring the situation to verify that the problem has been solved. In addition to a step-by-step method for identifying and remediating ash deposition problems, this guideline document (Appendix A) provides descriptions of analytical techniques for diagnostic testing and gives extensive fundamental and practical literature references and addresses of organizations that can provide help in alleviating ash deposition problems

  5. Mekanisme Proses Pemanasan Air Di Dalam Boiler Dengan Mempergunakan Heater Tambahan Untuk Efisiensi Pembakaran

    OpenAIRE

    Helmon Sihombing

    2010-01-01

    Pada proses pemanasan air, air yang berasal dari raw water (air tanah) tidak langsung dibakar didalam boiler. dalam hal ini digunakan peralatan instrumen Deaerator dan economizer yang berfungsi untuk pemanasan awal sebelum dibakar didalam boiler. Fungsi deaerator dan economizer ini adalah sebagai komponen pembantu untuk memanaskan air sebelum dibakar didalam boiler. Apabila pemanasan air langsung dilakukan didalam boiler maka akan membutuhkan waktu yang cukup lama dan menggunakan bahan b...

  6. High Efficiency - Reduced Emissions Boiler Systems for Steam, Heat, and Processing

    Science.gov (United States)

    2012-07-01

    enable energy saving necessary for obtaining Energy Star certification for the whole boiler system. Widespread boiler control updates could be possible...adaptability to different boiler and oil/gas burner configurations, and extensibility to operation with nonconventional fuels (e.g., biogas and syngas...typically operating below or slightly above 80%. Higher efficiency improvements can certainly be obtained via boiler replacement and adoption of

  7. Modelling of a one pass smoke tube boiler

    DEFF Research Database (Denmark)

    Karstensen, Claus M. S.; Sørensen, Kim

    2004-01-01

    A nonlinear state-space model with five states describing a one pass smoke tube boiler has been formulated. By means of mass- and energy-balance the model describes the dynamics of the Furnace, the Convection Zone and the Water/Steam Part and the three sub models are merged into an overall model....... The model is further linearized for use in a linear control design. The simulations have been carried out by means of MATLAB/SIMULINK and the models have been verified with measurements from a full scale boiler plant. Parameters in the model that are difficult to calculate have been estimated and the method...

  8. Heat losses in power boilers caused by thermal bridges

    Directory of Open Access Journals (Sweden)

    Kocot Monika

    2017-01-01

    Full Text Available In this article the analysis of heat losses caused by thermal bridges that occur in the steam boiler OP-140 is presented. Identification of these bridges were conducted with use of thermographic camera. Heat losses were evaluated based on methodology of VDI 4610 standard, but instead of its simplified equations, criterial equations based on Nusselt number were used. Obtained values of annual heat losses and heat flux density corresponding to the fully insulated boiler surfaces were compared to heat losses generated by thermal bridges located in the same areas. The emphasis is put on the role of industrial insulation in heat losses reduction.

  9. High Temperature Corrosion in Biomass-Fired Boilers

    DEFF Research Database (Denmark)

    Henriksen, Niels; Montgomery, Melanie; Hede Larsen, Ole

    2002-01-01

    condense on superheater components. This gives rise to specific corrosion problems not previously encountered in coal-fired power plants. The type of corrosion attack can be directly ascribed to the composition of the deposit and the metal surface temperature. To avoid such high corrosion rates, woodchip...... has also been utilised as a fuel. Combustion of woodchip results in a smaller amount of ash, and potassium and chlorine are present in lesser amounts. However, significant corrosion rates were still seen. A case study of a woodchip fired boiler is described. The corrosion mechanisms in both straw-fired...... and woodchip fired boilers are discussed....

  10. A METHOD FOR EXERGY ANALYSIS OF SUGARCANE BAGASSE BOILERS

    Directory of Open Access Journals (Sweden)

    CORTEZ L.A.B.

    1998-01-01

    Full Text Available This work presents a method to conduct a thermodynamic analysis of sugarcane bagasse boilers. The method is based on the standard and actual reactions which allows the calculation of the enthalpies of each process subequation and the exergies of each of the main flowrates participating in the combustion. The method is presented using an example with real data from a sugarcane bagasse boiler. A summary of the results obtained is also presented together based on the 1st Law of Thermodynamics analysis, the exergetic efficiencies, and the irreversibility rates. The method presented is very rigorous with respect to data consistency, particularly for the flue gas composition.

  11. 46 CFR 78.33-1 - Repairs of boiler and pressure vessels.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 3 2010-10-01 2010-10-01 false Repairs of boiler and pressure vessels. 78.33-1 Section... OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment § 78.33-1 Repairs of boiler and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the chief engineer shall...

  12. Pencegahan Korosi Dengan Boiler Water Treatment (Bwt) Pada Ketel Uap Kapal.

    OpenAIRE

    Suleman, Suleman

    2007-01-01

    This paper explained about a using of Boiler Water Treatment (BWT) as corrosion protection for boiler on ship. BWT used as addition on boiler water, which used destilat water. As experiment results, BWT used on destilat water and destilat - seawater mixed given not koagulan patch on. The simulation given not satisfied results, caused by good not equipment.

  13. Aspects of new material application for boilers construction; Aspekty wdrazania nowych materialow w budowie kotlow

    Energy Technology Data Exchange (ETDEWEB)

    Czerniawski, R. [RAFAKO S.A., Raciborz (Poland)

    1996-12-31

    Review of steel types commonly used for energetic boilers construction has been done. The worldwide trends in new materials application for improvement of boilers quality have been discussed. The mechanical properties of boiler construction steels have been shown and compared. 3 refs, 5 figs, 1 tab.

  14. 46 CFR 97.15-15 - Examination of boilers and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Examination of boilers and machinery. 97.15-15 Section... VESSELS OPERATIONS Tests, Drills, and Inspections § 97.15-15 Examination of boilers and machinery. It shall be the duty of the chief engineer when assuming charge of the boilers and machinery of a vessel to...

  15. 46 CFR 32.35-1 - Boilers and machinery-TB/ALL.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 1 2010-10-01 2010-10-01 false Boilers and machinery-TB/ALL. 32.35-1 Section 32.35-1 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY TANK VESSELS SPECIAL EQUIPMENT, MACHINERY, AND HULL REQUIREMENTS Main and Auxiliary Machinery § 32.35-1 Boilers and machinery—TB/ALL. Boilers, main and auxiliary...

  16. 46 CFR 109.421 - Report of repairs to boilers and pressure vessels.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Report of repairs to boilers and pressure vessels. 109... Report of repairs to boilers and pressure vessels. Before making repairs, except normal repairs and maintenance such as replacement of valves or pressure seals, to boilers or unfired pressure vessels in...

  17. 7 CFR 51.2833 - U.S. No. 1 Boilers.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false U.S. No. 1 Boilers. 51.2833 Section 51.2833 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards...) Grades § 51.2833 U.S. No. 1 Boilers. U.S. No. 1 Boilers consists of onions which meet all the...

  18. 46 CFR 50.05-5 - Existing boilers, pressure vessels or piping systems.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Existing boilers, pressure vessels or piping systems. 50... ENGINEERING GENERAL PROVISIONS Application § 50.05-5 Existing boilers, pressure vessels or piping systems. (a) Whenever doubt exists as to the safety of an existing boiler, pressure vessel, or piping system, the marine...

  19. 46 CFR 97.30-1 - Repairs to boilers and pressure vessels.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Repairs to boilers and pressure vessels. 97.30-1 Section... VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment § 97.30-1 Repairs to boilers and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the chief engineer...

  20. 46 CFR 78.17-30 - Examination of boilers and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 3 2010-10-01 2010-10-01 false Examination of boilers and machinery. 78.17-30 Section... OPERATIONS Tests, Drills, and Inspections § 78.17-30 Examination of boilers and machinery. It shall be the duty of the chief engineer when assuming charge of the boilers and machinery of a vessel to examine...

  1. 46 CFR 167.25-1 - Boilers, pressure vessels, piping and appurtenances.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Boilers, pressure vessels, piping and appurtenances. 167... SCHOOLS PUBLIC NAUTICAL SCHOOL SHIPS Marine Engineering § 167.25-1 Boilers, pressure vessels, piping and... the following standards for boilers, pressure vessels, piping and appurtenances: (1) Marine...

  2. 46 CFR 196.15-15 - Examination of boilers and machinery.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Examination of boilers and machinery. 196.15-15 Section... VESSELS OPERATIONS Test, Drills, and Inspections § 196.15-15 Examination of boilers and machinery. (a) It shall be the duty of the chief engineer when he assumes charge of the boilers and machinery of a vessel...

  3. 46 CFR 62.35-20 - Oil-fired main boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Oil-fired main boilers. 62.35-20 Section 62.35-20... AUTOMATION Requirements for Specific Types of Automated Vital Systems § 62.35-20 Oil-fired main boilers. (a) General. (1) All main boilers, regardless of intended mode of operation, must be provided with the...

  4. 46 CFR 196.30-1 - Repairs to boilers and pressure vessels.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Repairs to boilers and pressure vessels. 196.30-1... VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment § 196.30-1 Repairs to boilers and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the Chief Engineer...

  5. 46 CFR 35.25-1 - Examination of boilers and machinery by engineer-T/ALL.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 1 2010-10-01 2010-10-01 false Examination of boilers and machinery by engineer-T/ALL... Engine Department § 35.25-1 Examination of boilers and machinery by engineer—T/ALL. It shall be the duty of an engineer when assuming charge of the boilers to examine the same forthwith and thoroughly. If...

  6. Boiler corrosion (citations from the NTIS data base). Report for 1964-Jul 76

    International Nuclear Information System (INIS)

    Smith, M.F.

    1976-07-01

    Research on design, improved efficiency, materials, cathodic protection, corrosion inhibiting additives and combustion in coal and fuel oil fired boilers are cited. Corrosion from limestone injection for pollution control, magnetohydrodynamics, ship boilers, and nuclear power plant boilers are included. (This updated bibliography contains 86 abstracts, 9 of which are new entries to the previous edition.)

  7. 46 CFR 167.25-5 - Inspection of boilers, pressure vessels, piping and appurtenances.

    Science.gov (United States)

    2010-10-01

    ...) NAUTICAL SCHOOLS PUBLIC NAUTICAL SCHOOL SHIPS Marine Engineering § 167.25-5 Inspection of boilers, pressure vessels, piping and appurtenances. The inspection of boilers, pressure vessels, piping and appurtenances... 46 Shipping 7 2010-10-01 2010-10-01 false Inspection of boilers, pressure vessels, piping and...

  8. 46 CFR 52.01-35 - Auxiliary, donkey, fired thermal fluid heater, and heating boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Auxiliary, donkey, fired thermal fluid heater, and... (CONTINUED) MARINE ENGINEERING POWER BOILERS General Requirements § 52.01-35 Auxiliary, donkey, fired thermal... requirements for miscellaneous boiler types, such as donkey, fired thermal fluid heater, heating boiler, etc...

  9. Real-time monitoring energy efficiency and performance degradation of condensing boilers

    NARCIS (Netherlands)

    Baldi, S.; Le, Q.T.; Holub, O.; Endel, P

    2017-01-01

    Condensing boilers achieve higher efficiency than traditional boilers by using waste heat in flue gases to preheat cold return water entering the boiler. Water vapor produced during combustion is condensed into liquid form, thus recovering its latent heat of vaporization, leading to around 10–12%

  10. 46 CFR 63.25-3 - Electric hot water supply boilers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Electric hot water supply boilers. 63.25-3 Section 63.25... water supply boilers. (a) Electric hot water supply boilers that have a capacity not greater than 454... section except the periodic testing required by paragraph (j) of this section. Electric hot water supply...

  11. SRC burn test in 700-hp oil-designed boiler. Annex Volume C. Boiler emission report. Final technical report

    Energy Technology Data Exchange (ETDEWEB)

    1983-09-01

    The Solvent-Refined Coal (SRC) test burn program was conducted at the Pittsburgh Energy Technology Center (PETC) located in Bruceton, Pa. One of the objectives of the study was to determine the feasibility of burning SRC fuels in boilers set up for fuel oil firing and to characterize emissions. Testing was conducted on the 700-hp oil-fired boiler used for research projects. No. 6 fuel oil was used for baseline data comparison, and the following SRC fuels were tested: SRC Fuel (pulverized SRC), SRC Residual Oil, and SRC-Water Slurry. Uncontrolled particulate emission rates averaged 0.9243 lb/10/sup 6/ Btu for SRC Fuel, 0.1970 lb/10/sup 6/ Btu for SRC Residual Oil, and 0.9085 lb/10/sup 6/ Btu for SRC-Water Slurry. On a lb/10/sup 6/ Btu basis, emissions from SRC Residual Oil averaged 79 and 78%, respectively, lower than the SRC Fuel and SRC-Water Slurry. The lower SRC Residual Oil emissions were due, in part, to the lower ash content of the oil and more efficient combustion. The SRC Fuel had the highest emission rate, but only 2% higher than the SRC-Water Slurry. Each fuel type was tested under variable boiler operating parameters to determine its effect on boiler emissions. The program successfully demonstrated that the SRC fuels could be burned in fuel oil boilers modified to handle SRC fuels. This report details the particulate emission program and results from testing conducted at the boiler outlet located before the mobile precipitator take-off duct. The sampling method was EPA Method 17, which uses an in-stack filter.

  12. ESTUDIO DIELECTROMETRICO DE EMULSIONES Y AGENTES EMULSIFICANTES

    Directory of Open Access Journals (Sweden)

    Juan José Llovera González

    2011-03-01

    Full Text Available La permitividad de las mezclas de líquidos emulsificantes es un parámetro físico de interes en la determinación delgrado de asociación molecular de dichos líquidos. Las fórmulas semiempíricas conocidas para calcular la permitividadde dichas mezclas no reproducen en algunos casos los valores experimentales obtenidos, en particular esto ocurre enel caso de líquidos de estructura molecular anfifílica. En este trabajo se presentan los resultados obtenidos en elestudio de la permitividad de mezclas de líquidos emulsificantes asi como una fórmula que permite ajustar los resultadosexperimentales con un buen grado de precisión.  The dielectric constant of the mixtures of surfactants liquids of complex molecular structure is a physical parameterof interest in the determination of the degree of molecular association of this liquids. The formulas well-knownsemiempíricas to calculate the dielectric constant of this mixtures don't reproduce in some cases the obtainedexperimental values, in particular this happens in the case of liquids of anphiphylic molecular structure. In thiswork the results are presented obtained in the study of the dielectric constant of mixtures of these liquids as well asone formulates that it allows to adjust the experimental results with a good degree of precision.

  13. Detección de mutacarcinógenos y genotoxicidad en aguas residuales que surten dos plantas de tratamiento de agua de consumo

    Directory of Open Access Journals (Sweden)

    LY. Orozco

    2001-07-01

    Full Text Available Las aguas residuales están cargadas de gran variedad de mutacarcinógenos entre ellos Hidro-carburos Policíclicos aromáticos, nitrosaminas y aminas Heterocíclicas todos ellos formadosdurante la combustión de material orgánico y en alimentos proteicos cocidos a altas tempe-raturas. Dichos mutacarcinógenos llegan a las aguas residuales especialmente a través de laorina y heces. Las aguas residuales procedentes de la población del Retiro son vertidas al ríoPantanillo después de ser tratadas en una planta a base de lodos activados. Este río surte repre-sas que alimentan las plantas de tratamiento de agua de consumo la Ayurá y Rionegro quedistribuyen agua potable a más de 2’000.000 de habitantes.

  14. Derecho humano al agua y principio de unidad de gestión

    Directory of Open Access Journals (Sweden)

    Alma Patricia Domínguez Alonso

    2014-04-01

    Full Text Available El trabajo analiza el reciente reconocimiento a nivel internacional delDerecho humano al agua, que ha abierto una nueva perspectiva desdela que abordar el uso y gestión de este decisivo recurso para la vidaen el planeta. Un agua potable limpia y el saneamiento son esencialespara la realización de todos los derechos humanos. En este sentido,revista mucha importancia el principio de unidad de gestión de lasaguas, que supone que las aguas de una misma cuenca -en cuantoforman un conjunto integrado- sean gestionadas de forma homogénea.El objetivo de un buen estado de las aguas debe perseguirse en cadacuenca hidrográfica, de modo que se coordinen las medidas relativasa las aguas superficiales y las aguas subterráneas pertenecientes almismo sistema ecológico, hidrológico e hidrogeológico.

  15. SOURCE SAMPLING FINE PARTICULATE MATTER: WOOD-FIRED INDUSTRIAL BOILER

    Science.gov (United States)

    The report provides a profile for a wood-fired industrial boiler equipped with a multistage electrostatic precipitator control device. Along with the profile of emissions of fine particulate matter of aerodynamic diameter of 2.5 micrometers or less (PM-2.5), data are also provide...

  16. Integrated boiler, superheater, and decomposer for sulfuric acid decomposition

    Science.gov (United States)

    Moore, Robert [Edgewood, NM; Pickard, Paul S [Albuquerque, NM; Parma, Jr., Edward J.; Vernon, Milton E [Albuquerque, NM; Gelbard, Fred [Albuquerque, NM; Lenard, Roger X [Edgewood, NM

    2010-01-12

    A method and apparatus, constructed of ceramics and other corrosion resistant materials, for decomposing sulfuric acid into sulfur dioxide, oxygen and water using an integrated boiler, superheater, and decomposer unit comprising a bayonet-type, dual-tube, counter-flow heat exchanger with a catalytic insert and a central baffle to increase recuperation efficiency.

  17. Wylfa nuclear boiler repair. How a major problem was solved

    International Nuclear Information System (INIS)

    1977-09-01

    The CEGB has published a booklet, with coloured illustrations, that describes in detail the story of an unusually difficult boiler repair on a Magnox reactor at Wylfa nuclear power station. Boiler leaks affected the operation of No. 2 reactor in 1972, and persisted during 1973. A special procedure was developed for plugging the leaks using a remote welding machine but with the incidence of leaks continuing attempts were made to obtain a specimen of leaking tube by cutting through the boiler support tank to gain access. Eventually the fault was then traced to excessive relative motion between the tubes and support clips. Remedial work took seven months and was completed in December 1975. The start of the problem and the method of plugging the leaks is described. Details are given of the investigation leading to the obtaining and examination of a sample of leaking tube and the determination of the fault. Establishment of the cause as an unusual form of resonant vibration causing wear and fretting in clip-to-tube positions in the economiser region of the boiler is described in detail. The difficulties and accomplishments of the repair work are detailed. Finally the operation is looked at in retrospect and the experiences gained are summarised. (UK)

  18. Hardware and software techniques for boiler operation and management

    Energy Technology Data Exchange (ETDEWEB)

    Kobayashi, Hiroshi (Hirakawa Iron Works, Ltd., Osaka (Japan))

    1989-04-01

    A study was conducted on the requirements for easy-operable boiler from the view points of hardware and software technologies. Relation among efficiency, energy-saving, and economics, and control of total emission regarding low NOx operation, were explained, with suggestion of orientation to developed necessary hard- and soft- ware for the realization. 8 figs.

  19. Creep analysis of boiler tubes by fem | Taye | Zede Journal

    African Journals Online (AJOL)

    In this paper an analysis is developed for the determination of creep deformation of an axisymmetric boiler tubes subjected to axisymmetric loads. The stresses and the permanent strains at a particular time and at the steady state condition, resulting from loading of the tube under constant internal pressure and elevated ...

  20. assessment of some performance characteristics of refuse boiler ...

    African Journals Online (AJOL)

    TIMZY

    2013-07-02

    Jul 2, 2013 ... A pioneer palm oil boiler unit, in an immense power self-contained oil mill, impaired by many years of accumulated ... revealed that under a single shift operating mode (8 hours), a time saving of 72 minutes arising from the effectiveness of ... electric power generation and for other processing equipment and ...

  1. Oxygen pitting failure of a bagasse boiler tube

    CSIR Research Space (South Africa)

    Heyes, AM

    2001-04-01

    Full Text Available Examination of a failed roof tube from a bagasse boiler showed transverse through-cracks and extensive pitting. The pitting was typically oxygen induced pitting and numerous fatigue cracks had started within these pits. It is highly probable...

  2. Log-fueled boilers; Les chaudieres a buches

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-07-01

    This document describes the different technologies of wood boilers fueled with logs (ascending combustion and natural draught, horizontal combustion and natural draught, reverse combustion and natural draught, reverse combustion and forced draught), their advantages and drawbacks, selection criteria and installation rules. (J.S.)

  3. 40 CFR 65.149 - Boilers and process heaters.

    Science.gov (United States)

    2010-07-01

    ... stream is not introduced as or with the primary fuel, a temperature monitoring device in the fire box...-throughput transfer racks, as applicable, shall meet the requirements of this section. (2) The vent stream... thermal units per hour) or greater. (ii) A boiler or process heater into which the vent stream is...

  4. SEM Investigation of Superheater Deposits from Biomass-Fired Boilers

    DEFF Research Database (Denmark)

    Jensen, Peter Arendt; Frandsen, Flemming; Hansen, Jørn

    2004-01-01

    , mature superheater deposit samples were extracted from two straw-fired boilers, Masnedø and Ensted, with fuel inputs of 33 MWth and 100 MWth, respectively. SEM (scanning electron microscopy) images and EDX (energy dispersive X-ray) analyses were performed on the deposit samples. Different strategies...

  5. A NOx control regulation for electric utility boilers in California

    International Nuclear Information System (INIS)

    Price, D.R.

    1992-01-01

    The reduction of oxides of nitrogen emissions is becoming an increasingly important part of ozone attainment plans. As a part of its ozone attainment plan, the Ventura County (California) Air Pollution Control Board adopted in June, 1991, a regulation (Rule 59) to limit oxides of nitrogen emissions from four electrical utility boilers in the county. Rule development took two years and involved considerable public input. The emission limit for each of two 750 megawatt units is set at 0.10 pounds of NO x per megawatt-hour net after June, 1994. The emission limit for each of two 215 megawatt units is 0.20 pounds of NO x per megawatt-hour after June, 1996. Additional limitations are included for fuel oil operation. The rule does not specify an emission control technology. Conventional selective catalytic reduction, urea injection and combustion modifications are considered the technologies most likely to be used to comply. At $17,613 per ton of NO x reduced for the two large boilers and $8.992 per ton of NO x reduced for the small boilers, the rule is considered cost effective. The capital cost for conventional selective catalytic reduction systems on all four boilers is expected to be in excess of $210,000,000

  6. Constrained control of a once-through boiler with recirculation

    DEFF Research Database (Denmark)

    Trangbæk, K

    2008-01-01

    There is an increasing need to operate power plants at low load for longer periods of time. When a once-through boiler operates at a sufficiently low load, recirculation is introduced, significantly altering the control structure. This paper illustrates the possibilities for using constrained con...

  7. AUTOMATIC CONTROL SYSTEM ОF REGIONAL BOILER HOUSE

    Directory of Open Access Journals (Sweden)

    V. A. Sednin

    2005-01-01

    Full Text Available Implementation of an automatic control system is one of directions that promotes to increase an operational efficiency of a heat supply system. A heating boiler house in Surgut (Russia is taken as an example to demonstrate an actual realization of such system.

  8. A risk approach to the management of boiler tube thinning

    International Nuclear Information System (INIS)

    Noori, Soudabeh A.; Price, John W.H.

    2006-01-01

    A large set of industrial thickness inspection data covering four boiler units of a power station over a period of five years was made available to the authors. The measurements were made in regions of the boiler where corrosion/erosion was the major cause of failure of the boiler tubes. There were over 40,000 separately measured data points in the data and all were collected with some care and expense. In the development of maintenance strategies for equipment, this type of data is typical of the data that must be collected and assessed. This data thus represents an opportunity to evaluate the ability to generate a useful risk approach to the management of the tubing. An important example of a risk-based approach is the American Petroleum Institute (API) Risk Based Inspection ('RBI'), API 581. A variety of problems were encountered applying this to boiler tubes. The problems include irrelevant API 581 corrosion rate tables, lack of information on how to analyse inspection data, difficulty of dealing with multiple inspection categories and lack of suitable direction for programming inspection intervals

  9. Reliability of non-heated tube bends of boilers

    International Nuclear Information System (INIS)

    Bugaj, N.V.; Akhremenko, V.L.; Zamotaev, V.S.

    1984-01-01

    Bend failures are described for non-heated boiler tubes of 12Kh1MF and 20 steels. Methods of reliability evaluations are presented which permit revealing and replacing the bends with inadequate resources. Influences of operation conditions on bend durability is shown as well as the factors which are dominating at bend failures

  10. Life cycle analysis of small scale pellet boilers characterized by high efficiency and low emissions

    International Nuclear Information System (INIS)

    Monteleone, B.; Chiesa, M.; Marzuoli, R.; Verma, V.K.; Schwarz, M.; Carlon, E.; Schmidl, C.; Ballarin Denti, A.

    2015-01-01

    Highlights: • LCA was performed on innovative small scale pellet boilers. • Pellet boilers impacts were compared to oil and natural gas boilers impacts. • Both literature and experimental data were used for life cycle analysis. • The environmental impact due to all life cycle phases was envisaged. • Sensitivity tests evidenced realistic ways for pellet boilers impact reduction. - Abstract: This study focuses on the environmental impact assessment through Life Cycle Analysis (LCA) of two innovative 10 kW pellet boilers. In particular, the second boiler represents a technological evolution of the first one developed to improve its performance in terms of efficiency and environmental impact. For both boilers, emission factors measured during laboratory tests (full load tests and specific load cycle tests representative of real life boiler operation) have been used as input data in the life cycle analysis. The SimaPro software (v.8.0.4.30) was used for the LCA and the ReCiPe Midpoint method (European version H) was chosen to assess the environmental impact of all boilers (according to LCA ISO standards). In addition, the ReCiPe Endpoint method was used to compare the final results of all 5 boilers with literature data. The pelletisation process represented the most relevant share of the overall environmental impact followed by the operational phase, the manufacturing phase and the disposal phase. A sensitivity analysis performed on the most efficient pellet boiler evidenced the variation of the boiler’s environmental impact as a function of PM10 and NO X emission factors with respect to emission factors monitored during boiler full load operation. Moreover, the reduction of the boiler’s weight and the adoption of new electronic components led to a consistent reduction (−18%) of its environmental impact with respect to the previous technology. A second LCA has been carried on for a 15 kW oil boiler, a 15 kW natural gas boiler and a 15 kW pellet boiler

  11. Static stability characteristics of the boilers at Oldbury nuclear power station

    International Nuclear Information System (INIS)

    Paynter, R.J.; Rea, J.

    1986-01-01

    The cause of an intermittent load loss at Oldbury Nuclear Power Station is shown to be the high sensitivity of boiler performance to the imposed spatial distribution of boiler gas inlet temperature. This high sensitivity is demonstrated to be a function of the inherent static stability characteristics of the boilers. The installation of orifice plates with a high flow resistance into the feed pipework to the half boilers has greatly reduced the boiler sensitivity and eliminated the intermittent load loss so that, on average, higher electrical generation is obtained from the station. (author)

  12. Fuel quality and its effect on the design of power boilers in the USA

    Energy Technology Data Exchange (ETDEWEB)

    Kotler, V.R.

    1984-05-01

    Statistical data, taken from Power, Proceedings of the American Power Conference and others, on developments since the 1950s in boiler design caused by the increasing use of lower quality fuel (subbituminous and lignite coals) are presented. The effect of pollution regulations in the USA on boiler design is discussed. The results of a 16 year study by the TVA on the decrease in coal quality fired in its boilers and its effect on boiler efficiency are presented. Methods of transport are surveyed. Descriptions and characteristics of several modern boilers designed by Babcock and Wilcox, Combustion Engineering, Foster-Wheeler and Riley Stoker are given. 13 references.

  13. Multi-objective Optimization of Coal-fired Boiler Combustion Based on NSGA-II

    OpenAIRE

    Tingfang Yu; Hongzhen Zhu; Chunhua Peng

    2013-01-01

    NOx emission characteristics and overall heat loss model for a 300MW coal-fired boiler were established by Back Propagation (BP) neural network, by which the the functional relationship between outputs (NOx emissions & overall heat loss of the boiler) and inputs (operational parameters of the boiler) of a coal-fired boiler can be predicted. A number of field test data from a full-scale operating 300MWe boiler were used to train and verify the BP model. The NOx emissions & heat loss pr...

  14. Control of the Bed Temperature of a Circulating Fluidized Bed Boiler by using Particle Swarm Optimization

    Directory of Open Access Journals (Sweden)

    AYGUN, H.

    2012-05-01

    Full Text Available Circulating fluidized bed boilers are increasingly used in the power generation due to their higher combustion efficiency and lower pollutant emissions. Such boilers require an effective control of the bed temperature, because it influences the boiler combustion efficiency and the rate of harmful emissions. A Particle-Swarm-Optimization-Proportional-Integrative-Derivative (PSO-PID controller for the bed temperature of a circulating fluidized bed boiler is presented. In order to prove the capability of the proposed controller, its performances are compared at different boiler loads with those of a Fuzzy Logic (FL controller. The simulation results demonstrate some advantages of the proposed controller.

  15. Effect of Water Quality on the Performance of Boiler in Nigerian Petroleum Industry

    Directory of Open Access Journals (Sweden)

    J. O. ODIGURE

    2005-06-01

    Full Text Available This work investigates quality of water used in boilers of Refinery Company in Nigeria. The results shows that the quality of water fed to boilers are off specification. Low water quality used in boilers led to frequent failure of the boilers as a result of tube rupture. This has resulted into low capacity utilization and loss of processing fees. The poor performance of the boiler feed treatment plant is attributable to the deplorable condition of water intake plant, raw water treatment, demineralization plant, change in raw water quality and non-functioning of the polisher unit.

  16. Tratamiento de aguas industriales mediante reactor biológico de membranas

    OpenAIRE

    Aznar Jiménez, Antonio

    2008-01-01

    El Laboratorio de Ingeniería para el Tratamiento de Aguas de la Universidad Carlos III de Madrid, de investigación y servicios en el tratamiento de aguas residuales, optimiza el diseño y puesta a punto de reactores biológicos de membranas (MBR), indicados para obtener agua depurada de alta calidad y/o aumentar la capacidad de tratamiento.

  17. Agua y experiencia espiritual. Los jardines de letrados en China

    Directory of Open Access Journals (Sweden)

    Caroline Alder

    2007-10-01

    Es importante precisar que todas estas formas de shanshui están íntimamente relacionadas con las principales corrientes filosófico-religiosas chinas que son el confucianismo, el taoísmo y el budismo. En efecto, si el taoísmo postula que el orden cósmico está regido por dos fuerzas opuestas y complementarias, el yin y el yang, el paisaje, al ser considerado como una visión cultural del mundo y por ende de la naturaleza, considera como elementos fundamentales la montaña y el agua. La montaña, elemento yang, masculino, estático y luminoso y el agua, elemento yin, femenino, dinámico y obscuro. Estos dos elementos aparecen siempre juntos en las distintas formas de expresión del paisaje chino.

  18. 46 CFR 53.01-3 - Adoption of section IV of the ASME Boiler and Pressure Vessel Code.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Adoption of section IV of the ASME Boiler and Pressure...) MARINE ENGINEERING HEATING BOILERS General Requirements § 53.01-3 Adoption of section IV of the ASME Boiler and Pressure Vessel Code. (a) Heating boilers shall be designed, constructed, inspected, tested...

  19. Operator's Manual, Boiler Room Operations and Maintenance. Supplement A, Air Pollution Training Institute Self-Instructional Course SI-466.

    Science.gov (United States)

    Environmental Protection Agency, Research Triangle Park, NC. Air Pollution Training Inst.

    This Operator's Manual is a supplement to a self-instructional course prepared for the United States Environmental Protection Agency. This publication is the Boiler Room Handbook for operating and maintaining the boiler and the boiler room. As the student completes this handbook, he is putting together a manual for running his own boiler. The…

  20. 40 CFR 270.22 - Specific part B information requirements for boilers and industrial furnaces burning hazardous...

    Science.gov (United States)

    2010-07-01

    ... requirements for boilers and industrial furnaces burning hazardous waste. 270.22 Section 270.22 Protection of... requirements for boilers and industrial furnaces burning hazardous waste. When an owner or operator of a cement kiln, lightweight aggregate kiln, solid fuel boiler, liquid fuel boiler, or hydrochloric acid...

  1. Componente Cultura del Agua del PMGRH: plan de trabajo

    OpenAIRE

    Autoridad Nacional del Agua; Proyecto de Modernización de la Gestión de Recursos Hídricos

    2012-01-01

    Describe el plan de trabajo del Componente Cultura del Agua del Proyecto de Modernización de la Gestión de Recursos Hídricos (PMGRH) en relacion a dos aspectos estructurales del proyecto: 1. Mejora de la capacidad de la Gestión Integrada de Recursos Hídricos (GIRH) a nivel nacional y 2. Fortalecimiento de las capacidades de GIRH en las cuencas.

  2. Relaciones agua-solutos-matriz insoluble en algunos sistemas alimentarios.

    OpenAIRE

    Chenoll Cuadros, Maria De La Creu

    2008-01-01

    Una gran parte de los alimentos estructurados pueden considerarse, de forma simplificada, constituidos por tres componentes: una matriz insoluble (que puede ser, por ejemplo, proteica, o compuesta por carbohidratos), agua y una serie de sólidos solubles (añadidos o no). Las relaciones de estos componentes entre sí, sus interacciones, y el modo en que varían durante determinados procesos industriales son factores que condicionan sus propiedades, tales como nutricionales y de calidad sensorial ...

  3. Multi-unit shutdown due to boiler feedwater chemical excursion

    International Nuclear Information System (INIS)

    Diebel, M.E.

    1991-01-01

    Ontario Hydro's Bruce Nuclear Generating Station 'B' consists of four 935 W CANDU units located on the east shore of Lake Huron in the province of Ontario, Canada. On July 25 and 26, 1989 three of the four operating units were shutdown due to boiler feedwater chemical excursions initiated by a process upset in the Water Treatment Plant that provides demineralized make-up water to all four units. The chemicals that escaped from an ion exchange vessel during a routine regeneration very quickly spread through the condensate make-up system and into the boiler feedwater systems. This resulted in boiler sulfate levels exceeding shutdown limits. A total of 260 GWH of electrical generation was unexpectedly made unavailable to the grid at a time of peak seasonal demand. This event exposed several unforeseen deficiencies and vulnerabilities in the automatic demineralized water make-up quality protection scheme, system designs, operating procedures and the ability of operating personnel to recognize and appropriately respond to such an event. The combination of these factors contributed towards turning a minor system upset into a major multi-unit shutdown. This paper provides the details of the actual event initiation in the Water Treatment Plant and describes the sequence of events that led to the eventual shutdown of three units and near shutdown of the fourth. The design inadequacies, procedural deficiencies and operating personnel responses and difficulties are described. The process of recovering from this event, the flushing out of system piping, boilers and the feedwater train is covered as well as our experiences with setting up supplemental demineralized water supplies including trucking in water and the use of rental trailer mounted demineralizing systems. System design, procedural and operational changes that have been made and that are still being worked on in response to this event are described. The latest evidence of the effect of this event on boiler tube

  4. Staged fluidized-bed coal combustor for boiler retrofit

    International Nuclear Information System (INIS)

    Rehmat, A.; Dorfman, L.; Shibayama, G.; Waibel, R.

    1991-01-01

    The Advanced Staged Fluidized-Bed Coal Combustion System (ASC) is a novel clean coal technology for either coal-fired repowering of existing boilers or for incremental power generation using combined-cycle gas turbines. This new technology combines staged combustion for gaseous emission control, in-situ sulfur capture, and an ash agglomeration/vitrification process for the agglomeration/vitrification of ash and spent sorbent, thus rendering solid waste environmentally benign. The market for ASC is expected to be for clean coal-fired repowering of generating units up to 250 MW, especially for units where space is limited. The expected tightening of the environmental requirements on leachable solids residue by-products could considerably increase the marketability for ASC. ASC consists of modular low-pressure vessels in which coal is partially combusted and gasified using stacked fluidized-bed processes to produce low-to-medium-Btu, high-temperature gas. This relatively clean fuel gas is used to repower/refuel existing pulverized-coal, natural gas, or oil-fired boilers using bottom firing and reburning techniques. The benefits of ASC coal-fired repowering include the ability to repower boilers without obtaining additional space while meeting the more stringent environmental requirements of the future. Low NO x , SO x , and particulate levels are expected while a nonleachable solid residue with trace metal encapsulation is produced. ASC also minimizes boiler modification and life-extension expenditures. Repowered efficiencies can be restored to the initial operating plant efficiency, and the existing boiler capacity can be increased by 10%. Preliminary cost estimates indicate that ASC will have up to a $250/kW capital cost advantage over existing coal-fired repowering options. 4 figs., 4 tabs

  5. A hybrid solar/diesel water heating system: in medicine area in a hospital in Mexico city; Sistema hibrido de energia solar y diesel para calentamiento de agua: caso en el area de medicina fisica en un hospital en la ciudad de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Nolasco Mejia, Miguel; Wolpert Kuri, Jorge [UNAM, Mexico, D.F. (Mexico)

    2000-07-01

    A hybrid solar/diesel water heating system for therapy in a hospital in Mexico is described in this paper. The use of solar energy in hospitals and clinics, represent an environmentally friendly alternative to the burning of fossil fuels. Analysis is made regarding the feasibility of integrating both solar energy and conventional energy (fuel oil) as back up, to satisfy the hot water demand for hydrotherapy in a hospital. Results from simulation show that solar energy is a cheap means to provide up to 60% of the hot water demand. The solar assisted system proposed uses flat plate solar collectors integrated with an existing hot water tank, where water is heated with vapor from a diesel ran boiler. This represents significant savings on the solar system cost. [Spanish] La utilizacion de la energia solar en hospitales y clinicas, representa una posibilidad para obtener ahorros importantes de energia para satisfacer la demanda de agua caliente. En el presente estudio se analiza la demanda de agua caliente para uso en medicina fisica (hidroterapia), en un hospital ubicado en la Cd. De Mexico y la factibilidad de usar la energia solar, empleando como apoyo el sistema tradicional de combustible fosil (diesel). Mediante un analisis termico se determina el calor necesario para satisfacer la demanda de agua caliente. El analisis economico muestra los costos del sistema solar, los ahorros que se tendran y el periodo de recuperacion de la inversion. Los resultados muestran que la utilizacion de la energia solar es factible debido a la disminucion tanto del consumo de combustible, como de las emisiones atmosfericas. Se propone la instalacion de un sistema solar con colectores planos y el aprovechamiento de uno de los dos tanques de agua caliente existentes, donde se efectua la trasferencia de calor al agua por medio de vapor, lo cual disminuye el costo del sistema solar. La aportacion solar puede ser mayor del 60%, el complemento sera aportado por el sistema tradicional con

  6. Deposit Probe Measurements in Danish Grate and Pulverized Fuel Biomass Power Boilers

    DEFF Research Database (Denmark)

    Hansen, Stine Broholm; Jensen, Peter Arendt; Jappe Frandsen, Flemming

    2012-01-01

    . Corresponding samples of fuels, ash deposits and fly ash have provided information on the transformation of inorganics in the boiler. Generally, grate fired boilers provide a fly ash containing high contents of K, Cl and S compared to the fuel ash, while suspension fired boilers fly ash has a composition nearly...... similar to the fuel ash. Inner most biomass deposits are always salt-rich, while thicker deposit layers also contain some Si and Ca. Deposit probe formation rate measurements have been performed in different ways on several boilers. Grate and suspension fired boilers seems to cause similar deposit...... formation rates. Suspension fired boilers generate more fly ash, while grate boilers form a fly ash with a higher fraction of melt formation (and thereby a higher sticking probability) at similar temperatures. For suspension fired units it is observed that wood with a lower ash content than straw gives rise...

  7. Recovery Act: Oxy-Combustion Technology Development for Industrial-Scale Boiler Applications

    Energy Technology Data Exchange (ETDEWEB)

    Levasseur, Armand

    2014-01-01

    This Topical Report outlines guidelines and key considerations for design and operation of pulverized coal-fired boilers for oxy-combustion. The scope addressed includes only the boiler island, not the entire oxy-fired CO{sub 2} capture plant. These guidelines are primarily developed for tangential-fired boilers and focus on designs capable of dual air and oxy-fired operation. The guidelines and considerations discussed are applicable to both new units and existing boiler retrofits. These guidelines are largely based on the findings from the extensive 15 MW{sub th} pilot testing and design efforts conducted under this project. A summary level description is provided for each major aspect of boiler design impacted by oxy-combustion, and key considerations are discussed for broader application to different utility and industrial designs. Guidelines address the boiler system arrangement, firing system, boiler thermal design, ducting, materials, control system, and other key systems.

  8. El agua virtual: una oportunidad para la Argentina en el contexto internacional actual

    OpenAIRE

    Jaime, Ana María

    2013-01-01

    En forma recurrente, se considera que el agua desempeñará en el siglo XXI, el rol que tuvo el petróleo en el siglo XX. La diferencia fundamental entre ambos recursos es que el agua es un “recurso finito, vulnerable y esencial para mantener la vida, el desarrollo y el medio ambiente”, según la definición de la Conferencia Internacional sobre el Agua y el Medio Ambiente realizada en la ciudad de Dublin en el año 1992. El agotamiento y la creciente escasez de agua en el mundo, el cambio climátic...

  9. El estudio de los paisajes del agua en una cuenca vertiente: Propuesta metodológica

    OpenAIRE

    Marina Frolova

    2008-01-01

    RESUMEN Este trabajo presenta los paisajes del agua como un marco metodológico para el estudio de problemas medioambientales relacionados con el agua. Se propone analizar los paisajes del agua en una escala integradora de una cuenca vertiente, considerándolos desde tres enfoques –sistémico, territorial y paisajístico-. Se bosqueja una primera aproximación al análisis de los paisajes del agua de la cuenca del Guadalquivir, presentándola como un complejo hidrosistema fluvial, como un territori...

  10. Dimensionamiento del sistema de tratamiento de aguas residuales industriales en la industria de la pintura

    OpenAIRE

    Guevara Gavilanes, Silvia; Parrales Baquerizo, Narcisa; Villamar Bajaña, Franklin

    2009-01-01

    Las aguas residuales en la Industria de la pintura son el conjunto de las aguas que son contaminadas durante su empleo en actividades de limpieza realizadas en el proceso de elaboración de las pinturas acuosas. Para reparar esta alteración a la naturaleza aplicaremos sistemas de tratamientos de aguas donde se realiza distintos procesos necesarios para poder llegar al estado inicial del agua sin contaminación, los sistemas de tratamiento no hacen otra cosa que separar todos los contaminante...

  11. Eficiencia en el uso del agua por las plantas

    Directory of Open Access Journals (Sweden)

    Hipólito Medrano

    2007-01-01

    Full Text Available La disponibilidad de agua es el principal factor limitante de la producción agrícola y ganadera en ambientes de clima mediterráneo. Limitación que, ante las previsiones de Cambio Climático Global realizadas por organismo internacionales, serán mucho mayores en los próximos años. En este escenario, la eficiencia en el uso de los recursos hídricos debe ser un aspecto transversal de las políticas públicas que debe, por tanto, ser afrontado desde diversos puntos de vista. En este sentido, uno de los temas claves a considerar es la eficiencia con la que las plantas usan el agua. El objetivo de este trabajo es hacer una revisión de los diferentes aspectos relacionados con este tema, considerando las diferentes escalas a las que se estudia la eficiencia en el uso del agua por las plantas (EUA, desde la hoja hasta el cultivo o el ecosistema. Así, se abordan las dificultades técnicas que existen para medir, de una forma precisa, la EUA de un cultivo o de un ecosistema, la importancia del ambiente y de las prácticas agronómicas como determinantes de la EUA, la diversidad genética inter e intraespecífica, y las implicaciones prácticas de estos factores a la hora de incrementar la EUA.

  12. MICROCONTAMINANTES EMERGENTES EN AGUAS: TIPOS Y SISTEMAS DE TRATAMIENTO

    Directory of Open Access Journals (Sweden)

    Yolanda Patiño

    2014-01-01

    Full Text Available En el presente artículo se revisan las distintas clases de contaminantes emergentes, su origen y uso, y su presencia en las cuencas españolas, tanto en aguas superficiales como subterráneas. Los microcontaminantes emergentes son compuestos de distinto origen y naturaleza que hasta ahora habían pasado inadvertidos debido a su baja concentración (en el orden de las ppb y sobre los que no hay regulación específica. Están divididos en seis grandes grupos y muchos de ellos se comportan como disruptores endocrinos, provocando efectos negativos sobre la salud humana y el medio ambiente. Se encuentran presentes en las aguas ya que las plantas de tratamiento de aguas residuales no están diseñadas para su eliminación, por lo que están siendo vertidos. Se discuten las distintas alternativas para su eliminación – tratamiento físico-químicos, biológicos y tecnologías híbridas - , destacando dentro de los procesos físico-químicos el empleo de procesos avanzados de oxidación (AOPs que están resultando muy prometedores.

  13. Dynamic Simulation of the Water-steam System in Once-through Boilers - Sub-critical Power Boiler Case -

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Seongil; Choi, Sangmin [Korea Advanced Institute of Science and Technology, Daejeon (Korea, Republic of)

    2017-05-15

    The dynamics of a water-steam system in a once-through boiler was simulated based on the physics-based modeling approach, representing the system in response to large load change or scale disturbance simulations. The modeling considered the mass, energy conservation, and momentum equation in the water pipe and the focus was limited to the sub-critical pressure region. An evaporator tube modeling was validated against the reference data. A simplified boiler system consisting of economizer, evaporator, and superheater was constructed to match a 500 MW power boiler. The dynamic response of the system following a disturbance was discussed along with the quantitative response characteristics. The dynamic response of the boiler system was further evaluated by checking the case of an off-design point operation of the feedwater-to-fuel supply ratio. The results re-emphasized the significance of controlling the feedwater-to-fuel supply ratio and additional design requirements of the water-steam separator and spray attemperator.

  14. Dynamic Simulation of the Water-steam System in Once-through Boilers - Sub-critical Power Boiler Case -

    International Nuclear Information System (INIS)

    Kim, Seongil; Choi, Sangmin

    2017-01-01

    The dynamics of a water-steam system in a once-through boiler was simulated based on the physics-based modeling approach, representing the system in response to large load change or scale disturbance simulations. The modeling considered the mass, energy conservation, and momentum equation in the water pipe and the focus was limited to the sub-critical pressure region. An evaporator tube modeling was validated against the reference data. A simplified boiler system consisting of economizer, evaporator, and superheater was constructed to match a 500 MW power boiler. The dynamic response of the system following a disturbance was discussed along with the quantitative response characteristics. The dynamic response of the boiler system was further evaluated by checking the case of an off-design point operation of the feedwater-to-fuel supply ratio. The results re-emphasized the significance of controlling the feedwater-to-fuel supply ratio and additional design requirements of the water-steam separator and spray attemperator.

  15. 3rd symposium on high-efficiency boiler technology: potential, performance, shortcomings of natural gas fuelled high-efficiency boilers

    International Nuclear Information System (INIS)

    1993-01-01

    The brochure contains abstracts of the papers presented at the symposium. The potential, performance and marketing problems of natural gas high-efficiency boiler systems are outlined, and new ideas are presented for gas utilities, producers of appliances, fitters, and chimneysweeps. 13 papers are available as separate regards in this database. (HW) [de

  16. Increase of efficiency and reliability of liquid fuel combustion in small-sized boilers

    Science.gov (United States)

    Roslyakov, P. V.; Proskurin, Yu V.; Ionkin, I. L.

    2017-11-01

    One of the ways to increase the efficiency of using fuels is to create highly efficient domestic energy equipment, in particular small-sized hot-water boilers in autonomous heating systems. Increasing the efficiency of the boiler requires a reduction in the temperature of the flue gases leaving, which, in turn, can be achieved by installing additional heating surfaces. The purpose of this work was to determine the principal design solutions and to develop a draft design for a high-efficiency 3-MW hot-water boiler using crude oil as its main fuel. Ensuring a high efficiency of the boiler is realized through the use of an external remote economizer, which makes it possible to reduce the dimensions of the boiler, facilitate the layout of equipment in a limited size block-modular boiler house and virtually eliminate low-temperature corrosion of boiler heat exchange surfaces. In the article the variants of execution of the water boiler and remote economizer are considered and the preliminary design calculations of the remote economizer for various schemes of the boiler layout in the Boiler Designer software package are made. Based on the results of the studies, a scheme was chosen with a three-way boiler and a two-way remote economizer. The design of a three-way fire tube hot water boiler and an external economizer with an internal arrangement of the collectors, providing for its location above the boiler in a block-modular boiler house and providing access for servicing both a remote economizer and a hot water boiler, is proposed. Its mass-dimensional and design parameters are determined. In the software package Boiler Designer thermal, hydraulic and aerodynamic calculations of the developed fire tube boiler have been performed. Optimization of the boiler design was performed, providing the required 94% efficiency value for crude oil combustion. The description of the developed flue and fire-tube hot water boiler and the value of the main design and technical and

  17. Iron aluminide weld overlay coatings for boiler tube protection in coal-fired low NOx boilers

    Energy Technology Data Exchange (ETDEWEB)

    Banovic, S.W.; DuPont, J.N.; Marder, A.R. [Lehigh Univ., Bethlehem, PA (United States). Energy Research Center

    1997-12-01

    Iron aluminide weld overlay coatings are currently being considered for enhanced sulfidation resistance in coal-fired low NO{sub x} boilers. The use of these materials is currently limited due to hydrogen cracking susceptibility, which generally increases with an increase in aluminum concentration of the deposit. The overall objective of this program is to attain an optimum aluminum content with good weldability and improved sulfidation resistance with respect to conventional materials presently in use. Research has been initiated using Gas Tungsten Arc Welding (GTAW) in order to achieve this end. Under different sets of GTAW parameters (wire feed speed, current), both single and multiple pass overlays were produced. Characterization of all weldments was conducted using light optical microscopy, scanning electron microscopy, and electron probe microanalysis. Resultant deposits exhibited a wide range of aluminum contents (5--43 wt%). It was found that the GTAW overlays with aluminum contents above {approximately}10 wt% resulted in cracked coatings. Preliminary corrosion experiments of 5 to 10 wt% Al cast alloys in relatively simple H{sub 2}/H{sub 2}S gas mixtures exhibited corrosion rates lower than 304 stainless steel.

  18. ¿Agua dividida, agua compartida? Acuiferos transfronterizos en Sudamérica, una aproximación

    Directory of Open Access Journals (Sweden)

    Carmen Maganda

    2008-01-01

    Full Text Available Este artículo aborda la política fronteriza del agua en Sudamérica, con una discusión específica sobre la frontera Colombia-Venezuela. Con una perspectiva comparativa, la autora aborda el impacto de los procesos políticos en la distribución y acceso al agua en regiones fronterizas. La autora señala que la internacionalización del manejo del agua en zonas fronterizas debilita la participación pública debido al limitado conocimiento de la agenda ambiental de los macro esfuerzos regionales como la Comunidad Andina y sus instituciones. Los ríos o acuíferos compartidos son recursos «invisibles» para el común de los ciudadanos en Sudamérica, que pueden convertirse en fuente potencial de conflictos o de cooperación e integración regional. La cooperación es definitivamente necesaria en estos casos. Pocos esfuerzos se han registrado recientemente en Latinoamérica. Entre estos, destaca el programa Acuíferos Transfronterizos de las Américas (ISARM en Inglés, creado en 2002 por la UNESCO. Es particularmente importante poner atención en la falta de acuerdos trasnacionales sobre acuíferos transfronterizos en Sudamérica para compartir responsabilidades y toma de decisiones sobre el manejo de estas aguas. La autora señala el caso particular del acuífero transfronterizo Cúcuta-San Antonio sin un aparente manejo binacional entre Colombia y Venezuela.

  19. ¿Agua dividida, agua compartida? Acuiferos transfronterizos en Sudamérica, una aproximación

    Directory of Open Access Journals (Sweden)

    Carmen Maganda

    Full Text Available Este artículo aborda la política fronteriza del agua en Sudamérica, con una discusión específica sobre la frontera Colombia-Venezuela. Con una perspectiva comparativa, la autora aborda el impacto de los procesos políticos en la distribución y acceso al agua en regiones fronterizas. La autora señala que la internacionalización del manejo del agua en zonas fronterizas debilita la participación pública debido al limitado conocimiento de la agenda ambiental de los macro esfuerzos regionales como la Comunidad Andina y sus instituciones. Los ríos o acuíferos compartidos son recursos ''invisibles'' para el común de los ciudadanos en Sudamérica, que pueden convertirse en fuente potencial de conflictos o de cooperación e integración regional. La cooperación es definitivamente necesaria en estos casos. Pocos esfuerzos se han registrado recientemente en Latinoamérica. Entre estos, destaca el programa Acuíferos Transfronterizos de las Américas (ISARM en Inglés, creado en 2002 por la UNESCO. Es particularmente importante poner atención en la falta de acuerdos trasnacionales sobre acuíferos transfronterizos en Sudamérica para compartir responsabilidades y toma de decisiones sobre el manejo de estas aguas. La autora señala el caso particular del acuífero transfronterizo Cúcuta-San Antonio sin un aparente manejo binacional entre Colombia y Venezuela.

  20. IMPACTO AMBIENTAL DE LOS CONTAMINANTES PROVENIENTES DE AGUAS RESIDUALES DE FEED-LOT SOBRE AGUAS SUBTERRÁNEAS

    Directory of Open Access Journals (Sweden)

    Walter M. Glessi

    2012-01-01

    Full Text Available En este trabajo se investigó el impacto de los contaminantes de efluentes líquidos generados por doce feedlot del sudeste de la Provincia de Buenos Aires, Argentina, con el objeto de determinar los aspectos significativos sobre la vulnerabilidad de las aguas subterráneas. Se utilizó la Guía metodológica de Evaluación de Impacto Ambiental propuesta por Conesa (2010 partiendo de do ce Estudios de Impacto Ambiental y analizando como influye la actividad sobre el agua subterránea. Se analizó la dimensión de los establecimientos partiendo del número de animales, el tipo de suelo, profundidad freática y tipo de práctica (estacional o continua, así como las doce matrices de impacto en la emisión de contaminantes sobre el medio físico agua. Se obtuvo que los parámetros de mayor incidencia son: el grado de Destrucción, el área de influencia, el momento de manifestación del efecto y la regularidad de la manifestación.

  1. Estudio de comparación del tratamiento de aguas residuales domésticas utilizando lentejas y buchón de agua en humedales artificiales

    OpenAIRE

    Rodríguez-Miranda, Juan Pablo; Gómez, Esteban; Garavito, Laura; López, Francy

    2010-01-01

    El estudio de comparación del tratamiento de aguas residuales domésticas utilizando sistemas naturales como los humedales artificiales presenta resultados de remoción de materia orgánica (DBO5) de entre 70 y 86% al utilizar el buchón de agua, y de 58% cuando se utiliza lenteja de agua. El sistema de humedales artificiales se comporta hidráulicamente como un modelo de flujo pistón, sin distinción del tipo de planta acuática que se use. Durante la experimentación se observó que cuando se utiliz...

  2. Advanced, Low/Zero Emission Boiler Design and Operation

    Energy Technology Data Exchange (ETDEWEB)

    Babcock/Wilcox; Illinois State Geological; Worley Parsons; Parsons Infrastructure/Technology Group

    2007-06-30

    In partnership with the U.S. Department of Energy's National Energy Technology Laboratory, B&W and Air Liquide are developing and optimizing the oxy-combustion process for retrofitting existing boilers as well as new plants. The main objectives of the project is to: (1) demonstrate the feasibility of the oxy-combustion technology with flue gas recycle in a 5-million Btu/hr coal-fired pilot boiler, (2) measure its performances in terms of emissions and boiler efficiency while selecting the right oxygen injection and flue gas recycle strategies, and (3) perform technical and economic feasibility studies for application of the technology in demonstration and commercial scale boilers. This document summarizes the work performed during the period of performance of the project (Oct 2002 to June 2007). Detailed technical results are reported in corresponding topical reports that are attached as an appendix to this report. Task 1 (Site Preparation) has been completed in 2003. The experimental pilot-scale O{sub 2}/CO{sub 2} combustion tests of Task 2 (experimental test performance) has been completed in Q2 2004. Process simulation and cost assessment of Task 3 (Techno-Economic Study) has been completed in Q1 2005. The topical report on Task 3 has been finalized and submitted to DOE in Q3 2005. The calculations of Task 4 (Retrofit Recommendation and Preliminary Design of a New Generation Boiler) has been completed in 2004. In Task 6 (engineering study on retrofit applications), the engineering study on 25MW{sub e} unit has been completed in Q2, 2008 along with the corresponding cost assessment. In Task 7 (evaluation of new oxy-fuel power plants concepts), based on the design basis document prepared in 2005, the design and cost estimate of the Air Separation Units, the boiler islands and the CO{sub 2} compression and trains have been completed, for both super and ultra-supercritical case study. Final report of Task-7 is published by DOE in Oct 2007.

  3. Electrostatic precipitator performance and trace element emissions from two Kraft recovery boilers.

    Science.gov (United States)

    Lind, Terttaliisa; Hokkinen, Jouni; Jokiniemi, Jorma K; Hillamo, Risto; Makkonen, Ulla; Raukola, Antti; Rintanen, Jaakko; Saviharju, Kari

    2006-01-15

    Fine particle emissions from combustion sources have gained attention recently due to their adverse effects on human health. The emission depends on the combustion process, fuel, and particulate removal technology. Particle concentrations at Kraft recovery boiler exits are very high, and the boilers are typically equipped with electrostatic precipitators (ESP). However, little data are available on the ESP performance in recovery boilers. Particle concentrations and size distributions were determined at two modern, operating recovery boilers. In addition, we determined the fractional collection efficiency of the ESPs by simultaneous measurements at the ESP inlet and outlet and the particulate emissions of trace metals. The particle mass concentration atthe ESP inlet was 11-24 g/Nm3 at the two boilers. Particle emissions were 30-40 mg/ Nm3 at boiler A and 12-15 mg/Nm3 at boiler B. The particle size distributions had a major particle mode at around 1 microm. These fume particles contained most of the particle mass. The main components in the particles were sodium and sulfate with minor amounts of chloride, potassium, and presumably some carbonate. The ESP collection efficiency was 99.6-99.8% at boiler A and 99.9% at boiler B. The particle penetration through the ESP was below 0.6% in the entire fume particle size range of 0.3-3 microm. Trace element emissions from both boilers were well below the limit values set by EU directive for waste incineration.

  4. Computer control for the Tampella double-grate boiler. Tampella-kaksoisarinan toiminnan ja arinapolton ohjaustutkimus

    Energy Technology Data Exchange (ETDEWEB)

    Imelaeinen, K; Petaenen, P; Koskela, O; Sutinen, R

    1986-01-01

    Most of the new boilers recently installed in Finland are multifuel boilers using woodwastes and peat as the main fuel. Although burning of woodwastes and peat is economically most attractive, noticeable difficulties are encountered in the combustion control due to such fuel characteristics as varying physical properties, moisture value etc. In this project a control strategy was developed for the Tampella double-grate boiler. Special attention was paid to the grate burning properties and the function of the mechanical grate. The control system consists of the optimization of the Tampella multifuel boiler (K10) and the steam levelling control system of the power plant. Because of the rapid load fluctuations caused by boarding machine web breaks or fluctuations in digester house steam demand, a steam network levelling system was installed in the power plant. The main object of the project was to minimize oil burning in the K10-boiler and the whole power plant and the optimization of grate burning. The practical results of the mechanical grate function control and air distribution optimization are very encouraging. During normal operation boiler pressure and excess oxygen are very stable compared with other grate boilers. The response time of boiler load changes is also very fast compared to other boilers of this type. The main object of the whole boiler installation project was to decrease oil consumption by effective burning of domestic fuels. This object was attained better than was predicted.

  5. Characteristics of particulate-bound polycyclic aromatic hydrocarbons emitted from industrial grade biomass boilers.

    Science.gov (United States)

    Yang, Xiaoyang; Geng, Chunmei; Sun, Xuesong; Yang, Wen; Wang, Xinhua; Chen, Jianhua

    2016-02-01

    Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic or mutagenic and are important toxic pollutants in the flue gas of boilers. Two industrial grade biomass boilers were selected to investigate the characteristics of particulate-bound PAHs: one biomass boiler retro-fitted from an oil boiler (BB1) and one specially designed (BB2) biomass boiler. One coal-fired boiler was also selected for comparison. By using a dilution tunnel system, particulate samples from boilers were collected and 10 PAH species were analyzed by gas chromatography-mass spectrometry (GC-MS). The total emission factors (EFs) of PAHs ranged from 0.0064 to 0.0380 mg/kg, with an average of 0.0225 mg/kg, for the biomass boiler emission samples. The total PAH EFs for the tested coal-fired boiler were 1.8 times lower than the average value of the biomass boilers. The PAH diagnostic ratios for wood pellets and straw pellets were similar. The ratio of indeno(1,2,3-cd)pyrene/[indeno(1,2,3-cd)pyrene+benzo(g,h,i)perylene] for the two biomass boilers was lower than those of the reference data for other burning devices, which can probably be used as an indicator to distinguish the emission of biomass boilers from that of industrial coal-fired boilers and residential stoves. The toxic potential of the emission from wood pellet burning was higher than that from straw pellet burning, however both of them were much lower than residential stove exhausts. Copyright © 2015. Published by Elsevier B.V.

  6. Emissions from three wood-fired domestic central heating boilers - heat load dependence

    International Nuclear Information System (INIS)

    Karlsson, M.L.

    1992-01-01

    The flue gases from three wood-fired domestic central heating boilers have been characterized. Measurements were made at three part loads; 3, 7 and 15 kW. Two of the boilers were modern multi-fuel boilers, with inverse firing and natural draught. The third boiler was a single-fuel wood boiler, with inverse firing and combustion air supply through a fan. All boilers were environmentally approved; the tar emissions were below 30 mg/MJ at nominal heat load. The following parameters were measured: - CO, CO 2 , NO x , total hydrocarbons (THC), - tar and particulates, - twelve volatile organic compounds (VOC). The limit value for tar emission was heavily exceeded for all three boilers at the part loads at which they were tested. For the two multi-fuel boilers the tar emissions decreased with increasing load level, while the opposite was found for the wood boiler with a fan. The NO x emissions varied between 20 and 120 mg/MJ. The multi-fuel boilers showed increasing NO x emissions with increasing heat load. The single-fuel wood boiler showed NO x emissions at about 60 mg/MJ, independent of load level. The CO and THC levels in general were high. The CO levels varied between 1000 and 2000 mg/MJ. While the THC levels varied between 300 and 4000 mg/MJ. Broadly speaking, the CO and THC levels decreased with increasing load levels for the multi-fuel boilers. For the single-fuel wood boiler the CO and THC levels were roughly the same at all load levels. Out of the twelve VOC compounds which were measured, the following could be detected and quantified. With FTIR analysis: Methane, ethylene, propene and acetylene. With GC analysis: Methanol, phenol and acetic acid. (1 ref., 31 figs., 7 tabs.)

  7. Novel partial-subsidence tower-type boiler design in an ultra-supercritical power plant

    International Nuclear Information System (INIS)

    Xu, Gang; Xu, Cheng; Yang, Yongping; Fang, Yaxiong; Zhou, Luyao; Zhang, Kai

    2014-01-01

    Highlights: • The two-pass type and tower-type boilers were compared. • A novel partial-subsidence tower-type boiler design was proposed. • Thermodynamic and economic analyses were quantitatively conducted. • The application of the partial-subsidence boiler to a 700 °C stage unit was further analyzed. - Abstract: An increasing number of tower-type boilers have been applied to ultra-supercritical power plants because of the simple design of the membrane walls and the smooth increase in temperature of such boilers. Nevertheless, the significant height and long steam pipelines of this boiler type will expand the power plant investment cost and increase steam-side pressure losses, especially for higher parameters units requiring high costs of nickel-based alloy materials. Thus, a novel partial-subsidence tower-type boiler design was proposed. In this boiler type, nearly 1/2–2/3 of the boiler height was embedded underground to reduce the height of the boiler and the length of the steam pipelines significantly. Thermodynamic and economic analyses were conducted on a state-of-the-art 1000 MW ultra-supercritical power plant and a prospective 700 °C-stage double reheat power plant. Results showed that the proposed tower-type boiler design could result in a 0.1% point increase in net efficiency and a $0.56/MW h reduction in the cost of electricity in a 1000 MW power plant. This economic benefit was enhanced for power plants with higher steam parameters and larger capacity. The concept of the proposed boiler design may provide a promising method for tower-type boiler applications, especially in new-generation double reheat plants with higher parameters

  8. 75 FR 21034 - Notice of Availability of Record of Decision for the Agua Fria National Monument and Bradshaw...

    Science.gov (United States)

    2010-04-22

    ....241A] Notice of Availability of Record of Decision for the Agua Fria National Monument and Bradshaw... availability of the Record of Decision (ROD)/Approved Resource Management Plan (RMP) for the Agua Fria National... of the planning area during prehistoric or historic times. The Agua Fria National Monument includes...

  9. Imulation of temperature field in swirl pulverized coal boiler

    Science.gov (United States)

    Lv, Wei; Wu, Weifeng; Chen, Chen; Chen, Weifeng; Qi, Guoli; Zhang, Songsong

    2018-02-01

    In order to achieve the goal of energy saving and emission reduction and energy efficient utilization, taking a 58MW swirl pulverized coal boiler as the research object, the three-dimensional model of the rotor is established. According to the principle of CFD, basic assumptions and boundary conditions are selected, the temperature field in the furnace of 6 kinds of working conditions is numerically solved, and the temperature distribution in the furnace is analyzed. The calculation results show that the temperature of the working condition 1 is in good agreement with the experimental data, and the error is less than 10%,the results provide a theoretical basis for the following calculation. Through the comparison of the results of the 6 conditions, it is found that the working condition 3 is the best operating condition of the pulverized coal boiler.

  10. Application of newly developed heat resistant materials for USC boilers

    International Nuclear Information System (INIS)

    Sato, T.; Tamura, K.; Fukuda, Y.; Matsuda, J.

    2004-01-01

    This paper describes the research on the development and improvement of new high strength heat resistant steels such as SUPER304H (18Cr-9Ni-3Cu-Nb-N), NF709 (20Cr-25Ni-1.5Mo-Nb-Ti-N) and HR3C (25Cr-20Ni-Nb-N) as boiler tube, and NF616 (9Cr-0.5Mo-1.8W-Nb-V) and HCM12A (11Cr-0.4Mo-2W-Nb-V-Cu) as thick section pipe. The latest manufacturing techniques applied for these steels are introduced. In addition the high temperature strength of Alloy617 (52Ni-22Cr-13Co-9Mo-Ti-Al) that is one of the candidate materials for the next generation 700 □ USC boilers is described. (orig.)

  11. INCREASING OF PRECISE ESTIMATION OF OPTIMAL CRITERIA BOILER FUNCTIONING

    Directory of Open Access Journals (Sweden)

    Y. M. Skakovsk

    2016-08-01

    Full Text Available Results of laboratory and industrial research allowed offering a way to improve the accuracy of estimation the optimal criterion of boilers' operation depending on fuel quality. Criterion is calculated continuously during boiler operation as heat ratio transmitted in production with superheated steam to the thermal energy obtained by combustion in boiler’s furnace fuel (natural gas .The non-linearity dependence of steam enthalpy from its temperature and pressure are considered when calculating, as well as changes in calorific value of natural gas, depending on variety in nitrogen content therein. The control algorithm and program for Ukrainian PLC MIC-52 are offered. The user selection program implements two searching modes for criterion maximum: automated and automatic. The results are going to be used for upgrading the existing control system on sugar factory.

  12. Boiler feedwater treatment using reverse osmosis at Suncor OSG

    International Nuclear Information System (INIS)

    Brown, T.

    1997-01-01

    The installation of a new 1000 cu m/hr reverse osmosis water treatment system for boiler feedwater at a Suncor plant was discussed. The selection process began in 1993 when Suncor identified a need to increase its boiler feedwater capacity. The company reviewed many options available to increase the treated water capacity. These included: contracting the supply of treated water, adding additional capacity, replacing the entire plant, reverse osmosis, and demineralization. The eventual decision was to build a new 1000 cu m/hr reverse osmosis water treatment plant with the following key components: a Degremont Infilco Ultra Pulsator Clarifier and a Glegg Water Conditioning multimedia filter, Amberpack softeners and reverse osmosis arrays. The reverse osmosis plant was environmentally favourable over an equivalent demineralization plant. A technical comparison was provided between demineralization and reverse osmosis. The system has proven to be successful and economical in meeting the plants needs. 5 figs

  13. Failure analyses and weld repair of boiler feed water pumps

    Energy Technology Data Exchange (ETDEWEB)

    Vulpen, R. van [KemaPower Generation, Arnhem (Netherlands)

    1998-12-31

    During a regular inspection of the Boiler Auxiliaries at one of the Dutch Electricity Production Companies serious cracks were found in the cover and casings of the feed water circulation pumps in two units after 108.000 and 122.000 hours of boiler operation. Kema Laboratories carried out Failure analyses on boat samples at the cracked areas. Corrosion fatigue cracking was found on the inner side of the GS-24CrNiMo325 casing. Shop Weld repairs were carried out using a newly developed mechanized Plasma Welding Technique. The repaired feed water circulation pumps showed no problems alter several years of operation. The costs of repair were substantially lower than the costs of replacement. (orig.) 3 refs.

  14. Thermal Effects by Firing Oil Shale Fuel in CFB Boilers

    Science.gov (United States)

    Neshumayev, D.; Ots, A.; Parve, T.; Pihu, T.; Plamus, K.; Prikk, A.

    It is well known that during firing of oil shale fuel the amount of heat released during its combustion per kg of fuel is significantly affected by the endothermic and exothermic processes taking place in mineral matter. These thermal effects are calcite and dolomite decomposing, marcasite FeS2 oxidising, CaO sulphation and formation of the new minerals. The given paper deals with the experimental study of the influence of these thermal effects of oil shale fuel having different heating value on total amount of heat released during combustion in calorimetric bomb, circulating fluidized bed (CFB) and pulverized-firing boiler (PFB). The large-scale (250 MWth) experiments were performed in the K11-1 CFB boiler of the Balti Power Plant. During experiments low heating value of a fuel varied within the range 8.5-11 MJ/kg. At the end some conclusions were drawn.

  15. Thermo hydraulics of a steam boiler forced circulation

    International Nuclear Information System (INIS)

    Tucakovic, Dragan; Zivanovic, Titoslav; Stevanovic, Vladimir

    2006-01-01

    In order to minimize the dryout at the steam boiler furnace in the Thermal Power Plant Kolubara B, designed are inner rifled wall tubes. This type of tubes, with many spiral grooves cut into the bore, prevents film boiling and enables the nucleate boiling be still maintained under the condition of vapour quality being app. 1. To verify the choice of the rifled tubes instead of the cheaper, smooth tubes type being justified, analyzed is the change of the actual and critical vapour quality with the furnace height, under uniform and non-uniform heat flu through evaporator walls. Furthermore, made are hydraulic calculations for various steam boiler loads, in case of both rifled and smooth tubes types, with the purpose to check the rifles influence to pressure drop increase in comparison with the smooth tubes. Also, checked is the selection of the circulation pump. Key words: evaporator, forced circulation, rifled tubes, critical vapour quality, pressure drop

  16. Bubbling fluidized bed boiler for Vanaja power plant

    Energy Technology Data Exchange (ETDEWEB)

    Sormunen, R.; Haermae, P.; Vessonen, K.; Ketomaeki, A. [ed.

    1998-07-01

    At the Vanaja Power Plant, on the outskirts of Haemeenlinna, there have been changes which reflect the central goals in IVO`s product development work. At Vanaja, efficiency is combined with environmental friendliness. In the early 1980s, the plant was modernized to produce district heat in addition to electricity. At that time, along with the new gas turbine at the plant, the main fuel, coal, while remaining the fuel for the old boilers, was replaced by natural gas. This year a new type of bubbling fluidized bed boiler enabling continuous use of peat and trial use of biofuels along with coal was introduced at the plant. In addition to the Nordic countries, this kind of technology is required in central eastern Europe, where modernization of ageing power plants is being planned to achieve the best possible solutions in respect of production and the environment. IVO develops a new repair technique for underwater sites

  17. Failure analyses and weld repair of boiler feed water pumps

    Energy Technology Data Exchange (ETDEWEB)

    Vulpen, R van [KemaPower Generation, Arnhem (Netherlands)

    1999-12-31

    During a regular inspection of the Boiler Auxiliaries at one of the Dutch Electricity Production Companies serious cracks were found in the cover and casings of the feed water circulation pumps in two units after 108.000 and 122.000 hours of boiler operation. Kema Laboratories carried out Failure analyses on boat samples at the cracked areas. Corrosion fatigue cracking was found on the inner side of the GS-24CrNiMo325 casing. Shop Weld repairs were carried out using a newly developed mechanized Plasma Welding Technique. The repaired feed water circulation pumps showed no problems alter several years of operation. The costs of repair were substantially lower than the costs of replacement. (orig.) 3 refs.

  18. Sulphur recirculation for reduced boiler corrosion; Minskad pannkorrosion med svavelrecirkulation

    Energy Technology Data Exchange (ETDEWEB)

    Andersson, Sven; Karlsson, Martin (Goetaverken Miljoe AB, Goeteborg (Sweden)); Blomqvist, Evalena; Baefver, Linda; Claesson, Frida; Davidsson, Kent (SP Sveriges Tekniska Forskningsinstitut, Boraas (Sweden)); Froitzheim, Jan; Pettersson, Jesper; Steenari, Britt-Marie (Chalmers Tekniska Hoegskola, Oorganisk miljoekemi, Goeteborg (Sweden))

    2010-03-15

    Sulphur recirculation is a new technology for reducing boiler corrosion and dioxin formation, which was demonstrated in full-scale tests performed at the Renova Waste to Energy plant at Saevenaes in Goeteborg (Sweden). Sulphur is recirculated from the flue gas cleaning back to the boiler, which reduces the chloride content of the deposits, which in turn reduces boiler corrosion and dioxin formation. Sulphur dioxide was separated from the flue gas in a wet scrubber by adding hydrogen peroxide, producing sulphuric acid. The sulphuric acid was injected into the furnace using nozzles with atomization air, surrounded by recirculated flue gas for improved mixing. By recirculating the sulphur, the sulphur dioxide concentration was increased in the boiler. Each sulphur atom passed the boiler several times and no external sulphur had to be added. Dioxin, ash, deposits and particle samplings together with 1000 h corrosion probe measurements were performed for normal operation (reference) and with sulphur recirculation respectively. During spring 2009, reference measurements were made and the recirculation system was installed and tested. During autumn 2009, a long term test with sulphur recirculation was made. An SO{sub 2} concentration of approximately 800 mg/m3 (n, d.g.) was maintained in the boiler by the system except during a period of extremely low sulphur content in the waste. The sulphur dioxide stack concentrations have been far below the emission limit. Sulphuric acid dew point measurements have shown that the sulphuric acid dosage did not lead to elevated SO{sub 3} concentrations, which may otherwise lead to low temperature corrosion. The chlorine content of both fly ash and boiler ash decreased and the sulphur content increased during the sulphur recirculation tests. The molar chlorine/sulphur ratio (Cl/S) decreased by two thirds in the fly ash as well as in the boiler ash, except for one sample. With sulphur recirculation in operation, the deposit growth was

  19. Simulation of pulverized coal fired boiler: reaction chamber

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, C.P.; Lansarin, M.A.; Secchi, A.R.; Mendes, T.F. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Dept. de Engenharia Quimica. Grupo de Modelagem, Simulacao, Controle e Otimizacao de Processos)]. E-mail: {cperdomo, marla, arge, talita}@enq.ufrgs.br

    2005-06-15

    This work is part of a joint project to built a computational tool for power plant simulation, dealing specifically with the reaction chamber (place of the boiler where the fuel is burned). In order to describe the conversion of chemical energy to thermal energy, an one dimensional pseudo-homogeneous mathematical model, with variable physical properties, and based on mass and energy balances, was developed. The equations were implemented in the gPROMS simulator and the model parameters were estimated using the module gEST of this software, with experimental data from a large-scale coal-fired utility boiler and kinetic data from the open literature. The results showed that the model predicts the composition of the outlet combustion gas satisfactorily. (author)

  20. Aspects of high temperature corrosion of boiler tubes

    Energy Technology Data Exchange (ETDEWEB)

    Spiegel, M.; Bendick, W. [Salzgitter-Mannesmann-Forschung GmbH, Duisburg (Germany)

    2008-07-01

    The development of new boiler steels for power generation has to consider significant creep strength as well as oxidation and corrosion resistance. High temperature corrosion of boiler materials concerns steam oxidation as well as fireside corrosion of parts, in contact with the flue gas. It will be shown that depending on the quality of the fuel, especially chlorine and sulphur are responsible for most of the fireside corrosion problems. Corrosion mechanisms will be presented for flue gas induced corrosion (HCl) and deposit induced corrosion (chlorides and sulfates). Especially for the 700 C technology, deposit induced corrosion issues have to be considered and the mechanisms of corrosion by molten sulfates 'Hot Corrosion' will be explained. Finally, an overview will be given on the selection of suitable materials in order to minimise corrosion relates failures. (orig.)

  1. Failure analysis of the boiler water-wall tube

    Directory of Open Access Journals (Sweden)

    S.W. Liu

    2017-10-01

    Full Text Available Failure analysis of the boiler water-wall tube is presented in this work. In order to examine the causes of failure, various techniques including visual inspection, chemical analysis, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy were carried out. Tube wall thickness measurements were performed on the ruptured tube. The fire-facing side of the tube was observed to have experienced significant wall thinning. The composition of the matrix material of the tube meets the requirements of the relevant standards. Microscopic examinations showed that the spheroidization of pearlite is not very obvious. The failure mechanism is identified as a result of the significant localized wall thinning of the boiler water-wall tube due to oxidation.

  2. METHANE de-NOX FOR UTILITY PC BOILERS

    Energy Technology Data Exchange (ETDEWEB)

    Joseph Rabovitser

    2000-07-05

    The overall project objective is the development and validation of an innovative combustion system, based on a novel coal preheating concept prior to combustion, that can reduce NO{sub x} emissions to 0.15 lb/million Btu or less on utility pulverized coal (PC) boilers. This NO{sub x} reduction should be achieved without loss of boiler efficiency or operating stability, and at more than 25% lower levelized cost than state-of-the-art SCR technology. A further objective is to make this technology ready for full-scale commercial deployment by 2002-2003 in order to meet an anticipated market demand for NO{sub x} reduction technologies resulting from the EPA's NO{sub x} SIP call.

  3. Protocolo nacional de monitoreo de la calidad de los en cuerpos naturales de agua superficial

    OpenAIRE

    Autoridad Nacional del Agua. Dirección de Gestión de Calidad de los Recursos Hídricos

    2011-01-01

    Estandariza la metodología para el desarrollo del monitoreo de la calidad de los recursos hídricos en los cuerpos naturales de agua superficial, asimismo pretende convertirse en un instrumento de gestión en el desarrollo del Plan Nacional de Vigilancia de la Calidad de Agua en el Perú.

  4. 25 CFR 115.106 - Assets of members of the Agua Caliente Band of Mission Indians.

    Science.gov (United States)

    2010-04-01

    ... 25 Indians 1 2010-04-01 2010-04-01 false Assets of members of the Agua Caliente Band of Mission Indians. 115.106 Section 115.106 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR FINANCIAL ACTIVITIES TRUST FUNDS FOR TRIBES AND INDIVIDUAL INDIANS IIM Accounts § 115.106 Assets of members of the Agua...

  5. Regulation of the alpha-glucuronidase-encoding gene (aguA) from Aspergillus niger

    NARCIS (Netherlands)

    Vries, de R.P.; Vondervoort, van de P.J.I.; Hendriks, L.; Belt, van de M.; Visser, J.

    2002-01-01

    The !-glucuronidase gene aguA from Aspergillus niger was cloned and characterised. Analysis of the promoter region of aguA revealed the presence of four putative binding sites for the major carbon catabolite repressor protein CREA and one putative binding site for the transcriptional activator XLNR.

  6. Stepwise commissioning of a steam boiler with stability guarantees

    DEFF Research Database (Denmark)

    Johansen, Simon Vestergaard; Kallesøe, Carsten Skovmose; Bendtsen, Jan Dimon

    2016-01-01

    This paper aims to make the commissioning of an industrial MIMO controller more straightforward by gradually commissioning it from a set of SISO controllers, after the system has been started. For this purpose a stepwise commissioning strategy based on the Youla-Kucera parametrization has been de...... been commissioned from a SISO controller using the developed method on a real steam boiler and measurements show a clear performance improvement after transition....

  7. Research on Marine Boiler's Pressurized Combustion and Heat Transfer

    Institute of Scientific and Technical Information of China (English)

    Pingjian MING; Renqiu JIANG; Yanjun LI; Baozhi SUN

    2005-01-01

    The effect of pressure on combustion and heat transfer is analyzed. The research is based on the basic combustion and heat transfer theorem. A correction for the heat calculation method for pressurized furnace is made on the basis of the normal pressure case. The correction takes the effect of pressurizing into account. The results show that the correction is reasonable and the method is applicable to combustion and heat transfer of the marine supercharged boiler.

  8. Specific Emissions of Harmful Substances from Small Boilers

    Directory of Open Access Journals (Sweden)

    Horák Jiøí

    1998-09-01

    Full Text Available Coal is on of the most important energy source and its significance will increase in a future. In Czech republic coal is except else widely used as a fuel for combustion in a small boilers (up to 50 kW. Low efficiency of the small boilers which is often below 50% together with high emissions of the harmful substances into near surroundings cause in average 40 – 70% of total local air pollution. The research was performed in a scope of the Grant no. 101/98/0820 of Grant Agency of Czech Republic was focused on quality of combustion process related to combustion efficiency and creation of harmful substances at combustion of domestic fuels. Experiments were performed to compare combustion of brown coal, clack coal, coke and black coal slurry. Extremely high creation of harmful substances (CO, NOX, solid particles and organic substances was measured when the black coal slurry was used as a fuel, measured in kg of emissions per GJ of burned fuel. Combustion of brown coal produced significant emissions of solid particles which bond harmful substances as metals, polyaromatic hydrocarbons and others together with high emissions of SO2 . Strong dependence between emissions of CO and low quality of combustion given by low combustion temperature, shortage of combustion air, not suitable design of after-combustion chamber and short duration of fuel presence in a combustion area was found out. Emissions of wide range of metals were investigated. The results of the research grant project describe and explain the combustion process and creation of harmful substances in small boilers plus give suggestions and recommendations leading to rational operation of the small boilers and lowering their negative impact to environment.

  9. EMISSIONS CHARACTERISTICS OF A RESIDENTIAL PELLET BOILER AND A STOVE

    OpenAIRE

    Win, Kaung Myat; Persson, Tomas

    2010-01-01

    Gaseous and particulate emissions from a residential pellet boiler and a stove are measured at a realistic 6-day operation sequence and during steady state operation. The aim is to characterize the emissions during each phase in order to identify when the major part of the emissions occur to enable actions for emission reduction where the savings can be highest. The characterized emissions comprised carbon monoxide (CO), nitrogen oxide (NO), total organic carbon (TOC) and particulate matter (...

  10. A review on biomass as a fuel for boilers

    Energy Technology Data Exchange (ETDEWEB)

    Saidur, R.; Abelaziz, E.A.; Demirbas, A.; Hossain, M.S.; Mekhilef, S. [University of Malaya, Kuala Lumpur (Malaysia). Dept. of Mechanical Engineering

    2011-06-15

    Currently, fossil fuels such as oil, coal and natural gas represent the prime energy sources in the world. However, it is anticipated that these sources of energy will deplete within the next 40-50 years. Moreover, the expected environmental damages such as the global warming, acid rain and urban smog due to the production of emissions from these sources have tempted the world to try to reduce carbon emissions by 80% and shift towards utilizing a variety of renewable energy resources (RES) which are less environmentally harmful such as solar, wind, biomass etc. in a sustainable way. Biomass is one of the earliest sources of energy with very specific properties. In this review, several aspects which are associated with burning biomass in boilers have been investigated such as composition of biomass, estimating the higher heating value of biomass, comparison between biomass and other fuels, combustion of biomass, co-firing of biomass and coal, impacts of biomass, economic and social analysis of biomass, transportation of biomass, densification of biomass, problems of biomass and future of biomass. It has been found that utilizing biomass in boilers offers many economical, social and environmental benefits such as financial net saving, conservation of fossil fuel resources, job opportunities creation and CO{sub 2} and NO emissions reduction. However, care should be taken to other environmental impacts of biomass such as land and water resources, soil erosion, loss of biodiversity and deforestation. Fouling, marketing, low heating value, storage and collections and handling are all associated problems when burning biomass in boilers. The future of biomass in boilers depends upon the development of the markets for fossil fuels and on policy decisions regarding the biomass market.

  11. CAD And Distributed Manufacturing Solutions for Pellet Boiler Producers

    Directory of Open Access Journals (Sweden)

    Timur Mamut

    2016-12-01

    Full Text Available The paper is summarizing the research activities that had been carried out for defining an appropriate manufacturing concept and the system architecture for a manufacturing plant of pellet boilers. The concept has been validated through the implementation of a solution of computer integrated manufacturing that includes a CAD platform and a CAM facility including laser cutting machines, rolling and welding machines and advanced technologies for assembly, quality control and testing.

  12. Simulasi Thermal Stress Pada Tube Superheater Package Boiler

    OpenAIRE

    Hamdani

    2013-01-01

    This project investigates the thermal stress behavior and the mechanisms of superheater tube failure with experimental method and numerical analysis. First of all the procedures for failure analysis were applied to determine the root cause of them. A visual assessment of boiler critical pressure parts was carried out, and then the failed tube is examined by nondestructive evaluation. For the numerical domain, initially the elastic solution for a superheater tube subjected to an internal press...

  13. Failure analysis of the boiler water-wall tube

    OpenAIRE

    S.W. Liu; W.Z. Wang; C.J. Liu

    2017-01-01

    Failure analysis of the boiler water-wall tube is presented in this work. In order to examine the causes of failure, various techniques including visual inspection, chemical analysis, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy were carried out. Tube wall thickness measurements were performed on the ruptured tube. The fire-facing side of the tube was observed to have experienced significant wall thinning. The composition of the matrix material of the tu...

  14. LOCALIZACIÓN Y AFECTACIÓN DE COSTES MEDIOAMBIENTALES Y NO MEDIOAMBIENTALES EN LAS EMPRESAS DE AGUAS: EL COSTE DEL AGUA DESALADA

    Directory of Open Access Journals (Sweden)

    Jerónimo Pérez Alemán

    2005-12-01

    Full Text Available La Directiva 2000/60/EC del Parlamento Europeo y del Consejo establece un marco de acción comunitaria en el ámbito de la política de aguas. Esta norma indica, en su artículo 9, que los miembros de los Estados tendrán en cuenta el principio de recuperación de los costes de los servicios de aguas, incluidos los medioambientales. Así pues, las empresas de tratamiento y abastecimiento urbano de aguas tienen la necesidad de generar información sobre los costes en general, y sobre los costes (y otras magnitudes medioambientales en particular. En el presente trabajo centramos nuestra atención en el coste de uno de los outputs de tales empresas: el agua desalada.

  15. Administración del agua. - Capítulo I: Marco jurídico conceptual de la gestión del agua.

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  16. Administración del agua. - Capítulo IV: Los usuarios y la gestión del agua

    OpenAIRE

    Fernández Morales, Juan Carlos

    2008-01-01

    ÍNDICE Créditos Dedicatoria Agradecimiento Notas del autor Introducción Capítulo I: Marco jurídico conceptual de la gestión del agua. Capítulo II: Organización administrativa del agua. Capítulo III: Las confederaciones hidrográficas en la legislación española. Capítulo IV: Los usuarios y la gestión del agua. Capítulo V: Administración del agua y competencias sectoriales en las comunidades autonómas españolas. Capítulo VI: Abastecimien...

  17. Efficiency assessment of bi-radiated screens and improved convective set of tubes during the modernization of PTVM-100 tower hot-water boiler based on controlled all-mode mathematic models of boilers on Boiler Designer software

    Science.gov (United States)

    Orumbayev, R. K.; Kibarin, A. A.; Khodanova, T. V.; Korobkov, M. S.

    2018-03-01

    This work contains analysis of technical values of tower hot-water boiler PTVM-100 when operating on gas and oil residual. After the test it became clear that due to the construction deficiency during the combustion of oil residual, it is not possible to provide long-term production of heat. There is also given a short review on modernization of PTVM-100 hot-water boilers. With the help of calculations based on controlled all-mode mathematic modules of hot-water boilers in BOILER DESIGNER software, it was shown that boiler modernization by use of bi-radiated screens and new convective set of tubes allows decreasing sufficiently the temperature of combustor output gases and increase reliability of boiler operation. Constructive changes of boiler unit suggested by authors of this work, along with increase of boiler’s operation reliability also allow to improve it’s heat production rates and efficiency rate up to 90,5% when operating on fuel oil and outdoor installation option.

  18. Thermal design of horizontal tube boilers: numerical and experimental investigation

    International Nuclear Information System (INIS)

    Roser, Robert

    1999-01-01

    This work concerns the thermal design of kettle re-boilers. Current methods are highly inaccurate, regarded to the correlations for external heat transfer coefficient at one tube scale, as well as to two-phase flow modelling at boiler scale. The aim of this work is to improve these thermal design methods. It contains an experimental investigation with typical operating conditions of such equipment: an hydrocarbon (n-pentane) with low mass flux. This investigation has lead to characterize the local flow pattern through void fraction measurements and, from this, to develop correlations for void fraction, pressure drop and heat transfer coefficient. The approach is original, since the developed correlations are based on the liquid velocity at minimum cross section area between tubes, as variable characterizing the hydrodynamic effects on pressure drop and heat transfer coefficient. These correlations are shown to give much better results than those suggested up to now in the literature, which are empirical transpositions from methods developed for inside tube flows. Furthermore, the numerical code MC3D has been applied using the correlations developed in this work, leading to a modelization of the two-phase flow in the boiler, which is a significant progress compared to current simplified methods. (author) [fr

  19. Influence of boiler load on water tubes burnout

    Energy Technology Data Exchange (ETDEWEB)

    Said, S.A.M.; Habib, M.A.; Badr, H.M.; Mansour, R. [King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia). Dept. of Mechanical Engineering

    2009-07-01

    The influence of boiler loads on water tube burnout was investigated. The in-service boiler had 2 burners at different levels located in the front of the burner's wall. Homogenous-flow and separated-flow models were designed to simulate the water circulation and combustion processes inside the boiler tubes. Heat flux calculations were derived by solving the conservation of mass, momentum, and energy equations and species concentration as well as by solving turbulence, reaction rate, and radiation model equations. Results of the study showed that heat flux during full loads ranged from close to 0 to 270 kW/m2. The right side screen wall of the burner exhibited higher heat flux values in the middle region of the wall where large areas were subjected to heat flux close to a maximum of 270 kW/m2. Results also included reductions in heat flux values at partial loads. Maximum values were reduced from 270 kW/m2 ato 230 kW/m2 at 75 per cent capacity and 200 kW/m2 at 60 per cent capacity. The rate of steam generation increased from 0.1 kg/s to 0.153 kg/s when the distance from the burner wall increased from 2 meters to 12 meters. 10 refs., 10 figs.

  20. CEGB research on boiler leaks and their detection in service

    International Nuclear Information System (INIS)

    Hayes, D.J.

    1978-01-01

    The penalty in loss of output to an electricity generation organisation as a consequence of failure to deal effectively with small LMFBR boiler leaks would be large. There is therefore a considerable incentive for these organisations to satisfy themselves that proper provisions are made to ensure that both the incidence and the severity of boiler leaks are minimised. In the UK, responsibility for the research, development and design work for this and indeed for most aspects of future nuclear power plant rests with the UKAEA and NPC; nevertheless as a consequence of its 'informed operator' policy the Central Electricity Generating Board has devoted some research effort to this field in recent years. o date, research work has been put in hand with the objective of achieving an understanding of the basic behaviour of boiler leaks. In addition, attention has been given to leak detection by monitoring the sodium for increases in oxygen and hydrogen levels. In both cases leaks into liquid sodium rather than into the gas space have been considered. In the course of the work hydrogen and oxygen meters based on the galvanic cell principle have been constructed and evaluated. The former is a new device which is comparable in performance with hydrogen meters based on the ion pump. The present state of the work is briefly described in this paper

  1. Fire-side corrosion in power-station boilers

    Energy Technology Data Exchange (ETDEWEB)

    Cutler, A J.B.; Flatley, T; Hay, K A

    1978-10-01

    The steel tubing of a modern power-station boiler operates at up to 650/sup 0/C (a dull red heat) in the very corrosive environment produced by the combustion gases and ash particles. Within the tubes, whose walls are around 5mm thick, 2000 tons of steam are generated per hour at temperatures up to 565/sup 0/C and pressures up to 170 bar. Several forms of metal corrosion may occur on the fireside surface of these tubes and on other boiler components. The designed 20-year operating life of the stainless-steel superheater and reheater tubes can be much reduced at temperatures above 600/sup 0/C by attack from molten salts formed beneath the deposited ash on the upstream tube surfaces. Mild steel evaporator tubes lining the furnace wall may suffer similarly if flame impingement allows the local release of volatile chlorine compounds from coal particles on the tube surface. Uncooled metal components supporting and aligning the boiler tubes may reach 1000/sup 0/C and are particularly susceptible to corrosion. CEGB research effort has been applied to quantify the rate of corrosion and to obtain an understanding of the complex corrosion mechanisms, so that ways of minimizing or preventing their occurrence may be found. These include the optimization of the combustion chemistry, design modifications such as shielding certain vulnerable tubes, and the selection of improved alloys and the use of ''co-extruded'' tubing.

  2. Two phase flow problems in power station boilers

    International Nuclear Information System (INIS)

    Firman, E.C.

    1974-01-01

    The paper outlines some of the waterside thermal and hydrodynamic phenomena relating to design and operation of large boilers in central power stations. The associated programme of work is described with an outline of some results already obtained. By way of introduction, the principal features of conventional and nuclear drum boilers and once-through nuclear heat exchangers are described in so far as they pertain to this area of work. This is followed by discussion of the relevant physical phenomena and problems which arise. For example, the problem of steam entrainment from the drum into the tubes connecting it to the furnace wall tubes is related to its effects on circulation and possible mechanisms of tube failure. Other problems concern the transient associated with start-up or low load operation of plant. The requirement for improved mathematical representation of steady and dynamic performance is mentioned together with the corresponding need for data on heat transfer, pressure loss, hydrodynamic stability, consequences of deposits, etc. The paper concludes with reference to the work being carried out within the C.E.G.B. in relation to the above problems. The facilities employed and the specific studies being made on them are described: these range from field trials on operational boilers to small scale laboratory investigations of underlying two phase flow mechanisms and include high pressure water rigs and a freon rig for simulation studies

  3. CEGB research on boiler leaks and their detection in service

    Energy Technology Data Exchange (ETDEWEB)

    Hayes, D J [Berkeley Nuclear Laboratories, Berkeley, Gloucestershire (United Kingdom)

    1978-10-01

    The penalty in loss of output to an electricity generation organisation as a consequence of failure to deal effectively with small LMFBR boiler leaks would be large. There is therefore a considerable incentive for these organisations to satisfy themselves that proper provisions are made to ensure that both the incidence and the severity of boiler leaks are minimised. In the UK, responsibility for the research, development and design work for this and indeed for most aspects of future nuclear power plant rests with the UKAEA and NPC; nevertheless as a consequence of its 'informed operator' policy the Central Electricity Generating Board has devoted some research effort to this field in recent years. o date, research work has been put in hand with the objective of achieving an understanding of the basic behaviour of boiler leaks. In addition, attention has been given to leak detection by monitoring the sodium for increases in oxygen and hydrogen levels. In both cases leaks into liquid sodium rather than into the gas space have been considered. In the course of the work hydrogen and oxygen meters based on the galvanic cell principle have been constructed and evaluated. The former is a new device which is comparable in performance with hydrogen meters based on the ion pump. The present state of the work is briefly described in this paper.

  4. Boiler: lossy compression of RNA-seq alignments using coverage vectors.

    Science.gov (United States)

    Pritt, Jacob; Langmead, Ben

    2016-09-19

    We describe Boiler, a new software tool for compressing and querying large collections of RNA-seq alignments. Boiler discards most per-read data, keeping only a genomic coverage vector plus a few empirical distributions summarizing the alignments. Since most per-read data is discarded, storage footprint is often much smaller than that achieved by other compression tools. Despite this, the most relevant per-read data can be recovered; we show that Boiler compression has only a slight negative impact on results given by downstream tools for isoform assembly and quantification. Boiler also allows the user to pose fast and useful queries without decompressing the entire file. Boiler is free open source software available from github.com/jpritt/boiler. © The Author(s) 2016. Published by Oxford University Press on behalf of Nucleic Acids Research.

  5. La fundamentalidad del derecho al agua en Colombia

    Directory of Open Access Journals (Sweden)

    Mies Sutorius

    2015-12-01

    Full Text Available El agua es un recurso natural finito de vital importancia para el ser humano, lo que explica que con el paso del tiempo se busque con mayor fuerza su protección, no solo en el ámbito internacional sino también en el orden jurídico interno. De ahí el interés en realizar una revisión normativa y especialmente jurisprudencial que permita evidenciar la evolución del derecho al agua, los matices y las diversas formas de protección del mismo, profundizando en su dimensión personal. La Constitución Política colombiana omite enunciar el derecho al agua como derecho individual, razón por la cual se procede a estudiar la jurisprudencia constitucional, seleccionándose algunas sentencias en donde existen sujetos de especial protección, en tanto al reconocerse a estos la vulneración y garantía de derechos se prevé la protección de los derechos del resto de la población; así como algunos casos en donde existen condiciones particulares, a partir de la suspensión del servicio por falta de pago a la empresa encargada del suministro, conexión fraudulenta y reconexión ilegal; para concluir que se han presentado dos tendencias en el amparo de este derecho, que ha pasado de ser protegido por vía de la “teoría de la conexidad” a ser catalogado como fundamental con una tutela restringida a la cantidad mínima necesaria para sobrevivir.

  6. Declaración y financiación de obras hidráulicas de interés general, mercado del agua, aguas subterráneas, planificación hidrológica

    OpenAIRE

    Llamas, M. R.

    1997-01-01

    En mayo de 1997 el Ministerio de Medio Ambiente difundió un borrador de Reforma de la Ley de Aguas española de 1985. Esta actuación se enmarcó dentro de la política de transparencia informativa y búsqueda de consenso social en los temas conflictivos de la política del agua en España. El autor propone que esa propuesta de Reforma sea retirada pues, aunque trata algunos temas interesantes como la reutilización de agua, la desalación de aguas de mar y el mercado del agua, no aborda los temas rea...

  7. Consideraciones sobre la valoración social del agua

    Directory of Open Access Journals (Sweden)

    Robert Hérin

    2003-01-01

    Full Text Available Las características del clima mediterráneo y el intenso aprovechamiento de los recursos hídricos en este ámbito, son los causantes de la excepcional importancia que se atribuye al agua en la cultura y la configuración de los paisajes. En este artículo se realiza un análisis de la evolución que ha seguido, sobre todo en los últimos siglos, el agro mediterráneo, desde las huertas tradicionales y los paisajes de secano a las nuevas formas de aprovechamiento agrícola, desde una perspectiva social.

  8. Recuperación de aguas naturales contaminadas utilizando quitosano

    OpenAIRE

    Rincón, Dianela Isabel; Rincón, Marinela Colina; Molina Zerpa, José Alejandro; Vargas Colina, José Alejandro; Montilla, Brinolfo

    2017-01-01

    RESUMEN En la actualidad, existen innumerables tratamientos de coagulación / floculación para aguas de los cuales los compuestos tradicionalmente utilizados están vinculados con enfermedades a los seres vivos; por tal motivo, se busca emplear compuestos amigables con el ambiente, no tóxicos y de alta eficiencia. El quitosano es un polímero biodegradable, no tóxico con propiedades coagulantes y floculantes; mientras que, el metabisulfito de sodio tiene la capacidad de reducir la toxicidad d...

  9. Del Charco del Agua Amarga (Alcañiz

    Directory of Open Access Journals (Sweden)

    Tomás MAIGI

    2009-10-01

    Full Text Available En agosto de 1947, habiendo llegado a la excelentísima Diputación Provincial de Teruel rumores de recientes deterioros en el friso pintado del abrigo rupestre del "Charco del Agua Amarga", nos fué requerida oficialmente, por dicha Corporación, la presentación de un informe sobre la realidad de los hechos expuestos, así como el planeamiento de las medidas adecuadas para salvaguardar en forma eficaz, en el futuro, las referidas pinturas.

  10. Editorial of the 30th issue of Ambiente & Agua journal

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2015-07-01

    Full Text Available This editorial discusses the Ambiente & Agua journal’s efforts to adjust to new criteria in order to remain in the SciELO Brazil collection. Special emphasis is given to efforts intended to meet the anticipated levels of internationalization, professionalization, and sustainable funding models in order to maintain the journal’s high quality and increasing impact. The Editorial Board identified the need to raise publication fees beginning on July 15, 2015. However, since we have a hybrid approach that includes public support and publication fees to cover article processing charges (APC, the new rates will be much lower than the average international APC.

  11. MICROCONTAMINANTES EMERGENTES EN AGUAS: TIPOS Y SISTEMAS DE TRATAMIENTO

    OpenAIRE

    Yolanda Patiño; Eva Díaz; Salvador Ordóñez

    2014-01-01

    En el presente artículo se revisan las distintas clases de contaminantes emergentes, su origen y uso, y su presencia en las cuencas españolas, tanto en aguas superficiales como subterráneas. Los microcontaminantes emergentes son compuestos de distinto origen y naturaleza que hasta ahora habían pasado inadvertidos debido a su baja concentración (en el orden de las ppb) y sobre los que no hay regulación específica. Están divididos en seis grandes grupos y muchos de ellos se comportan como disru...

  12. Control de ph para planta de tratamiento de aguas residuales

    Directory of Open Access Journals (Sweden)

    Wilson Fabián Amaya

    2004-01-01

    Full Text Available En este trabajo se presenta el problema de controlar el pH en una planta de tratamiento de aguas residuales (PTAR, la cual recibe soluciones ácidas provenientes de la producción de jugos (pH 2-5 que se dosifica con la sustancia usada para aseo (soda cáustica 0.04% con valores oscilatorios de pH 9-11. Se desarrolló e implementó un controlador clásico PI en un PLC comercial y se automatiza la PTAR mostrando el resultado obtenido en simulación en MatLAB.

  13. Control de ph para planta de tratamiento de aguas residuales

    OpenAIRE

    Wilson Fabián Amaya; Óscar Alberto Cañón; Óscar F. Avilés

    2004-01-01

    En este trabajo se presenta el problema de controlar el pH en una planta de tratamiento de aguas residuales (PTAR), la cual recibe soluciones ácidas provenientes de la producción de jugos (pH 2-5) que se dosifica con la sustancia usada para aseo (soda cáustica 0.04%) con valores oscilatorios de pH 9-11. Se desarrolló e implementó un controlador clásico PI en un PLC comercial y se automatiza la PTAR mostrando el resultado obtenido en simulación en MatLAB.

  14. Filtros cerámicos, una alternativa de agua segura

    OpenAIRE

    Lerma Arias, Daniel Alberto

    2012-01-01

    Ante las bajas coberturas de acueducto y alcantarillado en la zona rural de Colombia y los altos costos de implementación de sistemas de potabilización y distribución convencionales es importante evaluar la viabilidad técnica y económica de sistemas alternativos de tratamiento de agua potable al alcance de comunidades rurales y de bajos recursos; por tanto se analiza una tecnología alternativa que aun no ha sido probada en Colombia como son los filtros cerámicos impregnados con plata coloidal...

  15. Mass spectra features of biomass burning boiler and coal burning boiler emitted particles by single particle aerosol mass spectrometer.

    Science.gov (United States)

    Xu, Jiao; Li, Mei; Shi, Guoliang; Wang, Haiting; Ma, Xian; Wu, Jianhui; Shi, Xurong; Feng, Yinchang

    2017-11-15

    In this study, single particle mass spectra signatures of both coal burning boiler and biomass burning boiler emitted particles were studied. Particle samples were suspended in clean Resuspension Chamber, and analyzed by ELPI and SPAMS simultaneously. The size distribution of BBB (biomass burning boiler sample) and CBB (coal burning boiler sample) are different, as BBB peaks at smaller size, and CBB peaks at larger size. Mass spectra signatures of two samples were studied by analyzing the average mass spectrum of each particle cluster extracted by ART-2a in different size ranges. In conclusion, BBB sample mostly consists of OC and EC containing particles, and a small fraction of K-rich particles in the size range of 0.2-0.5μm. In 0.5-1.0μm, BBB sample consists of EC, OC, K-rich and Al_Silicate containing particles; CBB sample consists of EC, ECOC containing particles, while Al_Silicate (including Al_Ca_Ti_Silicate, Al_Ti_Silicate, Al_Silicate) containing particles got higher fractions as size increase. The similarity of single particle mass spectrum signatures between two samples were studied by analyzing the dot product, results indicated that part of the single particle mass spectra of two samples in the same size range are similar, which bring challenge to the future source apportionment activity by using single particle aerosol mass spectrometer. Results of this study will provide physicochemical information of important sources which contribute to particle pollution, and will support source apportionment activities. Copyright © 2017. Published by Elsevier B.V.

  16. Optimal Switching Control of Burner Setting for a Compact Marine Boiler Design

    DEFF Research Database (Denmark)

    Solberg, Brian; Andersen, Palle; Maciejowski, Jan M.

    2010-01-01

    This paper discusses optimal control strategies for switching between different burner modes in a novel compact  marine boiler design. The ideal behaviour is defined in a performance index the minimisation of which defines an ideal trade-off between deviations in boiler pressure and water level...... approach is based on a generalisation of hysteresis control. The strategies are verified on a simulation model of the compact marine boiler for control of low/high burner load switches.  ...

  17. Analisa Efisiensi Water Tube Boiler Berbahan Bakar Fiber, Cangkang Sawit dan Kulit Kayu Menggunakan Metode Langsung

    OpenAIRE

    Gaol, Dosma Putra Lumban

    2016-01-01

    Some of the factors that affect the efficiency of the boiler is a superheater pressure, water feed temperature, steam temperature, the amount of steam produced, the amount of fuel consumption and calorific value fuel combustion. Steamtab chemicallogic use companion software to calculate the value of enthalpy. The aim of this study is to get relations variations in pressure superheater with boiler efficiency, the relationship of variation of temperature feed water to the boiler efficiency, the...

  18. STUDY ON INFLUENCE OF ENERGY EFFICIENCY OF A STEAM BOILER BENSON ON ENVIRONMENTAL POLLUTION

    Directory of Open Access Journals (Sweden)

    Racoceanu Cristinel

    2016-12-01

    Full Text Available This paper presents a case study on the influence of the energy efficiency of a steam boiler of 330 MW energy group on the environment. The Benson boiler works with powdered lignite. We present the results of experimental measurements on immission and emissions of pollutants resulting from burning lignite: SO2, NOx, PM10, PM2,5, TSP. Experimental measurements were performed on the boilers of 330MW power units of the thermoelectric plant of Rovinari.

  19. Kajian Efisiensi Termal Dari Boiler Di Pembangkit Listrik Tenaga Uap Amurang Unit 1

    OpenAIRE

    Kurniawan, Hanzen Yauri; Gunawan, Hardi; Maluegha, Benny

    2015-01-01

    Indonesia has a considerably high potential resources that can be harnessed to generate electricity through power plants. At Amurang Steam Power Plant (PLTU Amurang), coal is used for the fuel and boiler is the equipment to burn the coal producing heat. Boiler is one of the equipments in the thermodynamics cycle which aims to turn the water into steam. This study was conducted to determine the thermal efficiency of the boiler in PLTU Amurang Unit 1 based on operational data. The data collecte...

  20. Emissions Characterisation of residential pellet boilers during start-up and stop periods

    OpenAIRE

    Win, Kaung Myat; Paavilainen, Janne; Persson, Tomas

    2010-01-01

    In this study, gaseous emissions and particles are measured during start-up and stop periods for an over-fed boiler and an under-fed boiler. Both gaseous and particulate matter emissions are continuously measured in the laboratory. The measurement of gaseous emissions includes oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxide and (NO). The emissions rates are calculated from measured emissions concentrations and flue gas flow. The behaviours of the boilers during start-u...