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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. 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

  3. 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.

  4. Balance Hidrofílico-Lipofílico (HLB) del colesterol y sus aplicaciones en emulsiones del tipo aceite en agua

    OpenAIRE

    Pasquali, Ricardo C.; Bregni, Carlos

    2006-01-01

    El colesterol está propuesto como emulsionante en cosméticos y formulaciones farmacéuticas de aplicación tópica, la mayor parte de las cuales son anhidras o emulsiones del tipo agua en aceite. Los estudios previos realizados por nosotros muestran que se pueden obtener emulsiones estables de vaselina líquida en agua con un alto contenido de fase oleosa cuando se utiliza al colesterol junto con emulsionantes que poseen un elevado valor de Balance Hidrofílico-Lipofílico (HLB), tales como el laur...

  5. Comportamiento reológico no estacionario de emulsiones aceite en agua estabilizadas con un palmitato de sacarosa.

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    Partal, P.

    1997-12-01

    Full Text Available Non-steady flow properties of concentrated oil in water emulsions containing oil (60-80% wt., water and sucrose palmitate (1-5% wt. of high hydrophilic-lypophilic balance were investigated. Stress growth, steady flow and linear viscoelastic measurements were carried out for this study. The emulsions studied exhibited a thixotropic behavior showing a very rapid stress overshoot. The stress decay was fitted to a Figoni-Shoemaker model using two exponentials. An stress undershoot was also produced under certain conditions. Shear brought about strong structural changes, such as droplet size redistribution at high oil content and temperature. Thus, the steady state viscosity does not fit an Arrhenius type equation with temperature. A shear thinning behavior was found for the steady state viscosity and the peak viscosity.

    Se han estudiado emulsiones de calidad alimentaria aceite en agua estabilizadas por un palmitato de sacarosa de HLB=15. Dichas emulsiones se fabricaron a concentraciones comprendidas entre el 60 y el 80% (p/p en peso de aceite vegetal con un 1-5% (p/p en peso del sucroéster empleado como emulsionante. Para llevar a cabo este estudio se realizaron ensayos de crecimiento del esfuerzo, flujo estacionario y cizalla oscilatoria. Todos los sistemas estudiados presentan un comportamiento tixotrópico en flujo transitorio. Bajo determinadas condiciones, la cizalla puede hacer que el esfuerzo vuelva a aumentar con el tiempo tras haber alcanzado un valor pseudoestacionario. Este hecho se ha relacionado con una redistribución de tamaños de gota como consecuencia de la cizalla. Como resultado, la cizalla provoca una intensa destrucción estructural en los sitemas estudiados, no pudiéndose ajusfar la ecuación de Arrhenius a todo el Intervalo de temperaturas estudiado.

  6. 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.

  7. 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

  8. 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

  9. 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.

  10. Evolución de la cinética de emulsificación y de las propiedades reológicas de emulsiones aceite vegetal en agua preparadas con dos tipos de agitadores

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    Gallegos, C.

    2001-08-01

    Full Text Available This paper deals with the emulsification kinetics, rheological properties and droplet size distribution of oil-in-water emulsions, stabilised by non-ionic surfactant, using two different impellers, an anchor and a helical ribbon impeller. The geometric differences found between the impellers used produce a different flow pattern, that influences on the kinetics of emulsification, and so, on the droplet size distribution (DSD and the rheological properties of the final emulsion. There are significant differences on DSD when the emulsion is processed with different impellers at low agitation speed. The mechanical spectrum of these emulsions can be explained taking into account their DSD. However, at higher agitation speeds, the mechanical spectrum can not be explained on basis their DSD.Se estudia la cinética de emulsificación, propiedades reológicas y distribución de tamaños de gota de emulsiones aceite vegetal en agua, estabilizadas con un tensioactivo no iónico, usando dos tipos de agitadores, esto es, un agitador tipo ancla y uno helicoidal. Las diferencias geométricas existentes entre los agitadores utilizados conducen a la obtención de patrones de flujo diferentes, que puede afectar a la cinética de emulsificación, y por tanto, a la distribución de tamaños de gota (DTG y a las propiedades reológicas de la emulsión final. Existen diferencias significativas en la DTG cuando la emulsión se procesa con diferentes agitadores a bajas velocidades de agitación, correspondiendo las más favorables a aquellas preparadas con el agitador de ancla. El espectro mecánico de estas emulsiones puede explicarse atendiendo a su DTG. Sin embargo, a altas velocidades de agitación, la DTG no puede explicar las diferencias encontradas en el espectro mecánico de estas emulsiones.

  11. Modelo de Estabilidad de Emulsiones Poliméricas / Model of Polymers Emulsion's Stability

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    López Santamaría, Camilo Andrés

    2012-01-01

    En el presente documento se presenta el estudio de estabilidad de emulsiones poliméricas. Específicamente emulsiones de poliestireno en agua. Para ello se estudiaron los diferentes fenómenos que se presentan en sistemas coloidales, se llevó a cabo un desarrollo experimental en el que se desestabilizaron emulsiones de poliestireno por diferentes métodos, y se desarrolló una aplicación computacional capaz de predecir el comportamiento de emulsiones con diferentes propiedades. La síntesis de l...

  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. Formación y propiedades de espumas macroporosas de quitosano obtenidas a partir de emulsiones altamente concentradas

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    Miras Hernández, Jonatan

    2015-01-01

    [spa] El principal objetivo de la presente tesis es la obtención de espumas de quitosano mediante la utilización de emulsiones altamente concentradas de tipo aceite en agua (O/W). Para alcanzar dicho objetivo, este trabajo ha requerido la realización de diversas fases: (a) la selección del sistema tensioactivo mediante el estudio del comportamiento fásico, (b) la preparación de emulsiones altamente concentradas de tipo aceite en agua (O/W) en presencia de quitosano en la fase externa, (c) el...

  14. 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

  15. Estabilización de emulsiones por formación de complejos insolubles

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    Serrao, Rosa; Bregni, Carlos

    1987-01-01

    Con la finalidad de obtener emulsiones aceite-agua de aplicación en el campo farmacéutico y cosmético, se desarrolla una técnica original de estabilización mediante el empleo de montmorillonitas naturales y montmorillonitas saturadas de sodio, complejadas con sustancias polares orgánicas. Se comprueba la formación del complejo por difractometría de rayos X y la presencia de estructuras líquido-cristalinas por microscopía polarizante. Se proponen las condiciones óptimas de preparación de este ...

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

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    Geovanna Tafur; Jairo Martínez; Elena Stashenko

    2008-01-01

    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 inc...

  17. Actividad Fungicida e Insecticida de Emulsiones Agua/Aceite de Mezclas de Extractos de Nicotiana tabacum, Azadiractha indica y Eucalyptus tereticornis Fungicidal and Insecticide Activities of Water-in-Oil Emulsions of Mixtures from Extracts of Nicotiana taba-cum, Azadiractha indica and Eucalyptus tereticornis

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    Walter Murillo

    2012-01-01

    Full Text Available Se realizó un estudio sobre el potencial insecticida agudo y crónico sobre Drosophila melanogaster y antifúngico en Fusarium oxysporum de emulsiones aceite-en-agua de mezclas binarias y ternarias de extractos de Nicotiana tabacum, Azadiractha indica fneem, y aceite esencial de Eucalyptus tereticornis. Se construyeron curvas dosis/respuesta para el tiempo letal medio, relación pupa-huevo, adulto-pupa y porcentaje inhibitorio para la actividad antifúngica. Se observó alta actividad insecticida aguda del tabaco a 6 g/L (tiempo letal medio=2,3 ± 0,5 minutos, larvicida en el neem a 0,2 g/L (pupa-huevo= 0,05 y fungicida en el eucalipto a 3 g/L (porcentaje inhibitorio =100%. Las bioactividades se potenciaron en la mayoría de las mezclas binarias, exceptuando la actividad fungicida. La mezcla ternaria presentó actividad fungicida antagónica. Se concluye sobre la potencial aplicación de estos desarrollos para controlar plagas y enfermedades.A study on the acute and chronic insecticide potential on Drosophila melanogaster and antifungal on Fusarium oxysporum of oil-in-water emulsions of binary and ternary mixtures of extracts of Nicotiana tabacum and Azadiractha indica (neem and Eucalyptus tereticornis essential oil. Dose/response curves for the mean lethal time, pupae-egg ratio, adult-pupae and inhibitory rate for antifungal activity were constructed, compared with the bioactivity mixtures, measuring synergism, antagonism and joint activity. High insecticidal acute activity was observed in tobacco to 6 g/L (mean lethal time=2.3 ± 0.5 minutes, the neem larvicide to 0.2 g/L (pupae-egg ratio=0.05 and fungicide in the eucalyptus to 3 g/L (inhibitory rate=100%. The bioactivities were enhanced in almost all binary and ternary mixtures, except for the fungicidal activity. The ternary mixture exhibits fungicidal activity antagonistic. The study shows the potential application of these technologies to control pests and diseases.

  18. 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.

  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. Emulsiones múltiples: compuestos bioactivos y alimentos funcionales

    Directory of Open Access Journals (Sweden)

    Francisco Jiménez-Colmenero

    2013-10-01

    Full Text Available 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 estrategias tecnológicas habitualmente empleadas en la optimización de la presencia de compuestos bioactivos en alimentos más saludables y funcionales. Este artículo presenta un breve análisis de los tipos, características y formación de emulsiones múltiples, posibilidad de localización de compuestos bioactivos, así como su potencial aplicación en el diseño y preparación de alimentos saludables y funcionales. Tales aplicaciones se manifiestan especialmente relevantes en relación con aspectos cuantitativos y cualitativos del material lipídico (reducción de grasa/calorías y optimización del perfíl de ácidos grasos, encapsulamiento de compuestos bioactivos fundamentalmente hidrofílicos y reducción de sodio. Esta estrategia ofrece interesantes posibilidades en relación con el enmascaramiento de sabores y mejora de las propiedades sensoriales de los alimentos.

  1. 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.

  2. 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.

  3. Sector agua

    OpenAIRE

    Mabel Scharfhausen

    2012-01-01

    El agua constituye un recurso esencial para muchos aspectos de la vida humana como son el desarrollo y el bienestar humano. Gracias a los importantes avances en TICs es posible avanzar hacia soluciones que ofrecen una gestión eficiente e integral de los recursos hídricos, proporcionando datos en tiempo real respecto a la calidad, al consumo y la demanda del agua que permiten. Esto, no solamente para tener un mejor control del recurso, sino para hacer seguimiento del mismo y, quizás lo más imp...

  4. EFECTO DE EMULSIONES DE CERA Y 1-METILCICLOPROPENO EN LA CONSERVACIÓN POSCOSECHA DE GUANABANA

    OpenAIRE

    Beatriz Tovar-Gómez; Miguel Mata-Montes De Oca; Hugo Sergio García-Galindo; Efigenia Montalvo-González

    2011-01-01

    El fruto de guanábana (Annona muricata L.) es apreciado en el mercado nacional e internacional, pero su comercialización está limitada por su corta vida de anaquel. El fruto alcanza su madurez de consumo a los cinco días después de ser cosechado en madurez fisiológica, cuando se almacena a 25 ºC y de ocho a nueve días a 13 ± 2 ºC. El objetivo de este trabajo fue evaluar el efecto de tres emulsiones a base de ceras (Carnauba Tipo III, carnauba con aceites siliconados y candelilla) y el 1-metil...

  5. Biomass boilers

    OpenAIRE

    Nahodil, Jiří

    2011-01-01

    Bachelor’s thesis deals with the use of biomass for heating houses and apartment houses. The first part is dedicated to biomass. Here are mentioned the possibility of energy recovery, treatment and transformation of biomass into a form suitable for burning, its properties and combustion process itself. The second part is devoted to biomass boilers, their separation and description. The last section compares the specific biomass boiler with a boiler to natural gas, particularly from an economi...

  6. 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.

  7. 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.

  8. Efecto de diferentes éteres de celulosa sobre la estabilidad, estructura y digestibilidad in vitro de nuevas emulsiones

    OpenAIRE

    GIMÉNEZ I RIBES, GERARD

    2016-01-01

    [ES] Una buena vía de acción para luchar contra la obesidad y todas las enfermedades relacionadas con el sobrepeso podría ser el diseño de nuevas emulsiones, que proporcionen menos calorías al organismo, con las que reemplazar la grasa convencional de los alimentos. Sin embargo, la grasa contribuye positivamente a la aceptación sensorial de los alimentos por parte de los consumidores, al aportar una textura cremosa, buena palatabilidad, sabor agradable y efectos saciantes. Por esta razón,...

  9. 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.

  10. Diagnostico integrado de agua

    Directory of Open Access Journals (Sweden)

    Yanely de la Caridad Esquijarosa Abradelo

    2010-01-01

    Full Text Available Se aborda una metodología para el diagnóstico integrado del agua, basado en herramientas que brindan la información necesaria, teniendo en cuenta la necesidad de poner en práctica nuevas vías que posibiliten los índices cualitativos y cuantitativos de los servicios de agua, de acuerdo a la política energética y medioambiental y a las prioridades que demandan los objetivos sociales y económicos de cada territorio, que conllevan a la implantación de un sistema de gestión integral del agua.

  11. 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

  12. Steam boiler technology

    Energy Technology Data Exchange (ETDEWEB)

    Teir, S.

    2002-07-01

    The steam boiler technology e-Book is provided by the Laboratory of Energy Engineering and Environmental Protection at Helsinki University of Technology. The book covers the basics and the history of steam generation, modern boilers types and applications, steam/water circulation design, feedwater and steam systems components, heat exchangers in steam boilers, boiler calculations, thermal design of heat exchangers.

  13. Efecto del pH en emulsiones o/w formuladas con proteína de patata y quitosano

    Directory of Open Access Journals (Sweden)

    Calero, N.

    2013-03-01

    Full Text Available Emulsions formulated with healthy ingredients are becoming increasingly popular in the developed world, due to the consumer concern about diseases related to fat and to fatty diets. This study focuses on the O/W emulsions formulated with high-oleic sunflower oil, vegetable protein (potato protein and chitosan; and deals with the role of pH in the preparation of 40 wt% high-oleic sunflower oil in water emulsions. First of all, potato protein suspensions were prepared in a pH range from 2.0 to 11.5 and enhanced protein solubility was observed with increasing pH. An increase in pH emulsion resulted in more viscoelasticity as demonstrated by the greater values for the storage and lost moduli derived from small amplitude oscillatory shear measurements as well as by the progressive change in the shape of the mechanical spectrum. Flow curves showed shear thinning properties and increasing viscosity values with pH. Z-potential measurements revealed that attractive interactions between potato protein and chitosan progressively increased with pH. The results obtained are consistent with the occurrence of a protein-polysaccharide complex around the interface of oil droplets, which yielded enhanced physical stability.

    Las emulsiones con ingredientes saludables están adquiriendo más popularidad en el mundo desarrollado, ya que el consumidor es consciente de la relación existente entre algunas enfermedades y las dietas ricas en grasas. En este trabajo se estudian emulsiones O/W formuladas con aceite de girasol alto oleico, una proteína vegetal (proteína de patata y quitosano. Concretamente, se estudia la influencia del pH en la preparación de emulsiones que contenían 40% de aceite de girasol alto oleico. Se prepararon suspensiones de la proteína en un intervalo de valores de pH comprendido entre 2 y 11,5, observándose un aumento de solubilidad de la proteína al aumentar el pH. El aumento del pH de la emulsión provocó un aumento de la

  14. Concesiones de aguas

    Directory of Open Access Journals (Sweden)

    Carlos Labaure Aliseris

    2014-07-01

    Full Text Available El objeto del estudio que nos proponemos realizar es el de las concesiones de aguas.Dicho tema se inscribe en el más amplio de las concesiones en general, y de las concesiones de bienes del dominio público en particular.El estudio especial de las concesiones de aguas se justifica, ya que como en el caso de las demás concesiones sobre bienes del dominio público y privado del Estado, presenta particularidades en su régimen jurídico.El tema planteado fue objeto de nuestro análisis hace unos años, ya que precisamente nuestra tesis para aspirar al título de Profesor Adscripto fue el Código de Aguas, en que uno de los capítulos era el "Uso de las Aguas", que incluía a los permisos y concesiones de uso

  15. Influencia de variables de formulación en la viscosidad de emulsiones de surfactante aniónico-aceite-agua

    OpenAIRE

    Gerson Chávez; Irán Parra; Milangel Luzardo; Bélgica Bravo; Nacarid Delgado; Nelson Márquez

    2014-01-01

    Phase transition and viscosity behavior of emulsified systems were studied after modifying their physicochemical formulation. Effects of concentration and nature of salts and n-alcohols, and water/oil relation on the rheological properties of emulsions were also studied. Pre-equilibrated systems were emulsified according to an agitation procedure, and the viscosity (cP) was measured at different shear rates ranging from 1 to 300 s-1. The phase behavior, as well as the emulsion type based on e...

  16. Influencia de variables de formulación en la viscosidad de emulsiones de surfactante aniónico-aceite-agua

    Directory of Open Access Journals (Sweden)

    Gerson Chávez

    2014-04-01

    Full Text Available Phase transition and viscosity behavior of emulsified systems were studied after modifying their physicochemical formulation. Effects of concentration and nature of salts and n-alcohols, and water/oil relation on the rheological properties of emulsions were also studied. Pre-equilibrated systems were emulsified according to an agitation procedure, and the viscosity (cP was measured at different shear rates ranging from 1 to 300 s-1. The phase behavior, as well as the emulsion type based on electrolytic conductivity, was observed. Several interpretations of the flow and viscosity curves of emulsions were made through the estimation of rheological parameters such as consistency index "k" and behavior index "n".

  17. El Fenomeno de Maduracion de Ostwald. Predicciones de las Simulaciones de Estabilidad de Emulsiones sobre la Evolucion del Radio Cubico Promedio de una Dispersion de Aceite en Agua

    OpenAIRE

    Urbina-Villalba, German

    2013-01-01

    In this chapter, the theory of Lifshitz, Slesov and Wagner and the technique of Emulsion Stability Simulations (ESS) are reviewed. Complementary algorithms required to incorporate the phenomenon of Ostwald ripening in ESS are presented. The simulations are used to study the behavior of dodecane-in-water nanoemulsions as a function of time. The influence of electrostatic interactions, hydration forces, the initial drop size distributions, and the deformability of the drops, are studied. In par...

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

    OpenAIRE

    Franco, J. M.; Gallegos, C.; Sousa, I; Empis, J.; Raymundo, A.

    2001-01-01

    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 ...

  19. Potencial del agua del suelo

    OpenAIRE

    Bustamante Heliodoro

    2012-01-01

    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...

  20. Boilers, evaporators, and condensers

    International Nuclear Information System (INIS)

    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

  1. Central heating: package boilers

    Energy Technology Data Exchange (ETDEWEB)

    Farahan, E.

    1977-05-01

    Performance and cost data for electrical and fossil-fired package boilers currently available from manufacturers are provided. Performance characteristics investigated include: unit efficiency, rated capacity, and average expected lifetime of units. Costs are tabulated for equipment and installation of various package boilers. The information supplied in this report will simplify the process of selecting package boilers required for industrial, commercial, and residential applications.

  2. Conocemos el agua experimentando

    OpenAIRE

    Somavilla Bouzán, Sandra

    2013-01-01

    En este Trabajo Fin de Grado (TFG) se quiere poner de manifiesto la importancia de las ciencias y la experimentación durante las primeras etapas educativas. Para conocer el entorno inmediato se han diseñado una serie de actividades experimentales relacionadas con el conocimiento de una de las materias más importantes para la vida, el agua. Dichas actividades, recogidas bajo el nombre “Conocemos el agua”, se han llevado a la práctica en un aula real de Educación Infantil con niños/as de 5-6 añ...

  3. El agua: un recurso esencial

    Directory of Open Access Journals (Sweden)

    Alicia Fernández Cirelli

    2012-01-01

    Full Text Available El agua es esencial para la vida y para el desarrollo de las sociedades. Posee propiedades únicas. En este trabajo se describen: la composición de las aguas naturales; la calidad de agua para los diferentes usos y su deterioro y los parámetros físico-químicos y biológicos usados como indicadores de calidad. Por último, se resalta la importancia de la representatividad del muestreo y la calidad de las mediciones químicas para que los resultados obtenidos permitan conclusiones válidas.

  4. Steam boiler for fytomass

    OpenAIRE

    Baláš, Jiří

    2008-01-01

    The purpose of this Diploma Thesis was the construction design of the steam boiler for fytomass. For the specified parameters of biomass have been gradually implemented stoichiometric calculations of which are further based calculation of enthalpies of combustion gas. In the next part have been dealt with heat balance of the boiler, the efficiency of the boiler, recirculation of exhaust gases and the temperature of the combustion gases in outlet from fire. Thereinafter, the proposal of partic...

  5. 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.

  6. 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).

  7. 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,...

  8. Charting the boiler market

    International Nuclear Information System (INIS)

    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.

  9. a considerar. II. Aguas residuales urbanas

    Directory of Open Access Journals (Sweden)

    Fernando Ortega Sastriques

    2007-01-01

    Full Text Available El precio del agua potable es elevado y en muchas ciudades su disponibilidad está limitada y disminuirá en el futuro. La agricultura urbana es una concurrente en el uso del agua, en el futuro es muy probable que haya fuertes limitaciones para el riego con agua potable. Así es que para la producción de vegetales en medio urbano será necesario el empleo de agua de fuentes alternativas y no de los acueductos. Por lo general, el agua del subsuelo en el entorno de las ciudades, así como las corrientes superficiales está contaminada. En este trabajo se señalan los aspectos a tomar en cuenta para el riego seguro con aguas residuales, incluyendo las aguas albañales.

  10. Steam boiler technology

    Energy Technology Data Exchange (ETDEWEB)

    Teir, S.

    2003-07-01

    This book is the published version of the e-book with the same name. The interactive lecture slides, which accompany most chapters, exist only in the online version and on the attached CD-Rom. The Steam Boiler Technology e-book is the main course book for the course on steam boiler technology provided by the Laboratory of Energy Engineering and Environmental Protection at Helsinki University of Technology. The steam boiler technology e-Book is provided by the Laboratory of Energy Engineering and Environmental Protection at Helsinki University of Technology. The book covers the basics and the history of steam generation, modern boilers types and applications, steam/water circulation design, feedwater and steam systems components, heat exchangers in steam boilers, boiler calculations, thermal design of heat exchangers. The chapters of the second edition have been corrected based on reader and reviewer comments, and four new chapters have been added. The user interface of the electronic version has also been updated. The password for the online book will be changed once a year. If you have problems accessing the online book, or need a new password, please contact sebastian.teir@hut.fi.

  11. MODELLING, SIMULATING AND OPTIMIZING BOILERS

    DEFF Research Database (Denmark)

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

    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...

  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. Descubriendo que el agua moja

    OpenAIRE

    Renán Vega Cantor

    2014-01-01

    La influencia de los Estados Unidos en el Ejército colombiano. 1951-1959. Saúl Mauricto Rodríguez Hernández. La Carreta Editores y Universidad Nacional de Colombia, Departamento de Historia, Facullad de Ciencias Humanas, sede Bogotá, Colección Ojo de agua, 2006, 145 págs.

  14. 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

  15. 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...

  16. MODELLING, SIMULATING AND OPTIMIZING BOILERS

    DEFF Research Database (Denmark)

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

    to operate a boiler plant dynamically means that the boiler designs must be able to absorb any fluctuations in water level and temperature gradients resulting from the pressure change in the boiler. On the one hand a large water-/steam space may be required, i.e. to build the boiler as big as......This paper describes the modelling, simulating and optimizing including experimental verification as being carried out as part of a Ph.D. project being written resp. supervised by the authors. The work covers dynamic performance of both water-tube boilers and fire tube boilers. A detailed dynamic...... model of the boiler has been developed and simulations carried out by means of the Matlab integration routines. The model is prepared as a dynamic model consisting of both ordinary differential equations and algebraic equations, together formulated as a Differential-Algebraic-Equation system. Being able...

  17. MODELLING, SIMULATING AND OPTIMIZING BOILERS

    DEFF Research Database (Denmark)

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

    This paper describes the modelling, simulating and optimizing including experimental verification as being carried out as part of a Ph.D. project being written resp. supervised by the authors. The work covers dynamic performance of both water-tube boilers and fire tube boilers. A detailed dynamic...... model of the boiler has been developed and simulations carried out by means of the Matlab integration routines. The model is prepared as a dynamic model consisting of both ordinary differential equations and algebraic equations, together formulated as a Differential-Algebraic-Equation system. Being able...... to operate a boiler plant dynamically means that the boiler designs must be able to absorb any fluctuations in water level and temperature gradients resulting from the pressure change in the boiler. On the one hand a large water-/steam space may be required, i.e. to build the boiler as big as...

  18. Modelling, simulating and optimizing Boilers

    DEFF Research Database (Denmark)

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

    2003-01-01

    This paper describes the modelling, simulating and optimizing including experimental verication as being carried out as part of a Ph.D. project being written resp. supervised by the authors. The work covers dynamic performance of both water-tube boilers and re tube boilers. A detailed dynamic model...... of the boiler has been developed and simulations carried out by means of the Matlab integration routines. The model is prepared as a dynamic model consisting of both ordinary differential equations and algebraic equations, together formulated as a Differential-Algebraic- Equation system. Being able...... to operate a boiler plant dynamically means that the boiler designs must be able to absorb any uctuations in water level and temperature gradients resulting from the pressure change in the boiler. On the one hand a large water-/steam space may be required, i.e. to build the boiler as big as possible...

  19. Optimization of Load Assignment to Boilers in Industrial Boiler Plants

    Institute of Scientific and Technical Information of China (English)

    CAO Jia-cong; QIU Guang; CAO Shuang-hua; LIU Feng-qiang

    2004-01-01

    Along with the increasing importance of sustainable energy, the optimization of load assignment to boilers in an industrial boiler plant becomes one of the major projects for the optimal operation of boiler plants. Optimal load assignment for power systems has been a long-lasting subject, while it is quite new for industrial boiler plants. The existing methods of optimal load assignment for boiler plants are explained and analyzed briefly in the paper. They all need the fuel cost curves of boilers. Thanks to some special features of the curves for industrial boilers, a new model referred to as minimized departure model (MDM) of optimization of load assignment for boiler plants is developed and proposed in the paper. It merely relies upon the accessible data of two typical working conditions to build the model, viz. the working conditions with the highest efficiency of a boiler and with no-load. Explanation of the algorithm of computer program is given, and effort is made so as to determine in advance how many and which boilers are going to work. Comparison between the results using MDM and the results reported in references is carried out, which proves that MDM is preferable and practicable.

  20. a considerar. I. Aguas salinas o alcalinas

    Directory of Open Access Journals (Sweden)

    Fernando Ortega Sastriques

    2007-01-01

    Full Text Available El precio del agua potable es elevado y en muchas ciudades su disponibilidad está limitada y disminuirá en el futuro. La agricultura urbana es una concurrente en el uso del agua. En el futuro es muy probable que haya fuertes limitaciones para el riego con agua potable. Así es que para la producción de vegetales en medio urbano será necesario el empleo de agua de fuentes alternativas y no de los acueductos. La extracción de agua del manto freático para el riego es una práctica común que se incrementará en el futuro previsible. Casi todas las grandes urbes de Cuba tienen costas, es frecuente que los acuíferos subterráneos de estas ciudades presenten algún contenido de fácil solubilidad; o bien en otras ciudades interiores el agua puede ser alcalina. El riego con estos tipos de agua deprimen los rendimientos y pueden dañar los suelos y substratos. En este artículo se explican los aspectos que deben considerarse para poder emplear esta agua con seguridad.

  1. 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.

  2. 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. PMID:19192603

  3. 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

  4. Super Boiler 2nd Generation Technology for Watertube Boilers

    Energy Technology Data Exchange (ETDEWEB)

    Mr. David Cygan; Dr. Joseph Rabovitser

    2012-03-31

    This report describes Phase I of a proposed two phase project to develop and demonstrate an advanced industrial watertube boiler system with the capability of reaching 94% (HHV) fuel-to-steam efficiency and emissions below 2 ppmv NOx, 2 ppmv CO, and 1 ppmv VOC on natural gas fuel. The boiler design would have the capability to produce >1500 F, >1500 psig superheated steam, burn multiple fuels, and will be 50% smaller/lighter than currently available watertube boilers of similar capacity. This project is built upon the successful Super Boiler project at GTI. In that project that employed a unique two-staged intercooled combustion system and an innovative heat recovery system to reduce NOx to below 5 ppmv and demonstrated fuel-to-steam efficiency of 94% (HHV). This project was carried out under the leadership of GTI with project partners Cleaver-Brooks, Inc., Nebraska Boiler, a Division of Cleaver-Brooks, and Media and Process Technology Inc., and project advisors Georgia Institute of Technology, Alstom Power Inc., Pacific Northwest National Laboratory and Oak Ridge National Laboratory. Phase I of efforts focused on developing 2nd generation boiler concepts and performance modeling; incorporating multi-fuel (natural gas and oil) capabilities; assessing heat recovery, heat transfer and steam superheating approaches; and developing the overall conceptual engineering boiler design. Based on our analysis, the 2nd generation Industrial Watertube Boiler when developed and commercialized, could potentially save 265 trillion Btu and $1.6 billion in fuel costs across U.S. industry through increased efficiency. Its ultra-clean combustion could eliminate 57,000 tons of NOx, 460,000 tons of CO, and 8.8 million tons of CO2 annually from the atmosphere. Reduction in boiler size will bring cost-effective package boilers into a size range previously dominated by more expensive field-erected boilers, benefiting manufacturers and end users through lower capital costs.

  5. DOWNSCALE APPLICATION OF BOILER THERMAL CALCULATION APPROACH

    OpenAIRE

    Zelený, Zbynĕk; Hrdlička, Jan

    2016-01-01

    Commonly used thermal calculation methods are intended primarily for large scale boilers. Hot water small scale boilers, which are commonly used for home heating have many specifics, that distinguish them from large scale boilers especially steam boilers. This paper is focused on application of thermal calculation procedure that is designed for large scale boilers, on a small scale boiler for biomass combustion of load capacity 25 kW. Special issue solved here is influence of formation of dep...

  6. Calidad del agua potable en Huesca

    OpenAIRE

    Sancho Arroyo, Sandra; Pablo Aranda, Miriam

    2010-01-01

    El agua es uno de los recursos naturales fundamentales; es, seguramente el recurso que condiciona de manera prioritaria el desarrollo socioeconómico de los pueblos y la mejora del bienestar de la población. El agua presta un extraordinario servicio a la comunidad para mejorar su calidad de vida, pero, sobre todo, para satisfacer sus necesidades básicas, tales como la alimentación y la salud. Sin agua no son posibles las actividades agropecuarias y, especialmente, las agrícolas, que son el may...

  7. Small boiler uses waste coal

    Energy Technology Data Exchange (ETDEWEB)

    Virr, M.J. [Spinheat Ltd. (United States)

    2009-07-15

    Burning coal waste in small boilers at low emissions poses considerable problem. While larger boiler suppliers have successfully installed designs in the 40 to 80 MW range for some years, the author has been developing small automated fluid bed boiler plants for 25 years that can be applied in the range of 10,000 to 140,000 lbs/hr of steam. Development has centered on the use of an internally circulating fluid bed (CFB) boiler, which will burn waste fuels of most types. The boiler is based on the traditional D-shaped watertable boiler, with a new type of combustion chamber that enables a three-to-one turndown to be achieved. The boilers have all the advantages of low emissions of the large fluid boilers while offering a much lower height incorporated into the package boiler concept. Recent tests with a waste coal that had a high nitrogen content of 1.45% demonstrated a NOx emission below the federal limit of 0.6 lbs/mm Btu. Thus a NOx reduction on the order of 85% can be demonstrate by combustion modification alone. Further reductions can be made by using a selective non-catalytic reduction (SNCR) system and sulfur absorption of up to 90% retention is possible. The article describes the operation of a 30,000 lbs/hr boiler at the Fayette Thermal LLC plant. Spinheat has installed three ICFB boilers at a nursing home and a prison, which has been tested on poor-grade anthracite and bituminous coal. 2 figs.

  8. COMBINED BOILER WITH TPV

    OpenAIRE

    Björk, Magnus

    2013-01-01

    A TPV-system consists of a hot surface emitting heat radiation on a solar cell with a narrow bandgap.  A unit consisting of a boiler and a TPV-system has been constructed for testing of the performance of TPV cells. The emitter is heated by a fuel consisting of RME-oil. The radiation is collected and concentrated through two reflecting cones formed like a Faberge-egg, with an edge-type optical filter between the cones. The Faberge-egg is treated with electro-polishing in order to obtain a hig...

  9. Boilers a practical reference

    CERN Document Server

    Rayaprolu, Kumar

    2012-01-01

    AAbrasion and Abrasion Index (see Wear)Absolute or Dynamic Viscosity (æ) (see Viscosity in Fluid Characteristics)Acid Cleaning (see Commissioning)Acid Rain (also see Air Pollution Emissions and Controls and Gas Cleaning)Acid Sludge (see Refuse Fuels from Refinery in Liquid Fuels)Acid Smuts (see Oil Ash)Acoustic Soot Blowers (see Sonic Horns)Acoustic Enclosure (see Noise Control)Acoustic Leak Detection SystemAdiabatic Flame Temperature (see Combustion)Aeroderivative (see Types of GTs in Turbines, Gas)Ageing of Boiler ComponentsAgro-Fuels and FiringAir Ducts (see Draught Plant)Air Flow Measureme

  10. Boiler for ships; Hakuyo boira

    Energy Technology Data Exchange (ETDEWEB)

    Shimoda, F. [Mitsubishi Heavy Industries, Ltd., Tokyo (Japan)

    1999-07-20

    In this paper, production and technology trend of boiler for ships in 1998 are described. The actual results of main boiler are as follows. As the main boiler for LNG ships, 4 boilers produced by Mitsui Engineering and Shipbuilding for Qatar Project, 8 produced by Kawasaki Heavy Industries for South Korea and 10 produced by Mitsubishi Heavy Industries for domestic use and South Korea. 1998 was an active year for the main boiler for ships. The auxiliary boiler of steam pressure of 16k to 25k equipping for tanker ships was 115 (4,441t/h of steam quantity in total), it greatly increased in comparison with 88 (3,172t/h) produced in the proceeding year. Donkey boilers of steam pressure of 6k to 10k equipping for container ships and bulk cargo was 147 (672t/h), and it substantially decreased in comparison with 274 (693t/h) of the proceeding year, but capacity per boiler increased. The gas exhaust economizer for turbo power generation plants was 6 produced for VLCC. (NEDO)

  11. 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.

  12. 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.

  13. CFB boilers in multifuel application

    International Nuclear Information System (INIS)

    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)

  14. La calidad de las aguas españolas

    OpenAIRE

    Álvarez Cobelas, Miguel; Cabrera, Francisco, (S.I.) (1724-1799)

    1997-01-01

    La calidad del agua es un concepto de ciencia aplicada, variable en el espacio, en el tiempo y según la utilización del agua, que se suele plasmar en una normativa legal. En España la calidad de las aguas continentales ha sufrido un empobrecimiento en las últimas décadas, lo cual, ha repercutido sobre la vida en ellos. O dicho de otro modo, la calidad de la vida depende de la calidad del agua.

  15. Hybrid model of steam boiler

    International Nuclear Information System (INIS)

    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.

  16. en el riego con aguas residuales

    Directory of Open Access Journals (Sweden)

    Reynaldo Roque R.

    2006-01-01

    Full Text Available Es una realidad mundial, actual, que el agua potable es cada día más escasa para todos los usos en las actividades diarias de la población. La agricultura es el mayor consumidor de agua, con marcado incremento en los países en vías de desarrollo donde a su vez se requiere de una mayor producción de alimentos. En áreas urbanas y periurbanas el agua que se requiere para los cultivos hortícolas y riego de campos deportivos y de jardines compite fuertemente por las necesidades crecientes de la población. El uso de aguas residuales de las plantas de tratamiento y lagunas de oxidación se presenta como una alternativa viable para ser utilizada como agua de riego, empleando los sistemas de riego de pivote central, tecnología de punta que ha evolucionado cualitativamente en los últimos años, ofreciendo paquetes integrales, desde los módulos de emisores hasta las posibilidades de programación de los riegos que la hacen grandemente atractivas, técnica y económicamente para estos fines.

  17. 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.

  18. 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.

  19. Un uso eficiente del agua doméstica : tratamiento de las aguas grises

    OpenAIRE

    Castro Montilla, María

    2015-01-01

    El trabajo expuesto a continuación plantea la reutilización de las aguas grises como un método novedoso para conseguir un uso eficiente del agua en el ámbito doméstico, llevando consigo un ahorro del recurso para conseguir, por una parte, la reducción de los costes debido a un consumo menor del agua; y por otra, una reducción de la huella ecológica para contribuir a un progreso hacia una arquitectura más sostenible y solidaria con el medioambiente. Se desarrollarán conceptos que abarcan, d...

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

    OpenAIRE

    Cristina Postigo Rebollo; Meritxell Gros Calvo; María José López de Alda Villaizán; Mira Petrovic; Antoni Ginebreda Martí; Damià Barceló Culleres

    2011-01-01

    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 emis...

  1. Agua y tiempo en el arte

    OpenAIRE

    Pando Despierto, Juan

    1993-01-01

    Elemento básico de la división simbólica del mundo antiguo, el agua sigue siéndolo en la modernidad, y con una autoridad indiscutible, a la que su propia potencia —y su rareza esencial tratándose de agua dulce—, proporcionan un vigor estético y una fuerza geoestratégica planetarias. El arte hizo siempre del agua un factor de meditación y de representación, de concreción de los sueños del hombre. Su ductilidad plástica, propia para todos los marcos, todas las facturas, la hiz...

  2. 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.

  3. 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 superficie tot...

  4. El riego con aguas de mala calidad en la agricultura urbana. Aspectos a considerar. II. Aguas residuales urbanas

    OpenAIRE

    Fernando Ortega Sastriques; Rosa Orellana Gallego

    2007-01-01

    El precio del agua potable es elevado y en muchas ciudades su disponibilidad está limitada y disminuirá en el futuro. La agricultura urbana es una concurrente en el uso del agua, en el futuro es muy probable que haya fuertes limitaciones para el riego con agua potable. Así es que para la producción de vegetales en medio urbano será necesario el empleo de agua de fuentes alternativas y no de los acueductos. Por lo general, el agua del subsuelo en el entorno de las ciudades, así como l...

  5. El riego con aguas de mala calidad en la agricultura urbana. Aspectos a considerar. I. Aguas salinas o alcalinas

    OpenAIRE

    Fernando Ortega Sastriques; Rosa Orellana Gallego

    2007-01-01

    El precio del agua potable es elevado y en muchas ciudades su disponibilidad está limitada y disminuirá en el futuro. La agricultura urbana es una concurrente en el uso del agua. En el futuro es muy probable que haya fuertes limitaciones para el riego con agua potable. Así es que para la producción de vegetales en medio urbano será necesario el empleo de agua de fuentes alternativas y no de los acueductos. La extracción de agua del manto freático para el riego es una práctica común q...

  6. 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.

  7. 10 CFR 431.82 - Definitions concerning commercial packaged boilers.

    Science.gov (United States)

    2010-01-01

    ... pressure boiler means a packaged boiler that is: (1) A steam boiler designed to operate at a steam pressure... steam boiler designed to operate at or below a steam pressure of 15 psig; or (2) A hot water boiler... efficiency for a commercial packaged boiler is determined using test procedures prescribed under § 431.86...

  8. Trihalometanos en aguas de consumo humano

    Directory of Open Access Journals (Sweden)

    C Hernández Sánchez

    2011-01-01

    Full Text Available 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 de consumo humano constituye la principal vía de exposición del hombre a estos compuestos, su presencia en las aguas de consumo humano está limitada por la Directiva Europea 98/83/CE a 100 ìg/L. En esta revisión se destacan los aspectos más relevantes sobre su toxicidad, reglamentación, determinación, concentración en aguas, variaciones estacionales y eliminación.

  9. Boiler Retrofit for the Utilization of Biodiesel

    OpenAIRE

    Leily Nurul Komariah; Marwani Marwani

    2016-01-01

    Fuel oil used in the boiler is able to substitute with biodiesel. In lower blends, there are no engine modification needed, but some researchers recommended some technical adjustments in order to maintain the boiler's performance and equipment durability. This study consists of the comparison between the performance of boiler before and after retrofitting on the use of biodiesel. The diesel oil was introduced in biodiesel blends of 10% (B10), 20% (B20) and 25% (B25). A fire tube boiler was us...

  10. 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... Steam Gauges § 230.47 Boiler number. (a) Generally. The builder's number of the boiler, if known, shall be stamped on the steam dome or manhole flange. If the builder's number cannot be obtained,...

  11. 29 CFR 1915.162 - Ship's boilers.

    Science.gov (United States)

    2010-07-01

    ... Ship's boilers. (a) Before work is performed in the fire, steam, or water spaces of a boiler where employees may be subject to injury from the direct escape of a high temperature medium such as steam, or... dead boiler with the live system or systems shall be secured, blanked, and tagged indicating...

  12. Sootblowing optimization for improved boiler performance

    Science.gov (United States)

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

    2013-07-30

    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.

  13. Sootblowing optimization for improved boiler performance

    Energy Technology Data Exchange (ETDEWEB)

    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.

  14. 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.

  15. Adaptive controlling of power boiler

    OpenAIRE

    Wojcik, W.; Kalita, M; Smolarz, A.

    2004-01-01

    This paper presents research on adaptive control (AC) of combastion process in in¬dustry. Results were obtained from research conducted in laboratory combustion chamber with usage of Fiber Optical Measurement System (FOMS) with electronic block. Simulation proved that implementing AC and FOMS to burning process improves flue gasses parameters -direct measure of power boiler ecologic and economical quality of work.

  16. Developing Boiler Concepts as Integrated Units

    DEFF Research Database (Denmark)

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

    2004-01-01

    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...... bricks in the boiler concept to each other and hereby obtain signicant reductions in the boiler concepts weight and foot-print . The actual development project has focused on an heavy fuel oil-red boiler for the marine market with a capacity in the range 1-10 t/h saturated steam. The development project...

  17. 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...

  18. Sistemas de plantas de tratamiento de aguas residuales en Colombia

    OpenAIRE

    Lizarazo Becerra, Jenny Milena; Orjuela Gutiérrez, Martha Isabel

    2013-01-01

    El establecimiento de Sistemas de tratamiento de aguas residuales son importantes para proteger el Salud Pública y el medio ambiente. Si las aguas residuales van a ser vertidas a un cuerpo receptor natural (mar, ríos, lagos), será necesario realizar un tratamiento para evitar enfermedades causadas por bacterias y virus en las personas que entran en contacto con esas aguas, y también para proteger la fauna y flora presentes en el cuerpo receptor natural. El reúso del agua tratada, riego de áre...

  19. Arquitectura sostenible y conservación de agua

    OpenAIRE

    Lozano Portillo, Ana

    2008-01-01

    Esta monografía presenta la transcripción de la conferencia "Arquitectura sostenible y conservación de agua", pronunciada por Ana Lozano Portillo en el marco de la III Jornada Internacional sobre ahorro de agua organizada por el Ente Público del Agua de la Región de Murcia, celebrada el 12 de junio de 2008. Lozano Portillo, A. (2008). Arquitectura sostenible y conservación de agua. Cátedra Universidad Empresa Arquitectura Sostenible Bancaja Habitat. http://hdl.handle.net/10251/17962.

  20. Agua y emprendimiento social = Atrapanieblas y huertos urbanos

    OpenAIRE

    Cruz Gutiérrez, Abel

    2016-01-01

    El proyecto Acceso al Agua por Sistemas de Atrapanieblas de la Asociación “Peruanos sin Agua” con aguas no convencionales, Lluvias y Neblina. Por: Abel Cruz, Emprendedor Social y Líder del Movimiento Peruanos sin Agua El sistema atrapanieblas consiste en atrapar las gotas de agua microscópicas de la neblina a través del uso de mallas parecidas a una red. Las pequeñas gotas de la niebla quedan adheridas en los hilos de las mallas para luego ser redirigidas y acumuladas en depósitos. A...

  1. CFD Simulation On CFBC Boiler

    OpenAIRE

    Amol S. Kinkar; G. M. Dhote; R.R. Chokkar

    2015-01-01

    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...

  2. Scandinavian baffle boiler design revisited

    OpenAIRE

    Stepanov Borivoj Lj.; Pešenjanski Ivan K.; Spasojević Momčilo Đ.

    2015-01-01

    The aim of this paper is to examine whether the use of baffles in a combustion chamber, one of the well-known low-cost methods for the boiler performance improvement, can be enhanced. Modern day tools like computational fluid dynamics were not present at the time when these measures were invented, developed and successfully applied. The objective of this study is to determine the influence of location and length of a baffle in a furnace, for different mass ...

  3. 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)

  4. 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)

  5. Business opportunities in boiler control systems

    Energy Technology Data Exchange (ETDEWEB)

    McHale, A.P.

    1988-03-01

    Each year some Pound 4.5 billion is spent on fuel to fire the UK non-domestic boiler stock. The average age of the 500 000 population of boilers is more than 10 years and in that time great advances have been made in the capacity and capability of microprocessor controls. There is undoubtedly an enormous potential to retrofit existing boilers with the latest controls both to improve efficiency of production and utilisation.

  6. Modeling of fire-tube boilers

    OpenAIRE

    Ortiz, F.J. Gutiérrez

    2011-01-01

    Abstract In fire-tube boilers, the flue gas passes inside boiler tubes, and heat is transferred to water on the shell side. A dynamic model has been developed for the analysis of boiler performance, and Matlab has been applied for integrating it. The mathematical model developed is based on the first principles of mass, energy and momentum conservations. In the model, the two parts of the boiler (fire/gas and water/steam sides), the economizer, the superheater and the heat recovery...

  7. Boiler plants completed in record time

    International Nuclear Information System (INIS)

    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

  8. 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.

  9. 49 CFR 230.30 - Lap-joint seam boilers.

    Science.gov (United States)

    2010-10-01

    ..., 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...

  10. De la pileta a las aguas abiertas

    OpenAIRE

    Ferreyra Balestra, Juan Pablo

    2013-01-01

    Dentro de las prácticas acuáticas, encontramos distintas disciplinas que la abarcan. Entre ellas encontramos a la natación tradicional (con sus 4 técnicas de nado y sus competencias), el waterpolo, nado sincronizado, saltos ornamentales, aguas abiertas, etc. Sobre esta última mencionada será el propósito de mi trabajo. Esta disciplina consiste en nadar en lugares abiertos como el mar, ríos, lagos y lagunas en lugar de hacerlo en una pileta. Aunque seamos expertos y llevemos años nadando en...

  11. Pensando al agua como parte del paisaje

    OpenAIRE

    Lorena Salvatelli

    2009-01-01

    El objetivo de este trabajo es discutir la importancia de los estudios de arqueología terrestre y subacuática como parte de un mismo proceso de interpretación del pasado. Se entiende que el registro arqueológico puede hallarse actualmente en una variedad de ambientes tanto terrestres como subacuáticos a causa de varias razones, como por ejemplo las oscilaciones de los niveles de agua ocurridas entre el Pleistoceno Final y el Holoceno Medio. Por lo tanto, se propone que para su ...

  12. Gente, tierra y agua en la Amazonia

    OpenAIRE

    Buitrago Garavito, Ana Isabel; Jiménez, Eliana; Tobón, Marco Alejandro; Gendrau Acho, Sheila; Ciro Rodríguez, Estefanía; Ciro Rodríguez, Alejandra; Trujillo Osorio, Catalina; Currea Dereser , Alejandra; Torres Zambrano, Nestor Ned; Serrato Hurtado, Clemencia; Santiago R. Duque; Moreno Hurtado, Flavio; Peñuela, Maria Cristina; Lloyd, Jon; Patiño, Sandra

    2008-01-01

    Con el ánimo de contribuir a la comprensión social, histórica y económica de la gente que habita la región amazónica y al entendimiento del funcionamiento de sus ecosistemas surge el libro Gente, tierra y agua en la Amazonia. lmani mundo III. Este libro es el tercero de la serie Imani mundo, la cual expone trabajos de investigación en la región amazónica tanto en aspectos sociales como en aspectos ecológicos, realizados por el instituto Amazónico de Investigaciones IMANI de la Universidad Nac...

  13. OBTENCIÓN DE LA CURVA DE DEMANDA DE AGUA TURÍSTICA PARA ACAPULCO, GUERRERO

    OpenAIRE

    Miguel Angel Cruz Vicente

    2011-01-01

    El agua se aprovecha en diversos usos que se diferencian por ser consuntivos y no consuntivos. Los primeros impactan en la disponibilidad porque aprovechan el agua y sólo retornan una parte de ésta (consumen agua), los no consuntivos retornan la totalidad del agua aprovechada (usan agua). En la clasificación del uso no consuntivo se encuentra el de recreación y turismo que se refiere a las actividades de contacto directo con el agua; por consiguiente, la disponibilidad de agua es básica para ...

  14. 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...

  15. Seeking for total efficiency on boiler operation

    International Nuclear Information System (INIS)

    In this paper, as for the boiler in the private power generation plant which has been in operation since July, 1974 based on the production increase project of the factory, the measures for energy conservation considered from the planning and design stage, the countermeasures to the low loading of the boiler by the epoch-making effect of the energy conservation in the production system since the oil crisis in 1973, and the cost management of the boiler are described. The outline of the private power generation plant is shown. The boiler facilities are the boiler for power generation of 81 kg/cm2, 433degC, 65 t/h, the saturation boiler of 30 kg/cm2, 211degC, 47 t/h, and the waste heat boiler of 22 kg/cm2, 211 degC, 4.2 t/h. As the measures for energy conservation, tangential corner firing-two stage combustion process was adopted, and the total heat of recovered drain has been utilized. The remodeling and the effect of improvement of the boiler and the turbine as the countermeasures to low loading are reported. The examples of other energy conservation in the waste tire incinerator, air compressor, exhaust desulfurizer and air preheater are described. (K.I.)

  16. 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.

  17. 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.

  18. LECTURAS DEL AGUA (SÍMBOLOS, ECOCRÍTICA Y CULTURA DEL AGUA

    Directory of Open Access Journals (Sweden)

    Eloy Martos Núñez

    2012-08-01

    Full Text Available Existen diversos paradigmas sobre el estudio del agua que inciden en ella desde distintos puntos de vista. La gestión del agua es abordada desde las ciencias físicas y geológicas, y se soporta sobre tecnologías como la ingeniería hidráulica. En el aspecto histórico-social, se subraya la importancia de considerar el agua no como un recurso como parte esencial de una cosmovisión que vertebra el patrimonio cultural de una comunidad. Por ejemplo, en el estudio de los desastres (inundaciones, plagas, etc. se ha puesto el énfasis en los datos hidroclimáticos, las respuestas sociales o la vulnerabilidad social. Sin embargo, la ecocrítica ha subrayado el papel de las fabulaciones folklóricas y de los Imaginarios en general para aportar una comprensión holística del problema. Los discursos fabulados admonitorios sobre las aguas y sus riesgos subrayan la importancia de estos lugares de memoria y de reforzar las identidades a través de estas ecoficciones y rituales. Se convierten, pues, en tradiciones útiles porque en realidad hablan de la sostenibilidad, la ética y la necesidad de preservar la memoria y la identidad cultural de la comunidad, frente a la depredación de la Naturaleza. De este modo, el conocimiento de esta cultura del agua no sólo contribuye a la adquisición de las competencias básicas de la educación, y en particular, a la educación literaria y del patrimonio, sino que contribuye a la gobernanza del agua y a la gestión sostenible y responsable de los recursos hídricos. Como indica E. Morin, la lectura y la literatura son una escuela de complejidad, y estos mitos inciden siempre en la multicausalidad de las acciones humanas.http://dx.doi.org/10.14572/nuances.v22i23.1749

  19. Optimizing the integrated design of boilers - simulation

    DEFF Research Database (Denmark)

    Sørensen, Kim; Karstensen, Claus M. S.; Condra, Thomas Joseph;

    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...... important to see the 3 components as an integrated unit and optimize these as such. This means that the burner must be designed and optimized exactly to the pressure part where it is utilized, the control system must have a conguration optimal for the pressure part and burner where it is utilized etc....... Traditionally boiler control systems have been designed in a rather simple manner consisting of a feed water controller and a pressure controller; two controllers which, in principle, operated without any interaction - for more details on boiler control see [4]. During the last year Aalborg Industries A/S has...

  20. PAH emission from the industrial boilers.

    Science.gov (United States)

    Li, C; Mi, H; Lee, W; You, W; Wang, Y

    1999-10-01

    Polycyclic aromatic hydrocarbons (PAHs) emitted from 25 industrial boilers were investigated. The fuels used for these 25 boilers included 21 heavy oil, two diesel, a co-combustion of heavy oil and natural gas (HO+NG) and a co-combustion of coke oven gas and blast furnace gas (COG+BFG) boilers. PAH samples from the stack flue gas (gas and particle phases) of these 25 boilers were collected by using a PAH stack sampling system. Twenty one individual PAHs were analyzed primarily by a gas chromatography/mass spectrometer (GC/MS). Total-PAH concentration in the flue gas of 83 measured data for these 25 boiler stacks ranged between 29.0 and 4250 microg/m(3) and averaged 488 microg/m(3). The average of PAH-homologue mass (F%) counted for the total-PAH mass was 54.7%, 9.47% and 15.3% for the 2-ring, 3-ring and 4-ring PAHs, respectively. The PAHs in the stack flue gas were dominant in the lower molecular weight PAHs. The emission factors (EFs) of total-PAHs were 13,300, 2920, 2880 and 208 microg/kg-fuel for the heavy oil, diesel, HO+NG and COG+BFG fueled-boiler, respectively. Nap was the most predominant PAH occurring in the stack flue gas. In addition, the EF of 21 individual PAHs in heavy-oil boiler were almost the highest among the four various fueled-boilers except for those of FL and BkF in the diesel boiler. Furthermore, the EF of total-PAHs or BaP for heavy oil were both one order of magnitude higher than that for the diesel-fueled boiler. PMID:10502602

  1. Computer system for monitoring power boiler operation

    Energy Technology Data Exchange (ETDEWEB)

    Taler, J.; Weglowski, B.; Zima, W.; Duda, P.; Gradziel, S.; Sobota, T.; Cebula, A.; Taler, D. [Cracow University of Technology, Krakow (Poland). Inst. for Process & Power Engineering

    2008-02-15

    The computer-based boiler performance monitoring system was developed to perform thermal-hydraulic computations of the boiler working parameters in an on-line mode. Measurements of temperatures, heat flux, pressures, mass flowrates, and gas analysis data were used to perform the heat transfer analysis in the evaporator, furnace, and convection pass. A new construction technique of heat flux tubes for determining heat flux absorbed by membrane water-walls is also presented. The current paper presents the results of heat flux measurement in coal-fired steam boilers. During changes of the boiler load, the necessary natural water circulation cannot be exceeded. A rapid increase of pressure may cause fading of the boiling process in water-wall tubes, whereas a rapid decrease of pressure leads to water boiling in all elements of the boiler's evaporator - water-wall tubes and downcomers. Both cases can cause flow stagnation in the water circulation leading to pipe cracking. Two flowmeters were assembled on central downcomers, and an investigation of natural water circulation in an OP-210 boiler was carried out. On the basis of these measurements, the maximum rates of pressure change in the boiler evaporator were determined. The on-line computation of the conditions in the combustion chamber allows for real-time determination of the heat flowrate transferred to the power boiler evaporator. Furthermore, with a quantitative indication of surface cleanliness, selective sootblowing can be directed at specific problem areas. A boiler monitoring system is also incorporated to provide details of changes in boiler efficiency and operating conditions following sootblowing, so that the effects of a particular sootblowing sequence can be analysed and optimized at a later stage.

  2. El acceso al agua para consumo humano en Colombia

    OpenAIRE

    Martha Yánez Contreras; Karina Acevedo González

    2013-01-01

    El acceso al agua es un derecho humano que se debe garantizar sin ninguna discriminación. Este artículo examina la existencia de inequidades en el ejercicio de este derecho mediante un análisis discriminante que identifica los factores que explican las diferencias en la calidad del agua para consumo humano entre los municipios colombianos en 2009. Los resultados indican que existen inequidades en el acceso al agua potable. En particular, los municipios más pobres registran los niveles de cali...

  3. 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 COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) MARINE ENGINEERING PERIODIC TESTS AND 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...

  4. Electrical design requirements for electrode boilers for nuclear plants

    International Nuclear Information System (INIS)

    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

  5. Boiler Retrofit for the Utilization of Biodiesel

    Directory of Open Access Journals (Sweden)

    Leily Nurul Komariah

    2016-02-01

    Full Text Available Fuel oil used in the boiler is able to substitute with biodiesel. In lower blends, there are no engine modification needed, but some researchers recommended some technical adjustments in order to maintain the boiler's performance and equipment durability. This study consists of the comparison between the performance of boiler before and after retrofitting on the use of biodiesel. The diesel oil was introduced in biodiesel blends of 10% (B10, 20% (B20 and 25% (B25. A fire tube boiler was used for the test with pressure of 3 bar and heat input capacity of 60,000 kcal. The boiler retrofit is conducted by fine tuning the fan damper scale (FDS and adding a heating feature on fuel system. It was specifically intended to maintain the quality of combustion and boiler efficiency as well as to avoid an increase in fuel consumption. The combustion behaviour was monitored by exhaust emissions of CO, NOx, and SO2. The fan damper scale (FDS and fuel temperature is adjusted by the increasing portion of biodiesel used. The fuel heating apparatus was set at temperature of 40oC for the use of B10, and 60oC for B20 and B25. The FDS adjustment was successfully resulted a reduction in rate of combustion air by average of 9.2%. The boiler retrofitting for the utilization of B10, B20 and B25 showed an increase in boiler efficiency by 0.64%, 0.42% and 2.6% respectively. The boiler retrofitting is surprisingly reduced the fuel consumption by average of 11.2%.

  6. Agua subterránea, deterioro de calidad y reserva

    OpenAIRE

    Auge, Miguel

    2008-01-01

    El agua en general y la subterránea en particular es un recurso limitado en nuestro planeta, donde más del 97% es salada y se concentra en mares y océanos. Del resto, alrededor del 2% constituye los casquetes polares en forma de hielo. Le sigue en magnitud el agua subterránea, cuya reserva hasta 1.000 m de profundidad se estima en el 0,5% del total, mientras que el volumen instantáneo de agua superficial llega a sólo el 0,02% y entre el agua del suelo y la atmosférica, componen algo más del 0...

  7. Power for the industrial age: a brief history of boilers

    Energy Technology Data Exchange (ETDEWEB)

    Kuehn, S.E.

    1996-02-01

    Boilers were first designed in Greece during the Hellenistic period by Hero, but they were regarded purely as a novelty and no industrial application was found for these toys until the seventeenth century when mining engineers used them for steam-powered pumps. By the end of the 17th century the early shell boilers were replaced by tube boilers, the direct ancestors of the modern boiler. Among the best known of the early boiler manufacturers was Babcock and Wilcox, and they supplied boilers to one of the first electric power plants. In the early 20th century superheaters, economizers, stokers and pulverizers were added to the design of the utility boiler. Fusion-welded boiler drums added to safety. More recently environmental concerns have initiated a new generation of boilers, such as the pressurised fluidised bed combustion boilers and their advanced versions. 5 refs., 3 figs.

  8. El agua, el TLC y el agro

    Directory of Open Access Journals (Sweden)

    Alfredo Suárez Mejía

    2006-01-01

    Full Text Available Este artículo de absoluta actualidad se re- fiere al tratamiento que el poder ejecutivo viene dando al tema del agro y los recursos de los cuales depende. Ya en prensa el tema de tierras, corrupción y violencia ha sido registrado en relación con el gobierno del presidente Uribe y el Incoder. Ahora se trata de examinar de qué manera el Incoder desmonta el manejo y propiedad de los distritos de adecuación de tierras de los cuales depende la actividad agropecuaria sin que para tal expropiación del recurso agua se requiera acudir a las instancias de un TLC. La hipertrofia de las posiciones contra el TLC ha permitido sin lugar a dudas que desde el derecho interno mientras se negocia se adelanten las normas que permiten las inversiones que interesan al espacio de la “integración comercial”

  9. 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.

  10. Pensando al agua como parte del paisaje

    Directory of Open Access Journals (Sweden)

    Lorena Salvatelli

    2009-12-01

    Full Text Available El objetivo de este trabajo es discutir la importancia de los estudios de arqueología terrestre y subacuática como parte de un mismo proceso de interpretación del pasado. Se entiende que el registro arqueológico puede hallarse actualmente en una variedad de ambientes tanto terrestres como subacuáticos a causa de varias razones, como por ejemplo las oscilaciones de los niveles de agua ocurridas entre el Pleistoceno Final y el Holoceno Medio. Por lo tanto, se propone que para su recuperación debe utilizarse una metodología adaptada al medio ambiente en el cual se encuentre. En este sentido, es importante la interpretación integral del paisaje para acceder a la comprensión de la diversidad ambiental en la que se puede emplazar un sitio arqueológico, y en consecuencia poder “bucear” un registro integrado.

  11. New accomplishments of Ambiente & Agua scientific journal

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2009-04-01

    Full Text Available Ambiente & Água – An Interdisciplinary Journal of Applied Science (Ambi-Agua was classified as B2 in the Interdisciplinary Area, the major thematic area of this journal, by CAPES classification system known as "Qualis". Also, the journal was registered in the Digital Object Identifier (DOI® System. Three other facts were accomplished: 1 all published articles since April, 2008 have the submitted and accepted dates stamped; 2 long-term preservation will be now secured in association with DOAJ - Lund University Libraries and the e-Depot of the National Library of the Netherlands (KB; and 3 we entered into an electronic licensing relationship with EBSCO Publishing to have full text of our journal in EBSCO Publishing's databases in the near future.

  12. El agua, el TLC y el agro

    Directory of Open Access Journals (Sweden)

    Claudia Sampedro Torres

    2006-11-01

    Full Text Available Este artículo de absoluta actualidad se refiere al tratamiento que el poder ejecutivo viene dando al tema del agro y los recursos de los cuales depende. Ya en prensa el tema de tierras, corrupción y violencia ha sido registrado en relación con el gobierno del presidente Uribe y el Incoder. Ahora se trata de examinar de qué manera el Incoder desmonta el manejo y propiedad de los distritos de adecuación de tierras de los cuales depende la actividad agropecuaria sin que para tal expropiación del recurso agua se requiera acudir a las instancias de un

  13. 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.

  14. Chemical cleaning of UK AGR boilers

    International Nuclear Information System (INIS)

    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)

  15. Boiler efficiency methodology for solar heat applications

    Science.gov (United States)

    Maples, D.; Conwell, J. C.; Pacheco, J. E.

    1992-08-01

    This report contains a summary of boiler efficiency measurements which can be applied to evaluate the performance of steam-generating boilers via both the direct and indirect methods. This methodology was written to assist industries in calculating the boiler efficiency for determining the applicability and value of thermal industrial heat, as part of the efforts of the Solar Thermal Design Assistance Center (STDAC) funded by Sandia National Laboratories. Tables of combustion efficiencies are enclosed as functions of stack temperatures and the amount of carbon dioxide and carbon monoxide in the gas stream.

  16. Modelling and simulating fire tube boiler performance

    DEFF Research Database (Denmark)

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

    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....

  17. Modelling and simulating fire tube boiler performance

    DEFF Research Database (Denmark)

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

    2003-01-01

    A model for a ue gas boiler covering the ue 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 dened 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 MatLab/Simulink has...... been applied for carrying out the simulations. To be able to verify the simulated results an experiments has been carried out on a full scale boiler plant....

  18. Ecological boiler modernization, feasible energy solutions

    International Nuclear Information System (INIS)

    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

  19. Gas fired boilers and atmospheric pollution

    International Nuclear Information System (INIS)

    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

  20. Removal of External Deposits on Boiler Tubes

    Directory of Open Access Journals (Sweden)

    C. P. De

    1970-07-01

    Full Text Available The superheater tubes in Port and Starboard boilers were found to have completely clogged by heavy deposits, which on analysis mainly vanadium pentoxide and sodium sulphmatter. The cleaning of the deposits was accomplished by alternate spraying with 15-20 per cent hydrogen peroxide and washing with hot water jets. Over the past two years, since the date of cleaning, the IN ship is operating without any trouble in the boilers.

  1. 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. PMID:22049674

  2. Transients in a circulating fluidized bed boiler

    OpenAIRE

    Baskakov, A. P.; Munts, V. A.; Pavlyuk, E. Yu.

    2013-01-01

    Transients in a circulating fluidized bed boiler firing biomass are considered. An attempt is made to describe transients with the use of concepts applied in the automatic control theory. The parameters calculated from an analysis of unsteady heat balance equations are compared with the experimental data obtained in the 12-MW boiler of the Chalmers University of Technology. It is demonstrated that these equations describe the transient modes of operation with good accuracy. Dependences for ca...

  3. 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

  4. 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. PMID:22316759

  5. Research and design of 330 MW circulating fluidized bed boiler

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Xianbin; Shi, Zhenghai; Huang, Zhong [Thermal Power Research Institute, Xi' an (China); Jiang, Minhua [China Huaneg Group, Beijing (China); Yu, Long; Zhang, Yanjun; Wang, Fengjun; Zhang, Man [Harbin Boiler CO., Ltd, Harbin (China)

    2013-07-01

    Based on research and manufacture of 210MW circulating fluidized bed (CFB) boiler, the key technologies of large CFB boiler have been Research, the plan design of 330MW CFB boiler have been performed, construction design of key components and scaling up characteristics were analysed, The 330MW CFB boiler designed demonstration project has been put into commercial operation, It is the largest capacity CFB boiler operated in china now, Operation of 330MW CFB boiler was stable and good performance has been proved.

  6. Fuel sulfur and boiler fouling

    Energy Technology Data Exchange (ETDEWEB)

    Litzke, W.; Celebi, Y.; Butcher, T. [Brookhaven National Lab., Upton, NY (United States)

    1995-04-01

    Fouling of the heat transfer surfaces of boilers and furnaces by `soot` leads to reduced efficiency and increased service requirements. The average level of annual efficiency reduction as a result of fouling if generally accepted as 2% per year. Improving the efficiency of equipment in the field may be the most important oil heat conservation opportunity at present. Improvements can be realized by reducing fouling rates, promoting lower firing rates in existing equipment, and enabling excess air levels to be set lower without raising concerns about increased service requirements. In spite of the importance of efficiency in the field there is very little data available on efficiency degradation rates with modern equipment, actual field operating conditions (excess air and smoke number settings) and service problems which affect efficiency. During 1993-94 field tests were initiated to obtain such data and to obtain information that would compliment existing and current laboratory work. Experimental work conducted on a bench scale level have included tests with various advanced burners, fuel types, and different operating conditions which have been done at the BNL Rapid Fouling Test Facility. This report will focus on the field study of fouling effects on ten residential heating service problems at each site are summarized. In addition, the technical difficulties involved with conducting such a field study shall also be discussed as the findings should serve to improve future work in this area.

  7. Characterization of model boiler specimens

    International Nuclear Information System (INIS)

    This paper describes the general results of an investigation of three crevice corrosion samples provided by Westinghouse from the S112-1 Model Boiler Program. These samples had all been formed under essentially the same initial chemical conditions, but two had been treated with inhibitors at the end of the experimental runs. The first received no neutralization during the model runs, the second was treated with Ca(OH)2 and the third was treated with boric acid. The samples were prepared for examination in several different ways. The samples were characteristic of dented intersections and had the general conformation of a thin-walled inner Inconel cylinder within a thick-walled carbon steel cylinder. An original 12-mil inter-cylinder gap had been packed with powdered magnetite. This magnetite had been augmented by further growth of magnetite during the model runs, making the oxide layer considerably thicker than the original 12-mils in some areas of the samples. The cylinders were sectioned and polished perpendicular to their long axes and the resulting surfaces examined

  8. Panama Canal Watershed Experiment- Agua Salud Project

    Science.gov (United States)

    Stallard, Robert F.; Ogden, Fred L.; Elsenbeer, Helmut; Hall, Jefferson S.

    2010-01-01

    The Agua Salud Project utilizes the Panama Canal’s (Canal) central role in world commerce to focus global attention on the ecosystem services provided by tropical forests. The Canal was one of the great engineering projects in the world. Completed in 1914, after almost a decade of concerted effort, its 80 km length greatly shortened the voyage between the Atlantic and Pacific Oceans. An entire class of ships, the Panamax, has been constructed to maximize the amount of cargo that can be carried in a Canal passage. In today’s parlance, the Canal is a “green” operation, powered largely by water (Table 1). The locks, three pairs on each end with a net lift of 27 meters, are gravity fed. For each ton of cargo that is transferred from ocean to ocean, about 13 tons of water (m3) are used. Lake Gatún forms much of the waterway in the Canal transect. Hydroelectricity is generated at the Gatún dam, whenever there is surplus water, and at Madden Dam (completed in 1936) when water is transferred from Lake Alhajuela to Lake Gatún. The Canal watershed is the source of drinking water for Panama City and Colon City, at either end of the Canal, and numerous towns in between.

  9. El grupo de trabajo del agua subterránea: experiencias de participación

    OpenAIRE

    Cisneros de Britto, Julio Cesar de; LÓpez Vera, Fernando

    2008-01-01

    López Vera, F., & Cisneros Britto, J. C. (2008). El Grupo de trabajo del agua subterránea: Experiencia de participación. Ciudadanos y usuarios en la Gestión del Agua. XIII Jornadas de Derecho de Aguas. Editor. Antonio Embid Irujo. Universidad de Zaragoza.

  10. 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.

  11. Evaluation of surrogate boilers for steam generators

    International Nuclear Information System (INIS)

    Steam generator damage in pressurized water reactors is a continuing problem which results from a combination of factors including mechanical design, thermal hydraulics, materials selection, fabrication techniques, water chemistry, and system design and operation. A wide variety of steam generator damage mechanisms has been identified in operating PWRs including intergranular attack, thinning, stress corrosion cracking, erosion, denting, fatigue cracking, pitting, and fretting. Model boilers operated in parallel to the steam generators, i.e., surrogate boilers, may provide a useful tool in the study of these damage mechanisms, their causative factors, and the effects of corrosion actions. To evaluate the applicability of surrogate boilers to such studies, Steam Generator Owners Group I project S111-2 was established. Evaluation of numerous surrogate boiler design alternates led to identification of several possible acceptable approaches. The appropriate surrogate feedwater was identified as plant feedwater. Capability to operate with a tube-side temperature similar to the hot-leg temperature was considered necessary as was the ability to provide mechanical, thermal, and chemical corrosion acceleration. Practical and economically feasible surrogate boiler designs were developed in response to these design requirements

  12. Boiler MACT Technical Assistance (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2012-03-01

    Fact sheet describing the changes to Environmental Protection Act process standards. The DOE will offer technical assistance to ensure that major sources burning coal and oil have information on cost-effective, clean energy strategies for compliance, and to promote cleaner, more efficient boiler burning to cut harmful pollution and reduce operational costs. The U.S. Environmental Protection Agency (EPA) is expected to finalize the reconsideration process for its Clean Air Act pollution standards National Emissions Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters (known as Boiler Maximum Achievable Control Technology (MACT)), in Spring 2012. This rule applies to large and small boilers in a wide range of industrial facilities and institutions. The U.S. Department of Energy (DOE) will offer technical assistance to ensure that major sources burning coal or oil have information on cost-effective clean energy strategies for compliance, including combined heat and power, and to promote cleaner, more efficient boilers to cut harmful pollution and reduce operational costs.

  13. Los conflictos del agua en España

    Directory of Open Access Journals (Sweden)

    Gaspar Mairal Buil

    2005-04-01

    Full Text Available En este trabajo se analizan los conflictos producidos en España en los últimos años en torno a la construcción de grandes presas, tratando de mostrar cómo los afectados han forjado una noción compartida de riesgo y cómo ha surgido un movimiento social con un discurso proyectado hacia ámbitos más globales. Estos hechos se sitúan en relación con la política del agua de la nueva Directiva Marco del Agua (2000 de la Unión Europea para mostrar una insuficiencia, ya que ésta no toma en cuenta el significado cultural de los usos del agua.

  14. Sustancias húmicas en aguas para abastecimiento

    Directory of Open Access Journals (Sweden)

    Miller Camargo Valero

    2011-02-01

    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.

  15. 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.

  16. 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.

  17. Establishment of Optimum Ecological System for Monitoring Boiler Units

    OpenAIRE

    V. I. Nazarov

    2014-01-01

    A mathematical model has been proposed for ecological monitoring of a boiler unit. This model makes it possible to obtain maximum decrease in effluents at minimum reduction in economical operational efficiency of the boiler unit.

  18. 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.

  19. 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 ...

  20. Modelling and predictive control of a drum-type boiler

    OpenAIRE

    Molloy, Barbara

    1997-01-01

    Boilers generate steam continuously and on a large scale. Controlling the boiler process is extremely difficult - it is a highly nonlinear process, its dynamics vary with load and it is strongly multivariable. It is also inherently unstable due to the integrator effect of the drum. In addition, boilers are commonly used in situations where the load can change suddenly and without prior warning. Traditionally, boilers have been controlled by Single-Input, Single-Output (SISO) Proportional ...

  1. Computer simulation of the fire-tube boiler hydrodynamics

    OpenAIRE

    Khaustov Sergei A.; Zavorin Alexander S.; Buvakov Konstantin V.; Sheikin Vyacheslav A.

    2015-01-01

    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.

  2. Experimental installation with pressurized fluidized bed boiler

    Energy Technology Data Exchange (ETDEWEB)

    Dobrzanski, W.; Szwarc, W.; Jurek, K.; Prokop, A. (Politechnika Warszawska (Poland). Instytut Techniki Cieplnej)

    1990-01-01

    Describes a test installation with a 3 MW pressurized fluidized bed boiler. The installation was commissioned at the Institute of Heat Engineering at the Technical University in Warsaw. Predesign assumptions and the lay-out of the installation are given. A schematic diagram of the pressurized (0.6 MPa) fluidized bed boiler with an inner diameter of 1.4 m and a total height of 5.45 m is shown. The fuel feeding system consists of a coal and adsorbent container, two feeders and an air jet pump for pneumatic transport. A water type boiler is integrated into the pressure vessel. Flue gas cyclones are also integrated into a separate pressure vessel. The computerized control system and instrumentation are described. Temperatures, pressures, pressure differences, rotational speeds and the chemical composition of gases are monitored.

  3. 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. PMID:22316768

  4. Aguas subterráneas y humedales en zonas llanas

    OpenAIRE

    Custodio Gimena, Emilio

    2011-01-01

    Los humedales, en sus diversas formas, son importantes manifestaciones del agua en la Naturaleza. Proporcionan importantes servicios ambientales de gran interés para la vida y actividad humanas. Muchos humedales dependen en gran manera o totalmente del agua subterránea. Esto es tanto más cierto cuanto más árido en el territorio y entonces son ecológica y humanamente esenciales. Los humedales aparecen tanto en ambiente montañoso como de llanura. Aquí se da especial consideración a éstos últ...

  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. IMPACTO DEL USO DE AGUA RESIDUAL EN LA AGRICULTURA

    Directory of Open Access Journals (Sweden)

    María E. Guadarrama-Brito

    2015-07-01

    Full Text Available La escasez de agua para uso urbano y la dependencia del riego para la producción agrícola en zonas de rápido crecimiento demográfico, han contribuido a que a nivel internacional aumente el interés en el reuso del agua. Existen riesgos para la salud debido a la presencia de microorganismos y contaminantes como los metales pesados y mutagénicos; los primeros impactan a corto plazo, debido a la contaminación de alimentos que pueden provocar, y los segundos impactan a largo plazo, contribuyendo a la salinización de suelos, lo que detrimenta la productividad para eventualmente derivar en el abandono de terrenos. El reuso del agua residual en la agricultura se ha convertido en una necesidad, la cual debe ser considerada como una alternativa, aunque no ha sido evaluada en los aspectos de contenido y migración de contaminantes, en particular de metales pesados. Algunos de los metales pesados pueden forman parte natural del suelo en cantidades que no resultan tóxicas para los seres vivos; sin embargo, la industrialización ha provocado un aumento de la presencia de estos en las aguas residuales que se utilizan para riego, con el consecuente riesgo para la salud humana y ambiental. El proceso de migración y fijación de contaminantes dentro de un sistema cerrado, dependerá de la capacidad de absorción por parte de los subsistemas agua-suelo-planta, aplicación de tasas de riego (concentración del contaminante, y de la persistencia y toxicidad de los contaminantes. El estudio aquí presentado, evalúa las tasas de migración de metales pesados presentes en un agua de riego, a través del sistema agua-suelo-planta; la evaluación se realizó con material del distrito de riego 028-Tulancingo que recibe aguas residuales de origen industrial, con presencia de Cobre, Manganeso y Zinc para diferentes grados de impacto.

  7. Sensor perfeccionado para la medida de la toxicidad del agua

    OpenAIRE

    Campo García, Francisco Javier del; Mas Gordi, Jordi

    2009-01-01

    La invención se basa en un sensor de medida para la toxidad del agua y consiste en una red de micro-electrodos recubiertos de una membrana y de un biofilm. La red de micro-electrodos puede ser estándar, y es posible su funcionamiento con un único electrodo, aunque ello acarrearía una perdida de sensibilidad. La membrana se usa para evitar la pasivación del electrodo por las bacterias presentes en el agua, y se utilizará en una de las realizaciones posibles "Nafion", aunque también es posible ...

  8. 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...

  9. Tratamiento de agua residual urbana con salinidad variable

    OpenAIRE

    Cort??s Lorenzo, Carmen

    2012-01-01

    Cuando los procesos biol??gicos se aplican al tratamiento de aguas residuales salinas, las altas concentraciones de sales inorg??nicas pueden afectar negativamente a la oxidaci??n de carbono, nitrificaci??n, desnitrificaci??n y eliminaci??n de f??sforo, e incluso pueden causar que los sistemas de tratamiento de aguas residuales no produzcan los rendimientos deseados. La sal puede ocasionar cambios en el metabolismo microbiano, en las propiedades de sedimentaci??n del lodo y de los fl??culo...

  10. Servicios ambientales, agua y economía

    OpenAIRE

    Juan Pablo Ruiz Soto

    2007-01-01

    Los servicios ambientales (SA) asociados a los ecosistemas naturales están seriamente amenazados por acciones locales y por el calentamiento global. El SA asociado al agua y su efecto sobre calidad y cantidad en cuencas hidrográficas aportantes a acueductos y sistemas de riego, son de gran importancia económica y social. Para Bogotá-Colombia el SA de los páramos y bosque nublado en la cuenca de Chingaza representa US$18,2 millones anuales. Para el abastecimiento de agua a la ciudad de Quito-E...

  11. Calidad del agua en marinas pequeñas

    OpenAIRE

    Fuentes Mariles, Óscar Arturo; Osnaya Romero, Javier; Magaña Melgoza, Pedro A.

    1997-01-01

    Se describe un método para calcular la concentración de un contaminante o bien la concentración de oxígeno disuelto (OD) y la demanda bioquímica de oxígeno (DBO) para una marina donde existe un mezclado completo de las sustancias en sus aguas. Los resultados del método permiten analizar la calidad del agua, revisar el tamaño de la marina, evaluar las consecuencias de la descarga de un contaminante, estimar la magnitud de bombeos para reducir la concentración de contaminantes, etc. También se ...

  12. Microorganismos indicadores de la calidad del agua potable en cuba

    OpenAIRE

    Marlen Robert Pullés

    2014-01-01

    Los agentes patógenos transmitidos por el agua constituyen un problema mundial que demanda un urgente control. Las bacterias, virus y parásitos causan enfermedades que varían en severidad. La determinación de microorganismos en el agua de consumo y su concentración proporcionan herramientas de control, indispensables para la toma de decisiones. Los controles rutinarios de todos los microorganismos, potencialmente riesgosos para la salud, resultan difíciles de llevar a cabo, debido a que ello ...

  13. 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 los países de Amé...

  14. Determinación de la absorbancia Uv del agua sucusionada

    OpenAIRE

    Delgado Umaña, Mauricio

    2011-01-01

    Experimento donde se compara el efecto de las sucusiones sobre el agua midiendo la absorbancia Uv a 240, 300, 360 nm. Se encontraron diferencias estadísticamente significativas entre el agua sucusionada y el agua sin sucusionar. Los resultados contradicen los parámetros clásicos de la espectrofotometría al documentar absorbancias negativas. Se plantea que en el proceso de sucusionar el agua se establece una nueva fase del agua. / Abstract. Experiment which compares the effect of succussions o...

  15. Tratamiento de agua residual con elevado contenido de nitratos utilizando reactores biomembrana aireados

    OpenAIRE

    Lolmede, Ph.; Jácome, Alfredo; Vidart, T.; Tejero, I.

    2000-01-01

    Se describe la eliminación conjunta de carbono y nitrógeno de un agua residual, llevada a cabo en reactores biomembrana de laboratorio. El agua residual sintética tuvo una composición similar a la que resultaría de la mezcla, en determinadas proporciones, de agua residual urbana con agua de acuífero rica en nitratos. Se utilizaron dos reactores en paralelo, con igual superficie de soporte pero distinto volumen. Aunque se insufló aire a la biopelícula a través del soporte, el seno del agua ...

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

    OpenAIRE

    B. A. Bayrashevsky; N. P. Borushko

    2014-01-01

    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/∂ξ)Δξ 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 effici...

  17. 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...

  18. 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...

  19. 49 CFR 230.36 - Hydrostatic testing of boilers.

    Science.gov (United States)

    2010-10-01

    ... Appurtenances Pressure Testing of Boilers § 230.36 Hydrostatic testing of boilers. (a) Time of test. The... following any hydrostatic test where the pressure exceeds MAWP. ... 49 Transportation 4 2010-10-01 2010-10-01 false Hydrostatic testing of boilers. 230.36 Section...

  20. Lower price for solar boilers must improve market penetration

    International Nuclear Information System (INIS)

    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

  1. Aspects of new material application for boilers construction

    International Nuclear Information System (INIS)

    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

  2. Central heating: fossil-fired boilers

    Energy Technology Data Exchange (ETDEWEB)

    Blazek, C.F.; Baker, N.R.; Tison, R.R.

    1979-05-01

    This evaluation provides performance and cost data for fossil-fuel-fired steam boilers, hot-water generators, and thermal fluid generators currently available from manufacturers. Advanced-technology fluidized-bed boilers also are covered. Performance characteristics investigated include unit efficiencies, turndown capacity, and pollution requirements. Costs are tabulated for equipment and installation of both field-erected and packaged units. The information compiled in this evaluation will assist in the process of selecting energy-conversion units required for industrial, commercial, and residential applications.

  3. Planning Annual Shutdown Inspection for BFB Boiler

    OpenAIRE

    Sorsa, Tatu

    2014-01-01

    The goal of this thesis was to create an illustrative guidebook of annual inspection planning for BFB boiler to help power plant operator when planning of annual inspection is topical. This thesis was made for Andritz Oy and it is based on inspection reports and experiences of BFB boiler’s maintenance and inspection staff. In this thesis it is shown how to plan an annual inspection for BFB boiler and thesis gives good tools and hints for operator to manage inspection from the beginning ...

  4. The level control of the boiler drum

    OpenAIRE

    He, Chenhui

    2014-01-01

    Level control uses the boiler drum as a controlled object, and uses the level as a controller value. By making sure the level control is attached accurately we get better dynamic performance. I use the cascade control to make the difference to the traditional control. In this thesis, I summarize many problems with the level control in the steam boiler field as the false level phenomenon. I design three methods for the level control process system with different ways. I make the final choi...

  5. Transients in a circulating fluidized bed boiler

    Science.gov (United States)

    Baskakov, A. P.; Munts, V. A.; Pavlyuk, E. Yu.

    2013-11-01

    Transients in a circulating fluidized bed boiler firing biomass are considered. An attempt is made to describe transients with the use of concepts applied in the automatic control theory. The parameters calculated from an analysis of unsteady heat balance equations are compared with the experimental data obtained in the 12-MW boiler of the Chalmers University of Technology. It is demonstrated that these equations describe the transient modes of operation with good accuracy. Dependences for calculating the time constants of unsteady processes are obtained.

  6. Estudio de la calidad del agua de las fuentes de agua subterránea del Alto Palancia

    OpenAIRE

    RAMOS HERNÁNDEZ, RAQUEL

    2014-01-01

    En los últimos tiempos, la calidad del agua se está modificando debido a diferentes sustancias y acciones que la contaminan, y muchas de ellas son responsabilidad de la acción humana, principalmente a través de los vertidos incontrolados de la industria e incluso los municipales y procedentes de actividades como las agrícolas y ganaderas. Como objetivo prioritario para la salud pública está el control sanitario de agua para el consumo humano. Un enfoque integral de evaluación y...

  7. Super Boiler: Packed Media/Transport Membrane Boiler Development and Demonstration

    Energy Technology Data Exchange (ETDEWEB)

    Liss, William E; Cygan, David F

    2013-04-17

    Gas Technology Institute (GTI) and Cleaver-Brooks developed a new gas-fired steam generation system the Super Boiler for increased energy efficiency, reduced equipment size, and reduced emissions. The system consists of a firetube boiler with a unique staged furnace design, a two-stage burner system with engineered internal recirculation and inter-stage cooling integral to the boiler, unique convective pass design with extended internal surfaces for enhanced heat transfer, and a novel integrated heat recovery system to extract maximum energy from the flue gas. With these combined innovations, the Super Boiler technical goals were set at 94% HHV fuel efficiency, operation on natural gas with <5 ppmv NOx (referenced to 3%O2), and 50% smaller than conventional boilers of similar steam output. To demonstrate these technical goals, the project culminated in the industrial demonstration of this new high-efficiency technology on a 300 HP boiler at Clement Pappas, a juice bottler located in Ontario, California. The Super Boiler combustion system is based on two stage combustion which combines air staging, internal flue gas recirculation, inter-stage cooling, and unique fuel-air mixing technology to achieve low emissions rather than external flue gas recirculation which is most commonly used today. The two-stage combustion provides lower emissions because of the integrated design of the boiler and combustion system which permit precise control of peak flame temperatures in both primary and secondary stages of combustion. To reduce equipment size, the Super Boiler's dual furnace design increases radiant heat transfer to the furnace walls, allowing shorter overall furnace length, and also employs convective tubes with extended surfaces that increase heat transfer by up to 18-fold compared to conventional bare tubes. In this way, a two-pass boiler can achieve the same efficiency as a traditional three or four-pass firetube boiler design. The Super Boiler is consequently

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

    Directory of Open Access Journals (Sweden)

    B. A. Bayrashevsky

    2014-06-01

    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. Optimization of Bed Material Consumption in a CFBC Boiler

    Directory of Open Access Journals (Sweden)

    Ashish M. Pullekunnel

    2015-01-01

    Full Text Available The proposed Case-Study is to identify the scope of energy conservation and cost saving through optimization of bed material in a CFBC Boiler during plant start up. The study was undertaken at Abhijeet MADC Nagpur Energy Pvt. Ltd (AMNEPL, a 4X61.5 MW power plant at MIHAN, Khairy Khurd, Hingna, Nagpur. The scope of the study covers the savings achieved during light up of 4X250 TPH boiler and the effect of the application of the proposed method on the energy conservation possibilities and efficiency of boiler operation. The proposed method is an alternative to the conventional boiler light up of a CFBC boiler

  10. Dynamic Boiler Performance:Modelling, simulating and optimizing boilers for dynamic operation

    OpenAIRE

    Sørensen, Kim

    2004-01-01

    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 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 dyna...

  11. 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.

  12. Contaminantes en los cuerpos de agua del sur de Sonora

    Directory of Open Access Journals (Sweden)

    López-Ríos Olga

    2001-01-01

    Full Text Available Objetivo. Ahondar en el conocimiento sobre la incidencia de las actividades productivas del hombre en su medio, y el riesgo potencial que representa el deterioro ambiental para su propia salud y la sobrevivencia de especies animales. Material y métodos. Se utilizó el paquete informático Decision Support System for Industrial Pollution Control DSS (IPC, desarrollado por el Banco Mundial, la Organización Panamericana de la Salud (OPS y la Organización Mundial de la Salud (OMS, que se aplicó a un estudio de caso sobre los cuerpos de agua del sur de Sonora, durante 1996. Resultados. Estos sugieren que existen al menos tres factores que han contribuido a la desaparición de criaderos naturales de pescado y camarón en el municipio de Huatabampo: a la filtración de fertilizantes y pesticidas en las aguas de los drenes; b el asolvamiento producido por el depósito continuo, en el pasado, de agua de cola de la industria, c y la descarga inapropiada de aguas negras en los drenes. El texto completo en inglés de este artículo está disponible en: http://www.insp.mx/salud/index.html

  13. Necesidades de agua en explotaciones de vacuno lechero.

    OpenAIRE

    Callejo Ramos, Antonio

    2014-01-01

    Uno de los principales factores a considerar en el bienestar del ganado lechero es un adecuado acceso al agua como elemento imprescindible para la vida, además de ser necesario para el correcto estado sanitario de los animales y, por tanto, para lograr un adecuado nivel de producción.

  14. 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

  15. Thermal Analysis of Superheater Platen Tubesin Boilers

    Directory of Open Access Journals (Sweden)

    Shahram Falahatkar

    2014-01-01

    Full Text Available Superheaters are among the most important components of boilers and have major importance due to this operation in high temperatures and pressures. Turbines are sensitive to the fluctuation of superheaterstemperature;therefore even the slightest fluctuation in the outlet vapor temperature from the superheaters does damage the turbine axis and fins. Examining the potential damages of combustion in the boilers and components such as the superheaters can have a vital contribution to the progression of the productivity of boiler, turbine and the power plant altogether it solutions are to be fund to improve such systems. In this study, the focus is on the nearest tube set of superheaters to the combustion chamber.These types of tubes are exposed to a wide range ofcombustion flames such that the most heat transfer to them is radiation type.Here, the 320 MW boiler of Isfahan power plant (Iran, the combustion chamber, 16 burners and the platensuperheater tubes were remodeled by CFD technique. The fluid motion, the heat transfer and combustion processes are analyzed. The two-equation turbulence model of k-εis adopted to measure the eddy viscosity. The eddy dissipation model is used to calculate the combustion as well as the P-1 radiation model to quantify the radiation. The overheated zones of superheater tubes and the combustion chamber are identified in order toimprove this problem by applying the radiation thermal shields and knees with porous crust which are introduced as the new techniques.

  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)

    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.

  17. REBURN TECHNOLOGY FOR BOILER NOX CONTROL

    Science.gov (United States)

    The paper reports the progress principally of design-relate phases of a demonstration of reburning on a large cyclone-fired boiler, for which coal is the primary fuel and natural gas, the reburn fuel. Reburn system design criteria are presented, as well as the methodology and res...

  18. The investigation of the locomotive boiler material

    International Nuclear Information System (INIS)

    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)

  19. 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. PMID:18822819

  20. Model boiler studies on deposition and corrosion

    International Nuclear Information System (INIS)

    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)

  1. Radioactivity in drinking water Radiactividad en aguas de consumo

    Directory of Open Access Journals (Sweden)

    Enrique Estrada Vélez

    2011-12-01

    Full Text Available The European Directive on the quality of drinking water in 2003 establishing limits on the values of the radioactive parameters concerning the quality of drinking waters was translated to the Spanish legislation on 2003. These parameters are the gross alpha and beta indexes, tritium content and total indicative dose. The corresponding Spanish Royal Decree came into force in 2008. Not only tap drinking water is subjected to control of radioactivity but also commercial drinking water. Different estudies have been carried out all over the world in both cases. There is a wide range of techniques for the measurement of radioactivity in water. This article describes these techniques and shows when they must be applied. Finally the most important results obtained after analysis in tap water and commercial water are shown both in Spanish and non-Spanish waters. The results show that limits are overtaken in some cases and special care must be taken in order to reduce the levels of radioactivity in drinking water as much as possible.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

  2. 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.

  3. Infrared imaging of fossil fuel power plant boiler interiors

    Science.gov (United States)

    Howard, James W.; Cranton, Brian W.; Armstrong, Karen L.; Hammaker, Robert G.

    1997-08-01

    Fossil fuel power plant boilers operate continuously for months at a time, typically shutting down only for routine maintenance or to address serious equipment failures. These shutdowns are very costly, and diagnostic tools and techniques which could be used to minimize shutdown duration and frequency are highly desirable. Due to the extremely hostile environment in these boilers, few tools exist to inspect and monitor operating boiler interiors. This paper presents the design of a passively cooled, infrared borescope used to inspect the interior of operating boilers. The borescope operates at 3.9 micrometer, where flame is partially transparent. The primary obstacles overcome in the instrument design were the harsh industrial environment surrounding the boilers and the high temperatures encountered inside the boilers. A portable yet durable lens system and enclosure was developed to work with a scanning radiometer to address these two problems by both shielding the radiometer from the environment and by extending the optical train into a snout designed to be inserted into access ports on the sides of the boiler. In this manner, interior images of the boiler can be made while keeping the radiometer safely outside the boiler. The lens views a 40 degree field of view through any 2.5' or larger opening in a foot thick boiler wall. Three of these borescopes have been built, and high resolution images of boiler interiors have been obtained.

  4. 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

  5. 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

  6. Agua y abastecimiento: gestión de cuerpos de agua en la ciudad de San Luis Potosí (México, 1831-1887

    Directory of Open Access Journals (Sweden)

    Yuritzi Hernández Fuentes

    2015-01-01

    Full Text Available Este trabajo plantea una aproximación sobre la gestión de cuerpos de agua y de los sistemas hidráulicos en la ciudad de San Luis Potosí (México, durante el período 1831-1887, a partir de las medidas que tomó el gobierno municipal para atender las necesidades de abastecimiento de agua. El texto analiza dos proyectos importantes en el manejo del agua: el acueducto La Cañada del Lobo y las acciones sobre las derivaciones de aguas a través de La Corriente. Los dos proyectos enfrentaron diversos problemas, entre ellos, el brote de enfermedades asociadas a los cuerpos de agua y la escasez del flujo de líquido a través del acueducto de La Cañada del Lobo.

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

    Directory of Open Access Journals (Sweden)

    Naranjo LC.

    2001-06-01

    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.

  8. Guide to Low-Emission Boiler and Combustion Equipment Selection

    Energy Technology Data Exchange (ETDEWEB)

    Oland, CB

    2002-05-06

    Boiler owners and operators who need additional generating capacity face a number of legal, political, environmental, economic, and technical challenges. Their key to success requires selection of an adequately sized low-emission boiler and combustion equipment that can be operated in compliance with emission standards established by state and federal regulatory agencies. Recognizing that many issues are involved in making informed selection decisions, the U.S. Department of Energy (DOE), Office of Industrial Technologies (OIT) sponsored efforts at the Oak Ridge National Laboratory (ORNL) to develop a guide for use in choosing low-emission boilers and combustion equipment. To ensure that the guide covers a broad range of technical and regulatory issues of particular interest to the commercial boiler industry, the guide was developed in cooperation with the American Boiler Manufacturers Association (ABMA), the Council of Industrial Boiler Owners (CIBO), and the U.S. Environmental Protection Agency (EPA). The guide presents topics pertaining to industrial, commercial, and institutional (ICI) boilers. Background information about various types of commercially available boilers is provided along with discussions about the fuels that they burn and the emissions that they produce. Also included are discussions about emissions standards and compliance issues, technical details related to emissions control techniques, and other important selection considerations. Although information in the guide is primarily applicable to new ICI boilers, it may also apply to existing boiler installations.

  9. Relación entre aguas subterráneas y humedales

    OpenAIRE

    Custodio Gimena, Emilio

    2011-01-01

    Numerosos humedales dependen parcial o totalmente de las aguas subterráneas, así como de la orla de vegetación que los rodea. Ello es tanto más cierto cuanto más árido es el clima. Incluso parte de los aportes más o menos permanentes de agua superficial son agua subterránea en origen. Por lo tanto, la existencia, fluctuación y calidad mineral del agua de esos humedales depende de esas aguas subterráneas, a veces de forma muy específica. La explotación del agua subterránea de los acuíferos ...

  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...

  11. 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. PMID:23573684

  12. 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.)

  13. Investigación sobre tratamientos de aguas seguros en emergencias

    OpenAIRE

    Ruiz García, José Luis

    2016-01-01

    Esta Tesis Doctoral tiene como principal objetivo el obtener una cadena de tratamientos seguros de aguas seriados que nos permita asegurar la calidad de las aguas para consumo humano en caso de emergencias, de tal forma que se minimicen los efectos de acciones hostiles, como sabotajes o actos terroristas, desastres naturales, etc y buscar soluciones adecuadas para garantizar en este caso la salud. Las plantas de tratamientos de aguas existentes comercialmente no aseguran dicha ...

  14. 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.

  15. Study of Corrosion in a Biomass Boiler

    OpenAIRE

    Berlanga, C.; Ruiz, J. A.

    2013-01-01

    Biomass plants, apart from producing energy, help to reduce CO2(g) emissions. One of the biggest problems for their development is superheater corrosion due to fuel corrosivity, especially of the straw. This limits both the temperature of the vapour and also the effectiveness of the plant. In order to know more about the reactions which happen inside the boiler of biomass, thermodynamic calculations using software (HSC Chemistry) have been carried out. Field tests have been carried out in the...

  16. Boiler Modelling of Simple Combustion Processes

    OpenAIRE

    Radovan Nosek; Jozef Jandacka; Andrzej Szlek

    2012-01-01

    The aim of the work is to investigate coal combustion in fixed bed reactor. The experimental results were worked out in the form of approximation functions describing gas composition at the exit of fixed bed reactor. Furthermore, developed functions were applied for defining the boundary conditions at the interface between the fixed bed and gas phase using FLUENT. The simulations of a domestic boiler have been done and the relative effects of different factors in CFD code were evaluated by se...

  17. Incidence of cancer among Norwegian boiler welders.

    OpenAIRE

    Danielsen, T E; Langård, S; Andersen, A.

    1996-01-01

    OBJECTIVES: The cancer incidence among 2957 boiler welders was investigated. The subjects were registered electrical welders from 1942 to 1981. A subcohort of 606 stainless steel welders was studied separately. METHODS: The investigation was a historical prospective cohort study based on a national registry. The loss of follow up was 4.9%. RESULTS: There were 625 deaths (659 expected). There were 269 cancer cases (264 expected). An excess of lung cancer was found; 50 cases v 37.5 expected. Th...

  18. 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

  19. Proyecto de abastecimiento de agua a Herrera de Ibio

    OpenAIRE

    Baldó García, Ignacio

    2015-01-01

    El Trabajo de Fin de Grado realizado es un proyecto del abastecimiento de agua a la población de Herrera de Ibio, municipio de Mazcuerras en la Comunidad Autónoma de Cantabria, España. Se desarrollan todas las partes que componen un abastecimiento de agua: • Captación • Red de tuberías • Depósito La captación se realiza de un manantial de montaña a una cota de a 277 m. Desde ese punto parte la tubería en presión que une la captación con el depósito y tiene una longitud de 1.048 metros. El inf...

  20. DEMANDA DE AGUA PARA USO RESIDENCIAL Y COMERCIAL

    OpenAIRE

    Sandra Gabriela Gómez-Ugalde; Ramón Valdivia-Alcalá; José Alberto García-Salazar; José Saturnino Mora-Flores

    2012-01-01

    La escasez de agua y la sobreexplotación de los mantos acuíferos es un problema de índole ambiental y económico que afecta a la población de Texcoco, Estado de México. Con el objetivo de cuantificar la demanda de agua en el sector doméstico y comercial y las variables que la determinan, ante la problemática de sobreexplotación de los mantos acuíferos de Texcoco, se plantearon dos modelos econométricos de regresión múltiple para determinar si una política de precios es adecuada para la adminis...

  1. Gas mixing processes in nuclear AGR boilers

    International Nuclear Information System (INIS)

    To ensure the safe operation and control of Nuclear (A.G.R.) boilers, 2-D computational models are currently under development. The aim of these models is to predict the flow and temperature distribution of the gas and water side under different operational conditions. These models are based on numerical solutions of the 2-D flow and heat transfer equations for turbulent flow in boilers. Measurements on a closely pitched tube bank with water cooling have demonstrated considerable discrepancies between experimental results and computer predictions. This investigation is therefore being carried out to study theoretically and experimentally the flow and heat transfer process under such a boiler condition. A two dimensional computer model has been developed which incorporates the effects of gas mixing and the interactions between the gas and water side. To cover the complete heat exchanger the governing equations are written in the lumped parameter form. The governing equations have been solved by a computer code written in FORTRAN-77. To test the validity of this model, the computer predictions have been compared with experimental results. Results to date indicate reasonable agreement with experiment and a further refinement of the computer model is indicated. (author)

  2. 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.

  3. 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.

  4. 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

    2003-08-04

    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.

  5. 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.

  6. 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.

  7. A Rule-Based Industrial Boiler Selection System

    Science.gov (United States)

    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.

    2015-09-01

    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, super heaters, air heaters and economizers. The selection of the boiler is very important to the industry for conducting the operation system successfully. The selection criteria are based on rule based expert system and multi-criteria weighted average method. The developed system consists of Knowledge Acquisition Module, Boiler Selection Module, User Interface Module and Help Module. The system capable of selecting the suitable boiler based on criteria weighted. The main benefits from using the system is to reduce the complexity in the decision making for selecting the most appropriate boiler to palm oil process plant.

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

    International Nuclear Information System (INIS)

    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

  9. 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...

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

    DEFF Research Database (Denmark)

    Jensen, Peter Arendt

    to generate ash particles typically in the size range of 50 to 200 μm on biomass suspension fired power plant boilers. A fragmentation rate of fuel particles of 3 have been used to describe both the residual ash formation process in laboratory entrained flow reactors and in full scale boilers.A range...... coal fly ash with a high content of Si and Al isused as an additive on wood fired plants to reduce the problems with alkali salt de-activationof SCR catalysts. While the fundamental chemistry of the additives are well known detailed reaction models of the interaction of salts and additive particles......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...

  11. Parámetros de control de los procesos de regeneración del agua

    OpenAIRE

    Gómez López, Marc

    2008-01-01

    El agua regenerada es aquella agua proveniente de un proceso de depuración a la cual se le aplica un tratamiento adicional (llamado de regeneración) que permite devolverle, parcial o totalmente, el nivel de calidad que tenía antes de ser utilizada. Para que estas aguas constituyan un recurso hídrico a tener en cuenta, es necesario realizar una reutilización planificada que consiste en establecer unas normas de calidad en función del uso final del agua regenerada así como un cor...

  12. Diseño, monitorización y control para un tanque de agua potable

    OpenAIRE

    Fernández Varo, José Antonio

    2005-01-01

    Este proyecto trata de resolver la problemática que existe en la planta de tratamiento de agua de la Central Térmica de Ciclos Combinados (CTCC) de San Adrián del Besós. Debido al poco cloro en el suministro de agua de red, existe la posibilidad de que se produzcan brotes de legionela en el tanque de agua potable. Por este motivo y por la normativa vigente (DOGC núm. 3652/02, RD 140/03), se obliga a tener un control sobre el agua almacenada. A partir de este hecho, se han realizado estudio...

  13. 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...

  14. Comentarios sobre el comercio y mercados del agua subterránea en Canarias

    OpenAIRE

    Custodio Gimena, Emilio

    2011-01-01

    Los mercados del agua subterránea son una interesante posibilidad para la gestión del agua subterránea. Estos mercados han existido desde hace muchas décadas en las islas principales del Archipiélago Canario y han contribuido en parte al importante proceso de desarrollo del último medio siglo. Con variantes de isla a isla y de un lugar a otro, los mercados de agua subterránea son la superposición de tres elementos, el de propiedad del agua a modo de participaciones y acciones que se compran y...

  15. Como funciona una estación depuradora de aguas residuales (EDAR)

    OpenAIRE

    2010-01-01

    El video presenta, en lineas generales, el funcionamiento de una depuradora de aguas residuales urbana convencional de una gran población. En él se describe el funcionamiento tanto de la linea de tratamiento de las aguas residuales como la de los lodos generados en el proceso. Este tipo de plantas implican la aplicación al agua residual de tratamientos tanto desde el punto de vista físico-químico como biológico para obtener un agua tratada que cumpla con la legislación vigente. Asimismo, el t...

  16. Desarrollo de catalizadores para la eliminación de nitratos en agua de consumo humano

    OpenAIRE

    Jaworski, María

    2012-01-01

    Es bien sabido que la contaminación de las aguas puede proceder de fuentes naturales o de actividades humanas. En la actualidad la más importante, sin duda, es la provocada por el hombre: el desarrollo y la industrialización supone un mayor uso de agua. Así, las actividades de agricultura y ganadería, producen vertidos de pesticidas, fertilizantes y restos orgánicos de animales y plantas que contaminan de una forma difusa, pero muy notable las aguas, en particular las subterráneas. Las aguas ...

  17. Subproductos halogenados de la cloración en el agua de consumo público

    OpenAIRE

    Calderón J.; Capell C.; Centrich F.; Artazcoz L.; González-Cabré M.; Villalbí J.R.

    2002-01-01

    Objetivo: La presencia de trihalometanos en el agua de diversas ciudades españolas está demostrada. Este estudio pretende analizar sus concentraciones en el agua de la ciudad de Barcelona. Métodos: Se analizan 151 muestras de agua recogidas durante el año 1998. Los análisis se realizaron en el laboratorio municipal mediante purge and trap y posterior determinación por cromatografía de gases acoplada a espectrofotometría de masas. Los resultados se presentan según el origen del agua: ríos Llob...

  18. Impacto de la producción lechera en la calidad de los cuerpos de agua

    OpenAIRE

    Rafael Arocena; Guillermo Chalar; Carlos Perdomo; Daniel Fabián; Juan Pablo Pacheco; Mauricio González; Vanesa Olivero; Macarena Silva; Verónica Etchebarne

    2013-01-01

    La producción lechera es de las actividades de mayor desarrollo y más contaminantes en Uruguay. A efectos de evaluar y mitigar su impacto en la calidad del agua, se relacionan el modo de producción y de manejo de los efluentes lecheros con diversos indicadores de calidad de los arroyos receptores, en diez microcuencas de un embalse reserva de agua potable para Montevideo. Se analizó el agua subterránea en pozos, el contenido de fósforo del suelo, la calidad del ambiente y del agua de los curs...

  19. Impacto de la producción lechera en la calidad de los cuerpos de agua

    OpenAIRE

    Arocena, Rafael; Chalar, Guillermo; Fabián, Daniel; Pacheco, Juan Pablo; González Piana, Mauricio; Olivero, Vanesa; Silva, Macarena; García, Patricia; Etchebarne, Verónica; Perdomo, Carlos H.

    2012-01-01

    La producción lechera es de las actividades de mayor desarrollo y más contaminantes en Uruguay. A efectos de evaluar y mitigar su impacto en la calidad del agua, se relacionan el modo de producción y de manejo de los efluentes lecheros con diversos indicadores de calidad de los arroyos receptores, en diez microcuencas de un embalse reserva de agua potable para Montevideo. Se analizó el agua subterránea en pozos, el contenido de fósforo del suelo, la calidad del ambiente y del agua de los curs...

  20. 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 ...

  1. 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

    build-up increased with the K-content of the fuel ash and fly ash for grate-fired boilers. For suspension-fired boilers, deposition rates are comparatively low for wood-firing and increase with increasing fuel straw shares. Shedding of deposits occurs by melting during straw-firing on a grate at high......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...... been examined. The firing technology and the fuel utilized influence the fly ash and deposit chemical composition. In grate-firing, K, Cl, and S are enriched in the fly ash compared to the fuel ash, while the fly ash in suspension-firing is relatively similar to the fuel ash. The chemical composition...

  2. Evaluation of surrogate boilers for steam generators. Final report

    International Nuclear Information System (INIS)

    Corrosion in PWR systems is a continuing problem that can result in significant expenditures for inspection, repair, and replacement of steam generators as well as for power replacement during outages. Model boilers operated in parallel to the steam generator may provide a useful tool for monitoring and studying steam generator corrosion and corrosion prevention processes. The potential benefits of such boilers as well as several conceptual boiler design alternatives are described, and approximate costs for fabrication and operation of such systems are presented

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

    OpenAIRE

    Viktor Plaček; Cyril Oswald; Jan Hrdlička

    2012-01-01

    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 t...

  4. Investigations of operation problems at a 200 MWe PF boiler

    OpenAIRE

    Peta Sandile; Toit Chris du; Naidoo Reshendren; Schmitz Walter; Jestin Louis

    2015-01-01

    To minimize oxides of nitrogen (NOx) emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF) and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of glob...

  5. PERANCANGAN pH METER PADA BOILER HRSG BERBASIS ARDUINO

    OpenAIRE

    Yuliza .; Gatot Susanto

    2015-01-01

    Air merupakan zat yang sangat dibutuhkan pada setiap sektor industri, termasuk pemanfaatan untuk kebutuhan energi dan pemanasan. Kebutuhan energi dan pemanasan di industri umumnya dipenuhi dengan cara memanfaatkan steam yang dibangkitkan dalam suatu ketel (boiler). Air yang digunakan sebagai umpan boiler dapat diperoleh dari berbagai sumber yaitu danau, sungai, laut, maupun sumur. Kandungan  air ini sangat mempengaruhi Harga pH pada air umpan boiler, penting untuk diperhatikan untuk mencegah ...

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

    Directory of Open Access Journals (Sweden)

    Lorena Salazar Gámez

    2009-01-01

    Full Text Available 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 Biorreactores de Membrana (BRM, que nace como respuesta de estas exigencias, ya que combina el sistema de fangos activados (FA convencional y la filtración por membrana. Así mismo evalúa comparativamente el proceso de fangos activados y Biorreactor de Membrana a escala piloto en aguas de difícil tratamiento como son los efluentes textiles. Los resultados indican que el proceso de BRM reduce un 82 - 92% de la materia orgánica (DQO, un 95% de los sólidos en suspensión totales (SST, mientras que el proceso de fangos activados reduce un 54- 70% de la materia orgánica (DQO y un 32- 43% de SST.

  7. 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.

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

    OpenAIRE

    Jensen, Peter Arendt

    2015-01-01

    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 reme...

  9. Relocation of boilers to Gulbene, Latvia. Final report

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-09-01

    This report describes the relocation of two coal-fired boilers from Hoeje-Taastrup, Denmark to the City of Gulbene, Latvia and the conversion of one of these boilers to combustion of wood chips. The selection of Gulbene DHE as recipient of the two boilers was made by the Danish Energy Agency. The selection was based on e feasibility study, `Small Boilers Fuel Conversion Study` prepared by the Consulting Engineering Company Birch and Krogeoe/Esbensen in 1994. The recommendations regarding the relocation and conversion of the former coal-fired boilers to use wood chips have been given in a study performed by dk-TEKNIK in the year 1994. The objectives of the Consultant`s project can be summarized as follows: Prequalification of Contractors for the boiler relocation; Preparation of Tender Documents for relocation of two formerly coal-fired boilers placed in Hoeje-Taastrup to Gulbene and conversion of the boilers to combustion of wood fuel; Evaluation and Contracting; Site supervision; Handing-over. The scope of the report describes the final reporting of the boiler relocation to Gulbene. This includes: The process of the relocation; Financial calculations; Experience gained through the project. (EG)

  10. 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.

  11. Thermal power of small scale manually fed boiler

    OpenAIRE

    Janić Todor V.; Igić Saša M.; Dedović Nebojša M.; Pavlović Darijan B.; Turan Jan J.; Sedlar Aleksandar D.

    2015-01-01

    This study reviews test results of the combustion of square soybean straw bales used as fuel in manually fed boiler with nominal thermal power of 120 kWth. The influence of the mass flow rate (180, 265, 350, 435, and 520 kg h-1) of inlet air and flue gas recirculation (0%, 16.5%, and 33%) fed to the boiler furnace was continuously monitored. Direct method was used for determination of the boiler thermal power. Correlation between boiler thermal power and ba...

  12. 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.

  13. Thermomechanical finite element analysis of hot water boiler structure

    OpenAIRE

    Živković Dragoljub S.; Milčić Dragan S.; Banić Milan S.; Milosavljević Peđa M.

    2012-01-01

    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 pipe...

  14. 46 CFR 52.20-17 - Opening between boiler and safety valve (modifies PFT-44).

    Science.gov (United States)

    2010-10-01

    ... ENGINEERING POWER BOILERS Requirements for Firetube Boilers § 52.20-17 Opening between boiler and safety valve (modifies PFT-44). When a discharge pipe is used, it must be installed in accordance with the...

  15. Calderón y las aguas revueltas de Guárdate del agua mansa

    Directory of Open Access Journals (Sweden)

    García Santo-Tomás, Enrique

    2004-04-01

    Full Text Available Guárdate del agua mansa es una de las piezas calderonianas de mayor actualidad. La comedia desarrolla el tema de las apariencias tratado desde una óptica bastante original, en donde el «agua mansa» alude a todas aquellas jóvenes que parecen no tener capacidad de acción, pero que al final son con quienes hay que estar más precavido. Sin embargo, la pieza también nos habla de un fascinante Madrid que seduce a la juventud ya desde el mismo inicio de la pieza, un Madrid visual que entra por los ojos y que conquista al instante.…

  16. Microorganismos indicadores de la calidad del agua potable en cuba

    Directory of Open Access Journals (Sweden)

    Marlen Robert Pullés

    2014-01-01

    Full Text Available Los agentes patógenos transmitidos por el agua constituyen un problema mundial que demanda un urgente control. Las bacterias, virus y parásitos causan enfermedades que varían en severidad. La determinación de microorganismos en el agua de consumo y su concentración proporcionan herramientas de control, indispensables para la toma de decisiones. Los controles rutinarios de todos los microorganismos, potencialmente riesgosos para la salud, resultan difíciles de llevar a cabo, debido a que ello representa, varios días de análisis y costos elevados. Para hacer una evaluación sencilla, económica y fiable de la presencia de patógenos, la vigilancia de la calidad del agua se efectúa mediante indicadores de contaminación, aplicando diferentes enfoques técnicos, cada uno con sus cualidades, defectos y limitaciones. El objetivo de esta revisión fue analizar el enfoque actual existente a nivel nacional e internacional, en relación con los indicadores microbiológicos empleados para la evaluación del agua potable, como elementos clave, y a partir de estos, proponer un esquema de monitoreo en Cuba. Los resultados reflejaron, la alternativa de considerar, la aplicación de un esquema para monitoreo complementario en Cuba, que incluya como indicadores de contaminación del agua potable además de las bacterias, algunos agentes biológicos no considerados en la norma, como los virus y los parásitos. Asimismo indicaron la necesidad de establecer un valor de referencia y definir los microorganismos a emplear en los monitoreos de validación, operativo o verificación. Esta propuesta aportaría importante información para la actualización de la norma cubana sobre la base del conocimiento de los estándares internacionales más reconocidos.

  17. 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. PMID:23552243

  18. 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

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

    Energy Technology Data Exchange (ETDEWEB)

    Tice, D.R.; Platts, N.; Raffel, A.S. [Serco Assurance (United Kingdom); Rudge, A. [British Energy Generation Ltd. (United Kingdom)

    2002-07-01

    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

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

    International Nuclear Information System (INIS)

    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

  1. 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

    ... Bureau of Land Management Notice of Availability of Record of Decision for the Agua Fria National... Agua Fria National Monument and Bradshaw-Harquahala Planning Area, located in central Arizona. The... occupied or used portions of the planning area during prehistoric or historic times. The Agua Fria...

  2. CFD modeling of a boiler's tubes rupture

    International Nuclear Information System (INIS)

    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

  3. Calidad de las aguas superficiales en la Cuenca del Ebro. Tendencias de salinidad, nitrato y fosfato

    OpenAIRE

    Quílez Sáez de Viteri, Dolores

    2011-01-01

    Objetivo General: Caracterización de la calidad de las aguas superficiales de la Cuenca del Ebro y de sus tendencias. Redes de Control de Calidad de Aguas de CHE: - 497 estaciones de control - Datos instantáneos con frecuencias variables - Se han seleccionado 31 estaciones - Relevancia dentro de la Cuenca del Ebro - Predominio del regadío - Disponibilidad de datos

  4. Nuclear reactors with auxiliary boiler circuit

    International Nuclear Information System (INIS)

    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. Control Properties of Bottom Fired Marine Boilers

    OpenAIRE

    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 t...

  6. Selecting Actuator Configuration for a Benson Boiler

    DEFF Research Database (Denmark)

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

    2009-01-01

    This paper addresses the problem of an optimal actuator configuration in an economic perspective. The objective is to minimize the economical cost of operating a given plant. Functionals encapsulating information of the business objectives given the different actuators has been established...... 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...

  7. Reactive leaching of recovery boiler fly ash

    OpenAIRE

    Frigård, Antti

    2016-01-01

    This thesis studied a new CaO leaching method for chloride and potassium removal from recovery boiler fly ash. The concept of this method is to use calcium oxide (or calcium hydroxide) as an additive in the leaching stage in order to ease the subsequent solid-liquid separation. CaO leaching has several benefits over traditional leaching process which uses sulphuric acid as an additive: CaO does not include sulphur that would affect the mills sulphur sodium balance, CaO is readily available in...

  8. 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.

  9. 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.

  10. 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...

  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. NOX EMISSION FACTORS FOR WOOD-FIRED BOILERS

    Science.gov (United States)

    The report gives results of a review of NOx emission data from 14 wood-fired boilers. Types of wood used as fuel included sawdust, chips, shavings, edgings, bark, and other processing residues. Boilers tested ranged in size from 1.5 to 67 MW (4,500 to 200,000 lb steam/hr). The ma...

  13. Quality assurance in fabrication of boilers and pressure vessels

    International Nuclear Information System (INIS)

    Quality assurance for safety and reliability of boilers and pressure vessels is a systematic approach involving various stages right from material identification to final stages of testing, transportation and storage before commissioning. This paper brings out various quality . Assurance aspects to be implemented by manufacturers of boilers and pressure vessels. 1 fig

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

    OpenAIRE

    B. A. Bayrashevsky

    2014-01-01

    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. 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....

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

    Directory of Open Access Journals (Sweden)

    B. A. Bayrashevsky

    2014-08-01

    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.

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

    International Nuclear Information System (INIS)

    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/m3, 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/m2. 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)

  18. 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.

  19. 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.)

  20. 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.

  1. Acuaporinas: proteínas mediadoras del transporte de agua.

    Directory of Open Access Journals (Sweden)

    Julio César Sánchez

    2009-11-01

    Full Text Available Introducción. Todos los organismos vivos están compuestos en su mayoría por agua, siendo ésta fundamental para la homeostasis celular a todo nivel. Por esta razón su transporte a través de las membranas biológicas ha sido siempre un campo de gran interés en la fisiología. La investigación acerca de este tópico se ha incrementado notablemente en los últimos años a partir del descubrimiento de las acuaporinas, las cuales han permitido comprender mejor los mecanismos que la célula utiliza para el control de los flujos de agua a través de la membrana y por ende, la regulación de su osmolaridad interna. Tema general. Hasta el momento se han descrito 11 subtipos de acuaporinas (AQP0-10, las cuales comparten similitudes estructurales y se han relacionado con una gran diversidad de enfermedades en diversos sistemas, desde cataratas hasta diabetes insípida. Objetivo. Se presenta una visión del estado actual del conocimiento acerca de estas importantes proteínas y su relación con diversos procesos fisiológicos y patológicos. Conclusiones. Las acuaporinas son proteínas mediadoras del transporte de agua y las alteraciones en su funcionamiento pueden conducir a una gran diversidad de enfermedades, por lo cual deben ser un objeto prioritario de investigación en el futuro próximo para ayudar a comprender mejor su fisiopatología.

  2. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2005-08-01

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of April 1 to June 30, 2005.

  3. Boiler Materials for Ultrasupercritical Coal Power Plants

    Energy Technology Data Exchange (ETDEWEB)

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

    2003-04-21

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of July 1 to September 30, 2004.

  4. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2005-10-27

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of July 1 to September 30, 2005.

  5. Boiler Materials for Ultrasupercritical Coal Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2006-01-31

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of October 1 to December 30, 2005.

  6. Boiler Materials for Ultrasupercritical Coal Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2006-04-20

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of January 1 to March 31, 2006.

  7. Boiler Materials for Ultrasupercritical Coal Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2006-07-17

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of April 1 to June 30, 2006.

  8. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; W. Mohn; M. Borden; S. Goodstine; I. Perrin

    2004-04-23

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of October 1 to December 30, 2003.

  9. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    K. Coleman; R. Viswanathan; J. Shingledecker; J. Sarver; G. Stanko; W. Mohn; M. Borden; S. Goodstine; I. Perrin

    2004-01-23

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of October 1 to December 30, 2003.

  10. Boiler Materials For Ultrasupercritical Coal Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2006-09-30

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). A limiting factor in this can be the materials of construction. The project goal is to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi). This goal seems achievable based on a preliminary assessment of material capabilities. The project is further intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of July 1 to September 30, 2006.

  11. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2005-04-27

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of July 1 to September 30, 2004.

  12. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2004-10-30

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of April to June 30, 2004.

  13. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; W. Mohn; M. Borden; S. Goodstine; I. Perrin

    2004-07-30

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of April to June 30, 2004.

  14. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman; J. Shingledecker; J. Sarver; G. Stanko; M. Borden; W. Mohn; S. Goodstine; I. Perrin

    2005-01-31

    The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C (1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of conditions prevailing in the boiler. This report provides a quarterly status report for the period of July 1 to September 30, 2004.

  15. 'Boilers' along the southeast coast of Bermuda

    Science.gov (United States)

    2002-01-01

    Along the south shore of Bermuda, waves break continuously along algal/vermetid reefs (composed of algae and molluscs, not coral), forming 'boilers.' Boilers are named because the continuous breaking of waves makes it look as if the sea is boiling. This photograph taken from the International Space Station shows the eastern half of the main islands of Bermuda. Land use is about 6 percent cropland, 55 percent developed and 34 percent rural. Reflective white-colored areas are buildings and other developments surrounded by green areas of vegetation. St. David's Island is also home to the airport, with runways built out into Castle Harbour. Hurricane Erin passed northeast of Bermuda early on September 10 with 115 mile-per-hour winds (a Category 3 storm on the Saffir-Simpson Scale), but causing very minimal damage. Astronauts aboard Space Station Alpha photographed the area on September 14, 2001. By then, the skies had cleared and Erin had become an extratropical low near Newfoundland. Image ISS003-E-5735, was provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center. Additional images taken by astronauts and cosmonauts can be viewed at the NASA-JSC Gateway to Astronaut Photography of Earth.

  16. Estudio del mecanismo de falla de terraplenes debido a la infiltración de aguas lluvias mediante el monitoreo de presiones de poros y contenidos de agua

    Directory of Open Access Journals (Sweden)

    EDWIN GARCÍA

    2007-01-01

    Full Text Available El presente artículo muestra experimentos realizados utilizando modelos a escala para estudiar el proceso de infiltración en terraplenes sometidos a aguas lluvias. Varios modelos a escala fueron construidos usando un suelo arenoso con alto contenido de finos; para aplicar la lluvia artificial y observar el proceso de infiltración del agua se utilizó un tubo de irrigación. Para monitorear los cambios en succión ocasionados por los ciclos de humedecimiento y secado se instalaron dentro del suelo varios sensores de presión de poros, contenido de agua y de desplazamiento en diferentes puntos. El cambio de la presión de poros en el tiempo, el contenido de agua y las relaciones entre las mediciones de presión de poros y desplazamientos del suelo son presentados. Este estudio muestra que el movimiento del suelo en un talud está directamente relacionado con el contenido de agua del suelo y las presiones de poros existentes en él, sugiriendo que por medio del monitoreo de estos dos parámetros es posible predecir fallas locales inducidas por infiltración de aguas lluvias en los taludes.

  17. Uso de plantas acuáticas en el tratamiento de agua y aguas residuales en la Universidad de Matanzas "Camilo Cienfuegos"

    Directory of Open Access Journals (Sweden)

    Damarys Santana Diaz

    2011-05-01

    Full Text Available En el presente trabajo  se analiza el uso de las plantas acuáticas para purificar el agua que se utiliza con fines ornamentales en el Parque de La Juventud de la Universidad de Matanzas "Camilo Cienfuegos", así como para el tratamiento de aguas residuales de dicha instalación. El estudio se realiza a escala de laboratorio y en ambos casos la efectividad del tratamiento se valora a partir de la determinación de parámetros como: demanda química de oxígeno, conductividad, pH, dureza total, dureza de calcio, dureza de magnesio, sólidos totales, fijos y volátiles y coliformes totales y fecales. Se comprobó que las plantas acuáticas pueden disminuir los valores de parámetros indicadores de la calidad del agua a niveles que permitan disminuir la frecuencia con que se cambia el agua de los espejos. Los resultados evidencian que el uso de la planta acuática Nymphaea ampla constituye una alternativa para tratar las aguas y mejorar su calidad con un efecto económico considerable por concepto de ahorro de agua potable.

  18. Matemáticas para la industria del agua

    OpenAIRE

    Izquierdo Sebastián, Joaquín; Pérez, Rafael; Vicente S. Fuertes; Iglesias, Pedro L.; López, Amparo

    2004-01-01

    En el campo del agua existe una enorme diversidad de actividades e intereses y, por tanto, de áreas de trabajo. Los problemas que se plantean en estas áreas son auténticos problemas de ingeniería y, como consecuencia, las ayudas que ciertas técnicas de Matemática Aplicada pueden prestar son realmente importantes. Por un lado, es preciso disponer de herramientas de análisis que permitan realizar simulaciones fiables de los distintos modelos que se plantean analizando diversas configuraciones, ...

  19. La electrolisis salina para el tratamiento de aguas de lastre

    OpenAIRE

    Mesa Salvany, Daniel

    2014-01-01

    El objetivo principal del proyecto, es el desarrollo de equipos electrolíticos para el tratamiento de aguas de lastre, acorde con los requerimientos de la normativa, y los del sector. Para ello, los objetivos específicos, son:  Definición de los requerimientos de la tecnología, teniendo en consideración todas las normativas navales que afecten al proyecto.  Definición de los requerimientos de la tecnología, teniendo en consideración todas las especificaciones técnicas y comerciales qu...

  20. Hormigón en aguas y terrenos agresivos

    Directory of Open Access Journals (Sweden)

    García de Paredes y Gaibrois, Pablo

    1962-09-01

    Full Text Available Not availableEl Dr. Ingeniero H. J. Wierig, del Laboratorio de la Industria del Cemento de Westfalia, ha publicado, en la revista «Bau und Bauindustrie» (núm. 6 de 1961, un interesante artículo acerca de la Preparación del hormigón en aguas y suelos agresivos, de~ cual entresacamos las siguientes notas con la complacencia que supone encontrar totalmente coincidentes, las opiniones del Dr. Wierig con el contenido de las «Recomendaciones» publicadas en la Instrucción sobre hormigón armado H. A. 61 de este Instituto.

  1. Desplazamiento de aceite por agua en medios porosos fracturados vugulares

    Directory of Open Access Journals (Sweden)

    Juana Cruz

    2001-01-01

    Full Text Available Se presentan experimentos llevados a cabo con una celda bidimensional de acrílico, que presenta un medio poroso fracturado vugular. Esta celda tiene seis vúgulos conectados con fracturas, un pozo de inyección y uno de producción. Los primeros resultados indican que el modelo explica de manera confiable los mecanismos que están presentes en los procesos de inyección de agua en yacimientos naturalmente fracturados, en presencia de vúgulos.

  2. Recursos de agua no convencionales en España: estado de la cuestión, 2010

    OpenAIRE

    Olcina Cantos, Jorge; Moltó Mantero, Enrique

    2010-01-01

    Los recursos de agua no convencionales han experimentado un notable desarrollo durante la primera década del presente siglo. El cumplimiento de la Directiva 91/271 de depuración de aguas residuales urbanas y la puesta en marcha del programa AGUA han resultado decisivos para el impulso de la depuración y desalación de aguas en España. Por el contrario, la reutilización de aguas residuales depuradas, aunque cuenta con actuaciones significativas (agricultura, usos recreativos), sigue siendo una ...

  3. Planificación y gestión del agua subterránea: aspectos generales y retos

    OpenAIRE

    Custodio Gimena, Emilio

    2011-01-01

    El agua subterránea, además de ser esencial para el medio ambiente, es un importante recurso y reserva de agua para satisfacer las necesidades humanas. Por ello es susceptible de extracción intensiva, cosa que ya sucede en numerosos acuíferos a nivel mundial. La extracción de agua subterránea modifica el ciclo natural del agua, lo que puede originar importantes cambios en la Naturaleza y alterar las relaciones con las otras fases del ciclo hidrológico. La explotación del agua subterránea p...

  4. 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...

  5. 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...

  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...

  7. 49 CFR 230.20 - Alteration and repair report for steam locomotive boilers.

    Science.gov (United States)

    2010-10-01

    ... boilers. (a) Alterations. When an alteration is made to a steam locomotive boiler, the steam locomotive... steam locomotive boiler, the steam locomotive owner and/or operator shall file with the FRA Regional... the boiler. Whenever welded or riveted repairs are performed on stayed portions of a steam...

  8. El cultivo de alfalfa utilizando agua de perforación, agua residual urbana y precipitaciones The cultivation of alfalfa using artesian well water, urban wastewater and rainfall

    Directory of Open Access Journals (Sweden)

    José O. Plevich

    2012-12-01

    Full Text Available El objetivo de este trabajo fue analizar la producción de biomasa aérea, la eficiencia del uso de agua y el valor nutritivo de alfalfa cultivada aplicando riego con agua residual urbana, agua de perforación y un testigo (precipitaciones, en el Campus de la Universidad Nacional de Rio Cuarto (Córdoba-Argentina. Los tratamientos de riego tuvieron un efecto positivo sobre la producción de biomasa aérea obteniéndose un 24% más de producción de biomasa que en la situación de secano (precipitaciones. Entre los tratamientos con riego también se manifestaron diferencias estadísticamente significativas. La alfalfa regada con aguas residuales urbana supero en un 19% a la cultivada con agua de perforación. La eficiencia del uso del agua por parte del cultivo se incrementó cuando el riego se realizó con aguas residuales urbanas. Además, se determinó que la alfalfa regada con agua residual, supera los valores nutritivos del cultivo que crece en condiciones sin riego; encontrándose 39% más de proteínas, 14% más de digestibilidad e igual porcentaje de energía metabólica. Se puede concluir que el agua residual urbana representa otra posible fuente de agua, factible de ingresar al suelo y estar a disposición para el cultivo de alfalfa.The objective of this study was to analyse the production of alfalfa biomass, the efficiency of water use and the nutritional value of forage, inside an irrigation structure of an experimental facility that uses treated urban wastewater, artesian well water and rainfall, at the campus of the Universidad National de Rio Cuarto (Córdoba-Argentina. The irrigation treatment had a positive effect on the production of biomass of alfalfa. On an average 24% increase in production was observed when compared to dry-land farming. Regarding the quality of the irrigation water, statistical differences in production were observed, the irrigation with urban wastewater produced 19% more than that of well water. The

  9. 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.

  10. Evaluation of conditions of SNCR in small boilers

    International Nuclear Information System (INIS)

    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

  11. Modeling operation mode of pellet boilers for residential heating

    International Nuclear Information System (INIS)

    In recent years the consumption of wood pellets as energy source for residential heating lias increased, not only as fuel for stoves, but also for small-scale residential boilers that, produce hot water used for both space heating and domestic hot water. Reduction of fuel consumption and pollutant emissions (CO, dust., HC) is an obvious target of wood pellet boiler manufacturers, however they are also quite interested in producing low- maintenance appliances. The need of frequent maintenance turns in higher operating costs and inconvenience for the user, and in lower boiler efficiency and higher emissions also. The aim of this paper is to present a theoretical model able to simulate the dynamic behavior of a pellet boiler. The model takes into account many features of real pellet boilers. Furthermore, with this model, it is possible to pay more attention to the influence of the boiler control strategy. Control strategy evaluation is based not only on pellet consumption and on total emissions, but also on critical operating conditions such as start-up and stop or prolonged operation at substantially reduced power level. Results are obtained for a residential heating system based on a wood pellet boiler coupled with a thermal energy storage. Results obtained so far show a weak dependence of performance in terms of fuel consumption and total emissions on control strategy, however some control strategies present some critical issues regarding maintenance frequency

  12. MSWI Boiler Ashes: Production and Quality Through the Horizontal Section of a Boiler

    DEFF Research Database (Denmark)

    Allegrini, Elisa; Boldrin, Alessio; Astrup, Thomas Fruergaard

    SUMMARY: the central role of waste-to-energy (WtE) plants in Denmark asks for a deep knowledge of all different residues produced by these facilities. The main objective of solid residues characterization is the optimization of their management system. In this study we present the results of the...... first phase of a wider study about the solid residues produced at the heat recovery system (boiler) of a waste incineration plant. The characterization was carried out not on the total output of the boiler but on the different solid residues produced at ten different horizontal sections. The aim was to...... characterize the different streams in order to identify differences that can justify potentially different utilization/disposal options. First results showed differences between sections in terms of chemical composition, leaching behavior and content of dioxins, but additional results are needed to cope with...

  13. EFECTOS REDISTRIBUTIVOS DE LAS TARIFAS DE AGUA POTABLE

    Directory of Open Access Journals (Sweden)

    VÉLEZ GOMEZ LUIS DIEGO

    2010-05-01

    Full Text Available Aunque para Colombia la situación no es tan dramática, se avizora un problema de cobertura y escasez de agua potable para los niveles más desprotegidos de la población, en razón de su incapacidad de pago. La consecuencia inmediata es una acentuación de los índices de pobreza y de su manifestación más clara: el hambre. Este trabajo pretende mostrar que los niveles de pobreza son muy sensibles al precio de los servicios públicos domiciliarios, entre ellos, del agua, y atribuye a las fallas de inclusión y exclusión de los subsidios parte del grueso número de personas que hoy están por debajo de la línea de pobreza, aunque ésta no sea la única causa. Dada, entonces, la prominencia de las empresas de servicios públicos en la economía, los gobiernos tienen la obligación de resolver parte del difícil problema de equidad a través de las tarifas, sin dejar de garantizar la sostenibilidad económica de los proveedores del recurso.

  14. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman

    2002-10-15

    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

  15. 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

  16. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan

    2002-04-15

    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), and up to 5500 psi with emphasis upon 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 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

  17. COAL COMBUSTION EFFICIENCY IN CFB BOILER

    Institute of Scientific and Technical Information of China (English)

    Hairui Yang; Guangxi Yue

    2005-01-01

    The carbon content in the fly ash from most Chinese circulating fluidized bed (CFB) boilers is much higher than expected, thus directly influencing the combustion efficiency. In the present paper, carbon burnout was investigated both in field tests and laboratory experiments. The effect of coal property, operation condition, gas-solid mixing, char deactivation,residence time and cyclone performance are analyzed seriatim based on large amount of experimental results.A coal index is proposed to describe the coal rank, defined by the ratio of the volatile content to the coal heat value, is a useful parameter to analyze the char burnout. The carbon content in the fly ash depends on the coal rank strongly. CFB boilers burning anthracite, which has low coal index, usually have high carbon content in the fly ash. On the contrary, the CFB boilers burning brown coal, which has high coal index, normally have low carbon content.Poor gas-solid mixing in the furnace is another important reason of the higher carbon content in the fly ash. Increasing the velocity and rigidity of the secondary air could extend the penetration depth and induce more oxygen into the furnace center. Better gas solid mixing will decrease the lean oxygen core area and increase char combustion efficiency.The fine char particles could be divided into two groups according to their reactivity. One group is "fresh" char particles with high reactivity and certain amount of volatile content. The other group of char particles has experienced sufficient combustion time both in the furnace and in the cyclone, with nearly no volatile. These "old" chars in the fly ash will be deactivated during combustion of large coal particles and have very low carbon reactivity. The generated fine inert char particles by attrition of large coal particles could not easily burn out even with the fly ash recirculation. The fraction of large coal particles in coal feed should be reduced during fuel preparation process.The cyclone

  18. BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

    Energy Technology Data Exchange (ETDEWEB)

    R. Viswanathan; K. Coleman

    2002-07-15

    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

  19. Failure of marine boiler tube: A case history

    Directory of Open Access Journals (Sweden)

    V. A. Dere

    1963-01-01

    Full Text Available An interesting case of marine boiler tube failure is described. As a result of local overheating, a ballooning burst occurred in a boiler tube. Evidence showed that a temperature of over 1600/degree/F (87/degree/C had been reached before rupture. The presence of a thin film of copper arising from the auxiliary equipments of the boiler, caused pittings in the metal. failure was thus attributed to local overheating accelerated by an inner deposit of heat insulating scale.

  20. 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

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

    International Nuclear Information System (INIS)

    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)

  2. Extending EMMS-based models to CFB boiler applications

    Institute of Scientific and Technical Information of China (English)

    Bona Lu; Nan Zhang; Wei Wang; Jinghai Li

    2012-01-01

    Recently,EMMS-based models are being widely applied in simulations of high-throughput circulating fluidized beds (CFBs) with fine particles.Its use for low flux systems,such as CFB boiler (CFBB),still remains unexplored.In this work,it has been found that the original definition of cluster diameter in EMMS model is unsuitable for simulations of the CFB boiler with low solids flux.To remedy this,we propose a new model of cluster diameter.The EMMS-based drag model (EMMS/matrix model) with this revised cluster definition is validated through the computational fluid dynamics (CFD) simulation of a CFB boiler.

  3. 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...

  4. 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...

  5. 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...

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

    OpenAIRE

    Solberg, Brian; Karstensen, Claus M. S.; Andersen, Palle; Pedersen, Tom Søndergård; Hvistendahl, Poul U.

    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...

  7. Steam boiler burning wood 60t/h.

    OpenAIRE

    Umýsa, Radovan

    2011-01-01

    This diploma thesis deals constructional and calculation design of the steam boiler 60t/h of clean burning wood. For the parameters of the stoichiometric calculations are carried out and enthalpy calculations of combustion and air. The collected data is then made It a diagram of air and flue gas. The following are the calculations with the heat balance calculations of losses and determination of the boiler thermal efficiency of the boiler. It is made of the combustion chamber design and its t...

  8. Modular approach for modeling a multi-energy district boiler

    OpenAIRE

    Eynard, Julien; Grieu, Stéphane; Polit, Monique

    2011-01-01

    The present paper deals with the modeling of a district boiler (city of La Rochelle, west coast of France), as part of the OptiEnR research project. This "multi-energy" boiler supplies domestic hot water and heats residential and public buildings, using mainly wood and sometimes fuel or gas if necessary. The OptiEnR research project focuses on optimizing the performance of the boiler. Its main objective is to minimize the use of fossil energy, stocking renewable energy during low-demand perio...

  9. El abastecimiento de agua en las ciudades del Mediterráneo

    Directory of Open Access Journals (Sweden)

    Pulido Bosch, Antonio

    1999-10-01

    Full Text Available Not available.En las ciudades costeras, como en las no costeras, una buena parte del agua captada se pierde en las redes de distribución; además, el usuario no es siempre consciente de la necesidad de ahorrar al máximo este recurso. Hay que tener en cuenta igualmente que el agua residual, una vez depurada, puede constituir un buen recurso que permite satisfacer parte de la demanda y a la vez reducir los problemas planteados por la eliminación de las aguas usadas directamente en el mar. Las soluciones a los problemas de la escasez de agua deben pasar por el ahorro de agua, la reducción de las pérdidas en las redes de distribución, la reutilización y, a veces, la importación de agua de lugares excedentarios, sin olvidar la desalación de las aguas saladas o salobres. El desarrollo sostenible exige una planificación partiendo de la demanda máxima admisible, compatible con el respeto a los equilibrios ambientales; esto puede exigir la limitación del crecimiento de las ciudades, lo que no es siempre aceptado. Por último, se comentan dos ejemplos, uno representativo de una ciudad donde no existe gran competencia por el agua entre la demanda agrícola y la demanda urbana (Almería; y el otro relativo a una ciudad donde el turismo de verano aumenta casi diez veces la población, con una agricultura para la que la demanda de agua alcanza en verano también su máximo (Almuñécar, Granada.

  10. Control Properties of Bottom Fired Marine Boilers

    DEFF Research Database (Denmark)

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

    2005-01-01

    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 of load whereas gain variations at the crossover frequency are small. Furthermore the interactions in the system prove not to be negligible and a subsequent controller design should take this into account using either Multiple input Multiple output control or Single input Single output controllers...

  11. 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

  12. Failure Analysis Of Industrial Boiler Pipe

    International Nuclear Information System (INIS)

    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

  13. 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 analysis...... of the potential benefit from using a multivariable control strategy in favor of the current strategy based on single loop theory is carried out and proves that the interactions in the system are not negligible and a subsequent controller design should take this into account. A design using dynamical...... decoupling showed substantial improvement compared to a decentralized scheme based on sequential loop closing. Similar or better result is expected to be obtainable using a full Multiple input Multiple output scheme. Furthermore closed loop simulations, applying a linear controller to the nonlinear plant...

  14. Film-forming amines in shell boilers

    Energy Technology Data Exchange (ETDEWEB)

    Topp, Holger [Astrium RST Rostock GmbH, Rostock (Germany); Hater, Wolfgang [BK Giulini, Ludwigshafen (Germany); BKG Water Solutions, Ludwigshafen (Germany); Bache, Andre de [BK Giulini, Ludwigshafen (Germany); Kolk, Christian zum [BKG Water Solutions, Ludwigshafen (Germany)

    2012-01-15

    Studies were conducted with the aim of providing answers to important questions concerning the use of film-forming amines in steam generators. Tests were carried out in test steam generators under controlled conditions to study the three following application areas: the influence of film-forming amines on boiling behavior and heat transfer, the influence of film-forming amines on oxidic protective film formation, and the influence of film-forming amines on critical operating conditions. In the experiments water treatment with trisodium phosphate (which is normally used with shell boilers) was compared with treatment with film-forming amines. In all three areas the treatment with film-forming amines achieved comparable or better results than the treatment with trisodium phosphate. (orig.)

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

    OpenAIRE

    J. O. ODIGURE; A. S. ABDULKAREEM; E. T. ASUQUO

    2005-01-01

    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, demi...

  16. 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

  17. Compuestos orgánicos presentes en aguas de escombreras de carbón.

    OpenAIRE

    Llamas Borrajo, Juan F.; Canoira López, Laureano; García-Martínez, Mª Jesús; Ortega Romero, Marcelo; Llamas Lois, Alberto; Diaz Bautista, Maria Aranzazu

    2008-01-01

    Se ha realizado un estudio de la influencia de las aguas acidas de mina en la movilización de los hidrocarburos policidicos aromáticos (PAHs) presentes en las escombreras de carbón. Se observa como dichas aguas acidas disuelven preferentemente a los PAHs de menor peso molecular. También se ha realizado un análisis de riesgos que indica que existe un riesgo real por uso y consumo, en el interior de las viviendas, del agua subterránea. Por último, se han establecido las bases para una técnica p...

  18. Opciones de valorización de lodos de distintas estaciones depuradoras de aguas residuales

    OpenAIRE

    Colomer Mendoza, Francisco José; GALLARDO IZQUIERDO, ANTONIO; Fabián ROBLES MARTÍNEZ; Bovea Edo, María Dolores

    2010-01-01

    La legislación actual en la Unión Europea recomienda que los lodos de depuradora de aguas residuales se utilicen como fertilizante. Sin embargo, la presencia de metales pesados puede limitar esta aplicación, lo cual es más probable en caso de lodos de aguas residuales industriales. Por lo tanto, una segunda opción es la recuperación energética de los lodos. En el presente trabajo, se han analizado lodos digeridos procedentes de siete distintas depuradoras de aguas residuales españ...

  19. USO DE AGUA, POTENCIAL HÍDRICO Y RENDIMIENTO DE CHILE HABANERO (CAPSICUM CHINENSE JACQ.)

    OpenAIRE

    Wendy C. Quintal Ortiz; Alfonzo Pérez-Gutiérrez; Luis Latournerie Moreno; Cesar May-Lara; Esaú Ruiz Sánchez; Armando J. Martínez Chacón

    2012-01-01

    En las plantas el agua constituye típicamente de 80 a 95 % de la masa de los tejidos en crecimiento, donde desempeña funciones esenciales. La baja disponibilidad de agua en el suelo provoca el estrés abiótico de mayor incidencia en el crecimiento vegetal que en los sistemas agrícolas representa en pérdidas económicas. Es importante entonces estimar los requerimientos hídricos de los cultivos para mejorar su potencial productivo y el uso del agua. En este estudio se evaluó el efecto de cinco n...

  20. ECOFICCIONES E IMAGINARIOS DEL AGUA Y SU IMPORTANCIA PARA LA MEMORIA CULTURAL Y LA SOSTENIBILIDAD

    OpenAIRE

    Eloy Martos Núñez; Alberto Martos García

    2013-01-01

    La cultura del agua debe ser vinculada de forma especial a las manifestaciones del patrimonio cultural intangible de los pueblos, como las tradiciones orales o escritas, la simbología o los rituales, que conforman lo que llamamos los Imaginarios del Agua. Estos deben ser analizados y deconstruidos a la luz de los nuevos paradigmas, como la hermenéutica y la ecocrítica. De este modo, la mitografía ayuda a perfilar el significado profundo de la cultura del agua ante las nuevas demandas medioamb...

  1. Análisis comparativo de indicadores de la calidad de agua superficial

    OpenAIRE

    Jiménez Jaramillo, Mario Alberto; Vélez Otálvaro, María Victoria

    2009-01-01

    En este trabajo se hace un análisis comparativo de indicadores de calidad de agua como un acercamiento a la caracterización general de la calidad de las aguas superficiales de la cuenca de la quebrada Doña María localizada en jurisdicción del Área Metropolitana del Valle de Aburrá (AMVA) y de la Corporación Autónoma Regional del Centro de Antioquia (CORANTIOQUIA). Para ello se ha empleado el índice de calidad de agua, WQINSF, propuesto por la National Sanitation Foundation (NS...

  2. Biomateriales sorbentes para la limpieza de derrames de hidrocarburos en suelos y cuerpos de agua

    OpenAIRE

    Ortíz González, Diana Paola; Fonseca, Fabio Andrade; Rodríguez Niño, Gerardo; Montenegro Ruiz, Luis Carlos

    2010-01-01

    Este estudio esta encaminado a identificar y evaluar materiales orgánicos naturales que puedan ser utilizados como sorbentes en las operaciones de limpieza de derrames de hidrocarburos tanto en suelos como en cuerpos de agua. Se evaluó la capacidad de sorción de tres materiales: fibra de caña, fibra de coco y buchón de agua, con tres hidrocarburos: 35, 30 y 25°API, y dos tipos de agua: destilada y marina artificial, adaptando la norma ASTM F-726 y siguiendo la metodología sugerida por el pr...

  3. Durabilidad de Hormigones con adición de lodos secos de depuradora de aguas residuales

    OpenAIRE

    Albareda Parés, Francesc

    2003-01-01

    En esta tesina se estudia la influencia en la durabilidad del hormigón el hecho de incorporar al mismo, como adición, fangos secos de la depuradora de aguas residuales de Sabadell (Barcelona). Se plantea la posibilidad de utilizar los lodos como adición más en el hormigón, para conseguir inertizarlos y darles una reutilización. Para evaluar la durabilidad del hormigón se han realizado cinco ensayos: humeda-sequedad con agua potable, ataque con disolución de sulfatos, ataque con agua de mar...

  4. ELIMINACIÓN CATALÍTICA DE NITRATOS EN CONTINUO EN AGUAS NATURALES

    OpenAIRE

    Franch Martí, Cristina

    2011-01-01

    La contaminación por nitratos de las aguas naturales es un problema que afecta a gran parte de zonas agrícolas y ganaderas. Para reducir los nitratos presentes en dichas aguas se han propuesto varias técnicas, la mejor de las cuales podría ser desde un punto de vista medioambiental la reducción catalítica de nitratos a nitrógeno. En este sentido, en esta tesis se ha utilizado la técnica antes nombrada para eliminar nitratos de aguas naturales utilizando un reactor en continuo. Para ello, s...

  5. Parametrización oceanográfica en índices de calidad del agua

    OpenAIRE

    de Armas Tápanes, J.; Rodríguez Romero, R.; Zayas Suárez, D.; Fernández Vila, L.J.; López García, D.

    2010-01-01

    En el trabajo se discute la polémica situación actual de la utilización de Índices de Calidad del Agua para ecosistemas marinos, sobre la base del análisis de 20 Índices de Calidad del Agua (ICA) basados en variantes de la magnitud media, ya sea aritmética simple, ponderada o geométrica: seis norteamericanos, siete colombianos, un mexicano, cuatro holandeses y dos cubanos, y la utilización en ellos, de 31 parámetros físico-químicos (28 en agua y tres en sedimentos). Se evidenció, ...

  6. Condensation system with seawater in the Royal Solaris Hotel of Cancun; Sistema de condensacion con agua salada en el hotel Royal Solaris de Cancun

    Energy Technology Data Exchange (ETDEWEB)

    Herrero, Juan F.; Hernandez A, David [Celsol, S.A. de C.V., Nuevo Leon (Mexico)

    1999-07-01

    After performing a technical study, during the month of September of 1998, in the facilities of Villas Solaris, S.A. de C.V., specifically in the Royal Solaris Hotel, towers Royal and Caribe, important opportunities of saving were found, which were evaluated technical and economically to be able to present to Villa Solaris, S.A. of C.V., an energy saving project highly profitable that allows to obtain great economic benefits, a better service for the hosts and an important step to the reduction of the operative expenses (energy), that guaranteed the future competitiveness of the hotel in the zone. The base of the energy saving opportunities is the substitution of the air conditioning equipment, since the installed ones in the Hotel, are very deficient equipment (piston in Caribbean Tower) or because of by International ecological Norms they will be obsolete in short time (centrifugal R-11 Torre Royal). In addition the service machine area of the Hotel was centralized in a single site. The substitution measure of the air conditioning systems, contemplated the installation of centrifugal equipment of high efficiency (0.65kW/Ton at full load) cooled with brackish water, that is a very abundant resource in the zone and does not represent any cost for the Hotel. The waste heat of the refrigeration machines is contemplated to be used to preheat the service water and the swimming pool water by means of heat exchange equipment. In order to arrive to the desired optimal temperatures the advantage of the installation of the already existing in the Hotel thermo solar systems was taken into consideration. When implementing this global system, the use of cooling towers was eliminated, that was the equipment that cools the condensation water of the air conditioning equipment. In addition the use of the steam boilers was eliminated that made the function of warming up the service water, reason why an important saving of fuel was generated. [Spanish] Despues de haber realizado un

  7. 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...

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

    International Nuclear Information System (INIS)

    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

  9. 46 CFR 61.05-15 - Boiler mountings and attachments.

    Science.gov (United States)

    2010-10-01

    ....05-10. (b) Each stud or bolt for each boiler mounting that paragraph (c) of this section requires to... nozzles and a satisfactory internal examination of these mountings or valves and their attaching...

  10. Numerical Analysis of the Factors about Combustion Stability on Boiler

    Directory of Open Access Journals (Sweden)

    Yan Weiping

    2012-06-01

    Full Text Available Through the research of the coal pulverized catches fire and steadily combustion mechanism and the numerical Simulation of the 300MW Tangentially Pulverized Coal Fired Boiler by Coal-fire software?combine the operating data of the boiler, establish the corresponding relation between the result of numerical simulation and combustion stability. The result indicates that the higher volatile matter, lower content of ash and moisture of the coal, it helps the coal pulverized air current to catch fire . More fineness coal pulverized is favorable to catch fire. When boiler load reduced, it will influence the characteristic" lighted by itself " of the tangentially pulverized coal fired boiler, and it will cause combustion unstably.

  11. Investigation of Air Inflow Distribution Nature in Boiler Gas Flue

    OpenAIRE

    V. I. Nazarov; A. A. Khadorik

    2014-01-01

    The paper presents results of mathematical investigations on distribution of air inflows in the ТП-87 boiler gas flue. Experiments have been executed on the basis of programming «Flow Vision» complex.

  12. 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...

  13. TRD, technical codes and instructions on steam boilers

    International Nuclear Information System (INIS)

    Condensed edition informing about layout and applications of the TRDs, materials, manufacture and dimensioning, calculations, equipment and installation, testing and operation, and boilers of groups I, II and III. (DG)

  14. 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)

  15. Seismic model of the nuclear boiler SPX2

    International Nuclear Information System (INIS)

    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

  16. Methods of Nitrogen Oxide Reduction in Pellet Boilers

    OpenAIRE

    Žandeckis, A; Blumberga, D; Rochas, C.; Veidenbergs, I; Siliņš, K

    2010-01-01

    The main goal of this research was to create and test technical solutions that reduce nitrogen oxide emissions in low-capacity pellet boiler. During the research, wood pellets were incinerated in a pellet boiler produced in Latvia with a rated capacity of 15 kW. During the research two NOx emission reduction methods were tested: secondary air supply in the chamber and recirculation of flue gases. Results indicated a drop of NOx concentration only for flue gas recirculation methods. Maximum re...

  17. Installations of SNCR on bark-fired boilers

    International Nuclear Information System (INIS)

    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 NOx reduction vary between the installations depending on boiler, fuel and operation. The emissions are between 45 and 100 mg NO2/MJ fuel input and the NOx reduction rates are in most installations between 30 and 40 %, the lowest 20 and the highest 70 %. 13 figs, 3 tabs

  18. 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.

  19. Numerical Analysis of the Factors about Combustion Stability on Boiler

    OpenAIRE

    Yan Weiping; Gao Yang; Li Jun

    2012-01-01

    Through the research of the coal pulverized catches fire and steadily combustion mechanism and the numerical Simulation of the 300MW Tangentially Pulverized Coal Fired Boiler by Coal-fire software?combine the operating data of the boiler, establish the corresponding relation between the result of numerical simulation and combustion stability. The result indicates that the higher volatile matter, lower content of ash and moisture of the coal, it helps the coal pulverized air current to ca...

  20. FLAME MONITORING IN POWER STATION BOILERS USING IMAGE PROCESSING

    OpenAIRE

    K.Sujatha; VENMATHI, M.; Pappa, N.

    2012-01-01

    Combustion quality in power station boilers plays an important role in minimizing the flue gas emissions. In the present work various intelligent schemes to infer the flue gas emissions by monitoring the flame colour at the furnace of the boiler are proposed here. Flame image monitoring involves capturing the flame video over a period of time with the measurement of various parameters like Carbon dioxide (CO2), excess oxygen (O2), Nitrogen dioxide (NOx), Sulphur dioxide (SOx) and Carbon monox...

  1. Exergy Analysis of Boiler In cogeneration Thermal Power Plant

    OpenAIRE

    Sarang j gulhane

    2013-01-01

    – Effective energy utilization and its management for minimizing irreversibility has made human to look for efficient energy consumption & conversion. Based on several research activity and local power plant experience some key observation has made and is presented in this paper The aim of this paper is to be find out amount and source of irreversibilities gererated in boiler of 35 TPH boiler in 6 MW captive power plant so that any process in the system that having largest energy destruction...

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

    OpenAIRE

    Juravliov A.A.; Sit M.L.; Poponova O.B.; Sit B.B.; Zubatii A.L.

    2006-01-01

    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.

  3. Online energy balance calculations for a BioGrate boiler

    OpenAIRE

    Sarkar, Palash

    2014-01-01

    The rise in the demand of an alternative source of energy that can substitute the depleting fossil fuel has introduced new challenges in process industries. Today, biomass fuel is increasingly used as a renewable source of energy used for power production. The BioGrate boiler is one of the latest technologies that utilize biomass fuel for power production. These boilers need to cater to the power demand of the market without any interruptions in their operations. However, the heat content of ...

  4. CFD Studies on Multi Lead Rifled [MLR] Boiler Tubes

    OpenAIRE

    Dr T C Mohankumar

    2013-01-01

    This paper reports the merits of multi lead rifled [MLR] tubes in vertical water tube boiler using CFD tool. Heat transfer enhancement of MLR tubes was mainly taken in to consideration. Performance of multi lead rifled tube was studied by varying its influencing geometrical parameter like number of rifling, height of rifling, length of pitch of rifling for a particular length. The heat transfer analysis was done at operating conditions of an actual coal fired water tube boiler situated at Apo...

  5. 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.

  6. Characteristics of boiler installation of a transport vessel with boilers KAV 2,5/7 at working on black oil and at a water-fuel emulsion

    OpenAIRE

    Sen Leonid Illarionovich; Sumenkov Vyacheslav Mikhailovich

    2011-01-01

    The design characteristics of boilers of КАV type working on black oil and water-fuel emulsion are resulted and discussed. For KAV 2,5/7 boiler the use of water-fuel emulsion leads to improvement of economic efficiency of the boiler with torches of different types in comparison with the use of commercial grade fuel.

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

    International Nuclear Information System (INIS)

    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)

  8. Feasibility of recovery boiler in paper and pulp industry

    International Nuclear Information System (INIS)

    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)

  9. Boiler tube corrosion characterization with a scanning thermal line

    Science.gov (United States)

    Cramer, K. Elliott; Jacobstein, A. Ronald; Reilly, Thomas L.

    2001-03-01

    Wall thinning due to corrosion in utility boiler waterwall tubing is a significant operational concern for boiler operators. Historically, conventional ultrasonics has been used for inspection of these tubes. Unfortunately, ultrasonic inspection is very manpower intense and slow. Therefore, thickness measurements are typically taken over a relatively small percentage of the total boiler wall and statistical analysis is used to determine the overall condition of the boiler tubing. Other inspection techniques, such as electromagnetic acoustic transducer (EMAT), have recently been evaluated, however they provide only a qualitative evaluation - identifying areas or spots where corrosion has significantly reduced the wall thickness. NASA Langley Research Center, in cooperation with ThermTech Services, has developed a thermal NDE technique designed to quantitatively measure the wall thickness and thus determine the amount of material thinning present in steel boiler tubing. The technique involves the movement of a thermal line source across the outer surface of the tubing followed by an infrared imager at a fixed distance behind the line source. Quantitative images of the material loss due to corrosion are reconstructed from measurements of the induced surface temperature variations. This paper will present a discussion of the development of the thermal imaging system as well as the techniques used to reconstruct images of flaws. The application of the thermal line source coupled with the analysis technique represents a significant improvement in the inspection speed and accuracy for large structures such as boiler waterwalls.

  10. 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

  11. Reflexiones sobre la codificación del derecho de aguas

    OpenAIRE

    Mathus Escorihuela, Miguel

    2014-01-01

    El trabajo aborda la cuestión de la sistematización del derecho de aguas através de códigos de agua en la República Argentina, es decir, considerando el esquema federal de competencias del país. Trata la gestión histórica del derecho provincial de aguas y de la codificación en particular. Define que debe entenderse por un código de aguas y cuáles son las temáticas que debe contener, a la vez que se ocupa de enunciar otros temas que algunos códigos incorporan, analizando la conveniencia de su ...

  12. La ley de aguas de Entre Rios : La necesidad de su estudio en dos dimensiones

    OpenAIRE

    Maiztegui Martínez, Horacio Francisco

    2014-01-01

    El tema asignado, es el análisis de la ley de aguas de Entre Ríos N° 9.172. Trataremos de responder a las siguientes preguntas ¿Que tipos de aguas regula la ley de aguas?; ¿como se organiza el Gobierno del Agua?; ¿Como es el sistema de permisos, concesiones?; ¿Que instrumentos de conocimiento y protección prevé la ley? La ley Entrerriana, presenta una falta de adecuación a la ley Nacional como la ley 25.688, a los principios de la sustentabilidad (art.41 ° de la C.N., Ley n ° 25675 general...

  13. Claves y oportunidades para un pacto del agua en España.

    OpenAIRE

    Garrido Colmenero, Alberto; Custodio, Emilio

    2012-01-01

    Las peculiaridades geográficas españolas y su errática gestión del agua en las últimas décadas la sitúa en el marco internacional como un país incapaz de armonizar su escasez de recursos hídricos con su alto consumo interior. Por otro lado, España es pionera en tecnología relacionada con el agua, situándose entre los diez países más relevantes a nivel mundial. Por esto, diversas organizaciones independientes como el Observatorio del Agua de la Fundación Botín abogan por un Pacto del Agua, que...

  14. La biofiltración, una alternativa para la potabilización del agua

    Directory of Open Access Journals (Sweden)

    Álvaro Arango Ruiz

    2004-01-01

    Full Text Available Actualmente, la población de los países en desarrollo experimenta la carencia de condiciones sanitarias adecuadas, incluyendo la de contar con agua potable que satisfaga sus condiciones básicas. La falta de potabilización del agua está asociada con enfermedades y muerte en población infantil por enfermedades de origen hídrico. La no disponibilidad de agua apta para el consumo humano plantea la necesidad de interesarse por proyectos innovadores en este campo, como es el caso de la biofiltración, presentando alternativas de tratamiento, potabilización y distribución eficiente del agua que sean accequibles y económicamente viables

  15. Acuaporinas: proteínas mediadoras del transporte de agua.

    OpenAIRE

    Julio César Sánchez

    2009-01-01

    Introducción. Todos los organismos vivos están compuestos en su mayoría por agua, siendo ésta fundamental para la homeostasis celular a todo nivel. Por esta razón su transporte a través de las membranas biológicas ha sido siempre un campo de gran interés en la fisiología. La investigación acerca de este tópico se ha incrementado notablemente en los últimos años a partir del descubrimiento de las acuaporinas, las cuales han permitido comprender mejor los mecanismos que la célula utiliza para e...

  16. Servicios ambientales, agua y economía

    Directory of Open Access Journals (Sweden)

    Juan Pablo Ruiz Soto

    2007-11-01

    Full Text Available Los servicios ambientales (SA asociados a los ecosistemas naturales están seriamente amenazados por acciones locales y por el calentamiento global. El SA asociado al agua y su efecto sobre calidad y cantidad en cuencas hidrográficas aportantes a acueductos y sistemas de riego, son de gran importancia económica y social. Para Bogotá-Colombia el SA de los páramos y bosque nublado en la cuenca de Chingaza representa US$18,2 millones anuales. Para el abastecimiento de agua a la ciudad de Quito-Ecuador, el efecto negativo del cambio climático (CC asociado a la contracción de los glaciares representa un incremento en la inversión de un 31% versus el escenario sin CC. Se deben tomar medidas para asegurar la permanencia de los SA y mitigar los efectos del CC./ Environmental services (ES related to natural ecosystems are seriously threatened by local activities and global warming. The ES related to water and its effect on quality and quantity in watersheds that supply aqueducts and irrigation systems has great social and economic importance. For Bogotá-Colombia the ES of páramos and cloudy forest in the Chingaza basin represents US$18.2 million per year. For water supply in the city of Quito-Ecuador, the negative effect of climate change (CC related to the contraction of glaciers represents a 31% increase in investments versus the scenario without CC. Measures must be taken to ensure the permanence of ES and mitigate the effects of CC.

  17. ¿Qué tan importante es el agua? Desarrollo sustentable y recursos naturales

    OpenAIRE

    Kras, Eva; Simonsen, Ove

    2001-01-01

    A partir de una definición de desarrollo sustentable, se presenta el modelo de desarrollo global como filosofía imperante en torno al agua, y las realidades globales del agua, particularmente en torno a la contaminación, la salud, y la sustentabilidad y seguridad. Se analizan las oportunidades y retos para los países en desarrollo de América Latina, y se proponen acciones puntuales.

  18. Productividad del agua en algunos cultivos agrícolas en Cuba

    Directory of Open Access Journals (Sweden)

    Felicita González Robaina

    2014-01-01

    Full Text Available Para el mejor uso económico y social del agua se requieren de métodos para evaluar su productividad, a fin de tomar mejores decisiones en cuanto a políticas y estrategias de utilización de manera sostenible. Los administradores del agua para el riego necesitan iden- tificar tendencias en los patrones de uso y niveles de eficiencia con vistas a fijar metas y mejorar la productividad por unidad de volumen utilizado y/o consumido. El objetivo de este trabajo fue presentar los indicadores de productividad agronómica del agua de 17 cultivos a partir de la información obtenida en más de 100 experimentos de campo disponibles en la base de datos sobre necesidades hídricas del Instituto de Investigaciones de Ingeniería Agrícola. Se determinaron los rendimientos máximo y mínimo y sus respectivos valores de consumo, agua aplicada por riego y la productividad agronómica del agua aplicada para los 17 cultivos estudiados. Cultivos como los frijoles, maíz, boniato y los plátanos obtienen incrementos de rendimiento superiores al 100% cuando se aplica el agua necesaria para satisfacer su demanda hídrica, mientras que la yuca obtuvo valores menores del 50%. Los altos valores obtenidos de productividad en base al agua utilizada como riego no son un buen indicador del uso eficiente del agua por las plantas para las condiciones de la zona de estudio, donde se informan para los años analizados, porcentajes de lluvia aprovechable de hasta el 41%, supliendo ésta una parte importante de las necesidades de los cultivos agrícolas.

  19. Diseño de una planta depuradora de aguas residuales urbanas

    OpenAIRE

    Rodríguez Ruiz, Lucía

    2005-01-01

    El presente proyecto tiene por objeto el diseño de una estación depuradora de aguas residuales urbanas situada próxima a un núcleo urbano y cuyo vertido se hará en una zona considerada como zona sensible según el Real Decreto-Ley 11/1995, de 28 de diciembre, por el que se establecen las normas aplicables al tratamiento de las aguas residuales urbanas.

  20. Agua que no has de beber… déjala correr

    OpenAIRE

    Agredo Cardona, Gustavo Adolfo

    2010-01-01

    En el panorama mundial existe preocupación por la utilización o consumo del agua, sus costos (Spiller, Savedoff, y Banco Interamericano de Desarrollo, 2000), disponibilidad, aprovechamiento o pérdida de ésta. La consideración ambiental no está relacionada con la desaparición de algunas especies o por la ausencia del agua, sino porque se pone en riesgo la vida humana.

  1. Solubilidad de acetaminofén en sistemas agua-alcohol usp-jarabe usp y agua-alcohol usp-sorbitol usp

    OpenAIRE

    Bolaños, Clara Inés; Erazo, Ernesto Alonso; Luengas, Pilar; Barbosa, Helber; Martínez, Fleming

    2009-01-01

    Se determinó la solubilidad de una muestra de acetaminofén del mercado nacional a 20.0 ± 0.5 ºC en sistemas solventes ternarios agua – alcohol USP – jarabe USP – y agua – alcohol USP – sorbitol USP, como aporte a la generación sistemática de información sobre las propiedades fisicoquímicas en estudios de preformulación de formas farmacéuticas líquidas homogéneas. Los resultados muestran que las mezclas agua – alcohol USP – jarabe USP de composición en peso 30 – 60 – 10 % y a...

  2. La hidrología y su papel en ingeniería del agua

    Directory of Open Access Journals (Sweden)

    Amanda García-Marín

    2014-07-01

    Full Text Available La Hidrología es una ciencia esencial en Ingeniería del Agua, la cual abarca un amplio abanico de temas de investigación que engloban los diversos estadios del agua en el ciclo Hidrológico, tanto en atmósfera, superficie y suelo. Con motivo del relanzamiento de la revista Ingeniería del Agua se presenta un breve artículo de carácter introductorio en el que se muestran algunas de la líneas de investigación actuales en Hidrología, dedicadas a lluvia, interceptación de agua por la vegetación, sensores en Hidrología, agua subterránea, entre otras. Dicha revisión no pretende ser exhaustiva, dado el tamaño limitado de este formato de publicación, sino motivar la publicación en Ingeniería del Agua de artículos dentro de la temática Hidrología.

  3. Distribución del agua en el Perú desde una perspectiva de cuenca

    Directory of Open Access Journals (Sweden)

    Ana Sabogal

    2009-12-01

    Full Text Available El artículo plantea la importancia de integrar el concepto de cuenca a la distribución de los recursos. Se propone integrar un trabajo detallado por cuenca que involucre el cálculo del caudal de agua, la variación de la napa freática, el caudal ecológico, los volúmenes de erosión y la distribución actual del agua, para de allí plantear la distribución del agua en la cuenca. El aprovechamiento y distribución de los recursos naturales se encuentran estrechamente vinculados a la distribución del agua. Una inadecuada distribución del agua orientada solo a satisfacer el aprovechamiento de los recursos, sin tener en cuenta los ciclos ecológicos para su reposición, puede destrozar los ecosistemas existentes.El conjunto de cuencas, como unidades geográficas, deben contribuir a una gestión de recursos que permita una adecuada distribución del agua y potencie cada región, integrándola a un sistema de distribución de oportunidades, riqueza y producción en el contexto del país.

  4. El precio del agua: ¿herramienta básica para una política sostenible del agua?

    OpenAIRE

    Massarutto, Antonio

    2003-01-01

    La reciente legislación europea adopta el concepto de la recuperación completa de costes (RCC) como directriz para la tarifación del servicio de agua. En este artículo, se analiza el concepto de RCC al tiempo que se aborda la razón económica de su aplicación desde diferentes perspectivas. La idea básica aquí desarrollada es que se trata de un concepto un tanto confuso, ya que los costes se recuperan por definición, estando por tanto el verdadero problema en evaluar cómose recuperan. Después d...

  5. Investigación técnica y económica sobre desinfección de aguas residuales por sistemas de oxidación

    OpenAIRE

    Gordillo de Coss, Gerardo Enrique

    2013-01-01

    Un incremento de la demanda del agua, junto con el aumento de la contaminación, ha provocado que hoy en día la reutilización de las aguas depuradas sea necesaria, pero la reutilización de aguas debe garantizar y minimizar los posibles riesgos sanitarios y medioambientales que su práctica pueda provocar. En España estos parámetros se encuentran regulados por el RD 1620/2007 relativo al régimen jurídico de la reutilización de las aguas depuradas. Las aguas regeneradas son aguas que ya han sido ...

  6. Estudio del mecanismo de falla de terraplenes debido a la infiltración de aguas lluvias mediante el monitoreo de presiones de poros y contenidos de agua

    OpenAIRE

    García, Edwin; Uchimura, Taro

    2008-01-01

    El presente artículo muestra experimentos realizados utilizando modelos a escala para estudiar el proceso de infiltración en terraplenes sometidos a aguas lluvias. Varios modelos a escala fueron construidos usando un suelo arenoso con alto contenido de finos; para aplicar la lluvia artificial y observar el proceso de infiltración del agua se utilizó un tubo de irrigación. Para monitorear los cambios en succión ocasionados por los ciclos de humedecimiento y secado se instalaron dentro del suel...

  7. Estudio del mecanismo de falla de terraplenes debido a la infiltración de aguas lluvias mediante el monitoreo de presiones de poros y contenidos de agua

    OpenAIRE

    EDWIN GARCÍA; TARO UCHIMURA

    2007-01-01

    El presente artículo muestra experimentos realizados utilizando modelos a escala para estudiar el proceso de infiltración en terraplenes sometidos a aguas lluvias. Varios modelos a escala fueron construidos usando un suelo arenoso con alto contenido de finos; para aplicar la lluvia artificial y observar el proceso de infiltración del agua se utilizó un tubo de irrigación. Para monitorear los cambios en succión ocasionados por los ciclos de humedecimiento y secado se instalaron den...

  8. Estudio geoquímico de suelos y aguas como base para evaluar la contaminación: relación roca-suelo-agua

    OpenAIRE

    Vázquez Garranzo, Icíar

    2008-01-01

    Los objetivos generales del estudio de los suelos han sido, por un lado, establecer los valores de referencia de elementos traza a partir de la determinación de los valores de fondo y, por otro, demostrar las diferencias de disponibilidad entre el contenido de un elemento aportado al suelo y el contenido litogénico del mismo en suelo. Para el estudio de las aguas, los objetivos han sido: establecer la calidad química del agua en base a su comparación con indicadores de acuerdo con los req...

  9. Pobreza, agua y tierra en Ambato, Ecuador: Perfil de pobreza y el acceso y manejo de agua y tierra en la cuenca de Ambato, Ecuador

    OpenAIRE

    Chapalbay, Washington; Cordero, Doris; Gómez, Ligia Ivette; Munk Ravnborg, Helle

    2007-01-01

    Este informe tiene coma objetivo presentar el perfil de pobreza para la cuenca del rio Ambato, la prov1ncia de Tungurahua, Ecuador, )' analizar en que medida el acceso al agua, particularmente para el riego, ya la tierra, depende de los niveles de pobreza. El manejo del agua es clave en la cuenca de Ambato, principalmente para la producci6n agricola. Con base en el perEl de pobreza, casi dos terceras partes de las familias tienen acceso al riego. De la misma forma, casi la totalidad de las fa...

  10. La posible creación de mercados de agua y la gobernabilidad de este recurso en Colombia. Comentarios sobre el proyecto de ley del agua

    OpenAIRE

    Manuel Rodríguez Becerra

    2005-01-01

    En la actualidad se está tramitando un proyecto de Ley del Agua en el Congreso de la República, presentado a su consideración por el Gobierno Nacional, mediante el cual "se establecen medidas para orientar la planificación y administración del recurso hídrico en el territorio nacional." Se trata de la segunda reforma del gobierno del Presidente Alvaro Uribe relacionada con la gestión del agua en Colombia. En efecto, al principio de su gobierno se expidió la Ley de 2003 de creación del Ministe...

  11. EFECTOS DE LA PRIVACIÓN DE AGUA EN UN PROGRAMA DE REFORZAMIENTO IV 5' SOBRE EL PESO CORPORAL, EL CONSUMO DE AGUA Y ALIMENTO EN RATAS

    OpenAIRE

    Antonio López-Espinoza; Américo Ríos; Ma. Eugenia Soto

    2004-01-01

    Cuatro ratas fueron expuestas a un programa de privación de agua con 1 hora de acceso libre y 23 horas de privación en un programa de reforzamiento N 5; otras cuatro ratas fueron usadas como sujetos control. Laduración de los periodos de restricción fuede 30, 64, 25 Y 28 días con intervalos de libre acceso entre cadaunode ellos. El alimento se mantuvo en libreacceso durante todoel experimento. Los resultaron confirmaron que al retirar la privación de agua se modificó el patrón de alimentación...

  12. 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

  13. The decommissioning of the water boiler reactor

    International Nuclear Information System (INIS)

    Following completion of service, the Water Boiler Reactor (WBR) has been decommissioned by the Institute of Nuclear Energy Research (INER) under the Atomic Energy Council's (AEC) regulation. The WBR is a light water moderated and graphite reflected research reactor with peak thermal power of 100 kW. The unique feature of the WBR is that it is fueled with uranyl sulfate (UO2SO4) which is in liquid form. Since there is another research reactor owned by I7NER of megawatt scale in the planning stages for decommissioning, the WBR project was conducted with great care to accumulate experience. Extensive planning by INER and step-by-step regulative activities by AEC were followed regardless of the structural simplicity of the WBR. Valuable information was gathered in the task and will be useful for preparing future decommissioning needs. The major work in the WBR decommissioning project was finished within six months and the accumulated dose received during the work was 1 9.63mSv. (author)

  14. Predictive modelling of boiler fouling. Final report.

    Energy Technology Data Exchange (ETDEWEB)

    Chatwani, A

    1990-12-31

    A spectral element method embodying Large Eddy Simulation based on Re- Normalization Group theory for simulating Sub Grid Scale viscosity was chosen for this work. This method is embodied in a computer code called NEKTON. NEKTON solves the unsteady, 2D or 3D,incompressible Navier Stokes equations by a spectral element method. The code was later extended to include the variable density and multiple reactive species effects at low Mach numbers, and to compute transport of large particles governed by inertia. Transport of small particles is computed by treating them as trace species. Code computations were performed for a number of test conditions typical of flow past a deep tube bank in a boiler. Results indicate qualitatively correct behavior. Predictions of deposition rates and deposit shape evolution also show correct qualitative behavior. These simulations are the first attempts to compute flow field results at realistic flow Reynolds numbers of the order of 10{sup 4}. Code validation was not done; comparison with experiment also could not be made as many phenomenological model parameters, e.g., sticking or erosion probabilities and their dependence on experimental conditions were not known. The predictions however demonstrate the capability to predict fouling from first principles. Further work is needed: use of large or massively parallel machine; code validation; parametric studies, etc.

  15. 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.

  16. Performance of a pellet boiler fired with agricultural fuels

    International Nuclear Information System (INIS)

    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. Provence 250 MWe unit: the largest CFB boiler in operation

    Energy Technology Data Exchange (ETDEWEB)

    Delot, P.; Roulet, V.; Lucat, P.; Levy, D. [Electricite de France, La Defense (France)

    1997-12-31

    Among the new Clean Coal Technologies, `Circulating Fluidized Bed, is one of the most promising. The interest of this technology has been confirmed by the success of the first large French CFB boiler (E. Huchet 125 MWe), which has already logged more than 30 000 hours of satisfactory operation. Today, the first 250 MWe CFB unit in the world is in operation at Provence Power Station in the south of France. At such a size, the CFB technique has now reached a capacity corresponding to thermal power plants operated by utilities. This new unit, with a `pant leg` design, is also a very important step towards larger sizes, i.e. 400 MWe and bigger. The purpose of the Provence project was to replace the existing pulverised coal boiler unit 4, commissioned in 1967, of the Provence/Gardanne power plant, with a new CFB boiler while reusing most of the existing equipment. The new boiler was ordered from GEC ALSTHOM Stein Industrie by Electricite de France (EDF) on behalf of the SOPROLIF consortium. The 250 MWe Boiler is of the high pressure-reheat type firing local high-sulfur sub-bituminous coal with the possibility of cofiring high viscosity residual oil (with a high sulfur content) up to a 50%-50% energy ratio. This paper describes, besides the construction progress of the plant and technical details of the new boiler and auxiliaries, the main observations made during commissioning. Also presented are some results of a 100% load test and the investigation program defined to give a thorough evaluation of this boiler with a view to the design of large CFB in the future.

  19. 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)

    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 134I was shown only by Boiler - 5. No other boilers showed any activity of 134I. 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)

  20. Dispositivo electrónico de medición del caudal de agua para canales abiertos

    OpenAIRE

    Julio Cesar Ayala López; Roberto Albóniga Gil

    2015-01-01

    El método de riego por inundación, que desplaza el agua mediante canales abiertos y surcos ha sido usado durante años en la producción agrícola, aunque requiere una gran cantidad de agua y su eficacia no es muy alta ya que la mayoría del agua no se puede extraer directamente en las raíces de las plantas. Siendo de vital importancia lograr datos de campo confiables y lo suficientemente precisos que nos permitan estudiar y proyectar manejos del agua con el menor grado de incertidumbre posi...

  1. Normalización de la terminología mexicana sobre el agua Standardization of Mexican terminology on water

    OpenAIRE

    Catalina Naumis-Peña; Verónica Vargas-Suárez

    2009-01-01

    Se expone el resultado de una investigación llevada acabo para conocer el estado de la normalización terminológica en tesauros especializados que incluyen el agua dentro de sus áreas contratando los términos usados en la literatura mexicana. La documentación que se genera sobre el tema del agua en México crece en forma exponencial en tanto que la problemática del agua exige soluciones integrales. Actualmente no existe un tesauro, ni terminologías relacionadas con el tema del agua en México, n...

  2. La lucha por el agua en el país de la lluvia (Galicia, siglos XVI-XIX)

    OpenAIRE

    Ofelia REY CASTELAO

    2013-01-01

    En este artículo se estudia la intensa conflictividad por el agua que se vivió en la Galicia de la Edad Moderna debido al déficit de aguas de riego durante el verano, y a los complejos sistemas de usufructo del agua para uso doméstico y agrícola. Para conocer las causas de los conflictos, su cronología, su distribución territorial y los grupos sociales que los protagonizaron, se utilizan escrituras notariales –sobre todo, poderes y concordias–, y los pleitos por aguas atendidos por la Real Au...

  3. Casos de estudio: ahorro de agua en los regadíos de Aragón

    OpenAIRE

    Playán Jubillar, Enrique; Faci González, José María; Cavero Campo, José; Dechmi, Farida; Lecina Brau, Sergio

    2000-01-01

    En esta ponencia se comienza discutiendo las posibilidades de ahorro de agua en la agricultura. Se concluye que sólo es posible ahorrar agua si se disminuye la intensidad de los cultivos o su extensión. Por ello, se opta por la "conservación" de agua, un concepto que implica el ahorro de agua regulada. Se comentan cinco casos de estudio de zonas regables en Aragón. En Almudévar (un regadío tradicional), la eficiencia de riego está en torno al 50%, y las posibilidades de conserv...

  4. Calidad de las aguas meteóricas en la ciudad de Itajubá, Minas Gerais, Brasil

    OpenAIRE

    Herlane Costa Calheiros; Mônica Regina Gomes; Percy Máximo Anco Estrella

    2014-01-01

    El objetivo de este estudio fue evaluar la calidad del agua meteórica en la ciudad de Itajubá, ubicado en la parte sur de Minas Gerais, Brasil. Para ello, se realizaron la colecta y análisis de la calidad de las muestras de agua de lluvia después de escurrir sobre la superficie de tres tipos de materiales; amianto, zinc y cerámica. También se realizó una colecta directa para comparar los resultados y verificar los cambios en la calidad del agua. Se observó que la calidad del agua de lluvia va...

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

    Energy Technology Data Exchange (ETDEWEB)

    Qu, Ming [Purdue University, West Lafayette, IN; Abdelaziz, Omar [ORNL; Yin, Hongxi [Southeast University, Nanjing, China

    2014-11-01

    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 gas boilers for applications with process fluid return temperatures higher than or close to the dew point of the water vapor in the flue gas.

  6. Development of the boiler tube wall thickness ultrasonic detector

    International Nuclear Information System (INIS)

    Wall thickness of fossil fuel firing power boiler tubes are measured by ultrasonic test at regular intervals as part of in-service inspections. The measuring tubes are located high up on the boiler and at restricted sites, and many man-hours are required for preparatory of boiler tube wall thickness scale removal. To improve the efficiency and reliability of boiler tube wall thickness measurements, a system was developed for measuring the tube wall thickness by ultrasonic test from inside the tube. The primary features of this system are: 1) polishing on the outersurface of boiler tubes is not necessary because measurements are made from inside. (Reduction of man-hours), 2) measurements in limited places where manual measurement is difficult or impossible is made possible because automatic measurement from inside the tube is made by an ultrasonic probe introduced into the tube from the inspection hole of the header. (Improvement of reliability), and 3) the tube wall thickness is measured by a submerged ultrasonic rotary probe at an accuracy of ±0.1 mm along the full length. (Improvement of reliability)

  7. 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)

  8. PERANCANGAN pH METER PADA BOILER HRSG BERBASIS ARDUINO

    Directory of Open Access Journals (Sweden)

    Yuliza .

    2015-02-01

    Full Text Available Air merupakan zat yang sangat dibutuhkan pada setiap sektor industri, termasuk pemanfaatan untuk kebutuhan energi dan pemanasan. Kebutuhan energi dan pemanasan di industri umumnya dipenuhi dengan cara memanfaatkan steam yang dibangkitkan dalam suatu ketel (boiler. Air yang digunakan sebagai umpan boiler dapat diperoleh dari berbagai sumber yaitu danau, sungai, laut, maupun sumur. Kandungan  air ini sangat mempengaruhi Harga pH pada air umpan boiler, penting untuk diperhatikan untuk mencegah terjadinya korosi. Terdapat hubungan antara pH dan laju terjadinya korosi pada bahan konstruksi dari logam mild steel yang menunjukan adanya kecenderungan menurunnya korosi dengan naiknya harga pH. Namun pada bahan konstruksi dari logan Cu terjadi sebaliknya, yaitu kecenderungan laju korosi naik dengan menaiknya harga pH diatas pH 9. Dengan perancangan alat berbasis mikrokontroller arduino yang telah dilakukan dan berfungsi dengan baik, diharapkan  pH yang terdapat pada water boiler dapat dikontrol nilai pembacaannya dengan baik untuk mencegah korosif pada pipa boiler.

  9. 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.

  10. Assessment of wood pellet combustion in a domestic boiler

    International Nuclear Information System (INIS)

    Wood pellet is a densified and homogeneous fuel to have better transport, storage and feeding capabilities than the original biomass for various domestic and industrial uses. A wood pellet boiler or stove needs to achieve complete combustion and high energy efficiency, which is often not easy for domestic application due to the design requirement for compact furnace and heat exchangers. This paper presents the design assessment of a 35 kW wood pellet boiler for domestic heating using experiments and computational fluid dynamic (CFD) simulations. For wood pellets with a lower heating value of 18 MJ/ kg and diameter 8 mm, the gas composition, temperatures and ash characteristics were measured from different parts of the boiler for various operational load, air flow rate and furnace configurations. The effects of other key parameters on the performance of the boiler were analyzed by CFD, which include furnace shapes, flow distribution and directions of secondary/ tertiary air. The results show that introducing simple measures to enhance gaseous mixing and reactions can greatly improve the combustion efficiency in a compact furnace. The findings can be applied to wood pellet boilers with difference capacities. (author)

  11. Two proposals to determine the efficiency of bagasse boiler

    Energy Technology Data Exchange (ETDEWEB)

    Sosa-Arnao, Juan Harold; Modesto, Marcelo [Universidade Estadual de Campinas (DE/FEM/UNICAMP), SP (Brazil). Fac. de Engenharia Mecanica. Dept. de Energia], e-mail: jhsosa@fem.unicamp.br; Nebra, Silvia A. [State University of Campinas (NIPE/UNICAMP), SP (Brazil). Interdisciplinary Center of Energy Planning], e-mail: silvia.nebra@pesquisador.cnpq

    2006-07-01

    This work analyzes and compares two proposals for determination of the bagasse boiler efficiency, one of it based on bagasse higher heating value (HHV), the other one based on bagasse lower heating value (LHV). The methodology of calculation, for both proposals, uses the heat loss method. The results, obtained through the two proposal's, presented important differences; the boiler efficiency determined through the proposal of code ASME PTC 4.1, based on HHV, highlights the effect of bagasse moisture content upon boiler efficiency. This effect, in the Beaton and Lora proposal, is hidden, because the energy required to evaporate the bagasse moisture content and the water vapour from hydrogen contained in the fuel are discounted in the LHV calculation. Three types of boilers, with different capacity and leaving steam properties were analysed. Considering the boiler constituted by a sequential arrangement of a steam generator, an air heater and an economizer, a simulation was made determining the influence of the variation of the air heater exit gases temperature upon theirs performances. The performance analysis was based on the second law of thermodynamics. (author)

  12. Investigations of operation problems at a 200 MWe PF boiler

    Directory of Open Access Journals (Sweden)

    Peta Sandile

    2015-09-01

    Full Text Available To minimize oxides of nitrogen (NOx emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of global boiler air/flue gas distribution, wind-box air distribution and measures for making uniform the flow being delivered to burners within a wind-box system. This is achieved by Process Flow Modelling, at-the-burner static pressure measurements and CFD characterization. Global boiler mass and energy balances combined with validated site measurements are used in an integrated approach to calculate the total (stoichiometric + excess air mass flow rate required to burn the coal quality being fired, determine the actual quantity of air that flows through the burners and the furnace ingress air. CFD analysis and use of at-the-burner static, total pressure and temperature measurements are utilized in a 2-pronged approach to determine root-causes for burner fires and to evaluate secondary air distribution between burners.

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

    International Nuclear Information System (INIS)

    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 CO2 by 2019. ► This generated lowest unit cost of carbon reduction in the world: about $2.5 per ton of CO2 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 CO2 mitigation.

  14. Studies Concerning Water-Surface Deposits in Recovery Boilers

    International Nuclear Information System (INIS)

    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

  15. Numerical simulation of a small-scale biomass boiler

    International Nuclear Information System (INIS)

    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.

  16. 46 CFR 52.01-35 - Auxiliary, donkey, fired thermal fluid heater, and heating boilers.

    Science.gov (United States)

    2010-10-01

    ... requirements for miscellaneous boiler types, such as donkey, fired thermal fluid heater, heating boiler, etc., may be found, refer to Table 54.01-5(a) of this subchapter. (b) Fired vessels in which steam...

  17. Ahorro de agua y materia prima en los procesos de pelambre y curtido del cuero mediante precipitación y recirculación de aguas

    Directory of Open Access Journals (Sweden)

    SANDRA AGUDELO A.

    2007-01-01

    Full Text Available El principio del proceso de recuperación de cromo, consiste en precipitar el cromo contenido en el licor residual como hidróxido utilizando un álcali; este precipitado se separa por sedimentación y se disuelve nuevamente con ácido sulfúrico. De los resultados obtenidos, se observaron porcentajes de remoción superiores al 99%. Con la recirculación directa de aguas de pelambre fue posible obtener ahorros de agua del 64% y ahorros en materia prima del 32 %, además, con una adecuada selección del tamizador es posible recircular el agua un número máximo de tres veces, sin afectar la calidad del producto final. Así mismo, se comprobó la viabilidad de la recirculación directa de aguas de curtido, con ahorros de materia prima del 17%. Con medidas de este tipo, prácticas y fáciles de implementar, la industria del curtido del cuero podría disminuir considerablemente la contaminación, operar de una forma mas segura y con mayor eficiencia de producción.

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

    International Nuclear Information System (INIS)

    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

  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. PERFORMANCE EVALUATION OF BOILERS (80 AND 40 TPH) AND 21MW STEAM TURBINE OF COGEN PLANT

    OpenAIRE

    D.P.TAWARE; P.E.CHAUDHARI; U.M.SHIRSAT

    2014-01-01

    The proposed study is conducted at The Malegaon Sugar Mills, Baramati, and District Pune. Data is collected for a high pressure 80 TPH & 40TPH bagasse fired boiler. The boilers are natural circulation and bi-drum water tube type. The both boilers are equipped with super heater, air heater and economizer in order to utilize maximum available heat of flue gases. Boiler efficiency is calculated by indirect method. Also plant has 21 MW cogeneration capacity, with two turbines are installed with c...

  1. Artificial Intelligent System for Steam Boiler Diagnosis based on Superheater Monitoring

    OpenAIRE

    Hussain H. Al-Kayiem; Firas B. Ismail Alnaimi

    2011-01-01

    Steam Boilers are important equipment in power plants and the boilers trip may lead to the entire plant shutdown. To maintain performance in normal and safe operation conditions, detecting of the possible boiler trips in critical time is crucial. Artificial Neural network applications for steam boilers trips are developed designed and parameterized. In this present study, the developed systems are a fault detection and diagnosis neural network model. Some priori knowledge of the demands in ne...

  2. Analysis of Boiler Operational Variables Prior to Tube Leakage Fault by Artificial Intelligent System

    OpenAIRE

    Al-Kayiem Hussain H.; Al-Naimi Firas B. I.; Amat Wan N. Bt Wan

    2014-01-01

    Steam boilers are considered as a core of any steam power plant. Boilers are subjected to various types of trips leading to shut down of the entire plant. The tube leakage is the worse among the common boiler faults, where the shutdown period lasts for around four to five days. This paper describes the rules of the Artificial Intelligent Systems to diagnosis the boiler variables prior to tube leakage occurrence. An Intelligent system based on Artificial Neural Network was designed and coded i...

  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. Numerical simulation based cold tests for a tangentially fired boiler

    Institute of Scientific and Technical Information of China (English)

    XIANG Yuhua; ZHANG Jiayuan; ZHANG Xiaohui

    2012-01-01

    Such problems as flameout and serious slagging frequently occurred in a 170 t/h tangentially fired boiler burning inferior coals and with low load.Thus,cold tests were carried out to comprehensively investigate the performance of each air tube and the size and position of the tangential circle.Therefore,the cause and area of slagging in furnace can be determined.Thus,by numerical simulation on combustion,the optimal operation parameters for the boiler burning different coals under various loads conditions can be provided.The actual application showed that,the boiler fed with present coal can be long-term operated stably at 60% load,and its heat efficiency was up to 91%.Moreover,the abnormal flameout no longer occurred,and the slagging was alleviated a lot.

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

    DEFF Research Database (Denmark)

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

    2003-01-01

    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...... instrumentation to verify heat transfer, circulation in the evaporator circuit and water level fluctuations in the drum....

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

    DEFF Research Database (Denmark)

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

    2003-01-01

    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 ue 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 ue gas side to the water-/steam side in order to simulate the circulation in the evaporator circuit and hereby the water level uctuations in the drum. The dynamic model has...... heat transfer, circulation in the evaporator circuit and water level uctuations in the drum....

  7. NOx CONTROL OPTIONS AND INTEGRATION FOR US COAL FIRED BOILERS

    Energy Technology Data Exchange (ETDEWEB)

    Mike Bockelie; Marc Cremer; Kevin Davis; Bob Hurt; Eric Eddings

    2001-01-31

    This is the second Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for firing US coals. The focus of our efforts during the last three months have been on: (1) Completion of a long term field test for Rich Reagent Injection (RRI) at the Conectiv BL England Station Unit No.1, a 130 MW Cyclone fired boiler; (2) Extending our Computational Fluid Dynamics (CFD) based NOx model to accommodate the chemistry for RRI in PC fired boilers; (3) Design improvements and calibration tests of the corrosion probe; and (4) Investigations on ammonia adsorption mechanisms and removal processes for Fly Ash.

  8. 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.

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

    International Nuclear Information System (INIS)

    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

  10. Evaluación económica de la reutilización de agua para la creación de humedales artificales

    OpenAIRE

    Varela Bernaus, Héctor

    2007-01-01

    Orígenes y tratamiento de las aguas residuales. Funcionamiento de las estaciones depuradoras de aguas residuales (EDAR'S) y de los sistemas de humedales construidos (SHC'S). Evaluación económica de los (PMV) SHC --> Ejemplo: Can Cabanyes. Precio mínimo de venta del agua regenerada en los SHC y beneficios generados por los SHC. Ingresos generados por los SHC y factores limitantes del PMV y del agua regenerada.

  11. Analisis del efecto de los mercados de agua sobre el beneficio de las explotaciones, la contaminacion por nitratos y el empleo eventual agrario

    OpenAIRE

    Calatrava-Leyva, Javier; Colmenero, Alberto Garrido

    2001-01-01

    RESUMEN: La evidencia disponible sobre los efectos externos de los mercados de agua actualmente en funcionamiento es contradictoria. Algunos trabajos demuestran que el intercambio de agua reduce la contaminación derivada de los sistemas productivos del regadío, mientras que otros concluyen lo contrario. El uso combinado de tasas sobre el input contaminante y la implantación de un mercado de agua plantea incentivos a los productores con resultados ambiguos, entre otras razones porque agua y fe...

  12. Characterization of agua de Ramon marbles, Cordoba Province, Argentina

    International Nuclear Information System (INIS)

    Agua de Ramon district is located in the NW of Cordoba, Argentina, between 3 49' and 30052' S and 65021' and 65024' W, in the Eastern Pampean Range setting. It was a very important tungsten district until the end of 1950'decade when tungsten mining became of no economic interest. The objective is to report for the first time the petrological, mineralogical and geochemical characteristics of several marble lenses located in the sourthern of the area. Marble outcrops are lenticular ranging from 1 m to 80 m in length and 0.50 m to 20 m width. They appear massive, fine-grained and in light colors (white, pale green, very light brown and pale gray). These last varieties show a distinct banded structure due to little differences in color. These marbles are mainly composed of magnesian calcite accompanied by minor amounts of dolomite, forsterite, humite group minerals, tremolite, talc, serpentine and clinochlore, and scheelite, sphene, apatite and opaque minerals like hematite, magnetite, illmenite, pirrothite and pyrite as accessory minerals. Major chemical analyses indicate a relatively high SiO2 and MgO content, and minor CaO, in comparison with marbles of this type. Mineral paragenesis was useful to evaluate metamorphism conditions in this area

  13. 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...

  14. 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...

  15. 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...

  16. 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...

  17. 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.

  18. PENCEGAHAN KOROSI DENGAN BOILER WATER TREATMENT (BWT PADA KETEL UAP KAPAL.

    Directory of Open Access Journals (Sweden)

    Suleman Suleman

    2012-03-01

    Full Text Available 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.

  19. 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 78.33-1 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PASSENGER VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment § 78.33-1 Repairs of boiler and pressure vessels. (a) Before making any repairs to boilers...

  20. Device for cleaning regenerative air heaters of a boiler unit

    Energy Technology Data Exchange (ETDEWEB)

    Guzenko, S.I.; Buyevich, V.V.

    1982-01-01

    The device contains injection supersonic nozzles to which live steam of high pressure from the boiler SH is supplied through the reducer. An additional steam heater is connected to the plan arranged in the convective gas line of the boiler. In this case the heat exchanger of steam is heated to temperature excluding its condensation and precipitation of dew of sulfuric acid during injection of the RAH. The use of the proposed device improves the quality of cleaning and makes it possible to abandon stopping of the RAH for stopover water flushing.

  1. 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.

  2. Specific Emissions of Harmful Substances from Small Boilers

    OpenAIRE

    Horák Jiøí; Ochodek Tadeá

    1998-01-01

    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 Republi...

  3. CFD Studies on Multi Lead Rifled [MLR] Boiler Tubes

    Directory of Open Access Journals (Sweden)

    Dr T C Mohankumar

    2013-09-01

    Full Text Available This paper reports the merits of multi lead rifled [MLR] tubes in vertical water tube boiler using CFD tool. Heat transfer enhancement of MLR tubes was mainly taken in to consideration. Performance of multi lead rifled tube was studied by varying its influencing geometrical parameter like number of rifling, height of rifling, length of pitch of rifling for a particular length. The heat transfer analysis was done at operating conditions of an actual coal fired water tube boiler situated at Apollo Tyres LTD, Chalakudy, India for saturated process steam production. The results showed that the heat transfer increased when compared with existing inner plane wall water tubes.

  4. Designing a Bubbling Fluidized Bed (BFB) Boiler for Research Purposes

    OpenAIRE

    Castiella Franco, Daniel

    2013-01-01

    This project is part of the efforts made by Savonia University of Applied Sciences to design the future EU-funded combustion research laboratory that will be located on Varkaus Campus. The main objective of the present thesis was to carry out an optimal design, in technical, environmental and economical terms, of a small-sized bubbling fluidized bed (BFB) boiler, which will be used mainly for research purposes. This design takes as a reference a former BFB boiler that was located at L...

  5. Optimization of Bed Material Consumption in a CFBC Boiler

    OpenAIRE

    Ashish M. Pullekunnel; Manish R. Moroliya

    2015-01-01

    The proposed Case-Study is to identify the scope of energy conservation and cost saving through optimization of bed material in a CFBC Boiler during plant start up. The study was undertaken at Abhijeet MADC Nagpur Energy Pvt. Ltd (AMNEPL), a 4X61.5 MW power plant at MIHAN, Khairy Khurd, Hingna, Nagpur. The scope of the study covers the savings achieved during light up of 4X250 TPH boiler and the effect of the application of the proposed method on the energy conservatio...

  6. Hot Corrosion Studies in Coal Fired Boiler Environment

    OpenAIRE

    Kamal Subhash; Kumar Chennupati Vijya; Abdul-Rani A.M.

    2014-01-01

    Hot corrosion behaviour of the bare and D-gun coated superfer 800H exposed to low temperature super-heater zone of the coal fired boiler of Guru Nanak Dev Thermal Power Plant, Bathinda, Punjab, India. The specimens were hanged in the platen super-heater of coal fired boiler where the gas temperature was around 900 °C ±10 °C. Hot corrosion experiments were performed for 10 cycles, each cycle consisting of 100 hours exposure followed by 1 hour cooling at ambient temperature. Weight change measu...

  7. Exergy Analysis of Boiler In cogeneration Thermal Power Plant

    Directory of Open Access Journals (Sweden)

    Sarang j gulhane

    2013-10-01

    Full Text Available – Effective energy utilization and its management for minimizing irreversibility has made human to look for efficient energy consumption & conversion. Based on several research activity and local power plant experience some key observation has made and is presented in this paper The aim of this paper is to be find out amount and source of irreversibilities gererated in boiler of 35 TPH boiler in 6 MW captive power plant so that any process in the system that having largest energy destruction can be identified that help designer to re design the system components

  8. Comparison between the American and German code for power boilers

    International Nuclear Information System (INIS)

    Both are homogeneous and integral systems which describe the requirements for design, manufacturing and recurrent inspections of steam boilers. Both are internationally recognised but are of course, geared to different industrial developments and policies of their countries of origin. In the case of design requirements for boiler drums TRD demands 40% less minimum wall thickness than the ASME code. With this difference in wall thickness the same level of safety, however can only be achieved if all the differences of the two regulations are considered and applied down to the very last detail. (orig.)

  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. [Water birds from Agua Dulce lake and El Ermitaño estuary, Jalisco, Mexico].

    Science.gov (United States)

    Hernández Vázquez, Salvador

    2005-01-01

    Waterbird abundance, and seasonal and spatial distribution, were studied in two natural water pools at Jalisco, Mexico, from December 1997 through November 1998. Maximum monthly abundance in Agua Dulce lake and El Ermitaño estuary was 86 471 birds (29 686 in Agua Dulce and 56 785 in Ermitaño), with a total cummulative abundance of 179 808 individuals (66 976 in Agua Dulce and 112 832 in Ermitaño). A total of 87 waterbirds species were recorded, 78 in Agua Dulce and 73 in Ermitaño. The higher species richness and abundance was observed during winter, when migratory species arrived. Most species prefered shallow waters, except seabirds which prefered protected areas such as dunes in Agua Dulce. Other groups, like clucks and related species. prefered low salinity areas, for example in the south-east area of Ermitaño. The higher abundance of the shorehirds was found when the water level on the estuary was low. Herons were seen often at areas with high salinity and influenced by tides (e.g. mouth of Ermitaño). PMID:17354436

  11. Concepto y trascendencia del derecho de aprovechamiento en materia de aguas (Propiedad y Aprovechamiento

    Directory of Open Access Journals (Sweden)

    Enrique Guerra Daneri

    2013-12-01

    Full Text Available La disciplina de las aguas se encuentra estructurada jurídicamente, sólo en base a dos derechos: el de propiedad y el de aprovechamiento. La caracterización que posee el agua como cosa, impide que puedan ejercerse otros derechos sobre ella.El punto de partida para explicar este fenómeno, radica en que el agua responde a dos hechos técnicos que ofician como fuente material o factor de calificación jurídica: el principio de territorialidad y la unidad del ciclo hidrológico. Estos dan motivo a su comportamiento universal y en ellos se asienta su disciplina, más allá de la regulación particular que cada derecho positivo quiera desarrollar, imponiendo una política en la materia.  En síntesis, el agua es un bien cuyas particularidades determinan que en definitiva, el derecho de propiedad sea desplazado en su trascendencia patrimonial por otro derecho que ocupa su lugar en jerarquía e individualidad: el derecho de aprovechamiento. Sin embargo y a pesar de los sólidos fundamentos que lo sustentan, la identidad de este derecho parece todavía opacada por los reflejos de una propiedad, que en materia de aguas, es inoperante.       

  12. Nematodos en las plantas de tratamiento de agua para consumo humano en Costa Rica

    Directory of Open Access Journals (Sweden)

    Mariano Peinador

    2000-12-01

    Full Text Available Los nematodos acuáticos son habitantes frecuentes en las plantas de tratamiento de agua para consumo humano. Su presencia en ellas y el grado en que son removidos por dichas plantas puede ser utilizado como un parámetro de funcionamiento y de calidad de agua, ya que muchos organismos patógenos pueden pasar a los sistemas de distribución de agua dentro del cuerpo de los nematodos. Para analizar esta problemática se realizaron 1356 muestreos en el agua cruda y tratada de 27 plantas de tratamiento. Los resultados demuestran la alta incidencia de nematodos y la baja taza de remoción que presentan varias plantas de tratamiento, llegando a ser de 0. 5 en el 11% de las plantas, 0.4 en el 18% y 0.3 en el 29%. Este hecho se agrava si se toma en cuenta que dentro de las plantas de tratamiento que tienen una menor taza de remoción se encuentran las de mayor producción de agua para consumo.

  13. EVALUACIÓN DE LA PLANTA Lemna minor COMO BIORREMEDIADORA DE AGUAS CONTAMINADAS CON MERCURIO

    Directory of Open Access Journals (Sweden)

    Adolfo D. Arenas

    2011-01-01

    Full Text Available Se evaluó la capacidad biorremediadora de Lemna minor en función del tiempo en aguas contaminadas con mercurio mediante un diseño experimental de 3 bloques al azar con cinco réplicas: un grupo experimental con 100 g de Lemna, 7,5 L de agua contaminada con Hg (0,13 mgL-1 y solución nutritiva; un grupo Testigo con 100 g de Lemna, 7,5 L de agua y solución nutritiva y un grupo control con mercurio al nivel de 0,13 mgL-1 en agua destilada sin plantas. La eficiencia de remoción de mercurio de la Lemna minor, en 22 días, fue de 30%. Las variables peso fresco, peso seco, y nitrógeno y fósforo foliares no presentaron diferencias significativas entre los dos tratamientos. La absorción de potasio, fue afectada por los niveles de mercurio. La planta Lemna minor representa una alternativa para la remoción de mercurio en aguas contaminadas hasta un nivel de 0,13 mg/L.

  14. Calidad del agua y sedimento en el lago de Maracaibo, estado Zulia

    Directory of Open Access Journals (Sweden)

    Giovany José-Bracho

    2016-03-01

    Full Text Available Se analizó el agua y el sedimento del lago de Maracaibo en seis estaciones de muestreo distribuidas de norte a sur del lago. Los parámetros físicoquímicos y ambientales fueron determinados y establecidas las relaciones entre estos y las áreas afectadas por descargas de aguas residuales, depósitos de basura, residuos industriales líquidos y sólidos, actividad petrolera y agrícola y materiales orgánicos acarreados por ríos y drenajes pluviales. Se evidenció la contaminación por incremento de utrientes(nitrógeno y fósforo en las zonas influenciadas por los ríos y vertederos de agua residual y se validó la presencia de una cuña salina por la penetración al lago de las aguas del golfo de Venezuela. Las concentraciones de metalespesados están por debajo de los límites permisibles para el agua; en los sedimentos es muy heterogénea.

  15. Pueblos indígenas de Sonora: el agua, ¿es de todos?

    Directory of Open Access Journals (Sweden)

    Diana Luque

    2012-01-01

    Full Text Available La diversidad cultural y la problemática ambiental del agua en el estado de Sonora convergen en el presente trabajo, abordadas desde la perspectiva de la ecología política y la diversidad biocultural mediante un análisis transdisciplinario. Se distingue entre el acceso al agua para la subsistencia tradicional del agua para el desarrollo. Se advierten tendencias generalizadas de despojo de los territorios indígenas y sus recursos naturales, en las que los conflictos por el agua para la subsistencia son cada vez más graves, que exacerban la vulnerabilidad de las comunidades y la desorganización del complejo biocultural. El servicio del agua potable no tiene las condiciones para impulsar el desarrollo comunitario sustentable. Estas tendencias no son homogéneas, y se observan posibilidades de reconfiguración. Se requiere precisar el análisis para aportar al desarrollo de los pueblos indígenas, desde una plataforma biocultural contemporánea, en pleno respeto de sus derechos humanos individuales y colectivos.

  16. 76 FR 63614 - Agua Caliente Solar, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2011-10-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Agua Caliente Solar, LLC; Supplemental Notice That Initial Market-Based Rate...-referenced proceeding of Agua Caliente Solar, LLC's application for market-based rate authority, with...

  17. Plan de empresa y estudio de viabilidad de una consultora especializada en el ahorro y uso eficiente del agua

    OpenAIRE

    Rubio Berástegui, Javier

    2011-01-01

    Este proyecto fin de carrera consta de dos partes bien diferenciadas. En la primera parte se desarrolla el plan de empresa y el estudio de viabilidad de una consultora especializada en el ahorro y uso eficiente del agua, mientras que la segunda parte muestra el desarrollo técnico de un sistema de aprovechamiento de aguas grises para aseos.

  18. Portal Web "Portagua" para apoyar los conocimientos sobre la calidad del agua

    Directory of Open Access Journals (Sweden)

    José R. Ramírez Venega

    2012-01-01

    Full Text Available Se elaboró el portal Web "Portagua" cuyo contenido, sobre calidad del agua, resulta de vital importancia ya que en las últimas décadas la contaminación del agua, tanto superficial como subterránea, se ha incrementado notablemente. El portal incluye informaciones tales como: conferencias, regulaciones, artículos científicos, trabajos de diploma, figuras, videos y otras que han sido recopiladas y debidamente organizadas, a las que puede accederse con facilidad. Por el alcance de su contenido, permite quesea utilizado por todas las personas interesadas en el tema. Su uso contribuye a: optimizar el tiempo de búsqueda de los usuarios y apoyar los conocimientos sobre la calidad del agua.

  19. Riesgos a la salud por presencia del aluminio en el agua potable

    Directory of Open Access Journals (Sweden)

    Rodolfo Trejo Vázquez

    2004-01-01

    Full Text Available En la actualidad el aluminio tiene una amplia aplicación en la industria alimenticia, farmacéutica, del papel, de la construcción y en el tratamiento de agua para beber y agua residual. Sin embargo, no se ha dado énfasis a los posibles daños a la salud originados por el consumo de este elemento. Una de las enfermedades que ha sido asociada a la ingesta de este elemento es el Alzheimer y se corre el riesgo de desarrollar otros padecimientos. En el presente documento se resumen los resultados obtenidos de una investigación bibliográfica relacionada con los daños a la salud originados por el consumo de aluminio y compuestos fluoroaluminados, la finalidad es poner de manifiesto la importancia que tiene vigilar y controlar el contenido del aluminio en el agua potable

  20. El arte de aforar: del nilómetro a la paja de agua cordobesa

    OpenAIRE

    Roldán Cañas, José

    2014-01-01

    Esta ponencia pretende describir la evolución diacrónica del aforo desde los orígenes hasta la paja de agua cordobesa, o medida de agua que se usó en la ciudad de Córdoba entre los siglos XVI y XIX. También se presenta la determinación de su valor expresándolo en unidades del sistema métrico decimal. El aforo de corrientes de agua ha tenido un gran interés para la humanidad desde sus albores. Las grandes civilizaciones han nacido y crecido a la orilla de los grandes ríos, y ...

  1. Metagabro sill zircon dating: Archean age confirmation from the Aguas Claras formation, Carajas, Para State, Brazil

    International Nuclear Information System (INIS)

    The Carajas region, situated at Para State, Brazil, presents a great diversity of the mafic rock occurrences, distributed between various units. The rocks have been described petrographically and its geochemical and geochronological data have been accumulated. However, these last data are relatively limited or inexact due to the difficulties to these rock dating using the Uranium-Lead (U-Pb) in zircons method. The Aguas Claras Formation age is another problem in the Carajas stratigraphy. The occurrence of metagabros sills in the Aguas Claras region and the fact of existing zircons in these metagabros, stimulated the authors to realize a geochronological study of these metagabros aiming to define its age and, consequently, the minimum age of the Aguas Claras Formation. The paper presents the geological context and the methodology to develop the geochronological studies of these rocks. (author)

  2. Distribución del agua en el Perú desde una perspectiva de cuenca

    OpenAIRE

    Ana Sabogal

    2009-01-01

    El artículo plantea la importancia de integrar el concepto de cuenca a la distribución de los recursos. Se propone integrar un trabajo detallado por cuenca que involucre el cálculo del caudal de agua, la variación de la napa freática, el caudal ecológico, los volúmenes de erosión y la distribución actual del agua, para de allí plantear la distribución del agua en la cuenca. El aprovechamiento y distribución de los recursos naturales se encuentran estrechamente vinculados a la distribución del...

  3. Feasibility of Combustion of Petroleum Coke in 230t/h Circulating Fluidized Bed Boiler

    Institute of Scientific and Technical Information of China (English)

    HAN Dong-tai; SONG Zheng-chang; XU Tao

    2003-01-01

    In order to reuse the high sulfur petroleum coke, the waste in chemical industry, as fuel of power plant for energy recovery, the combustion property of petroleum coke was researched experimentally in circulating fluidized bed (CFB) boiler. The performance of the boiler in burning mixed fuel with different ratios of coal to petroleum coke is obtained. Based on the experimental data, Factors influencing the stability of combustion,thermal efficiency of boiler, and emissions and desulphurisation are discussed. This study demonstrates that the combustion of petroleum coke in CFB boiler is applicable, and has great significance on the design and operation of CFB boiler to burn petroleum coke.

  4. 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.

  5. Review of conditions for reliable boiler operation; Bedingungen fuer einen zuverlaessigen Kesselbetrieb

    Energy Technology Data Exchange (ETDEWEB)

    Stodola, J.

    1999-08-01

    This paper discusses fundamentals of corrosion protection in boilers, different boiler water treatments used by the utility industry to achieve this objective as well as limitations boiler designs may impose on long term boiler performance. The purpose there is to determine whether chemists have the ability to guarantee reliable and problem free operation of any boiler. (orig.) [German] Dieser Artikel diskutiert die Grundlagen des Korrosionsschutzes in Kesseln, die verschiedenen von den Kraftwerken angewandten Kesselwasser-Fahrweisen und die Auswirkung der Kesselauslegung auf das langfristige Kesselverhalten. Es wird ueberlegt, ob Chemiker einen zuverlaessigen und problemfreien Betrieb eines jeden Kessels garantieren koennen. (orig.)

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

    International Nuclear Information System (INIS)

    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 NOX 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

  7. Vigilancia sanitaria del agua: un nuevo enfoque para municipalidades de Costa Rica

    Directory of Open Access Journals (Sweden)

    Carmen Valiente

    1999-12-01

    Full Text Available Los programas de vigilancia sanitaria constituyen el nuevo enfoque para complementar los programas de control de calidad del agua y consisten en la aplicación de una metodología que permite determinar el grado de riesgo para la salud que presentan los sistemas de agua para consumo humano. En el presente trabajo se presenta el desarrollo y adaptación de un Programa de Vigilancia Sanitaria para ser utilizado en Costa Rica. Este programa se basa principalmente en determinar el grado de riesgo para la salud que posee un acueducto, relacionando el nivel de contaminación fecal con el grado de la inspección sanitaria obtenido a partir de encuestas de campo. Los alcances del programa son proveer una plataforma para dar prioridad racional a las inversiones en el sector agua y unifica esfuerzos entre los dos roles importantes en esta área, el de las instituciones encargadas del abastecimiento de agua y el ente rector o autoridad reguladora en el campo del agua y la salud. Inicialmente, para implementar este programa se seleccionaron las Municipales de Costa Rica, de las 81 municipalidades existentes, 37 operan sistemas de suministro de agua para un total de 243 acueductos. El programa fue implementado durante los años 1996 y 1997. Se presentan para ilustración los resultados obtenidos en dos acueductos pertenecientes a las municipalidades de Cartago y San Marcos de Tarrazú. La ventaja de este tipo de programas sobre otros de control de calidad, radica principalmente en poder determinar el estado en que se encuentran las estructuras del acueducto y no solo su calidad, con el fin de establecer las prioridades para una inversión eficiente de los recursos existentes y así evitar la exposición de los usuarios a enfermedades de transmisión hídrica.

  8. Genotoxicidad del agua contaminada por plaguicidas en un área de Antioquia

    Directory of Open Access Journals (Sweden)

    Flor Tobón M.

    2011-05-01

    Full Text Available Objetivo. Determinar genotoxicidad del extracto orgánico de recursos hídricos de la vereda Monterredondo (Antioquia, contaminados por el uso de pesticidas en la agricultura, en la producción porcina y avícola como un diagnóstico de su calidad para entender su influencia en estas fuentes de agua en el municipio de San Pedro de Los Milagros (Antioquia. Materiales y métodos. Se empleó el ensayo cometa para establecer fragilidad osmótica de eritrocitos, viabilidad celular y alteración del ADN de linfocitos humanos al incubar estas células en agua recogida de tres fuentes hídricas de la vereda Monterredondo en el laboratorio de Bioquímica de la Facultad de Medicina de la Universidad de Antioquia. Resultados. El análisis de los datos de la longitud del cometa del extracto orgánico de las tres muestras, indicaron genotoxicidad. Este efecto fue dependiente de la concentración del extracto y del sitio de muestreo (p<0.001. La muestra de agua de la quebrada el Hato, presentó el mayor efecto genotóxico a 4 y 37ºC; la muestra de agua de la planta de tratamiento de la Hacienda La Montaña, presentó una alta genotoxicidad relativa, comparada con la muestra de agua de la quebrada Fray Juana. Conclusiones. El análisis de las tres muestras de agua recogidas en la vereda Monterredondo reveló genotoxicidad. Sin embargo, se sugiere en el futuro evaluar el grado de toxicidad de los componentes orgánicos concentrados y la genotoxicidad en personas que la consumen.

  9. Aguaclara, una alternativa para el tratamiento de agua para consumo humano. Aguaclara - an alternativefor drinking water treatment.

    Directory of Open Access Journals (Sweden)

    Gilberto Arturo Díaz Ordóñez

    2011-05-01

    Full Text Available Agua Para el Pueblo con el apoyo técnico del Programa AguaClara de la Universidad de Cornell, facilita asistencia técnica a comunidades rurales mayores de 2,000 habitantes y pequeñas y medianas ciudades con poblaciones menores de 50,000 habitantes, para la construcción de plantas de tratamiento denominadas AguaClara. Este esfuerzo institucional es una respuesta para optimizar la desinfección del agua con cloro en aquellos sistemas de agua ya construidos y que por razones naturales o antropicas se han visto afectados con problemas de alta turbiedad en los suministros de agua. La tecnología consiste en la floculación hidráulica, la sedimentación de alto rendimiento y la desinfección con alta eficiencia, sin el uso de la filtración o energía eléctrica para asegurar una entrega de agua de acuerdo a la Norma Técnica Nacional de Calidad del Agua de Honduras. La gestión de las plantas de tratamiento AguaClara va más allá de los aspectos constructivos y enfatiza simultáneamente la organización comunitaria, la capacitación de los diferentes actores, la readecuación de las tarifas, la operación y mantenimiento del sistema incluyendo la planta de tratamiento, así como la mitigación de las vulnerabilidades del sistema de agua y la protección sanitaria y ambiental en general de los entornos comunitarios donde se construyen las plantas de tratamiento.

  10. 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…

  11. Creep in boiler materials: mechanisms, measurement and modelling

    Czech Academy of Sciences Publication Activity Database

    Sklenička, Václav; Kloc, Luboš

    Cambridge: Woodhead Publishing Limited, 2011 - (Oakey, J.), s. 1-684 ISBN 978-1-84569-726-6 Institutional research plan: CEZ:AV0Z20410507 Keywords : creep * creep-resistant materials * boiler steels * degradation mechanisms * creep testing * prediction of creep life Subject RIV: JG - Metallurgy

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

    International Nuclear Information System (INIS)

    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

  13. 46 CFR 61.05-10 - Boilers in service.

    Science.gov (United States)

    2010-10-01

    .... When a hydrostatic test is required, the marine inspector may examine all accessible parts of the... question, shall be subjected to a hydrostatic test of 11/2 times the maximum allowable working pressure. All other boilers shall be subjected to a hydrostatic test of 11/4 times the maximum allowable...

  14. 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....

  15. 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...

  16. 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...

  17. Modelling of boiler heating surfaces and evaporator circuits

    DEFF Research Database (Denmark)

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

    2002-01-01

    Dynamic models for simulating boiler performance have been developed. Models for the flue gas side and for the evaporator circuit have been developed for the purpose of determining material temperatures and heat transfer from the flue gas side to the water-/steam side in order to simulate the...

  18. Karakteristik Pembakaran Beberapa Jenis Biomassa dalam Fluidized Bed Boiler

    OpenAIRE

    Mahidin Mahidin; Hamdani Hamdani; Muhtadin Muhtadin; Muhammad Faisal; Mahyuddin Mahyuddin

    2014-01-01

    Pembakaran biomassa dalam rangka memproduksi energi termal untuk menghasilkan utilitas lain dapat dilakukan dengan mengkonversi energi tersebut ke bentuk energi lain. Boiler dengan unggun terfluidisasi dipilih sebagai teknologi konversi energi termal menjadi energi listrik, karena kukus yang diproduksi dapat digunakan untuk menggerakkan turbin yang dikopling dengan generator listrik. Unit dimana proses pembakaran berlangsung, yaitu ruang bakar dan freeboard dipilih sebagai target pengamatan u...

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

    Science.gov (United States)

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

    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.

  20. Tratabilidad de aguas residuales de matadero con filtros

    Directory of Open Access Journals (Sweden)

    Jesús Mario Ortiz A.

    2011-06-01

    Full Text Available Para estudiar la tratabilidad anaeróbica de las aguas residuales provenientes de un matadero de ganado vacuno, se emplearon un sistema de dos filtros en serie y un tercer filtro único como testigo. Con valores promedio de carga orgánica volumétrica y tiempo de retención de 1.6 kg/(m3*d y 26 horas respectivamente, las eficiencias de remoción de DQO total fueron similares en el filtro único y en el sistema en serie, del orden del 64% en promedio. Así mismo, la retención y acumulación de sólidos biológicos en el lecho, se mostro como la vía principal de remoción de la DQO. La diferenciación del proceso lograda con los dos filtros en serie permitió establecer que la mayor parte de la acumulación ocurrió en el filtro primario, en tanto que lo fundamental de la bioconversion en metano se produjo en el filtro secundario del sistema en serie. EI bajo nivel relativo de metanogenización obtenido podría explicarse por las limitaciones a la actividad de la biomasa metanogénica impuestas por las bajas temperaturas, aunque no se podría descartar una probable inhibición por los productos de hidrolisis de las grasas acumuladas: Resumen del Proyecto de Tesis Presentado por el autor Para optar al titulo de Magister en Ambiental. Dirección: Consuelo Díaz, Bióloga; M.S.c. U.N. Facultad de Ingenieria.1992.

  1. Agua Caliente Wind/Solar Project at Whitewater Ranch

    Energy Technology Data Exchange (ETDEWEB)

    Hooks, Todd; Stewart, Royce

    2014-12-16

    Agua Caliente Band of Cahuilla Indians (ACBCI) was awarded a grant by the Department of Energy (DOE) to study the feasibility of a wind and/or solar renewable energy project at the Whitewater Ranch (WWR) property of ACBCI. Red Mountain Energy Partners (RMEP) was engaged to conduct the study. The ACBCI tribal lands in the Coachella Valley have very rich renewable energy resources. The tribe has undertaken several studies to more fully understand the options available to them if they were to move forward with one or more renewable energy projects. With respect to the resources, the WWR property clearly has excellent wind and solar resources. The DOE National Renewable Energy Laboratory (NREL) has continued to upgrade and refine their library of resource maps. The newer, more precise maps quantify the resources as among the best in the world. The wind and solar technology available for deployment is also being improved. Both are reducing their costs to the point of being at or below the costs of fossil fuels. Technologies for energy storage and microgrids are also improving quickly and present additional ways to increase the wind and/or solar energy retained for later use with the network management flexibility to provide power to the appropriate locations when needed. As a result, renewable resources continue to gain more market share. The transitioning to renewables as the major resources for power will take some time as the conversion is complex and can have negative impacts if not managed well. While the economics for wind and solar systems continue to improve, the robustness of the WWR site was validated by the repeated queries of developers to place wind and/or solar there. The robust resources and improving technologies portends toward WWR land as a renewable energy site. The business case, however, is not so clear, especially when the potential investment portfolio for ACBCI has several very beneficial and profitable alternatives.

  2. Agua Para Todos: A New Regionalist Hydraulic Paradigm in Spain

    Directory of Open Access Journals (Sweden)

    Elena Lopez-Gunn

    2009-10-01

    Full Text Available This paper reviews the hydraulic paradigm in Spain and its evolution over the last 100 years to the current decentralisation process of "agua para todos", i.e. where different regional governments vie for control over 'scarce' water resources and defining the concept of hydro-solidarity between regions. Recent events seem to point to a new hydraulic bureaucracy at the sub-national level due to the political devolution currently taking place in Spain, where water has an increased political value in electoral terms. Water has strategic importance in single-issue politics and territorial identity, as compared to traditional left/right ideological politics for both national and regional parties in the Spanish multilevel electoral system. This refers to an important aspect of water politics – openly discussed in Spain but rarely analysed – namely the 'political returns' on water (or 'political rent-seeking'. This also points to spatial dimensions of the definition of state, identity, and access to resources in a semiarid country. This historical process of decentralisation of water is highlighted with particular reference to key events in recent Spanish history, including the Hydraulic Plan of the 1930s, its reappearance in the 1993 National Hydrological Plan, a revised version in the year 2001, and a final change in paradigm in 2005 at the national level. This suggests that the hydraulic paradigm is re-enacted at the regional government level. It is argued that a multi-scalar analysis of Spanish water decentralisation is essential in order to understand change and stasis in public policy paradigms related to water.

  3. Caracterización de las aguas residuales de la planta refinadora de aceites comestibles ERASOL

    Directory of Open Access Journals (Sweden)

    Arelis Abalos

    2007-01-01

    regulaciones de la Norma Cubana para el vertido en cuerpos receptores marinos. Los análisis demostraron que la bahía recibe la descarga de aguas residuales de ERASOL con un pH de 9,7 unidades, 40232,50 mg/L de materia orgánica, 18537,13 g/L de aceites y 0,2 mL/L de sólidos sedimentables. Estos resultados evidenciaron que las aguas residuales de la planta de aceites ERASOL no cumplen con las especificaciones de la norma de vertido en cuerpos marinos.

  4. ACERCAMIENTO AL SABER CIENTÍFICO EN EDUCACIÓN INFANTIL: EL AGUA

    OpenAIRE

    Aguilera-Gómez, Carmen

    2014-01-01

    El agua es un elemento esencial para la vida de todos los seres vivos. Cada vez es más necesario planificar desde las escuelas hábitos responsables que transmitan experiencias y reflexiones sobre la importancia del agua en nuestras vidas. Este trabajo pretende introducir a los alumnos de tercer curso del segundo ciclo de educación infantil la aplicación del método científico como técnica que fomenta la adquisición y desarrollo de las capacidades en los alumnos, impulsando el desarrollo integr...

  5. Gestión del agua y viabilidad de los sistemas productivos

    OpenAIRE

    Quiroga, Alberto; Gaggioli, Carolina

    2010-01-01

    En general la investigación en gestión del agua se ha orientado al desarrollo de prácticas para mejorar la eficiencia de uso en sistemas irrigados y en la sistematización de cuencas y pendientes para mejorar la captación en áreas afectadas por procesos de erosión hídrica. Comparativamente la gestión del agua en producciones agrícolas y ganaderas de secano muestra un menor desarrollo, a pesar de que en regiones semiáridas y subhúmedas constituye el principal factor que condiciona tanto la prod...

  6. Abastecimiento de agua y depósito regulador en Fuente el Saz de Jarama (Madrid)

    OpenAIRE

    Muslera López, Elena

    2012-01-01

    El presente proyecto consiste en el abastecimiento de agua potable de una urbanización de nueva construcción que va a realizarse en el municipio de Fuente el Saz de Jarama (Madrid). La primera parte consiste en preparar el terreno donde está situada la urbanización, esta preparación se basa en dotar de acceso a la urbanización y realizar los movimientos de tierra necesarios para igualar el terreno con las necesidades de la zona. La segunda parte, trata de abastecer de agua potable a la ...

  7. Procesos de eliminación de contaminantes en aguas potabilizables

    OpenAIRE

    Acebrón Arribas, Francisco Javier

    2010-01-01

    El presente proyecto consiste en la preparación de los cálculos y planos necesarios para la realización de una estación de tratamiento de agua para su potabilización y posterior consumo doméstico, con la utilización del carbón activo como tratamiento de afino. Tanto los cálculos como los planos del presente proyecto se centran en el sistema y complementos necesarios para el tratamiento del agua potable y para el sistema de almacenamiento de los componentes que se requieren ...

  8. Biotratamiento de las aguas residuales de una planta de enlatado de vegetales

    OpenAIRE

    Ruiz Colorado, Angela Adriana

    2001-01-01

    Resumen: En este trabajo se evaluó la efectividad de cultivos mixtos comerciales utilizados para el tratamiento de las aguas residuales de una de las empresas comercializadora de estos en Colombia. La entrada de ellos al país ha ocasionado un cambio en los tratamientos tradicionalmente anaerobios de las aguas residuales industriales, siendo reemplazados por tratamientos aerobios -facultativos. Para su aplicación en esta investigación se realizó inicialmente la caracterización fisicoquímica y ...

  9. Planes de seguridad del agua. fundamentos y perspectivas de implementación en colombia

    OpenAIRE

    Pérez Vidal, Andrea; Torres Lozada, Patricia; Cruz Vélez, Camilo Hernán

    2010-01-01

    El agua para consumo humano debe estar libre de organismos patógenos, sustancias químicas, impurezas y cualquier contami- nante que cause problemas a la salud humana. América Latina y el Caribe (ALC) presentan problemas de calidad por deficien- cias en la operación, mantenimiento y continuidad de los servicios, incorrecto funcionamiento de las plantas de tratamiento y precariedad de las redes de distribución e instalaciones domiciliarias. Las tendencias mundiales del sector agua potable es...

  10. Hydro geochemistry of uranium in Aguas de Lindoia (Sao Paulo State)

    International Nuclear Information System (INIS)

    A preliminary investigation concerning to the geochemical behaviour of uranium isotopes (233 U and 238 U) was performed on spring waters for Aguas de Lindoia city, Sao Paulo State. The reason for this study is because the natural radioactivity of these waters is poorly known, and no uranium content data have been published. Measurements of Uranium-238 contents and 234 U/238 U activity ratios in groundwaters were performed on the following springs issuing in the urban area from Aguas de Lindoia: Levissima I, Levissima II, Beleza, Sao Roque, Lindalia and Santa Izabel. (author)

  11. Derecho humano al agua y al saneamiento: derechos estrechamente vinculados al derecho a la vida

    OpenAIRE

    Fernández Aller, Maria Celia; Luis Romero, Elena de; Guzmán Acha, Cristina

    2013-01-01

    Los derechos humanos al agua y al saneamiento están íntimamente relacionados con otros derechos esenciales para la vida, como la alimentación o la salud. Su reconocimiento como derechos humanos en 2010 marca un hito importante en el respeto, protección y realización de estos derechos, que se encuentran seriamente vulnerados para una mayoría de población más vulnerable y empobrecida, sobre todo en el ámbito rural. Mucho camino queda aún para conseguir no sólo la disponibilidad de agua y saneam...

  12. Tratamiento de aguas residuales por humedales artificiales tropicales en Tabasco, México

    Directory of Open Access Journals (Sweden)

    Cristian Marín Acosta

    2016-05-01

    Full Text Available En las dos últimas décadas, los humedales artificiales han incrementado mundialmente su desarrollo para el tratamiento de aguas residuales. En el presente estudio, doce humedales artificiales tropicales de flujo subsuperficial (HAFS fueron diseñados y operados específicamente para el tratamiento de aguas residuales domésticas. La eficiencia de remoción de contaminantes básicos (DBO5, DQO, SST, NT, PT, Turbiedad y Color fue evaluada bajo tres tratamientos: 1 Pontederia cordata (HAFS-Tule, 2 Phragmites australis (HAFS-Carrizo y 3 grava como prueba testigo (HAFS-Grava.

  13. Agua y saneamiento rural: Oportunidades para la participación comunitaria en Colombia

    OpenAIRE

    Claudia Useche Melo

    2012-01-01

    Esta Nota no pretende hacer un análisis exhaustivo sobre las causas de la problemática de cobertura rural, sino más bien mostrar algunos de los aspectos a considerar en el diseño de nuevas intervenciones en la prestación de servicios de agua y saneamiento en zonas rurales, valiéndose de las experiencias contenidas en los estudios de caso presentados durante la Semana Sectorial de Agua del Banco Interamericano de Desarrollo (BID), llevada a cabo en Santiago de Chile en abril de 2011, y de expe...

  14. Estación depuradora del agua de abastecimiento a Córdoba

    Directory of Open Access Journals (Sweden)

    Barrón Egusquiza, Pablo

    1958-05-01

    Full Text Available Por Orden ministerial del 1 de septiembre de 1951 comenzó a redactarse el proyecto definitivo del abastecimiento de agua a la ciudad de Córdoba. En el abastecimiento existente por aquella época, las múltiples procedencias del agua, aportaciones, casi todas, de pequeño caudal, sin garantía alguna respecto a su posible contaminación, tenían como consecuencia la aparición periódica de epidemias que se propagaban rápidamente.

  15. Respuesta productiva del guayabo al manejo del agua en condiciones de agricultura urbana

    OpenAIRE

    Geisy Hernández; Jeny Pérez; Roberto Martínez; Teresa López

    2010-01-01

    El presente trabajo resume los resultados de investigación que definen el manejo de los requerimientos del agua de riego para el cultivo del guayabo en condiciones de agricultura urbana. Se tomó como área piloto la Unidad Básica de Producción Cooperativa (UBPC) Celia Sánchez del municipio Habana del Este. La entrega de agua al cultivo se realizó con un sistema de riego localizado, empleando la técnica de riego por goteo. El mismo se manejó con dosis fijas e intervalos fijos tomando como refer...

  16. PREVENCIÓN DE LA LEGIONELOSIS EN SISTEMAS DE REFRIGERACIÓN DE AGUA

    OpenAIRE

    ENRIQUE GEA-IZQUIERDO

    2011-01-01

    Los sistemas de refrigeración de agua constituyen unas de las fuentes principales de desarrollo de la bacteria Legionella . El sur de España (Comunidad Autónoma de Andalucía, Málaga) presenta enclaves industriales y turísticos, con gran afluencia de personas, que disponen las instalaciones de riesgo. El análisis del grado de control y desinfección del agua se presenta como un indicador preventivo frente al desarrollo del agente biológico, recogido en la normativa nacional. Mediante un estudio...

  17. Medida de la concentración de actividad Alfa/Beta grueso, en agua potable

    OpenAIRE

    Zutta Villate, Julián Mateo

    2014-01-01

    Introducción: La calidad del agua de consumo humano es de creciente interés en el mundo; para que esta pueda ser considerada como potable, debe ajustarse a ciertos niveles biológicos, químicos, físicos y radiológicos. Siguiendo recomendaciones de organismos internacionales de salud o, a estándares emitidos por cada país, establecidos según sus condiciones tanto ambientales, como socioeconómicas. La Organización Mundial de la Salud (OMS), en sus guías de potabilización del agua de consu...

  18. COSTUMBRES COMUNES, DERECHOS INDIVIDUALES. BARRIOS Y AGUA EN IZÚCAR, PUEBLA

    OpenAIRE

    Francisco Javier Gómez Carpintero

    2002-01-01

    Este trabajo analiza una forma de organización local para el uso del agua en los barrios de Izúcar de Matamoros, Puebla, la cual fue transformada en las dos primeras décadas de la etapa posrevolucionaria. El estudio es una buena oportunidad para entender los procesos de formación del Estado y la comunidad nacional y su articulación a los poderes locales; en este caso a partir de las políticas barriales en torno al control del agua federal para riego

  19. Las características del mercado de derechos de agua en España

    OpenAIRE

    Antonio Embid Irujo

    2013-01-01

    Por diversas circunstancias el derecho español conoce desde 1999 de una regulación jurídica de los mercados de derechos de uso de aguas. De ellos se ha hecho bastante utilización durante la última gran sequía (2005-2009) y la experiencia ha sido favorable. La regulación de los mercados intenta evitar la especulación y el acaparamiento de derechos. Sin que sea gran cantidad de agua la que se mueve por razón de los mercados, sí que es suficiente para evitar graves inconvenientes y, con el adecu...

  20. Vigilancia sanitaria del agua: un nuevo enfoque para municipalidades de Costa Rica

    OpenAIRE

    Carmen Valiente

    1999-01-01

    Los programas de vigilancia sanitaria constituyen el nuevo enfoque para complementar los programas de control de calidad del agua y consisten en la aplicación de una metodología que permite determinar el grado de riesgo para la salud que presentan los sistemas de agua para consumo humano. En el presente trabajo se presenta el desarrollo y adaptación de un Programa de Vigilancia Sanitaria para ser utilizado en Costa Rica. Este programa se basa principalmente en determinar el grado de riesgo pa...