Sample records for GRADOS DEL CARBON (coal rank)
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1

Cambios morfológicos de carbones pulverizados durante su desvolatilización/ Morphological changes of pulverized coals during their devolatilization

Rojas, Andrés; Barraza, Juan; Barranco, Richelieu
2010-03-01

Resumen en español El objetivo de este estudio fue evaluar la influencia del rango de carbón, la temperatura y el tiempo de desvolatización sobre la morfología de los carbonizados. Los carbonizados se obtuvieron de tres carbones de diferentes rangos a tiempos de 100, 150 y 300 ms, temperaturas de 900, 1000 y 1100 ºC, en atmósfera de nitrógeno con una velocidad de calentamiento del orden de 10(4) ºC/min. La morfología de los carbonizados se observó por medio de análisis de imágene (mas) s y microscopía de barrido electrónico. Se encontró que los compuestos volátiles liberados se incrementaron con la temperatura y el tiempo de desvolatilización, y depende del rango del carbón. Además, se observó que existe relación entre el rango del carbón, la porosidad y el espesor medio de pared de los carbonizados. Al aumentar el rango del carbón y la temperatura de desvolatilización, el espesor medio de pared y tamaño de partícula del carbonizado aumenta. También se encontró plasticidad sobre las superficies de las partículas con porosidad cerrada, así como también aglomeración y fusión entre partículas de carbonizado, encontrándose partículas más pequeñas en su interior. Resumen en inglés The aim of this study was to evaluate the influence of coal rank, temperature and time devolatilization on char morphology. Chars were obtained from three different coals rank at 100, 150 and 300 ms time devolatilisation, 900, 1000 and 1100 ºC temperature, using nitrogen atmosphere and a rate heating of 10(4) ºCmin-1. Char morphology was observed through image analysis and scanning electron microscopy. It was found that released volatile compounds depended of coal rank (mas) and increased with temperature and devolatilisation time. In addition, it was observed that there is a relationship between coal rank, porosity and char half thickness wall. Thus, coal rank and devolatilization temperature increase by increasing the average wall thickness and char particle size. It was also found that plasticity occurred on particle surfaces with closed porosity, as well as agglomeration and fusion between char particles having small particles inside them.

Scientific Electronic Library Online (Spanish)

2

Caracterización morfológica del carbonizado de carbones pulverizados: estado del arte/ Char morphology characterization from pulverized coal: a review

Rojas, Andrés; Barraza, Juan
2007-09-01

Resumen en español El carbonizado es el residuo sólido que resulta de la extracción de la materia volátil del carbón a altas temperaturas, en atmósfera inerte y cortos tiempo de residencia (proceso de desvolatilización). La desvolatilización generalmente se lleva a cabo en reactores de lecho fluidizado, reactores tubulares de caída o en mallas eléctricas. Las condiciones de operación como tipo de atmósfera, velocidad de calentamiento, temperatura y presión en estos equipos, junt (mas) o con las características del carbón como el rango, composición petrográfica y tipo de microlitotipos, generan cambios morfológicos en la estructura del carbonizado produciendo diferentes tipos de residuo sólido. Estas diferencias morfológicas afectan en forma directa las características del proceso de combustión. En este artículo se presenta el desarrollo histórico de la clasificación de las diferentes morfologías de carbonizados, las cuales inicialmente fueron realizadas en forma manual y actualmente se lleva a cabo por medio de análisis de imagen en forma automática. Se encontró que hay diferencias en las clasificaciones reportadas en la literatura, por lo cual la International Committee for Coal and Organic Petrology (ICCP) presenta un sistema de clasificación unificado. Resumen en inglés Char is the solid remainder from coal when subjected to volatile matter extraction at high temperatures in inert atmosphere and at short residence time (devolatilisation process). Generally, this process is carried out in fluidized bed reactors, in drop tube furnace and electrical meshes. The operation conditions, such as atmosphere type, heating rate, temperature and pressure, and coal characteristics, such as rank, petrographic composition and microlitotypes, produce mo (mas) rphologic changes in the char structure and different solid remainder types is obtained. These morphologic differences directly affect the combustion process characteristics. In this paper, the historical development of the char morphologies classification is summarized. Initially, the classification was carried out by manual analysis, and actually automatic image analysis is used. However, different classifications were reported in the literature, which led to the need for a unified system of classification. Recently, ICCP (International for Committee Coal and Organic Petrology) introduced a morphology char classification system.

Scientific Electronic Library Online (Spanish)

3

Tracing the combustion of coal blends in a thermobalance by optical microscopy

Osório, Eduardo ; Ghiggi, M.L.F. ; Vilela, Antonio C. F. ; Kalkreuth, Wolfgang D. ; Álvarez Rodríguez, Diego

Combustion at programmed temperature in a thermobalance is a common test for the rapid assessment of coal combustibility. In this study two series of blends (low rank/medium rank coal-AB and low rank /petroleum coke-AC) with the low rank coal in three different proportions (1/4, 2/4 and 3/4) have be...

DRIVER (Spanish)

4

Tracing the combustion of coal blends in a thermobalance by optical microscopy

Osório, Eduardo; Ghiggi, M. L. F.; Vilela, Antonio C. F.; Kalkreuth, W. D.; Álvarez Rodríguez, Diego; Gómez Borrego, Ángeles
2007-01-01

Digital.CSIC (Spain)

5

The investigation of chemical structure of coal macerals via transmitted-light FT-IR microscopy by X. Sun

Hower, James C.; Suárez Ruiz, Isabel; Mastalerz, Maria; Cook, Alan C.
2007-08-01

Digital.CSIC (Spain)

6

Suitability of Gray-King pyrolysis to evaluate coking pressure

Casal Banciella, M.ª Dolores; Díez Díaz-Estébanez, M.ª Antonia; Álvarez García, Ramón; Barriocanal Rueda, Carmen
2007-05-01

Digital.CSIC (Spain)

7

Slag and ash chemistry after high-calcium lignite combustion in a pulverized coal-fired power plant

Papastergios, Georgios; Fernandez-Turiel, J. L.; Georgakopoulos, Andreas; Gimeno, D.
2007-03-01

Digital.CSIC (Spain)

8

Primary tar of different coking coal ranks

Casal Banciella, M.ª Dolores; Díez Díaz-Estébanez, M.ª Antonia; Álvarez García, Ramón; Barriocanal Rueda, Carmen
2008-08-08

Digital.CSIC (Spain)

9

Oxy-combustion of high rank coals

Gómez Borrego, Ángeles ; Álvarez Rodríguez, Diego ; Fernández Domínguez, Isabel ; Ballesteros, Juan Carlos

One of the ways to face the abatement of CO2 emissions in power plants is the combustion of coal using oxy-fuel technology. In this case coal would be burned in a O2/CO2 atmosphere and the flue gas would consist mainly of CO2 which after condensation of water could be quasy-ready for storage. Most o...

DRIVER (Spanish)

10

Oxy-combustion of high rank coals

Gómez Borrego, Ángeles; Álvarez Rodríguez, Diego; Fernández Domínguez, Isabel; Ballesteros, Juan Carlos; Menéndez López, Rosa M.ª
2007-01-01

Digital.CSIC (Spain)

11

Oxicombustión de carbones bituminosos frente a combustión convencional. Características de los carbonizados

Gómez Borrego, Ángeles; Álvarez Rodríguez, Diego; Fernández Domínguez, Isabel; Menéndez López, Rosa M.ª
2007-01-01

Digital.CSIC (Spain)

12

Non-isothermal combustion behaviour of coal blends in a thermobalance as seen by optical microscopy

Osório, Eduardo; Ghiggi, M. L. F.; Vilela, Antonio C. F.; Kalkreuth, W. D.; Gómez Borrego, Ángeles
2008-06-12

Digital.CSIC (Spain)

13

Modofications to the surface chemistry of Low-rank Coal-Based carbon Catalysts to improve flue gas nitric oxide removal

Izquierdo Pantoja, María Teresa ; Rubio Villa, Begoña

The effectiveness of carbons as low temperatures SCR catalyst will depend upon their physical and chemical properties. Surface functional groups containing oxygen are closely related to the catalytic activity of carbons. These groups are expected to change the interaction between the carbon surface...

DRIVER (Spanish)

15

Materiales carbonosos para el control de contaminantes orgánicos y atmosféricos. Diseño y rendimiento.

Mastral Lamarca, Ana María; Murillo Villuendas, Ramón; Navarro Lopez, María Victoria
2003-05-01

Digital.CSIC (Spain)

16

Low volatile coal combustion under oxy-fuel atmosphere

Gómez Borrego, Ángeles; Álvarez Rodríguez, Diego; Fernández Domínguez, Isabel; Ballesteros, Juan Carlos; Menéndez López, Rosa M.ª
2007-01-01

Digital.CSIC (Spain)

17

Low cost coal-based carbons for combined SO2 and NO removal from exhaust gas

Izquierdo Pantoja, María Teresa ; Rubio Villa, Begoña ; Mayoral Gastón, María del Carmen ; Andrés Gimeno, José Manuel

journal page:http://www.elsevier.com/wps/find/journaldescription.cws_home/30420/description#description | The aim of this paper is to show how a cheap carbonaceous material such as low rank coal-based carbon (or char) can be used in thecombined SO2/NO removal from exhaust gas at the linear gas vel...

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18

Low cost coal-based carbons for combined SO2 and NO removal from exhaust gas

Izquierdo Pantoja, María Teresa; Rubio Villa, Begoña; Mayoral Gastón, María del Carmen; Andrés Gimeno, José Manuel
2003-09-04

Digital.CSIC (Spain)

19

Lead isotope ratios in Spanish coals of different characteristics and origin

Díaz Somoano, Mercedes ; Suárez Ruiz, Isabel ; Alonso, J. I. G. ; Ruiz Encinar, J. ; López Antón, M.ª Antonia

9 pages, 5 figures, 2 tables.-- Issue title: TSOP 2005 - Papers from the 22nd Annual Meeting of TSOP (Louisville, Kentucky, USA, Sep 11-15, 2005). | Lead isotope ratios in coals of different rank from several Spanish basins were estimated and related with their characteristics. The isotope Pb-206/Pb...

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20

Lead isotope ratios in Spanish coals of different characteristics and origin

Díaz Somoano, Mercedes; Suárez Ruiz, Isabel; Alonso, J. I. G.; Ruiz Encinar, J.; López Antón, M.ª Antonia; Martínez Tarazona, M.ª Rosa
2007-06-01

Digital.CSIC (Spain)

21

Influence of porosity and fissuring on coking pressure generation

Casal Banciella, M.ª Dolores ; Barriocanal Rueda, Carmen ; Díez Díaz-Estébanez, M.ª Antonia ; Álvarez García, Ramón

7 pages, 7 figures, 4 tables.-- Printed version published Sep 2008. | Nine bituminous coals of different rank and geographical origin were carbonized at pilot scale coke oven (300 kg) in order to study the pressure generated during coking. At the same time their contraction/expansion was assessed by...

DRIVER (Spanish)

22

Influence of porosity and fissuring on coking pressure generation

Casal Banciella, M.ª Dolores; Barriocanal Rueda, Carmen; Díez Díaz-Estébanez, M.ª Antonia; Álvarez García, Ramón
2008-04-10

Digital.CSIC (Spain)

23

Ignition characteristics of coal blends in an entrained flow furnace

Faúndez, J.; Arias Rozada, Borja; Rubiera González, Fernando; Arenillas de la Puente, Ana; García, X.; Gordon, A. L.; Pis Martínez, José Juan
2007-04-12

Digital.CSIC (Spain)

24

Geological controls on the mineral matter and trace elements of coals from the Fuxin basin, Liaoning Province, northeast China

Querol, Xavier; Alastuey, Andrés; López Soler, Ángel; Plana Llevat, Feliciano; Fernandez-Turiel, J. L.; Zeng, Rongshu; Xu, Wendong; Zhuang, Xinguo; Spiro, B.
1997-10-01

Digital.CSIC (Spain)

25

Genesis and rank distribution of Upper Carboniferous coal basins in the Cantabrian Mountains, Northern Spain

Colmenero, Juan Ramón ; Suárez Ruiz, Isabel ; Fernández-Suárez, Javier ; Barba, Pedro ; Llorens, Teresa

18 pages, 14 figures, 3 tables.-- Printed version published on Nov 3, 2008. | The Cantabrian Mountains located in the NW of the Iberian Peninsula constitute the most important coal-mining district of Spain. Anthracitic and bituminous coals (high and medium rank coals) have been mined in the area sin...

DRIVER (Spanish)

26

Genesis and rank distribution of Upper Carboniferous coal basins in the Cantabrian Mountains, Northern Spain

Colmenero, Juan Ramón; Suárez Ruiz, Isabel; Fernández-Suárez, Javier; Barba, Pedro; Llorens, Teresa
2008-08-15

Digital.CSIC (Spain)

27

Evaluation of the variables that influence mercury capture in solid sorbents

López Antón, M.ª Antonia; Abad Valle, Patricia; Díaz Somoano, Mercedes; Martínez Tarazona, M.ª Rosa
2007-01-01

Digital.CSIC (Spain)

28

Correlation between optical, chemical and micro-structural parameters of high-rank coals and graphite

Marques, M. ; Suárez Ruiz, Isabel ; Flores, D. ; Guedes, A. ; Rodrigues, S.

6 pages, 6 figures, 4 tables. -- Available online 4 July 2008. -- Issue title: CSCOP-TSOP-ICCP 2007: Selected papers from the 2007 joint meeting of CSCOP-TSOP-ICCP: Unconventional petroleum systems & advances in organic petrology and geochemistry (Victoria BC, Sunday, August 19th to Saturday August ...

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29

Correlation between optical, chemical and micro-structural parameters of high-rank coals and graphite

Marques, M.; Suárez Ruiz, Isabel; Flores, D.; Guedes, A.; Rodrigues, S.
2009-01-31

Digital.CSIC (Spain)

30

Comparison of hydrocarbon gases (C1–C5) production from Carboniferous Donets (Ukraine) and Cretaceous Sabinas (Mexico) coals

Alsaab, D.; Elie, M.; Izart, A.; Sachsenhoferb, R. F.; Privalov, V. A.; Suárez Ruiz, Isabel; Martínez, L.
2008-04-03

Digital.CSIC (Spain)

32

Comparison of coal chars prepared in different devices at similar temperature

Casal Banciella, M.ª Dolores ; Gómez Borrego, Ángeles ; Álvarez Rodríguez, Diego ; Menéndez López, Rosa M.ª

The characteristics of chars prepared in both a drop tube furnace (DTF) and a flat flame burner (FFB) at 1300 ºC from seven coals of different rank and maceral composition are the subject of this study.Coal samples sized and sieved to 36-75 μm were fed. The flame temperature of the FFB was achieved...

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33

Comparison of coal chars prepared in different devices at similar temperature

Casal Banciella, M.ª Dolores; Gómez Borrego, Ángeles; Álvarez Rodríguez, Diego; Menéndez López, Rosa M.ª
2007-01-01

Digital.CSIC (Spain)

34

Coal char combustion under a CO2-rich atmosphere: Implications for pulverized coal injection in a blast furnace

Gómez Borrego, Ángeles; Osório, Eduardo; Casal Banciella, M.ª Dolores; Vilela, Antonio C. F.
2008-06-06

Digital.CSIC (Spain)

35

Characterization of different origin coking coals and their blends by Gieseler plasticity and TGA

Díaz-Faes González, Elvira ; Barriocanal Rueda, Carmen ; Díez Díaz-Estébanez, M.ª Antonia ; Álvarez García, Ramón

6 pages, 9 figures, 3 tables. -- Printed version published Aug 2007 | Twenty-five bituminous coals of different rank and geographical origin together with seventeen blends (binary, ternary and quaternary) prepared with these coals were studied in terms of their thermoplastic properties, which were d...

DRIVER (Spanish)

36

Characterization of different origin coking coals and their blends by Gieseler plasticity and TGA

Díaz-Faes González, Elvira; Barriocanal Rueda, Carmen; Díez Díaz-Estébanez, M.ª Antonia; Álvarez García, Ramón
2007-02-28

Digital.CSIC (Spain)

37

Characteristics of high heating rate biomass chars prepared under N2 and CO2 atmospheres

Gómez Borrego, Ángeles; Garavaglia, L.; Kalkreuth, W. D.
2009-01-31

Digital.CSIC (Spain)

38

Char refiring under O2/N2 and O2/CO2 atmospheres. Implication for PCI injection in blast furnace

Álvarez Rodríguez, Diego; Casal Banciella, M.ª Dolores; Gómez Borrego, Ángeles; Osório, Eduardo; Vilela, Antonio C. F.
2007-01-01

Digital.CSIC (Spain)

39

Carbones activos con propiedades de tamiz molecular

Manso, R.; Pajares Somoano, Jesús Alberto; Guil, J. M.; Laynez, J.
2000-08-01

Digital.CSIC (Spain)

40

Caracterización de los lignitos garumnienses del Pirineo Central catalán.

García-Vallés, M.; González-Prado, J.; Vendrell-Sanz, M.
1993-01-01

Digital.CSIC (Spain)

41

Briqueteado de lignitos con aditivos: seguimiento físico-químico del proceso

Miranda Ibáñez, José L; Moliner Álvarez, Rafael; Blesa Moreno, Mª Jesús
2002-03-01

Digital.CSIC (Spain)

42

Applying TGA parameters in coke quality prediction models

Díaz-Faes González, Elvira; Barriocanal Rueda, Carmen; Díez Díaz-Estébanez, M.ª Antonia; Álvarez García, Ramón
2007-05-01

Digital.CSIC (Spain)

43

ANÁLISIS DE LIBERACIÓN DE LOS GRUPOS DE MACERALES DEL CARBÓN: CARBONES COLOMBIANOS/ ANALYSIS OF LIBERATION OF THE GROUPS OF MACERALES OF THE COAL: COLOMBIAN COALS.

GÓMEZ ROJAS, OLGA PATRICIA; CARMONA LÓPEZ, INÉS; BUSTAMANTE RÚA, OSWALDO
2007-11-01

Resumen en español Tres muestras de carbón de diferentes zonas carboníferas de Colombia fueron seleccionadas con el objeto de evaluar el grado de liberación de los grupos macerales en diferentes granulometrías. Se siguió el método empleado en los estudios de la liberación de minerales en rocas duras, el cual evalúa la proporción de componentes libres y mixtos, mediante el análisis petrográfico de los productos obtenidos durante la molienda. Las muestras analizadas corresponden a (mas) carbones de las zonas carboníferas de la Guajira Antioquia, y Boyacá, los dos primeros carbones clasificados como térmicos y el último como un carbón coquizable. Los grupos de macerales en el carbón, se comportan de forma similar a como que lo hacen los minerales constituyentes de las rocas durante la reducción de tamaño, encontrándose una tendencia al incremento de constituyentes libres. El análisis de liberación maceral muestra que la amplia variación de formas, tamaños y asociaciones (microlitotipos) que presentan los distintos grupos de macerales, .definen las proporciones de componentes libres y mixtos. El grupo maceral que presenta mayor probabilidad de encontrarse libre es la vitrinita, ya que es el maceral que está en mayor proporción, esto se evidencia en el dominio del microlitotipo vitrita en las distintas muestras; el segundo grupo es la inertinita especialmente para los carbones de Boyacá y La Guajira, la distribución de tamaño y forma de presentación de los macerales del grupo de la inertinita (tejidos particulados) favorecen su liberación. Las liptinitas por su estrecha asociación con la vitrinita y su baja proporción en los carbones de Boyacá y La Guajira, solo presentan un grado de liberación significativo en la muestra de Antioquia. Para obtener un mayor grado de liberación de los componentes es necesario llevar los carbones a granulometría inferiores a 10 micras. Resumen en inglés Three coal seams of different Carboniferous Zones from Colombia were selected with the intention of evaluating the degree of liberation of the macerals groups. The method used in the studies mineral liberation of the hard rock was followed. The analyzed samples correspond to coals of the Carboniferous Zones of La Guajira, Antioquia, and Boyacá, the analysis of liberation of the macerals was based on the results of the petrography analysis (determination of the percentage (mas) of free macerals and particles with mixed composition) of the samples with grain size mesh 230, 270, 325 and 400. During the pulverize the macerals groups in the coal present a tendency to the increase of free components. The liberation is not delimited at intervals of size, as usually happens in the minerals, the sizes oscillates between 5 and 350 microns for the liptinites and between 5 and 504 microns for the inertinites. The forms, sizes and associations (microlithotypes) that present the different groups from macerals, define the proportions of component free and mixed. The group maceral that presents greater probability of being frees is the vitrinite, because it is the maceral that is in greater proportion, this is demonstrated in the dominion of microlithotype vitrite in the different samples; the second group is the inertinite specially for the coals of Boyacá and La Guajira, the distribution of size and form of presentation of the macerals of the group of the inertinite (particle tissues) help their liberation. The liptinites by their association with the vitrinite and its low proportion in coals of Boyacá and La Guajira only present a significant degree of liberation in the sample of Antioquia. In order to receive a greater rank of liberation of the components it is necessary to take inferior coals to grain size a to 10 microns.

Scientific Electronic Library Online (Spanish)