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Título

Effect of the Pressure and Temperature of Devolatilization on the Morphology and Steam Gasification Reactivity of Coal Chars

AutorFermoso Domínguez, Javier ; Gil Matellanes, María Victoria ; Gómez Borrego, Ángeles ; Pevida García, Covadonga ; Pis Martínez, José Juan ; Rubiera González, Fernando
Palabras claveCoal rank
Pyrolysis pressure
Pyrolysis temperature
Char morphology
Steam gasification
Fecha de publicación5-oct-2010
EditorAmerican Chemical Society
CitaciónEnergy and Fuels 24(10): 5586-5595 (2010)
ResumenThe effect of operating conditions (pressure and temperature) on char morphology and structure during coal devolatilization was studied. For this purpose, five different rank coals were selected: a lignite, three bituminous coals, and a semi-anthracite. The coal chars were prepared by devolatilization in a novel pressurized fixed-bed reactor. The pyrolysis experiments were carried out isothermally at temperatures of 800, 900, and 1000 °C and pressures of 1, 5, 10, and 20 atm. The chars obtained from the bituminous coals at elevated pressure experienced a high degree of swelling, whereas those from the lignite and semi-anthracite were hardly affected at all by pressure. The devolatilization temperature did not appear to have any significant effect on char morphology below 1000 °C. The reactivity of the char samples prepared under different pyrolysis conditions was studied by isothermal thermogravimetric analysis at 1000 °C under a steam atmosphere. The chars obtained at elevated pressure were found to be more reactive than those produced at atmospheric pressure. An increase in the pyrolysis temperature led to a decrease in char reactivity.
DescripciónThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy and Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/ef100877t
Versión del editorhttps://doi.org/10.1021/ef100877t
URIhttp://hdl.handle.net/10261/172109
DOI10.1021/ef100877t
ISSN0887-0624
E-ISSN1520-5029
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