Kinetic Modeling of Biomass Gasification and Combustion
نویسنده
چکیده
This review critically examines char conversion kinetics in oxidizing or reducing atmosphere. In kinetic analysis the devolatilization of biomass and the conversion of char are usually investigated by means of separate experiments, although some kinetic models are also available of biomass combustion. The large majority of the char conversion kinetics consists of a global reaction with activation energies of 196-200kJ/mol (carbon dioxide gasification), 138-271kJ/mol (steam gasification), 75-229kJ/mol (char oxidation) and a power law dependence on the partial pressures of the gasifiying agents. The rate expressions usually also incorporate a structural contribution. The wide range of variation of kinetic parameters is due to the different char properties (biomass characteristics and pyrolysis conditions) and mainly to the simplifications introduced in the mathematical treatment of the data.
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