Kinetic models comparison for steam gasification of different nature fuel chars |
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Authors: | J Fermoso B Arias C Pevida M G Plaza F Rubiera J J Pis |
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Institution: | (1) Instituto Nacional del Carbón, CSIC. Apartado 73., 33080 Oviedo, Spain |
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Abstract: | The reactivity in steam of five different types of solid fuels (two coals, two types of biomass and a petcoke) has been studied.
The fuel chars were obtained by pyrolysis in a fixed-bed reactor at a temperature of 1373 K for 30 min. The gasification tests
were carried out by thermogravimetric analysis (TG) at different temperatures and steam concentrations. The reactivity study
was conducted in the kinetically controlled regime and three representative gas-solid models, volumetric model (VM), grain
model (GM) and random pore model (RPM), were applied in order to describe the reactive behaviour of the chars during steam
gasification.
The kinetic parameters of these models were derived and the ability of the models to predict conversion and char reactivity
during gasification was assessed. The best model for describing the behaviour of the samples was the RPM. The effect of the
partial pressure of steam in gasification was studied, and the reaction order with respect to steam was determined. The reactivity
of the chars was compared by means of a reactivity index. Biomass exhibited a higher reactivity than coals and petcoke. However,
significant differences in reactivity were observed between the two types of biomass used, which could be due to catalytic
effects. |
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Keywords: | biomass char gasification coal kinetic models petcoke |
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