Evaluation of decrease in coal char gesification rate constant at final stage of gasification by a model assuming two activity-different reactants.

概要

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A reaction model is proposed to evaluate the decrease in the gasification reaction rate constant observed in the final stage of coal char gasification. The model assumes that two components of char having different reactivities for gasification are formed as a result of coal pyrolysis. A component (C1) with the higher reactivity is assumed to convert directly to gases while another (C2) with the lower reactivity to convert to gases via a less reactive solid intermediate. The model has been tested for kinetic data of CO2 or steam gasification observed for four different kinds of coal chars, a commercial graphite and a calcinated pitch coke at temperatures from 1073 to 1273K and under pressures of 0.8 and 1.6MPa. The results of comparison between conversions observed and estimated by the present model showed that the model explains well the decrease in the reaction rate constant as well as the effect of char natures. Furthermore, the model was found to give more accurate description of the data than our previous empirical model based on a modified unreacted-core model.
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