Abstract
Two steady state models have been developed for the simultaneous oxidation and gasification of a single coal char particle. Because of the uncertainty in the relative importance of solid phase and gas phase reaction kinetics in a gasifier environment, the models assume that the velocities for the gas phase oxidations of hydrogen and carbon monoxide are either zero or infinitely fast. The global rates and steady state multiplicities are discussed as functions of particle size, film thickness, gas composition and ambient temperature. The restriction of infinite hydrogen diffusivity assumed by previous investigators is removed. The two models lead to considerably different predictions about the maximum temperature of char particles in coal gasifiers.
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