Abstract
Reaction rate data from gasification of a bituminous coal char in H 2O and H 2O/H 2 gas mixtures have been used to synthesize an overall reaction rate model with contributions of the reaction kinetics, the pore development and the surface deactivation. The initial reaction rates could be described as a function of pH 2O, pH 2 and T by a Langmuir-Hinshelwood/Hougen-Watson (LHHW) type rate expression. The development of the reaction rate as a function of the carbon conversion (reactivity profiles) could be described by the Random Pore Model, for gasification in H 2O. The effect of H 2 on the reactivity profile could be described by a lumped deactivation model which is represented by the exponential equation exp (aX), where a includes contributions of T, pH 2 and pH 2O. The model was successfully used in predicting temperature programmed reactivity profiles.
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