Gasification kinetics of coals and wood |
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Authors: | D P C Fung Sang D Kim |
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Affiliation: | (1) Energy Research Laboratories, CANMET, Energy, Mines and Resources Canada, K1A OG1 Ottawa, Canada;(2) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 136-791 Seoul, Korea |
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Abstract: | The chemical reactivity and kinetics of nine Canadian coal samples ranking from lignite to semianthracite and one wood sample
were examined in a fixed gasifier in the presence of air and steam at 950–1000°C. The reactivity of the coal and wood samples
decrease with an increase in carbon content, but increase with increasing oxygen content of the parent coal. The reaction
velocity decreases with an increase in carbon content of the coal. The reaction mechanism based on the shrinking core model
for the present gasification has been found to be chemical reaction controlled for the coal-steam-air system and ash-layer
diffusion controlled for the wood-steam-air system. The present reaction system favors the water gas shift reaction based
on the chemical composition of the product gas from the gasification. |
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Keywords: | |
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