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Steam Catalytic Gasification Kinetics of the Hohhot Coals

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The effects of temperature on the steam gasification of the Hohhot coal and saturated addition of KOH catalyst were investigated by thermo gravimetric-differential scanning calorimetry equipment. It was found that K showed an obvious catalytic activity on gasification, and decreased the steam gasification temperature for 100°C, and the saturated addition of K catalysts was about 10% for the Hohhot coal steam gasification. A homogeneous phase model, shrinking core model, and integrated model were applied to correlate the data of conversion with time and to estimate the reaction rate constants under different temperatures. The results of simulation showed that the integrated model was best suitable for the TR and the TD steam gasification process, and the shrinking core model was best suitable for the gasification processes of TR-10K and TD-10K. The integrated model was used for solving kinetics parameters of the TR and the TD steam gasification, and the shrinking core model was used for the TD-10K. It was found that the E is 55.06 kJ·mol−1 for the TD-10K, 132.19 kJ·mol−1 for the TR, and 144.38 kJ·mol−1 for the TD.
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Keywords: Hohhot coals; catalytic gasification; kinetics; model; thermo gravimetric-differential scanning calorimetry

Document Type: Research Article

Affiliations: Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai, China

Publication date: July 3, 2013

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