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Received August 6, 2010
Accepted November 15, 2010
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Correlation of H2S and COS in the hot coal gas stream and its importance for high temperature desulfurization
1School of Energy and Power Engineering, Shenyang Aerospace University, Shenyang 110036, China 2Key Laboratory Advanced Coal and Coking Technology, Liaoning Province, School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China 3Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P.R. China
Korean Journal of Chemical Engineering, April 2011, 28(4), 1054-1057(4), 10.1007/s11814-010-0482-2
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Abstract
Thermodynamic analysis of the correlation of H2S and COS has been carried out at the temperature range of 400-650 oC at which high temperature desulfurization of coal gas is usually performed. The correlation of the two sulfur species is mainly through the reaction H2S+CO→COS+H2. Simulated coal gas with the following composition CO 32.69%, H2 39.58%, CO2 18.27%, N2 8.92% and H2S 0.47% was used in this study, and the equilibrium concentrations of the two species at different temperatures were calculated. The results of Fe-based sorbents during sulfidation were compared with calculations. It is concluded that the above reaction may reach equilibrium concentration in the presence of the Fe-based sorbents, which means the Fe-based sorbents may effectively catalyze the reaction between H2S and CO. Because of the correlation of the two sulfur species, both can be effectively removed at high temperatures simultaneously, offering high temperature desulfurization some advantages over low temperature desulfurization processes.
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References
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Al-Ghawas HA, Sandall OC, Chem. Eng. Sci., 46(2), 665 (1991)
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