Correlation of H2S and COS in the hot coal gas stream and its importance for high temperature desulfurization
Thermodynamic analysis of the correlation of H2S and COS has been carried out at the temperature range of 400–650 °C 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.
Key wordsHot Coal Gas Cleaning Desulfurization COS Formation Coal-gasification-based Poly-generation
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- 5.J. E. Oakey, N. J. Simms and W. Peng, The development of hot gas desulfurization systems for gasification combined cycle power generation, D.P.U. 00/761, Editor, DOE Report, 29 (2000).Google Scholar
- 7.J. Winnick and M. Liu, High temperature removal of H 2 S from coal gasification process streams using an electrochemical membrane system, DOE Award Number: DE-FG26-99FT40586, 120 (2003).Google Scholar
- 9.K. Karan, A. K. Mehrotra and L. A. Behie, Chem. Eng. Sci., 54(15–16), 2999 (1999).Google Scholar
- 13.D. Wang, Study of the sulfidation properties of Fe-Mo sorbent supported on coal ash for hot coal gas desulfurization, in Key laboratory of coal chemistry, Taiyuan University of Technology. Taiyuan, China, 112 (2009).Google Scholar
- 14.J. Hepola, Sulfur transformations in catalytic hot-gas cleaning of gasification gas, in Department of Chemical Technology, Helsinki University of Technology. Espoo, Finland, 58 (2000).Google Scholar
- 19.J. Yu, F.-J. Tian, L. J. McKenzie and C.-Z. Li, EFCE (Part B) and IChemE, 84(B2), 125 (2006).Google Scholar
- 20.F. Bustamante, R. M. Enick, A. Cugini, R. Killmeyer, B. H. Howard, K. S. Rothenberger, M. Ciocco, B. Morreale, S. Chattopadhyay and S. Shi, Kinetics of the homogeneous reverse water-gas shift reaction at high temperature, in 03Aug AIChEJ RWGS, DOE Report, 58 (2003).Google Scholar
- 21.W. Xie, Study of the sulfidation properties of Fe-Ce sorbent supported on coal ash for hot coal gas desulfurization, in Key laboratory of coal chemistry, Taiyuan University of Technology, Taiyuan, China, 82 (2007).Google Scholar