Investigation into Syngas Generation from Solid Fuel Using CaSO4-based Chemical Looping Gasification Process

doi:10.1016/S1004-9541(13)60450-4

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (2): 127-134.DOI: 10.1016/S1004-9541(13)60450-4

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Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process

LIU Yongzhuo, GUO Qingjie

College of Chemical Engineering, Qingdao University of Science & Technology, Key Laboratory of Clean Chemical Processing Engineering of Shandong Province, Qingdao 266042, China

Received:2011-12-12 Revised:2012-05-07 Online:2013-03-13 Published:2013-02-28

Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process

刘永卓, 郭庆杰

College of Chemical Engineering, Qingdao University of Science & Technology, Key Laboratory of Clean Chemical Processing Engineering of Shandong Province, Qingdao 266042, China

通讯作者: GUO Qingjie
基金资助:
Supported by the National Natural Science Foundation of China (20876079), the Natural Science Funds for Distinguished Young Scholar in Shandong Province (JQ200904), and Shandong Province Key Technologies Research and Development Program of China (2008GG10006010, 2009GG10007001).

Abstract

Abstract: Chemical-looping gasification (CLG) is a novel process for syngas generation from solid fuels, sharing the same basic principles as chemical-looping combustion (CLC). It also uses oxygen carriers (mainly metal oxide and calcium sulfate) to transfer heat and oxygen to the fuel. In this paper, the primary investigation into the CLG process with CaSO₄ as oxygen carrier was carried out by thermodynamic analysis and experiments in the tube reactor. Sulfur-contained gas emission was mainly H₂S rather than SO₂ in the CLG process, showing some different features from the CLC. The mass and heat balance of CLG processes were calculated thermodynamically to determinate the auto-thermal operating conditions with different CaSO₄/C and steam/C molar ratios. It was found that the CaSO₄/C molar ratio should be higher than 0.2 to reach auto-thermal balance. The effect of temperature on the reactions between oxygen carrier and coal was investigated based on Gibbs free energy minimum method and experimental results. It indicated that high temperature favored the CLG process in the fuel reactor and part of syngas was consumed to compensate for auto-thermal system.

Key words: chemical-looping gasification, syngas generation, CaSO₄ oxygen carrier, thermodynamic analysis

摘要： Chemical-looping gasification (CLG) is a novel process for syngas generation from solid fuels, sharing the same basic principles as chemical-looping combustion (CLC). It also uses oxygen carriers (mainly metal oxide and calcium sulfate) to transfer heat and oxygen to the fuel. In this paper, the primary investigation into the CLG process with CaSO₄ as oxygen carrier was carried out by thermodynamic analysis and experiments in the tube reactor. Sulfur-contained gas emission was mainly H₂S rather than SO₂ in the CLG process, showing some different features from the CLC. The mass and heat balance of CLG processes were calculated thermodynamically to determinate the auto-thermal operating conditions with different CaSO₄/C and steam/C molar ratios. It was found that the CaSO₄/C molar ratio should be higher than 0.2 to reach auto-thermal balance. The effect of temperature on the reactions between oxygen carrier and coal was investigated based on Gibbs free energy minimum method and experimental results. It indicated that high temperature favored the CLG process in the fuel reactor and part of syngas was consumed to compensate for auto-thermal system.

关键词: chemical-looping gasification, syngas generation, CaSO₄ oxygen carrier, thermodynamic analysis

LIU Yongzhuo, GUO Qingjie. Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process[J]. Chin.J.Chem.Eng., 2013, 21(2): 127-134.

刘永卓, 郭庆杰. Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process[J]. Chinese Journal of Chemical Engineering, 2013, 21(2): 127-134.

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Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process

Investigation into Syngas Generation from Solid Fuel Using CaSO₄-based Chemical Looping Gasification Process

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