Effect of H<sub>2</sub> on coal-char gasification reaction with steam under pressure

YAN Qi-xuan; WANG Jian-fei; HUANG Jie-jie; ZHAO Jian-tao; FANG Yi-tian

Volume 42 Issue 09

Sep. 2014

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Article Navigation > Journal of Fuel Chemistry and Technology > 2014 > 42(09): 1033-1039

YAN Qi-xuan, WANG Jian-fei, HUANG Jie-jie, ZHAO Jian-tao, FANG Yi-tian. Effect of H2 on coal-char gasification reaction with steam under pressure[J]. Journal of Fuel Chemistry and Technology, 2014, 42(09): 1033-1039.

Citation:

YAN Qi-xuan, WANG Jian-fei, HUANG Jie-jie, ZHAO Jian-tao, FANG Yi-tian. Effect of H₂ on coal-char gasification reaction with steam under pressure[J]. Journal of Fuel Chemistry and Technology, 2014, 42(09): 1033-1039.

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Effect of H₂ on coal-char gasification reaction with steam under pressure

1.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry Chinese Academy of Sciences, Taiyuan 030001, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2014-03-03
Rev Recd Date: 2014-04-27
Publish Date: 2014-09-30

Abstract

Abstract

The gasification characteristics of Huolinhe lignite char (HLH char), SM bituminous coal char (SM char) and Jincheng anthracite char (JC char) with the mixtures of steam and H₂ at elevated pressures were investigated in a pressurized fixed bed differential (PFBD) reactor. The results show that the inhibition of H₂ on the coal-char gasification with steam is remarkable, and the intensity of the inhibition increases with increasing H₂ partial pressure, total pressure and coal rank, respectively; while it decreases with increasing temperature. Coal-char gasification with steam or steam/H₂ can be described by the same kinetic model, and the final carbon conversion of coal-char gasification with steam/H₂ is lower than that with steam. The inhibition mechanism is related to the H₂ partial pressure. When H₂ partial pressure is low, H atom dissociated from H₂ molecule occupies the active point on the coal-char surface directly; while when the H₂ partial pressure is high, the irreversible reaction of oxygen-exchange reaction is strengthened.
- coal gasification,
- inhibition,
- elevated pressure,
- the mixtures of steam and H₂

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References

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