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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(9): 1033-1039. shu

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

  • 1.

    1. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

  • Corresponding author: HUANG Jie-jie, 
  • Received Date: 3 March 2014
    Available Online: 27 April 2014

    Fund Project: 中国科学院战略性先导科技专项(XDA07050100)。 (XDA07050100)

  • 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.
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