Analysis of CH<sub>4</sub> evolution in fast pyrolysis of lignite under H<sub>2</sub> atmosphere

GAO Song-ping; WANG Jian-fei; ZHAO Jian-tao; WANG Zhi-qing; FANG Yi-tian; HUANG Jie-jie

Volume 43 Issue 05

May 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(05): 537-545

GAO Song-ping, WANG Jian-fei, ZHAO Jian-tao, WANG Zhi-qing, FANG Yi-tian, HUANG Jie-jie. Analysis of CH4 evolution in fast pyrolysis of lignite under H2 atmosphere[J]. Journal of Fuel Chemistry and Technology, 2015, 43(05): 537-545.

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GAO Song-ping, WANG Jian-fei, ZHAO Jian-tao, WANG Zhi-qing, FANG Yi-tian, HUANG Jie-jie. Analysis of CH₄ evolution in fast pyrolysis of lignite under H₂ atmosphere[J]. Journal of Fuel Chemistry and Technology, 2015, 43(05): 537-545.

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Analysis of CH₄ evolution in fast pyrolysis of lignite under H₂ atmosphere

1.
Taiyuan Institute of Technology, Taiyuan 030008, China;
2.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2014-07-06
Publish Date: 2015-05-30

Abstract

Abstract

The fast hydropyrolysis of Huolinhe lignite were carried out under pressure in a tubular reactor with a transporter for coal samples. The effect of H₂ on CH₄ evolution and crack of chemical bonds were analyzed. Under pressure fast hydropyrolysis conditions, CH₄ yield was higher under H₂ atmosphere than that under N₂ atmosphere, and increased with increasing temperature and pressure. Compared with N₂ atmosphere, the yield of CH₄ increased by 72.5% under 50% H₂ atmosphere at 900 ℃ and 1.0 MPa. H₂ or H· free radical induced the cracks of aromatic rings, side chains, ether linkages and aliphatic chains in the char, which could promote the coal pyrolysis. The increased yield of CH₄ was mainly due to the external donor H. Below 700 ℃, the action of H₂ with active groups in coal structure affected the pyrolysis of coal; above 700 ℃, hydrogenation of char promoted coal pyrolysis, leading to an increase in CH₄ yield.
- H₂ atmosphere,
- in fast pyrolysis under pressure,
- the CH₄ evolution,
- the crack of the chemical bonds

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References(26)

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