Volume 46 Issue 5
Oct.  2018
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YANG Hongmin, LIANG Longhui. Influence of CO2 on the replacement effect of CH4 in coal of different metamorphic grade under isobaric diffusion[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 55-59,65. DOI: 10.3969/j.issn.1001-1986.2018.05.009
Citation: YANG Hongmin, LIANG Longhui. Influence of CO2 on the replacement effect of CH4 in coal of different metamorphic grade under isobaric diffusion[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 55-59,65. DOI: 10.3969/j.issn.1001-1986.2018.05.009
shu

Influence of CO2 on the replacement effect of CH4 in coal of different metamorphic grade under isobaric diffusion

  • 1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;

  • 2. MOE Engineering Center of Mine Disaster Prevention and Rescue, Jiaozuo 454003, China

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National Natural Science Foundation of China((51174081)

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  • Received Date: October 27, 2017
  • Published Date: October 24, 2018
    Graphical Abstract
    • Abstract
  • To study the characteristics of CH4 replacement by CO2 under isobaric diffusion, samples of metamorphic coal, anthracite, lean coal and gas-fat coal were selected to carry out experiment of isobaric diffusion replacement under different isobaric diffusion pressure. Experimental results show that with the increase of coal metamorphism, the CH4 and CO2 adsorption capacity of coal is gradually enhanced, and the CO2 adsorption capacity of coal is greater than CH4; with the increase of diffusion pressure at the experimental point, the absolute volume and replacement rate of CO2 for CH4 increases, but the CH4 replacement ratio of CO2 injection decreases. In the range of the metamorphic degree of the experimental coal samples, the CH4 replacement rate is negatively correlated with the coal metamorphism degree and ratio of replacement to CO2 injection. The research results have guiding significance for the engineering technology and the theory of CH4 replacement by injecting CO2 into coal seam.
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    • References (19)
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