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Study on coal bed gas displacement by flue gas in coal-fired power plants under different gas injection factors
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Gang BAI1, 2, Xuepeng WANG1, 2, Jun SU1, 2, Zhengdong LIU3, Jinyu LI1, Chaojun FAN4
China Safety Science Journal | 2025, 35(11) : 65 - 71
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China Safety Science Journal | 2025, 35(11): 65-71
• Safety engineering technology •
Study on coal bed gas displacement by flue gas in coal-fired power plants under different gas injection factors
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Gang BAI1, 2, Xuepeng WANG1, 2, Jun SU1, 2, Zhengdong LIU3, Jinyu LI1, Chaojun FAN4
Affiliations
  • 1College of Safety Science & Engineering, Liaoning Technical University, Huludao Liaoning 125000, China
  • 2Key Laboratory of Mine Thermodynamic Disasters & Control of Ministry of Education, Liaoning Technical University, Huludao Liaoning 125000, China
  • 3School of Resources and Civil Engineering, Northeastern University, Shenyang Liaoning 110819, China
  • 4College of Mining, Liaoning Technical University, Fuxin Liaoning 123000, China
Published: 2025-11-28 doi: 10.16265/j.cnki.issn1003-3033.2025.11.2963
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In order to improve the efficiency of gas extraction, numerical simulation methods were employed to analyze the characteristics of changes in gas volume fraction, gas breakthrough time, coal permeability, CH4 extraction rate, and extraction quantity under different gas injection pressures. The results show that after flue gas injection, the volume fraction of CH4 shows a downward trend, while the volume fractions of CO2, N2 and O2 show an upward trend. The increase in injection pressure will shorten the breakthrough time of each gas in the flue gas, reduce the permeability of the coal seam and increase the gas extraction volume. At 180 days of extraction, the gas injection pressure increased from 0.5 MPa to 2.5 MPa, the coal seam permeability decreased from 8.722 7×10-17 m2 to 8.711 5×10-17 m2, and the extraction volume increased from 449.01 m3 to 715.30 m3. The gas drainage rate shows the variation characteristics of rising - falling - rising - falling. From the perspective of the influence of gas injection pressure on drainage, the gas injection pressure has a relatively small impact on the drainage in the first two stages.

injection pressure  /  power plant flue gas  /  CH4 extraction  /  coalbed methane  /  gas pressure  /  gas drainage volume
Gang BAI, Xuepeng WANG, Jun SU, Zhengdong LIU, Jinyu LI, Chaojun FAN. Study on coal bed gas displacement by flue gas in coal-fired power plants under different gas injection factors[J]. China Safety Science Journal, 2025 , 35 (11) : 65 -71 . DOI: 10.16265/j.cnki.issn1003-3033.2025.11.2963
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Year 2025 volume 35 Issue 11
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2025.11.2963
  • Receive Date：2025-06-10
  • Online Date：2026-07-09
  • Published：2025-11-28
Article Data
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History
  • Received：2025-06-10
  • Revised：2025-09-15
Funding
Affiliations
    1College of Safety Science & Engineering, Liaoning Technical University, Huludao Liaoning 125000, China
    2Key Laboratory of Mine Thermodynamic Disasters & Control of Ministry of Education, Liaoning Technical University, Huludao Liaoning 125000, China
    3School of Resources and Civil Engineering, Northeastern University, Shenyang Liaoning 110819, China
    4College of Mining, Liaoning Technical University, Fuxin Liaoning 123000, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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