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Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

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  • Pengxiang Zhao

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China
    Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal Industry, Xi’an 710054, China
    Xinjiang Uygur Autonomous Region Coal Science Research Institute, Urumqi 830000, China)

  • Xingbao An

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Shugang Li

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China
    Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal Industry, Xi’an 710054, China)

  • Xinpeng Kang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yitong Huang

    (Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd., Changji 831100, China)

  • Junsheng Yang

    (Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd., Changji 831100, China)

  • Shikui Jin

    (Xinjiang Uygur Autonomous Region Coal Science Research Institute, Urumqi 830000, China
    Xinjiang Coal and CBM Engineering Technology Research Center, Urumqi 830000, China)

Abstract

To study the law of gas transportation in mining areas, Fluent numerical simulation software was applied to examine the influence of different pseudo-slope lengths (PSL) on gas concentration in a U-ventilated working area under no-extraction conditions. Based on this, numerical simulation experiments were conducted on the buried pipe extraction arrangement parameters. The simulation found that when there was no extraction, the PSL had an impact on the airflow in the extraction area, which caused the airflow in the extraction area to be disordered, causing gas to accumulate locally at the working area. When the buried pipe depths (BPDs) and PSLs of the working area worked together, the gas concentration of the working area was lower when the inlet air influence zone and the extraction influence zone were through; otherwise, gas concentration accumulation occurred at the working area. The research results showed that when the PSL was at 25 m and BPD was at 20 m, the gas concentration at the working area was not abnormal, and the gas concentration in the upper corner was lower. By adjusting the PSL and BPD of the test working area, the maximum gas concentration in the upper corner was reduced to 0.46% and the maximum gas concentration in the return air outlet was reduced to 0.41%. The experimental and practical results provide important reference values for coal and gas co-mining.

Suggested Citation

  • Pengxiang Zhao & Xingbao An & Shugang Li & Xinpeng Kang & Yitong Huang & Junsheng Yang & Shikui Jin, 2023. "Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf," Sustainability, MDPI, vol. 15(8), pages 1-24, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6628-:d:1123046
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    References listed on IDEAS

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    1. Xiong Ding & Cheng Zhai & Jizhao Xu & Xu Yu & Yong Sun, 2022. "Study on Coal Seepage Characteristics and Secondary Enhanced Gas Extraction Technology under Dual Stress Disturbance," Sustainability, MDPI, vol. 14(22), pages 1-18, November.
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    Cited by:

    1. Boris V. Malozyomov & Vladimir Ivanovich Golik & Vladimir Brigida & Vladislav V. Kukartsev & Yadviga A. Tynchenko & Andrey A. Boyko & Sergey V. Tynchenko, 2023. "Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors," Energies, MDPI, vol. 16(11), pages 1-16, May.
    2. Vladimir Brigida & Vladimir Ivanovich Golik & Elena V. Voitovich & Vladislav V. Kukartsev & Valeriy E. Gozbenko & Vladimir Yu. Konyukhov & Tatiana A. Oparina, 2024. "Technogenic Reservoirs Resources of Mine Methane When Implementing the Circular Waste Management Concept," Resources, MDPI, vol. 13(2), pages 1-14, February.

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