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On Gas Desorption-Diffusion Regularity of Bituminous Coal with Different Particle Sizes and Its Influence on Outburst-Coal Breaking

Author

Listed:
  • Jie Zheng

    (School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China)

  • Qinming Liang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
    School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Xin Zhang

    (School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China)

  • Jinyong Huang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
    School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Wei Yan

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
    School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Gun Huang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
    School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Honglin Liu

    (School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China)

Abstract

Coal and gas outburst is an urgent and constantly perplexing problem with coal resource extraction, threatening coal mine safe and sustainable production severely. Its mechanism and the participation of gas in coal breaking are still unclear. To explore this problem, in this paper, gas desorption-diffusion regularity of bituminous coal with different particle sizes and its influence on outburst-coal breaking were investigated through mercury intrusion porosimetry (MIP) tests, isothermal adsorption tests, and desorption-diffusion tests for coal particles with different sizes. The results indicated that the cumulative diffusion amount ( Q t ) and rate ( Q t / Q ∞ ), the effective diffusion coefficient ( D ′ ), and the kinetic diffusion parameter ( υ ) decreased as particle size increased. That meant gas was easier to desorb and diffuse from the smaller coal blocks, consequently making coal break into more tiny particles and accelerating gas desorption. As a result, a positive feedback effect that coal breaks continuously and gas releases rapidly and abundantly was formed in a short time when outbursts started, which caused gas release in quantities and promoted the occurrence of outbursts. The findings of this study enhance our understanding of the mechanism of gas participating in coal fragmentation during outbursts, which are significantly conducive to the prevention and control of coal mine disasters and sustainable production of coal resources.

Suggested Citation

  • Jie Zheng & Qinming Liang & Xin Zhang & Jinyong Huang & Wei Yan & Gun Huang & Honglin Liu, 2023. "On Gas Desorption-Diffusion Regularity of Bituminous Coal with Different Particle Sizes and Its Influence on Outburst-Coal Breaking," Sustainability, MDPI, vol. 15(13), pages 1-15, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:13:p:9894-:d:1176152
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    References listed on IDEAS

    as
    1. Zhenzhen Jia & Feng Tao & Qing Ye, 2023. "Experimental Research on Coal-Gas Outburst Prevention by Injection Liquid Freezing during Uncovering Coal Seam in Rock Crosscut," Sustainability, MDPI, vol. 15(3), pages 1-14, January.
    2. Liu, Ting & Lin, Baiquan & Fu, Xuehai & Gao, Yabin & Kong, Jia & Zhao, Yang & Song, Haoran, 2020. "Experimental study on gas diffusion dynamics in fractured coal: A better understanding of gas migration in in-situ coal seam," Energy, Elsevier, vol. 195(C).
    3. Feng Zhang & Jinshan Zhang, 2022. "Research on Joint Protection Layers and Gas Prevention Technology in Outburst Coal Seams," Sustainability, MDPI, vol. 14(14), pages 1-15, July.
    4. Dong Guowei & Zou Yinhui, 2017. "A Novel Method for Selecting Protective Seam against Coal and Gas Outburst: A Case Study of Wangjiazhai Coal Mine in China," Sustainability, MDPI, vol. 9(6), pages 1-15, June.
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