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Characteristics of Airflow Reversal of Excavation Roadway after a Coal and Gas Outburst Accident

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  • Junhong Si

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

  • Lin Li

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

  • Jianwei Cheng

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221008, China)

  • Yiqiao Wang

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

  • Wei Hu

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

  • Tan Li

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

  • Zequan Li

    (School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China)

Abstract

Determining the influence scope of the airflow disorder is an important problem after coal and gas outburst accidents in ventilation systems. This paper puts forward the indexes of airflow disorder, including the length of the excavation roadway, the outburst pressure, the pressure difference of the air door, and the air quantity of the auxiliary fan. Using the orthogonal table of L 9 (3 4 ) and numerical simulation method, the characteristics of airflow reversal are studied, and the outburst airflow reversal degree is calculated should the ventilation facility fail. Furthermore, on the basis of fuzzy comprehensive optimization theory, the comprehensive evaluation model of the airflow disorder is established. The results show that the length of the excavation roadway is the most important factor affecting the stability of the ventilation system, followed by the outburst pressure, pressure difference of the air door, and air quantity of the auxiliary fan. The influence of a gas outburst accident on the return air system is greater than that on the inlet air system, and a larger air velocity has a greater impact on the ventilation system, especially the air inlet part. Moreover, the airflow reversal degree of the ventilation system increases with the increase of the outburst pressure or decreases with the length of the excavation roadway. This paper provides a basis for the prevention of gas outburst accidents.

Suggested Citation

  • Junhong Si & Lin Li & Jianwei Cheng & Yiqiao Wang & Wei Hu & Tan Li & Zequan Li, 2021. "Characteristics of Airflow Reversal of Excavation Roadway after a Coal and Gas Outburst Accident," Energies, MDPI, vol. 14(12), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3645-:d:577711
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    References listed on IDEAS

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    1. Cheng Zhai & Xianwei Xiang & Jizhao Xu & Shiliang Wu, 2016. "The characteristics and main influencing factors affecting coal and gas outbursts in Chinese Pingdingshan mining region," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 82(1), pages 507-530, May.
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    Cited by:

    1. Junqi Zhu & Haotian Zheng & Li Yang & Shanshan Li & Liyan Sun & Jichao Geng, 2023. "Evaluation of deep coal and gas outburst based on RS-GA-BP," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 115(3), pages 2531-2551, February.

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