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Study of the Abnormal CO-Exceedance Phenomenon in the Tailgate Corner of a Low Metamorphic Coal Seam

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  • Lei Li

    (Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
    School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Ting Ren

    (Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
    School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China
    School of Civil, Mining & Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia)

  • Xiaoxing Zhong

    (Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
    School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Jiantao Wang

    (Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
    School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China)

Abstract

Given the difficulty of early warning of coal spontaneous combustion caused by continuous abnormal exceedance of CO in the tailgate corner of a low metamorphic coal seam and taking the 1305-working face of the Dananhu No.1 coal mine in Hami, Xinjiang as an example, this paper studies the abnormal CO-exceedance phenomenon based on field measurements, experimental research, and numerical simulation. The research shows that the abnormal CO-exceedance phenomenon is not caused by spontaneous combustion oxidation but by ambient-temperature oxidation of coal in the goaf. Factors, such as higher amounts of residual coal and higher degrees of fragmentation of the goaf, provide opportunities for the ambient-temperature oxidation of residual coal in the 1305 goaf. The 1305 coal oxidation characteristics at ambient temperature are examined, and the abnormal CO-exceedance mechanism is analyzed in depth. A CO-early-warning-limit model in the tailgate corner for coal spontaneous combustion in the 1305 goaf is established, and the scientific problems needing to be solved by further research are also discussed. The relevant research results have an important guiding significance for improving scholars’ understandings of CO exceedance in similar low metamorphic coal seams and the early warning of coal spontaneous combustion.

Suggested Citation

  • Lei Li & Ting Ren & Xiaoxing Zhong & Jiantao Wang, 2022. "Study of the Abnormal CO-Exceedance Phenomenon in the Tailgate Corner of a Low Metamorphic Coal Seam," Energies, MDPI, vol. 15(15), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5380-:d:871225
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    References listed on IDEAS

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    1. Shuo Liu & Yuguo Wu & Chunshan Zhou & Jianming Wu & Yulong Zhang, 2020. "Study on the CO Formation Mechanism during Coal Ambient Temperature Oxidation," Energies, MDPI, vol. 13(10), pages 1-11, May.
    2. Li, Jinhu & Li, Zenghua & Yang, Yongliang & Duan, Yujian & Xu, Jun & Gao, Ruiting, 2019. "Examination of CO, CO2 and active sites formation during isothermal pyrolysis of coal at low temperatures," Energy, Elsevier, vol. 185(C), pages 28-38.
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    1. Lei Li & Ting Ren & Xiaoxing Zhong & Jiantao Wang, 2023. "Study of the Oxidation Characteristics and CO Production Mechanism of Low-Rank Coal Goaf," Energies, MDPI, vol. 16(8), pages 1-16, April.

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