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Study of the Oxidation Characteristics and CO Production Mechanism of Low-Rank Coal Goaf

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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

Affected by an insufficient understanding of oxidation characteristics and the CO production mechanism in low-rank coal goaf, the safety management of coal spontaneous combustion (CSC) faces severe challenges. In this study, in-depth research was conducted using ambient temperature oxidation (ATO), temperature-programmed, in situ FTIR experiments and DFT simulation after analyzing the oxidation scenario characteristics of low-metamorphic coal goaf. The results show the oxidation of low-rank coal goaf includes two processes of ATO in the dissipation zone and CSC in the oxidation zone. The CO production of ATO increases with a decrease in coal metamorphic degree, and the risk of CSC is influenced by ATO, with an inhibitory effect before the critical temperature, and an encouraging effect after that. The CO production mechanism of low metamorphic coal goaf from ATO to CSC is established. Before the critical temperature, CO mainly comes from the primary aldehyde functional groups, then peroxide-free radicals participate in the reaction, resulting in the production of a large number of secondary aldehyde functional groups, which leads to the sudden change in CO output. The problem of the abnormal, continuous exceedance of CO in the tailgate corner can be solved by developing an ATO inhibitor, which plays an inhibiting role at ambient temperature and decomposes in the event of CSC.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3311-:d:1118351
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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. Zhang, Yanni & Shu, Pan & Deng, Jun & Duan, Zhengxiao & Li, Lele & Zhang, Lulu, 2022. "Analysis of oxidation pathways for characteristic groups in coal spontaneous combustion," Energy, Elsevier, vol. 254(PA).
    3. Li, Lei & Ren, Ting & Zhong, Xiaoxing & Wang, Jiantao, 2022. "Study of ambient temperature oxidation in low metamorphic coal and the oxidation mechanism," Energy, Elsevier, vol. 252(C).
    4. 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.
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