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Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action

Author

Listed:
  • Yuguo Wu

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China)

  • Yulong Zhang

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China)

  • Jie Wang

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiaoyu Zhang

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Junfeng Wang

    (Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China)

  • Chunshan Zhou

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China)

Abstract

It is imperative to have an in-depth understanding of the effect of extraneous moisture on the spontaneous combustion of coal not only for the control and prevention of coal spontaneous combustion in the coal mining industry, but also for the optimization design and application of the technological process. In this study, the type of moisture in a coal body has been redefined for the first time from the perspective of disaster prevention and control, i.e., original occurrence of moisture in the coal matrix and the extraneous moisture from the technological process. A suit of coal bodies with different extraneous moisture was prepared by soaking long-flame coal with a low water content. Using a temperature-programmed oxidation test, the effects of extraneous moisture on the temperature increase rate of coal bodies and the emission characteristics of gaseous products during coal spontaneous combustion were studied. Moreover, combined with the characterization of thermal analysis and of pore structure test, the action the mechanism of extraneous moisture on the coal spontaneous combustion process was also explored. The experimental results indicated that the effect of the extraneous moisture content varied with the development of coal spontaneous combustion. In the slow oxidation stage, extraneous moisture played a physical inhibition role in the coal oxidation. In the accelerated oxidation stage, extraneous moisture exhibited a catalytic effect on the coal–oxygen reaction or directly participated in the reaction. After entering the rapid oxidation stage, a delayed effect appeared. When the coal temperature exceeded 180 °C, the spontaneous combustion characteristics of coals with different initial moisture contents gradually tended to achieved balance.

Suggested Citation

  • Yuguo Wu & Yulong Zhang & Jie Wang & Xiaoyu Zhang & Junfeng Wang & Chunshan Zhou, 2020. "Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action," Energies, MDPI, vol. 13(8), pages 1-17, April.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:1969-:d:346262
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    References listed on IDEAS

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    1. Gang Wang & Yue Wang & Lulu Sun & Xiang Song & Qiqi Liu & Hao Xu & Wenzhou Du, 2018. "Study on the Low-Temperature Oxidation Law in the Co-Mining Face of Coal and Oil Shale in a Goaf—A Case Study in the Liangjia Coal Mine, China," Energies, MDPI, vol. 11(1), pages 1-16, January.
    2. Jiuyuan Fan & Gang Wang & Jiuling Zhang, 2019. "Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC," Energies, MDPI, vol. 12(20), pages 1-18, October.
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    Cited by:

    1. Florencio Fernández-Alaiz & Ana Maria Castañón & Fernando Gómez-Fernández & Antonio Bernardo-Sánchez & Marc Bascompta, 2020. "Determination and Fire Analysis of Gob Characteristics Using CFD," Energies, MDPI, vol. 13(20), pages 1-11, October.
    2. Li, Min & Yang, Xueqin & Lu, Yi & Wang, Deming & Shi, Shiliang & Ye, Qing & Li, He & Wang, Zheng, 2023. "Thermodynamic variation law and influence mechanism of low-temperature oxidation of lignite samples with different moisture contents," Energy, Elsevier, vol. 262(PB).
    3. Florencio Fernánez-Alaiz & Ana Maria Castañón & Fernando Gómez-Fernández & Antonio Bernardo-Sánchez & Marc Bascompta, 2020. "Analysis of the Fire Propagation in a Sublevel Coal Mine," Energies, MDPI, vol. 13(14), pages 1-16, July.
    4. Hua Wang & Wei Zhang & Haihui Xin & Deming Wang & Cuicui Di & Lu Liu, 2021. "Characteristics of Pyrolysis and Low Oxygen Combustion of Long Flame Coal and Reburning of Residues," Energies, MDPI, vol. 14(10), pages 1-17, May.

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