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Optimization of a Marker Gas for Analyzing and Predicting the Spontaneous Combustion Period of Coking Coal

Author

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  • Peizhong Lu

    (State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan 467000, China
    Kaifeng Pingmei New Carbon Materials Technology Co., Ltd., Kaifeng 475002, China)

  • Yuxuan Huang

    (Industrial Science Institute, Wuhan University, Wuhan 430072, China)

  • Peng Jin

    (State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan 467000, China)

  • Shouguo Yang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Man Wang

    (State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan 467000, China)

  • Xiaochuan Wang

    (Industrial Science Institute, Wuhan University, Wuhan 430072, China)

Abstract

The adequate assessment of the spontaneous combustion and oxidation characteristics of coking coal can help to reduce its spontaneous combustion potential. In this study, the natural ignition period of the Hex coking coal seam at Ping Coal was calculated based on the programmed-temperature-rise test and the thermal property parameters measured during the spontaneous combustion of the coal. Typical gas concentrations were measured at different oxygen concentrations and coal particle sizes to investigate the changes in the oxygen, carbon–oxygen, and hydrocarbon gas concentrations during the low-temperature oxidation of the coking coal and to determine the indicator gases at different oxidation stages. The following results were obtained: The minimum critical oxygen concentration required for spontaneous ignition was 8%, and fire prevention measures should be implemented below 200 °C. When the temperature of the coal sample reaches 50–60 °C, the rates of CO and CO 2 production increase, and when the temperature of the coal sample reaches 100–120 °C, the spontaneous combustion and oxidation of the coal generates alkane gas, in which the coal particle size has a negligible effect on the concentration of each generated gas. CO and C 2 H 4 were selected as the indicator gases for different coking coal oxidation stages, and C 2 H 6 and the C 2 H 4 /C 2 H 6 ratio were used as secondary indicators to assist in the analysis. Utilizing the enhanced mathematical model for the shortest spontaneous combustion period of coal seams, in conjunction with a programmed-temperature test device, experimental calculations were conducted to determine the adiabatic spontaneous combustion period. The results indicate that the natural ignition period for the Hex coking coal seam at Ping Coal is approximately 60 days, representing a brief timeframe, and the coal seam is characterized by a high risk of spontaneous combustion.

Suggested Citation

  • Peizhong Lu & Yuxuan Huang & Peng Jin & Shouguo Yang & Man Wang & Xiaochuan Wang, 2023. "Optimization of a Marker Gas for Analyzing and Predicting the Spontaneous Combustion Period of Coking Coal," Energies, MDPI, vol. 16(23), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:23:p:7802-:d:1288689
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    References listed on IDEAS

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    1. Xu, Jiuping & Gao, Wen & Xie, Heping & Dai, Jingqi & Lv, Chengwei & Li, Meihui, 2018. "Integrated tech-paradigm based innovative approach towards ecological coal mining," Energy, Elsevier, vol. 151(C), pages 297-308.
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