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Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

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  • Yi Zhang

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, China
    Xuzhou Anyun Mining Technology Inc., Xuzhou 221008, China)

  • Jun Xu

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

  • Deming Wang

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

Abstract

Inert gases can effectively inhibit coal spontaneous combustion. In this paper, the inhibition effect of inert gases (N 2 and CO 2 ) on coal spontaneous combustion was studied. In the low-temperature oxidation stage, the constant-temperature heat release and apparent activation energy of coal sample were measured and calculated by the C80 micro-calorimeter. In the high-temperature combustion stage, the critical temperature, maximum peak temperature, ignition temperature, and burn-out temperature of coal samples were analyzed by the synchronous thermal analyzer. The results demonstrate that with the decrease of O 2 concentration, the oxidation heat release of coal samples drops gradually while the apparent activation energy increases gradually. In the N 2 and CO 2 atmospheres, as the O 2 concentration is reduced to 1.5% and 3%, respectively, the value of apparent activation energy changes from negative to positive, and the spontaneous reaction transits to a nonspontaneous reaction. The TG-DTG (thermogravimetric-derivative thermogravimetric) curve of coal sample in the high-temperature combustion stage indicates that the critical temperature exhibits a W-shaped trend with the decrease of O 2 concentration, which also leads to gradual increases of maximum peak temperature, ignition temperature, and burn-out temperature. The above results signify that increasing the inert gas concentration can gradually reduce the oxidation and combustion rate and improve the inhibition effect on coal spontaneous combustion. In addition, when the O 2 concentration is the same, the inhibition effect of CO 2 on coal spontaneous combustion is superior to that of N 2 .

Suggested Citation

  • Yi Zhang & Jun Xu & Deming Wang, 2020. "Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion," Energies, MDPI, vol. 13(20), pages 1-14, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5256-:d:425685
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    References listed on IDEAS

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    1. Wolde-Rufael, Yemane, 2010. "Coal consumption and economic growth revisited," Applied Energy, Elsevier, vol. 87(1), pages 160-167, January.
    2. Li, He & Shi, Shiliang & Lin, Baiquan & Lu, Jiexin & Ye, Qing & Lu, Yi & Wang, Zheng & Hong, Yidu & Zhu, Xiangnan, 2019. "Effects of microwave-assisted pyrolysis on the microstructure of bituminous coals," Energy, Elsevier, vol. 187(C).
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    Cited by:

    1. He, Yongjun & Deng, Jun & Yi, Xin & Xiao, Yang & Deng, Yin & Chen, Weile, 2023. "Effect of rare-earth-containing inhibitors on the low-temperature oxidation characteristics and thermodynamic properties of coal," Energy, Elsevier, vol. 281(C).
    2. Gao, Fei & Bai, Qihui & Jia, Zhe & Zhang, Xun & Li, Yingdi, 2024. "Influence and inerting mechanism of inert gas atmospheres on the characteristics of oxidative spontaneous combustion in coal," Energy, Elsevier, vol. 293(C).
    3. Liu, Wei & Zhang, Fengjie & Gao, Tiegang & Chu, Xiangyu & Qin, Yueping, 2023. "Efficient prevention of coal spontaneous combustion using cooling nitrogen injection in a longwall gob: An application case," Energy, Elsevier, vol. 281(C).

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