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Spontaneous combustion and oxidation kinetic characteristics of alkaline-water-immersed coal

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  • Li, Purui
  • Yang, Yongliang
  • Zhao, Xiaohao
  • Li, Jinhu
  • Yang, Jingjing
  • Zhang, Yifan
  • Yan, Qi
  • Shen, Chang

Abstract

Most scholars used distilled-water-immersed coal to study the reasons why water-immersed coal was prone to self-ignition, while mine water in field was mostly alkaline. Thus, the influence of the alkalinity of mine water on the self-ignition properties of water-immersed coal was explored. Experimental results showed that during the low-temperature oxidation process, the CO productions of DL, ZX, XT alkaline-water-immersed coals were higher than that of raw coals when the temperature was increased to 392, 382, 370 K respectively. Compared with raw coals, the average apparent-activation-energies (Ea) of the distilled-water-immersed DL, ZX, XT coals decreased by 6.89%, 5.94%, 7.75%, respectively. Moreover, that of the alkaline-water-immersed coals decreased by 15.83%, 11.76%, 16.64%, respectively. The reduction in the average apparent Ea of the alkaline-water-immersed coal was approximately twice that of the distilled-water-immersed coal. Further investigation revealed that the content of oxygen-containing functional groups in alkaline-water-immersed coals were obviously more than those of the distilled-water-immersed coal. Therefore, the self-ignition ability of the alkaline-water-immersed coal was greater than distilled-water-immersed coal. Compared with the single soaking effect of pure water on coal, many physicochemical variations produced by the reactions of alkali ions with coal may be the main reason for the self-ignition of water-immersed coal.

Suggested Citation

  • Li, Purui & Yang, Yongliang & Zhao, Xiaohao & Li, Jinhu & Yang, Jingjing & Zhang, Yifan & Yan, Qi & Shen, Chang, 2023. "Spontaneous combustion and oxidation kinetic characteristics of alkaline-water-immersed coal," Energy, Elsevier, vol. 263(PE).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pe:s0360544222029784
    DOI: 10.1016/j.energy.2022.126092
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    References listed on IDEAS

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    1. Kong, Biao & Wang, Enyuan & Lu, Wei & Li, Zenghua, 2019. "Application of electromagnetic radiation detection in high-temperature anomalous areas experiencing coalfield fires," Energy, Elsevier, vol. 189(C).
    2. Peng, Gongzhuang & Wang, Hongwei & Song, Xiao & Zhang, Heming, 2017. "Intelligent management of coal stockpiles using improved grey spontaneous combustion forecasting models," Energy, Elsevier, vol. 132(C), pages 269-279.
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    1. Jiang, Bingyou & Yu, Chang-Fei & Yuan, Liang & Lu, Kunlun & Tao, Wenhan & Lin, Hanyi & Zhou, Yu, 2023. "Investigation on oxidative pyrolysis characteristics of bituminous coal through thermal analysis and density functional theory," Applied Energy, Elsevier, vol. 349(C).
    2. Pan, Rongkun & Hu, Daimin & Han, Xuefeng & Chao, Jiangkun & Jia, Hailin, 2023. "Analysis of the wetting and exothermic properties of preoxidized coal and the microscopic mechanism," Energy, Elsevier, vol. 271(C).
    3. Liu, Qiqi & Sun, Lulu & Zhang, Yanbo & Liu, Zhenyi & Ma, Jiayu, 2023. "Effects of water immersion and pre-oxidation on re-ignition characteristics of non-caking coal," Energy, Elsevier, vol. 282(C).
    4. Gao, Kaiyang & Yang, Yongliang & Yan, Qi & Li, Purui & Zhang, Yifan & Wang, Guoqin, 2024. "Preparation and study of a sodium alginate film for preventing spontaneous combustion of water-soaked coal in goaf," Energy, Elsevier, vol. 289(C).

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