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Inhibiting effects of 1-butyl-3-methyl imidazole tetrafluoroborate on coal spontaneous combustion under different oxygen concentrations

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  • Lü, Hui-Fei
  • Xiao, Yang
  • Deng, Jun
  • Li, Da-jiang
  • Yin, Lan
  • Shu, Chi-Min

Abstract

Exothermicity is a key parameter for evaluating coal spontaneous combustion (CSC). A suitable oxygen concentration is essential for CSC. Ionic liquids (ILs), which are a popular type of fire prevention material, inhibit coal oxidation. 1-Butyl-3-methyl imidazole tetrafluoroborate ([BMIM][BF4]) was used at various mass ratios (0, 2, 5, and 10 mass%) to treat coal to inhibit CSC. Through simultaneous thermal analysis tests, coal samples were investigated in atmospheres with oxygen concentrations of 5, 10, 15, and 21 vol%. The results indicated that the mass loss decreased with increasing IL content. However, the mass loss did not decrease indefinitely with increasing IL content. The lowest mass loss was observed at an IL concentration of approximately 7.5 mass%. The inhibition increased with decreasing oxygen concentrations. Moreover, the inhibiting effect first increased slowly until the IL concentration exceeded 10 mass%, after which the inhibiting effect increased rapidly. The relationship between the exothermic rate and the mass loss rate of the coal at Stage 2 of the reaction was comparatively analysed. The reaction rate between oxygen and coal was the key factor influencing the exothermic rate. In the oxidation of coal, both the oxygen concentration and inhibitor content affected the comprehensive combustion index of coal.

Suggested Citation

  • Lü, Hui-Fei & Xiao, Yang & Deng, Jun & Li, Da-jiang & Yin, Lan & Shu, Chi-Min, 2019. "Inhibiting effects of 1-butyl-3-methyl imidazole tetrafluoroborate on coal spontaneous combustion under different oxygen concentrations," Energy, Elsevier, vol. 186(C).
    • Handle: RePEc:eee:energy:v:186:y:2019:i:c:s0360544219315853
    DOI: 10.1016/j.energy.2019.115907
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    1. Xue, Di & Hu, Xiangming & Cheng, Weimin & Yu, Xiaoxiao & Wu, Mingyue & Zhao, Yanyun & Lu, Yi & Pan, Rongkun & Niu, Huiyong & Hu, Shengyong, 2020. "Development of a novel composite inhibitor modified with proanthocyanidins and mixed with ammonium polyphosphate," Energy, Elsevier, vol. 213(C).
    2. Song, Jiajia & Deng, Jun & Zhao, Jingyu & Zhang, Yanni & Wang, Caiping & Shu, Chi-Min, 2021. "Critical particle size analysis of gas emission under high-temperature oxidation of weathered coal," Energy, Elsevier, vol. 214(C).
    3. Lü, Hui-Fei & Deng, Jun & Li, Da-Jiang & Xu, Fan & Xiao, Yang & Shu, Chi-Min, 2021. "Effect of oxidation temperature and oxygen concentration on macro characteristics of pre-oxidised coal spontaneous combustion process," Energy, Elsevier, vol. 227(C).
    4. Lu, Wei & Gao, Ao & Liang, Yuntao & He, Zhenglong & Li, Jinliang & Sun, Yong & Song, Shuanglin & Meng, Shaocong, 2023. "Stable and highly efficient HMDS terminated m-Cresol inhibitor for inhibiting coal spontaneous combustion," Energy, Elsevier, vol. 282(C).
    5. Pan, Rongkun & Li, Cong & Chao, Jiangkun & Hu, Daimin & Jia, Hailin, 2023. "Thermal properties and microstructural evolution of coal spontaneous combustion," Energy, Elsevier, vol. 262(PA).
    6. Wang, Hui & Xie, Jingna & Xie, Jun & Jiang, Hehe & Wen, Yongzan & Huang, Wanpeng & Wang, Gang & Jiang, Bingyou & Zhang, Chao, 2022. "Effect of critical micelle concentration of imidazole ionic liquids in aqueous solutions on the wettability of anthracite," Energy, Elsevier, vol. 239(PB).
    7. Jiaqi Hu & Rui Huang & Fangting Xu, 2022. "Data Mining in Coal-Mine Gas Explosion Accidents Based on Evidence-Based Safety: A Case Study in China," Sustainability, MDPI, vol. 14(24), pages 1-16, December.
    8. Hou, Ya-nan & Nie, Bai-sheng & Zhang, Zhe-hao & Kong, Fan-bei & Zhao, Dan & Wang, Xiao-tong & Wang, Cai-ping, 2022. "Inhibitory effect of green antioxidants acting on surface groups and structure on lignite," Energy, Elsevier, vol. 257(C).
    9. Lv, Hongpeng & Li, Bei & Deng, Jun & Ye, Lili & Gao, Wei & Shu, Chi-Min & Bi, Mingshu, 2021. "A novel methodology for evaluating the inhibitory effect of chloride salts on the ignition risk of coal spontaneous combustion," Energy, Elsevier, vol. 231(C).
    10. Huang, Zhian & Song, Donghong & Hu, Xiangming & Zhang, Yinghua & Gao, Yukun & Quan, Sainan & Yin, Yichao & Yang, Yifu & Luo, Hongsen & Ji, Yucheng, 2022. "A novel nano-modified inhibitor of tert-butyl hydroquinone/sodium polyacrylate for inhibiting coal spontaneous combustion," Energy, Elsevier, vol. 256(C).
    11. Xu, Xiaoxue & Yuan, Shujie & Li, Jinhu & Guo, Shengli & Yan, Zhuo, 2023. "Preparation of lignin-based intumescent nanogel and its mechanism of inhibiting coal spontaneous combustion," Energy, Elsevier, vol. 275(C).
    12. Yutao, Zhang & Yuanbo, Zhang & Yaqing, Li & Xueqiang, Shi & Yujie, Zhang, 2021. "Heat effects and kinetics of coal spontaneous combustion at various oxygen contents," Energy, Elsevier, vol. 234(C).
    13. Guo, Shengli & Yan, Zhuo & Yuan, Shujie & Weile Geng,, 2021. "Inhibitory effect and mechanism of l-ascorbic acid combined with tea polyphenols on coal spontaneous combustion," Energy, Elsevier, vol. 229(C).

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