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A study on a Janus-type composite solidified foam and its characteristics for preventing and controlling spontaneous combustion of coal

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  • Xue, Di
  • Hu, Xiangming
  • Sun, Gongzheng
  • Wang, Kai
  • Liu, Tongyu
  • Wang, Jiqiang
  • Wang, Fusheng

Abstract

To solve the problem of poor effect of plugging air leakage in the prevention and control of coal spontaneous combustion by traditional inorganic solidified foam, Janus-type composite solidified foam (JCSF) was proposed in this study. An ultra-stable aqueous foam (UAF) was synthesized via the modification of the gas-liquid interface by forming a “Janus bilayer” of hydrophobic nano-silica and hydrophilic polyvinyl alcohol. Different techniques were used to study the stability of UAF. In addition, by using non-combustible inorganic materials such as cement and fly ash as the matrix and organic materials as the reinforcement, JCSF was synthesized by the prefabricated foam method, and its formulation was optimized by the response surface methodology. The stability test of UAF indicated that the “Janus bilayer” could effectively inhibit the Ostwald ripening, continuous coalescence, and drainage of the foam. The air leakage plugging efficiency, flame retardancy, fire extinguishing, and stacking characteristics showed that JCSF combined the advantages of traditional inorganic solidified foams and reactive polymer foams. It also showed a higher air leakage plugging efficiency, lower heat production, excellent fire prevention and extinguishing, and strong accumulation capacity.

Suggested Citation

  • Xue, Di & Hu, Xiangming & Sun, Gongzheng & Wang, Kai & Liu, Tongyu & Wang, Jiqiang & Wang, Fusheng, 2023. "A study on a Janus-type composite solidified foam and its characteristics for preventing and controlling spontaneous combustion of coal," Energy, Elsevier, vol. 275(C).
    • Handle: RePEc:eee:energy:v:275:y:2023:i:c:s0360544223008277
    DOI: 10.1016/j.energy.2023.127433
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    References listed on IDEAS

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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. Yan, Li & Wen, Hu & Liu, Wenyong & Jin, Yongfei & Liu, Yin & Li, Chuansheng, 2022. "Adiabatic spontaneous coal combustion period derived from the thermal effect of spontaneous combustion," Energy, Elsevier, vol. 239(PB).
    3. Zhenlu Shao & Deming Wang & Yanming Wang & Xiaoxing Zhong & Xiaofei Tang & Xiangming Hu, 2015. "Controlling coal fires using the three-phase foam and water mist techniques in the Anjialing Open Pit Mine, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(2), pages 1833-1852, January.
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