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Analytical Prediction of Coal Spontaneous Combustion Tendency: Pore Structure and Air Permeability

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  • Bin Du

    (China Coal Science Research Institute, Beijing 100013, China
    State Key Laboratory of Coal Mine Safety Technology, China Coal Technology and Engineering Group, Shenyang Research Institute, Shenfu Demonstration Zone, Fushun 113122, China
    College of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100080, China)

  • Yuntao Liang

    (China Coal Science Research Institute, Beijing 100013, China
    State Key Laboratory of Coal Mine Safety Technology, China Coal Technology and Engineering Group, Shenyang Research Institute, Shenfu Demonstration Zone, Fushun 113122, China
    College of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100080, China)

  • Fuchao Tian

    (China Coal Science Research Institute, Beijing 100013, China
    State Key Laboratory of Coal Mine Safety Technology, China Coal Technology and Engineering Group, Shenyang Research Institute, Shenfu Demonstration Zone, Fushun 113122, China
    College of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100080, China)

  • Baolong Guo

    (State Key Laboratory of Coal Mine Safety Technology, China Coal Technology and Engineering Group, Shenyang Research Institute, Shenfu Demonstration Zone, Fushun 113122, China
    College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

In previous research, many scientists and researchers have carried out related studies about the spontaneous combustion of coal at both the micro and the macro scales. However, the macroscale study of coal clusters and piles cannot reveal the nature of oxidation and combustion, and the mesoscale study of coal molecule and functional groups cannot be directly applied to engineering practice. According to our literature survey, coal is a porous medium and its spontaneous combustion is a multi-scale process. Thus, the mesoscale study of coal’s spontaneous combustion is essential. In this manuscript, the mesoscale of the coal body (such as pore size, pore volume, and specific surface area), and the meso-scale structural morphological characteristics of the coal surface are finely analyzed and characterized. On this basis, the meso-scale structure of pores and fractures are digitally reconstructed. Furthermore, velocity and pressure distributions of the flow field in the pores of the scan plane are outlined and described by numerical simulation. The results indicate that, because of the pore structure characteristics and fluid viscosity, not all fluids in the pores demonstrate flow. This conclusion well explains the source of CO gas in methane extraction pipes, which is one of the main index/indicator gases of the spontaneous combustion of coal.

Suggested Citation

  • Bin Du & Yuntao Liang & Fuchao Tian & Baolong Guo, 2023. "Analytical Prediction of Coal Spontaneous Combustion Tendency: Pore Structure and Air Permeability," Sustainability, MDPI, vol. 15(5), pages 1-19, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:5:p:4332-:d:1083649
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    References listed on IDEAS

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    1. Li, Lei & Ren, Ting & Zhong, Xiaoxing & Wang, Jiantao, 2022. "Study of ambient temperature oxidation in low metamorphic coal and the oxidation mechanism," Energy, Elsevier, vol. 252(C).
    2. Sun, Lulu & Zhang, Chen & Wang, Gang & Huang, Qiming & Shi, Quanlin, 2022. "Research on the evolution of pore and fracture structures during spontaneous combustion of coal based on CT 3D reconstruction," Energy, Elsevier, vol. 260(C).
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    Cited by:

    1. Yuxuan Zhou & Shugang Li & Yang Bai & Hang Long & Yuchu Cai & Jingfei Zhang, 2023. "Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal," Sustainability, MDPI, vol. 15(12), pages 1-19, June.

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