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Effect of water immersion on pore structure of bituminous coal with different metamorphic degrees

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  • Song, Bobo
  • Zhai, Xiaowei
  • Ma, Teng
  • Wang, Bo
  • Hao, Le
  • Zhou, Yujie

Abstract

It is important to understand the disaster-causing mechanism of dried water-immersed coal by investigating the influence of water immersion on the coal pore structure. In this study, low-temperature nitrogen adsorption experiments of eight bituminous coals with different metamorphic degrees and their dried water-immersed coals were carried out to analyze the adsorption/desorption mechanism and investigate the effects of water immersion on the pore shape, pore-structure parameters, and fractal dimension of coal. The results showed that adsorption of nitrogen on coal mainly includes micropore filling, monolayer adsorption, multilayer adsorption, and capillary condensation. The pores of coal were a continuous system from nanometer pores to relatively unlimited size pores. Water immersion did not significantly affect the pore shape of the coal, decreased the specific surface area and adsorption capacity, and increased the total pore volume and average pore diameter. It had the greatest effect on the average pore size of moderately metamorphosed coals, which may accelerate the oxidation process of coal and aggravate gas emission. The fractal results showed that water immersion reduced the surface fractal dimension of higher and lower metamorphic coal, while it increased that of moderately metamorphic coal, and it had the opposite effect on the structural fractal dimension.

Suggested Citation

  • Song, Bobo & Zhai, Xiaowei & Ma, Teng & Wang, Bo & Hao, Le & Zhou, Yujie, 2023. "Effect of water immersion on pore structure of bituminous coal with different metamorphic degrees," Energy, Elsevier, vol. 274(C).
    • Handle: RePEc:eee:energy:v:274:y:2023:i:c:s0360544223008435
    DOI: 10.1016/j.energy.2023.127449
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    References listed on IDEAS

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    1. Wang, Kai & Han, Tao & Deng, Jun & Zhang, Yanni, 2022. "Comparison of combustion characteristics and kinetics of Jurassic and Carboniferous-Permian coals in China," Energy, Elsevier, vol. 254(PB).
    2. Wang, Kai & Hu, Lihong & Deng, Jun & Zhang, Yanni, 2023. "Multiscale thermal behavioral characterization of spontaneous combustion of pre-oxidized coal with different air exposure time," Energy, Elsevier, vol. 262(PA).
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    1. Huang, Jiliang & Tan, Bo & Gao, Liyang & Shao, Zhuangzhuang & Wang, Haiyan & Chen, Zhen, 2023. "A multi-channel reaction model study of key primary and secondary active groups in the low-temperature oxidation process of coal," Energy, Elsevier, vol. 283(C).
    2. Wei, Jianguang & Zhang, Dong & Zhou, Xiaofeng & Zhou, Runnan & Shamil, Sultanov & Li, Jiangtao & Gayubov, Abdumalik & Hadavimoghaddam, Fahimeh & Chen, Yinghe & Xia, Bing & Fu, Ping & Wang, Yue, 2024. "Characterization of pore structures after ASP flooding for post-EOR," Energy, Elsevier, vol. 300(C).
    3. Zhang, Xun & Liang, Huimin & Lu, Bing & Qiao, Ling & Huang, Ge & Yu, Chen & Zou, Jiahui, 2024. "Correlation and stage change of key groups and thermal effects of spontaneous coal combustion due to long-term ultraviolet illumination," Energy, Elsevier, vol. 293(C).
    4. Zhang, Leilin & Wen, Chenchen & Li, Shengli & Yang, Mengdan, 2024. "Evolution and oxidation properties of the functional groups of coals after water immersion and air drying," Energy, Elsevier, vol. 288(C).
    5. Yongkai Qiu & Dingjun Chang & Fengrui Sun & Abulaitijiang Abuduerxiti & Yidong Cai, 2023. "Permeability Evolution of Bituminous Coal and Its Dynamic Control, a Case Study from the Southeastern Ordos Basin, China," Energies, MDPI, vol. 16(24), pages 1-18, December.

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