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Evolution characteristics of coal microstructure and its influence on methane adsorption capacity under high temperature pyrolysis

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  • Yang, Wei
  • Wang, Yihan
  • Yan, Fazhi
  • Si, Guangyao
  • Lin, Baiquan

Abstract

The ability of coal to absorb gas is one of the most important factors affecting the prevention and control of mine gas-related disasters and safe exploitation of coal seam gas. In this paper, high gas content coal samples from the Pingdingshan mining area are selected as the research object. The micro molecular structure of coal is altered by pyrolysis, combined with experimental methods such as infrared spectroscopy, isothermal adsorption and liquid nitrogen adsorption. The evolution characteristics of functional groups of coal during high temperature pyrolysis and the variation of gas adsorption capacity of coal after pyrolysis at different temperatures were studied from a micro level. The results show that when the pyrolysis temperature increased from 20 °C to 750 °C, the methane adsorption capacity of coal samples decreased with the increase of pyrolysis temperature. CC, –OH, CO, –CH2 in coal molecules gradually decreased. In terms of the effect of functional groups and the pore structure on methane adsorption, the methane adsorption capacity in descending order is: CC > –OH > CO > –CH2. The results of this study provide theoretical guidance for the development of new technologies for the development of coalbed methane thermal injection mining technology.

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  • Yang, Wei & Wang, Yihan & Yan, Fazhi & Si, Guangyao & Lin, Baiquan, 2022. "Evolution characteristics of coal microstructure and its influence on methane adsorption capacity under high temperature pyrolysis," Energy, Elsevier, vol. 254(PA).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011653
    DOI: 10.1016/j.energy.2022.124262
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    References listed on IDEAS

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    1. Gan, Qingqing & Xu, Jiang & Peng, Shoujian & Yan, Fazhi & Wang, Ruifang & Cai, Guoliang, 2021. "Effect of heating on the molecular carbon structure and the evolution of mechanical properties of briquette coal," Energy, Elsevier, vol. 237(C).
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    Cited by:

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    2. Dang, Zheng & Su, Linan & Wang, Xiaoming & Hou, Shihui, 2023. "Experimental study of the effect of ClO2 on coal: Implication for coalbed methane recovery with oxidant stimulation," Energy, Elsevier, vol. 271(C).
    3. Song, Haoran & Zhong, Zheng & Lin, Baiquan, 2023. "Impact of methane gas diffusion in coal on elastic modulus and porosity: Modeling and analysis," Energy, Elsevier, vol. 271(C).
    4. Li, Yunzhuo & Ji, Huaijun & Li, Guichuan & Hu, Shaobin & Liu, Xu, 2023. "Effect of supercritical CO2 transient high-pressure fracturing on bituminous coal microstructure," Energy, Elsevier, vol. 282(C).
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    6. Yang, Dingding & Peng, Kai & Zheng, Yu & Chen, Yujia & Zheng, Juan & Wang, Man & Chen, Si, 2023. "Study on the characteristics of coal and gas outburst hazard under the influence of high formation temperature in deep mines," Energy, Elsevier, vol. 268(C).

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