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Methane Desorption Characteristics of Coal at Different Water Injection Pressures Based on Pore Size Distribution Law

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  • Dong Zhao

    (Department of Safety Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of In Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
    Graduate Student Education and Innovation Center in Coal Mine safety of Shanxi Province, Taiyuan 030024, China)

  • Tao Gao

    (Department of Safety Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of In Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
    Graduate Student Education and Innovation Center in Coal Mine safety of Shanxi Province, Taiyuan 030024, China)

  • Yulin Ma

    (School of Mechanics & Engineering, Liaoning Technical University, Fuxing 123000, China)

  • Zengchao Feng

    (Key Laboratory of In Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

Methane desorption characteristics of coal under definite water pressure comprises a complex two-phase flow process. A series of mercury intrusion porosimetry (MIP) and desorption experiments at different water injection pressures are reported in this study. Three lumpy coal samples were used in desorption experiments at three different water injection pressures and at natural desorption for comparison. Samples comprising two ranks of coal were used for MIP measurements including the distribution of porosity and pore sizes. The results of this study enable the establishment of a new model that encompasses a critical theoretical pore size that is most effective for water injection into coalbeds and that can be related to water injection pressure, the length of residual water, and gas adsorption capacity. Data show that the use of different water injection pressures leads to different gas desorption capacities as well as variable time effects and degree of gas desorption. Critical pore size is therefore proposed as a new parameter that can be employed to describe high pressure water effects in the context of gas desorption and can be calculated using pore size and the volume distribution law, as well as via the moisture ratio that remains after experiments and the permanent desorption percentage.

Suggested Citation

  • Dong Zhao & Tao Gao & Yulin Ma & Zengchao Feng, 2018. "Methane Desorption Characteristics of Coal at Different Water Injection Pressures Based on Pore Size Distribution Law," Energies, MDPI, vol. 11(9), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2345-:d:167990
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    References listed on IDEAS

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    1. Xiangjun Chen & Yuanping Cheng, 2015. "Influence of the injected water on gas outburst disasters in coal mine," 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. 76(2), pages 1093-1109, March.
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    Cited by:

    1. Yong Xu & Xuexi Chen & Wei Zhao & Peng Chen, 2022. "Experimental and Numerical Simulation of Water Adsorption and Diffusion in Coals with Inorganic Minerals," Energies, MDPI, vol. 15(12), pages 1-15, June.
    2. Magdalena Tutak, 2019. "The Influence of the Permeability of the Fractures Zone Around the Heading on the Concentration and Distribution of Methane," Sustainability, MDPI, vol. 12(1), pages 1-24, December.
    3. Rasa Smaliukiene & Svajone Bekesiene, 2020. "Towards Sustainable Human Resources: How Generational Differences Impact Subjective Wellbeing in the Military?," Sustainability, MDPI, vol. 12(23), pages 1-21, November.

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