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Experimental and Numerical Study on Scale Effects of Gas Emission from Coal Particles

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Abstract

In order to study the scale effects and formation mechanism of gas emission from coal particles, we conducted gas desorption and diffusion experiments, investigated the variation of particle size and its effect on gas flow, analyzed and discussed the control mechanism and gas diffusion model of coal. Based on the above, we found that the bidisperse diffusion model was suitable to study the size effects of gas emission and further established a simplified numerical method of bidisperse diffusion model and compared it with the experiment results. The results showed that the accumulated gas emission volume and the initial gas emission speed have scale characteristics. The scale effects of gas emission from coal are determined by the multi-scale pore structure of coal. The diffusion coefficient and path of coal particle determined the gas flow process. Through the gas desorption and diffusion experiments, we can find a way to determine the critical diffusion parameters. On the basis of experiments and theoretical analyses performed, the processes of gas emission from coal particles are studied and their mathematical models are put forward. These models can describe the experimental phenomena fairly.

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Acknowledgments

This work is supported by the China Postdoctoral Science Foundation Funding (2015M582313) and General Program from the National Natural Science Foundation of China (No. 41172285).

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Authors and Affiliations

  1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei Province, China

    Shaobin Hu & Xiaochun Li

  2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu Province, China

    Enyuan Wang

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  1. Shaobin Hu
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  2. Xiaochun Li
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  3. Enyuan Wang
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Correspondence to Enyuan Wang.

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Hu, S., Li, X. & Wang, E. Experimental and Numerical Study on Scale Effects of Gas Emission from Coal Particles. Transp Porous Med 114, 133–147 (2016). https://doi.org/10.1007/s11242-016-0730-y

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