Comparative Study of Pore Structure Characteristics between Mudstone and Coal under Different Particle Size Conditions

Jianguo Zhang, Xiyuan Li, Jihong Jiao, Jianbao Liu, Feng Chen and Zhimin Song
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Jianguo Zhang: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Xiyuan Li: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Jihong Jiao: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Jianbao Liu: School of Environmental and Biological Engineering, Henan University of Engineering, No. 1, Xianghe Road, Zhengzhou 451191, China
Feng Chen: School of Environmental and Biological Engineering, Henan University of Engineering, No. 1, Xianghe Road, Zhengzhou 451191, China
Zhimin Song: School of Environmental and Biological Engineering, Henan University of Engineering, No. 1, Xianghe Road, Zhengzhou 451191, China

Energies, 2021, vol. 14, issue 24, 1-10

Abstract: In order to investigate the difference of pore structure characteristics between mudstone and coal under different particle size conditions, samples acquired from Henan province were smashed and screened into three different particle sizes (20–40, 80–100, and >200 mesh) to conduct the experiments, using the high-pressure mercury intrusion porosimetry (MIP) and low-temperature N 2 adsorption (LT-N 2 A) techniques. The results demonstrated that the proportion of open pores or semi-enclosed pores increased, and the pores became preferable contacted each other for both mudstone and coal during the crushing process. These variations of pore structure characteristics in the coal were beneficial to methane storage and migration. The total specific surface areas and pore volumes all showed a tendency of increasing continually for both mudstone and coal, as the particle sizes decreased from the LT-N 2 A test. The mudstone and coal were non-rigid aggregates with micropores, plate-shaped pores, and slit-shaped pores developed inside. The effect of the crushing process on the pore shape for the mudstone and coal was inappreciable. Moreover, the influence of the particle sizes on the mesopore was the most significant, followed by the macropore; and on the micropore, the influence was negligible for both mudstone and coal. The crushing process only had a significant impact on the pore structure of mudstone with a particle size of less than 100 mesh, while it could still alter the pore structure of coal with a particle size of larger than 100 mesh. It is believed that this work has a significant meaning to explore the diffusion and migration rules of coal-bed methane in coal.

Keywords: coal; mudstone; pore structure characteristics; mercury intrusion porosimetry measurement; low-temperature N 2 adsorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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