Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal

Yuxuan Zhou (), Shugang Li (), Yang Bai, Hang Long, Yuchu Cai and Jingfei Zhang
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Yuxuan Zhou: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Shugang Li: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yang Bai: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Hang Long: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yuchu Cai: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Jingfei Zhang: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Sustainability, 2023, vol. 15, issue 12, 1-19

Abstract: The pore structure of low-rank coal reservoirs was highly complex. It was the basis for predicting the gas occurrence and outburst disasters. Different scale pores have different effects on adsorption–desorption, diffusion, and seepage in coalbed methane. To study the pore structure distribution characteristics, which are in different scales of low-rank coal with different metamorphism grade, the pore structure parameters of low-rank coal were obtained by using the mercury injection, N 2 adsorption, and CO 2 adsorption. These three methods were used to test the pore volume and specific surface area of low-rank coal in their test ranges. Then, the fractal dimension method was used to calculate the fractal characteristics of the pore structure of full aperture section to quantify the complexity of the pore structure. The experimental results showed that the pore volume and specific surface area of low-rank coal were mainly controlled by microporous. The pore fractal characteristics were obvious. With the influence of coalification process, as the degree of coal metamorphism increases, fluctuations in the comprehensive fractal dimension, specific surface area, and pore volume of the pore size range occur within the range of R max = 0.50% to 0.65%.

Keywords: low-rank coal; pore structure; comprehensive fractal dimension; fractal law (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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