Effect of load on adsorption characteristics of remolded coal

Authors

DAI Juhua, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
WANG Zhaofeng, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Ministry of Eduction Engineering Center of Mine Disaster Prevention and Rescue, Jiaozuo 454003, China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, China
LI Xuechen, Jiaozuo Coal Industry(Group) Co. Ltd., Jiaozuo 454000, China
LI Yanfei, Guhanshan Mine, Henan Energy Group Jiaozuo Co. Ltd., Jiaozuo 454300, China
YUE Jiwei, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Abstract

In view of the difficulty in preparing the coal with broken soft structure intact, it needs to be processed into remolded coal. In order to study the influence of suppression loads on the physical characteristics of coal, the micro-pore structure and adsorption characteristics of remolded coal under different molding loads were discussed based on the pore test experiment of low temperature liquid nitrogen and the methane adsorption experiment of high pressure capacity method. The results show that: The pore volume of micropores and pores decreases slightly with the increase of molding load, the specific surface area increases slightly with the increase of molding load, and the reduction of total pore volume and the increase of pore specific surface area are not obvious. According to the fractal theory, it is found that the pore structure has obvious fractal characteristics, and the fractal dimension in the high pressure section is generally lower than that in the low pressure section, and the fractal dimension of remolded coal formed by different loads has little difference. The adsorption isotherm curves conform to the first type adsorption curve, and Langmuir model is applicable to describe the reshape coal isothermal adsorption remolded coal. The molding load has a certain influence on the adsorption constant of coal. Its influence on adsorption constant b value is greater than that on a value. The study of the adsorption characteristics of remolded coal under different molding loads is of great engineering significance for gas extraction and treatment.

Keywords

remolded coal, adsorption characteristics, adsorption constant, pore structure, fractal dimension

DOI

10.3969/j.issn.1001-1986.2021.03.012

Recommended Citation

DAI Juhua, WANG Zhaofeng, LI Xuechen, et al. (2021) "Effect of load on adsorption characteristics of remolded coal," Coal Geology & Exploration: Vol. 49: Iss. 3, Article 13.
DOI: 10.3969/j.issn.1001-1986.2021.03.012
Available at: https://cge.researchcommons.org/journal/vol49/iss3/13

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