LNMR experimental study on influence of confining pressure on gas adsorption laws of high rank coal

被引：0

作者：

Yang M. ^{[1
,2
,3
]}

Liu L. ^{[2
]}

Liu J. ^{[1
,2
,3
]}

Hong L. ^{[2
]}

Mao J. ^{[2
]}

Chai P. ^{[2
]}

机构：

[1] State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo

[2] School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo

[3] State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2020年 / 37卷 / 06期

关键词：

Different confining pressure; Gas adsorption capacity; Gas adsorption rate; High rank coal; LNMR;

D O I：

10.13545/j.cnki.jmse.2020.06.023

中图分类号：

学科分类号：

摘要：

In order to understand the influence of confining pressure on the gas adsorption law of high-rank coal, the high-rank coal of Zhaogu Mine in Jiaozuo was taken as the research object and the low-field nuclear magnetic resonance (LNMR) system and the confining pressure loading system were used to carry out gas adsorption experiments of high-rank coal under different confining pressures. The results showed that three characteristic peaks (adsorption peaks, free peaks, and free peaks) appeared in the T2 spectrum during the gas adsorption process of high-order coal. It was found that the micro-pores of high-rank coals are well developed, the medium-large pores are not developed, and the permeability is poor. Under the same confining pressure, with the increase of the adsorption time, the adsorption amount increased first and then remained unchanged, the adsorption increment gradually decreased and reached the adsorption equilibrium within 7 h. With the increase of confining pressure, the adsorption saturation and initial adsorption velocity decreased gradually, and the time needed to reach adsorption equilibrium increased. The increase of confining pressure has a significant contraction effect on the pore structure of medium and large pores, but has no obvious effect on the pore structure of small pores. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：1274 / 1281

页数：7

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