文献类型：期刊文献

英文题名：Research on Adsorption and Desorption Characteristics of Gas in Coal Rock Based on Nuclear Magnetic Resonance Technology

作者：Wu, Xukun Zhao, Guangming Xu, Youlin Meng, Xiangrui Cheng, Xiang

第一作者：Wu, Xukun

通信作者：Zhao, GM[1];Zhao, GM[2];Xu, YL[3]

机构：[1]Anhui Univ Sci & Technol, State Key Lab Min Response & Disaster Prevent & C, Huainan 232001, Anhui, Peoples R China;[2]Anhui Univ Sci & Technol, Sch Min & Safety Engn, Huainan 232001, Peoples R China;[3]Sch Min Engn, Guizhou Inst Technol, Guiyang 550003, Guizhou, Peoples R China

第一机构：Anhui Univ Sci & Technol, State Key Lab Min Response & Disaster Prevent & C, Huainan 232001, Anhui, Peoples R China

通信机构：corresponding author), Anhui Univ Sci & Technol, State Key Lab Min Response & Disaster Prevent & C, Huainan 232001, Anhui, Peoples R China;corresponding author), Anhui Univ Sci & Technol, Sch Min & Safety Engn, Huainan 232001, Peoples R China;corresponding author), Sch Min Engn, Guizhou Inst Technol, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2022

卷号：2022

外文期刊名：GEOFLUIDS

收录：;Scopus(收录号：2-s2.0-85131169568);WOS:【SCI-EXPANDED(收录号:WOS:000806019000006)】；

基金：The study was funded by the National Natural Science Foundation of China (51974009), Anhui Province Science and Technology Major Project, Anhui Province "Provincial Special Expenditure Plan" Leading Talent Project (T000508), Anhui Academic and Technical Leaders Scientific Research Activity Fund (2021), The University Synergy Innovation Program of Anhui Province GXXT-2021075, Anhui Provincial Natural Science Foundation (No. 2008085QE222), and Guizhou Provincial Science and Technology Plan Project (Qiankehe Platform Talents [2019] 5674).

语种：英文

摘要：In order to explore the change characteristics of the adsorption and desorption performance of coal under high gas pressure, low-field nuclear magnetic resonance (LFNMR) technology was used to conduct experimental research on coal adsorption and desorption. The results show that (1) the T-2 spectrum distribution diagram shows adsorption peaks (T-2 = 0.01 ms similar to 1 ms) and free peaks (T-2 = 5 ms similar to 1000 ms); (2) with the increase of equilibrium pressure, the peak area of adsorbed methane gradually increased at first and then tended to equilibrium. The initial increase rate of free methane was slower than that of adsorbed methane, and the increase rate of free methane was faster in the later stage; (3) the relationship between the amount of adsorbed gas in the adsorption state of coal and the gas pressure conforms to the Langmuir equation. Taking the equilibrium pressure P = 8.7 MPa as the critical hysteresis pressure, it can be divided into two stages which are higher gas pressure (0.5 similar to 8.7 MPa) and high gas pressure (8.7 similar to 10.33 MPa); the amount of adsorbed gas in the free state has a linear relationship with the gas pressure, and there is no obvious hysteresis; (4) comparative analysis under the same experimental conditions, the mass of the adsorbed gas in the desorption process is greater than the mass of the adsorbed gas in the adsorption process, and there is basically no difference in the mass of the free gas.