文献类型：期刊文献

英文题名：Study on the gas desorption law and indicator influencing factors of fixed-size coal samples

作者：Li, Lei Sun, Zhongguang Wang, Fakai Zhang, Kaizhi

第一作者：Li, Lei

通信作者：Wang, FK[1];Wang, FK[2]

机构：[1]Chongqing Univ, Coll Resources & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;[2]China Coal Technol & Engn Grp Crop, Chongqing Res Inst, Chongqing 400037, Peoples R China;[3]Guizhou Inst Technol, Coll Min Engn, Guiyang 550000, Guizhou, Peoples R China

第一机构：Chongqing Univ, Coll Resources & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China

通信机构：corresponding author), Chongqing Univ, Coll Resources & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;corresponding author), Guizhou Inst Technol, Coll Min Engn, Guiyang 550000, Guizhou, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2019

卷号：9

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：;Scopus(收录号：2-s2.0-85075456900);WOS:【SCI-EXPANDED(收录号:WOS:000497710700012)】；

基金：This study is financially supported by the Guizhou Science and Technology Fund Project (No. 2014-7370), and the Science and Technology Innovation and Entrepreneurship Fund of Tiandi Science & Technology Co.,Ltd (No. 2018-TD-QN062), which are gratefully acknowledged. The authors also thank the editor and anonymous reviewers for their valuable advice.

语种：英文

摘要：The prediction of dangerous hazards in working faces is an important link to prevent coal and gas outbursts. Improving the accuracy of predictive indicators is of great significance for reducing the phenomenon of being prominently below the critical value and ensuring safe production. The fixed-size desorption index K-1 is one of the important indicators for coal face and gas outburst prediction. Based on the diffusion theory and the physical meaning of fixed-size coal samples, the mathematical expression of K-1 is established by the self-developed high/low temperature pressure swing adsorption-desorption experimental system. According to the equation, the effects of gas pressure, loss time, coal particle size and diffusion coefficient on K-1 are studied. The results show that the K-1 index is logarithmically related to the gas pressure. Under the same conditions, the longer the loss time is, the smaller the measured K-1 is, and the smaller the particle sizes of the drill cuttings are, the more notable the performance is; the diffusion coefficient represents the ability of gas to bypass micropores and the coal matrix. The greater the ability to bypass the matrix is, the larger the diffusion coefficient under the same conditions is, and the larger K-1 is; the coal particle size has a greater influence on K-1, and the smaller the size is, the more likely it is that the phenomenon of being prominently below the critical value occurs. Therefore, the particle size composition of coal during on-site measurements is crucial for obtaining the true K-1 and the exact critical values.