摘要
针对高突低透煤层瓦斯治理的难题,预抽煤层瓦斯是最基本、最有效的措施之一。为提高山西襄矿集团上良煤业有限公司3-2#、3-3#煤层瓦斯抽采率,建立了瓦斯赋存规律与流动特性的物理模型和数学模型,运用COMSOL软件,模拟了瓦斯在多孔介质煤体中吸附过程的力学状态,研究了不同瓦斯抽采参数对抽采效果的影响规律,并通过现场试验对预抽瓦斯抽采效果进行了对比分析。研究结果表明:钻孔间距、孔径对钻孔周围瓦斯在空隙中流动有较大影响,采用大孔径进行瓦斯抽采会增加煤层的抽采率;相对更小的孔间距使钻孔之间更容易相互连通,使富集区的瓦斯相对更容易向瓦斯浓度低的区域流动,形成一种特定的流场。
Aiming at the problem of gas control in high outburst and low permeability coal seams,predraining coal seam gas is one of the most basic and effective measures.In order to improve the gas drainage rate of No.3-2and No.3-3coal seams of Shangliang Coal Industry Co.,Ltd.in Shanxi Xiangkuang Group,a physical model and a mathematical model of gas occurrence law and flow characteristics were established,and the COMSOL software was used to simulate the mechanical state of the gas adsorption process in the porous medium coal,the influence of different gas drainage parameters on the drainage effect was studied,and the pre-drainage gas drainage effect was compared and analyzed through field tests.The study results show that the spacing and diameter of the boreholes have a greater impact on the flow of gas in the voids around the boreholes.The use of large boreholes for gas drainage will increase the extraction rate of the coal seam.The relative smaller borehole spacing makes it easy to communicate with each other,so that the gas in the enrichment area is relatively easier to flow to the area with low gas concentration and forms a specific flow field.
作者
邓强
Deng Qiang(Shenyang Research Institute,China Coal Technology and Engineering Group,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)
出处
《煤矿机械》
2022年第5期167-170,共4页
Coal Mine Machinery
基金
国家自然科学基金面上项目(51774182)
中国煤炭科工集团科技创新创业资金项目(2018MS014)。
关键词
瓦斯流动
孔隙率
钻孔直径
抽采半径
数值模拟
gas flowing
porosity
drilling diameter
drainage radius
numerical simulation
作者简介
邓强(1985-),山西大同人,助理研究员,硕士,主要从事煤矿安全与瓦斯防治研究工作,电子信箱:dqsun811@126.com.
