薄煤层Y型通风采场瓦斯分布规律研究  

Study on gas distribution law in working face with Y-type ventilation of thin coal seam

作　　者：李良伟 武文宾 林府进[1,2] LI Liangwei;WU Wenbin;LIN Fujin(CCTEG Chongqing Research Institute,Chongqing 400037,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037 [2]瓦斯灾害监控与应急技术国家重点实验室,重庆400037

出　　处：《矿业安全与环保》2021年第3期17-21,26,共6页Mining Safety & Environmental Protection

基　　金：国家科技重大专项项目(2016ZX05045004002);山东省重大科技创新工程项目(2019SDZY02)。

摘　　要：为揭示“两进一回”Y型通风方式采场瓦斯流动与分布规律,利用多孔介质模型对Y型通风采场及采空区瓦斯流动进行数值模拟。结果表明:当进风巷、运输巷配风比为1∶1时,上隅角处因局部阻力与风流转向出现了低速紊流区从而导致瓦斯聚积;由于尾巷与进风巷相联通,靠近上隅角处采空区的瓦斯会涌入工作面;工作面瓦斯浓度随着进风巷与运输巷配风比的增大而降低,运输巷瓦斯浓度随配风比的增大整体呈微降趋势;采空区瓦斯浓度沿走向方向呈先升高后降低再升高的趋势,随着配风比的增大,瓦斯浓度整体呈现增高的趋势。研究结果可为工作面配风比的选择提供依据。In order to reveal the law of gas flow and distribution in working face with“two inlets and one return”Y-type ventilation,the gas flow in working face with Y-type ventilation and goaf was simulated numerically by porous media model.The results show that:when the air distribution ratio of intake airflow roadway and headentry is 1∶1,gas accumulates in the upper corner due to the low speed turbulence zone caused by local resistance and airflow diversion;because the tail roadway is connected with the intake airflow roadway,gas emission occurs in the upper corner of the working face;the gas concentration in the working face decreases with the increase of the air distribution ratio between the intake airflow roadway and headentry,and the gas concentration in the headentry shows a slight decrease trend overall with the increase of the air distribution ratio;the gas concentration in goaf increases first,then decreases,and then increases along the direction,with the increase of air distribution ratio,the gas concentration increases as a whole.The research results can provide a basis for the selection of air distribution ratio in working face.

关 键 词：Y型通风 瓦斯分布 多孔介质模型 配风比 采空区 尾巷 

分 类 号：TD712[矿业工程—矿井通风与安全] TD724