摘要
为了研究高瓦斯综采工作面下的采空区瓦斯分布规律,以某矿15110综采工作面采空区为原型,使用FLUENT软件对U型、U型+高抽巷、Y型、Y型+高抽巷+采空区埋管抽采进行数值模拟和分析。结果表明:相比于U型通风下采空区上部瓦斯积聚严重,U型通风联合高抽巷能有效降低采空区裂隙带的瓦斯,高抽巷瓦斯浓度和混合流量模拟值分别为43.52%、197.50 m^(3)/min,与现场监测值接近;但上隅角瓦斯浓度偶尔超限。在Y型通风下,瓦斯浓度随着采空区深度的增加而升高,随着靠近沿空回风巷而升高;上隅角瓦斯浓度相比于U型通风能有效降低。相比于Y型通风下沿空回风巷瓦斯浓度容易超限,Y型通风联合高抽巷、采空区埋管抽采的瓦斯防控体系能有效降低高瓦斯综采工作面的瓦斯浓度,为解决高瓦斯综采工作面瓦斯超限难题提供了理论指导。
In order to study the gas distribution law of the goaf under high-gas fully-mechanized mining face,taking the goaf of 15110 fully-mechanized mining face of a mine as the prototype,the numerical simulation and analysis of U-type,U-type+high drainage roadway,Y-type,Y-type+high drainage roadway+buried tube drainage in the goaf were carried out by FLUENT software.The results show that compared with the serious gas accumulation in the upper part of the goaf under U-type ventilation,the U-type ventilation combined with high drainage roadway can effectively reduce the gas in the fractured zone of the goaf.The simulated values of gas concentration and mixed flow in the high drainage roadway are 43.52%and 197.50 m^(3)/min respectively,which are close to the field monitoring values.However,the gas concentration in the upper corner occasionally exceeds the limit.Under the Y-type ventilation,the gas concentration increases with the increase of the goaf depth,and it increases by approaching the goaf return air roadway.Compared with the U-type ventilation,the gas concentration in the upper corner can be effectively reduced.Compared with the Y-type ventilation,it is easy for the gas concentration in gob-side return air roadway to exceed the limit,the gas prevention and control system of Y-type ventilation combined with high drainage roadway and the buried tube drainage in goaf can effectively reduce the gas concentration in the high-gas fully-mechanized mining face,which provides theoretical guidance for solving the problem of gas overlimit in high-gas fully-mechanized mining face.
作者
范红伟
杨涛
FAN Hongwei;YANG Tao(Shanxi Engineering Vocational College,Taiyuan 030032,China;North China Institute of Science and Technology,Beijing 101601,China)
出处
《煤炭技术》
CAS
北大核心
2022年第2期113-116,共4页
Coal Technology
基金
国家自然科学基金项目(51974127)。
关键词
采空区
Y型通风
高抽巷
埋管抽采
数值模拟
goaf
Y-type ventilation
high drainage roadway
buried tube drainage
numerical simulation
作者简介
范红伟(1981-),山西大同人,副教授,硕士,主要从事矿井通风及煤矿安全技术的教学与科研工作,电子信箱:hap-py603@126.com.
