赵庄矿高抽巷抽采负压优化模拟研究

Optimization of Negative Pressure Parameters for High Drainage Roadway in Zhaozhuang Mine

为研究高抽巷抽采负压对治理采空区瓦斯的影响并寻求最优抽采参数,以赵庄矿1309工作面为背景,通过数值计算得到布置垂高应为25m,平距应为20m。通过FLUENT软件对进行高抽巷不同抽采负压条件下的数值模拟,并采用UDF程序定义采空区参数使模拟结果接近实际。模拟结果表明:在无抽采模型下,工作面上隅角瓦斯浓度最高可达18%,影响安全回采。高抽巷抽采条件下增大抽采负压,采空区瓦斯浓度降低,上隅角附近的低瓦斯浓度区域由不存在逐渐扩大。高抽巷瓦斯体积分数及抽采纯量在抽采负压高于20kPa后增量趋于平缓。为保证抽采效果同时避免采空区漏风,确定合理抽采负压为20kPa。现场实测高抽巷瓦斯抽采纯量平均为43.93m^3/min,与模拟结果基本吻合。

In order to study the influence of negative pressure in high drainage roadway on gas control in goaf and to find the optimum drainage parameters,the vertical height and horizontal distance should be 25 m and 20 m respectively in Zhaozhuang Mine 1309 working face.FLUENT software is used to carry out numerical simulation under different negative pressure conditions of high drainage roadway,and UDF program is used to define the parameters of goaf to make the simulation results close to reality.The simulation results show that the maximum gas concentration in the upper corner of the working face can reach 18% withour extraction model,which affects the safe mining.With the condition of high drainage roadway,the negative pressure of drainage increases,the gas concentration in goaf decreases,and the low gas concentration area near the upper corner expands gradually from nonexistence.The increment of gas volume fraction and extraction volume of high drainage roadway tends to be gentle after drainage negative pressure is higher than 20 kPa.In order to ensure the effect of extraction while avoiding the air leakage in the goaf,the reasonable drainage negative pressure is determined to be 20 kPa.The average amount of gas extraction in the high drainage roadway is 43.93 m^3/min on the spot,which is basically consistent with the simulation results.