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为解决综放工作面回采期间瓦斯涌出量大、瓦斯抽采导致采空区漏风增加且易发生自然发火的问题,以红庙矿5-2S工作面自然发火和瓦斯抽采综合治理为例,采用现场实测和数值模拟相结合的方法,运用流体计算软件COMSOL对不同抽采量、不同抽采口位置时对氧化升温带影响规律进行研究.研究结果表明:采空区自燃“三带”数值模拟变化规律与现场监测数据相吻合;采空区瓦斯抽采量和抽采口所在位置与采空区自然发火危险性成正相关;5-2S工作面推进速度从3 m/d增加到3.2 m/d,瓦斯极限抽采量由31.71 m~3/h增加到120 m~3/h;距工作面切顶线10~20 m是采空区工作面最佳抽采位置.
In order to solve the problem of large gas emission during the recovery period of the fully mechanized top coal caving face, gas leakage caused by the gas drainage in gob area and prone to spontaneous combustion, taking the natural ignition and gas drainage of 5-2S working face of Hongmiao Mine as an example , Using the combination of on-site measurement and numerical simulation, the influence of different extraction volume and pumping port location on the oxidation temperature increase zone was studied by fluid calculation software COMSOL.The results show that the spontaneous combustion "The numerical simulation is consistent with the on-site monitoring data; the amount of gas drainage in the goaf and the location of the extraction port are positively related to the risk of spontaneous combustion in the goaf; the propulsion speed of the 5-2S face increases from 3 m / d To 3.2 m / d, the gas extraction limit increased from 31.71 m 3 / h to 120 m 3 / h, and the top cut of 10 ~ 20 m from the working face is the best drainage place for working face of goaf.