某煤矿极近距离上覆老空区注氮—抽放稀释置换瓦斯数值模拟分析  

Numerical Simulation Analysis of Nitrogen Injection and Drainage of Dilution Replacement Gas in the Overlying Old Goaf Closely in a Coal Mine

作　　者：王磊[1] WANG Lei(Malan Coal Mine,Shanxi Xishan Coal and Electricity Co.,Ltd.)

机构地区：[1]山西西山煤电股份有限公司马兰矿

出　　处：《现代矿业》2021年第5期94-96,100,共4页Modern Mining

摘　　要：为了防止下分层回采期间瓦斯涌出及浓度超限,论证上覆老空区通过注氮—抽放稀释置换瓦斯技术方案的可行性。根据某煤矿煤层赋存的地质条件,通过数值模拟的方法,对注氮—抽放模式下老空区瓦斯浓度变化情况进行了模拟分析。模拟结果显示,通过对老空区间歇注氮—抽放,可有效稀释瓦斯浓度及置换瓦斯赋存量,这对后续工程实践提供了指导。In order to prevent the gas outbursting and concentration exceeding the limit during the mining of the lower layer,the feasibility of the technical solution of replacing the gas by nitrogen injectiondrainage and dilution in the overlying old goaf was demonstrated.According to the geological conditions of coal seams in a coal mine,numerical simulation method is used to simulate and analyze the changes of gas concentration in the old goaf under the nitrogen injection-drainage mode.The simulation results show that intermittent nitrogen injection-drainage in the old goaf can effectively dilute the gas concentration and replace the amount of gas,which provides guidance for subsequent engineering practices.

关 键 词：空区 瓦斯涌出 注氮—抽放 稀释置换 

分 类 号：TD712[矿业工程—矿井通风与安全]