顶板长钻孔替代高抽巷抽采控瓦斯与采空区注氮防火耦合治理研究  

Study on coupling control of gas drainage and gas control with nitrogen injection andfire prevention in goaf by long roof borehole replacing high drainage roadway

作　　者：郭长恒 邢玉忠 GUO Changheng;XING Yuzhong(College of Safety and Emergency Management Engineering,Taiyuan University of Technology,Jinzhong 030600,China;Center of Shanxi Mine Safety for Graduate Education Innovation,Taiyuan 030024,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西晋中030600 [2]山西省煤矿安全研究生教育创新中心,山西太原030024

出　　处：《中国矿业》2020年第4期97-103,共7页China Mining Magazine

摘　　要：高瓦斯矿井易自燃煤层,工作面受上隅角瓦斯超限与采空区遗煤自燃双重威胁。为解决高抽巷抽采瓦斯导致采空区氧化带面积变大、增大遗煤自燃危险性的问题,以顶板长钻孔替代高抽巷,配合进风巷侧注氮,通过对长钻孔参数与注氮参数的优化,进行防火与控瓦斯耦合治理的研究。以中兴煤业1401工作面实测数据结合ANSYS数值模拟,研究了长钻孔数量、位置对工作面上隅角瓦斯的影响规律,获得以5个直径300 mm、距回风巷10 m、距煤层底板15 m的顶板长钻孔替代高抽巷的最优方案。在此基础上,为保障对采空区遗煤自燃的有效控制,研究了注氮量与注氮位置对采空区氧化带分布的影响规律,获得在进风巷侧氧化带与散热带分界位置注入5.5 m 3/min的氮气,将采空区氧化带宽度降至25 m的优选结果。通过对上隅角瓦斯与采空区遗煤自燃的综合控制,保证了工作面的安全生产。High gas mine is easy to spontaneous combustion coal seam,working face is threatened by gas exceeding limit in upper corner and spontaneous combustion of residual coal in goaf.In order to solve the contradiction between gas drainage in high gas extraction roadway and enlargement of oxidation zone area in goaf and increase the risk of spontaneous combustion of residual coal.The roof long borehole is used to replace the high extraction roadway,and the side injection of nitrogen into the air intake roadway is used.Through optimizing the parameters of long borehole and nitrogen injection,the coupling control of fire prevention and gas control is studied.Based on the measured data of 1401 working face of Zhongxing Coal Industry and ANSYS numerical simulation,the influence of the number and location of long boreholes on the gas in the upper corner of working face is studied.The optimum scheme of replacing high extraction roadway with 5 roof long boreholes of 300 mm in diameter,10 m away from return air roadway and 15 m away from the floor plate of coal seam is obtained.On this basis,in order to ensure effective control of spontaneous combustion of residual coal in goaf,the effects of nitrogen injection amount and location on distribution of oxidation zone in goaf are studied.The optimal results are obtained by injecting 5.5 m 3/min nitrogen into the boundary of oxidation zone and heat dissipation zone on the side of air inlet roadway and reducing the oxidation zone width of goaf to 25 m.Through the comprehensive control of gas in upper corner and spontaneous combustion of residual coal in goaf,the safe production of working face is guaranteed.

关 键 词：顶板长钻孔 瓦斯抽采 注氮防火 耦合治理 数值模拟 

分 类 号：TD752[矿业工程—矿井通风与安全]