短臂大采高综放工作面注氮防灭火工艺

Nitrogen Injection and Fire Prevention Technology for Short Arm High Mining Height Fully Mechanized Caving Face

摘要: 为了确定乌东煤矿工作面合理的注氮流量、注氮管路间距和采空区起始注氮深度等重要注氮工艺参数,通过在工作面回风侧布置束管监测系统,连续监测回风侧采空区O2浓度变化规律,研究工作面在不同注氮流量、注氮管路间距条件下的采空区自燃“三带”分布规律。研究结果表明:乌东煤矿短臂大采高综放工作面合理注氮流量为 259~622 m³/h,采空区全断面注氮管路间距为 20~40 m,开始注氮位置在架后 15 m。

Abstract: To determine the important nitrogen injection process parameters, such as the reasonable nitrogen injection flow rate, the nitrogen injection pipeline spacing and the initial nitrogen injection depth in the goaf, the beam monitoring system is continuously monitored on the return air side of the working face to monitor the variation laws of O₂ concentration in the goaf of the return air side, and study the distribution law of spontaneous combustion “three belts” in the goaf under different conditions of nitrogen injection flow and nitrogen injection pipeline spacing. The results show that the reasonable nitrogen injection flow rate of the short-arm high-level fully mechanized caving face in Wudong Coal Mine is 259 m³/h to 622 m³/h, and the distance between the full-section nitrogen injection pipelines in the goaf is 20 m to 40 m, and the initial nitrogen injection position is 15 m behind the shelf.