安全高效高瓦斯工作面下行通风技术研究与应用

Research and Application of Downward Ventilation Technology for Safe and Efficient Working Face with High Gas Content

为解决上行通风引起的上隅角瓦斯积聚及采空区抽采管路无法回收等技术难题,将采煤工作面通风方式改为下行通风方式。采用数值模拟的方法,分别对保德煤矿回采工作面采用上行、下行通风方式的采空区瓦斯分布规律进行模拟,确定了下行通风技术参数,并在保德煤矿81505工作面试验采用下行通风方式。结果表明:应用下行通风方式解决了回风隅角瓦斯积聚问题,实现了采空区主要抽采管路的安全回收,解决了采空区遗留金属管路的安全隐患,且工作面巷道优化布置后可减少掘进一条巷道,单个采煤工作面同比节约成本超过5 000万元。

In order to solve the technical problems such as gas accumulation in upper corner caused by upward ventilation and unrecoverable extraction pipe in goaf, it is proposed that the coal mining face adopts downward ventilation. By means of numerical simulation, the gas distribution laws in goaf with upward and downard ventilation methods on the stope face of Baode Coal Mine were simulated respectively. The technical parameters of downward ventilation were determined, and the downward ventilation method was adopted in 81505 working face of Baode Coal Mine. The practical results show that the downward ventilation method solves the problem of gas accumulation in the return air corner, realizes the safe recovery of the main extraction pipeline in goaf, solves the safety hazard of the remaining metal pipeline in the goaf, optimizes the roadway layout and lessens a roadway. The comprehensive economic benefit of single coal mining face exceeds 50 million yuan.