停采撤架期间两道封堵下采空区气热场数值模拟研究

Numerical Simulation of Gas and Heat Field in Goaf Under Two Blocked Paths During Stop-mining and Removal

本文以百贯沟煤矿2506工作面为研究对象建立采空区数值模型,采用数值模拟方法研究停采撤架期间两道封堵对采空区气热场变化的影响。结果表明:两道封堵后,采空区进风侧氧气体积分数大幅度下降,回风侧氧气体积分数在靠近工作面处有一定程度增加,但在离工作面20m后快速降低至低于封堵前的氧气体积分数;采空区自燃危险区域向工作面靠近,自燃危险区域面积减小,减小幅度为37%;采空区内最高温度降低,高温区域向回风侧移动,CO体积分数下降,流场收缩向工作面靠近且集中分布在采空区中部。

In this paper,a numerical model of the mining area was established at the 2506 working face of Baigangou coal mine,and numerical simulation was used to study the effect of two blocking passes on the change of the aerothermal field in the mining area during the suspension and withdrawal of the frame.The results show that after the two blocking,the oxygen concentration in the inlet side of the mining area decreases significantly,and the oxygen concentration in the return side increases to a certain extent near the working face,but decreases rapidly to lower than the oxygen concentration before the blocking after 20 m from the working face;the spontaneous combustion danger area in the mining area moves closer to the working face,and the area of the spontaneous combustion danger area decreases by 37%;the maximum temperature in the mining area decreases,and the high temperature area moves to the return side.The highest temperature in the mining area decreases,the high temperature area moves to the return wind side,the CO concentration decreases,the flow field contraction is close to the working face and is concentrated in the middle of the mining area.