Y型通风采空区漏风规律数值模拟研究

Numerical simulation study on air leakage law in goaf of Y-type ventilation

针对采空区内遗煤自燃和工作面上隅角瓦斯超限等问题,探究沿空留巷条件下Y型通风采空区的漏风规律。以雨汪煤矿1010201工作面为工程背景,结合Fluent数值模拟软件,对采空区的三维空隙率进行UDF设置,模拟采空区的漏风流场、各组分气体浓度以及自燃“三带”分布规律,对其结果进行对比处理分析。结果表明:采空区漏风主要集中在工作面上、下隅角前50 m范围;采空区内氧气浓度与距工作面以及沿空留巷的距离相关,距离越近浓度越高。

Aiming at the problems of spontaneous combustion of coal in the goaf and corner gas overrun on the working face,the air leakage law of the Y-shaped ventilation goaf under the condition of empty alley is explored.Taking the 1010201 working face of Yuwang coal mine as the engineering background,combined with Fluent numerical simulation software,the three-dimensional void ratio of the goaf is set UDF,and the air leakage flow field,gas concentration of each component and spontaneous combustion"three zones"in the goaf are simulated,and the results are compared and analyzed.The results show that the air leakage in the goaf area is mainly concentrated in the upper and lower corner 50m range.The oxygen concentration in the goaf is related to the distance from the working face and along the empty lane,and the closer the distance,the higher the concentration.