羊场湾煤矿综采工作面风速场模拟分析

Wind velocity field simulation analysis of mechanized coal mining face in Yangchangwan Coal Mine

研究采煤工作面风速分布情况,分析风速对CO积聚和煤尘漂移的影响,对综采工作面CO、煤尘防治有重要的意义。以神华宁煤集团羊场湾煤矿130202综采工作面为研究背景,采用Solid Works软件对综采工作面进行了建模,并用flow simulation模块对工作面风速场进行了模拟。模拟结果显示,在综采面回风口综采支架靠近采空区0.5米范围的风速低于0.5 m/s,靠近采空区0.5~1 m范围内风速低于1.5 m/s,局部处于涡流状态,这种涡流使采空区涌出的CO难以进入到主风流中,从而使高浓度CO在上隅角附近循环运动而聚集在涡流区中,形成了上隅角的CO超限。在采煤机端面处横向移动风速最大达到0.35 m/s,风流带动煤尘向综采支架方向漂移,距采煤机前端面距离越远,横向风速越小,对煤尘横向漂移影响也越小。

It has important significance for CO and dust prevention and control of fully mechanized mining face to study the air velocity distribution of mining work face and analyze the effect of wind speed on CO accumulation and coal drift. Taking 130202 fully mechanized coal mining face of Yangchangwan Coal Mine in Shenhua Ningxia Coal Group as the researching background,the fully mechanized coal mining face was modeled with Solid Works software,and the wind speed field on the working face was simulated with flow simulation module.The simulation results showed that the wind speed at the range of 0. 5m of supports at the return air gate in fully mechanized mining face near the goaf is less than 0. 5 m / s,that at the range of 0. 5 ~ 1 m is less than1. 5 m / s,it’s partially in eddy state,which makes the CO gushed from the goaf to enter to the main airflow difficultly,so that CO of high concentration is in circular motion near the upper corner and aggregates in the eddy region,which forms CO over-limit of the upper corner. The wind speed maximum at the end surface of the shearer at lateral movement reaches 0. 35 m / s,airflow drives the coal dust to drift toward fully mechanized supports,the farther the distance away from the front surface of the coal mining machine,the smaller the transverse wind speed,the less influence on the lateral drift of coal dust.