综采工作面煤尘扩散规律的研究

Study on Coal Dust Diffusion Laws at Fully Mechanized Coal Mining Face

采用CFD离散相物理模型对采煤工作面不同割煤方式煤尘扩散进行模拟,对模型中5条代表性直线进行煤尘浓度检测,得出具有普遍试用的一般性煤尘扩散规律。发现顺风割煤时煤尘水平方向扩散速度快,但局限于采煤工作面底部范围,中心线浓度在煤机后10~15 m达到峰值;逆风割煤时煤尘垂直方向扩散速度快,中心线浓度在煤机后5~10 m达到峰值,并且煤尘浓度峰值高于顺风割煤煤尘浓度峰值。2种割煤方式煤尘浓度在煤机后40~50 m处在水平方向达到基本稳定,垂直方向煤尘底板浓度高于顶板浓度。

We adopted CFD discrete phase physical mode to simulate the diffusion of coal dust generated in different cutting coal ways, and measured coal dust concentration for five typical straight lines in the model to draw a universal trial general diffusion law. Coal dust generated in downwind cutting coal way, the diffused speed in horizontal direction was fast, but limited the bottom scope of coal face. The peak concentration of center line appeared in the rear of the stoker 10 m to 15 m, Coal dust generated in upwind cutting coal way, the diffused speed in the vertical direction was fast. The peak concentration of center line appeared in the rear of the stoker 5 m to 10 m and higher than the peak concentration of coal dust generated in downwind cutting coal way. The coal dust concentration of different cutting coal ways reached stable in the rear of the stoker 40 m to 50 m in horizontal di- rection, and the concentration of coal dust at the bottom was higher than that at the top.