综采工作面粉尘分布规律及防尘措施研究

Study on dust distribution and dust prevention measures in fully mechanized coal face

为了得到综采工作面粉尘的分布规律,分别通过数值模拟和现场实测的方法研究采煤机截割粉尘和工作面沿程粉尘的分布情况。结果表明:采煤机顺风割煤时,沿风流方向从后滚筒至前滚筒区域,粉尘浓度不断升高,风流引起的扩散对粉尘浓度的增加作用明显;采煤机逆风割煤时,沿程粉尘浓度总体呈升高趋势,产尘源区粉尘浓度变化较快,滚筒自身产尘对工作面粉尘污染起主导作用;溜槽与支架人行道内粉尘浓度变化趋势基本相同,但后者相对滞后,且粉尘浓度相对较低;因此,采取防尘措施时,顺风割煤应着重考虑风流的影响而逆风割煤主要针对滚筒的自身产尘,但无论何种条件下截割产尘都是工作面粉尘的主要根源。

In order to obtain the dust distribution law in the fully mechanized coal face,the distribution of shearer cutting dust and the dust along the working face was studied by numerical simulation and field measurement respectively.The results show that when the shearer cuts coal downwind,along the direction of the air flow from the rear drum to the front drum area,the dust concentration keeps rising,and the diffusion caused by the air flow has an obvious effect on the increase of dust concentration.When the shearer cuts coal upwind,the dust concentration along the road shows an increasing trend,and the dust concentration in the dust source area changes rapidly.The dust produced by the drum plays a leading role in the dust pollution of the working face.The change trend of dust concentration in the groove of scraper conveying machine is basically the same as that in the support walkway,but the latter lags behind relatively,and the dust concentration is relatively low.Therefore,when taking measures to prevent dust,downwind coal cutting should focus on the influence of air flow,while upwind coal cutting is mainly aimed at the dust production of the drum itself,but under any conditions,cutting dust production is the main source of dust on the working face.