综掘工作面压风分流控除尘技术研究与应用

为解决综掘工作面粉尘污染问题，掌握工作面长压通风分流控尘与短抽除尘参数最佳匹配关系，实现最大程度降低工作面粉尘浓度。本文以王家岭煤矿高产尘综掘工作面为研究背景，通过建立CFD计算模型，对比研究综掘工作面不同轴径向出风比的控尘效果，得到有效控尘参数范围，再结合现场实际应用进行验证分析，以此得到最佳控除尘工艺匹配参数。研究结果表明:在增加附壁风筒控尘后，在掘进机尾部形成沿巷道壁螺旋前进的新鲜风流透明风墙，能够将粉尘控制在工作面前部区域;在轴径向出风比为1∶3时，粉尘被控制在前部4 m范围内较小区域，并能满足掘进工作面最低风速要求，对掘进工作面前部粉尘控制作用明显。通过现场对比应用，当轴径向出风比为1∶3时，控降尘效果最佳，司机位置与掘进机尾5 m的总粉尘和呼吸性粉尘浓度可分别降低到26.1 mg/m3和12.7 mg/m3以内，其中控尘效率达到80%以上，总体控降尘效率达93%以上，降尘效果明显，有效缓解综掘工作面粉尘污染，减少了职业危害。

Research and application of the technology of forced ventilation diversion to control and reduce dust in fully mechanized excavation face

In order to solve the problem of dust pollution in fully mechanized heading face,understand the best relationship between the long forced ventilation and the short dust removal sucking in the heading face,and reduce the dust concentration at heading face to the maximum degree,this paper investigated the high dust yield heading face in Wangjialing coal mine.By establishing CFD calculation model,the effect of dust control of different axial and radial air ratio at fully mechanized heading face is compared,and the parameters range of effective dust control is obtained.The actual field application is verified in order to get the best matching parameters for the process of dust control and removal.The results show that after increasing the air duct along the heading wall for dust control,a fresh air flow transparent wall along the heading wall is formed at the tail of roadheader.Thus,the dust can be controlled in the front of heading face.When the ratio of the axial and radial air is 1∶3,the dust is controlled in the smaller area within 4 m range,and can meet the requirements of minimum wind speed in heading face,and the dust can be controlled in the front of heading face.The field application shows that when the ratio of the axial and radial air is 1∶3,the dust control effect is best.The total dust and respirable dust concentration at the driver’s position and the 5 m position at the tail of driving machine can be reduced to less than 26.1 mg/m3 and 12.7 mg/m3.The dust control efficiency is above 80%,the overall dust efficiency is up to 94%,and the dust reduction effect is obvious.The dust pollution at fully mechanized heading face is effectively mitigated,and the occupational hazards to miners are reduced.