基于CFD数值模拟分析综掘工作面粉尘迁移规律研究

Analysis on dust migration on heading face based on CFD numerical simulation

针对目前综掘工作面产尘量大、空间狭小、粉尘浓度高、降尘难度大的问题,基于CFD离散相解算模拟技术,通过建立全尺寸掘进面巷道模型,对比研究在压入式通风条件下割上部与下部煤(岩)时,粉尘在掘进巷道的纵向与横向运移规律。掘进头模拟结果显示,在掘进头风流场中有两处涡流区域,一处位于掘进机前、中部,一处位于掘进机右侧后部。涡流的卷吸作用会导致这两处有明显的粉尘聚集,非常靠近掘进司机的位置,影响范围分别近似为1m×3m与0.8m×1.5m的矩形区域,最高浓度约为500mg/m3。同时还研究了通风量对风流场涡流区域粉尘聚集区域的影响,对比发现增大通风量可有效减小粉尘聚集区域的浓度。

In the case of such problems as narrow space, high dust production, high dust concentration and difficulty in dust suppression on heading face, the model for the full-size driving face in the roadway was established, based on the CFD discrete phase solution simulation technique. And the dust migration rules in horizontal and vertical directions were investigated in contrast when cutting the upper and the lower coal parts under the pressurizing ventilation condi- tion. The simulation results of tunnelling place showed that there existed two vortex zones in airflowing field, one in the front and central part of roadheader, and the other in the rightback of roadheader. In addition, the entrainment effect of vortex led to significant dust aggregation in these zones, next to the driver, with a active area of 1 m × 3 m and 0.8 m × 1.5 m, and the highest concentration of 500 mg/m3. Besides, the effects of ventilation quantity on dust aggregation in vortex zone of air-flowing field were studied at the same time. The contrast results showed that increasing ventilation quantity effectively reduced the dust concentration.