综掘面尘源动态变化下粉尘场优化的风流调控研究

Wind flow control for optimization of dust field distribution under dynamic change of dust source in fully mechanized heading face

针对综掘面风流状态不能实时动态变化及粉尘源位置不断移动导致巷道粉尘聚集严重等问题,设计了风流调控下粉尘场模拟的正交试验方案,采用FLUENT软件模拟分析了尘源动态变化下风流调控参数对粉尘浓度分布影响规律,并运用极差分析法分析了风筒出风口口径、水平偏转角度、垂直偏转角度三个影响因素的显著性,确定了粉尘场优化分布的风流调控方案。对柠条塔矿S1212胶运巷道出风口距迎头5m和10m时的风流调控进行实际测试得出:回风侧行人呼吸带高度平均粉尘浓度分别降低33.4%和34.3%,掘进司机处粉尘浓度分别降低45.3%和40.4%,结果表明,根据实际需求建立出风口风流调控方案,对出风口风流状态进行调控可以优化粉尘场分布,降低粉尘浓度,改善通风环境。

In view of the airflow state of fully mechanized face can not change dynamically in real time and the dust source is moving continuously,which leads to serious dust accumulation in roadway,the orthogonal test scheme of dust field simulation under airflow control is designed. The influence of airflow control parameters on dust concentration distribution under dynamic change of dust source is analyzed by FLUENT simulation,and the significance of the influence factors of the air outlet diameter,the horizontal deflection angle and the vertical deflection angle of the air duct is analyzed by the range analysis method. The air flow control scheme of the optimal distribution of the dust field is determined. The actual test of air flow control at 5 m and 10 m from the outlet of S1212 rubber transportation roadway in Ningtiaota Mine shows that the average dust concentration of pedestrian breathing zone height on return side is reduced by 33. 4% and 34. 3%,and the dust concentration at driving driver is reduced by 45. 3% and 40. 4%,respectively. The results show that the air flow control scheme of outlet air outlet can be established according to the actual demand. Regulating the outlet airflow state can optimize the distribution of dust field,reduce dust concentration and improve ventilation environment.