胶带输送巷粉尘分布规律数值模拟研究

Research on numerical simulation of dust distribution in belt conveyer lane

为了掌握粉尘在胶带输送巷道内的分布及运移规律,确定影响粉尘分布的关键因素,选取某矿井胶带输送机大巷包含转载点节段为研究对象,建立巷道及胶带输送机三维实体模型,根据气固两相流理论,运用DPM模型,对不同边界条件下的粉尘分布运移规律进行数值模拟研究。结果表明,胶带输送机的运行速度、巷道平均风速以及转载点的存在都对粉尘分布产生影响。其中,带速的提高会导致巷道沿程粉尘浓度升高,在带速为3.5 m/s时,人行道中线与巷道中线最高粉尘浓度分别达到27.5 mg/m^3与150 mg/m^3;转载点的存在会使其后方粉尘浓度上升速率变大;适当提高巷道平均风速有利于降低沿程粉尘浓度,风速为5 m/s时,人行道中线与巷道中线最高粉尘浓度分别降为7.5 mg/m^3和40 mg/m^3。

In order to grasp the distribution and migration rules of dust in the belt conveyor tunnel and to determine the key factors that affect the dust distribution, selecting the section of conveyor belt conveyor belt in the mine as the research object, the three-dimensional solid model of roadway and belt conveyor is estab- lished. According to the theory of gas-solid two-phase flow, the DPM model is used to study the numerical simulation of dust distribution in different boundary conditions. The results show that the belt conveyor speed, the average wind speed of the roadway and the existence of transfer point have an impact on the dust distribution. Among them, the inerease of belt speed leads to the increase of dust concentration along the roadway. When the belt speed is 3.5 m/s, the maximum dust concentration in the middle lane of the sidewalk and lane-way reaches 27.5 mg/m^3 and 150 mg/m^3 respectively; The dust concentration in the rear of the roadway will increase at a higher rate. The appropriate increase of the average wind velocity in the roadway will reduce the dust concentration along the roadway. When the wind speed is 5m/s, the maximum dust concentration in the midline of the sidewalk and laneway will be reduced to 7.5mg/m^3 and 40mg/m^3.