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为了改善露天矿边坡钻机穿孔作业粉尘质量浓度超标的现状,依据气固两相流动及梯度输送理论,对粉尘在风流中运动、扩散及沉降过程进行分析,建立粉尘在空气中的运动、扩散及沉降方程.以某铁矿S03#采场为例,运用计算流体力学的Fluent软件对边坡钻机粉尘质量浓度分布进行数值模拟,并与现场实测数据对比分析,模拟结果与实测数据基本吻合.研究结果表明:采场内粉尘质量浓度沿测点线方向先急剧上升,达到最大值后迅速下降至一个较小值,后逐步缓慢下降;穿孔开始后,粉尘质量浓度随时间推移逐步升高,至一定值时保持恒定.当采场风速为3.5 m·s-1、供气压力为1 MPa、钻孔深度为12 m及钻具转速为84 r·min-1时,粉尘质量浓度较低.
In order to improve the status quo of the dust concentration in the perforation work of open-pit mine rig, according to the gas-solid two-phase flow and gradient transport theory, the movement, diffusion and settling process of dust in the wind flow are analyzed to establish the motion of dust in the air, And subsidence equation.Using an example of S03 # stope in an iron mine, the Fluent software of CFD is used to simulate the dust mass concentration distribution of slope rig and compared with the measured data. The simulation results are in good agreement with the measured data. The results show that: the dust concentration in the stope rises sharply along the line of measuring point before reaching the maximum value, then rapidly decreases to a small value and then gradually decreases slowly. After the perforation starts, the dust concentration gradually increases with time, To a certain value, when the wind speed is 3.5 m · s-1, the pressure is 1 MPa, the drilling depth is 12 m and the drilling speed is 84 r · min-1, the dust concentration is low .