CAJ | 학술논문

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.
위료개선로천광변파찬궤천공작업분진질량농도초표적현상，의거기고량상류동급제도수송이론，대분진재풍류중운동、확산급침강과정진행분석，건립분진재공기중적운동、확산급침강방정.이모철광S03#채장위례，운용계산류체역학적Fluent연건대변파찬궤분진질량농도분포진행수치모의，병여현장실측수거대비분석，모의결과여실측수거기본문합.연구결과표명：채장내분진질량농도연측점선방향선급극상승，체도최대치후신속하강지일개교소치，후축보완만하강；천공개시후，분진질량농도수시간추이축보승고，지일정치시보지항정.당채장풍속위3.5 m·s-1、공기압력위1 MPa、찬공심도위12 m급찬구전속위84 r·min-1시，분진질량농도교저.
ABSTRACT To improve the situation of dust concentration exceeding during side slope drilling in an open-pit mine, according to the theories of gas-solid two-phase flow and gradient transportation, the dust movement, diffusion and sedimentation equations were established based on the analysis of dust movement, diffusion and sedimentation characteristics in the air. Taking S03# slope of an iron mine as an example, the Fluent software for computational fluid mechanics was used for numerical simulation of dust concentration distribution during side slope drilling. In contrast to field measured data, the simulation result almost conforms to the measured data. The research result shows that the dust concentration firstly increases sharply and reaches a maximum value with increasing distance from the drilling position. After that, it decreases quickly to a lower value and then gradually decreases. What is more, when the drill-ing begins, the dust concentration keeps on rise until a certain value and remains during the whole drilling process. Meanwhile, the dust concentration achieves its minimum value at a wind speed of 3.5 m·s-1 , an air pressure of 1 MPa, a drilling depth of 12 m, and a drilling speed of 84 r·min-1 .