井下胶运转载点粉尘扩散规律数值研究及应用  

Numerical study and application of dust diffusion law at transfer point of underground belt conveyor transport roadway

作　　者：刘立仁 何生田 陈博 LIU Liren;HE Shengtian;CHEN Bo(Sandaogou Coal Mine,Yulin 719407,Shaanxi,China)

机构地区：[1]三道沟煤矿,陕西榆林719407

出　　处：《矿山机械》2024年第12期16-24,共9页Mining & Processing Equipment

摘　　要：为掌握井下胶运转载点粉尘扩散规律,利用CFD和有限元法,采用κ-ε湍流模型和COMSOL软件,建立了转载点风流-粉尘耦合运移三维数值模型。依据风流速度等值面、压力等值线、等时流线矢量分布和不同粒径粉尘瞬态粒子追踪等模拟结果,分析了井下胶运转载点转运、输送与风流运移方向对巷道风流分布及不同粒径粉尘扩散范围的影响。研究结果表明:输送带巷道转载点处风流受到风流运移交汇和输送物料牵引作用的共同影响,呈复杂的湍流分布状态;当风流方向与物料输送方向相同时,巷道风流速度偏小,粉尘扩散距离有限,易在转载处积聚,导致该范围粉尘质量浓度大于周围巷道;当风流方向与物料输送方向相反时,粉尘容易向下风侧扩散,导致下风侧粉尘质量浓度较高,上风侧质量浓度较低。现场测试的质量粉尘浓度数据与模拟结果较吻合,据此提出了相应的喷雾降尘治理方案,使可吸入粉尘和总粉尘的降尘效率分别达到88.21%和90.22%。In order to understand the dust diffusion law at the transfer point of underground belt conveyor transport roadway,a three-dimensional numerical model of wind flow and dust coupling migration at the transfer point was established by using CFD and finite element method,κ-εturbulence model and COMSOL software.Based on the simulation results of the wind flow velocity contour surface,the pressure contour and the isochronous streamline vector distribution,and the transient particle tracking of different particle size dust,the influence of the transfer and transportation at the transfer point of underground belt conveyor transport roadway and the direction of wind flow migration on the wind flow distribution and the diffusion range of different particle size dust in roadway were analyzed.The results showed that the wind flow at the transfer point of the belt conveyor transport roadway was affected by the wind flow migration and intersection and the traction of the transported material,resulting in a complex turbulent distribution state.When the direction of wind flow was the same as that of material transportation,the wind flow velocity in the roadway was low,and the dust diffusion distance was limited,which made it easy to accumulate at the transfer point,resulting in a higher mass fraction of dust in this range than in the surrounding roadway.When the direction of wind flow was opposite to the direction of material transportation,the dust was easy to diffuse to the downwind side,resulting in a higher mass fraction of dust on the downwind side and a lower mass fraction on the upwind side.The data of the mass fraction of dust measured in the field were in good agreement with the simulation results.Based on this,the corresponding spray dust control scheme was proposed,so that the dust reduction efficiency of inhalable dust and total dust could reach 88.21%and 90.22%respectively.

关 键 词：胶运转载点 粉尘污染 风流分布 数值模拟 COMSOL 

分 类 号：TD714[矿业工程—矿井通风与安全] X964[环境科学与工程—安全科学]