颗粒粉尘在水平管道内运移的三维数值模拟

3D simulation on transporting of particle dust in horizontal duct

矿山粉尘治理需通过选择合理的除尘方法,才能达到较好的降尘效果;目前,带有长管道的机械通风除尘措施是矿山粉尘治理的有效措施之一。随着粉尘在管道内长时间排出,管道内势必会产生沉积现象。应用计算流体力学软件FLUENT 6.3.26对不同粒径的二氧化硅粉尘颗粒在水平通风管道内的沉积规律进行模拟计算,其中通风管道管径D=500mm,长度l=20 m,送风速度v=12 m·s^(-1)。模拟结果表明:微颗粒(100μm)在管道内停留时间较短,最长时间为3.91 s,受湍流影响较大,沉降现象不明显,运移规律呈无序状;粗颗粒(5~10 mm)在管道内停留时间相比微颗粒粉尘,停留时间较短,最长时间为1.71 s,受湍流影响较小,沉降现象明显,运移规律呈波浪状循环上升降落,波峰高度随管程增大而逐渐降低。

Mine dust control need to choose the reasonable way to deal with,in order to achieve the better effect of dust-removal; At present,mechanical ventilation and dust removal measures with long pipes is one of the effective measures for mine dust-removal.As the dust discharge for a long time in the pipe,the pipe will inevitably produce deposition.Applying FLUENT 6.3.26 CFD code,particles depositon law was simulated on different particle size of silica dust particles in the horizontal ventilation pipe that pipe diameter D is 500 mm,pipe length l is20 m and air apply velocity v is 12 m·s^-1.The simulation results showed that the residence time of micro-particle （100 μm） in the pipeline was short,the longest time was 3.91 s,the influence of turbulence was large,sedimentation phenomenon was not obvious,the law of migration was disorder; the residence of coarse particle （5 to 10 mm） in the pipe is shorter,the maximum residence time was 1.71 s,the influence of turbulence was small,the sedimentation was obvious,the law of migration was wavy cycling to rise and fall and the height of wave decreased with the increase of pipe length.