进料体积分数对旋流分离柱分离性能的影响

基于数值试验系统考察了进料体积分数对旋流分离柱分离性能及颗粒运动行为的影响.结果表明，随着进料体积分数的增加，各粒级在底流中的分配率降低，分离粒度增加，底流夹细现象减弱，但过高的进料体积分数则导致溢流跑粗现象.高的进料体积分数意味着旋流分离柱内颗粒聚集程度增加，随内旋流运动的颗粒量增加.在Z=-400mm平面，颗粒轴向速度随着进料体积分数的增加而增大，向底流口运动的颗粒所需要穿过的内旋流区域增大，粗颗粒被内旋流裹挟的可能性增加.随着进料体积分数的增加颗粒切向速度降低，导致颗粒受到的离心力减小，向内迁移的可能性增大，进一步增加了颗粒在内旋流区域的聚集.

Effect of Feed Concentration on Separation Performance of Cyclone Separation Column

The effects of feed concentration on the separation performance and particle movement behavior of the cyclone separation column were investigated based on numerical experiments. The results show that the increase of feed concentration reduces the recovery of particles in the underflow， increases the cut size， and decreases the misplacement of fine particle in the underflow. However， an excessively high feed concentration results in coarse particles misplaced in overflow. A high feed concentration means that the particle aggregation degree in the cyclone separation column， and the amounts of particles moving with the internal swirling flow increase. The axial velocity of particles increases with the increase of feed concentration on the Z=-400mm plane. The internal swirling flow region that the particles moving towards the spigot need to pass through increases， causing the increase of the possibility of the coarse particles being trapped by the inner swirling flow. The increase of the feed concentration reduces tangential velocity of particles on the Z=-400mm plane， leading to the decrease of centrifugal force on particles and the increase of the possibility of particles migrating inward， further increasing the aggregation of particles in the internal swirling flow region.