重介质浅槽分选机流场及临界分选粒度研究

重介质浅槽分选机广泛应用于动力煤的分选,为了研究浅槽内部流场对分选效果的影响,采用FLUENT软件模拟了W26F54浅槽分选机的内部流场,计算了浅槽不同位置的临界分选粒度。研究结果表明:浅槽内部悬浮液存在涡流和折回流;水平流和上升流的流量比显著影响浅槽内部的速度场、密度场,流量比过大或过小都不利于物料分离或输送,流量比为8∶2时浅槽内速度场和密度场分布较为理想,有利于物料分选和悬浮产物的输运;浅槽不同区域的临界分选粒度不同,随浅槽高度的增加呈先减小后增大的趋势。

Numerical simulation of heavy medium vessel flow field and calculation of critical separation size

Heavy medium vessel is widely used in thermal coal separation.The flow field in the shallow tank significantly affects the separation effect.FLUENT software is used to study the flow field inside the W26 F54 heavy medium vessel,and the critical sorting granularity at different positions of the shallow tank is calculated.The results show that there are eddy currents and reflux in the suspension in shallow tank.The flow ratio of horizontal flow and upwelling flow significantly affects the velocity field and density field in the shallow tank.Too large or too small the flow ratio is not conducive to material separation or transportation.When the flow ratio is 8∶2,the distribution of velocity field and density field in the shallow tank is more ideal,which is beneficial to material separation and transportation of suspended products.The critical separation particle size in different regions of the shallow tank is different,which decreases first and then increases with the increase of shallow tank height.