可伸缩旋流器流场特性及分离性能研究

Investigation of flow characteristics and separation performance of extensible hydrocyclone

通过构建可伸缩旋流器计算流体动力学(CFD)数值模型,分析等效锥角和套筒层数对流场的影响,确定颗粒在流场中的分布情况以及分离效率的变化.结果表明:当固相体积分数为5%时,可伸缩旋流器对粗颗粒的分离效率达到95%,与常规旋流器持平,溢流提取的细颗粒数量高出常规旋流器5%以上;当固相体积分数增加至20%时,可伸缩旋流器中粗颗粒的分离效率比常规旋流器下降得更为明显,而细颗粒的分离效率则无显著变化.结果表明:改变等效锥角可以实现可伸缩旋流器分离性能的调节;在较低体积分数条件下,可伸缩旋流器具有更好的分离性能;在较高体积分数条件下,可伸缩旋流器须进一步优化.

Based on computational fluid dynamics numerical simulation,the effect of equivalent cone-angle and sub-cylinder number of extensible hydrocyclone was analyzed,and the particle distribution and separation efficiency were obtained.Simulation results show that,in the condition of 5%particle volume fraction,the separation efficiency of coarse particles in extensible hydrocyclone is up to 95%,which is the same to conventional hydrocyclone,and the amount of fine particles from overflow is 5%higher than conventional hydrocyclone.When the particle volume fraction increases to 20%,the separation efficiency of coarse particles in extensible hydrocyclone decreases more obvious than conventional hydrocyclone,while the separation efficiency of fine particles have no significant changes.Research results indicate that the separation performance of extensible hydrocyclone can be regulated by changing the equivalent cone-angle,and a higher separation performance can be obtained in lower particle volume fraction,however,this kind of hydrocyclone need to be further optimized in a higher particle volume fraction.