双入口旋风分离器速度流场及分离效率数值模拟研究

Numerical Simulation Study on Velocity Flow Field and Separation Efficiency of Double Inlet Cyclone Separator

摘要: 为了探究双切向入口旋风分离器气相流场特性以及气液分离效率，本文采用数值模拟的研究方法，使用CAD技术模拟了双切向入口旋风分离器速度流场分布以及粒径大小对分离效率影响规律。研究发现：速度流场在尾端的分布相较于单入口旋风分离器，“摆尾”现象减弱，且呈现良好的对称性；外部自由涡速度以较大速度向下运动，最大可达9.4 m/s，内部强制涡先以2 m/s速度向上运动，到达溢流口附件速度发生突变，达到入口速度的两倍以上；在本文研究的小型分离器结构尺寸下，对于小粒径液滴的分离效果远不如大粒径液滴，且临界分离粒径的大小在1~3 um之间。

Abstract: In order to explore the internal flow field characteristics and gas-liquid separation efficiency of double tangential inlet cyclone, this paper adopts the research method of numerical simulation, and uses CAD technology to simulate the velocity field distribution of double tangential inlet cyclone and the influence law of particle size on separation efficiency. The study found that: compared with the single inlet cyclone separator, the “wiggling tail” phenomenon was weakened and the distribution of velocity field at the tail end showed good symmetry; the velocity of the external free vortex moved downward with a large velocity, up to 9.4 m/s, and the internal forced vortex moved upward with a velocity of 2 m/s, and the velocity of the overflow port annex changed abruptly, reaching more than twice the inlet velocity; under the structure size of the small separator studied in this paper, the separation effect of small particle size droplets was far less than that of large particle size droplets, and the critical separation particle size was between 1~3 um.