Effect of local erosion on flow field and separation performance of α-type cyclone separator

被引：0
|
作者：
Fan J. [1 ]
He H. [1 ]
Zhang P. [1 ]
Chen G. [2 ,3 ]
机构：
[1] College of Electromechanical Engineering, Qingdao University of Science & Technology, Shandong, Qingdao
[2] College of Chemical Engineering, Qingdao University of Science & Technology, Shandong, Qingdao
[3] Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, Shandong, Qingdao
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 08期
关键词：
attrition; numerical simulation; two-phase flow; α-type cyclone separator;
D O I：
10.16085/j.issn.1000-6613.2021-2031
中图分类号：
学科分类号：
摘要：
Flow field and erosion characteristics of α-type cyclone separator were numerically simulated by Reynolds stress model (RSM), particle discrete phase model (DPM) and E/CRC erosion equation based on Eulerian-Lagrangian approach. Effect of local erosion on flow field and separation performance of the equipment was studied by analyzing the distribution rule of velocity vector, tangential velocity and particle trajectory. The results showed that the erosion in the wall opposite to the α-type cyclone separator inlet was the most serious, and the maximum erosion rate was about 1.4×10-5kg/(m2·s). The change of wall geometry caused by erosion led to deflection of airflow direction, which was not conducive to the stability of the main stream and the separation of solid particles. With the intensification of local erosion, the short-circuit flow at the inlet of the vortex finder increased sharply, resulting in a decrease in fluid flow in the area below the inlet of the vortex finder and a decrease in the tangential velocity of the outer vortex. The escape phenomenon of fine particles was more obvious, and the movement trajectory of coarse particles tended to coincide, and it was easier to form a high-concentration ash ring to aggravate the erosion of the wall. Compared with the condition without erosion, when the local erosion thickness was 50mm, the particle separation efficiency of 3μm particles decreased from 74.38% to 54.97%, the cut off diameter increased from 0.73μm to 2.36μm, and the pressure drop of the equipment decreased by about 15.41%. The research results provide a theoretical guidance for industrial application of cyclone separators. © 2022 Chemical Industry Press. All rights reserved.
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页码：4025 / 4034
页数：9
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