PENG Tao^a, DING Xinyue^a, LIU Xuedong^a,b, JIANG Wei^a, GU Yutong^a, LIU Meihua^a, ZHU Zirui^a

(a. School of Mechanical Engineering and Rail Transit; b. Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou 213164, China)

Abstract: In order to investigate the back-blowing filtration characteristics of particles inside the metal fiber filter, three-dimensional reconstruction of the metal fiber filter was carried out according to the microscopic morphology and arrangement mode of the inner fiber obtained by scanning electron microscopy (SEM)and the initial dust removal model was established according to its factory parameters.CFD-DEM co-simulation method was used to simulate the particle back-blowing process inside the metal fiber filter. The influence of back blowing pressure and back blowing time on the effect of dust removal was studied and the distribution of particles in the filter screen before and after back blowing was discussed. The results show that the cleaning efficiency increases with the increase of the back-blowing pressure, and its growth rate has a significant marginal decreasing effect with the increase of the back-blowing pressure. Before the back-blowing,the particles are mainly concentrated near the surface of filter screen. After back-blowing, more than 94% of particles are blown away within 0.10 mm from the surface of filter screen.With the increase of the back-blowing time, the cleaning efficiency will increase first and then remain stable, the back-blowing time will only affect the cleaning effect of the fiber filter within a certain range. The higher the back-blowing pressure is, the shorter the back-blowing time is required to reach the equilibrium cleaning efficiency. For the metal filter screen with porosity of 74.8% and dust holding capacity of 3.85 mg/cm2, the cleaning effect is the best when the back-blowing pressure is 1 900 Pa and the back-blowing time is 80 ms.

Keywords: metal fiber filter; back-blowing pressure; back-blowing time; dust removal; CFD-DEM co-simulation

中图分类号：TQ545

文献标志码：A

文章编号：1008-5548(2021)04-0084-09

DOI:10.13732/j.issn.1008-5548.2021.04.011

收稿日期： 2020-12-18， 修回日期：2021-03-25，在线出版时间：2021-06-03 15:06。

基金项目：中国石油化工集团公司重点研发计划，编号：418020-4。

第一作者简介：彭涛(1996—)，男，硕士研究生，研究方向为环保设备及技术。E-mail： 2578266196@qq.com。

通信作者简介：刘雪东(1965—)，男，教授，硕士生导师，研究方向为化工装备结构创新与优化、粉体工程设备与技术。E-mail： xdliu_65@126.com。