Yufeng Chang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Ling Shi1, Pei Jia This email address is being protected from spambots. You need JavaScript enabled to view it.2 

1 Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China
2 School of Resources and Safety Engineering, Wuhan Institute of Technology, Wuhan 430073, China

Received: August 31, 2021
Revised: November 21, 2021
Accepted: November 22, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.210199  

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Cite this article:

Chang, Y., Shi, L., Jia, P. (2021). Bipolar Precharger for Hybrid Electrostatic Filtration Systems. Aerosol Air Qual. Res. 21, 210199. https://doi.org/10.4209/aaqr.210199


  • The electrostatic neutralization occurs when the particles are bipolar charged.
  • Bipolar precharger was favorable for turbulence and electrostatic agglomeration.
  • Coagulating fine particles with higher efficiency and lower pressure drop.


Both hybrid electrostatic filtration and agglomeration technologies can effectively improve the efficiency of fine particle collection. A hybrid electrostatic filtration system with a wire-tube bipolar precharger was developed on the basis of bipolar transverse plate electrostatic precipitation technology. Theoretical analyses of electric field and flow field distribution showed that a uniform electric field and high turbulence intensity improve ion migration and particle agglomeration in the novel wire-tube bipolar precharger. The influence of unipolar and bipolar prechargers on dust removal was investigated. In the hybrid electrostatic filtration system with the bipolar precharger, the corona current was 30% higher, the particles deposited on the surface of the filter bag were 19% larger, and the pressure drop was 30% smaller than a filtration system with a unipolar precharger. When silicon powder with a median diameter of 1.7 µm was used, the mean penetration of the experimental device with the bipolar precharger was 45% lower than that of the experimental device with the unipolar precharger.

Keywords: Bipolar agglomeration, Fine particle, Electric field, Collection efficiency

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