Zelong Liao1, Yuheng Li1, Xiangsheng Xiao1, Chen Wang1, Shang Cao1, Yong Yang 1,2

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical Engineering and Electronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China

Received: August 4, 2017
Revised: November 14, 2017
Accepted: December 27, 2017
Download Citation: ||https://doi.org/10.4209/aaqr.2017.08.0261 

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Cite this article:
Liao, Z., Li, Y., Xiao, X., Wang, C., Cao, S. and Yang, Y. (2018). Electrostatic Precipitation of Submicron Particles with an Enhanced Unipolar Pre-Charger. Aerosol Air Qual. Res. 18: 1141-1147. https://doi.org/10.4209/aaqr.2017.08.0261


  • Two-stage ESP was developed using a simple unipolar pre-charger.
  • The enhancement of particle charging at submicron range was studied.
  • The electrical and particle collection performance was evaluated.


A two-stage electrostatic precipitator (ESP) has been developed using an enhanced unipolar pre-charger with dielectric coated ground electrodes. The electrical and particle collection performance was evaluated for particles in the submicron range. By varying the voltage applied to the pre-charger, the particle charging characteristics was compared with that calculated by the theoretical model. The experimental results show that with the adoption of the pre-charger, the charging of the particles at submicron range was enhanced. Further results indicate that the collection efficiency can be improved by about 12.1%–15.9%, compared with the results obtained without the pre-charger. Higher particle collection efficiency can be achieved by increasing the voltage applied to the pre-charger. The unipolar pre-charger studied in this paper proves to be a simple and useful device to improve the submicron particle collection efficiency of conventional ESPs.

Keywords: Unipolar pre-charger; Electrostatic precipitator; Particulate matter; Corona discharge; Submicron particle.


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