Zhengda Yang This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Hanqing Li2, Qingyi Li3, Riyi Lin This email address is being protected from spambots. You need JavaScript enabled to view it.1, Ye Jiang1, Yang Yang2, Chenghang Zheng2, Deshan Sun4, Xiang Gao2

1 College of New Energy, Qingdao Engineering Research Center of Efficient and Clean Utilization of Fossil Energy, China University of Petroleum (East China), Qingdao 266580, China
2 State Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
3 Zhejiang Energy Group Co., Ltd., Hangzhou 310007, China
4 Shandong Guoshun Group, Jinan 250000, China


Received: July 31, 2020
Revised: October 5, 2020
Accepted: October 12, 2020

 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.2020.07.0475  

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Cite this article:

Yang, Z., Li, H., Li, Q., Lin, R., Jiang, Y., Yang, Y., Zheng, C., Sun, D. and Gao, X. (2020). Correlations between Particle Collection Behaviors and Electrohydrodynamics Flow Characteristics in Electrostatic Precipitators. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.07.0475


HIGHLIGHTS

  • An ESP model considering ionic wind was established.
  • Correlations between particle motion behaviors and EHD flow were investigated.
  • The existence of an escaping window at the ESP inlet was found.
  • Modifying ESP geometry and voltage were possible retrofitting approaches.
 

ABSTRACT 


Electrostatic precipitators (ESPs) are widely used to eliminate particulate matter emissions from industrial sources. However, the complex electrohydrodynamics (EHD) flow in ESPs can cause controversial conclusions on particle collection. This paper established an ESP model with an additional source term added to the equation of gas momentum conservation. Correlations between particle motion behaviors and EHD flow characteristics were investigated regarding various discharge voltage, particle size, and electrode position. Results show that the EHD flow presented a back-and-forth distribution between the electrode and plate. The peak value of vy can be as high as 0.15 m s1. The EHD flow can cause four possible types of particle motion status. The dominant factor for particle motion switched between the electric force and drag force along with the particle motion trajectory. There existed an escaping window at the ESP inlet. Particles released from this window penetrated through the ESP rather than be collected. Modifying the ESP geometry and increasing voltage can narrow the escaping window. When the ESP channel width was narrowed from 0.06 to 0.05 m, the maximum NEHD could increase by 73.4% from 0.94 to 1.63. Consequently, the collection efficiency was significantly improved. The collection efficiency can even amount to 100% for particles sized 2.5 μm.


Keywords: Particulate matter; Electrohydrodynamics flow; Electrostatic precipitator; Electric force; Drag force; Particle collection.




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