Zhengda Yang1,2, Hongbo Qiu3, Can Zhou1, Ye Jiang2, Riyi Lin2, Yang Yang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Chenghang Zheng1, Xiang Gao1 

1 State Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
2 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
3 Shandong Guoshun Construction Group Co., Ltd., Jinan 250000, China


Received: August 20, 2021
Revised: September 30, 2021
Accepted: October 6, 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.210209  

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Cite this article:

Yang, Z., Qiu, H., Zhou, C., Jiang, Y., Lin, R., Yang, Y., Zheng, C., Gao, X. (2021). Developing a Compact Particle Collector by Integrating a Wet Electrostatic Precipitator and an Inertia Mist Eliminator. Aerosol Air Qual. Res. 21, 210209. https://doi.org/10.4209/aaqr.210209


HIGHLIGHTS

  • A compact particle collector was developed by integrating a WESP and an IME.
  • Charges carried by the escaping particles acted as a bridge between the WESP and IME.
  • The optimum design 6-wire WESP enhanced by one-stage IME was the optimum combination.
  • The collector is beneficial for retrofitting air pollution control devices in limited space.
 

ABSTRACT


Wet electrostatic precipitator (WESP) is a reliable alternative to realize the ultra-low emission of particulate matter from coal-fired power plants. This work proposes to develop a compact particle collector by integrating a WESP and an inertia mist eliminator (IME). The particle collection efficiency and charging characteristics of the WESP were analyzed to determine the potential for compact design. Results show that the WESP was easy to achieve a collection efficiency of 95% for both pin and wire electrodes. Particle charging can still be guaranteed with short WESP length and high voltage, indicating the particle charging was sensitive to electrical parameters. Charges carried by the escaping particles acted as a bridge between the WESP and the IME. The collision enhanced by particle charging can lead to an improvement in overall efficiency and charge loss. The particle charge loss of the particle sized 7.29 μm was 22.6% and 29.4% for the one and two stage IME, which coincided with the efficiency enhancement of WESP. The collection efficiency significantly decreased as the WESP size decreased, but the collection efficiency can be enhanced by the combination with IME. The 6-wire WESP enhanced by one-stage IME can be considered the optimal combination because the WESP size can be shorten by 40% while maintaining a similar efficiency. The research findings are beneficial for the retrofit of air pollution control devices in limited space.


Keywords: Particulate matter, Ultra-low emission, Wet electrostatic precipitator, Mist eliminator, Device retrofit




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