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Collection Enhancement Mechanism and Test of Side Flow Electrostatic Precipitation

Category: Control Techniques and Strategy

Volume: 20 | Issue: 4 | Pages: 844-851
DOI: 10.4209/aaqr.2019.09.0454
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To cite this article:
Xiang, X., Jia, S., Chang, Y. and Shi, L. (2020). Collection Enhancement Mechanism and Test of Side Flow Electrostatic Precipitation. Aerosol Air Qual. Res. 20: 844-851. doi: 10.4209/aaqr.2019.09.0454.

Xiaodong Xiang1,2, Siyang Jia 3, Yufeng Chang4, Ling Shi4

  • 1 School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
  • 2 Green Manufacturing Engineering Institute, Wuhan University of Science and Technology, Wuhan 430081, China
  • 3 Hubei Provincial Industrial Safety Engineering Technology Research Center, Wuhan University of Science and Technology, Wuhan 430081, China
  • 4 Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Janghan University, Wuhan 430056, China

Highlights

  • A side flow ESP is proposed to provide a method of conventional ESP upgrade.
  • Gas velocity in side flow ESP can be greatly reduced with gas flow unchanging.
  • Dust collection efficiency of side flow ESP is better than that of conventional ESP.

Abstract

The collection efficiency of many electrostatic precipitators (ESPs) must be improved in order to fulfill the particulate emission standard, which has become increasingly rigorous. According to classical collection theory, decreasing the gas velocity for an electric field is one of the most effective methods of enhancing the collection efficiency. Thus, we proposed a side-flow ESP, which, compared to its conventional counterpart, requires a far lower gas velocity for the electric field when the gas flow rate is constant. First, using aerodynamics, a theoretical expression of the collection efficiency and dust re-entrainment lift force was derived for a turbulent flow. The calculations indicated that a greater increase in efficiency was achieved by decreasing the gas velocity, which potentially reduces dust re-entrainment, than by lengthening the electric field. To confirm the advantages of the side-flow ESP, the collection efficiency and dust re-entrainment were measured in comparison experiments with a conventional ESP, in which talc powder with a medium diameter of 11.6 µm was used as the test dust. The dust concentration at the inlet averaged ~1400 mg m–3, and the strength of the electric field ranged approximately from 3 to 4 kV cm–1. The experimental results indicated that the emitted concentration and the dust re-entrainment were 45% and 42% lower, respectively, for the side-flow ESP than for the conventional ESP at the same gas flow rate.

Keywords

Electrostatic precipitator (ESP) Collection efficiency Particle penetration Dust re-entrainment


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