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Investigation of the Performance of Filtration-charged Particles in a Reversed Electric Field

Category: Control Techniques and Strategy

Volume: 19 | Issue: 12 | Pages: 2879-2887
DOI: 10.4209/aaqr.2019.06.0283
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To cite this article:
Chang, Y., Jia, P., Xiang, X., Shi, L. and Jiang, X. (2019). Investigation of the Performance of Filtration-charged Particles in a Reversed Electric Field. Aerosol Air Qual. Res. 19: 2879-2887. doi: 10.4209/aaqr.2019.06.0283.

Yufeng Chang1, Pei Jia 2, Xiaodong Xiang3, Ling Shi1, Xuepeng Jiang3

  • 1 Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China
  • 2 School of Xingfa Mining Engineering, Wuhan Institute of Technology, Wuhan 430073, China
  • 3 School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

Highlights

  • Filtration-charged particles in a reversed electric field in high face velocity.
  • Higher electric field strength and collection efficiency were achieved.
  • The negative polarity electric field rejected the negative charged particles.
  • Sparking discharge and back corona were eliminated.

Abstract

Electrical forces can be applied to enhance fabric filters’ ability to remove fine particles. To this end, we developed an experimental apparatus consisting of a conventional wire-tube particle precharger and fibrous filters positioned in a generated reversed external electric field. The charging and collection processes were separately accomplished in two stages, and we evaluated the device’s ability to filter filtration-charged particles with a diameter of ≤ 2.5 µm. This device exhibited a higher electric field strength, higher collection efficiency, lower pressure drop, and lower electric potential than conventional devices due to the positioning of the wire and grounded electrodes close to the bag and the repulsion of the charged particles by the reversed electric field. When the face velocity was 2.5 m min–1, the collection efficiency for the charged particles with the reversed electric field was 8.4% and 64.4% higher than the efficiencies for the charged and uncharged particles, respectively, without the field. The charged particles also displayed a pressure drop when the field was applied that was 10% lower and 5% higher than those of the uncharged and charged particles, respectively, when the field was absent. A negative direct current supply was necessary to direct the deposition of the charged particles, and neither a spark discharge nor a back corona was observed while using the reversed-electric-field apparatus, which, according to our results, enables the removal of filtration-charged particles at face velocities beyond the usual range.

Keywords

Filtration Particle precharger Reversed external electric field Collection efficiency


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