Experimental and theoretical studies of ultra-fine particle behavior in electrostatic precipitators

Ye Zhuang, Yong Jin Kim, Tai Gyu Lee, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

A cylindrical electrostatic precipitator (ESP) was used to investigate the applied voltage versus corona current characteristics and ultra-fine particle (diameter <0.1 μm) capture under controlled conditions. Corona currents were measured under various applied voltages for a one- and two-stage mode of operation. The corona current was observed to decrease at the higher gas velocities because fewer ions reached the collector surface. The presence of the particles (NaCl and Al2O3) in the ESP resulted in a decrease in the corona current due to a reduction in ion emissions. Collection efficiencies were measured under various operating conditions and it was found that lower electrical resistivity of particles resulted in the decrease of collection efficiency because of reduced attractive force at collector surfaces after deposition. A decrease in collection efficiency was observed (both in a one- and two-stage ESP for different kinds of particles, NaCl, Al2O3, and SiO2) with the reduction in particle size below 0.1 μm. A statistical approach for particle-charging process, which assigns discrete charge levels to particles with the same size, in conjunction with the transport equation was used to support the experimental observations. This approach of fractional charging was more accurate than an assumption of uniform particle charging.

Original languageEnglish (US)
Pages (from-to)245-260
Number of pages16
JournalJournal of Electrostatics
Volume48
Issue number3-4
DOIs
StatePublished - Mar 2000
Externally publishedYes

Keywords

  • Aerosol charging
  • Collection efficiency
  • Combustion
  • Corona current
  • Electrostatic precipitator
  • Reentrainment
  • Submicrometer aerosols
  • Ultrafine particles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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