Effective collection of ultrafine particles with soft X-ray irradiation under applied electric field and/or corona discharge

Norikazu Namiki, Fumie Yoshikawa, Akihiro Komatsu, Yoshio Otani, Pramod Kulkarni, Pratim Biswas, Yong Shik Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Conventional electrostatic precipitators (ESPs) used for exhaust gas treatment equipment and air cleaners have generally been said to have a penetration window in a submicrometer particle size range. Further, recent works have shown that the collection efficiency of particles with a diameter less than about 50 nm decreases due to poor charging by the corona. In this paper, we describe an attempt to use in situ soft X-ray irradiation to enhance the ultrafine particles in the ESP. A laboratory-scale ESP was configured to irradiate particles with soft X-rays. The collection efficiency of the particles was then measured with and without irradiation to examine the enhancement. The results showed a noticeable improvement in the efficiency of ultrafine particles (dp <60 nm) with irradiation. In particular, X-ray irradiation combined with corona discharge was much more effective than irradiation without it. Further, a higher efficiency was obtained with a positive corona than with a negative one.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalJournal of the IEST
Volume46
DOIs
StatePublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Safety, Risk, Reliability and Quality

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