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Characteristics of Charging and Collection of 10-nm-Class Ultrafine Nanoparticles in an Electrostatic Precipitator

전기집진기의 10 nm 급 초미세 나노입자의 하전 및 집진 특성

  • Han, Bang-Woo (Environment Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Kim, Hak-Joon (Environment Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Kim, Yong-Jin (Environment Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Song, Dong-Keun (Environment Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Hong, Won-Seok (Environment Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Shin, Wan-Ho (Environment Systems Research Division, Korea Institute of Machinery and Materials)
  • 한방우 (한국기계연구원 그린환경기계연구본부) ;
  • 김학준 (한국기계연구원 그린환경기계연구본부) ;
  • 김용진 (한국기계연구원 그린환경기계연구본부) ;
  • 송동근 (한국기계연구원 그린환경기계연구본부) ;
  • 홍원석 (한국기계연구원 그린환경기계연구본부) ;
  • 신완호 (한국기계연구원 그린환경기계연구본부)
  • Received : 2011.06.16
  • Accepted : 2011.08.08
  • Published : 2011.10.01

Abstract

The charging of 10-nm-class nanoparticles in an electrostatic precipitator (ESP) according to particle charging ratio has been investigated and compared to the diffusion effect of the nanoparticles. The competition between the charging probability and the diffusion loss effect determines the collection efficiency of nanoparticles in the ESP. The collection efficiency of nanoparticles decreased continuously with decreasing particle diameter. This indicates that the partial charging effect of 10-nm-class nanoparticles is more dominant than their diffusion loss effect in the ESP for nanoparticles in the particle size range of less than 10 nm. The charging ratios based on unipolar diffusion charging calculations were in good agreement with the experimental collection efficiencies for nanoparticles less than 10 nm in diameter.

전기집진에서의 10 nm 급 초미세 나노입자의 하전 및 집진 특성을 파악하였고, 나노입자의 확산효과와 비교해 보았다. 나노입자의 하전율과 확산손실 효과의 지배력에 따라 전기집진기에서의 나노입자 집진효율이 결정되는 것을 확인할 수 있었다. 10nm 급 영역에서는 입자 크기가 작아질수록 지속적으로 집진효율이 감소하였다. 10 nm 이하의 영역에서는 나노입자의 부분적 하전효과가 전기집진기 내의 확산 손실 효과보다 지배적인 것을 알 수 있었다. 10 nm 이하의 나노입자에 대하여 집진효율 실험 결과가 단극 확산 하전 이론을 적용한 입자하전율 계산 결과와도 잘 일치하였다.

Keywords

References

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