title: Effect of temperature on carbon nanoparticle collection efficiency using photoelectric ESP.
abstract: The electrostatic precipitator (ESP) technique is a promising method for enhancing the particulate matter (PM) emission reduction efficiency of diesel engines, and is much better than the diesel particulate filter (DPF) technique. However, the ESP's low efficiency in collecting PM with diameters less than several tens of nanometers remains a problem because the particle charging efficiency decreases as the size of the nanoparticles decreases. To improve the collection efficiency of nanosized PM, we used a photoelectric charger to increase the charging efficiency of nanoparticles ahead of the ESP system. Carbon nanoparticles produced using a spark discharge generator were used to evaluate the collection efficiency of the combined photoelectric charger and ESP system. The particle sizes were measured using a scanning mobility particle sizer system at various experimental temperatures similar to the temperature of DPF systems commonly used in diesel engines. We succeeded in obtaining improved collection efficiencies at increased inner temperatures of the photoelectric charging chamber. As the temperature increased from 694 degrees C to 839 degrees C at the inlet of the photoelectric chamber, the efficiency of PM collection improved significantly to 28.5% for a particle diameter of 18.4 nm.
authors.affiliation: Aerosol and Particle Technology Laboratory, School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Woojin
authors.initials: W
authors.lastname: Kim
authors.forename: Jae Hee
authors.initials: JH
authors.lastname: Jung
authors.forename: Dong Keun
authors.initials: DK
authors.lastname: Song
authors.forename: Hakjoon
authors.initials: H
authors.lastname: Kim
authors.forename: Yong Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Kim
mesh_terms: D000393:Air Pollutants / Q000302:isolation & purification*; D002244:Carbon / Q000032:analysis*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D053758:Nanoparticles / Q000032:analysis*; D010316:Particle Size; D055672:Static Electricity; D013696:Temperature
chemical_list: D000393:Air Pollutants; D002244:Carbon