Effect of temperature on carbon nanoparticle collection efficiency using photoelectric ESP.
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.
Kim
Woojin
W
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.
Jung
Jae Hee
JH
Song
Dong Keun
DK
Kim
Hakjoon
H
Kim
Yong Jin
YJ
Kim
Sang Soo
SS
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
D000393:Air Pollutants; D002244:Carbon