Particle and Aerosol Research Vol. 3, No. 3, 4, December 2007 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Simultaneous on-line analysis of diesel PM and gaseous species during transient operation
Hak-Joon Kim, Bang-Woo Han and Yong-Jin Kim*
Abstracts
during
transient operation was investigated using multi DMAs (Differential Mobility Analyzer) and CPCs (Condensation
Particle Counter) and gas analyzer with FID (Flame Ionization Detector) to understand the relationship among
the engine conditions such as speed and load, the number concentrations of diesel PMs and the concentration of
gaseous components in real-time. Particles of 30 nm in diameter were selected for nuclei mode particles, and those
of 60, 90 and 120 nm were for accumulation mode particles. In front of and at the rear of DOC (Diesel Oxidation
Catalyst) and also at the rear of DPF (Diesel Particulate Filter), the number concentrations of the particles with four
sizes were measured to investigate the effects of after-treatment systems and dilution temperature on the diesel
PMs and gaseous hydrocarbons. It was observed that the number concentrations of the particles with four sizes
were reduced about 10% after DOC and over 98% after DPF. The emission pattern of 30 nm sized diesel PM in
transient operation was changed significantly by DPF and dilution temperature, while those of 60, 90 and 120 nm
ones were nearly independent of after-treatment systems and dilution temperature. The emission of THC (Total
Hydrocarbon) was found to be closely associated with the engine speed, while that of SOF (Soluble Organic Fraction)
with the engine load. Especially, the concentrations of 30 nm sized particles were sensitively varied according
to the THC/SOF concentrations.
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