Abstract
Due to their adverse health effects and their abundance in urban areas, diesel exhaust ultrafine particles caused by the aftertreatment devices have been of great concern in the past years. An experiment of particles number emissions was carried out on a high-pressure, common rail diesel engine with catalytic diesel particle filter (CDPF) to investigate the impact of CDPF on the number emission characteristics of particles. The results indicated that the conversion rates of CDPF is over 97%. The size distributions of particles are bimodal lognormal distributions downstream CDPF at 1400 r/min and 2300 r/min. CDPF has a lower conversion rates on the nucleation mode particles. The geometric number mean diameters of particles downstream CDPF is smaller than that upstream CDPF.
Highlights
Particulate matter and nitrogen oxide (NOx) emissions from diesel engines are being recognized as the pollutants having adverse effects on the environment as well as on human health[1]
The results indicated that the nucleation mode particles would increase and the bimodal size distribution would appear only when the DOC and diesel with high sulfur were used together
It can be seen that the size distribution of DEP upstream catalytic diesel particle filter (CDPF) is mono-modal at 1400 r/min, and the peak concentration are at the diameter of 39-70nm at
Summary
Particulate matter and nitrogen oxide (NOx) emissions from diesel engines are being recognized as the pollutants having adverse effects on the environment as well as on human health[1]. Over the past few years, researches have begun to address the questions of the number concentration of DEP [3, 4] and regulations have been made to the number emissions of DEP in Euro V and VI emission standards Among these after-treatment units, catalytic diesel particle filter (CDPF) has proved to be a very effective and promising technology for the abatement of particulate matter (PM) emissions from diesel engines. This technique reduces PM mass, and provides good control over the number of ultrafine particles. An experiment was carried out to investigate the number emission characteristics of particles emitted by the diesel engine with catalytic diesel particle filter (CDPF)
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