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Abstract Particulate matter (PM) emissions from a heavy duty diesel engine which meets the national V emission regulations were studied, and the engine was equipped with/without diesel oxidation catalyst (DOC) and catalyzed diesel particulate filter (CDPF), and the test fuels included 20% biodiesel fuel and pure diesel fuel. Results showed that the size distribution of exhaust particulate number from the engine without DOC+CDPF showed double-peak distribution, and the peak diameter of particulate number were about 10nm and 50nm when using B20 fuel, and about 50nm and 200nm when the engine using diesel fuel. The particulate number from the engine with B20 fuel was higher than diesel fuel at the area that particulate diameter was smaller than 120nm. The size distribution of particulate number from the engine with DOC+CDPF showed multi-peak distribution, and the peak diameters of particulate number were about 10nm, 20nm and 60nm respectively. Compared to the engine without exhaust gas aftertreatment, DOC+CDPF could evidently reduce particulate number whether the engine using B20 fuel or diesel fuel, the decreasing range was remarkable when the particulate diameter was between 60~200nm. The purification efficiency of total particulate number from the engine with B20 fuel was higher than that of diesel fuel at the same operating conditions.
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Received: 12 February 2015
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