AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Particle Emission Properties during DPF Actice Regeneration
HIROYUKI YAMADA, Satoshi Inomata, Hiroshi Tanimoto, National Traffic Safety and Environment Laboratory
Abstract Number: 647 Working Group: Urban Aerosols
Abstract Mechanisms involved in increased particle and volatile organic compound (VOC) emissions during active and parked active regeneration of a diesel particulate filter (DPF) were investigated using heavy-duty trucks with and without a urea selective catalytic reduction (SCR) system. Particles emissions increase in the latter part of the regeneration period, and the mechanisms differed at particle sizes above and below 23 nm. Particles with sizes above 23 nm were emitted due to the lower filtering efficiency of the DPF because of the decreasing amount of soot trapped during regeneration . Small particles (below 23 nm) were mainly sulfate or sulfuric acid particles trapped by the catalyst and emitted due to the increased temperature during regeneration. These particle emissions from the SCR system continued for a longer time period because of the higher temperature of the catalyst compared with a non-SCR system. As pointed out by former researchers, these particles seem to be semi-volatile particles, but the volatility was lower than they expected.