Abstract
Based on a China Ⅵ heavy-duty diesel engine equipped with selective catalytic reduction (SCR) aftertreatment system, the fine particulate matter emission characteristics of diesel engine were tested according to WHTC.To obtain comparative data, particle numbers PN10 and PN23 were obtained from the raw exhaust pipe, the rear pipe of diesel particulate filter (DPF), and the end pipe. Based on the results of PN10 and PN23 emissions, a close coupling selective catalytic reduction (ccSCR) aftertreatment system was constructed to investigate the influence of aftertreatment system on emission characteristics of PN10 and PN23. The test results show that the fine particulate matter emissions in end pipe increase with the urea injection volume and the SCR inlet temperature, and the increasing trend for PN10 is more obvious than that for PN23. The percentage for fine particulate matters of 10-23 nm size is also positively related to temperature, which accounts for 55% of total particle size at 200 ℃, 75% at most between 240-280 ℃, and higher than 80% beyond 280 ℃. The comparison between the ccSCR route and the SCR route reveals that the ccSCR route can reduce PN10 and PN23 of steady state operating conditions by 50%-80% at each point. PN10 and PN23 emissions of transient WHTC cycle are 1.61×1011 and 2.92×1010 #/(kW·h) respectively, which reduce by 57.2% and 62.3% compared to the SCR route.
Key words
selective catalytic reduction (SCR) /
particle /
urea injection amount /
SCR inlet temperature /
close coupling
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ZHANG Wang，WU Hanming，LIU Qiang，WANG Maoxuan，LI Zhenguo，SHAO Yuankai.
Influence of Diesel Engine Aftertreatment System on Fine Particulate Matter Emission Characteristics[J]. Vehicle Engine. 2024, 0(5): 42 https://doi.org/10.3969/j.issn.1001-2222.2024.05.006
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