Ultra-Low Emissions of Heavy-Duty Diesel Engine with Dual-injection SCR System
On a heavy-duty diesel engine of China Ⅵ b emisison,the potential of achieving ultra-low emission was explored by matching a dual-injection copper-based SCR system.The research showed that the dual-injection SCR system had the ability to meet the emission limits of Euro Ⅶ emission draft through optimization of engine exhaust thermal management,combined with collaborative optimization of ammonia storage and equivalent injection strategies.In additon,it was found that urea injection significantly increased PN emissions,with a much greater effect on PN10 than on PN23 .Among them,the urea injection of uf-SCR had a greater effect on PN10 emission,which could be reduced by optimizing the SCR mixer.The experiment found that N2 O emissions of engine were relatively low and mainly generated in the catalytic converter,especially in SCR and ASC units. The generation mechanism and rate of N2 O had much difference in different temperature ranges,which was closely related to urea injection.
diesel engineSCRinjection strategyemission control
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