Abstract
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 ufSCR had a greater effect on PN10 emission, which could be reduced by optimizing the SCR mixer. The experiment found that N2O 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 N2O had much difference in different temperature ranges, which was closely related to urea injection.
Key words
diesel engine /
SCR /
injection strategy /
emission control
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ZHU Minlin，WANG Hui，GAO Jianbin，ZHAO Lingmeng，LI Mingxing，WANG Xiaohui.
Ultra-Low Emissions of Heavy-Duty Diesel Engine with Dual-Injection SCR System[J]. Vehicle Engine. 2024, 0(4): 9-16
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