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    • Structural Optimization and Validation of Selective Catalytic Reduction Mixer on Marine Diesel Engines
    DOI：10.13949/j.cnki.nrjgc.2022.02.006
    Key Words:selective catalytic reduction（SCR）  mixer  marine diesel engine  Tier Ⅲ
    Author NameAffiliationE-mail
    LI Jiangfei* Wuxi Yili Co.， Ltd.， Wuxi 214000， China
    College of Engineering， Peking University， Beijing 100871， China     		lijiangfeicae@126.com 
    ZHU Haiyan Wuxi Yili Co.， Ltd.， Wuxi 214000， China
    Hebei Yili Group Co.， Ltd.， Xingtai 054800， China     		 
    NIU Yufei Wuxi Yili Co.， Ltd.， Wuxi 214000， China
    Hebei Yili Group Co.， Ltd.， Xingtai 054800， China     		 
    XU Qian Wuxi Yili Co.， Ltd.， Wuxi 214000， China
    Hebei Yili Group Co.， Ltd.， Xingtai 054800， China     		 
    QIAO Baoying Wuxi Yili Co.， Ltd.， Wuxi 214000， China
    Hebei Yili Group Co.， Ltd.， Xingtai 054800， China     		 
    ZHANG Qiang School of Energy and Power Engineering， Shandong University， Jinan 250061， China  
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    Abstract:Six mixer schemes were designed for the selective catalytic reduction（SCR） after-treatment system on marine diesel engines. The mixer schemes were simulated and analyzed with computational fluid dynamics（CFD） technology. The optimal scheme was selected by comparing the back pressure， uniformity， urea impingement， urea track and velocity. Finally， the emission performance was verified by engine bench tests. CFD and experimental results show that scheme in which venturi tube is located upstream and the blade plates staggere left and right can meet the requirements of back pressure and NH3 uniformity， with the minimum risk of deposit. The NOx emission of E3 cycle in scheme 3 is 0.66 g/（kW·h）， which meets the requirements of International Maritime Organization（IMO） Tier Ⅲ emission standard. The average NOx conversion efficiency is 91.4%.
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