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| Development and Validation of a Selective Catalytic Reduction System for China Ⅵ Regulations Compliant On-Road Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2020.02.006 |
| Key Words:diesel engine aftertreatment mixer of selective catalytic reduction |
| Author Name | Affiliation | | YANG Yanxiang,ZHANG Hongtao,ZHANG Yuanqing,GENG Xiang,HE Zhengshan,LI Pan | 1.Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072, China
2.School of Mechanical Engineering， Tianjin University， Tianjin 300072, China
3.Wuxi Henghe EP Tech Co., Ltd., Wuxi 214100, China |
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| Abstract:A drum-type aftertreatment system equipped with a new type of circumferential variable flow exhaust mixer was developed.Taking the aftertreatment of a 3.0 L China Ⅵ diesel engine as an example. First, the structure of the exhaust mixer was designed, the models of flow, as well as urea injection, atomization and diffusion in the catalytic converter were established, the full-scale exhaust flow field simulation analysis was carried out, the velocity uniformity, NH3 concentration distribution and pressure drop loss of the mixer were studied, and feature sizes were optimized. The results show that the uniformity of NH3 can reach 0.996 with the pressure drop of less than 4.17 kPa at the rated condition. Then, the validation by bench test was conducted. The results show that the newly designed aftertreatment system has smaller resistance, NH3 uniformity at the rated condition is 0.98, the mixer without spoiler performs better at different space velocities and temperatures. Finally, the engine emissions testing was carried out, the WHTC and WHSC cycle emissions meet the requirements of China Ⅵ standards, confirming that the newly developed SCR system and mixer can be used in the China Ⅵ heavy-duty diesel engine for on-road vehicles. |
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