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| Effects of Mixer on Urea Deposit in Selective Catalytic Reduction for China Ⅵ Diesel Engines |
| DOI：10.13949/j.cnki.nrjgc.2021.02.005 |
| Key Words:selective catalytic reduction(SCR) mixer urea deposit diesel engine China Ⅵ |
| Author Name | Affiliation | | LI Jiangfei, NIU Yufei, ZHU Haiyan, WANG Longfei, XUE Hongjuan , ZHANG Qiang | 1.Wuxi Yili Co., Ltd., Wuxi 214000, China
2.Hebei Yili Group Co., Ltd., Xingtai 054800, China
3.FAW Jiefang Dalian Diesel Engine Co., Ltd., Dalian 116600, China
4. School of Energy and Power Engineering, Shandong University, Jinan 250061, China |
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| Abstract:In order to solve the problem of urea deposit in the selective catalytic reduction (SCR) aftertreatment system of a China Ⅵ diesel engine, two mixers of different structures were designed. Simulation analysis and comparison of urea impingement, urea track, air flow velocity, uniformity of velocity, uniformity of NH3 and pressure loss was carried out through the computational fluid dynamics (CFD) technology. Finally, the emissions and deposit performance of the two mixers were tested by engine bench. The CFD and test results show that Mixer 2 is superior to Mixer 1 in the air flow velocity, the uniformity of velocity and the uniformity of NH3, but has bigger pressure loss. The deposit weight of Mixer 1 was measured as 608g by engine bench test, which fails to meet the requirements of OEMs. And the deposit weight of Mixer 2 was measured as 6g, which meets the requirement of OEMs. The trends of the CFD analysis and test results are consistent, indicating that the CFD analysis is appropriate and effective. |
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