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| Simulation and Experimental Study of Urea-Selective Catalytic Reduction Mixer for a High Power Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2019.03.015 |
| Key Words:diesel engine selective catalytic reduction(SCR) mixer uniformity
conversion efficiency |
| Author Name | Affiliation | | ZHAO Yingliang, ZHU Zhifu, WANG Sheng, ZHAO Hong, GUI Jianhua, CHEN Peng | 1.School of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266000, China
2.School of Physical Sciences, Qingdao University, Qingdao 266000, China
3.Konyo Environmental Technology Co., Ltd., Weifang 261000, China |
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| Abstract:According to the requirements of the selective catalytic reduction (SCR) technology of a high power diesel engine, two schemes of installing and not installing a pre mixer before the injection point were designed. The computational fluid dynamics (CFD) technology was used to simulate the gas-flow trajectory, urea decomposition rate, NH3 distribution uniformity and pressure loss of the two schemes, and the D2 emission cycle test was carried out to verify the NOx conversion efficiency of the two schemes. The simulation and experimental results show that compared to the solution without a pre mixer, the pre-mixer can generate a swirl to promote the full mixing of urea droplets with gas flow, and increase the urea decomposition rate and NH3 distribution uniformity at a higher pressure loss, thereby improving the NOx conversion efficiency of the SCR system, which makes the NOx emissions meet EU Stage V emission regulations, and provides a bright future for the development of higher power diesel engines. |
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