| 谭理刚，冯鹏飞，杨树宝，郭雅各，李子文.基于CFD的Urea-SCR混合器性能研究[J].内燃机工程,2018,39(4):61-66. |
| Study on Static Mixer Performance in Urea-SCR Systems Based on CFD Code |
| DOI：10.13949/j.cnki.nrjgc.2018.04.010 |
| Key Words:selective catalytic reduction（SCR） static mixer urea decomposition efficiency distribution uniformity conversion efficiency |
| Author Name | Affiliation | | TAN Ligang, FENG Pengfei, YANG Shubao, GUO Yage, LI Ziwen | 1.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
2.Guangxi Yuchai Machinery Group Co., Ltd., Yulin 537000, China |
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| Abstract:A numerical model including urea water solution(UWS) spray atomization, urea droplets evaporation and decomposition, spray-wall interaction and NOx catalytic reaction in urea-based selective catalytic reduction（SCR）systems was established by using computational fluid dynamics(CFD）code. The influence of the different layout schemes of static mixer on the atomization, evaporation, and decomposition of urea solution and the distribution uniformity of NH3 at the entrance of SCR catalytic converter was investigated. The numerical results show that the static mixer can improve the atomization performance of urea spray, the evaporation and decomposition efficiency of urea droplets and the distribution uniformity of NH3. The SCR system achieves the optimum atomization performance and the maximum decomposition efficiency of urea droplets when the static mixer is placed 1D（equal to the diameter of the exhaust pip） away from the injector. While the SCR system has the best distribution uniformity of NH3 when the static mixer is placed 3D away from the injector. The results of the bench test and numerical calculation reveal that the SCR system can achieve a better NOx conversion efficiency when the static mixer is placed 1D away from the injector. |
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