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Optimisation design of short pitch spiral hybrid SCR structure for improving the exhaust performance
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ( IF 1.7 ) Pub Date : 2021-04-14 , DOI: 10.1177/09544070211011093
Chaofeng Zhang 1 , Xiaocheng Hou 1 , Kai Lu 2 , Wei Zeng 2 , Junhua Zhao 1
Affiliation  

As exhaust emission standards become increasingly stringent, the requirements for diesel exhaust post-treatment systems become increasingly demanding. This research focuses on the optimisation of a new hybrid structure to improve the performance of exhaust post-treatment systems. First, a short pitch spiral mixing chamber with sufficient mixing space and low temperature loss was designed to improve the evaporation of liquid droplets. Additionally, a conical plate mixer was used to conduct secondary mixing of the gas to improve the flow characteristics further. The ammonia uniformity and crystallisation risk of the new hybrid structure were simulated using Computational Fluid Dynamics, and the optimal hybrid structure was verified by tests. The results showed that ammonia leakage, low temperature crystallisation and NOX conversion efficiency could effectively be improved by optimally designing the new hybrid structure. This research is of great significance for reducing exhaust pollution and optimising diesel exhaust post-treatment systems.



中文翻译:

短节距螺旋混合动力SCR结构优化设计以提高排气性能

随着废气排放标准变得越来越严格,对柴油机废气后处理系统的要求也越来越高。这项研究的重点是优化新型混合结构,以提高排气后处理系统的性能。首先,设计了具有足够混合空间和低温损失的短节距螺旋混合室,以改善液滴的蒸发。另外,使用锥形板混合器进行气体的二次混合以进一步改善流动特性。利用计算流体动力学模拟了新型杂化结构的氨气均匀性和结晶风险,并通过测试验证了最佳杂化结构。结果表明,氨泄漏,低温结晶和NO X通过优化设计新的混合结构,可以有效地提高转换效率。这项研究对于减少废气污染和优化柴油机废气后处理系统具有重要意义。

更新日期:2021-04-15
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