Optimization Analysis of Urea Mixer for China Ⅵ Post Processor
The typical technical route for diesel engine to meet China emission legislation stage Ⅵ is DOC+DPF+SCR/ASC technical scheme,which meets the emission limit of China emission legislation stage Ⅵ for NOx,it is necessary to further increase the amount of urea injection,which also increases the risk of urea crystallization in mixer.The urea mixer in box has a great impact on urea crystalli-zation,so it is necessary to optimize the structure of the mixer to improve the ability of resisting urea crystallization.Combined with the CFD analysis and test results,the urea mixer was optimized and the CFD simulation calculation was carried out again after the struc-tural design was completed.According to the calculation and analysis results,it can be seen that the optimized design of the new mixer basically meets the design requirement,and the structure scheme of the mixer was determined,locking the overall structure of the box-type post processor for 6.6 L China Ⅵ diesel engine.
mixerurea crystallizationuniformitysubstrateliquid film
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