中重型柴油机 SCR 系统集成匹配研究

摘要

For the development of highly compact,efficient and clean diesel engine,the technical route of SCR aftertreatment was selected.In order to meet China Ⅴ emission standard,the analysis and matching of SCR catalysts and catalyst substrates were respectively conducted and the calibration of urea injection system was studied.The optimized design of injection pipe lay-out and the calculation and verification of SCR conversion efficiency were further carried out based on 3D simulation and theory of urea hydrolysis,pyrolysis and chemical reaction kinetics.The calibrated SCR system was verified to be able to meet China Ⅴemission requirement by the bench test.%针对高紧凑高效清洁柴油机的开发，选取了 SCR后处理技术路线，为了实现国Ⅴ的排放指标要求，分别进行了 SCR 催化剂及催化器载体的分析与匹配，SCR 尿素喷射系统的匹配标定研究，并通过三维仿真分析方法以及尿素喷射水解、热解和化学反应动力学理论完成了喷射管路布置方式的优化设计及 SCR 系统转化效率的计算与验证。通过发动机台架试验验证了通过上述方法匹配的 SCR 系统可以满足国Ⅴ的排放指标要求。