Technical Paper
Aftertreatment Package Design for SCR Performance Optimization
2011-04-12
2011-01-1135
Generally, an Urea-SCR system for diesel engines sets the NOx reduction efficiency to 80-90%. The SCR system is theoretically able to achieve the NOx reduction over 95%, but, due to the combination of design factors, the result is varying. The influence factors are the exhaust gas temperature, SCR control strategy, urea dosing parts, flow uniformity, etc. Some factors depend on the exhaust system package. Thus, a system engineer must consider the relation between variable requirements and variable design factors. The design targets for aftertreatment package in this work are following: Improvement of NOx reduction efficiency Improvement of noise reduction performance To meet Exhaust back-pressure requirement Minimization of package volume Minimization of urea-deposit The aftertreament strategy of the discussed subject are the SCR system for EURO V and the DPF+SCR system for Japan 2009, the developed vehicle are the heavy duty truck and the express bus.
