氧化型催化器载体长度对柴油机排放性能的影响

Effect of DOC Carrier Length on Emission Performance of Diesel Engine

摘要:

基于轻型柴油机台架试验平台，研究柴油机氧化型催化转化器（DOC）载体长度变化对后处理系统减排性能的影响.结果表明：适当增大DOC载体长度可提高对一氧化碳（CO）、总碳氢化合物（THC）和一氧化氮（NO）的氧化率，过量增大对氧化性能的提升有限，同时影响DOC在低温低负荷下减排效果；DOC耦合催化型柴油机颗粒捕集器（CDPF）对颗粒物数量（PN）的减排效果受DOC载体长度影响较小.从兼顾成本与性能的角度出发，适当增大DOC载体长度能有效提高减排效果，但过量增大对减排效果提升影响不大.

Abstract:

Based on lightduty diesel engine bench test platform, the effect of the length of diesel oxidation catalyst’s(DOC) carrier on the emission reduction performance of aftertreatment system was studied. The results show that, increasing the length of the DOC’s carrier can increase the oxidation rate of carbon monoxide(CO), total hydrocarbons(THC) and nitric oxide(NO). However, excessive increase in the length of the DOC carrier has limited improvement on the oxidation performance and will reduce the emission reduction effect of DOC under low temperature and low load. The reduction rate of DOC coupled catalyzed diesel particulate filter(CDPF) on particle number(PN) is less affected by the length of the DOC carrier. From the perspective of balancing cost and performance, appropriately increasing the length of the DOC carrier can effectively improve the emission reduction effect, but the excessive increase has little effect on the improvement of emission reduction effect.