怠速工况下氧化型催化转换器辅助DPF再生方法

DOC Assisted DPF Regeneration under Idle Condition

摘要:

在柴油机颗粒物捕集器(DPF)前端安装氧化型催化转换器(DOC)，通过在氧化型催化转换器前端喷入柴油来提高柴油机尾气温度，并通过降低柴油机尾气流量进一步提高尾气温度，可以实现柴油机颗粒物捕集器再生。整个再生系统由喷油器、氧化型催化转换器和柴油机颗粒物捕集器组成。在发动机台架上对该再生方法进行系统试验研究，包括再生时氧化型催化转换器的升温特性、喷油流量与温度升高幅度的关系、DPF再生过程和再生方法的燃油经济性及二次污染。结果表明怠速工况下DOC辅助DPF再生能顺利实现，再生过程消耗柴油120.5g，再生过程中排放的CO和HC分别为12.4g和1.1g。

Abstract:

Diesel oxidation catalyst was installed in front of diesel particulate filter. The engine exhaust temperature was improved by insufflating diesel oil into vent-pipe upriver diesel oxidation catalyst. The engine exhaust flow was reduced to further improve the exhaust gas temperature and achieve the regeneration of diesel particulate filter. The system was consisted of fuel injector, diesel oxidation catalyst and diesel particulate filters. Study on regeneration characteristics of this system on engine test-bed, including the temperature characteristics of the diesel oxidation catalyst in regeneration, the relationship of injection flow rate and temperature, DPF regeneration process and the fuel economy and secondary pollution of regeneration. The results demonstrates that DOC assisted DPF regeneration can be successfully achieved under idle condition, diesel oil consumption under regeneration process is 120.5g, emissions of CO and HC under regeneration process are 12.4g and 1.1g, respectively.