DOC辅助DPF再生方法研究

Study on DOC Auxiliary DPF Regeneration Method

在氧化型催化转化器上游排气管中喷入柴油,使其与发动机尾气混合,通过催化转化器使柴油氧化并发出热量来提高发动机的尾气温度,从而实现颗粒物捕集器的再生。整个系统由喷油器、氧化型催化转化器及颗粒物捕集器组成。在发动机台架上对该系统的再生特性进行研究,包括不同模拟车速及不同喷油量时氧化型催化转化器后尾气所能达到的温度;再生时催化转化器后尾气的温升特性;再生时捕集器的背压特性;再生方法的经济性及二次污染分析。结果表明:模拟车速大于60 km/h便可以进行喷油再生;整个再生时间为330 s;再生方法的经济性较好,二次污染物主要为HC和CO。

Diesel oil is injected into upriver vent-pipe of diesel oxidation catalyst（DOC） and mixed with the engine exhaust.The diesel oil is oxidized through the catalytic converter and gives out heat to improve the engine exhaust temperature,thus realizing the regeneration of diesel particulate filter（DPF）.The whole system consists of fuel injector,oxidation catalytic converter and particulate filter.The regeneration characteristics of this system are researched on the engine bench,including the attainable temperature of exhaust after oxidation catalytic converter at different simulation vehicle speeds and different injection quantities;the temperature rise characteristics after catalytic converter during regeneration;the back pressure characteristics of particulate filter in regeneration process;and the analysis on the economy and secondary pollution of the regeneration method.The results show that when simulation speed is greater than 60 km/h,injection and regeneration can be carried out.The whole regeneration time is 330 s,the economy of the regeneration method is good,and the secondary pollutants are mainly HC and CO.