微粒捕集器捕集性能及再生技术研究

Research on Capture Performance and Regeneration Technology of DPF

针对微粒捕集器捕集性能和再生中存在的问题,通过GT Power软件建立微粒捕集器捕集性能仿真模型和喷油提温再生仿真模型,分析通道密度和过滤壁渗透率对捕集性能的影响,并从喷油率与补气率的配比上对微粒捕集器进行提温优化。结果表明,通道密度CPSI值越大,初始捕集效率越高,压降越大;过滤壁渗透率对捕集效率的影响不大,过滤壁渗透率越大,压降越小;通过优化喷油率和补气率配比后提温时间缩短了49 s,峰值温度提高了21.81 K,更有利于微粒捕集器的再生。

To improve the capturing and regeneration performance of DPF,simulation models of capture performance and fuel injection regeneration of DPF are established using GT Power software.The influence of CPSI and filter wall permeability on the capture performance have been analysed.Optimisation of the temperature of the particle trap is simulated by assessing the ratio of fuel injection rate to gas filling rate.The results show that the larger the CPSI value,the higher initial trapping efficiency and the greater the pressure drop.Additionally,the permeability of the filter wall has insignificant effect on the capture efficiency.The larger the permeability of thefilter wall,the smaller pressure drop;By optimizing the ratio of fuel injection rate to gas filling rate,the heating time is shortened by 49 seconds,and the peak temperature is raisedby 21.81 K,which is beneficial to the regeneration of the particulate trap.