Experimental Investigation On The Steady Regeneration Performance Of DPF

The wall-flow diesel particulate filter(DPF)is one of the most effective devices to reduce particulate matter(PM)of diesel engine,while the reliable and efficient regeneration technologe is the prerequisite and guarantee of industrialization.In this article,the stable regeneration performances of DPF were investigatied,which can help to understand the regeneration mechanism,moreover can provide experimental basement of performance optimization and regeneration control stratiges.Which lead to this study has important significance and application value.The heat transfer characteristics of bare DPF were investigatied based on the regeneration testing bench with additional source,the experimental results show that: with the increases of incoming temperature and flow,with the increase of DPF’s length and CPSI,the heat transfer characteristics increase.Adding the thermal inertia after the filter,it can greatly reduce the thermal stress appeared in DPF centren outlet place.The infuence of particle characteristics on DPF regeneration performance were investigated based on the diesel loading bench and the regeneration testing bench,the experimental results show that: the carbon black with same particulate size but larger specific surface area was more easily to be oxidized and regenerated;the regeneration efficiency and the regeneration performance ratio were higher.The carbon black with higher content of simulated soluble organics fraction was easily to be oxidized;the regeneration efficiency and the regeneration performance ratio were higher.The carbon black after heat treatment which contains 20 percent of simulated soluble organics fraction was more easily to be oxidized;the regeneration efficiency and the regeneration performance ratio were higher.Compare with carbon black,the diesel engine soot was easily to be oxidized;the regeneration efficiency and the regeneration performance ratio were higher.The infuence of deposited ash on DPF regeneration performance were investigated based on the loading bench and the regeneration testing bench,the experimental results show that: with the increase of ash loading,the pressure drop increase,and the regeneration process was promoted,and the regeneration efficacy and regeneration performance ratio increase.With the decrease of ash diameter,the pressure drop increase,the regeneration efficiency and regeneration performance increase.Compared with the pure ash,the DPF loaded with mixed ash was easily to be oxidized,and the pressure drop decrease,while the regeneration efficiency and the regeneration performance ratio were higher.The influence of incoming condition and deposited ash on CDPF regeneration performance were invistigatied based on the loading bench and the regeneration testing bench,the experimental results show that: with the increase of incoming temperature,the reaction rate of carbon black in CDPF increased gradully,the regeneration efficiency and regeneration performance ratio increase.With the increase of duration of temperature pulse,the regeneration efficiency increase,while the regeneration performance ratio decreases gradually.With the increase of ash loading,the back diffusion of active molecules was obstacaled,and the regeneration efficiency and regeneration performance ratio decrease.At the incoming flow temperature close to 475℃,the carbon black loaded in DPF was almost not oxidized,while it oxidized severely in CDPF,the regeneration efficiency and regeneration performance increase.