Mechanism And Modeling Investigation Of Loading And Regeneration On Diesel Particulate Filters

The key technology of designing diesel particulate filters is choosing filters and regeneration. In our country the research in this field is on initial stage, it is due to lacking effective design method and theory experiment is the main developing means whose disadvantage is large investment with small profit, so now there is no commercial product yet. In consideration of this condition this paper is aimed to establish loading fluid model and regeneration model of particulate trap, consequently provide theory guidance for design.In this paper ceramic wall-flow monoliths (SiC) was believed a best filters material after making comparison between several filter materials. Moreover its filter mechanism was analyzed and a one-dimensional fluid model of loading process was established. The flow distribution was analyzed that proved a reference for choosing filters.Research on the regeneration mechanism is the main point in this paper which is nearly in blank home presently. According to the heat regeneration mode of particulate filters a zero-dimensional mathematical model including incomplete oxide reaction of carbon was established. Furthermore a one-dimensional regeneration model for heat regeneration, fuel additive regeneration and continuous catalysis regeneration was established. Compared with previous one in this model the geometry of particulate layers was more approximate to fact, the heat reproduction and fuel additive regeneration mechanism model was improved in which the reaction between NO₂ and HC in exhaust was added, the negative effect of inactive ash to addictive was considered in this model too. Numerical simulation was made using the mode established in this paper. Compared between the result of simulation and experiment, it was proved that the result of simulation was satisfactory and the complex one-dimensional mathematical model including multi regeneration mode was accurate and reliable. The influences of addictive concentration, loading of particulate filters, VOF content, exhaust mass velocity in regeneration process to regeneration were analyzed. All the researches provided theory for the design of diesel particulate filters and guidance for future research on diesel particulate filters regeneration.