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A new kind of diesel particulate after-treatment system (EDPF) has been developed. It uses stainless steel nets as the particulate trapping part and uses reverse blowing unit combining with centrifugal collector as the regeneration part. In order to improve the filtering efficiency of stainless steel nets, corona-discharging technology is applied to charge particles before the stainless steel nets. The test result on the 6110 Diesel bench scale shows that the filtering efficiency of the EDPF system can reach to about 70% and the EDPF system is successful.

Three types of after-treatment for reduction of diesel exhaust particulate are investigated mainly about their characteristics of filtration and regeneration. They are ceramic foam filter (CFF) and microwave regeneration (MR), stainless steel net trap with electrostatic collector (SSNTEC) and reverse jet regeneration (RJR) with high pressure gas, wall flow ceramic filter (WFCF) and infrared heating regeneration (IHR). With the data from experiments, the filtration efficiency of CFF is up to 60% and the efficiency of MWR reach 80% upward. The average efficiency of SSNTEC is about 60% and the efficiency of RJR is just 55%. WFCF and IHR have outstanding performance, the efficiency of WFCF reach 90% upward and its IHR is complete.

A kind of fibrous filter made from stainless steel (SS) wire net has been developed by in our institutes. This paper is to study modeling and computing method for the fibrous filters with image effect based on the previous studies. It takes the exhaust aerosol of diesel engine as an even floating flow composed of exhaust and particulate, under the effect of electrical field force, the particulate deviate from other gas phase components and deposit on the fibers. Mathematics models for calculating the flow and the electric field, as well as the capture efficiency are given in this paper. These mathematics models are used for calculating a single fiber model.