The effect of operating parameters on regeneration characteristics and particulate emission characteristics of diesel particulate filters

Due to stringent emission standards, diesel particulate filter (DPF) is used to reduce and control particulate matter (PM) emissions for engine manufacturers. The periodical regeneration the DPF by oxidizing the accumulated PM is able to avoid pressure drop build-up and fuel efficiency decrease. This paper discusses the influence of regeneration temperature, regeneration flow rate and regeneration time on both regeneration and emission performance by regeneration test bench. From the temperature distribution profiles, the maximum temperatures were achieved at rear and center part of DPF in all the regeneration tests. When the regeneration temperature was higher than 525 degrees C, it was benefit to emit the large diameter particles. Increasing the flow rate had negative effect for the maximum temperature, maximum temperature gradient, and regeneration performance ratio. The trends for regeneration efficiency, total mass concentration and emitted particle average diameter were similar under different regeneration flow rates. Increasing regeneration time was benefit for improving regeneration efficiency, but it had negative effect for the performance ratio. The optimization active regeneration operating parameters were achieved after considering both regeneration and emission characteristics.