Experimental Study on Diesel Particulate Filter with Reciprocating Flow

Abstract

In this article, a new diesel particulate filter (DPF) system with reciprocating flow is proposed and an experimental study on the characteristics of the active-passive component regeneration of the DPF system was carried out. The temperature, pressure difference and pollution emissions of the DPF system are measured under stable operation conditions. The process of treating pollution and regeneration of the DPF system as well as the effects of reciprocating flow cycle on the performance of the DPF system are analyzed. Results show (1) the DPF system can use the pollutants in emissions and a tiny amount of extra fuel to maintain the chemical reaction, periodically releasing heat and storing heat and reversely blowing away ash, which in turn realize the regeneration of the cDPF. (2) with the reciprocating flow cycle increasing, the temperature profile moves parallel toward the downstream side of the DPF system and the fluctuating range of CO、NO and NO2 components increases. (3) if a reasonable temperature in upstream DOC and cDPF during each half cycle is formed, the regeneration efficiency of the DPF system can be obviously improved and the average content of PM emission can be kept at a quite low level.