Effect of temperature control conditions on DPF regeneration by nonthermal plasma.

Abstract

A regeneration test of a diesel particulate filter (DPF) was conducted under different temperature conditions with air as the gas source and a nonthermal plasma (NTP) injection system. We investigated the influence of the ambient temperature on the DPF regeneration performance and the oxidative decomposition amount of particulate matter (PM) and analyzed the changes in the PM oxidation characteristics by thermogravimetric analysis (TGA). The higher the temperature, the lower the decomposition amount of PM was under constant temperature conditions. The decomposition amount of PM was the highest at 80°C (3.74g), and the PM at interface P2 was not completely removed. The volume concentrations of the DPF regeneration products (CO and CO2) were higher under variable than constant temperature conditions. In addition, the peak temperature of interface P1 occurred 10-30min earlier, complete regeneration occurred at interface P2, and DPF regeneration occurred faster than under temperature conditions. The initial temperature of the control device was 110°C, and the maximum mass of PM oxidation decomposition was 4.26g after regeneration for 15min cooling to 80°C. The main form of elemental carbon (EC) transformed into the low ignition point component and the oxidation activity was improved after NTP injection.