Effect analysis on regeneration speed of continuous regeneration-diesel particulate filter based on NO2-assisted regeneration

Özet

In order to improve the regeneration speed of Continuous Regeneration-Diesel Particulate Filter (CR-DPF)based on NO2-assisted regeneration, a mathematic model of the NO2-assisted regeneration is developedand verified by experiments and numerical simulation. Furthermore, the influences on regenerationspeed from exhaust airflow and filter structure are studied in NO2-assisted regeneration process of CRDPF.The results show that: the regeneration speed will be increased due to the increase of the volume ofthe exhaust gas, the temperature of the exhaust gas, the concentration of the NO2 and the concentrationof the O2 in exhaust gas, but the regeneration speed will be decreased under other conditions such asm(NO2)/m(PM) being less than its threshold in exhaust gas, the increase of the filter length in CR-DPF orthe increase of the channel density when initial amount of the carbon particles in filter being less than itsthreshold, moreover, thickness of channel wall has no effect on regeneration speed. And the suitablerange of values for some key parameters being useful for enhancing regeneration speed and reducingpressure drop of CR-DPF has been provided.