An experimental study about the characteristics of reciprocating flow regeneration of diesel particulate filter with diesel vapor injection

To strengthen the practicality of the periodic reciprocating flow (PRF)regeneration of diesel particulate filter (DPF), a compact structure of PRF-DPF system with diesel vapor injection is developed. An experimental study is carried out about the regeneration characteristics of the PRF-DPF system. The results show that U-type passage structure can form a new heat recovery mechanism of PRF through internal heat conduction, in which a temperature fluctuation cycle within each forward flow or backward flow is formed; the complete oxidation of HCs can be achieved as a diesel vaporizer be installed at about 330 mm in front of the entrance end of DPF catalyzer, and the wider middle region can be kept at 400-520 degrees C through supplying 5.0 ml/min-20# diesel vapor at a 12.4 kW engine load; As injected 7.0 ml/min-10# diesel vapor at a 11.8 kW engine load, the PRF can provide the simultaneous process conditions of C-NO2, 2 , C-NO2-O2 2 -O 2 and C-O2 2 reactions and remove particulate matter (PM), thus and the filtration efficiency of PM can be higher than 99 %.