Clean Technology 2009
K. Chen, K.S. Martirosyan, D. Luss
University of Houston, US
diesel particulate filter, soot regeneration, moving temperature front
IR imaging technique was used to identify the dynamic features of the particulate matter regeneration in diesel particulate filter (DPF) that used for reduction of diesel engine exhaust. We report here the results of extensive set of IR imaging experiments aimed at determining the impact of fixed operating conditions such as oxygen concentration, soot loading and flow rate on the spatiotemporal temperature during the catalytic soot regeneration on a single channel planar DPF. The experiments revealed some very intricate and unexpected features of the moving temperature fronts during PM regeneration and their sensitive dependence of the combustion mode and number and locations of the ignition points on the controlled operating conditions. At feed temperature of 635 oC the soot combustion rate was uniform all over the surface at low oxygen concentrations. At higher oxygen concentrations local ignition occurred at either one or several locations. The maximum temperature of the moving fronts was much larger those attained during the uniform combustion. In general, increasing either the oxygen concentration or the soot loading increased the moving front temperature and velocity.