Visualization on Reaction of Diesel Particulates in Regeneration of DPF

Katsunori  Hanamura, Tokyo Institute of Technology

Reaction in regeneration was clarified through visualization experiments, using a half cylindrical wall-flow DPF covered by a quartz glass plate. On the surface of the DPF wall made of cordierite, there are many craters that have an average diameter of about 100 microns. Diesel particulates are trapped first by the inside surface of the craters, and then, are deposited uniformly on the entire region of the wall surface along the convex and concave configurations. The most striking feature is that the regeneration process starts from the location of the craters. The locally regenerated regions are connected together, and then, make many particulate-cake islands distributed on the DPF wall surface. The average diameter of the cake islands becomes smaller and smaller, depending on the Arrhenius-type reaction rate. Finally, the regeneration is completed. As a result, the particulate cake reacts heterogeneously with oxygen. Furthermore, the large-scale craters distributed on the DPF surface provide a significant influence for the enhancement of the reaction rate in regeneration.

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