Numerical Calculation of PM Trapping and Oxidation of Diesel Particulate Filter with Catalyst
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Abstract
Exhaust gas from the diesel engine contains particulate matter (PM) of soot that affects human health and the environment. For the reduction of the emission of the PM, the diesel particulate filter (DPF) is placed in the exhaust system. The pressure drops increases with the PM deposit quantity in the DPF, which results in the burden of the engine. Therefore, the PM should be removed regularly by oxidation process called regeneration. Consumption of fuel is improved by optimizing the timing of regeneration. However, it is difficult to visualize the behavior of PM trapping and oxidation. We have proposed a series of models from PM deposition to the oxidation process in the DPF. In this study, the behavior of deposition and oxidation of PM in the DPF with a catalyst are calculated. The numerical calculations are performed to estimate PM deposition-oxidation process within the DPF. The results are obtained using the simplified model constructed in this study. The calculation technique we proposed will enable the qualitative examine after changing the shape of DPF, which can be useful for the optimization design of DPF.