Numerical Study Of The Diesel Particulate Filter Regeneration Performance

Diesel Particulate Filter (DPF) regeneration performance is an urgent need to address thekey technical issues, the heat transfer characteristics of the filter regeneration, regenerationefficiency, energy input filter regeneration work will directly affect the safe, efficient,economic and other properties, the characteristics of the filter regeneration research hasimportant scientific significance and application value. In this paper, experimental verification,to build a one-dimensional numerical model of non-steady-state DPF regeneration, the DPFregeneration characteristics numerical study, in order to reduce the workload of theexperimental operation, to provide direction and theoretical basis for the experiment, at thesame time to meet the State IV emission standards DK4A the engine provide adviceregeneration timing.In this paper, based on the establishment of the DPF regeneration one-dimensionaltransient model, analysis of the DPF regeneration characteristics, as follow:(1) Combined with DK41A engine operating conditions, analysis the exhaust flow DPFthermal shock,found that: with the increase in traffic flow DPF internal temperature gradienttrend first and then decreases; cause failure of the DPF thermal stress due to excessivetemperature gradient, affect the filter body of work safety, should try to choose the properflow reduced wall temperature gradient, the final analysis found that when the free streamflow rate of15g/s, the minimum temperature gradient can avoid the reproduction filterelement thermal stress failure.(2) Analysis of different geometry parameters, on the DPF heat transfer characteristics.A reasonable choice of parameters and the regeneration conditions of the DPF geometricbodies, in order to reduce the DPF internal temperature gradient, and effectively avoid thethermal stress failure of the filter body. found that: does not affect the condition of thetrapping efficiency of the DPF and the exhaust back-pressure, a reasonable increase in theDPF, length, volume, wall thickness, to improve the heat capacity of the filter material aswell as appropriate to reduce the CPSI and regeneration of the DPF when the heatingtemperature, to reduce the DPF wall temperature gradient.(3) Analysis of DPF the regeneration heat transfer characteristics (wall temperature, thewall temperature gradient), the regeneration efficiency, energy input parameters; optimalperformance ratio based on renewable the DPF heat transfer characteristics research. Thestudy found that: The model DPF regeneration timing particulate loading amount for the5g/L, the best reproduction of traffic for the15g/s, the optimal regeneration temperaturepulse time of297s; reproduction Under this condition, can effectively prevent the DPF regeneration thermal damage, while it ensures a higher DPF regeneration efficiency andrenewable low energy input.The findings will further improve the DPF regeneration characteristics analysis oftheoretical data for DPF regeneration timing of the reference and data support for subsequentexperiments.