The Simulation And Experiment Research On The Performance Of Diesel Particle Filter

As more attention to environmental issues which people continue to pay and more stringent of emissions regulations, It is difficult to meet the requirements of increasingly stringent emission regulations only relying on the internal purification technology. Aftertreatment system will be the inevitable choice of diesel particulate emission control. In this paper, the following research is carried out about the diesel particulate filter.(1) A simulation model of DPF is established by using the GT-Power software, and the influence of structural parameters of DPF on the performance of DPF is studied. It is found that channels per square inch (CPSI) should be a little larger from the simulation results. The larger value of CPSI can increase the effective area of filter body with improving the capture efficiency of DPF. When the wall thickness is0.35mm, the capture efficiency of DPF is0.979. Continuing increase of wall thickness has little effect on the increase of capture efficiency. Instead, it will cause increase of the pressure drop. A smaller pore diameter will cause a greater initial capture efficiency, but smaller pore diameter increases material manufacturing difficulty. Porosity can’t be selected too large; The collection efficiency can be improved by increasing the volume of the filter body. Those provide a theoretical guidance for the design of DPF.(2) DPF of the test is designed according to the structure of the simulation. The performance of DPF and effect on engine performance is studied in the experiment. Experimental results show that DPF has high capture efficiency which can reach to94%at high load. While it increases the exhaust back pressure of the engine as result of increase of the engine’s fuel consumption rate. With the install of DPF, carbon emissions is significantly reduced under any load. Emissions of NO and CO are reduced at small load, but in contrary at high load. DPF can reduce engine noise and the maximum value of reducing noise is11.8dB.(3) The study which is based on cerium additives show that it can reduce soot emissions, prolong the service time, regeneration time interval of DPF and the carbon smoke point of ignition. Cerium additives is conducive to the DPF regeneration.