Numerical Simulation And Experimental Study For Burner-type Regeneration Diesel Particulate Filter

Diesel invented more than100years ago, has become one of the mainstream power machinery in modern society with good dynamic performance and low fuel consumption rate. But with the urgent needs of the people for environmental protection and stringent emission regulations, the diesel particulate emission problems has become an obstruction for the sustainable development of diesel engine, Diesel Particulate Filter is acknowledged as the most effective exhaust aftertreatment techniques to solve the problem. In this paper, we study the Burner-type Regeneration Diesel Particulate Filter products is suitable to the national conditions. Using AVL FIRE software to establish DPF three-dimensional model, and use the method of simulation calculation to analyze the parameters of DPF in loading and the process of regeneration, and test the effectiveness of Burner-type Regeneration Diesel Particulate Filter in complex urban road condition. This article main research work is as follows:(1) Analyze the advantages and disadvantages of filter materials and regeneration technology of DPF, set up the internal flow model, the pressure drop model and the regeneration model of honeycomb ceramic wall flow filter.(2) According to the characteristics of Burner-type Regeneration Diesel Particulate Filter, use FIRE to establish the three-dimensional model, analyze the changes of soot in loading process and the regeneration process, it is concluded that the soot in the process of loading process has the tendency to move to the end of the filter, and the combustion of soot will begin at the center of the filter during the regeneration process to the rule of radial and axial combustion. The pressure drop of DPF in the loading process affected by mass flow, CPSI, initial soot and so on. And analyze the effect of spray combustion effects on DPF regeneration.(3) Install the DPF on city bus, use the methods of Free Acceleration and Lug-Down Mode respectively to test exhaust smoke changes before and after installing DPF. The results of Free Acceleration show that the capture efficiency of DPF is above95%, the results of Lug-Down Mode show that the capture effect of DPF is also very obvious. Then in a complex urban road conditions, the changes of differential pressure test before and after the regeneration of DPF found that the regeneration process last only about600s, DPF differential pressure is about6kPa before regeneration and fall to1.5～2.0kPa after regeneration, this test fully explain that Burner-type Regeneration Diesel Particulate Filter is practical.