| Since diesel engine was invented, it has been widely used for the good dynamic performance and economy. In order to meet the more stringent national vehicle emission regulation, Diesel Particulate Filter has been acknowledged to be the most effective exhaust aftertreatment technology to reduce particulate emission. Compared with other regeneration technologies, the Continuously Regeneration Technology is a completely passive regeneration technology and it has abroad prospects for development. Using AVL FIRE software to establish DOC+DPF three-dimensional model, the impact factors on the performance of DOC and DPF is studied based on numerical simulation, the results provide some certain basis for the structural optimization and performance improvement of the DOC+DPF system. This project will study FBC performance in the fuel quality conditions and the effect on the work process and performance of DOC+DPF system. The article main research work is as follows:(1)The two major components of the DOC+DPF system are introduced:the structure of DOC and DPF, the principle of material and filtration of DPF and the regeneration principle of DOC+DPF system. The mathematical model of DOC+DPF is established.(2) Using AVL FIRE to change inlet parameters of DOC and structure parameters to simulate the DOC of pollutant purifying efficiency and pressure drop of DOC; Also according to change inlet parameters of DPF to explore the effect for soot. It provides certain reference for DOC+DPF system structure optimization and improvement.(3)The effect of fuel additives on the performance of DOC+DPF system was studied by bench test. The test results show that the fuel additive has good stability in 50ppm diesel oil and it can reduce the balance point temperature of DOC+DPF system. It also suggests that FBC could slow down the deposition rate of PM in the DPF. Also it can shorten the regeneration time of DOC+DPF system and improve the efficiency of regeneration. |
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