Diesel particulate trap (DPF) is a filter installed in the exhaust system of diesel engines. It can capture black smoke particulate matter (PM) before it enters the atmosphere. Its filtration efficiency can reach more than 95%, with soluble organic components. Usually, the particulate matter is burned to eliminate the particulate matter in order to achieve regeneration.inquiry
Diesel particulate trap (DPF) is widely used in the elimination of black smoke particles in the exhaust of off-road internal combustion engines such as diesel engine vehicles, diesel generator sets and various construction machinery.
According to the different materials of the catalyst substrate, DPF can be divided into the ceramic base (cordierite, silicon carbide and aluminum titanate) and metal base;
According to the gas circulation form, it can be divided into: wall-flow (WF-DPF), half flow (partial flow) (PF-DPF), and direct flow (FT-DPF).
DPF with or without precious metal coating and CPDF with precious metal coating.
The wall-flow particle trap has a high filtering effect, but the exhaust back pressure is relatively large; the semi-flow particle trap adopts a combination of filtration and straight-through design, with low back pressure, high filtering effect and long service life; Direct-flow particle traps are inexpensive and have very low back pressure, but the filtering effect is average.
The working principle of the wall-flow particulate trap: By alternately blocking both ends of the pores of the honeycomb porous ceramic, the wall pores of the ceramic are used to filter and remove PM. When the trap has accumulated a certain amount of particulate matter, the system will perform a regeneration process to remove the trapped particulate matter.
The working principle of the semi-flow type (partial flow type) particulate trap: through the multi-fold and non-blocking channel, it can capture most of the particulate matter (PM). Because the surface of the carrier is coated with a catalyst, the particulate matter collected in the pores ( PM) is oxidized to carbon dioxide (CO2), and it can also catalyze the oxidation of co and HC.
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