A Research on the Filtration and Regeneration of Fuel Borne Catalyst Diesel Particulate Filter of Diesel Engine
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Research on the PM filtration efficiency of a fuel borne catalyst regenerative type diesel particulate filter(FBC-DPF) is conducted,and the effectiveness of fuel borne catalyst(FBC) in a CA6DL1-28 diesel engine is studied.The back-pressure of DPF increases linearly along with accumulation of the particulate matter(PM).Addition of a fe-based fuel borne catalyst in diesel fuel can lower the temperature for soot combustion,and increase the storing capacity of the DPF and have regeneration ability.For the fresh DPF,operation for 19.5 h in certain condition leads to 10 kPa backpressure when using the diesel fuel,while using the FBC-added diesel fuel can extend to the period of 23.5 h.Regeneration time is largely shortened by using FBC-added diesel fuel at the exhaust temperature of 530 ℃ comparing with that of diesel fuel.After 500 h operation,it takes 18.5 h to get the backpressure of 15 kPa with diesel fuel and 23 h with FBC-added diesel fuel.Evaluating by ESC 13 procedures,the trapping efficiency of DPF in PM is over 80%,and PM emission is 0.017 g/(kW·h).No adverse impact on CO,HC,NOx emissions was observed with the DPF.Keywords:
Diesel exhaust fluid
Winter diesel fuel
Filtration (mathematics)
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This paper give a LPG (Liquefied Petroleum Gas) burning regeneration DPF(Diesel Particulate Filter), which the filter bodies of both the DPF were made of winded metal mesh, to fit for the high sulfur diesel. The DPF were re-designed and optimized according to a long time bus installation in-situ experiments. The LPG burning regeneration DPF could trap the most part of the particulate matter (PM) (85% at maximum) and did not have noticeable effect on engine performance. Development of performance external LPG heating regenerative devices can be completed within 20 minutes DPF regeneration. It is cheap, good durability, a high degree of confidence. Because they do not use the catalyst can be regenerated, so it can be used in high-sulfur diesel.
Liquefied petroleum gas
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Test bench
Diesel exhaust fluid
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The trapping, loading and regenerating behaviors of a non-coated SiC diesel particulate filter(DPF) were investigated experimentally on a CA6DL2-35E3 high pressure common rail heavy-duty diesel engine with the fuel borne catalyst(FBC) added into the used 0# diesel fuel. The results show that the particulate trapping efficiency was up to 90% under the ESC-13 test cycle using low sulfur Euro4 0# diesel fuel. During the regeneration process the temperature at DPF outlet position was the highest near the central axis, being the thermal stress concentration area. According to the ESC condition weight distribution and the feasible regenerative condition range, the weight ratio between the regenerative and non-regenerative conditions is much higher than the ratio between the limit regenerative time and loading time. This implicates the DPF with FBC can regenerate reliably. The particulate loading in DPF causes EGR change obviously, so the DPF/FBC technology is suitable for the technical route of EGR coupled with DPF for the Euro4 diesel engine.
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Diesel exhaust fluid
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Combined technique of burner and DOC has been used for regeneration of Diesel Particulate Filter. Experiments has been performed to increase the temperature of engine exhaust gas to burn the collected soot in DPF at all conditions of operation of 3 liter diesel engine. Ignition temperature of soot can be successfully obtained by heats of burner flame and residual fuel oxidation at diesel oxidation catalyst even in the condition of oxygen deficiency. It is found that the load of air compressor and heat loss can be reduced to the level of practical application. It is also found that CO and THC emissions are not increase by additional combustion of regeneration burner.
Diesel exhaust fluid
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Fixing Diesel Particulate Filter (DPF) in diesel is an effective measure to solve the particulate emissions. As PM is accumulated in DPF constantly, it will increase diesel exhaust resistance and affect diesel performance. Through building the exhaust resistance test rig and diesel test bench, the thesis studies the effects of particulate matter loading in DPF on diesel exhaust resistance and diesel performance. The results show that it is the most effective to conduct silicon carbide filter’s thermal regeneration when particulate matter loading is 8g/L.
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The trapping and regeneration behaviors of a diesel particulate filter (DPF), including particle size, are examined via engine dynamometer testing. The exhaust system consists of two active lean NO x (ALN) catalysts in series followed by a catalyzed DPF. Forced regenerations are accomplished by injecting diesel fuel into the exhaust in front of the ALN catalysts to generate an exotherm sufficient to induce soot oxidation. Results are reported for two diesel fuels, one with 340 ppm sulfur, and the other with 4 ppm sulfur, and as a function of DPF regeneration temperature. The results show the DPF to be very effective at removing particulate matter, >99% efficiency. The <1% of particles that escape trapping exhibit a size distribution very similar to engine out soot. During regeneration, particle emissions remain well below engine out levels for the low sulfur fuel, but exhibit a temporary nucleation mode of about ten times the engine out level for the high sulfur fuel. The regeneration rate increases exponentially with temperature, and the fastest regenerations suffer the lowest fuel economy penalty.
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