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DPF 특성이 강제재생시 DPF 내부온도에 미치는 영향에 관한 연구
박찬엽(Chanyoub Park),최형수(Hyungsu Choi),심우찬(Woochan Sim),이홍철(Hongchul Lee),김경운(Kyungwoon Kim),천승호(Sungho Cheon),한대곤(Daegon Han) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The effect of DPF characteristics, such as material and cell density, on the internal temperature of DPF during active regeneration was investigated by using DPF test rig. DPF was regenerated by direct fuel injection into the exhaust gas in the upstream of DOC and exhaust gas in front of DPF was heated up to 650℃ by controlling the quantity of injected fuel. Because thermal conductivity of SiC DPF is superior to that of cordierite DPF, radial thermal gradient and maximum DPF temperature of SiC DPF was much lower than those of cordierite DPF during active regeneration in case of the same soot loading and cell density condition. However, the difference of cell density in SiC DPF had little effect on thermal properties during active regeneration. That means that the material of DPF is a key factor to influence thermal properties of DPF during regeneration.
디젤유 후분사시 촉매특성이 HC slip 저감에 미치는 영향에 관한 연구
심우찬(Woochan Sim),최형수(HyungSu Choi),이홍철(Hongchul Lee),정동훈(Donghoon Jeong),김경운(Kyungwoon Kim),한대곤(Daegon Han) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
One method of burning soot within DPF is catalytic fuel burner which utilizes catalyst’s hydrocarbon (HC) oxidation performance. In this method, exhaust temperature can be raised the level to more than 600 degree by injecting diesel fuel in front of DOC. Because injected diesel fuel can’t be completely combusted by DOC and unburned HCs are formed during incomplete combustion of diesel fuel, HC concentration behind DOC during diesel fuel dosing tends to increase. Increased HC concentration during diesel fuel injection varies with exhaust temperature and can be reduced by applying catalyzed DPF. So, the effect of PGM loading on DPF and exhaust temperature on HC slip during diesel fuel dosing was experimentally investigated. The results from this study show that higher exhaust temperature and catalyzed DPF can significantly reduce HC slip behind DPF. It is also shown that the key to reduce HC slip is not the quantity of PGM loading but applying PGM loading on DPF.
DOC 전단에 디젤유 분사시 배기가스 물성치 변화에 대한 연구
심우찬(Woochan Sim),최형수(HyungSu Choi),이홍철(Hongchul Lee),정동훈(Donghoon Jeong),김경운(Kyungwoon Kim),한대곤(Daegon Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
One method of burning soot within DPF is catalytic fuel burner which utilizes hydrocarbon(HC) oxidation performance by catalyst. In this method, exhaust temperature can be raised the level to more than 500 degree by injecting diesel fuel in front of DOC. Because injected diesel fuel cannot be completely combusted by DOC and unburned HC are formed during incomplete combustion of diesel fuel, HC concentration behind DPF during diesel fuel dosing tends to increase. HC concentration behind DPF can be reduced by applying additional DOC behind DPF. Thermal efficiency of dosing diesel fuel tends to reduce when flow rate increases. NO₂/NOx ratio decreases during fuel dosing because catalyst reaction rate of HC is faster than that of NO. The position of diesel fuel injection is the important factor of thermal efficiency because that can improve the dispersion of diesel fuel in exhaust gas.
심우찬(Woochan Shim),김정식(Jeongsik Kim),정재욱(Jaewook Jeong),이홍철(Hongchul Lee),김경운(Kyungwoon Kim),한대곤(Daegon Han) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
To meet Tier-4 regulation for off-road diesel engines, diesel particulate filter(DPF) is the best solution. Because there are enormous driving conditions for off-road vehicles, active DPF system should be applied to regenerate DPF at low load driving conditions. Newly developed SiC DPF has the merit of good resistance to oxidation which is useful during active regeneration. Filtering efficiency of SiC DPF was evaluated through ISO-8178-C1 mode. Combustion of trapped soot by using diesel burner was performed at various operating condition to check if newly developed SiC DPF is suitable for active regeneration. The durability of SiC DPF was investigated through thermal cycle durability test. It was found that newly developed SiC DPF has excellent filtering efficiency and thermal durability. This means that newly developed SiC DPF has enough performance to be applied for off-road diesel engines.
김정식(Jeongsik Kim),심우찬(Woochan Shim),정재욱(Jaewook Jeong),이홍철(Hongchul Lee),김경운(Kyungwoon Kim),한대곤(Daegon Han) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
To meet stringent diesel particulate matter regulations, diesel particulate filter(DPF) is the best solution. Passive type DPF system is not able to regenerate for low load driving conditions. Therefore, this system is required to forcibly burn the particulate held in the DPF. One effective method of active DPF regeneration is to burn soot by using diesel burner. Although active diesel burner is useful tool to regenerate DPF, there are shortcomings related to ignition. Because ignition is seriously affected by oxygen density which varies with engine load, it is important to know the effect of oxygen density on ignition. In this study, it was found that oxygen density is a main key to start ignition and should be more than 15% for normal ignition of active diesel burner.