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염경민(Kyoungmin Yeom),오광철(Kwangchul Oh),고상철(Sangchul Ko),이춘범(Chunbeom Lee) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
The PM deposit of exhaust gas recirculation (EGR) cooler has become a significant issue for compliance with exhaust emissions standards. EGR coolers are mainly used on diesel engines to reduce intake charge temperature and thus reduce emissions of NOx and Pariculate matter(PM). PM deposition in the EGR cooler reduces heat transfer efficiency of the cooler and increases emissions and pressure drop across the cooler. In this study, engine dynamometer using the PM deposited EGR cooler. The cooling performance experimental of EGR cooler were carried out to determine the effects of PM deposition. As the PM deposited to EGR cooler, these formed a thin deposit layer that was less heat exchange than the fresh status of tube enclosing the exhaust gas, resulting in lower heat exchange effectiveness in cooler. Also, these deposits results in decreased differential pressure of EGR cooler.
PM deposit이 EGR cooler 성능에 미치는 영향
염경민(Kyoungmin Yeom),오광철(Kwangchul Oh),고상철(Sangchul Ko),이춘범(Chunbeom Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Exhaust gas recirculation (EGR) cooler fouling has become a significant issue for compliance with nitrogen oxides (NOx) emissions standards. EGR coolers are mainly used on diesel engines to reduce intake charge temperature and thus reduce emissions of NOx and Pariculate matter(PM). PM deposition in the EGR cooler reduces heat transfer efficiency of the cooler and increases emissions and pressure drop across the cooler. An study was performed to characterize impact of PM deposition in the performance of exhaust gas recirculation(EGR) cooling devices used in the EGR systems. As the PM deposited to EGR cooler, these formed a thin deposit layer that was less heat exchange than the fresh status of tube enclosing the exhaust gas, resulting in lower heat exchange effectiveness in cooler.Also, these deposits results in decreased differential pressure of EGR cooler.
염경민(Kyoungmin Yeom),오광철(Kwangchul Oh),이종인(Jongin Lee),고상철(Sangchul Ko),이춘범(Chunbeom Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Exhaust Gas Recirculation has the advantage of being low-cost and easy to control of NOx emission. Therefore, it is most frequently used to reduce NOx. Its burden is emission and gradually increase according to strengthen . EGR cooler is mainly used on diesel engine to reduce EGR gas Temperature and increase change efficiency. Particulate Matter(PM) deposition in the EGR cooler reduces heat transfer efficiency of the cooler and increases emissions and pressure drop across the cooler. This study had performed an experiment to confirm the reduction of cooling performance by PM deposit. And confirmed the effects of PM deposit on the exhaust emission. As a result of the PM deposit 100 hours EGR cooler, the cooling performance is decreased about 25% compared to the cooling performance of Fresh cooler. Fresh cooler and Aging cooler mounted on the engine, the exhaust gas was analyzed. Aging cooler was increased compared to NOx of Fresh Cooler.
고상철(Sangchul Ko),오광철(Kwangchul Oh),염경민(Kyoungmin Yeom),김덕진(Deokjin Kim),이춘범(Chunbum Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Euro-6 exhaust gas regulation in order to satisfy most of the vehicles is expected to be equipped with DeNOx catalyst. The vanadium based extrusive-SCR of this paper simplifies the manufacturing process by plasticity after mixing with the wash-coat and substrate. V-based extrusive SCR used in this paper reduced manufacturing process about 5 steps to dramatically reduce the existing 10 step manufacturing process of coating-SCR catalyst, lowering the price, but vanadium(V₂O₃) is near to melting point at 690℃, the catalytic activity of V-based SCR catalyst was dropped due to sintering of active sites. In this paper, hydrothermal aging and compressive strength characteristics of V-based extrusive SCR were investigated.
환원제 분사 조건 변화에 따른 LNT 촉매의 De-NOx 특성
고상철(SangChul Ko),오광철(KwangChul Oh),서충길(ChoongKil Seo),김덕진(Deokjin Kim),염경민(Kyoungmin Yeom),이춘범(Chunbeom Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Nitrogen oxides act as a precursor to other toxic pollutants, such as nitric acid, which causes acid rain. For these reasons, they are subject to environmental regulations for motor vehicles. Lean-burn engines to meet these regulations are needed to reduce the amount of emitted nitrogen oxides. Therefore other types of catalytic converters are needed to reduce these types of emissions. One of these is the Lean NOx Trap (LNT) or NOx absorber catalytic converter. The LNT is operated periodically, by switching the engine from lean-burn operation to rich operation. The purpose of this paper is to understand the LNT catalyst characteristics with gasoline reductant. LNT catalyst used in the experiment is mounted on BMW Lean GDi vehicles. The experiment results of using LPG gas burner, this LNT catalyst is effected by the exhaust gas temperature, O₂ concentration in exhaust gas and the amount of reductant injection. This LNT catalyst, oxygen concentration of 2%, 4% and 6% of which 6% of the NOx storage capacity is higher and high NOx conversion rate at 350℃. NOx conversion characteristics vary with the cycle time and injection, the shorter lean period(15sec) when the high NOx conversion.
메탈 DOC+cDPE의 강제재생 온도에 따른 열화 특성
고상철(SangChul Ko),오광철(KwangChul Oh),정재우(Jae-Woo Chung),김덕진(DeokJin Kim),염경민(Kyoungmin Yeom),서충길(Choong-Kil Seo) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Diesel vehicles are considered as one of major sources of PM, recently In-use diesel vehicle and retrofit. One of the problems of the exhaust gas temperature some diesel vehicle and retrofit is too low to apply passive regeneration DPF systems. In this study it was carried out conversion efficiency test for fresh and aged catalyst on metal DOC with cDPF. Also it was evaluated the characteristics of CO, THC conversion according to aging conditions.