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고상철(SangChul Ko),오광철(KwangChul Oh),서충길(Choong-Kil Seo),정재우(Jae-Woo Chung),김덕진(DeokJin Kim),이춘범(ChunBum Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Recently, reduction of CO and THC, as well as the DOC will be used for the regeneration of the DPF. DOC deactivated by repetitive regeneration and the deactivation progresses, depending on the conversion decrease of CO, THC and NO. The metal DOC In this study used washcoat on a metal mesh plate is raised. Deactivated rapidly up to 10 hours of hydrothermal deterioration after 25, 45 hours in the deactivation rate was reduced. Results of the TEM analysis, Pt particle size increased according to the increase of the temperature and time of hydrothermal aging, this reason is due to sintering, migration and agglomeration of Pt particles.
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.
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.
가스 환원제를 사용하는 SCR장치의 분사 노즐 형상 및 위치에 대한 수치해석
고상철(Sangchul Ko),이범호(Beomho Lee),곽용환(Yonghwan Kwak),이대엽(Daeyup Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Emission regulations for vehicles have become more stringent recently, for which SCR technology has been drawn attention in order to reduce NOx emissions. Before for exhausted gases entering SCR, the design of an injection nozzle for supplying reductant is one of the important design factors, because the uniform distribution of reductant is necessary to maximize the NOx conversion efficiency and minimize the slip of reductant through the SCR. In this work using LPG fuel(C₃H? in vapor state) as a reductant for SCR, a study of DeNOx catalyst for LPG and diesel vehicles was carried out to understand the uniformity of flow depending on the shape and position of injection nozzles. By changing the configurations of reductant injection, the uniformity of flow through a straight pipe before entering SCR filter was studied by investigating the mass fraction of C₃H? at various sectional areas and analyzed through a straight pipe and a diffuser in front of SCR filter body. In this work, no chemical reaction was considered in analysis.
고상철(Sangchul Ko),오광철(KwangChul Oh),이종인(JongIn Lee),조상현(SangHyun Cho) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Stringent emission regulations in the world are being proposed with growing concern on NOx, PM and CO2 emissions. Diesel LDV are being applied with LP-EGR and HP-EGR in order to respond to these regulation. LP-EGR rate is greater than HP-EGR rate and low temperature, reduction of NOx by low temperature combustion and high EGR rate can be effective. Exhaust gas emissions contain NOx and SOF elements, these elements condense dew point condition in intercooler by difference between exhaust gas temperature and ambient temperature, condensation water contains acid components. Condensation water contains pH 3~4 depend on the condition of the engine rpm and torque. Experiment results, Al3005 with Ti, Cr had more resistant of corrosion than other Al material and relatively less weight reduction.
Urea-SCR System의 Mixer 구조에 따른 NOx 정화율 및 유동 혼합 특성에 관한 연구
고상철(Sangchul Ko),정종화(Jong-Hwa Jeung),오광철(Kwangchul Oh),김형구(Hyeonggu Kim),이천환(Cheonhwan Lee),이춘범(Chunbeom Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Euro-6 regulations introduce stringent Oxides of Nitrogen(NOx) reduction targets for diesel engines. Reduction of NOx by Urea over catalyst has become one of the main solutions. In this study, as a way to increase the NOx reduction rate, mixer was used. There was installing Mixer to agent homogeneous urea distribution in front of the SCR catalyst to improve the Nox reduction rate between the injector and SCR. Mixer lengths, angle and fixing ring of the blade of the impact on NOx reduction rate and NOx distribution at downstream of SCR were analyzed.
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.