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IMPROVEMENT OF NOX REDUCTION RATE OF UREA SCR SYSTEM APPLIED FOR AN NON-ROAD DIESEL ENGINE
Joonsoo Han,Taemin Kim,Haksup Jung,Sukang Pyo,조규백,Youngtaig Oh,김홍석 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.6
Urea SCR technology has been widely used to reduce NOx emissions of diesel engines. Despite remarkable development for decades, more advanced control and optimization of urea SCR systems are still required as global NOx emissions standards are expected to become more stringent. This study investigated several influential parameters of urea SCR system to improve NOx reduction efficiency. This study uses a commercialized UWS (Urea Water Solution) supply system and a SCR catalyst which was installed in the exhaust line of a non-road CRDI (Common Rail Direct Injection) diesel engine. From this study, it was found that the low space velocity of SCR catalyst is essential for high NOx reduction efficiency, especially at low temperatures. Early injection of UWS enhances the overall NOx reduction efficiency if UWS injection was carefully controlled to avoid urea deposits. Rich injection of UWS with AOC is a good strategy for high NOx reduction efficiency. However, NOx reproduction in the AOC, which has an adverse effect on the overall NOx reduction rate, occurs at high exhaust gas temperatures. System insulation also can improve the NOx reduction efficiency by a few percentage points.
Tier 4 배기규제 만족을 위한 오프로드 엔진 전처리 기술 및 배출가스 특성에 관한 연구
김훈명(HoonMyung Kim),한다혜(DaHye Han),강정호(JeongHo kang),표수강(SuKang Pyo),정학섭(HakSup Jung) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Due to problems such as environmental problems caused by toxic exhaust emissions from internal combustion engines, the regulations on off-road diesel engines are being tightened and pre-processing and post-processing technology to meet the requirements of the regulations are being developed at the present. This study applied the improved turbocharger that increased the supercharged pressure of the turbocharger, which is a pre-processing technology, to identify the characteristics of the increase of the supercharged pressure. In addition, the characteristics of the emission gas based on the control of the injection timing and the EGR rates were analyzed. When equipped with the improved turbocharger, it was identified that the THC, CO and smoke decreased and the NOx was increased in comparison to the existing turbocharger. It was further identified that the NOx was reduced due to the ultimate increase of the EGR.
Off-road용 디젤엔진에서의 VGT 및 EGR 적용에 따른 엔진 배기 및 연비 특성 평가
하형수(Hyeongsoo Ha),신재식(Jaesik Shin),정학섭(Haksup Jung),표수강(Sukang Pyo),강정호(Jungho Kang) 한국연소학회 2016 한국연소학회지 Vol.21 No.2
To meet the Tier-4 emission standard, a variety of combustion technology in the field of off-road engine has been applied in conjunction with the engine after treatment technology. In this study, as the basis study for applying VGT and HPL EGR to 3.6 L CRDi engine, exhaust gas characteristics and fuel economy characteristics are confirmed in accordance with VGT and EGR operating conditions. Consequently, in the EGR applicable conditions, 60% VGT vane duty condition was confirmed that the trade-off characteristics between NOx and smoke are advantageous. In addition, in view of BSFC, VGT vane duty is considered desirable to control at around 50%.
56kw 오프로드 디젤엔진 인터쿨러 장착에 따른 배출가스 특성에 관한 연구
김훈명(HoonMyung Kim),한다혜(DaHye Han),강정호(JeongHo kang),표수강(SuKang Pyo),정학섭(HakSup Jung) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The off-road vehicles generally use diesel engines, that have lats of particulate matter(PM) and nitrogen oxide(NOx) when burned in an engine. And what"s more the emission NOx by increase as engine efficiency increases. In this paper, the combustion and emission characteristics of intake air temperature use 56kW off-road engine install intercooler at full road and non-road transient cycle mode. measure the engine performance and emission amount due to a variety of efficiency. and analyzing those matters.
Off-Road 기계식 디젤엔진의 EGR Map 적용에 따른 배출가스 특성 연구
김훈명(HoonMyung Kim),강정호(JeongHo Kang),한다혜(DaHye Han),하형수(HyeongSoo Ha),표수강(SuKang Pyo),안중규(JuengKyu Ahn) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.8
최근 대기환경 개선에 대한 관심이 대두되면서 화석연료를 사용 하는 기관에 대한 배출가스 저감연구가 활발하게 진행 되고 있다. 본 연구는 이러한 저감 기술 중 NOx를 저감하기 위해 가장 많이 적용 되고 있는 EGR system을 Off-road 기계식 디젤엔진에 적용하였을 때 나타나는 배출가스 특성을 파악하기 위하여 진행되었다. EGR system 적용을 위하여 먼저 엔진의 운전영역에 대한 배출가스 특성을 파악하였고, 각각의 엔진회전수 조건에서 다양한 EGR 조건을 적용하여 NOx 저감을 위한 최적 EGR 율을 도출하였다. 이에 따라 수정된 EGR 맵 적용 조건의 엔진 배기 특성에 대해 NRTC 모드를 구현하여 EGR 미적용 조건 및 기존 맵과 비교 및 고찰하였으며, 그 결과로 EGR 미적용 조건 대비 NOx가 약 42% 저감됨을 보였다. Because reducing atmospheric pollution is becoming a serious issue, studies are actively focusing on exhaust gas reduction. This study was conducted to determine the emission characteristics when applying an EGR system, the main approach used for NOx reduction, to an off-road mechanical diesel engine. For the application of the EGR system, the emission characteristics in consideration of the engine conditions were analyzed. The optimum EGR ratio for NOx emission reduction was determined by applying variable EGR conditions for each engine speed condition. Considering the above process, the emission characteristics of the modified EGR condition are compared with those of other conditions (non-EGR and existing EGR condition) in the NRTC mode. Consequently, NOx emission was reduced by around 42 compared with the non-EGR condition when using the modified EGR map.
다구찌 기법을 이용한 Off-road 디젤 엔진 배기가스 특성의 강건 설계에 관한 연구
안중규(Juengkyu Ahn),정진은(Jineun Chung),강정호(Jeongho Kang),하형수(Hyeongsoo Ha),박찬수(Chansu Park),표수강(Sukang Pyo) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper deals with the robust design of the diesel engine on off-road. In order to this, the measurement of the NOx and PM emission based on the design of experiment using the orthogonal table was carried out and the control factors for exhaust using the small-the-better SN ratio with the Taguchi method were evaluated. The ANOVA for SN ratio was conducted. The injector hole number, ignition timing and EGR rate were selected as the control factors. The orthogonal table L9(3³) was made of 2 or 3 levels for each factor and the measurement of emission was accomplished on the base of the table. The injection timing on the NOx emission and the EGR rate on the PM emission affect the largest effect. A result of the analysis of variance to this, the injection timing of the experiments for PM emission is significant with 90% confidence level. And, in other situations, it is clarified that it is significant with 95%.