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NH₃-SCR 반응기 내에서의 NH₃/NOx 및 SCR 촉매 온도가 DeNOx 성능에 미치는 영향
홍길화(Kilhwa Hong),공호정(Hojeong Gong),황인구(In Goo Hwang),박심수(Simsoo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Selective Catalytic Reduction (SCR) technology is well-known to be effective for the reduction of NOx emission. So car manufacturers has adopted Ures-SCR system to be satisfied with emission regulation. This paper discusses the effective of NH₃/NOx ratio and SCR catalyst temperature in the NH₃-SCR reactor on DeNOx performance. So it is shown the characteristic of NOx conversion and ammonia slip using the NH₃ instead of Urea-Solution. From the result of this study, it is found to optimize NH₃/NOx ratio to have the best case of high NOx conversion and low ammonia slip at variable SCR catalyst temperatures. Lastly, it is also found the characteristics of NOx conversion and ammonia slip with compared with Urea.
승용디젤엔진의 운전 조건 및 분사 조건 변경에 따른 Urea-SCR 시스템의 NOx 전환효율에 관한 연구
홍길화(Kilhwa Hong),황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.12
Selective Catalytic Reduction (SCR) system is a high-effective NOx reduction technology in diesel engines. As the emission standard of diesel engines is more stringent, vehicle manufactures makes efforts on emission technologies. This paper discusses the performance of Urea-SCR system according to the engine operating conditions in a passenger diesel engine. Engine test results in this paper show that it is important to consider the catalyst temperature and space velocity to obtain high NOx conversion efficiency. In condition of high catalyst temperature, over 90% NOx conversion efficiency is indicated. However, when catalyst temperature is low, NOx conversion efficiency was decreased. Also, it was shown that space velocity mainly effects on the DeNOx performance under 220 degree celsius of SCR catalyst temperature. As the urea injection pressure was decreased, NOx conversion efficiency was declined. It is concerned about urea droplet atomization. This work shown in this paper can lead to improved overall NOx conversion efficiency.
디젤배기모사장치를 이용한 Urea-SCR 시스템의 산소농도와 촉매온도가 DeNOx 효율에 미치는 영향
홍길화(Kilhwa Hong),한정원(Jungwon Han),황인구(In Goo Hwang),박심수(Simsoo Park),이내현(Naehyun Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, as the current and future emission regulations go stringent, the research of NOx reduction has become the subject of increasing interest and attention in diesel engine. Selective Catalytic Reduction(SCR) technology is well-known to be effective for the reduction of NOx emission. The use of SCR is becoming increasingly more popular as a cost effective way of reducing emissions from heavy duty vehicles. This paper discusses the effective of oxygen concentration and temperature in exhaust gas on DeNOx performance in Urea-SCR system. A novel urea injection system is also presented, which is based on a mass produced digital dosing pump that is combined with an electronic control unit specially developed for controlling the Urea-SCR process onboard vehicles. It is shown that it is important to have a NOx conversion with O₂ concentration and catalyst temperature. When O₂ concentration and catalyst temperature is high, Increasing the NOx conversion than low O₂ concentration and catalyst temperature.
대형디젤엔진의 NOx 저감을 위한 Urea DCU 시스템의 노즐분무 및 제어특성 평가에 관한 실험적 연구
홍길화(Kilhwa Hong),최관희(Kwanhee Choi),이형민(Hyungmin Lee),박심수(Simsoo Park),이찬(Chan Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, as the current and future emission regulations go stringent, the research of NOx reduction has become the subject of increasing interest and attention in diesel engine. Selective Catalytic Reduction(SCR) technology is well-known to be effective for the reduction of NOx emission. The use of SCR is becoming increasingly more popular as a cost effective way of reducing emissions from heavy duty vehicles. This paper discusses the visualization of Urea injection using two type nozzle for dosing a exhaust pipe with the urea solution and characterization of the DCU(dosing control unit) in Urea SCR system. We designed the two-fluid nozzle that has the duplex port to supply an air. Urea injection angle of nozzle is 18°~23° and water injection angle 16°~18°. We have tested DCU that a novel urea injection system is presented, which is based on a mass produced digital dosing pump that is combined with an electronic control unit specially developed for controlling the Urea-SCR process onboard vehicles.
디젤 엔진 Urea-SCR 시스템의 Urea Quality가 SCR 촉매의 NOx 정화효율 및 온도변화 특성에 미치는 영향
공호정(Hojeong Gong),홍길화(Kilhwa Hong),황인구(In Goo Hwang),박심수(Simsoo Park),이내현(Naehyun Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Diesel engine has advantages in point of carbon dioxide reduction than gasoline engine. But NOx from the diesel engine is still an important issue. Selective Catalytic Reduction (SCR) technology is well-known to be an effective measure for the reduction of NOx emission of diesel engine in point of fuel economy. This paper discusses NOx conversion efficiency with specified temperatures and temperature changes in different positions such as upstream, downstream and inside of the SCR catalyst. Experiment about DeNOx efficiency and temperature changes according to urea quality was fulfilled at SCR bench and light duty diesel engine test. As a result of the test, when the urea quality was dropped, the NOx conversion efficiency and temperature variation was decreased. Also, temperature variation range by the SCR reaction was decreased. It is shown that, by using temperature variation in SCR catalyst or downstream of SCR catalyst, constructing of OBD(On Board Diagnosis) system is possible.
디젤배기모사장치를 이용한 Urea-SCR 시스템의 NO/NO₂의 비율과 촉매온도가 DeNOx 효율에 미치는 영향
한정원(Jung won Han),홍길화(Kilhwa Hong),황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),이내현(Naehyun Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this research, micro thermal reactor which could control the mass flow rate and temperature of modal gases was designed to determine the optimal urea dosing location, injection control strategy for minimizing ammonia slip. To verify the high purification ratio of SCR catalyst, NO/NO₂ mixtures ratio and SCR catalyst temperature were evaluated in exhaust gas on DeNOx performance in Urea-SCR system. As a result of micro thermal reactor test, it is shown that it is important to have a NOx conversion with SCR catalyst temperature, when catalyst temperature is high, increasing the NOx conversion than low catalyst temperature. NO/NO₂ mixture ratio. The more NO/NO₂ mixture ratio was equivalent, the higher NOx conversion was acquired.
고속 PM 분석기를 이용한 디젤엔진 후처리 시스템 내의 입자상 물질 배출 거동에 관한 연구
고아현(Ahyun Ko),이형민(Hyungmin Lee),홍길화(Kilhwa Hong),민경덕(Kyoungdoug Min),박심수(Simsoo Park) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper was focused on the particulate matter (PM) behaviors from DI diesel engine and vehicle. PM from diesel engine is considered one of the sources on the air pollution and respiratory diseases. In this paper, particle behaviors were analyzed by DMS500 (Differential Mobility Spectrometer). PM was measured with commonly used operating conditions and different three sampling point on the upstream and downstream of DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter). In the vehicle test, NEDC mode (New European Driving Cycle) was applied and PM was directly measured on the tail-pipe. DOC decreases the nano-particle number, however particle mass keep the nearly same level. DPF has high filtration efficiency.