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이종선(Jong Sun Lee),이성욱(Seang Wock Lee),최정황(Jung Hwang Choi),백두성(Doo Sung Baik),최연수(Yeon Soo Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Urea-SCR system has been known so far to one of effective aftertreatment for the reduction of NOx. In order to achieve an better performance in SCR system, optimal geometric conditions for a urea injection system should be achieved. This research focused to evaluate characteristics of urea spray injected SCR system of a heavy duty diesel engine by applying visualization techniques. The experiment was conducted by varying injection pressure and flow rates of urea and its flow visualization was made by photographing techniques of CCD camera. This investigation may provide with fundamental data in future.
선택적 환원촉매장치(SCR)에 의한 대형 디젤기관의 NOx 저감에 관한 연구
이원석(Won Seok Lee),김대용(Dae Yong Kim),이성욱(Seang Wock Lee),강호인(Ho In Gang),강금원(Keum Won khang),최정황(Jung Hwang Choi),김종춘(Jong Chun Kim),박용희(Yong Hi Park),김민수(Min Su Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines are excellent at thermal efficiency and less amount of CO₂ emission than gasoline engines. However, PM and NOx from exhaust gas is the biggest problem of diesel engines. SCR system is known as the best method to reduce NOx. SCR system is classified into three types, NSR, NH₃-SCR and HC-SCR. Urea-SCR, the most stable among three types, is usually used since NSR and NH₃-SCR have the problem of poisoning by sulfur and the difficulty in treating dangerous gas. However, NH₃ slipped by over-injecting urea as a reductant will become a serious problem since slipped NH₃ is the second pollutant. This work considers optimizing the amount of urea injection to minimize the second pollutant. This work on urea system to reduce NOx also analyzes factors influenced on reducing NOx and conducts the chemical and or mechanical inquiry about the fundamental operating principle and the reduction method of Urea-SCR system in the experiment. The control system of urea injection is also designed available in an actual diesel vehicle on chassis dynamometer. From the pre-mechanism, the duration of injection is given by the amount of NOx at the maximum torque point(1500 rpm) and ND-13 mode similar to actual driving pattern. This work confirms the installation of SCR system may not affect engine performance since engine power, torque and sfc change within only 5%, even if the SCR system is applied or not. This work presents the fundamental data to coincide with EURO Ⅳ and Ⅴ enforced from 2008 with SCR system.