선택적 환원촉매장치(SCR)에 의한 대형 디젤기관의 NOx 저감에 관한 연구 = A Study on NOx Reduction of a Selective Catalytic Reduction(SCR) System in a Heavy-Duty Diesel Engine

다국어 초록 (Multilingual Abstract)

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.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험장치 및 실험방법
• 3. 결과 및 고찰
• 4. 결론
• References