Urea-SCR 시스템의 DeNOx 특성에 관한 실험적 연구 (Experimental Study on DeNOx Characteristics of Urea-SCR System)

서지정보

· 발행기관 : 한국자동차공학회
· 수록지 정보 : 한국자동차공학회 논문집 / 17권 / 2호 / 180 ~ 186페이지
· 저자명 : 함운영, 정홍석, 신동현, 이성호

초록

To meet the NOx limit without a penalty of fuel consumption, urea SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal NH3 slip. In this study, as a basic research to develop an algorithm for urea injection control, the characteristics of engine out NOx emission and behavior of NOx reduction during steady-state and transient
conditions were investigated using 2L DI diesel engine. Test results show that on increasing the catalyst temperature the variations in the outlet NOx concentration are faster and maximal allowable NH3 storage exponentially decreases. For change from a low to high engine load, it can be seen that a few seconds after load-step is required to reach full NOx conversion and the adsorbed amount of NH3 at lower temperature desorb during the next temperature increase, causing NH3 slip. Engine out NOx emission needs to be corrected because NOx emissions just after step load is lower than that
of steay state condition.

영어초록

To meet the NOx limit without a penalty of fuel consumption, urea SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal NH3 slip. In this study, as a basic research to develop an algorithm for urea injection control, the characteristics of engine out NOx emission and behavior of NOx reduction during steady-state and transient
conditions were investigated using 2L DI diesel engine. Test results show that on increasing the catalyst temperature the variations in the outlet NOx concentration are faster and maximal allowable NH3 storage exponentially decreases. For change from a low to high engine load, it can be seen that a few seconds after load-step is required to reach full NOx conversion and the adsorbed amount of NH3 at lower temperature desorb during the next temperature increase, causing NH3 slip. Engine out NOx emission needs to be corrected because NOx emissions just after step load is lower than that
of steay state condition.

참고자료

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