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암모니아 수용액(Urea) 분사 맵 구성을 위한 SCR 촉매특성 및 NOx 저감효과에 관한 연구
남대우(Daewoo Nam),강정호(Jeongho Kang),정건우(Gunwoo Jeong),김용태(Youngtae Kim),김태민(Taemin Kim),이해수(Haesoo Lee),김상훈(Changhee Kim),김창희(NaeHyun Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In order to form the basic map for the urea mass flow rate in Urea-SCR system, DOC/DPF and SCR was installed, then injection test was performed at various engine conditions. First of all, pre-map was comprised from the result of the space velocity and the NO₂/NOx ratio. As the result of experiment, it is shown that the NO₂/NOx ratio and the active region of SCR catalyst according to exhaust temperature have largely effect on forming the map of urea mass flow rate. And, in the case of increasing NH3/NOx ratio, NOx conversion is improved, but the NH₃ slip occurs according to increasing NH₃/NOx ratio, which is the factor to limit the region of the urea mass flow rate as well. Then, in case to inject the urea following the map, NOx is decreased about 65%. Although different aspects are shown due to many effect like high temperature, space velocity, NO2/NOx ratio, it is expected to satisfy emission standard EURO-V through the optimization of urea mass flow rate.