Conversion Efficiencies of Urea -SCR System for Mahua Methyl Ester Fuelled DI Diesel Engine

Stringent emission regulations on diesel-powered vehicles and some of biodiesel emissions have led to development of new technologies to reduce emission of nitrogen oxides (NO ). Out of the choices available, X Selective Catalytic Reduction (SCR) has shown to be the most promising exhaust after-treatment system for reducing oxides of nitrogen in the near term in-use applications. SCRs use the ammonia containing compound urea, as a reducing agent. This paper describes an experimental investigation of Urea-SCR,which has been designed for comparing efficiency of the SCR system for diesel and biodiesel. For this study, a SCR exhaust system was tested on a steady state, direct injection Kirloskar single cylinder diesel engine. Mahua Methyl Ester (MME) oil has used as a biodiesel. From the experimentation, it was concluded that the conversion efficiencies were higher for diesel comparable to biodiesel. The analysis also shows the Urea SCR system has a maximum of 93.4% NO conversion efficiency of diesel fuel. For biodiesel, maximum NO conversion efficiency XX of Urea-SCR was approximately 49%. This experimentation also revealed that the Urea-SCR system hasan excellent HC conversion efficiency at all engine loads and using both fuels.