Experimental and CFD Analysis of Selective Catalytic Reduction System on DeNOx Efficiency of Single Cylinder Diesel Engine Using NH3 as a Reducing Agent

NOx is the major pollutant coming out from diesel engine which needs to be minimized using innovative technologies. It has been found that SCR system with Urea or NH3 as a reducing agent is a promising approach to reduce NOx emission in order to meet the stringent limits on emission standards. In the current work NH3 flow rate has been varied from 0.2 kg/hr to 0.8 kg/hr and injected on to the exhaust gas coming out from the diesel engine, which in turn enters inside SCR catalyst, where it will undergo various reactions to convert NOx into free Nitrogen (N2). It has been found that 56% of NOx conversion is achieved with NH3 flow rate of 0.6 kg/hr. But for 0.8 kg/hr NH3 flow rate, it shows lower conversion, due to desorption of NH3 from walls of monolith and sintering effect. The simulation work has been carried out using CFD code AVL FIRE for validation purpose. It has been found that the experimental and simulation results are in close agreement with each other.