3-D numerical study of effect of flow parameters upon the uniformity of NH <inf>3</inf> in Urea-SCR

Nowadays, due to the stringent engine emission norms, an efficient technique is required to reduce oxides of nitrogen (NO X) from automobiles especially from the lean burn engines. Although Urea Selective Catalytic Reduction (SCR) is capable of satisfying these norms, the ammonia slip nullifies its advantages. Ammonia slip is mainly due to the lack of uniformity of ammonia at the monolith entrance. The uniformity of ammonia distribution mainly depends upon the flow parameters of exhaust gas and the injection parameters of urea water solution. The current study addresses the effect of flow parameters, temperature and flow rate of exhaust gas on the injection pressure. The results obtained reveals useful guidelines for enhancing the uniformity of ammonia in Urea-SCR. © (2012) Trans Tech Publications.