TIER II and EURO-5/6 legislation require a high conversion level for nitrogen oxides to meet the emission levels for diesel engine. Diesel engines are difficult to simultaneously meet nitrogen oxides and particulate matter standards, because NOx and P...
TIER II and EURO-5/6 legislation require a high conversion level for nitrogen oxides to meet the emission levels for diesel engine. Diesel engines are difficult to simultaneously meet nitrogen oxides and particulate matter standards, because NOx and PM have the relation of trade-off in the diesel engine. The Urea-SCR system is a promising device to reduce NOx emissions. In condition of high catalyst temperature, over 90% NOx conversion efficiency is indicated. The key factor to implementation of SCR technology on an automobile is fast thermolysis, uniformity of ammonia and gas, and reducing ammonia slip. This paper investigate the spray characteristics of a urea injector, such as the spray angle, injection quantity, penetration length and SMD. Also Urea-SCR system has been examined in detail under various injection pressures.