The development of urea-SCR system was performed to reduce NOx emission from heavy duty diesel engines. Two candidate nozzles (1 hole and 4 hole nozzle) for urea dosing were tested with air-assisted pressures. NOx conversion ratio and NH₃ slip are t...
The development of urea-SCR system was performed to reduce NOx emission from heavy duty diesel engines. Two candidate nozzles (1 hole and 4 hole nozzle) for urea dosing were tested with air-assisted pressures. NOx conversion ratio and NH₃ slip are the main factors to choose the urea dosing nozzle. Urea dosing quantity for overall operating region was determined. NOx conversion ratio was also tested with exhaust temperature and space velocity. The performance of urea-SCR system was estimated as ESC. It was found that NOx conversion ratio is higher as the temperature before SCR catalyst is higher and the space velocity is faster within the temperature of 350℃. Approximately 84% NOx reduction was achieved in the ESC test.