Scr and urea nozzle system

The present invention discloses a urea SCR system and a nozzle, the nozzle is provided with a urea urea urea injection holes can be injected, said nozzle further urea can be injected with the compressed air flow nozzle, the orifice disposed in the flow urea around orifices. Urea mist ejection orifice causes eddy currents around the beam, when urea is provided around the flow orifice of the injection hole, compressed air injection nozzle beam deflector will destroy the vortex formed on the beam to be deviated fog droplets play a role diversion fog beam, the urea injection hole formed droplets will not deviate from its orbit with the vortex, but in accordance with, or substantially reducing reaction to a desired position in accordance with its predetermined orbit, thus avoiding the urea crystals produced phenomena.