Patent ID: 8752365

Claim:
Method for dosing a urea-based reducing agent into a gas exhaust stream generated by a combustion engine and addressed to an after-treatment system ( 30 ), said method comprises the steps of: providing a dosing module having a dosing housing ( 20 ); conveying said gas exhaust stream into said dosing housing ( 20 ); and dosing said urea-based reducing agent by generating, inside said dosing housing ( 20 ), an urea-based reducing agent spray (UWS), characterizing in that said dosing housing ( 20 ) develops along an axis (X) and in that said gas exhaust stream is annularly introduced into said dosing housing ( 20 ) by defining an axially symmetric annular inlet jet (AJ) inclined with respect to said axis (X) of said dosing housing ( 20 ), wherein the annular inlet jet (AJ) is axially symmetrical about the axis (X) along which the dosing housing ( 20 ) develops.