Patent ID: 7497077
Filing Date: 2009-03-03
Classification: F01N,F02B,Y02T

Abstract:
1. A system for dispensing an aqueous urea solution into an exhaust gas stream, comprising: a source of a pressurized solution of urea and water; a source of compressed air; a first elongated tube in controlled fluid communication with said source of pressurized solution of urea and water and having a check valve disposed in a distal end of said first elongated tube; a second elongated tube in controlled fluid communication with said source of compressed air, said second elongated tube being disposed in concentrically spaced circumscribing relationship around said first elongated tube and having a distal end extending beyond the distal end of the first elongated tube thereby forming a mixing chamber between the distal end of said first elongated tube and the distal end of said second elongated tube, said distal ends of the first and second elongated tubes and said mixing chamber being wholly positioned within an exhaust conduit through which exhaust gas is discharged from a combustion chamber, and said second elongated tube having a plurality of openings therein each adapted to provide a controlled air-assisted spray of the solution of urea and water into said exhaust gas.