Dual fuel low nox burner Patent #: 5240410
ApplicationNo. 908550 filed on 08/08/1997
US Classes:431/177, Annular arrangement with fuel directed on surrounding combustion chamber wall239/404, Discrete whirler means for each fluid239/405, Fluid in outer of concentrically arranged paths is whirled431/183, Row of stationary blades coaxial with disperser whirls air431/184, Pivotally adjustable blades431/284Coaxial
ExaminersPrimary: Dority, Carroll B.
Attorney, Agent or Firm
International ClassF23C 005/08
AbstractAn air premixed natural gas burner having reduced thermal and prompt NOx emissions employs a central, cylindrical core chamber and an outer annular chamber separated by a hollow barrel having a plurality of gas spuds at a front end of the burner adjacent to a burner throat. The plurality of gas spuds introduces natural gas into a core chamber air flow passing through a fixed swirler and controlled by a sliding air flow damper associated with the central, cylindrical core chamber. A reduced air/fuel stoichiometric ratio (of approximately 0.6) is preferably maintained at an outlet of the central, cylindrical core chamber. The balance of the combustion air is provided through the outer annular chamber to maintain an overall or cumulative burner stoichiometric ratio of approximately 1.05.
Field of SearchCoaxial
Spaced fuel dispersing orifices within furnace
Annular arrangement with fuel directed on surrounding combustion chamber wall
Row of stationary blades coaxial with disperser whirls air
Pivotally adjustable blades
Whirling of fluid prior to or at point of addition of second fluid
Discrete whirler means for each fluid
Fluid in outer of concentrically arranged paths is whirled
Mixing at or downstream of terminus