Air premixed natural gas burner
Patent 5807094 Issued on September 15, 1998. Estimated Expiration Date: 
August 8, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 8, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2335188 2822864 Dual fuel low nox burner Patent #: 5240410 InventorApplicationNo. 908550 filed on 08/08/1997US 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 blades431/284CoaxialExaminersPrimary: Dority, Carroll B.Attorney, Agent or FirmInternational ClassF23C 005/08AbstractAn 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 SearchCoaxialSpaced 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 | |
