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US 5,299,930 AGranted
Low nox burner
AssigneeForney International, Inc.
InventorGeorge Weidman
Life of this patent
Estimating the term…
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AssigneeForney International, Inc.
InventorGeorge Weidman
Estimating the term…
In a low NOx burner, oil and gas are distributed into the combustion zone from within a central tube, surrounded by an outer tube to define an annular channel between the central tube and the outer tube. A windbox surrounds the inner and outer tubes to introduce air into the annular channel and through openings in the inner tube into the central tube. The central tube and outer tube are sized so that the velocity of air through the outer tube is substantially greater than the velocity of air flow through the inner tube to the combustion zone so that an axial recirculating air flow is generated in the combustion zone. The difference in the velocity of the air streams is maintained small enough so that minimum turbulence is generated in the combustion. The air flow paths are constructed so that no angular rotation in the air flow occurs in the combustion zone.
A low NOx burner comprising means defining a combustion zone, means to distribute fuel in fluid form into said combustion zone to be burned in said combustion zone, a central tube having an open end at said combustion zone, means defining an annular channel around said central tube, and having an open end at said combustion zone, means to cause air to flow axially through said central tube and through said annular channel with no angular flow component and with the velocity of flow in said annular channel being substantially greater than the velocity of flow in said central tube to generate axial recirculation in said combustion zone with no angular flow component, said central tube containing no obstructions affecting axial flow through said central tube and causing turbulence in said combustion zone, said annular channel containing no obstruction affecting axial flow through said annular channel and causing turbulence in said combustion zone.
A low NOx burner comprising means defining a combustion zone, means to distribute fuel in fluid form into said combustion zone to be burned in said combustion zone, a central tube having an open end at said combustion zone, means defining an annular channel around said central tube, and having an open ed at said combustion zone, means to cause air to flow axially through said central tube and through said annular channel with no angular flow component and with the velocity of flow in said annular channel being substantially greater than the velocity of flow in said central tube to generate axial recirculation in said combustion zone with no angular flow component, wherein said means to distribute fuel to said combustion zone comprises means to distribute fuel gas to said combustion zone from a circular locus surrounding the axis of said tube from within said central tube and arranged to direct said gas outwardly at an angle.
A method of burning fuel in a low NOx burner, wherein said burner comprises a central tube and an annular channel surrounding said central tube, said central tube and said annular channel having open discharge ends opening to a combustion zone, comprising the steps of causing air to flow through said central tube and through said annular channel through said open discharge ends into said combustion zone in parallel axial streams with no radial or angular components within said central tube and said annular channel adjacent to said combustion zone with the relative velocity of the stream flowing through said annular channel being sufficiently greater than the stream flowing through said central tube to cause axial recirculation in said combustion zone, and burning fuel in said combustion zone where said axial recirculation occurs.
Dependencies are inferred from the claim text.