Low NOx burner assembly
AssigneeGordon-Piatt Energy Group, Inc.
InventorsAzfar Kamal, Danny L. Christenson
Life of this patent
Estimating the term…
Abstract
An improved low NOx burner assembly having a burner plate assembly which is attached to a burner head portion thereof, the burner plate assembly having a burner plate and a wrapper, the burner plate having a relatively large central aperture and a plurality of smaller apertures of several diametrical sizes disposed at selected radial positions. The burner plate, attached to the burner head portion of the burner assembly via its wrapper, partially closes the outlet end of the burner head, and flame combustion is partially contained in a premixing chamber, thus effecting prolonged contact with combustion air prior to the gas and air mixture passing through the apertures of the burner plate.
Claims19
A burner plate assembly which enables a modification of an existing gas burner assembly to reduce NOx emissions, wherein the gas burner assembly has an open burner head where a flame is formed in a combustion zone from combustion of a flammable gaseous mixture of fuel and air, and wherein the burner plate assembly comprises:
- an annular wrapper attached to the burner head as an add-on attachment;
- and
- a burner plate supported by the wrapper, the burner plate having a central aperture transverse to the passageway and a first set of apertures in a concentric arrangement to the central aperture of a selected spacing and size, furthermore a second set of apertures in concentric arrangement to the central aperture of a different selected spacing and size, wherein the burner plate, the wrapper, and the burner head form an enclosed premixing chamber where the fuel and air are mixed prior to combustion, and the mixture passes through the burner plate to the combustion zone.
A burner assembly which burns a gaseous mixture of fuel and air in a flame within a combustion zone, wherein the burner assembly comprises:
- a premixing chamber where the fuel and air are mixed to a selected stoichiometry;
- a combustion air supply assembly which provides the air to the premixing chamber;
- a gas fuel manifold which provides the fuel to the premixing chamber;
- and
- a burner plate assembly which restricts the air and fuel flow exiting the premixing chamber, wherein the burner plate assembly comprises a burner plate having a central aperture transverse to the passageway and a first set of apertures in a concentric arrangement to the central aperture of a selected spacing and size, furthermore a second set of apertures in concentric arrangement to the central aperture of a different selected spacing and size.
A low NOx forced-air burner assembly wherein a flame is formed from a combustion of air and gaseous fuel which are mixed to a desired stoichiometry upstream of a combustion zone and combusted in the combustion zone, the burner assembly comprising:
- a burner head defining an annular passageway;
- and
- a burner plate assembly attached to a distal end of the burner head substantially enclosing the passageway and forming a premixing chamber, the burner plate assembly comprising a burner plate having a central aperture transverse to the passageway and a first set of apertures in a concentric arrangement to the central aperture of a selected spacing and size, furthermore a second set of apertures in concentric arrangement to the central aperture of a different selected spacing and size, wherein the combustion air and fuel are pressurized in the premixing chamber by a back pressure imparted by the burner plate, the combustion air and fuel mixing to the desired stoichiometry and partially combusting in the pre-mixing chamber and passing through the burner plate into the combustion zone where the flame stabilizes.
Dependencies are inferred from the claim text.