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US 2003/0190570 A1Published application
Apparatus for burning fuel with low NOx formation
AssigneeJohn Zink Company
InventorsAndrew P. Jones, Danny L. Christenson
Life of this patent
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AssigneeJohn Zink Company
InventorsAndrew P. Jones, Danny L. Christenson
Estimating the term…
Improved apparatus for burning fuel with low NOx formation are provided. An apparatus of the invention for discharging a mixture of fuel gas and air into a furnace wherein the mixture is burned and flue gases having a low NOx content are formed includes the following. A burner housing, attached to a furnace, is provided having a means for mixing a first portion of the fuel gas with a first portion of the air to form a primary fuel gas-air mixture and discharging the primary fuel gas-air mixture into a primary burning zone in the furnace from at least one discharge location surrounded by a wall which extends into the furnace. A means for mixing a second portion of the fuel with a second portion of the air to form a secondary fuel gas-air mixture is also provided whereby the secondary fuel gas-air mixture is discharged into a secondary burning zone in the furnace from at least one discharge location adjacent to an exterior side of the wall. The present invention means for discharging the secondary fuel gas-air mixture causes it to discharge at a velocity whereby the secondary fuel gas-air mixture is not ignited and burned until the mixture spreads over an exterior side of the wall, mixes with flue gases in the furnace and flows beyond the wall.
An improved burner apparatus for discharging a substantially stoichiometric mixture of fuel gas and air into a furnace wherein the mixture is burned and flue gases having low NOx content are formed therefrom comprising:
The burner apparatus of claim I wherein said means connected to said housing for mixing said second portion of said fuel gas with said second portion of said air to form said secondary fuel gas-air mixture and discharging said mixture into said secondary burning zone in said furnace space comprise:
The burner apparatus of claim I which further comprises means for discharging a third portion of said fuel gas into a tertiary burning zone in said furnace from at least one third fuel gas discharge location adjacent to said secondary fuel gas-air mixture discharge location.
Dependencies are inferred from the claim text.
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Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber: for reducing…
With staged combustion in a single enclosure: with fuel supply in stages
Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber: the recirculation…
Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid: premix gas burners, i.e. in which gaseous fuel is mixed with…
Term end not estimated
1. Field of the Invention.
The present invention relates to improved burner apparatus for burning fuel gas-air mixtures whereby flue gases having low NOx content are produced.
2. Description of the Prior Art.
FIG. 1 is a partially schematic side cross-sectional view of one form of the burner apparatus of the present invention attached to a furnace wall.
FIG. 2 is a view taken along line 2-2 of FIG. 1.
FIG. 3 is a partially schematic side cross-sectional view of another form of the burner apparatus of the present invention.
Referring now to the drawings, and particularly to FIGS. 1 and 2, a low NOx formation burner apparatus of the present invention is illustrated and generally designated by the numeral 10. The burner apparatus 10 is sealingly attached to a side wall 12 of a furnace over and in an opening 13 therein. As will be understood by those skilled in the art, gas burner apparatus can be mounted vertically, horizontally or at angles without affecting the burner operation. Gas burner apparatus are commonly mounted to side walls of steam boilers and to bottom walls of process heaters.
The burner apparatus 10 is comprised of a preferably cylindrical housing 14 having a closed rearward or exterior end 16 and a substantially closed interior or forward end 18. The housing 14 is attached to the outside of the furnace wall 12 by a flange 20 attached to the housing 14 and a plurality of bolts or the like (not shown). A combustion air inlet connection 22 is attached to the rearward end 16 of the housing 14 and the discharge of a conventional combustion air blower 24 is connected to the connection 22 by a conduit 26. The air inlet of the air blower 24 is connected to an air control register 28 by a conduit or plenum 30. A conduit 32 having a flow control valve 34 disposed therein is connected to the conduit or plenum 30 at one end and to a flue gases outlet connection (not shown) attached to the furnace to which the burner apparatus 10 is attached or to a stack connected to the furnace or to another source of flue gases. A portion of the flue gases can be recirculated to the combustion air blower by way of the conduit 32, the valve 34 and the conduit or plenum 30 whereby the flue gases are mixed with the combustion air.
The forward end 18 of the housing 14 includes a base portion 36 and a wall portion 38. The wall portion 38 extends into the furnace to which the burner apparatus 10 is attached and surrounds a central area 40 of the base portion 36. The exterior side 42 of the wall portion 38 preferably slants toward the central area 40 of the base portion 36. Most preferably, the wall portion 38 has the overall form of a truncated cone as is best shown in FIG. 1.