Methods and apparatus for burning fuel with low No.sub.x formation
DCFirst Claim
1. A method of discharging an at least substantially stoichiometric mixture of fuel and air from a burner into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising the steps of:
- (a) discharging said air from said burner into said furnace space;
(b) discharging a portion of said fuel in the form of a fuel jet in a passageway in said burner communicated with said furnace space whereby flue gases in said furnace space are drawn into said passageway with said fuel;
(c) discharging said fuel and flue gases from said passageway into said furnace space whereby said fuel and flue gases mix with air and the mixture is burned in a primary reaction zone in said furnace space; and
(d) discharging the remaining portion of said fuel into a secondary reaction zone in said furnace space whereby said fuel mixes with flue gases and air contained in said furnace space and is burned in said secondary reaction zone.
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Accused Products
Abstract
Improved methods and burner apparatus are provided for discharging mixtures of fuel and air into furnace spaces wherein said mixtures are burned and flue gases having low NOx content are formed therefrom. The methods basically comprise discharging a first fuel mixture containing a portion of the fuel and flue gases from the furnace space into the furnace space whereby the mixture is burned in a primary reaction zone therein and flue gases having low NOx content are formed therefrom, and then discharging the remaining portion of the fuel into a secondary reaction zone wherein the remaining portion of fuel mixes with air and flue gases to form a second fuel mixture which is burned in the secondary reaction zone and additional flue gases having low NOx content are formed therefrom.
130 Citations
13 Claims
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1. A method of discharging an at least substantially stoichiometric mixture of fuel and air from a burner into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising the steps of:
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(a) discharging said air from said burner into said furnace space; (b) discharging a portion of said fuel in the form of a fuel jet in a passageway in said burner communicated with said furnace space whereby flue gases in said furnace space are drawn into said passageway with said fuel; (c) discharging said fuel and flue gases from said passageway into said furnace space whereby said fuel and flue gases mix with air and the mixture is burned in a primary reaction zone in said furnace space; and (d) discharging the remaining portion of said fuel into a secondary reaction zone in said furnace space whereby said fuel mixes with flue gases and air contained in said furnace space and is burned in said secondary reaction zone. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An improved burner apparatus for discharging a mixture of fuel and air into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising:
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a housing having an open end attached to said furnace space; means for introducing a controlled quantity of air into said housing and into said furnace space attached to said housing; primary fuel nozzle means disposed within said housing for discharging primary fuel into the open end of said housing and into said furnace space and for drawing cooled flue gases from said furnace space and discharging said flue gases into said open end of said housing and into said furnace space along with said primary fuel, said primary fuel nozzle means including a pressurized fuel inlet for connection to a source of pressurized fuel; flue gases passageway means disposed in said housing extending from said furnace space into said housing through which said cooled flue gases from within said furnace space are drawn and conducted to said primary fuel nozzle means; and at least one secondary fuel nozzle means attached to said housing having a pressurized fuel inlet for connection to a source of pressurized fuel for introducing additional fuel into said furnace space which mixes with flue gases and air therein.
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8. An improved burner apparatus for discharging a mixture of fuel and air into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising:
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a housing having an open end attached to said furnace space; means for introducing a controlled quantity of air into said housing and into said furnace space; fuel jet means for drawing flue gases from said furnace space and discharging fuel and flue gases into the open end of said housing and into a primary reaction zone in said furnace space adjacent thereto, said fuel jet means being attached to said housing and including a conduit for connection to a source of pressurized fuel having a fuel gas jet forming end and at least one passageway communicating said fuel jet forming end of said conduit with flue gases in said furnace space and with the interior of said housing whereby flue gases from within said furnace space are drawn into said passageway and discharged along with fuel into said housing; and at least one secondary fuel nozzle means attached to said housing for connection to a source of pressurized fuel and for introducing additional fuel into said furnace space. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification