Claims
- 1. A burner for combusting fuel and air comprising:
- a burner block having an inlet end and an outlet end and a central opening therethrough between the ends, the burner block outlet end being in communication with an enclosure to be heated by burning fuel, and the burner block having a plurality of spaced apart recirculation gas passageways communicating with said burner block inlet, the recirculation gas passageways being at least generally paralleled to and spaced from said central opening and having an injection passageway communicating each recirculation gas passageway with said central opening, recycled gas being drawn from said burner block outlet end and recycled back into said central opening through said recirculation gas passageways and said injection passageways;
- a toroidal flame director ring positioned within said central opening in said block;
- means for injecting fuel into said burner block central opening; and
- means to move primary combustion air into said burner block central opening at said inlet end, recycled gas being mixed with primary combustion air and fuel in said central opening, the recycled gas serving to cool a flame produced at said burner block outlet end, said toroidal flame director ring serving to cause a Venturi effect to increase the flow of recycled gas.
- 2. A burner for combusting fuel and air according to claim 1 including a plurality of flame director means supported by said flame director ring oriented to cause a swirling action of gas and fuel with said burner block central opening oriented to support local primary combustion and then to cause a mixing action of gas and air passing into said central opening.
- 3. A burner for combusting fuel and air according to claim 1 including:
- said burner block has a plurality of spaced apart secondary fuel gas jet openings therein extending between said inlet and outlet ends, the secondary fuel gas jet openings being at least generally paralleled to and spaced from said central opening;
- a gas conducting conduit received in at least some of said recirculation gas passageways; and
- a fuel jet member affixed to each said gas conducting conduit and extending slightly beyond said outlet end of said burner block and having means to inject gas across said outlet end of said block.
- 4. A burner for combusting fuel and air according to claim 3 wherein said secondary fuel gas jet openings and said recirculation gas passageways are alternately spaced in at least generally paralleled relationship with each other.
- 5. A burner for combusting fuel and air according to claim 1 wherein said central opening in said block is defined by a first substantially cylindrical portion communicating with said block inlet end and a second concentric portion communicating with said block outlet end.
- 6. A burner for combusting fuel and air according to claim 5 wherein said second concentric portion of said central opening in said block is frustoconical.
- 7. A burner for combusting fuel and air according to claim 1 wherein said block has a cylindrical external surface and including:
- a tubular skirt member supported at said block inlet end concentrically with said block central opening.
- 8. A burner for combusting fuel and air according to claim 7 wherein said tubular skirt member has means to receive the inflow of combustion air under pressure.
- 9. A burner for combusting fuel and air according to claim 3 including:
- a gas manifold positioned in close proximity to and spaced from said burner block inlet end and wherein each of said fuel jet members has communication with said gas manifold.
- 10. A burner block for combusting fuel and air according to claim 1 including:
- a primary block supported concentrically within said burner block central opening, the primary block having an external dimension less than said burner block central opening and having an inlet end and an outlet end, the outlet end being substantially co-planar with said flame director ring and having a central opening therethrough;
- a liquid fuel nozzle positioned within said primary block central opening providing at least a portion of said means for injecting fuel into said burner block.
- 11. A burner for combusting fuel and air comprising:
- a burner block having an inlet end and an outlet end and a central opening therethrough between the ends, the burner block outlet end being in communication with an enclosure to be heated by burning fuel, the block having a plurality of spaced apart recirculation passageways communicating with the block outlet end, the recirculation passageways being generally paralleled to and spaced from said central opening and the burner block having an injection passageway communicating each recirculation passageway with said central opening;
- an annular flame director ring positioned within said central opening and spaced between said injection passageways and said burner block inlet end;
- a flame director supported on said flame director ring in alignment and with each said injection passageways; and
- means for injecting fuel into said burner block central opening, recycled gas being drawn through said recirculation gas passageways and injection passageways, said flame directors being oriented to cause recycled gas to whirl within said block central opening.
- 12. A burner according to claim 11 wherein said means for injecting fuel into said burner block central opening includes means of injecting gas into said injection passageways.
- 13. A burner according to claim 11 wherein said means for injecting fuel includes means of injection liquid fuel into said burner central opening from a liquid fuel nozzle positioned centrally within said central opening.
- 14. A burner according to claim 13 in which said annular flame director ring has a central opening therein concentric with but of smaller diameter than said central opening in said burner block and wherein said liquid fuel nozzle includes a diffuser cone that is substantially co-planar with said flame director ring and of external diameter less than said flame director ring central opening providing an annular air inlet space communicating with said burner block central opening that is of cross-sectional area less than said block central opening.
- 15. A burner according to claim 11 wherein said means for injecting fuel into said burner block central opening includes means wherein at least some of said recirculation passageways have a gas conduit therein; and
- a fuel jet member affixed to each said conduit and extending slightly beyond said outlet end of said block and having means to inject gas across said outlet end of said block.
- 16. A burner according to claim 11 wherein said burner block has an external cylindrical surface concentric with said circular opening, the diameter of the external surface being greater at said inlet end and smaller at said outlet end providing a circumferential ledge, and wherein at least some of said recirculation passageways communicate between said circumferential ledge and said injection passageways.
- 17. A burner block for combusting fuel and air according to claim 11 including:
- a primary block supported concentrically within said burner block central opening, the primary block having an external dimension less than said burner block central opening and having an inlet end and an outlet end, the outlet end being substantially co-planar with said flame director ring and having a central opening therethrough;
- a liquid fuel nozzle positioned within said primary block central opening providing at least a portion of said means for injecting fuel into said burner block.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part application of U.S. patent applcition Ser. No. 08/187,172 filed Jan. 26, 1994, now U.S. Pat. No. 5,458,481 and "An Improved Burner For Combusting Gas With Low NO.sub.x Production".
US Referenced Citations (11)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
187172 |
Jan 1994 |
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