Pulverized fuel-oxygen burner

Patent metadata

Field	Value
Publication number	US-9752777-B2
Application number	US-201314372309-A
Country	US
Kind code	B2
Filing date	Sep 5, 2013
Priority date	Sep 5, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A burner assembly combines oxygen and fuel to produce a flame. The burner assembly includes an oxygen supply tube adapted to receive a stream of oxygen and a solid fuel conduit arranged to extend through the oxygen tube to convey a stream of fluidized, pulverized, solid fuel into a flame chamber. Oxygen flowing through the oxygen supply tube passes generally tangentially through a first set of oxygen-injection holes formed in the solid fuel conduit and off-tangentially from a second set of oxygen-injection holes formed in the solid fuel conduit and then mixes with fluidized, pulverized, solid fuel passing through the solid fuel conduit to create an oxygen-fuel mixture in a downstream portion of the solid fuel conduit. This mixture is discharged into a flame chamber and ignited in the flame chamber to produce a flame.

First claim

The invention claimed is:

1. A burner assembly for combining fuel and oxygen to produce a combustible fuel-oxygen mixture, the burner assembly comprising:
a solid fuel conduit having a longitudinal axis in the longitudinal direction, said solid fuel conduit formed to include a fuel transport passage for transporting fluidized, pulverized solid fuel, said solid fuel conduit defining an inlet opening for receiving the fluidized, pulverized solid fuel, said inlet opening having a cross-sectional area;
said solid fuel conduit further defining a fuel-oxygen nozzle, said fuel-oxygen nozzle having a side wall and said fuel-oxygen nozzle formed to include a fuel-oxygen transport passage, a fuel inlet opening located to admit the fluidized, pulverized solid fuel from the fuel transport passage into the fuel-oxygen transport passage, and a fuel-oxygen outlet opening located to discharge a fuel-oxygen mixture into a flame chamber;
a primary oxygen conduit located about said fuel-oxygen nozzle, said primary oxygen conduit formed to include a primary oxygen inlet and a primary oxygen passage;
a first plurality of oxygen injection nozzles located in said side wall of said fuel-oxygen nozzle and configured to admit oxygen from said primary oxygen passage into said fuel-oxygen nozzle in a direction substantially orthogonal to said longitudinal axis in the longitudinal direction to mix with the fluidized, pulverized solid fuel in the fuel-oxygen transport passage and to establish a combustible fuel-oxygen mixture flowing in the fuel-oxygen transport passage and exiting through the fuel-oxygen outlet opening; and
an oxygen distribution ring located within said primary oxygen passage between said primary oxygen inlet and said first plurality of primary oxygen injection nozzles, said oxygen distribution ring defining a plurality of apertures in fluid communication with said primary oxygen inlet and said first plurality of primary oxygen injection nozzles.

2. The burner assembly of claim 1 wherein said first plurality of primary oxygen injection nozzles is configured to admit said oxygen from said primary oxygen passage into said fuel-oxygen nozzle in a direction substantially tangential to said side wall of said fuel-oxygen nozzle.

3. The burner of claim 2 further comprising a second plurality of primary oxygen injection nozzles located in said sidewall of said fuel-oxygen nozzle, said second set of oxygen injection nozzles configured to admit oxygen from said primary oxygen passage into said fuel-oxygen transport passage in a direction having a component tangential to said side wall of said fuel-oxygen nozzle and a component radial to said side wall of said fuel-oxygen nozzle.

4. The burner of claim 3 wherein said first plurality of primary oxygen injection nozzles is upstream of said second plurality of primary oxygen injection nozzles.

5. The burner of claim 3 wherein said first plurality of primary oxygen injection nozzles is downstream of said second plurality of primary oxygen injection nozzles.

6. The burner assembly of claim 1 wherein said first plurality of primary oxygen injection nozzles is configured to admit said oxygen from said primary oxygen passage into said fuel-oxygen nozzle in a direction having a component tangential to said side wall of said fuel-oxygen nozzle and a component radial to said side wall of said fuel-oxygen nozzle.

7. The burner assembly of claim 1 further comprising:
a volume displacement member positioned within said solid fuel conduit, said volume displacement member and said solid fuel conduit together defining an annular flow region, a portion of said annular flow region having a first cross-sectional area substantially equivalent to said cross-sectional area of said inlet opening of said solid fuel conduit.

8. The burner assembly of claim 7 wherein a further portion of said annular flow region proximate said fuel-oxygen nozzle has an increasing cross-sectional area compared to said first cross-sectional area.

9. The burner assembly of claim 7 wherein a further portion of said annular flow region proximate said first plurality of primary oxygen injection nozzles has a second cross-sectional area greater than said first cross-sectional area.

10. The burner assembly of claim 1 further comprising:
an additional oxygen distribution ring located in said primary oxygen passage between said oxygen distribution ring and said first plurality of primary oxygen injection nozzles, said additional oxygen distribution ring defining a plurality of apertures in fluid communication with said primary oxygen inlet and said first plurality of primary oxygen injection nozzles.

11. The burner assembly of claim 1 further comprising:
a secondary oxygen conduit located about said primary oxygen conduit, said secondary oxygen conduit formed to include a secondary oxygen inlet and a secondary oxygen passage;
a secondary oxygen ring defining at least one aperture, said at least one aperture in fluid communication with said secondary oxygen passage and said flame chamber.

12. The burner assembly of claim 11 wherein said secondary oxygen ring has an axis and said at least one aperture of said secondary oxygen ring has an axis parallel to said axis of said secondary oxygen ring.

13. The burner assembly of claim 11 wherein said secondary oxygen ring has an axis and said at least one aperture of said secondary oxygen ring has an axis converging with said axis of said secondary oxygen ring.

14. The burner assembly of claim 1 further comprising a nozzle sweep ring, said nozzle sweep ring defining at least one slot in fluid communication with said primary oxygen passage and said flame chamber.

15. A burner assembly for combining fuel and oxygen to produce a combustible fuel-oxygen mixture, the burner assembly comprising:
a solid fuel conduit having a longitudinal axis in the longitudinal direction, said solid fuel conduit formed to include a fuel transport passage for transporting fluidized, pulverized solid fuel, said solid fuel conduit defining an inlet opening for receiving the fluidized, pulverized solid fuel, said inlet opening having a cross-sectional area;
said solid fuel conduit further defining a fuel-oxygen nozzle, said fuel-oxygen nozzle having a side wall and said fuel-oxygen nozzle formed to include a fuel-oxygen transport passage, a fuel inlet opening located to admit the fluidized, pulverized solid fuel from the fuel transport passage into the fuel-oxygen transport passage, and a fuel-oxygen outlet opening located to discharge a fuel-oxygen mixture into a flame chamber;
a primary oxygen conduit located about said fuel-oxygen nozzle, said primary oxygen conduit formed to include a primary oxygen inlet and a primary oxygen passage;
a first plurality of oxygen injection nozzles located in said side wall of said fuel-oxygen nozzle and configured to admit oxygen from said primary oxygen passage into said fuel-oxygen nozzle in a direction substantially orthogonal to said longitudinal axis in the longitudinal direction to mix with the fluidized, pulverized solid fuel in the fuel-oxygen transport passage and to establish a combustible fuel-oxygen mixture flowing in the fuel-oxygen transport passage and exiting through the fuel-oxygen outlet opening;
a first oxygen distribution ring located within said primary oxygen passage between said primary oxygen inlet and said first plurality of primary oxygen injection nozzles, said first oxygen distribution ring defining a plurality of apertures in fluid communication with said primary oxygen inlet and said first plurality of primary oxygen injection nozzles; and
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Assignees

• Honeywell Int Inc

Inventors

• Taylor Curtis
• Patterson Brad
• Perdue Jayson

Classifications

• F23D2201/00

  Burners adapted for particulate solid or pulverulent fuels · CPC title

• F23L7/007 Primary

  Supplying oxygen or oxygen-enriched air · CPC title

• F23D2201/20

  Fuel flow guiding devices · CPC title

• F23D1/00

  Burners for combustion of pulverulent fuel · CPC title

• F23C2201/20

  Burner staging · CPC title