Method and combusting fuel and burner therefor

Patent metadata

Field	Value
Publication number	US-10101025-B2
Application number	US-201314654284-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Dec 19, 2012
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

Method and burner for combusting a main fuel with a main oxidizer, whereby flows of the main fuel and the main oxidizer are injected via an injector end, comprising at least one metallic injector, said injector end being positioned in the upstream section of a main passage of a refractory block and whereby multiple jets are injected into the downstream section of the main passage to increase mixing and turbulence of the flows of the main fuel and the main oxidizer.

First claim

What is claimed is:

1. A method of combusting fuel with oxidizer by means of a burner comprising a main injector assembly and a refractory burner block, whereby
the main injector assembly terminates in an injection end which comprises at least one metallic injector,
the block comprises a main passage bordered by a surrounding passage surface and extending along an axis from a cold face of the block to a hot face of the block opposite the cold face,
the main passage defines a main injection direction X parallel to the axis and has an upstream section adjacent the cold face and a downstream section downstream of the upstream section and adjacent the hot face, said downstream section terminating in a main injection opening in the hot face of the block, and
the injection end of the main injector assembly is positioned in the upstream section of the main passage so that the upstream section surrounds the at least one metallic injector,
a flow of main fuel and flow of main oxidizer are injected according to main injection direction X towards and into the downstream section of the main passage by means of the injector end of the main injector assembly, characterized in that:
the burner block further comprises multiple auxiliary passages terminating in the downstream section via n auxiliary openings in the surrounding surface of the main passage, whereby n≥2 and
n jets of agitating gas are injected into the downstream section via the n auxiliary openings so as to interact with the flow of main fuel and the flow of main oxidizer and to increase turbulence and mixing thereof.

2. The method of claim 1 , whereby the n jets of agitating gas are injected so as to decrease the momentum of the flow of main fuel and the flow of main oxidizer in the main injection direction X.

3. The method of claim 1 , whereby the n auxiliary openings are positioned in axial symmetry around the axis.

4. The method of claim 1 , whereby:
the n agitating gas jets are directed towards the axis, or
the n agitating gas jets are injected according to a same sense of rotation around the axis.

5. The method of claim 1 , whereby the agitating gas jets are injected according to an injection direction forming an angle of between 30° and 105° with the main injection direction X, preferably between 45° and 105° , more preferably between 45° and 105°, and most preferably between 65° and 85°.

6. The method of claim 1 , whereby the refractory block is a refractory ceramic block or a refractory metallic block.

7. The method of claim 1 , whereby the agitating gas is selected from: a substantially inert gas, a secondary oxidizer and a secondary gaseous fuel.

8. The method of claim 1 whereby:
at least part of the main fuel is injected around the main oxidizer, or
least part of the main oxidizer is injected around the main fuel.

9. A burner comprising a metallic injector assembly and a refractory burner block,
the injector assembly comprising an injection end and terminating in at least one metallic injector,
the block comprising a main passage bordered by a surrounding surface and extending along an axis from a cold face of the block to a hot face of the block opposite the cold face,
the main passage having a longitudinal axis, an upstream section adjacent the cold face and a downstream section adjacent the hot face and downstream of the upstream section, said downstream section terminating in a main injection opening in the hot face of the block,
the injection end of the injector assembly being positioned in the upstream section of the main passage for injecting fuel and oxidizer towards and into the downstream section of the main passage said upstream section surrounding the at least one metallic injector,

characterized in that:
the burner block further comprises multiple auxiliary passages for transporting an agitating gas through the burner block and for injecting agitating gas jets into the downstream section of the main passage, the multiple auxiliary passages terminating in the downstream section of the passage through n auxiliary openings in the surrounding surface of the main passage, with n≥2, the multiple auxiliary passages being positioned and oriented so that, in operation, the n agitating gas jets injected via said n auxiliary openings interact with the main fuel and the main oxidizer injected by the injector assembly inside or downstream of the downstream section so as to generate increased turbulence and mixing of the main fuel with the main oxidizer.

10. The burner of claim 9 , whereby the n auxiliary openings are evenly distributed around the longitudinal axis.

11. The burner of claim 9 , whereby the multiple auxiliary passages are positioned and oriented so that, in operation, the n agitating gas jets are injected via said n auxiliary openings:
with injection directions directed towards the longitudinal axis, or
with injection directions presenting a same sense of rotation around the axis.

12. The burner of claim 9 , whereby the multiple auxiliary passages are positioned and oriented so that, in operation, the n agitating gas jets are injected via said n auxiliary openings with injection directions forming an angle of between 30° and 105° with the main injection direction X, preferably between 45° and 105°, more preferably between 60° and 105°, and most preferably between 65° and 85°.

13. The burner of claim 9 , whereby the injection end of the injector assembly comprises an oxidizer injector and a fuel injector, whereby the injection end of the injector assembly preferably comprises (a) an oxidizer injector which surrounds a fuel injector or (b) a fuel injector which surrounds an oxidizer injector.

14. The burner of claim 9 , whereby the refractory block is a refractory ceramic block or a refractory metallic block.

15. The furnace comprising at least one burner of claim 9 , said burner being mounted in a furnace wall so that the hot face of the burner block faces a combustion zone of the furnace and so that the cold face of the burner block faces away from the combustion zone.

Assignees

• Air Liquide
• Air Liquide

Inventors

• Berhaut Paul
• Grand Benoit
• Laurent Jacky
• Mulon Jacques
• Paubel Xavier
• Recourt Patrick
• Tsiava Remi Pierre

Classifications

• F23D14/32

  using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air (F23D14/38 takes precedence) · CPC title

• F23D14/16

  using permeable blocks · CPC title

• F23D14/70

  Baffles or like flow-disturbing devices · CPC title

• F23D1/04 Primary

  Burners producing cylindrical flames without centrifugal action · CPC title

• F23D14/64

  with injectors · CPC title