Burner arrangement with deflection elements for deflecting cooling air flow

Patent metadata

Field	Value
Publication number	US-9157637-B2
Application number	US-201113219185-A
Country	US
Kind code	B2
Filing date	Aug 26, 2011
Priority date	Aug 27, 2010
Publication date	Oct 13, 2015
Grant date	Oct 13, 2015

Abstract

An exemplary burner arrangement and method for operating a burner arrangement are disclosed. During operation of the burner arrangement a hot combustion gas, including combustion air, flows essentially parallel to a burner wall through a mixing chamber, which is delimited by the burner wall, to a combustion chamber. In the mixing chamber the hot combustion gas is mixed with an injected fuel, where cooling air from the outside of the burner wall flows through effusion holes in the burner wall into an interior of the mixing chamber. The cooling air, on the outside of the burner wall, is deflected in a directed manner in its flow direction by means of deflection elements which are in a distributed arrangement.

First claim

What is claimed is:

1. A method for operating a burner arrangement, comprising:
flowing a hot combustion gas, including combustion air, parallel to a burner wall through a mixing chamber, which is delimited by the burner wall, to a combustion chamber;
mixing the hot combustion gas with an injected fuel in the mixing chamber;
feeding a cooling air along the burner wall; and
arranging a perforated plate with holes on the outside of the burner wall and at a distance from said burner wall, and introducing the cooling air on a side of the perforated plate which faces away from the burner wall, and deflecting the cooling air with deflection elements into the holes of the perforated plate and towards the burner wall, wherein each of the deflection elements are arranged on the outside of the perforated plate over an inlet of at least one of the holes of the perforated plate; and
flowing the cooling air from outside of the burner wall through effusion holes in the burner wall into an interior of the mixing chamber, and wherein the effusion holes extend through the burner wall from a side facing the perforated plate to a side of the wall facing the hot combustion gases.

2. The method as claimed in claim 1 , wherein the cooling air, on the outside of the burner wall, has a velocity component which is parallel to the burner wall, and the cooling air is deflected towards the burner wall.

3. The method as claimed in claim 2 , wherein the deflection elements each cover an individual effusion hole; and
deflecting cooling air into each of the individual effusion holes.

4. The method as claimed in claim 3 , wherein the effusion holes are inclined by their axes to the burner wall; and
deflecting the cooling air by the deflection elements such that upon entry into the effusion holes, the cooling air flows parallel to the axes of the effusion holes.

5. The method as claimed in claim 3 , wherein the effusion holes are inclined by their axes to the burner wall; and
deflecting the cooling air by the deflection elements such that upon entry into the effusion holes the cooling air flows essentially perpendicularly to the burner wall.

6. The method as claimed in claim 2 , wherein the deflection elements each cover a plurality of effusion holes; and
deflecting cooling air into the plurality of effusion holes.

7. The method as claimed in claim 1 , wherein the cooling air, on the outside of the burner wall, has a velocity component which is parallel to the burner wall, and the static pressure of the cooling air upstream of the deflection element is increased.

8. The method as claimed in claim 1 , wherein the deflection elements are half spherical half-shells, which shield the associated effusion holes from one side and are open in the direction of the inflowing cooling air.

9. The method as claimed in claim 1 , comprising:
feeding the cooling air opposite to the flow direction of the combustion gases.

10. The method as claimed in claim 1 , wherein an inside of the burner wall and an outside of the burner wall are parallel to each other.

11. A burner arrangement, comprising:
a mixing chamber which extends in a flow direction, wherein the mixing chamber is delimited on an outside surface by a burner wall, upstream has an inlet for a hot combustion gas which contains combustion air, and to which a combustion chamber is connected downstream, wherein the mixing chamber includes a fuel lance for injecting fuel, the fuel lance projecting into the mixing chamber, and wherein the burner wall is provided with effusion holes through which cooling air, which is fed along the burner wall and introduced on the outside of the burner wall, and flows into the mixing chamber; and
a perforated plate with holes arranged on the outside of the burner wall and at a distance from said burner wall, and wherein a plurality of deflection elements are arranged on a side of the perforated plate which faces away from the burner wall such that cooling air is deflected by a plurality of deflection elements, each of the plurality of deflection elements arranged over an inlet of at least one of the holes of the perforated plate to deflect the introduced cooling air towards said burner wall and into each of the effusion holes, and
wherein the effusion holes extend through the burner wall from a side facing the perforated plate to a side of the wall facing the hot combustions gases.

12. The burner arrangement as claimed in claim 11 , wherein the plurality of deflection elements are designed such that the cooling air is deflected towards the burner wall.

13. The burner arrangement as claimed in claim 11 , wherein each of the plurality of deflection elements is associated with one of the effusion holes.

14. The burner arrangement as claimed in claim 13 , wherein the effusion holes are inclined by their axes to the burner wall, and the deflection elements allow the cooling air, upon entry into the effusion holes, to flow essentially parallel to the axes of said effusion holes.

15. The burner arrangement as claimed in claim 13 , wherein the effusion holes are inclined by their axes to the burner wall, and the deflection elements allow the cooling air, upon entry into the effusion holes, to flow essentially perpendicularly to the burner wall.

16. The burner arrangement as claimed in claim 11 , wherein each of the plurality of deflection elements is associated with a plurality of effusion holes.

17. The burner arrangement as claimed in claim 11 , wherein the deflection elements are half spherical half-shells, which shield the associated effusion holes from one side and are open in the direction of the inflowing cooling air.

18. The burner arrangement as claimed in claim 11 , wherein an inside of the burner wall and an outside of the burner wall are parallel to each other.

Assignees

• Poyyapakkam Madhavan
• Eroglu Adnan
• Ciani Andrea
• Lauffer Diane
• Ruedel Uwe
• Alstom Technology Ltd

Inventors

• Poyyapakkam Madhavan
• Eroglu Adnan
• Ciani Andrea
• Lauffer Diane
• Ruedel Uwe

Classifications

• F23R2900/03341

  Sequential combustion chambers or burners · CPC title

• F23R3/002

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F23R3/346 Primary

  for staged combustion · CPC title

• F23R2900/03045

  Convection cooled combustion chamber walls provided with turbolators or means for creating turbulences to increase cooling · CPC title

• F23R2900/03041

  Effusion cooled combustion chamber walls or domes · CPC title