Combustor arrangement with slidable multi-cone premix burner

Patent metadata

Field	Value
Publication number	US-9933163-B2
Application number	US-201313937574-A
Country	US
Kind code	B2
Filing date	Jul 9, 2013
Priority date	Jul 10, 2012
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A combustor arrangement includes a combustion chamber with a front panel, and a premix burner of the multi-cone type, which is connected to the front panel through an elongated mixing zone in an axially moveable fashion by a sealed sliding joint. A wide range of axial variation of the burner with a minimized influence of the leakage air flow on the oxidation process within the flame is achieved by positioning the sealed sliding joint upstream of the mixing zone.

First claim

What is claimed is:

1. A combustor arrangement, comprising:
a combustion chamber with a front panel, and
a premix burner of a multi-cone type, which is connected to said front panel through an elongated mixing zone in an axially moveable fashion by a sealed slidable joint,
wherein said sealed slidable joint is positioned upstream of said mixing zone,
wherein the sealed slidable joint is made up by a coaxial sliding arrangement of a cylindrical burner ring and an essentially cylindrical burner sleeve, the essentially cylindrical burner sleeve defining an axial direction and a radial direction perpendicular to said axial direction,
wherein said burner ring is fixed to said premix burner and said burner sleeve is fixed to and part of said front panel, and a seal is located between said burner ring and said burner sleeve in the radial direction, and
wherein the seal is arranged to be slidable, in the axial direction, along and against a surface of the burner ring or the burner sleeve during relative movement of the burner ring and the burner sleeve such that the entirety of the seal is located within the essentially cylindrical burner in the radial direction and circumferentially surrounds the burner ring.

2. The combustor arrangement according to claim 1 , wherein said burner ring is surrounded by said burner sleeve.

3. The combustor arrangement according to claim 2 , wherein said burner ring extends upstream of the downstream end of the burner, and the seal is positioned at the upstream end of the burner ring.

4. The combustor arrangement according to claim 1 , wherein the burner sleeve has a conically widening burner outlet at the transition to said combustion chamber.

5. The combustor arrangement according to claim 3 , wherein the burner sleeve includes purge air holes downstream of the seal to purge the gap between burner ring and burner sleeve with air.

6. The combustor arrangement according to claim 1 , wherein said premix burner comprises:
a plurality of burner shells, which are arranged around a central burner axis and are parts of a virtual, axially extending common cone, which opens in a downstream direction, and
wherein said parts are displaced perpendicular to said burner axis such that a tangential slot is defined between each pair of adjacent shells, and
wherein each of the shells is equipped with a premix gas channel extending along an axially oriented edge of the respective shell such that a gas can be injected from said premix gas channel through gas injection holes into a stream of air entering the interior of the arrangement of shells through the adjacent slot, and
wherein the downstream ends of the shells and premix gas channels are bordered by intersecting planes, which are defined by intersecting said shells and premix gas channels with a virtual coaxial cylinder of a predetermined radius, and
wherein said burner ring has an inner radius similar to said predetermined radius.

7. A combustor arrangement, comprising:
a combustion chamber with a front panel; and
a premix burner of a multi-cone type, which is connected to said front panel through an elongated mixing zone in an axially moveable fashion by a sealed slidable joint;
wherein said sealed slidable joint is positioned upstream of said mixing zone;
wherein the sealed slidable joint is made up by a coaxial sliding arrangement of a cylindrical burner ring and an essentially cylindrical burner sleeve;
wherein said burner ring is fixed to said premix burner and said burner sleeve is fixed to and part of said front panel, and a seal is provided between said burner ring and said burner sleeve; and
wherein the seal, the burner ring and the burner sleeve are arranged and configured such that the seal axially will slide along and against a surface of the burner ring or the burner sleeve during any axial relative movement of the burner ring and the burner sleeve such that the seal is located on a radially inner surface of the essentially cylindrical burner and on a radially outer surface of the burner ring.

8. The combustor arrangement according to claim 7 , wherein said burner ring is surrounded by said burner sleeve.

9. The combustor arrangement according to claim 8 , wherein said burner ring extends upstream of the downstream end of the burner, and the seal is positioned at the upstream end of the burner ring.

10. The combustor arrangement according to claim 7 , wherein the burner sleeve has a conically widening burner outlet at the transition to said combustion chamber.

11. The combustor arrangement according to claim 9 , wherein the burner sleeve includes purge air holes downstream of the seal to purge the gap between burner ring and burner sleeve with air.

12. The combustor arrangement according to claim 7 , wherein said premix burner comprises:
a plurality of burner shells, which are arranged around a central burner axis and are parts of a virtual, axially extending common cone, which opens in a downstream direction, and
wherein said parts are displaced perpendicular to said burner axis such that a tangential slot is defined between each pair of adjacent shells, and
wherein each of the shells is equipped with a premix gas channel extending along an axially oriented edge of the respective shell such that a gas can be injected from said premix gas channel through gas injection holes into a stream of air entering the interior of the arrangement of shells through the adjacent slot, and
wherein the downstream ends of the shells and premix gas channels are bordered by intersecting planes, which are defined by intersecting said shells and premix gas channels with a virtual coaxial cylinder of a predetermined radius, and
wherein said burner ring has an inner radius similar to said predetermined radius.

Assignees

• Alstom Technology Ltd
• Ansaldo Energia Switzerland AG

Inventors

• Pasqualotto Ennio
• Schiessel Pirmin
• Jaan Hellat

Classifications

• F23R3/286 Primary

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• F23C7/002

  the air being submitted to a rotary or spinning motion (cyclonic combustion chamber F23C3/006) · CPC title

• F23C2900/07002

  Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners · CPC title

• F23C5/06

  Provision for adjustment of burner position during operation · CPC title

• F23C15/00

  Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass {(for generating combustion products of high pressure or high velocity F23R7/00; starting devices F23D11/42)} · CPC title