Combustion chamber arrangement for operating a gas turbine

• US 8,479,524 B2
• Filed: 11/25/2009
• Issued: 07/09/2013
• Est. Priority Date: 11/25/2008
• Status: Expired due to Fees

• Current Assignee: Ansaldo Energia IP UK Limited (Ansaldo Energia SPA)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Poyyapakkam, Madhavan Narasimhan, Magni, Fulvio, Ince, Nadir
• Primary Examiner(s): Gartenberg, Ehud
• Assistant Examiner(s): SUTHERLAND, STEVEN M
• Application Number:
  US12/625,793
• Publication Number:
  US 20100126184A1
• Time in Patent Office: 1,322 Days
• Field of Search: 607/52, 607/54, 607/55, 607/56, 607/57, 607/96, 607/99, 608/00, 607/97, 608/04, 277/416
• US Class Current: 60/797
• CPC Class Codes: F23R 2900/00012 Details of sealing devices
• CPC Class Codes: F23R 3/002 Wall structures F23R3/02 and F23R3/007 take precedence
• CPC Class Codes: F23R 3/08 between annular flame tube sections, e.g. flame tubes with telescopic sections

Abstract

A combustion chamber arrangement is described for operating a gas turbine, with a combustion chamber wall which encloses the combustion chamber space and in the region of the combustion chamber outlet encloses a flow passage for hot gases which develop inside the combustion chamber, has a combustion chamber wall edge which freely terminates in the axial flow direction of the hot gases. The combustion chamber wall edge is formed with a profile which blocks or at least inhibits a diffuser effect when a cooling air flow, which is guided axially through the flow passages into the annular spatial area, flows over the combustion chamber wall edge.

Claims

1. A combustion chamber arrangement for a gas turbine comprising:

a combustion chamber wall, which encloses a combustion chamber space for hot gases which develop inside the combustion chamber;

the combustion chamber wall having an aft combustion chamber which freely terminates in an axial flow direction of the hot gases, the combustion chamber wall axially overlapping and radially spaced within a hot gas housing with a radial clearance between the combustion chamber wall and the hot gas housing;

an annular seal, wherein the combustion chamber wall is completely encompassed in the circumferential direction by the annular seal which comprises a plurality of individual sealing segments which on an end face side are joined to each other in each case via connecting structures, on one side axially indirectly or directly adjoining the hot gas housing and with the outer-side combustion chamber wall delimited by axially oriented flow passages which on one side lead into an annular spatial area radially delimited by the axially mutually overlapping combustion chamber wall and hot gas housing;

a plurality of collar-like fasteners indirectly or directly attached to the hot gas housing, the collar-like fasteners projecting upstream over the hot gas housing, arranged in a distributed manner in the circumferential direction of the hot gas housing, and attached to the annular seal on an outer side on the combustion chamber wall upstream to the aft combustion chamber wall edge; and

the aft combustion chamber wall edge formed with a profile which blocks or at least inhibits the hot gases in the combustion chamber space from flowing radially outward into the annular spatial area, the profiling of the combustion chamber wall edge is a bevel with a bevel surface which faces the hot gas housing, the bevel angled at an angle α

, where α

=40°

±

10°

.

2. The combustion chamber arrangement as claimed in claim 1, wherein the collar-like fasteners are incorporated in the circumferential direction on the outer side around a flange wall which is connected to the hot gas housing upstream.

3. The combustion chamber arrangement as claimed in claim 2, wherein the flange wall is connected to the hot gas housing via a releasable or non-releasable connection which extends in the circumferential direction of the hot gas housing.

4. The combustion chamber arrangement as claimed in claim 2, wherein the individual sealing segments have a longitudinal extent which is oriented in the circumferential direction of the combustion chamber wall and a curvature adapted to the combustion chamber wall, the connecting structures of each individual sealing segment, which are provided in each case on the end face in the longitudinal extent, are formed in such a way that the connecting structures of two interconnected sealing segments in each case provide mutually overlapping and contacting surface sections in the form of a labyrinth seal at least in the circumferential direction.

5. The combustion chamber arrangement as claimed in claim 4, wherein the labyrinth seal which exists between two sealing segments has a step contour with a step section which is oriented in the circumferential direction, and the step section which is oriented in the circumferential direction, between all the sealing segments which are attached around the combustion chamber wall and interconnected in pairs in each case, is overlapped in axial projection by the wall thickness of the hot gas housing.

6. The combustion chamber arrangement as claimed in claim 4, wherein the labyrinth seal which is provided between two sealing segments has a step contour with a step section which is oriented in the circumferential direction, and the step section which is oriented in the circumferential direction, between all the sealing segments which are attached around the combustion chamber wall and interconnected in pairs in each case, is overlapped in axial projection by the wall thickness of the flange wall.

7. The combustion chamber arrangement as claimed in claim 2, wherein in the region of the flange wall a multiplicity of radially oriented through-passages are formed and arranged in a distributed manner in the circumferential direction around the flange wall in such a way that a cooling air flow which is directed through the through-passages penetrates into the annular spatial area between the flange wall and the combustion chamber wall.

8. The combustion chamber arrangement as claimed in claim 1, wherein the sealing segments are joined to each other in pairs in each case via the connecting structures.