APPARATUS AND METHOD FOR MINIMIZING AND/OR ELIMINATING DILUTION AIR LEAKAGE IN A COMBUSTION LINER ASSEMBLY
A combustion liner assembly for a gas turbine includes an outer liner, the outer liner having a flange at a forward end. An inner liner is disposed within the outer liner. The inner liner has a first inner wall. A venturi includes a second inner wall, a venturi throat, and the first inner wall of the inner liner. A slip joint is connected to the second inner wall. The slip joint receives the flange of the outer liner. Alternatively, or additionally, the combustion liner assembly includes a slip joint between the inner or outer liner and an aft section.
The present invention relates to apparatus and methods for minimizing or eliminating dilution air leakage paths in a gas turbine combustor and particularly relates to apparatus and methods for managing dilution air leakage to achieve lower emission levels.
BACKGROUND OF THE INVENTIONSignificant products of combustion in gas turbine emissions are oxides of nitrogen, i.e., NO and NO2 collectively called NOx, carbon monoxide CO, and unburned hydrocarbons as well as other particulates. Various systems have been proposed and utilized for reducing emissions. For example, water or steam injection into the burning zone of the gas turbine combustor, catalytic clean-up of NOx and CO from the gas turbine exhaust and dry low NOx combustors have been used in the past. Compressor discharge dilution air introduced into the liner sleeve of the combustor and transition piece has also been utilized to reduce emissions.
BRIEF DESCRIPTION OF THE INVENTIONAccording to an embodiment of the invention, a combustion liner assembly for a gas turbine comprises an outer liner, the outer liner having a flange at a forward end; an inner liner disposed within the outer liner, the inner liner having a first inner wall; a venturi comprising a second inner wall, a venturi throat, and the first inner wall of the inner liner; and a slip joint connected to the second inner wall, the slip joint receiving the flange of the outer liner.
According to another embodiment of the invention, a combustion liner assembly for a gas turbine comprises an outer liner; an inner liner disposed within the outer liner, the inner liner having a first inner wall; a venturi comprising a second inner wall, a venturi throat, and the first inner wall of the inner liner; an aft section connected to aft ends of the outer liner and the inner liner; and a slip joint provided between the aft section and the inner liner.
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The inner liner 6 includes an inner wall 24 and turbulators 18 provided on an outer surface. An aft section, or gooseneck section, 20 is connected to the aft portion of the outer liner 4 and the inner liner 6. Radial drain or dump holes 22 are provided in the inner liner at an area adjacent to the aft section 20.
The combustion liner assembly 2 may be welded to a liner sleeve at areas A and B corresponding to the slip joint 16 and the end of the aft section 20, respectively. The combustion liner assembly 2 may be circumferentially welded to the liner sleeve, rather than riveted as in prior art arrangements.
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The radial drain or dump holes 22 of the embodiment shown in
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The aft end of the combustion liner assembly 2 comprises a bellows 28, as well as a slip joint 30 as disclosed in the previous embodiments.
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The combustion liner assemblies reduce, or eliminate, airflow losses in between the venturi wall and the liner wall so that airflow can be used and more evenly dispersed. Reduction, or elimination, of variance to air flow will allow more consistent air flow to be utilized in fuel air mixture in the head end combustion zone rather than leak air flow into direct “stream”. The combustion liner assemblies are relatively easy to manufacture and produce a more repeatable air flow from can to can and in turn help to create better fuel air mixture pattern than current design and lower combustion emissions. These are improvements to variation and mixing fuel air better through the mixing holes than would happen through the current design.
The combustion liner assemblies reduce, or eliminate, leaks so airflow in more non-critical areas is conserved and made more consistent, i.e. can to can variation is lowered. The combustion liner assemblies also increase airflow in useable areas in a more dispersed and even mixing through the mixing holes than would happen through current designs.
The combustion liner assemblies can be replaced in the field easily. The existing liners can be pulled out and replaced with the combustion liner assemblies disclosed herein. The combustion liner assemblies may also use current production methods and machining to produce. The combustion liner assemblies do not change the fit, form or function of the overall liner assembly.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims
1. A combustion liner assembly for a gas turbine, comprising:
- an outer liner, the outer liner having a flange at a forward end;
- an inner liner disposed within the outer liner, the inner liner having a first inner wall;
- a venturi comprising a second inner wall, a venturi throat, and the first inner wall of the inner liner; and
- a slip joint connected to the second inner wall, the slip joint receiving the flange of the outer liner.
2. A combustion liner assembly according to claim 1, further comprising an aft section provided at aft ends of the outer liner and the inner liner.
3. A combustion liner assembly according to claim 1, further comprising:
- a second slip joint connecting the aft section and the outer liner or the inner liner.
4. A combustion liner assembly according to claim 1, wherein the outer liner comprises a plurality of radial drain or dump holes.
5. A combustion liner assembly according to claim 2, wherein the aft section comprises a plurality of radial drain or dump holes.
6. A combustion liner assembly according to claim 5, wherein the aft section further comprises a plurality of axial drain or dump holes.
7. A combustion liner assembly according to claim 2, wherein the aft section comprises a plurality of axial drain or dump holes.
8. A combustion liner assembly according to claim 2, wherein the aft section comprises a plurality of holes at an intersection of a cylindrical section of the aft section and a conical section of the aft section.
9. A combustion liner assembly according to claim 1, wherein the slip joint is formed of a nickel alloy and the flange is formed of stainless steel.
10. A combustion liner assembly according to claim 1, wherein the slip joint comprises a wear coating.
11. A combustor for a gas turbine, comprising:
- a liner sleeve; and
- a combustion liner assembly according to claim 1, wherein the combustion liner assembly is welded to the liner sleeve at least at the slip joint.
12. A combustion liner assembly for a gas turbine, comprising:
- an outer liner;
- an inner liner disposed within the outer liner, the inner liner having a first inner wall;
- a venturi comprising a second inner wall, a venturi throat, and the first inner wall of the inner liner;
- an aft section connected to aft ends of the outer liner and the inner liner; and
- a slip joint provided between the aft section and the inner liner.
13. A combustion liner assembly according to claim 12, wherein the aft section further comprises a bellows.
14. A combustion liner assembly according to claim 12, wherein the outer liner comprises a plurality of radial drain or dump holes.
15. A combustion liner assembly according to claim 12, wherein the aft section comprises a plurality of radial drain or dump holes.
16. A combustion liner assembly according to claim 15, wherein the aft section further comprises a plurality of axial drain or dump holes.
17. A combustion liner assembly according to claim 12, wherein the aft section comprises a plurality of axial drain or dump holes.
18. A combustion liner assembly according to claim 12, wherein the aft section comprises a plurality of holes at an intersection of a cylindrical section of the aft section and a conical section of the aft section.
19. A combustion liner assembly according to claim 12, wherein the slip joint comprises a wear coating.
20. A combustor for a gas turbine, comprising:
- a liner sleeve; and
- a combustion liner assembly according to claim 12, wherein the combustion liner assembly is welded to the liner sleeve.
Type: Application
Filed: Apr 13, 2010
Publication Date: Oct 13, 2011
Inventors: Predrag POPOVIC (Greenville, SC), Krishna Kumar Venkataraman (Simpsonville, SC), Derrick Walter Simons (Greer, SC), Ajay Kumar Gupta (Alpharetta, GA), William Kirk Hessler (Philadelphia, PA), Jeffrey Lebegue (Simpsonville, SC)
Application Number: 12/759,042