Resonator ring, method and basket

Abstract

The invention relates to a resonator ring (12) for a combustor basket that has orifices (24), insertion plates (27) being connected to the ring (12) inside the orifice (24).

Description

[0001] The invention relates to a resonator ring, its manufacturing method and a combustion basket.

[0002] Cracks in holes of resonator boxes of a resonator ring can occur in combustion systems of gas turbines due to cyclic LCF loading (Low Cycle Fatigue).

[0003] Such a combustion basket is disclosed in EP 2 739 905 B1.

[0004] A resonator ring is disclosed in US2017 / 276350 A1.

[0005] It is therefore an object of the invention to solve the above-mentioned problem.

[0006] The object is achieved by a resonator ring according to claim 1, by a method according to claim 3 and by a combustion basket according to claim 5.

[0007] The respective subclaims list further advantageous measures which can be combined with each other as desired to achieve further advantages.

[0008] By locally strengthening the hole geometry of a resonator box of a resonator ring with a Y'-strengthened nickel-based superalloy, crack initiation can be avoided.

[0009] A ring for the resonator ring can be manufactured conventionally or generatively, in particular from a nickel-based wrought alloy, especially Hastelloy X or Haynes 282.

[0010] Insert plates for the hole geometry are manufactured from Y'-strengthened nickel-based superalloy for local reinforcement, in particular from In738, Alloy 247 or Rene 80.

[0011] The insert plates are made by casting.

[0012] A particularly form-fitting insertion of the insert plates into the ring is preferably carried out by welding, in particular with IN625, or preferably by soldering.

[0013] A combustion basket is then manufactured according to the state of the art, in particular by welding.

[0014] Advantages of the invention are: Avoiding crack initiation in the resonator ring, the thickness of the insert plates can be made thinner: this allows for different bore diameters, different numbers of holes and thus savings in cooling air. Longer service life and lower costs.

[0015] It shows Figure 1 shows a view of a gas turbine engine with a combustion basket, Figure 2 shows a view of a combustion basket with resonator rings according to the prior art, Figure 3 shows a resonator ring in detail, Figure 4 shows a resonator ring according to the invention, Figure 5 shows an insert plate with holes.

[0016] Figure 1 shows a view of a gas turbine engine 5. A combustion chamber 6 is located in a combustion basket 7.

[0017] Figure 2 shows a close-up view of the combustion basket 7 and a resonator ring 11.

[0018] The combustion chamber 6 produces combustion products, which are passed downstream through the combustion basket 7 and the resonator ring 11 into a transition system. From there, hot 21794311.7

[0019] Combustion products are transported downstream to a turbine section and can be used to generate electricity.

[0020] The resonator ring 11 is capable of controlling or absorbing various acoustic frequencies generated by the combustion chamber 6 during operation of the gas turbine engine 5.

[0021] Figure 3 shows a resonator ring 11 in detail, as used in a gas turbine engine 5.

[0022] The resonator ring 11 has a ring 10, preferably two interconnected rings 9, 12, which in turn can each consist of half rings.

[0023] The rings 9, 12 for the resonator ring 11 can also be made in one piece, i.e. represent a ring 10.

[0024] The ring 10 or the rings 9, 12 are preferably round or oval in cross-section to the flow direction or adapted to the combustion system.

[0025] The ring 10 or the rings 9, 12 each have a plurality of resonator boxes 21, 22 on their circumferential surface, which are preferably evenly distributed around the circumference.

[0026] The base areas of the resonator boxes 21, 22 are trapezoidal, in particular in the form of isosceles areas 15, 16, which are arranged alternately in the circumferential direction with the base side of the trapezoid facing downwards or upwards.

[0027] The areas 15, 16 are distributed around the entire circumference of the ring 10 or of the rings 9, 12 respectively.

[0028] The areas 15, 16 have almost the height of a ring 9, 10.

[0029] On the outside of the ring 10 or the rings 9, 12, around the respective areas 15, 16, there is a frame 18 corresponding to the trapezoidal area 15, 16, which, with a corresponding closing lid 23, then forms a closed box and thus represents resonator boxes 21, 22.

[0030] Within the particularly trapezoidal areas 15, 16, holes 31 are present which, in cooperation with the resonator box 21, 22, serve for damping or frequency control.

[0031] Furthermore, the resonator ring 11 described here, comprising ring 10 or rings 9, 12 and resonator boxes 21, 22, is to be improved and better manufactured according to the invention.

[0032] According to the invention, in the area according to Figure 3 , where directly in the ring 10 or the rings 9, 12 the holes 31 according to the state of the art ( Fig. 3 ) are present or designed, a complete recess 24 ( Fig. 4), which is also trapezoidal in shape.

[0033] Figure 4 stands for a ring 9 or 12 or 10 according to Figure 3 .

[0034] An insert plate 27 (Fig. 5) is inserted into this recess 24, the shape of which is complementary to the latter.

[0035] The insert plate 27 is made by casting.

[0036] The insert plate 27 is inserted into the recess 24 and connected, in particular soldered, to the ring 10, 9, 12. The insert plate 27 and ring 10 or rings 9, 12 can also have a positive connection.

[0037] The holes 31 of respective insert plates are preferably of different sizes in order to cover different frequency ranges.

[0038] The holes 31 are preferably evenly distributed within the trapezoidal area 15, 16 of the insert plate 27.

[0039] Then, in a known manner or by another procedure, the resonator boxes 21, 22 are formed from the surrounding frame 18 and the cover 23 to form the resonator boxes 21, 22.

[0040] The materials of ring 10 or rings 9, 12 and insert plates are different.

[0041] Different means that the materials differ by at least one alloying element more or at least one alloying element less and / or a proportion of at least one alloying element differs by at least 10%, in particular by at least 20%.

[0042] The material of the insert plates 27 is a Y' hardened nickel-based alloy, in particular IN738, Alloy 247 or Rene 80.

[0043] The insert plates 27 and the holes 31 are preferably made from cast plates by erosion.

[0044] Due to the higher strength of the insert plates 27, they can be made thinner and allow different bore diameters (= holes 31), thus saving cooling air.

[0045] For example, a first insert plate has all holes with a first diameter and a second insert plate has holes with a second diameter, the difference between the holes is at least 10%.

Claims

1. Resonator ring (11) for a combustor basket (7) for a gas turbine power plant (5), which has at least one ring (10, 9, 12), wherein the ring (10) or the rings (9, 12) has or have apertures (24), wherein cast insert plates (27) are connected to the ring (10) or the rings (9, 12) within the aperture (24), characterized in that the ring (10) or the rings (9, 12) is or are produced from a nickel-based wrought alloy, in particular from Hastelloy X or Haynes 282, and the cast insert plate (27) is produced from a material different from that of the rings (10, 9, 12), in particular from a Y'-strengthened nickel-based alloy, very particularly from In738, Alloy 247 or Rene 80.

2. Resonator ring according to Claim 1, in which the respective insert plates (27) have holes (31) of different sizes.

3. Method for producing a resonator ring (11) according to Claim 1, in which a ring (10) or rings (9, 12) is or are produced from a first metal, then insert plates (27) made of a, cast, second material are connected to the ring (10) or the rings (9, 12), and individual resonator boxes (21, 22) are produced, in which the insert plates (27) are produced from cast plates, in which the ring (10) or the rings (9, 12) is or are produced from a nickel-based wrought alloy, in particular from Hastelloy X or Haynes 282, in which the cast insert plate (27) is produced from a material different from that of the rings (10, 9, 12), in particular from a Y'-strengthened nickel-based alloy, very particularly from In738, Alloy 247 or Rene 80.

4. Method according to Claim 3, wherein the holes (31) in the insert plates (27) are produced by eroding plates.

5. Combustor basket having a resonator ring (11) according to one or both of Claims 1 to 2 or produced according to one or both of Claims 3 to 4.

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