EP1507117A1 - Combustion chamber, in particular gas turbine combustion chamber - Google Patents

Abstract

The gas turbine combustion chamber has tiles whose outer surfaces contact the hot gases. These are mounted on support plates, a single bolt (37) at the corners simultaneously holding several tiles (26A - 26D) in place. An independent claim is included for gas turbines fitted with the combustion chamber.

Description

The invention relates to a combustion chamber for a gas turbine, the combustion chamber wall inside a number of heat shield bricks which essentially covers the whole area arranged side by side and attached to a support structure are, each heat shield brick facing the support structure Cold side and one of the cold side opposite, having a hot medium acted upon hot side.

Such a combustion chamber with a combustion chamber lining goes For example, from DE-A 362 50 56. Such heat shield reinforced Support structures are used in a variety of ways, For example, as a flame tubes or hot gas channels in Incineration plants such. B. gas turbine plants. Appropriate heat shield reinforced supporting structures emerge DE 117 37 34, DE 252 34 49 C3 and the DE 362 50 56 A1.

According to DE 117 37 34, the heat-resistant Combustion lining (heat shield) made of profiled Stones having grooved flanks, wherein every stone between at least two holders, in the grooves engage, is clamped. The holders have tabs on, under the paved stone on the support structure rest and are firmly connected to this. According to the DE 362 50 56 A1, the stones are provided with bevelled flanks and lie directly on the front of thermal stress to be protected supporting structure. They are attached with metallic Brackets of trapezoidal cross section, the inserted in V-shaped column between two stones and by means of screws or the like against the support structure be tense.

As possibly disadvantageous to the Hitzschild according to the It should be pointed out in DE 117 37 34 that one of the support structure Keep away from hot fluid to flow under the heat shield can, because the stones are necessarily spaced from the Support structure must be arranged, and that also the Thermal changes caused by thermal stress Spring force holder is not sufficiently taken into account can be. An underflow of the heat shield with Hot fluid can possibly damage the support structure to lead. An incomplete consideration of the Changes in the spring force holder under thermal stress can be used to loosen the stones at high thermal Load or excessive mechanical stress on the Lead stones at low thermal stress. The heat shield Although according to DE 362 50 56 A1 does not involve any danger by undercurrent, since the heat shield forming stones lie directly on the support structure; the metallic one Fasteners of the heat shield are however immediate exposed to the hot fluid and limit the thermal Resilience of the heat shield, or require special Cooling measures.

Another type of lining of a thermally highly loaded Combustion chamber is specified in EP 0 558 540 B1. In this a heat shield is disclosed on a support structure which Heat shield has a variety of stones, which are essentially areally arranged side by side and with metallic holders are attached to the support structure, wherein each stone has a cold side resting on the supporting structure, one of the support structure facing away from the hot side and at least has two flanks, each of which is the cold side with the Hot side connects and their each assigned at least one holder is that the flanks with a grip tab at least partially overlaps. Here is the support structure with grooves provided, each of which two mutually opposite groove walls has a groove bottom and a groove opening, and that each holder on a fastening tab which is approximately at right angles to the Gripping tab is aligned, is fastened in a groove.

The invention is based on the observation that the above ceramic heat shields due to their necessary Flexibility in terms of thermal expansion often insufficient for mechanical loads, such as shocks and vibrations, are secured. Furthermore, when using the heat shield stones in a combustion chamber for lining a combustion chamber wall during assembly or Maintenance work takes a considerable amount of time due to the difficult to access attachment to record.

The invention is therefore the object of a Indicate combustion chamber for a gas turbine, which improved Having heat shields, especially against the above requirements of higher operational safety guaranteed with less maintenance. Another The object of the invention is to specify a gas turbine with a such combustion chamber.

The task directed to a combustion chamber is according to the invention solved by a combustion chamber for a gas turbine, whose Combustor wall inside a number of heat shield bricks which, in essence, cover each other side by side arranged and attached to a support structure, each heat shield brick facing the support structure Cold side and one of the cold side opposite, with a has hot medium acted upon hot side, wherein a Heat shield stone and a neighboring heat shield stone by at least one common fastening bolt on the Support structure are attached.

With the invention, a completely new way is shown, a Combustion chamber with heat shields against high accelerations due to shocks or vibrations permanently too secure and at the same time the need-based exchange of individual To enable heat shield stones during maintenance work. The invention already starts from the knowledge that Heat shield stones, as they are usually used for lining a Combustor wall can be used by stationary and / or transient vibrations in the combustion chamber wall appropriate vibrations are excited. In doing so, especially in a case of resonance, high accelerations occur above a limit acceleration, the heat shield stones stand out from the combustion chamber wall and in the Follow up again. Such a markup on the massive Combustor wall leads to very high forces on the heat shield stones and can cause great damage to these to lead. This leads to a significant reduction of Durability of a heat shield stone in the combustion chamber. In the worst case, at such an impact of the heat shield stone to break, causing immediate danger is that the fragments separate from each other and in reach the combustion chamber. Smaller or larger Fragments in the combustion chamber may result in components in the sequence Significantly damage the combustion chamber. Especially when used Such a combustion chamber with heat shield stones in one Gas turbine can thereby the downstream turbine one suffer considerable damage.

With the invention, the risk of detachment from Fragments from a heat shield stone, in particular from a ceramic material is significantly reduced. At the same time advantageously the mountability and the Disassembly of individual heat shield stones on the Support structure greatly facilitated what for Service business is of great importance. In which proposed attachment concept is a heat shield brick and an adjacent heat shield brick by at least a common fastening bolt on the support structure attached. A single fixing bolt attached and at the same time ensures at least two heat shields, namely a heat shield stone and a neighboring one Heat shield block.

This is the first time a bolt attachment for Heat shields suggested that opposite the For example, from EP 0 558 540 B1 known Clamping a heat shield block with a number of Clamps, especially with regard to the assembly effort clear is superior. In addition, with the attachment concept of Invention increases the passive safety of the combustion chamber, since a heat shield stones with a continuous crack in the Heat shield stone is not lost. One in this way with heat shields lined combustion chamber has in Case of special occurrences about emergency running characteristics, so that consequential damage, such as blading one of the Combustion turbine downstream turbine to be avoided can. Economically, this also results in the Advantage that normally no extraordinary maintenance and / or revision of a heat shield bricks having Combustion chamber is required. The combustion chamber with a such lining of heat shield stones can at least operated with the usual maintenance cycles, but In addition, an extension of the service life due to the increased passive safety is achievable. For maintenance work are advantageously individual combustion chamber stones on especially easy way by loosening the corresponding fastening bolts interchangeable, resulting in the conventional clamping of Hitzeschildsteinen only under considerable effort under Disassembly of whole rows of heat shield stones - in particular even those who are not at all waiting for an exchange - take place can.

In a particularly preferred embodiment, the heat shield stones each designed as a polygon, with a common Mounting bolt is positioned at a corner. With the polygon geometry is a nationwide lining the combustion chamber with heat shield stones possible, in one Corner a plurality of heat shield stones border each other and thus are arranged adjacent to each other. With the Common mounting bolts on a corner can be a bolt at the same time a large number of adjacent heat shield stones attach the support structure in the desired position and hold.

In a particularly preferred embodiment, the heat shield stones thereby designed as triangles or squares, the by a common fastening bolt positioned at a corner attached to the support structure. At a area coverage with squares can be a fixing bolt, which is arranged at a corner is four at the same time Heat shield elements in the corner adjacent to each other are arranged secure. The corner fastening of heat shield stones with a respective fastening bolt is included particularly advantageous in terms of ease of installation or disassembly, at the same time before falling out possible fragments, especially in comparison to the already discussed, known clamp fasteners. Heat shield stones in the form of triangles, in particular of equilateral triangles, are also special favorable for an area-wide lining of the combustion chamber with one in the corners of the heat shield stones positioned fastening bolts. By the equilateral Triangles are related to a sixfold rotational symmetry realized on a vertex, that is with a Fastening bolts are at the same time six adjacent Heat shield stones attached and permanently in operation secured.

Preferably, for dismantling a heat shield stone of Mounting bolts accessible and detachable from the hot side. Thus, during a maintenance or revision of the combustion chamber a heat shield brick from inside the firebox room by detachment of the fastening bolt or a corresponding Number of fixing bolts securing the heat shield brick be replaced.

In this case, the fastening bolt preferably has a in axial direction of the mounting bolt normal to the hot side in cross section widening bolt head, preferably with a Pickup for a mounting tool, on. By being in the Cross-section expanding bolt head is one Fail-safe for by means of the fastening bolt Given the supporting structure attached heat shield bricks. Furthermore, the widening cross section of the Bolt head for increased passive safety in case a crack or fracture of a heat shield stone, for example, as a result of a shock load. Depending on Dimensioning of the cross section and the course of the expanding bolt head, one can be expected to the Loading situation of the heat shield block in the combustion chamber adapted constructive design of the fastening bolt and the heat shield bricks to be attached are realized.

So is preferably in the mounted state of the bolt head in corresponding recesses of adjacent heat shield stones lowered. The corresponding recesses of adjacent Heat shield stones complement each other to a closed, For example, in cross-section circular, recess in the the bolt head is lowered. By lowering the Bolt head is a secure positioning and mounting the reached adjacent heat shield bricks, the bolt head with the neighboring heat shields in the area of Recess comes into contact. The lowering of the bolt head also provides some extra protection of the Bolt head against too massive admission with Hot gas during operation of the combustion chamber is.

The countersunk bolt head preferably closes flush with the Hot side surface of heat shield stones. This will a flat surface through the area-wide arranged side by side and attached to the support structure heat shield stones realized what the flow guidance properties of Hot gas and the heat protection function of the heat shield stones realized heat shield again increased.

In a particularly preferred embodiment, the fastening bolt a conical or truncated cone designed bolt head on. The cone shape is in view to the simple production of fastening bolts especially advantageous since lathes are used here can. The conical shape or truncated cone shape is due to the Symmetry of the conical surface also with regard to Load distribution due to the holding forces of the bolt head especially against the heat shield stone to be kept Cheap.

Preferably, the fastening bolt is made of metal. Come here High temperature resistant materials such as high temperature resistant Steels or metal alloys on nickel or Cobalt base, in question.

Preferably, the fastening bolt against a spring force in slidable axial direction of the fastening bolt. Of the Heat shield brick is thereby heat-movable on the support structure anchored by means of the fastening bolt, wherein the Compensation of the different thermal expansions, the due to different thermal expansion coefficients of Materials arise, the fastening bolt against the Spring force in the axial direction of the fastening bolt is displaceable. The anchoring is preferably carried out the inner lining of the combustion chamber facing away from the wall Supporting structure. For this purpose, the support structure has at least one Wall on, through which at least one end portion of the Extending bolt extends.

At the end portion of the bolt engages in a preferred embodiment a spring element, preferably a compression spring.

According to another preferred embodiment, it is proposed that the compression spring the end portion of the fastening bolt surrounds.

Preferably, at the end portion of the fastening bolt arranged a holding element, wherein the holding element is an abutment forms for the spring element. By positioning of the retaining element and design of the spring element can thus a desired holding force can be guaranteed to a Secure the heat shield element over the fastening bolt.

The object directed to a gas turbine is achieved according to the invention solved by a gas turbine with a combustion chamber, the Having heat shield stones, according to the above are attached.

The advantages of such a gas turbine arise accordingly the above comments on the combustion chamber.

The invention will be described below by way of example with reference to FIG Drawing explained in more detail.

FIG 1

einen Halbschnitt durch eine Gasturbine,

FIG 2

ein keramischer Hitzeschildstein einer Tragstruktur gemäß dem Stand der Technik,

FIG 3

in einer Draufsicht auf die Heißseite flächendeckend nebeneinander angeordneter Hitzeschildsteine gemäß der Erfindung,

FIG 4

eine Anzahl flächendeckend nebeneinander angeordneter Hitzeschildsteine mit gegenüber FIG 3 alternativer Geometrie, und

FIG 5

in einer Schnittansicht die Befestigung eines Hitzeschildsteins an der Tragstruktur.

In it show in simplified and not to scale representation:

FIG. 1

a half-section through a gas turbine,

FIG. 2

a ceramic heat shield brick of a support structure according to the prior art,

FIG. 3

in a plan view of the hot side area-covering side by side arranged heat shield stones according to the invention,

FIG. 4

a number of surface next to each other arranged heat shield bricks with respect to FIG 3 alternative geometry, and

FIG. 5

in a sectional view, the attachment of a heat shield brick to the support structure.

Identical parts are given the same reference numerals in all figures Mistake.

The gas turbine 1 according to FIG. 1 has a compressor 2 for Combustion air, a combustion chamber 4, and a turbine 6 for driving the compressor 2 and a non-illustrated Generator and a working machine. These are the turbine 6 and the compressor 2 on a common, also known as turbine rotor turbine shaft arranged with the generator or the working machine is connected, and rotatably mounted about its central axis is. The running in the manner of an annular combustion chamber combustion chamber 4 is with a number of burners for combustion a liquid or gaseous fuel equipped. The Turbine 6 has a number of connected to the turbine shaft 8, rotatable blades 12 on. The blades 12 are arranged in a ring on the turbine shaft 8 and thus form a number of blade rows. Farther The turbine 6 includes a number of stationary vanes 14, which is also coronal under the formation of Vanes rows on an inner housing 16 of the turbines are attached. The blades 12 serve to drive the turbine shaft by momentum transfer from the turbine. 6 flowing through hot medium, the working medium M. Die Guide vanes 14, however, serve to guide the flow of the Working medium M between two each in the flow direction the working medium M, z. As the hot gas, seen successive blade rows or Rotor blade rings. A successive pair of one Wreath of vanes 14 or a row of vanes and from a wreath blades 12 or a row of blades is also referred to as a turbine stage.

Each vane 14 has a so-called blade root Platform 18 on which is to fix the respective Guide vane 14 on the inner housing of the turbine 6 as a wall element is arranged. The platform 18 is a thermal comparatively heavily loaded component, which is the outer boundary a hot gas channel for the turbine 6 flowing through Working medium M forms. Each blade 12 is in analogous manner via a so-called blade root Platform 20 attached to the turbine shaft 8.

Between spaced platforms 18 the vane 14 is two adjacent vane rows in each case a guide ring 21 on the inner housing 16 of the turbine. 6 arranged. The outer surface of each guide ring 21 is while also the hot, the turbine 6 flowing through the working medium M exposed and in the radial direction from the outside End of the blade 12 opposite him by a Gap spaced. The between adjacent vane rows arranged guide rings 21 serve in particular as cover elements, the inner wall 16 or other housings - single board parts - before a thermal Overuse by the turbine 6 flowing through hot working medium M protects. The combustion chamber 4 is of a combustion chamber housing 29 limited, wherein combustion chamber side a combustion chamber wall 24 is formed. In the embodiment is the combustion chamber 4 as a so-called annular combustion chamber designed in which a variety of circumferentially order the turbine shaft 8 around arranged burners 10 in one common combustion chamber space open. This is the combustion chamber 4 configured in its entirety as an annular structure, which is positioned around the turbine shaft 8 around.

To achieve a comparatively high efficiency the combustion chamber 4 for comparatively high hot gas temperatures the working medium M of about 1200 ° C to 1500 ° C designed. Even with these, unfavorable for the materials Operating conditions a comparatively long service life to allow the combustion chamber wall 24 is on its the working medium M facing side with one of heat shield stones 26 provided combustion chamber lining provided. The Heat shield elements 26 are suitable over - in the Figure 1 not shown fastening means - on the Combustion chamber wall 24 attached.

FIG. 2 shows an example for the clamping of a heat shield brick 26 shown in the prior art, wherein Details of the clamping of a stone 26 on one Support structure 31 are shown. The heat shield brick 26 points two opposing flanks 55 between the hot side 35 and cold side 33, which are provided with gripping grooves 57, in each case a gripping tab 59 of a substantially L-shaped Holder 61 engages. The holders 61 are in one Groove 63 of the support structure 31 on mounting tabs 65, the Groove floor 67 rest, anchored. Both fastening straps 65 are arranged so that they under the heat shield stone 26th protrude and accordingly from this against excessive thermal Be protected. Furthermore, a spacer 69 indicated, which for the distancing of holders 61 associated with the various bricks 26, can serve. In the concept of stapling heat shield stones 26 according to the state shown here in Figure 2 In the art, a holder 61 is exactly one heat shield brick 26 associated with it and with its gripping tab 59 in engagement with the gripping groove 57. In this case, a plurality of holders 61, In general, four pieces required to be a single Heat shield block 26 to be attached to the support structure 31. Of the Assembly effort is significant, as to replace a Hitzeschildstein 26 also regularly a whole series of adjacent heat shield bricks 26 from the support structure 31 to are solved. In addition, by the Verklammerungskonzept an inadequate passive backup of the Heat shield stone 26 at a possible break or ensures continuous crack of the heat shield block 26 is. The detachment of fragments from a heat shield stone 26 is with serious dangers for the combustion chamber 4 and the combustion chamber 4 downstream turbine 6 (see Figure 1) connected.

The invention occurs with a combustion chamber 4 with a completely new fastening concept for heat shield stones 26 to overcome the disadvantages described. This is shown in FIG. 3 by way of example with reference to a plan view the hot side 35 adjacent to a number of areas arranged heat shield bricks 26A to 26D shown. The heat shield stones 26A, 26B, 26C, 26D have while in its basic form a quadrangular, approximate square, geometry on. A heat shield brick 26A and a to adjacent heat shield stone 26D are by a common Mounting bolt 37 at the in the figure 3 not Support structure 31 shown in detail (see the discussion in Figure 5 below) attached. It is in one Corner 71 or a corner point a common mounting bolt 37 provided, each of the adjacent heat shield stones 26A, 26B, 26C, 26D. For easier disassembly a heat shield brick 26A, 26B, 26C, 26D is the fastening bolt 37 accessible from the hot side 35 ago and has a receptacle 41 for engagement of an assembly tool. in the assembled state is - as shown here - the bolt head 39th in corresponding recesses 43 of adjacent heat shield stones 26A, 26B, 26C, 26D lowered, the recessed Bolt head 39 planar with the hot side surface 45 of the Heat shield stones 26A to 26D completes. The fastening bolt 37 is made of a metallic material and for cooling purposes if necessary, with coolant holes for admission designed with a coolant.

In an alternative embodiment of the illustrated in Figure 3 nationwide lining of a combustion chamber 4 with heat shield stones FIG. 26 shows FIG. 4 heat shield bricks 26A to 26F, which have a triangular basic shape. Each of the heat shield stones 26A to 26F here has the geometry of a equilateral triangle, which makes it particularly easy Way a full coverage of a combustion chamber wall 24th (See Figure 1) is reached. In this type of combustion chamber lining lie in the corner 71 or the vertex the six heat shield bricks 26A to 26F adjacent to each other and be in the corner 71 by a single joint fixing bolt 37 attached and secured. At a crack or even a complete break through of one of the heat shields 26A to 26F is through the multiple fuse a dissolution of fragments from the composite largely excluded, so compared to conventional Mounting concepts for combustion chamber linings on Heat shield stone base increased life in particular good emergency running properties, is achieved. In addition, it is the assembly and disassembly of a single of the Heat shield stones 26A to 26F very easily possible because of Mounting bolt 37 accessible from the hot side 35 ago and therefore from the combustion chamber ago with a simple assembly tool, which designed for an engagement in the receptacle 41 is, solvable.

For a better illustration of the combustion chamber 4 according to the invention is a detail in Figure 5 in a sectional view a lined with heat shield bricks 26A, 26B combustion chamber wall 24 shown. The heat shield bricks 26A, 26B are arranged adjacent to each other and by a common Fixing bolts 37 attached to the support structure 31. The Attachment is done in such a way that the fixing bolt 37 against a spring force in the axial direction of the fastening bolt 37 is displaceable. For this purpose, the support structure 31, a wall 47 through which an end portion 49 of the fastening bolt 37 extends. At the end section 49 of the fastening bolt 37 engages a spring element 51, which is a compression spring in this case, in the installed state is under a bias. The compression spring 51 surrounds in this case the end portion 49. At the end portion 49 is a holding element 53 is arranged, wherein the holding element 53 a Abutment for the spring element 51 forms. This is one resilient fastening of the heat shield bricks 26A, 26B the support structure 31 ensures, so that in particular thermal Relative strains due to different thermal expansion coefficients compensates for the materials used become. The bolt head 39 closes with the hot side surface 45 of the heat shield bricks 26A, 26B planar from, so that good flow guidance properties for the hot Working medium M, with which the heat shield elements 26 A, 26 B are acted upon in operation of the combustion chamber 4, guaranteed are. The bolt head 39 of the fastening bolt 37 is cone-shaped or frustoconical configured. The flank of a respective heat shield brick 26A, 26B is corresponding the conical surface of the cone-shaped Bolt head 39 with a corresponding recess 43rd Mistake. In the assembled state, the bolt head 39 is in the corresponding recesses of the adjacent Heat shield stones 26A, 26B lowered. For cooling purposes are the heat shield bricks 26A, 26B from the support structure 31 through a gap 73 spaced. This gap 73 can be required by suitable - not shown - distance or Damping elements between the heat shield brick 26A, 26B and the support structure 31 are arranged causes. It but are also other supply channels for a coolant K possible. For cooling purposes, the gap 73 with a Coolant K, for example, cooling air, applied. The Coolant K cools the heat shield bricks 26A, 26B of the cold side 33 ago and also serves to cool the Fixing bolt 37. For efficient heat dissipation is the fastening bolt 37, this advantageously from a metal is made. In a possible Embodiment, the fastening bolt 37 in his End portion 49 a thread, which with a Counter thread of the holding member 53 is engaged, so that via the screw the spring force of the spring element 51 is adjustable. In the embodiments shown of Figures 3 and 4, the fastening bolt 37 in a Corner 71 or a corner point of adjacent heat shield stones 26A, 26B positioned. It is also possible and moving completely within the scope of the fastening concept of the invention, when the fastening bolt 37 adjacent to an edge Heat shield elements 26A, 26B is positioned and on this Assemble the heat shield elements 26A, 26B together on the Support structure 31 securely and permanently attached.

Claims (17)

Combustion chamber (4) for a gas turbine (1), whose combustion chamber wall (24) has on the inside a number of heat shield bricks (26, 26A, 26B, 26C, 26D) which are arranged substantially surface-wide next to one another and fastened to a support structure (31). each heat shield brick (26), 26A, 26B, 26C, 26D) having a cold side (33) facing the support structure (31) and a hot side (35) facing the cold side (33) and being exposed to a hot medium (M),
characterized in that a heat shield brick (26A, 26B) and a heat shield brick (26C, 26D) adjacent thereto are fastened to the support structure (31) by at least one common fastening bolt (37). Combustion chamber (4) according to claim 1,
characterized in that the heat shield bricks (26A, 26B, 26C, 26D) are each configured as a polygon with a common mounting bolt (37) positioned at a corner (71). Combustion chamber (4) according to claim 2,
characterized in that the heat shield bricks (26A, 26B, 26C, 26D) are configured as triangles or squares fixed to the support structure (31) by a common fixing bolt (37) positioned at a corner. Combustion chamber (4) according to one of claims 1 to 3,
characterized in that for dismantling the heat shield bricks (26, 26A, 26B, 26C, 26D) of the fastening bolt (37) of the hot side (35) is accessible and detachable ago. Combustion chamber (4) according to one of claims 1 to 4,
characterized in that the fastening bolt (37) has a in the axial direction of the fastening bolt (37) normal to the hot side in cross-section widening bolt head (39). Combustion chamber (4) according to claim 5,
characterized in that the bolt head (39) is provided with a receptacle (41) for an assembly tool. Combustion chamber (4) according to claim 5 or 6,
characterized in that in the mounted state, the bolt head (39) is lowered into corresponding recesses (43) of adjacent heat shield bricks (26A, 26B). Combustion chamber (4) according to claim 7,
characterized in that the countersunk bolt head (39) is flush with the hot side surface (45) of the heat shield bricks (26A, 26B). Combustion chamber (4) according to one of claims 1 to 8,
characterized in that the fastening bolt (37) has a conically shaped bolt head (39) Combustion chamber (4) according to one of claims 1 to 9,
characterized by a metallic fastening bolt (37). Combustion chamber (4) according to one of claims 1 to 10,
characterized in that the fastening bolt (37) against a spring force in the axial direction of the fastening bolt (37) is displaceable. Combustion chamber (4) according to one of claims 1 to 11,
characterized in that the support structure (31) has at least one wall (47) through which extends at least one end portion (49) of the fastening bolt (37). Combustion chamber (4) according to claim 12,
characterized in that at the end portion (49) of the fastening bolt (37) engages a spring element (51). Combustion chamber (4) according to claim 13,
characterized in that the spring element (51) is a compression spring. Combustion chamber (4) according to claim 14,
characterized in that the compression spring (51) surrounds the end portion (49). Combustion chamber (4) according to one of claims 12 to 15,
characterized in that at the end portion (49) has a holding element (53) is arranged, wherein the holding element (53) forms an abutment for the spring element (51). Gas turbine (1) with a combustion chamber (4) according to one of previous claims.

Images