JPH05118549A - Burner for gas turbine - Google Patents

Abstract

PURPOSE:To sufficiently absorb the thermal deformation of a burner for a gas turbine by resiliently supporting a liner and connectively supporting the liner in an angularly displaceable manner with respect to an outer cylinder. CONSTITUTION:The base end face 3b of a liner 3 is in contact with the flange part 2a of a premixer 2, and springs 11 are compressingly interposed between the base end face 2b of the premixer 2 and the forward end face 7c of a male member 7. The premixer 2 and the liner 3 are pressed against a support member 10 and held in this state by the pressing force of the springs 11. As a means for connectively supporting the support member 10 in an angularly displaceable manner to an outer cylinder 4, a ball pipe joint 5 consisting of the male member 7, a female member 6 and springs 8 is provided. A flange member 7d on the base end side of the male member 7 has a spherical sliding surface 7a, while a flange part 6b on the forward end side of the female member 6 has a spherical sliding surface 6a, and both of them are slidably connected to each other. Thus, the thermal deformation of the liner, which may be caused in its axial and bending directions with respect to the outer cylinder, can be absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a gas turbine combustor.

[0002]

2. Description of the Related Art A conventional gas turbine combustor is shown in FIG. 6, for example.

Explaining this, the liner 3 is arranged in the outer cylinder 4, the fuel injection valve 1 faces the base end side of the liner 3, and the premixer 2 for guiding intake air is coaxially arranged. .. In the liner 3, the fuel injected from the fuel injection valve 1 and the intake air introduced from the premixer 2 are mixed to form a diffusion flame.

The fuel injection valve 1 is fastened to the outer cylinder 4 by bolts 19, and the liner 3 is supported by the outer cylinder 4 via the fuel injection valve 1 and the premixer 2. The tip end (not shown) of the liner 3 is slidably inserted into the tail tube of the combustor,
The liner 3 is somewhat absorbed by the sliding displacement of the insertion portion of the liner 3 into the tail tube of the combustor.

[0005]

However, in such a conventional device, since the base end portion of the liner 3 is fixedly connected to the outer cylinder 4, heat in the bending direction of the liner 3 and the like is generated. There is a possibility that the deformation cannot be absorbed, and the thermal stress may be concentrated on the joint between the premixer 2 and the liner 3 with respect to the outer cylinder 4, and there is room for improvement in this respect.

Further, if the axial thermal deformation of the liner 3, the outer cylinder 4, etc. becomes large, there is a possibility that the sliding displacement of the insertion portion of the liner 3 into the transition piece of the combustor cannot be sufficiently absorbed. However, there was room for improvement (JP-A-57-12).
7723, gazette).

The present invention focuses on the above problems and aims to sufficiently absorb thermal deformation in a combustor of a gas turbine.

[0008]

SUMMARY OF THE INVENTION The present invention is a gas turbine combustor having a tubular liner defining a combustion chamber and an outer cylinder to which the liner is attached. The supporting means elastically supports the liner. And free connecting means for connecting and supporting the supporting means so as to be angularly displaceable with respect to the outer cylinder.

Further, the supporting means includes a supporting member for restricting the displacement of the liner to the downstream side in the combustion gas ejection direction, and an elastic body for pressing the liner against the supporting member, and the free connecting means has a spherical shape. A ball pipe joint having a sliding surface for connecting and supporting the supporting means to the outer cylinder so as to be angularly displaceable is provided.

As the supporting means, a plurality of cantilever beams are provided around the liner, and the free ends of the cantilever beams are brought into contact with the liner, and at least one of the cantilever beam and the liner with respect to the axial direction of the liner. The inclined surface is formed so as to urge the liner to the upstream side in the direction of jetting the combustion gas by the elastic restoring force of the cantilever.

Further, as the free connecting means, there is provided a bellows pipe joint having a corrugated cross section and connecting and supporting the supporting means so as to be angularly displaceable with respect to the outer cylinder.

[0012]

The axial thermal deformation of the liner with respect to the outer cylinder is absorbed by the support means elastically supporting the liner with respect to the outer cylinder. The thermal deformation in the bending direction of the liner with respect to the outer cylinder is absorbed by the angular displacement of the free connection means. As a result, it is possible to prevent permanent deformation of the metal parts constituting the combustor and damage of the ceramic parts.

Further, as the support means, a support member for restricting the displacement of the liner to the downstream side in the combustion gas ejection direction and an elastic body for pressing the liner against the support member are provided, so that the liner can be axially moved with respect to the outer cylinder. The thermal deformation is absorbed by the expansion and contraction of the elastic body. As the free connecting means, a ball pipe joint having a spherical sliding surface for connecting and supporting the supporting means to the outer cylinder so as to be angularly displaceable is provided, whereby thermal deformation in the bending direction of the liner with respect to the outer cylinder is prevented. , It is absorbed by sliding while making spherical contact with the ball pipe joint.

Further, by providing a plurality of cantilevers for supporting the liner as the supporting means, the axial thermal deformation of the liner is absorbed by the elastic restoring force of the cantilever in the bending direction.

Further, since the bellows pipe joint having a corrugated cross section is provided as the free connection means, thermal deformation in the bending direction of the liner with respect to the outer cylinder is absorbed by elastically bending the bellows pipe.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the fuel injection valve 1 is fastened to an outer cylinder 4 by a bolt (not shown) via a flange 15, and the liner 3 and the premixer 2 are connected to the outer cylinder 4 by a ball pipe joint 5, It is supported via the intermediate member 9, the support member 10, and the spring 11 as an elastic body. A tip portion (not shown) of the liner 3 is slidably inserted into a transition piece of the combustor.

As shown in FIG. 2, four rod-shaped support members 10 are arranged at equal intervals around the cylindrical liner 3.
A joint surface 10a that is orthogonal to the axial direction of the liner 3 is formed at the tip of each support member 10, while a protrusion 3a that abuts the joint surface 10a is formed on the liner 3, whereby combustion of the liner 3 is performed. Displacement to the downstream side (rightward in the figure) in the gas ejection direction is restricted.

The base end surface 3b of the liner 3 abuts on the flange portion 2a of the premixer 2, and a spring 11 is interposed between the base end surface 2b of the premixer 2 and the tip surface 7c of the male member 7 by being compressed. ,
The premixer 2 and the liner 3 are pressed against and held by the support member 10 by the biasing force of the spring 11. By these, the support means for elastically supporting the liner 1 is configured.

The intermediate member 9 connecting the liner 3 and the male member 7 is
It is formed by being divided into two parts in an annular shape having a U-shaped cross section, and a retaining ring 12 is fitted on the outer periphery thereof. The collar portion 9a formed on the tip side of the intermediate member 9 has a claw portion 10b of each support member 10.
Are joined.

The male member 7 is formed in an annular shape having a U-shaped cross section, and a flange portion 7b formed on the tip side thereof is joined to a flange portion 9b formed on the base end side of the intermediate member 9. .. A plurality of female members 6 are radially arranged around the male member 7, each female member 6 has an L-shaped cross section, and the flange portion 6c on the proximal end side is fastened to the outer cylinder 4 by a bolt (not shown).

A spring 8 is compressed and interposed between the male member 7 and the outer cylinder 4, and the male member 7 is pressed against the female member 6.

The ball pipe joint 5 is used as a free connecting means for connecting and supporting the support member 10 to the outer cylinder 4 so as to be angularly displaceable.
Is composed of the male member 7, the female member 6 and the spring 8. The flange portion 7d formed on the base end side of the male member 7 has a spherical sliding surface 7a, and the distal end side flange portion 6b of the female member 6 also has a spherical sliding surface 6a, both of which are slidable. It is designed to be joined. The female member 6 and the male member 7
Only one of the sliding surfaces 6a and 7a may be curved to be spherical.

It is also possible to provide an air distribution ratio varying mechanism for varying the opening area of the opening 3d of the liner 3.

Next, the operation will be described.

Since the combustor of the gas turbine is used in a high-temperature or ultra-high temperature atmosphere, the parts such as the outer cylinder 4, the liner 3 and the combustor transition piece of the combustor are oriented in the axial direction or the bending direction of the liner 3. Thermal deformation occurs.

The liner 3 and the premixer 2 for the outer cylinder 4
The axial thermal deformation of is absorbed by the expansion and contraction of the spring 11.

The liner 3 and the premixer 2 for the outer cylinder 4
The thermal deformation in the bending direction is absorbed by the male member 7 sliding on the female member 6 while making spherical contact.

As a result, it is possible to prevent the metallic parts constituting the combustor from being permanently deformed and the ceramic parts from being damaged.

Next, another embodiment shown in FIGS. 3 and 4 will be described.

A rod-shaped cantilever 20 for supporting the liner 3
Is integrally formed with the crown portion 21 joined to the male member 7. The crown portion 21 is formed by being divided into two, and the retaining ring 12 is fitted on the outer periphery thereof. Collar portion 21 formed on the base end side of the crown portion 21
b is joined to a flange portion 7b formed on the tip side of the male member 7.

The free end of the cantilever 20 is formed with a sliding surface 20a inclined with respect to the axial direction of the liner 3, while the liner 3 is formed with a projection 3a for abutting the sliding surface 20a. Due to the elastic restoring force of each cantilever 20, the liner 3 is urged to the upstream side (the left direction in the drawing) in the combustion gas ejection direction. By these, the support means for elastically supporting the liner 1 is configured.

Next, the operation will be described.

In the state where the sliding surface 20a of the cantilever 20 is joined to the projection 3a of the liner 3, the rod-shaped cantilever 20 is elastically deformed in the bending direction, and the sliding surface 20a of the cantilever 20 is the axis of the liner 3. Since it is inclined with respect to the direction, cantilever 20
The liner 3 is pressed against the male member 7 via the premixer 2 by the elastic restoring force of the.

The liner 3 and the premixer 2 with respect to the outer cylinder 4
The axial thermal deformation that occurs is that the portion where the projection 3a of the liner 3 contacts the sliding surface 20a of the cantilever 20 moves to the right in the figure, and each rod-shaped cantilever 20 elastically deforms in the bending direction. Absorbed by

The thermal deformation of the outer cylinder 4 in the liner 3 and the premixer 2 in the bending direction is caused by the fact that the male member 7 makes spherical contact with the female member 6 and rotates as in the above-described embodiment. Absorbed by.

The liner 3 is formed with a sliding surface inclined with respect to the axial direction of the liner 3, and each cantilever 2 is formed on this sliding surface.
The liner 3 may be biased to the upstream side in the direction of jetting the combustion gas by pressing the free end of 0.

Next, another embodiment shown in FIG. 5 will be described.

The liner 3 and the premixer 2 are supported by the outer cylinder 4 via a bellows pipe joint 30, an intermediate member 32, an intermediate member 9, a support member 10, and a spring 11.

The bellows pipe joint 3 is used as a free connecting means for connecting and supporting the support member 10 to the outer cylinder 4 so as to be angularly displaceable.
The bellows 31 of 0 is formed in a tubular shape whose cross section is bent in a wave shape. The base end of the bellows 31 is fastened to the outer cylinder 4 via an annular spring seat 33, and the tip end of the bellows 31 is fastened to the proximal end flange portion 32a of the intermediate member 32 via an annular spring seat 34.

Next, the operation will be described.

The liner 3 and the premixer 2 with respect to the outer cylinder 4
When thermal deformation occurs in the axial direction, it is absorbed by the expansion and contraction of the spring 11.

The liner 3 and the premixer 2 with respect to the outer cylinder 4
The thermal deformation in the bending direction that occurs at 1 is absorbed by the bellows 31 bending due to elastic deformation.

The axial thermal deformation of the outer cylinder 4 in the liner 3 and the premixer 2 is absorbed by the expansion and contraction of the spring 11.

[0045]

According to the first aspect of the present invention, the liner for the outer cylinder is provided, since the support means for elastically supporting the liner and the free connecting means for connecting and supporting the support means so as to be angularly displaceable with respect to the outer cylinder are provided. It is possible to absorb the thermal deformation in the axial direction and the bending direction and prevent permanent deformation of the metal parts constituting the combustor and damage of the ceramic parts.

In the second aspect of the invention, the elastic deformation of the liner absorbs the axial thermal deformation of the liner with respect to the outer cylinder, and the ball pipe joint slides while making spherical contact to cause heat in the bending direction of the liner with respect to the outer cylinder. Absorb the deformation.

In the third invention, the elastic restoring force in the bending direction of the cantilever absorbs the thermal deformation of the liner with respect to the outer cylinder in the axial direction, so that the number of parts can be reduced, the assemblability is improved, and the manufacturing cost is improved. Can be reduced.

In the fourth aspect of the invention, the bellows tube is elastically bent to absorb the thermal deformation of the liner with respect to the outer cylinder in the bending direction. In this case as well, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4 is an exploded perspective view of the same.

FIG. 5 is a sectional view showing still another embodiment.

FIG. 6 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 2 premixer 3 liner 3a protrusion 4 outer cylinder 5 ball pipe joint (free connecting means) 6a sliding surface 7a sliding surface 8 spring 10 supporting member 11 spring 20 supporting member 20a sliding surface 30 bellows pipe joint (free connecting means) 31 bellows

Claims (4)

[Claims] 1. A gas turbine combustor comprising a tubular liner defining a combustion chamber and an outer cylinder to which the liner is attached, and a support means for elastically supporting the liner and the support means for the outer cylinder. And a free coupling means for coupling and supporting the same so as to be angularly displaceable with respect to the combustor of the gas turbine. 2. The support means is composed of a support member that restricts the displacement of the liner to the downstream side in the combustion gas ejection direction, and an elastic body that presses the liner against the support member, and the free coupling means has a spherical sliding surface. The combustor for a gas turbine according to claim 1, further comprising a ball pipe joint that has a surface and that supports and supports the supporting means so as to be angularly displaced with respect to the outer cylinder. 3. The support means includes a plurality of cantilevers around a liner, the free end of the cantilever is brought into contact with the liner, and at least one of the cantilever and the liner with respect to the axial direction of the liner. 2. The combustor for a gas turbine according to claim 1, wherein the liner is inclined to form an inclined sliding surface to urge the liner to the upstream side in the combustion gas ejection direction by the elastic restoring force of the cantilever. 4. The gas turbine according to claim 1, wherein the free connecting means includes a bellows pipe joint having a corrugated cross section and connecting and supporting the supporting means so as to be angularly displaceable with respect to the outer cylinder. Combustor.