JPH1162549A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb combustion vibration energy with sound absorbing material so as to prevent vibration accompanying combustion from generating by surrounding the upper stream side of fuel nozzles with a pipe, and filling the space between the pipe and the fuel nozzles with sound absorbing material. SOLUTION: An extended pipe 13 is extended on the upper stream side of fuel nozzles 3 so as to surround the circumference of them. A sound absorbing material holder with perforated plates 15 is provided between the extended pipe 13 and the fuel nozzles 3, and the interior of the sound absorbing material holder is filled with sound absorbing material 14. The perforated plates 15 are provided for preventing the sound absorbing material 14 from splashing, the sound absorbing material holder is divided into several layers for freely setting deviation of the sound absorbing material 14 and the thickness of the sound absorbing material 14 so as to enable damping effect to be adjusted. Because a space to be filled with the sound absorbing material 14 is provided on the upper stream parts of the fuel nozzles 3, the flow of air for combustion is not obstructed. The sound absorbing material 14 with the perforated plate 15 is also fitted on the inside of a cabin 2. Hereby, combustion vibration energy is effectively absorbed by the sound absorbing material to prevent vibration accompanying combustion from generating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustor for burning fuel in a gas turbine, a boiler, or the like.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing the vicinity of a combustor in a gas turbine provided with a conventional combustor. The conventional combustor will be described with reference to FIG. In FIG. 6, reference numeral 1 denotes a combustor, which is attached to a cabin 2 of a gas turbine.

[0003] The combustor 1 has a fuel nozzle 3, an inner cylinder 4, and a transition piece 5. 6 is an outer cylinder. A bypass elbow 7 is attached to the transition piece 5. Reference numeral 8 denotes a bypass valve, and reference numeral 9 denotes a bypass valve variable mechanism.

[0004] The reference numeral 10 denotes an air compressor, in which the compressed compressor discharge air 11 flows into the cabin 2 and passes around the combustor 1 from the upstream side of the fuel nozzle 3 as shown by an arrow. It is introduced into the combustion air.

[0005] The combustor 1 shown in FIG. 6 has the above-described configuration. In the combustor 1, fuel supplied through the fuel nozzle 3 is burned, and the combustion gas is sent to the gas turbine 12. Drive this.

[0006] Combustion vibration may occur in the combustor 1 as described above, but when combustion vibration occurs in the combustor in a prime mover such as a gas turbine, the combustion vibration energy is stored in the inner cylinder, transition piece, Reflection inside the outer cylinder results in large vibration energy, which may cause fatigue damage of the combustor body and further damage to peripheral components such as turbine blades.

When a large pressure fluctuation occurs in the combustor such as the inner cylinder 4 and the transition piece 5 in the combustor shown in FIG. 6, conventionally, the fuel distribution ratio, the air distribution in the combustor, and the load drop This has been dealt with by changing operating parameters such as the above, and by further modifying the structure of the combustor itself.

[0008]

As described above, in the conventional combustor, when a large pressure fluctuation occurs, it is necessary to change the operating parameters or remodel the structure of the combustor itself. Changing the operating range and modifying the structure is difficult.

Therefore, the present invention does not require any change in the operating parameters, the change in the structure is also the minimum required, and is capable of suppressing the occurrence of the vibration accompanying the combustion without the need for a significant modification. It is an object to provide a combustor.

[0010]

According to the present invention, in order to solve the above-mentioned problems in a combustor having a fuel nozzle, an upstream side of the fuel nozzle is surrounded by a pipe, and a sound absorbing material is provided in a space between the pipe and the fuel nozzle. The present invention provides a combustor filled with:

[0011] In order to solve the above problems, the present invention also provides:
A structure in which a sound absorbing material is disposed on the inner surface of a structure surrounding the combustor and forming a combustion air flow path is employed.

In the combustor of the present invention, the combustion vibration energy is attenuated by a simple means of disposing a sound absorbing material around the fuel nozzle and on the inner surface of the combustion air flow path surrounding the combustor.
The stable combustion region is expanded.

The sound absorbing material used in the combustor according to the present invention is preferably at least one sound absorbing material held by a perforated plate, so that the sound absorbing material can be prevented from being scattered by the perforated plate.

For example, a sound-absorbing material holder with a perforated plate is manufactured, and the holder is filled with the sound-absorbing material. , Scattering can be prevented.

As described above, according to the present invention, it is possible to minimize the change in the structure of the conventional combustor, and it is not necessary to change the operating parameters, and the operating range can be expanded. it can.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a combustor according to the present invention will be described in detail with reference to the embodiments shown in FIGS. In the following embodiments, the same components as those of the conventional apparatus shown in FIG. 5 are denoted by the same reference numerals for simplification of description.

In FIG. 1, reference numeral 13 denotes an extension tube which extends to the upstream side of the fuel nozzle 3 and surrounds it. Between the extension pipe 13 and the fuel nozzle 3, a sound absorbing material holder 16 with a perforated plate 15 (FIG. 3) is provided in five layers.
The sound absorbing material 14 is filled in the sound absorbing material holder 16.

The perforated plate 15 is provided to prevent the sound absorbing material 14 from scattering. The sound absorbing material holder 16 is divided into several layers because of the bias of the sound absorbing material 14 and the thickness of the sound absorbing material 14. This is because the damping effect can be adjusted by being freely set. Since the space for filling the sound absorbing material 14 is provided in the upstream part of the fuel nozzle 3, there is no fear that the flow of the combustion air is obstructed.

A sound absorbing member 14 with a perforated plate 15 is also attached to the inside of the passenger compartment 2 by bolts 17, nuts 18, and washers 19 (FIG. 4).

As described above, by installing the sound absorbing material 14 on the upstream side of the fuel nozzle 3 and in the vehicle interior 2, even if the combustion device does not fill the sound absorbing material 14, the combustion vibration oscillates. Since the attenuation of the combustion field is increased by the sound absorbing material 14, the combustion vibration energy is absorbed and attenuated.

As described above, in the combustor shown in FIG. 1, combustion vibration can be reduced and the operating range can be expanded.
Of course sound absorbing material 14 (glass wool, rock wool, etc.)
The type and thickness can be easily changed.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and specific structures within the scope of the present invention shown in the claims are set forth. Needless to say, various changes may be made to the configuration.

For example, in the above-described embodiment, the sound absorbing material 14 is attached to the ceiling of the passenger compartment 2. However, as long as there is space in the passenger compartment 2, the mounting position of the sound absorbing material is not limited to this. You may choose.

[0024]

As described above, according to the present invention, a pipe surrounding the upstream side of the fuel nozzle is provided, and the space between the pipe and the fuel nozzle is filled with a sound absorbing material, or the space surrounding the combustor is surrounded by combustion. Provided is a combustor in which a sound absorbing material is provided on the inner surface of a structure forming an air flow path. According to this, the combustion vibration energy is effectively absorbed by the sound absorbing material and reduced as shown in FIG. Can be done.

Further, according to the present invention, the use of a sound absorbing material composed of at least one sound absorbing material held by a perforated plate prevents scattering of the sound absorbing material and facilitates assembly thereof.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the vicinity of a combustor in a gas turbine including a combustor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is an explanatory diagram showing a configuration of a sound absorbing material used in the combustor of FIG. 1;

FIG. 4 is an enlarged cross-sectional view showing a part of the cabin of FIG. 1;

FIG. 5 is an explanatory view showing a combustion vibration damping state according to the present invention.

FIG. 6 is a cross-sectional view of the vicinity of a combustor in a gas turbine including a conventional combustor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustor 2 Cabin 3 Fuel nozzle 4 Inner cylinder 5 Tail cylinder 6 Outer cylinder 7 Bypass elbow 8 Bypass valve 9 Variable bypass valve mechanism 10 Air compressor 11 Compressor discharge air 12 Gas turbine

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masaki Ono 2-1-1 Shinhama, Arai-machi, Takasago-shi, Hyogo Prefecture Inside the Mitsubishi Heavy Industries, Ltd. Takasago Machinery Works

Claims (3)

[Claims] 1. A combustor provided with a fuel nozzle, wherein a pipe surrounding an upstream side of the fuel nozzle is provided, and a space between the pipe and the fuel nozzle is filled with a sound absorbing material. . 2. A combustor having a fuel nozzle, wherein a sound absorbing material is disposed on an inner surface of a structure surrounding a periphery of the combustor and forming a combustion air flow path. . 3. The combustor according to claim 1, wherein the sound absorbing material comprises at least one sound absorbing material held by a perforated plate.