JPH0640663U - Gas turbine combustor - Google Patents

Abstract

(57) [Summary] [Purpose] Combustion of 6B gas, 5C gas, etc. with a high combustion speed and a wide flammable range is premixed with air in a premixed trachea with an elbow curved outlet. (EN) Provided is a gas turbine combustor capable of preventing the premixed trachea outlet from being burnt even when it is supplied into the internal cylinder. [Composition] A combustor outer cylinder 2, a combustor inner cylinder 3 installed in the combustor outer cylinder 2, a pilot injection valve 4 arranged at the top of the combustor inner cylinder 3, and a combustor inner cylinder 3 In the gas turbine combustor 1 including a plurality of premixed trachea 8 arranged facing the premixed combustion region B and having an outlet curved in an elbow, a slit-like shape is formed at the outlet 8a of the premixed trachea 8. The scavenging port 12 of

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas turbine combustor, and more particularly to a gas turbine combustor designed to prevent burnout of a premixed gas pipe outlet in the gas turbine combustor.

[0002]

[Prior art]

 If the outlet of the premixed trachea is curved in an elbow shape to reduce the size of the gas turbine combustor, vortices are likely to occur at the outlet of the premixed trachea, particularly at the inner diameter side thereof. On the other hand, instead of 13A gas (LNG-based city gas), 6B gas, 5C gas, etc. with a high combustion speed and a wide flammable range are premixed with air in the premixed trachea to burn low NOx In addition, the premixed trachea is prone to flashback. In particular, as described above, when a vortex is generated at the premixed trachea outlet to have a flame holding function, the premixed trachea outlet is burned and low NOx combustion becomes impossible.

[0003]

[Problems to be solved by the device]

 The present invention has been made in order to overcome such a conventional problem, and an object thereof is to make a fuel gas such as 6B gas or 5C gas having a high combustion speed and a wide combustible range into an elbow-shaped outlet. An object of the present invention is to provide a gas turbine combustor capable of preventing burnout at the outlet of the premixed trachea even when premixed with air in a curved premixed trachea and supplied to the combustor inner cylinder.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a gas turbine combustor of the present invention comprises a combustor outer cylinder, a combustor inner cylinder installed in the combustor outer cylinder, and a pilot disposed on the top of the combustor inner cylinder. In the gas turbine combustor, which comprises an injection valve and a plurality of premixed gas pipes which are arranged so as to face the premixed combustion region B in the combustor inner cylinder and have an outlet portion curved in an elbow shape, It is characterized in that a slit-shaped scavenging port is provided at the exit of the mixing air pipe.

By providing the slit-shaped scavenging port at the outlet of the premixed trachea in this way, fuel gas having a high combustion rate such as 6B gas and 5C gas and having a wide combustible range and the elbow at the outlet are provided. Even when the air is premixed with the curved premixed trachea and supplied into the combustor inner cylinder, the premixed trachea outlet can be prevented from being burnt out.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a gas turbine combustor, and the gas turbine combustor 1 mainly includes a combustor outer cylinder 2, a combustor inner cylinder 3, a pilot injection valve 4, and a plurality of premixers 5. It consists of and.

The inner combustor cylinder 3 is composed of a small diameter portion 3a forming a diffusion combustion region A, a truncated cone portion 3b forming a premixed combustion region B, and a large diameter portion 3c forming a main combustion region C. The pilot injection valve 4 and the swirler 6 are disposed on the top of the engine. On the other hand, the premixer 5 is composed of the fuel injection nozzle 7 and the premixer tube 8. However, in order to downsize the combustor outer cylinder 2, in other words, the gas turbine combustor 1, the premixer tube 8 is used. The outlet portion 8a is curved in an elbow shape. As shown in FIG. 3, the premixed trachea outlet 8a fitted into the hole 9 formed in the truncated cone portion 3b of the combustion inner cylinder 3 is formed between the premixed trachea outlet 8a and the hole 9. It is held by a plurality of spacers 11 mounted in the annular gap 10.

Further, as shown in FIGS. 2 and 3, a large number of slit-shaped scavenging holes 12 are arranged on the inner diameter side of the outlet portion 8 a of the premixing air pipe 8. Next, the operation of the present invention will be described. The compressed air a compressed by a turbo compressor (not shown) rises between the combustor outer cylinder 2 and the combustor inner cylinder 3, and then flows into the combustor inner cylinder 3 through the swirler 6.

On the other hand, the fuel F injected from the pilot injection valve 4 diffuses in the small diameter portion 3 a of the combustor inner cylinder 3 while mixing with the compressed air a flowing through the swirler 6 into the combustor inner cylinder 3. To burn. Further, the fuel gas G injected from the fuel injection nozzle 7 into the premixed air tube 8 flows into the truncated cone part 3b of the combustor inner cylinder 3 while mixing with the compressed air a flowing into the premixed air tube 8. , Premix combustion.

Further, a part of the compressed air a is provided in the gap 10 between the premixed trachea outlet 8a and the hole 9 formed in the combustor inner cylinder truncated cone part 3b and on the inner diameter side of the premixed trachea outlet 8a. The gas flows into the combustor inner cylinder 3 through a large number of slit-shaped scavenging ports 12. These scavengings cool the premixed trachea outlet 8a, particularly the inner diameter side of the premixed trachea outlet 8a, and prevent vortices from being generated on the side of the premixed trachea outlet 8a.

In the above description, the case where the premixed gas pipe 8 and the hole 9 of the combustor inner cylinder 3 are arranged concentrically has been described. However, as shown in FIG. It may be eccentrically arranged on the outer diameter side of the hole 9 of the cylinder 3. Further, as shown in FIG. 5, most of the gap 10 may be filled with a spacer 11 while leaving a portion having a slit-shaped scavenging port 12.

[0012]

[Effect of device]

 As described above, according to the present invention, since the slit-shaped scavenging port is provided at the outlet of the premixed trachea, the combustion gas such as 6B gas or 5C gas is fast and the fuel gas having a wide combustible range is provided at the outlet. Even when air is premixed in the elbow-shaped premixed trachea and supplied into the combustor inner cylinder, it is possible to prevent burnout at the premixed trachea outlet.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a gas turbine combustor according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of a gas turbine combustor according to the present invention.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory view showing another engagement state between the premixed trachea and the hole.

FIG. 5 is an explanatory view showing still another engagement state between the premixed trachea and the hole.

[Explanation of symbols]

 1 Gas Turbine Combustor 2 Combustor Outer Cylinder 3 Combustor Inner Cylinder 4 Pilot Injection Valve 8 Premix Trachea 8a Premix Trache Outlet 12 Slit-like Scavenger B B Premix Combustion Region

Front page continuation (72) Inventor Kiyoshi Hashimoto 5373 North Kitajojo East, Chuo-ku, Sapporo, Hokkaido Inside Hokkaido Gas Co., Ltd. (72) Yuichi Nakamura 5373 North Kitajojo East, Chuo-ku, Sapporo, Hokkaido Hokkaido Inside Gas Co., Ltd. (72) Inventor Seiji Nagata 5-373 Kita-Shijo East, Chuo-ku, Sapporo-shi, Hokkaido Inside Hokkaido Gas Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A combustor outer cylinder, a combustor inner cylinder installed in the combustor outer cylinder, a pilot injection valve arranged at the top of the combustor inner cylinder, and a precombustor in the combustor inner cylinder. In a gas turbine combustor including a plurality of premixed trachea arranged facing the mixed combustion region B and having an outlet curved in an elbow, a slit-shaped scavenging port is provided at the outlet of the premixed trachea. A gas turbine combustor characterized by being provided.