JPH06213442A - Burning flame monitor for gas turbine burner - Google Patents

Abstract

PURPOSE:To effectively monitor burning flame in a gas turbine burner, a component in the burner. CONSTITUTION:A riser tube 24 protruding along an axial center of a burner casing 2 protrudes from a transition piece of a burner, a monitoring window 23 is provided at an end of the tube, and a monitoring window 21 opposed to the window 23 is provided. An image detector 22 for observing a burner liner 12 via the windows and a fiber scope 1 for guiding information obtained from the detector out of the casing are contained, and a cooling probe 5 having water-cooling function is provided to effectively monitor overall burning flame in the liner 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion flame monitoring device for a gas turbine combustor.

[0002]

2. Description of the Related Art A conventional combustion flame monitoring device for a gas turbine combustor is, for example, (1) JP-A-3-2676.
Apparatus disclosed in Japanese Patent Laid-Open No. 17- (2)
The device disclosed in the official gazette and (3) the device disclosed in Japanese Patent Laid-Open No. 2-40414 are known.

FIG. 3 is a cutaway front view of the device disclosed in the above (1) publication, and FIG. In these figures, one end of a fiberscope 1 forming a main part of a combustion flame monitoring device is extracted outside a casing 2, and the other end is inserted and installed in a cooling probe 5 fixed to a boss 4 of a transition piece 3. Has been done. The image detection unit 6 provided at the tip of the fiberscope 1 is directed upstream of the transition piece 3, and the front surface of the image detection unit 6 is protected by a window plate 7 made of probe quartz glass. This device monitors the combustion flame in the combustor by looking at the upstream side from the transition piece, and the cooling medium of the fiberscope 1 is an air obtained by further compressing and cooling a part of the discharged gas turbine compressor discharge air. Are supplied from outside the casing 2.

FIG. 5, in which the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, is a cut-away front view of the apparatus disclosed in the above-mentioned publication (2). In this figure, a flame detector 11 is provided so as to penetrate through a casing 2, and the inner end thereof has a combustor liner 1
It is in contact with 2. In the figure, 13 is a fuel supply pipe, 14 is a fuel nozzle, 15 is combustion air supplied from a supply port (not shown), and 16 is a combustion flame. This device monitors a flame in the radial direction of the combustor liner 12 by a flame detector 11 inserted from the outside of the casing 2.

FIG. 6 in which the same parts as those in FIGS. 3 to 5 are denoted by the same reference numerals is a schematic cross-sectional view of the device disclosed in the above publication (3). In this figure, a fiberscope 2 is provided facing each of the plurality of fuel nozzles 17,
A probe (not shown in the figure) protected by a protective cylinder 18 is provided at the tip of each of them. The fiberscopes 2 face the television camera 19 at the ends outside the casing. This device is for a boiler and not for monitoring the combustion flame of a gas turbine combustor, but it is designed so that the combustion state of each fuel nozzle can be monitored.

[0006]

In the apparatus disclosed in the above publication (1), since the air discharged from the gas turbine compressor which has been extracted is further compressed and cooled is used as the cooling medium. And the cost of equipment such as heat exchangers is high. In addition, a control system that controls the cooling air in the entire gas turbine operating range is also required.

The apparatus described in the above-mentioned publication (2) is a local flame monitoring in which the flame can be monitored only from the air supply opening of the combustor liner, and the entire flame inside the combustor, particularly the inner surface of the fuel nozzle, can be monitored. It is not possible to monitor the condition.

The apparatus described in the publication of (3) above is intended for flame monitoring in a boiler as described above. In the gas turbine combustor, all the conditions such as pressure, temperature, flow velocity, space, etc. are more severe than those of the boiler, and moreover there is a rotating body downstream of the combustor. Even when applied to vessels, it is unreliable and unrealistic.

The present invention has been made based on the above-mentioned circumstances, and has a simple structure and is capable of monitoring the entire view of the combustion flame in the gas turbine combustor and the inner surface of the combustor liner as an image. A flame monitoring device is provided.

[0010]

A combustion flame monitoring device for a gas turbine combustor according to the present invention has a fiberscope and an image detecting section which have an axis perpendicular to the axis of the gas turbine combustor casing and which is housed in the image detecting section. First facing
A cooling probe having a water monitoring function and having a water cooling function is provided on a second monitoring window provided on the transition piece of the gas turbine combustor so as to monitor upstream in the axial direction of the combustor liner substantially along its axis. The first monitoring window is opposed to and attached to the combustor casing.

[0011]

In the combustion flame monitoring device of the gas turbine combustor of the present invention having the above-described structure, the fiberscope housed in the cooling probe for protection from high temperature and high pressure is used,
Through the monitoring window provided on the transition piece, you can monitor the whole picture of the combustion flame in the combustor liner and the condition of the parts in the combustor liner as an image. It is possible to strengthen the monitoring of the above and speed up and ensure the discovery of flame status defects such as flashback, abnormal combustion, and blowout.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 in which the same parts as those in FIGS. 3 to 5 are designated by the same reference numerals is a cut-away front view of an embodiment of the present invention. In this figure, a cylindrical cooling probe 5 having an axis perpendicular to the casing axis is attached to a casing 2, and the fiberscope 1 is accommodated in the cooling probe 5. The bottom end of the cooling probe 5 is located below the center line of the casing 2 of the combustor, and a side wall near the bottom end is provided with a first monitoring window 21 facing the fuel nozzle 14 with the center line as the center. Has been. This first monitoring window 2
1, a window plate made of quartz glass is attached. In addition, the first monitoring window 21 of the fiberscope 1
An image detection unit 22 is provided at a position opposite to.

A second monitoring window 23 is provided on the transition piece 3 so as to face the first monitoring window 21. A window plate made of quartz glass is also attached to the second monitoring window 23. In the figure, 24 is a rising pipe provided on the transition piece 3 for installing the second monitoring window 23, and 24a and 24b are flanges and retaining rings for attaching the window plate.

Further, cooling water pipes 25, 25 are connected to the end portion of the cooling probe 5 outside the casing 2, and cooling water 26 is circulated in the cooling probe 5. Also,
A television camera 27 is connected to an end of the fiberscope 1 outside the casing 2, and the television camera 27 is connected to an image output device 28.

In the apparatus of the present embodiment having the above-mentioned structure, the image detecting section 22 has a visual field range 29 having an apex angle θ whose center is the apex and which is regulated by the opening in the transition piece 3 of the rising pipe 24. Therefore, the image detection unit 22
Through the monitoring windows 21 and 23, most of the inner surface of the combustor liner 12 on the upstream side of the transition piece 3 and the injection port of the fuel nozzle 14 can be brought into the field of view. Therefore, the image detection unit 22, the fiberscope 1,
By monitoring the image displayed on the image output device 28 via the television camera 27, the state of each component in the combustor during the operation of the gas turbine can be reliably monitored.

The fiberscope 1 and the image detecting section 22 are housed in a cooling probe 5 which penetrates the casing 2 and is fixed to the casing 2, and cooling water 26 is circulated in the cooling probe 5. The fiberscope 1 and the image detection unit 22 are not thermally affected by the combustion air 15. In addition, the cooling water 26 is the pipe 2
It is supplied to the cooling probe 5 from either 5 or 25,
After the cooling action is performed inside the probe 5, it is discharged from the other side of the pipes 25, 25 to the outside of the probe 5.

Further, the combustion air 15 and the fuel nozzle 1
The fuel injected and supplied into the fuel combustor liner 12 from 4 forms the combustion flame 16 in the combustor liner 12. The relationship between the riser pipe 24 and the image detection unit 22 is set so that the combustion flame 16 is completely within the visual field range 29 of the image detection unit 22, so that the combustion flame in the combustion chamber during gas turbine operation. Sixteen can be monitored.
In addition, the combustion flame 16 generated in the combustor liner 12
Becomes a flow of the combustion gas 30 and flows into the turbine moving blade 32 via the turbine stationary blade 31.

Further, in the above-mentioned embodiment, the window plate made of quartz glass of the first monitoring window 21 is for preventing the leakage of the cooling water in the cooling probe 5, and is transparent so that it can be seen through. The window plate made of quartz glass attached to the second monitoring window 23 prevents the inflow of air into the combustion chamber and is transparent so that it can be seen through.

2 in which the same parts as those in FIG. 1 are designated by the same reference numerals.
[FIG. 6] is a cutaway front view of a modified example of the above-mentioned embodiment, in which the second monitoring window 23 lacks a window plate made of quartz glass. In the above modification, the second monitoring window 23 operates as a dilution air port for introducing a part of the combustion air into the transition piece 3.

[0020]

As described above, in the combustion flame monitoring device of the gas turbine combustor of the present invention, the fiberscope housed in the cooling probe for protection from high temperature and high pressure is used, and combustion is performed through the monitoring window provided in the transition piece. It is possible to monitor the whole picture of the combustion flame inside the combustor liner and the condition of the parts inside the combustor liner as an image. It is possible to speed up and ensure the detection of a flame state defect such as blowout. As a result, valuable information can be obtained regarding the combustor parts other than during maintenance and inspection of the gas turbine, and the reliability and maintenance of the gas turbine during operation can be improved.

Further, since the cooling probe for accommodating the fiberscope is provided separately from the transition piece, the reaction force of the cooling probe from the transition piece,
There is no vibration and the reliability of the cooling probe is improved.
Further, since it is possible to cool the fiberscope by circulating cooling water in the cooling probe, compared to a conventional combustion flame monitoring device in which the compressor discharge air is further compressed and cooled to be the cooling medium of the fiberscope. The equipment can be simplified, and the controllability and reliability of the cooling medium supply can be significantly improved.

[Brief description of drawings]

FIG. 1 is a cut front view of an embodiment of the present invention.

FIG. 2 is a cut front view of a modified example of the embodiment.

FIG. 3 is a cutaway front view of the device disclosed in Japanese Patent Laid-Open No. 3-267617.

FIG. 4 is a cutaway plan view of a main part thereof.

FIG. 5 is a cut front view of the device disclosed in Japanese Patent Laid-Open No. 62-12823.

FIG. 6 is a schematic cross-sectional view of a device disclosed in Japanese Patent Laid-Open No. 2-404414.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fiberscope 2 ... Casing 3 ... Transition piece 4 ... Boss part 5 ... Cooling probe 6, 22 ... Image detecting part 7 ... Window plate 11 ... Flame detector 12 ... Combustor liner 13 ... Fuel supply pipe 14 ... Fuel nozzle 15 Combustion air 16 Combustion flame 21 First monitoring window 22 Image detector 23 Second monitoring window 24 Rise pipe 25 Piping 26 Cooling water 27 Television camera 28 Image output device 29 Field of view Range 30 ... Combustion gas 31 ... Turbine stationary blade 32 ... Turbine moving blade

Claims (3)

[Claims] 1. A cooling probe having a water cooling function, the cooling probe having an axis perpendicular to a gas turbine combustor casing axis, accommodating a fiberscope and an image detector, and having a first monitoring window facing the image detector, The first monitoring window is opposed to a second monitoring window provided on the transition piece of the turbine combustor so as to be able to monitor the upstream in the axial direction of the combustor liner substantially along the axis of the transition piece. A combustion flame monitoring device for a gas turbine combustor, which is mounted on a casing. 2. A transparent window plate made of quartz glass or the like is attached to the first monitoring window, and the second monitoring window lacks the window plate, and a dilution air port is provided in the second monitoring window. The combustion flame monitoring device for a gas turbine combustor according to claim 1, which has the function of 3. A combustion flame monitor for a gas turbine combustor according to claim 1, wherein the optical information transmitted by the fiberscope is imaged by a television camera so that the information in the combustion chamber can be remotely monitored. apparatus.