JPH1038274A - Combustion state monitor for gas turbine combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion state monitor set for a gas turbine combustor which is simple in structure and easy in maintenance by constituting a plurality of conductors as one circuit and providing a detection means which detects the electrical properties of the circuit. SOLUTION: For example, in the case when a flame-failure occurs in a premixing sector 9-3 of a combustor, combined resistance (A and B) drops as compared with the combined resistance (A and B) during normal time. The combustion flow rate is reduced. If a flame falure does not occur in the pre- mixing sector 9-4 at that time, the resistance of a conductor 4 also drops. The combined resistance (A and B) drops as well. If the combined resistance (A and B) drops, the operation will be normal, then the combustion flow rate of the premixing sector 9-4 is returned to a specified value. Then, the combustion flow rate of the pre-mixing sector will be reduced. Since the pre-mixing sector 9-3 is in a flame failure state at that time, the resistance of the conductor 3 will not make any substantial change so that the combined resistances (A and B) may be subjected to basically no changes. Thus, the flame failure of the premixing sector (A, B) is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine combustor, and more particularly to a combustion state monitoring device for a gas turbine combustor which detects a combustion state inside the gas turbine combustor and judges an operation state of the combustor. .

[0002]

2. Description of the Related Art Exhaust gas discharged from a gas turbine combustor contains NOx, CO, and the like that cause air pollution, and strict emission regulations are set for these. Therefore, in the gas turbine combustor, in order to reduce NOx, the fuel is distributed in multiple stages to reduce the combustion load per stage,
The lean premixed combustion suppresses the partial high-temperature region,
We are trying to reduce NOx. Most gas turbine combustors use both diffusion combustion and premixed combustion in which fuel and air are premixed inside the mixer and burn them.However, in recent years, premixed combustion has been performed in a high load region to further reduce NOx. It tends to increase the ratio. In general, if the combustor is configured to increase the premixed combustion ratio in the high load region, the cross-sectional area of the flow path of the premixer increases, and unburned components may be generated in the low load region. Technology to prevent this is needed. For this reason, the premixer is divided into a plurality of sectors, and by controlling the fuel flow supplied to each sector according to the load, the local fuel-air ratio in each sector is controlled to achieve stable combustion. . As described above, when the combustion region is divided into a plurality of regions, it is necessary to operate while satisfying the exhaust gas performance such as ignition, transfer to each sector, and combustion stability. For this reason, in the prior art, as a sensing technique for judging whether or not the combustor is in a normal operation state, a technique using a temperature sensor such as a thermocouple or a technique disclosed in JP-A-63-263427 is used. And those that monitor the flame state optically.

[0003]

The method of detecting the combustion state of a combustor using a thermocouple is very effective in terms of reliability and cost. However, as described above, low N
In the Ox combustor, the premixer may be divided into a large number of sectors, and thermocouples are required in the number of sectors in order to accurately grasp the flashover of each sector. Furthermore, it is necessary to install a plurality of thermocouples per sector in consideration of reliability. In the case of large gas turbines for power generation,
Since 10 to 16 cans are arranged per axis,
The number of thermocouples per axis becomes enormous, and it is necessary to improve the detection method from the viewpoint of both cost and maintenance.
In addition, the method of optically monitoring the flame state has a problem that the equipment becomes large, maintenance is difficult, and reliability is lacking.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide a combustion state monitoring device for a gas turbine combustor that has a simple structure, is low in cost, and easy to maintain when detecting the combustion state of the gas turbine combustor. Is to provide.

[0005]

In order to achieve the above object, in a gas turbine combustor, a plurality of conductors whose electric properties change with temperature are provided at different positions on the outer peripheral wall of an inner cylinder of the combustor. And a means for detecting the electrical properties of the plurality of conductors as a single circuit. Further, based on the output of the means for detecting the electrical properties of the circuit, a discriminating means for specifying the position of the inner cylinder of the combustor having a temperature change is provided, and the premixed combustion divided into a plurality of sectors is performed. The ignition status of the premix burner to be performed is determined. In addition, a determination means for specifying the position of the inner cylinder of the combustor in which a temperature change has occurred based on an output of a means for detecting an electrical property of the circuit is provided, and a fuel supply for supplying fuel to a premix burner is provided. Means for controlling the system, and sequentially switching the fuel to be supplied to a plurality of sectors, while referring to the output of the means for detecting the electrical properties of the circuit, referring to the output of the premix generated during the rated combustion state of the combustor. Identify burner misfire or abnormal combustion. Here, the determination means is:
The relationship between the normal combustion state of the premix burner that performs premix combustion divided into a plurality of sectors and the electrical properties of the circuit in the combustion state is grasped in advance. Further, the plurality of conductors are housed in a metal protection tube, and the conductors are arranged at positions different in the axial direction of the metal protection tube and respectively corresponding to the plurality of sectors. In addition, a metal conduit is installed on the outer peripheral wall of the inner cylinder of the combustor, a communication hole communicating with the inside of the outer cylinder is provided in the outer cylinder of the combustor, and one end of the metal conduit is connected to the outer cylinder through the communication hole. Guided outside and fixed,
A plurality of conductors whose electrical properties change depending on temperature are inserted from the entrance end of the metal conduit, and the conductor is provided at the entrance end of the metal conduit so that the conductors can be fixed and detached.

According to the present invention, in detecting a temperature change in a premixer sector of a combustor, the detecting means includes a plurality of conductors whose electric resistance changes according to the temperature, a semiconductor or a thermocouple which generates an electromotive force due to the temperature change. Are configured as one circuit. For this reason, the structure as the temperature detecting means is simplified, and the cost and maintenance are effective. The present invention also relates to a plurality of conductors such as a semiconductor or a thermocouple that generates an electromotive force due to a temperature change, each of which corresponds to a plurality of premixer sectors. And a metal protection tube can be attached to the inner cylinder from the outside of the outer cylinder of the combustor. This makes it possible to easily replace the conductor, the semiconductor, or the thermocouple without disassembling the combustor even if the conductor, the semiconductor, or the thermocouple is broken, thereby simplifying the maintenance. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a combustion state monitoring device for a gas turbine combustor according to an embodiment of the present invention. In FIG.
1 shows a main part of a gas turbine plant. The gas turbine plant mainly includes a gas turbine 12 and a gas turbine 1.
2, a compressor 11 for obtaining compressed air for combustion,
It is composed of a combustor 13. The compressed air discharged from the compressor 11 is guided to the combustor 13 and burns together with fuel in a combustion chamber 14 formed inside the combustor inner cylinder 7.
The combustion gas generated by the combustion is injected into the gas turbine 12 via the transition piece 15, and drives the gas turbine 12. Although not shown, power is generally generated by a generator connected to the gas turbine 12. The main configuration of the combustor 13 includes an inner cylinder 7 that generates combustion gas, a diffusion burner 8 that is arranged at the center of the inlet end axis of the inner cylinder 7 to perform diffusion combustion, and a plurality of premix combustion that performs premix combustion on the outer peripheral side thereof. And a fuel supply system 19 (control valves 19-1 to 19-4) for supplying fuel to the diffusion burner 8 and the premix burner 9 is provided. ) Is installed. Also,
Reference numeral 1 denotes a plurality of conductors whose electrical properties change according to temperature, including a conductor or a semiconductor whose electric resistance changes according to temperature such as platinum or thermistor, and a conductor such as a thermocouple which generates an electromotive force according to temperature change. . 17 represents a discriminator, and 18 represents a fuel controller.

FIG. 2 is a schematic view of a sectional view taken along line aa of FIG. In the present embodiment, the sectors 9-1 and 9 of the premix burner 9 are used.
Conductors 1, 2, 3, and 4 whose electric resistance changes depending on temperature are installed on the outer peripheral wall of the inner cylinder 7 corresponding to -2, 9-3, and 9-4. A bridge circuit is configured, and ohmmeters 5 and 6 for detecting electric resistance between the contacts A and B or between C and D are installed. Further, as shown in FIG. 1, a discriminator 17 for specifying a premixer sector in which a temperature change (combustion state change) has occurred due to a change in the combined resistance detected by the ohmmeter 5 or the ohmmeter 6, and its discrimination. Fuel controller 18 for controlling fuel supply system 19 based on the result
Is installed.

The method of operating a gas turbine to which the present invention is applied generally performs diffusion combustion with excellent combustion stability at the time of startup, and performs premix combustion as the gas turbine load increases. FIG. 3 shows the gas temperature and the metal temperature characteristics of the inner cylinder 7 and the combined resistance R detected by the resistance meter 5.
The behavior of (A, B) is shown. Hereinafter, the operation of the gas turbine, the metal temperature behavior of the inner cylinder 7, and the combined resistance R (A, B) detected by the resistance meter 5 will be described. When starting the gas turbine (point E), the diffusion burner 8 having excellent combustion stability is used. Since the diffusion burner 8 is disposed at the center of the axis of the combustor 13, the metal temperature of the inner cylinder 7 tends to be substantially uniform in the circumferential direction as indicated by E in (3-2), and the metal temperature increases rapidly. Do not rise. Normally, the conductors 1, 2, 3, and 4 exhibit characteristics in which the electrical resistance increases as the temperature increases. The combined resistance R (A, B) is also equal to the inner cylinder 7 as indicated by E in (3-1).
In the same manner as the behavior of the metal temperature. Gas turbine 1
With the load increase of 2, the premixer sector 9-1 starts combustion (point F). At the same time, the fuel supply to the diffusion burner 8 is reduced as shown. At this point F, the premixer sector 9
Since -1 is disposed near the inner cylinder 7, when the premixer sector 9-1 starts combustion, the metal temperature (3-2) of the inner cylinder 7 rises rapidly (point F to point G). . And
Fuel flow supplied to premixer sector 9-1 (3-3)
Is constant (point G), the metal temperature change is stabilized.
As for the metal temperature of the inner cylinder 7, only the temperature at the position corresponding to the premixer sector 9-1 sharply increases. As a result, only the resistance of the conductor 1 changes greatly, and as a result, the combined resistance R
(A, B) also changes from the area F of (3-1) to the area G. Next, the premixer sector 9-2
Starts combustion (point H) (3-3), the metal temperature (3-2) of the inner cylinder 7 corresponding to the premixer sector 9-2 becomes H
And rises sharply to point I. And premixer sector 9
When the fuel flow rate (3-3) supplied to -2 becomes constant (point I), the metal temperature change also becomes stable. Therefore, the conductor 2
Increases, and as a result, the combined resistance R (A, B)
Increases from the state of the area G to the state of the area I as shown in (3-1). When the premixer sector 9-3 starts combustion (point J), the combined resistance R (A, B) further increases from the state in the region I and changes to the state in the region K. Finally,
When the premixer sector 9-4 starts combustion (point L), the combined resistance R (A, B) further increases from the state in the area K and stabilizes in the area M in the rated combustion state.

Therefore, first, in the ignition combustion state,
A case where an abnormality in the ignition state of the premixer sector is detected will be described. First, the discriminator 17 includes a normal premix burner 9.
The relationship between the combustion state and the combined resistance R (A, B) is grasped in advance as shown in FIG. Next, the fuel is ignited while fuel is sequentially injected into each premixer sector. The discriminator 17 detects the combined resistance R (A, B) at the time of ignition,
The detected combined resistance R (A, B) is compared with the combined resistance R (A, B) in a normal state to detect whether or not there is an abnormality in the combustion state of each premix burner 9. That is, for example, the combustor 13
If fuel is supplied to the pre-mixer sector 9-1, and the detected combined resistance rises as in the case of a normal state, it means that the pre-mixer sector 9-1 has burned normally, and the resistance is reduced. If it does not change, it means that premixer sector 9-1 does not fire. As described above, in the present embodiment, a plurality of conductors whose electric resistance changes depending on the temperature are configured to be one circuit, and while the fuel is supplied to the premixer sector, the entire premixer sector is determined in the discriminator 17. By comparing and examining the change in the combined resistance of the premixed burners with the combined resistance R (A, B) under normal conditions, it is possible to detect the presence or absence of an abnormality in the combustion state of each premix burner, which is extremely advantageous in terms of cost and maintenance. Becomes

Usually, a plurality of combustors are installed for each shaft in the gas turbine 12. In this case, the fuel is supplied to the premixer sector of each combustor while the total combustor is combined. The change in resistance is compared and examined in the discriminator 17.
The combined resistance R (A, B) of each combustor is compared, and if the combined resistance of each combustor increases, it means that the combustion has been performed normally.
If the resistance does not change, it means that the premixer sector of the combustor with no change in resistance will not ignite. For example, in the operating state at point F, the premixer sector 9-1 of the first combustor
Is not ignited, the combined resistance R of the other combustor
Although (A, B) rises, the combined resistance R (A, B) of the first combustor does not rise. The discriminator 17 compares the combined resistance R (A, B) between the first combustor and the other combustor,
It is detected that the premixer sector 9-1 of the first combustor having no resistance change does not ignite. In this manner, in the present embodiment, a plurality of conductors whose electric resistance changes according to the temperature are configured as one circuit, and while the fuel is supplied to the premixer sector of each combustor, the entire combustor is By comparing and examining the change in the combined resistance in the discriminator 17, it is possible to detect whether or not there is an abnormality in the ignition state of each of the premix burners in each of the combustors. This is advantageous. Note that, even when a plurality of combustors are installed per shaft of the gas turbine 12, as described above, the discriminator 17 sets the combustion state of the premix burner 9 and the normal state of the combined resistance R (A, B). Is grasped in advance as shown in FIG. 3 and is compared with the detected combined resistance R (A, B) of each of the plurality of combustors, whereby abnormality of the ignition state of each premix burner of each combustor is obtained. It is needless to say that it is possible to detect the presence / absence of an error.

Next, a description will be given of the detection of a misfire in one of the premixer sectors in the rated combustion state and the corresponding measures. When the premixer burner partially misfires, the temperature of the misfiring sector decreases, and thermal stress concentrates on the boundary. Therefore, it is necessary to detect the misfiring sector promptly and take action. In the case of this embodiment, because of low NOx,
In the rated combustion state, the diffusion combustion ratio is made as small as possible. For this reason, the influence of the diffusion combustion on the metal temperature of the inner cylinder 7 is reduced. Therefore, the combustion state of the premixer sector appears sensitively to the combined resistance R (A, B), and if any of the premixer sectors misfires, the combined resistance R (A, B) decreases. A misfire can be easily determined. First, description will be made on the assumption that a misfire occurs in the premixer sector 9-3 of the combustor 13 in FIG. When the premixer sector 9-3 of the combustor 13 misfires, the combined resistance R (A, B) at this time is a combined resistance R (A, Lower than B). Therefore, in order to detect a misfiring premixer sector, the fuel controller 18 adjusts the fuel control valve 19-4 of the premixer sector 9-4 to reduce the fuel flow rate. At this time, if the premixer sector 9-4 has not misfired, the metal temperature of the inner cylinder 7 decreases, the resistance of the conductor 4 also decreases, and as a result, the combined resistance R (A, B) decreases. Combined resistance R
If (A, B) decreases, it is normal and the fuel controller 18
Thus, the fuel control valve 19-4 of the premixer sector 9-4 is adjusted to return the fuel flow to a predetermined value. Next, the fuel flow rate of the premixer sector 9-3 is similarly reduced. At this time, since the premixer sector 9-3 has misfired, the resistance of the conductor 3 hardly changes, and therefore the combined resistance R (A, B) hardly changes. This detects that the premixer sector 9-3 has misfired. Therefore, if the above operation is performed for each premixer sector, it is possible to specify the premixer sector of the combustor that has misfired.

The case where a plurality of combustors are installed for one shaft of the gas turbine 12 will be described on the assumption that the premixer sector 9-3 of the first combustor is misfired. If the premixer sector 9-3 of the first combustor misfires, the combined resistance R (A, B) drops to about 3/4 of the other combustors that have not misfired. Therefore, in order to detect a misfiring premixer sector, the fuel controller 18 adjusts the fuel control valve 19-4 of the premixer sector 9-4 to reduce the fuel flow rate. At this time, if each premixer sector 9-4 has not misfired, the metal temperature of the inner cylinder 7 decreases, and the resistance of the conductor 4 also decreases. As a result, the combined resistance R (A, B) decreases. If the combined resistance R (A, B) decreases in all combustors,
Normal, premixer sector 9 by fuel controller 18
The fuel flow control valve 19-4 is adjusted to return the fuel flow rate to a predetermined value. Next, the fuel flow rate of the premixer sector 9-3 is similarly reduced. The combined resistance R (A, B) of the combustor in which the premixer sector 9-3 does not misfire decreases because the resistance of the conductor 3 decreases, but the premixer sector 9-3 misfires. Since the resistance of the conductor 3 hardly changes in the first combustor, the combined resistance R (A, B) hardly changes, and
It is determined that the premixer sector 9-3 of the #th combustor has misfired, and this is detected. Therefore, if the above operation is performed for each premixer sector of a plurality of combustors, it is possible to specify the premixer sector of the combustor that has misfired. Note that, even when a plurality of combustors are installed per shaft of the gas turbine 12, as described above, the discriminator 1
7 shows the combustion state of the premix burner 9 and the resultant resistance R (A, B).
As shown in FIG. 3, the relationship of the normal condition of the premixer of the misfiring combustor is determined by comparing in advance with the composite resistance R (A, B) of each of the plurality of detected combustors. The sector can be specified.

As described above, according to the embodiment of the present invention,
Although the bridge circuits 2, 3, and 4 are configured, there is no problem if the respective conductors are connected in series or in parallel. Further, as an embodiment of the present invention, the partial misfire is detected by the combined resistance R (A, B) between the contacts A and B.
The same applies to the detection by the combined resistance R (C, D) between D, and furthermore, the premixer sector misfired by combining the information of the combined resistances R (A, B) and R (C, D). It is also possible to specify. Here, when the conductors 1, 2, 3, and 4 are installed in the inner cylinder 7, their axial positions are as follows.
The position where the metal temperature changes highest is good.
The central portion of each premixer sector, which is less susceptible to the flames of adjacent premixer sectors, is preferred.

FIG. 4 shows another embodiment of the present invention. The present embodiment is an example in which a thermocouple that generates an electromotive force by a temperature difference between a temperature measuring contact and a reference junction is used as a conductor for detecting a temperature. 24 to improve airtightness and mechanical strength. In FIG. 4, four thermocouples 20, 21, 22, 23 are arranged inside a metal protection tube 24, and respective temperature measuring contacts 25, 26, 27, 28 are spaced apart from each other in the axial direction of the metal protection tube 24 ( The metal protection tube 24 is filled with magnesium oxide 29 in order to increase the insulation and mechanical strength of each thermocouple. The reference contacts of each thermocouple are connected in series, and a wattmeter 31 for detecting electromotive force at both ends is provided. Here, since the thermocouple detects the electromotive force generated by the temperature difference between the temperature measuring contact and the reference junction, it is preferable to arrange the reference contact portions 30 of the four thermocouples in a place where there is no temperature change. When the metal protection tube 24 is attached to the inner cylinder 7, each of the temperature measuring contacts 2
It is fixed to the outer peripheral wall of the inner cylinder 7 so that 5, 26, 27 and 28 are located at the center of the premixer sector.

The principle of operation of the present embodiment is basically the same as that of the embodiment of FIG. 2, and when the premixer sector starts burning, a large electromotive force is generated in the thermocouple corresponding to the position, As a result, the output of the wattmeter 31 changes. The output power value (not shown) of the wattmeter 31 in the normal combustion state of the premix burner 9 whose output value is grasped in advance.
Or by comparing one of the gas turbines 12
When a plurality of combustors are installed per shaft, it is possible to detect abnormalities in the ignition state of the premixed burner by comparing the output values of the other combustors. And the misfiring premixer sector can be identified. Also in the present embodiment, since a plurality of thermocouples whose electromotive force changes according to the temperature are configured as one circuit, the structure is simplified and the cost and maintenance are very advantageous.

FIG. 5 shows another embodiment of the present invention, in which a means and a method for attaching a metal protection tube 24 containing a thermocouple to the inner cylinder 7 are shown. In FIG.
A metal conduit 32 having good heat conduction is fixed to the outer peripheral wall where the metal temperature rises as shown in the figure, and a communication hole 33 communicating with the inside of the outer cylinder is provided in the outer cylinder 16. Is guided to the outside of the outer cylinder 16 through the communication hole 33, and the metal conduit 32 is fixedly sealed to the outer cylinder 16 by the joint 35.
The metal protection tube 24 with a built-in thermocouple shown in FIG. 4 is inserted from the inlet end 34 of the metal conduit 32, and the metal protection tube 24 is fixed to the metal conduit 32 at a predetermined position by a joint 36. In this case, four thermocouples 2 installed inside the metal protection tube 24 are used.
0, 21, 22, and 23, respectively.
6, 27 and 28 are premixer sectors 9-1 and 9 respectively.
-2, 9-3, and 9-4 are arranged at intervals corresponding to the positions. By this means and method, the four thermocouples 20, 21, 22, 23 installed inside the metal protection tube 24 are respectively connected to the premixer sectors 9-1, 9-2, 9-3, 9-.
4 and the thermocouple can be attached to the inner cylinder 7 from the outside of the outer cylinder 16 without breaking down the combustor even if the thermocouple is broken. Can be easily replaced, which is very advantageous in terms of maintenance. It is needless to say that this means and method can be applied to the mounting of a conductor or a semiconductor whose electric resistance changes with temperature, such as platinum or thermistor shown in FIG.

[0018]

As described above, according to the present invention,
In detecting the temperature change in the premixer sector of the combustor, the detection means is composed of multiple conductors whose electric resistance changes according to temperature, semiconductors or conductors such as thermocouples which generate electromotive force due to temperature change as one circuit. The configuration simplifies the structure and is effective in terms of both cost and maintenance. Further, by specifying the premixer sector of the combustor in which the temperature change (combustion state change) has occurred, a dangerous operation state can be avoided by the fuel control system, and the gas turbine can be safely operated. Further, according to the present invention, a plurality of conductors such as semiconductors or thermocouples that generate an electromotive force due to a temperature change are provided to a plurality of premixer sectors, respectively, a plurality of conductors whose electric resistance changes according to temperature installed inside the metal protection tube. And a metal protective tube can be attached to the inner cylinder from the outside of the outer cylinder of the combustor, so that even if the conductor such as a conductor, a semiconductor, or a thermocouple is broken, the combustor Without disassembling, conductors such as conductors, semiconductors or thermocouples can be easily replaced, thereby simplifying maintenance.

[Brief description of the drawings]

FIG. 1 is a combustion state monitoring device for a gas turbine combustor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating details of an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of a gas turbine to which the present invention is applied and changes in the metal temperature and the combined resistance of an inner cylinder.

FIG. 4 shows another embodiment of the present invention.

FIG. 5 shows another embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3, 4 Conductor 5, 6 Resistance meter 7 Inner cylinder 8 Diffusion burner 9 Premix burner 9-1, 9-2, 9-3, 9-4 Premixer sector 11 Compressor 12 Gas turbine 13 Combustion Instrument 16 Outer cylinder 17 Discriminator 18 Fuel controller 20, 21, 22, 23 Thermocouple 24 Metal protection tube 31 Wattmeter 32 Metal conductor 33 Communication hole 35, 36 Joint

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoya Murota 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Narika Kobayashi Omika, Hitachi City, Ibaraki Prefecture 7-2-1, Machi-cho, Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Fumiharu Moriwaki 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref., Ltd., Hitachi Plant, Hitachi, Ltd.

Claims (7)

[Claims] 1. A diffusion burner for performing diffusion combustion, a premix burner for performing premix combustion divided into a plurality of sectors, a fuel supply system for supplying fuel to the diffusion burner and the premix burner, and a combustion gas. In a gas turbine combustor composed of an inner cylinder to be generated and an outer cylinder forming a flow path of compressed air outside the inner cylinder, electrical properties of the inner cylinder at different positions on the outer peripheral wall of the inner cylinder depend on temperature. While installing a plurality of conductors that change, and configuring the plurality of conductors as one circuit,
A combustion state monitoring device for a gas turbine combustor, comprising: means for detecting an electrical property of the circuit. 2. The conductor according to claim 1, wherein the conductor is a platinum or thermistor conductor whose electric resistance changes with temperature.
Alternatively, a combustion state monitoring device for a gas turbine combustor, which is a thermocouple that generates an electromotive force according to a temperature change. 3. A method according to claim 1, further comprising the step of: determining a position of the inner cylinder of the combustor in which a temperature change has occurred based on an output of the means for detecting an electrical property of the circuit. A combustion state monitoring device for a gas turbine combustor, wherein the ignition state of a premix burner that performs premix combustion divided into the plurality of sectors is determined. 4. A discriminating means according to claim 1 or 2, wherein a discriminating means for specifying a position of an inner cylinder of said combustor in which a temperature change has occurred is provided based on an output of a means for detecting an electrical property of said circuit. Together with means for controlling a fuel supply system for supplying fuel to the premix burner, while sequentially switching fuel to be supplied to the plurality of sectors, while referring to the output of the means for detecting the electrical properties of the circuit. A combustion state monitoring device for a gas turbine combustor, wherein misfire or abnormal combustion of the premix burner which occurs during a rated combustion state of the combustor is specified. 5. The normal combustion state of a premix burner that performs premix combustion divided into the plurality of sectors, and a determination of the circuit in the combustion state according to claim 3 or 4. A combustion state monitoring device for a gas turbine combustor, wherein a relationship between electrical properties is grasped in advance. 6. The metal protection tube according to claim 1, wherein the plurality of conductors are accommodated in a metal protection tube, and the conductors correspond to the plurality of sectors which are different in an axial direction of the metal protection tube. A combustion state monitoring device for a gas turbine combustor, wherein the combustion state monitoring device is disposed at a predetermined position. 7. A diffusion burner for performing diffusion combustion, a premix burner for performing premix combustion, an inner cylinder for generating combustion gas,
In a gas turbine combustor comprising an outer cylinder forming a flow path of compressed air outside the inner cylinder, a metal conduit is installed on an outer peripheral wall of the inner cylinder, and the outer cylinder communicates with the inside of the outer cylinder. A communication hole is provided, one end of the metal conduit is guided to the outside of the outer cylinder through the communication hole, and fixed, and a plurality of conductors whose electrical properties change depending on temperature from the inlet end of the metal conduit are inserted. A combustion state monitoring device for a gas turbine combustor, comprising: means for fixing and detaching the conductor at an inlet end of the metal conduit.