JPH11200890A - Air supplier for gas turbine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air/fuel ratio from lowering down temporarily to the minimum air/fuel ratio or less holding a flame of a combustor, when interruption of a load is generated in a gas turbine device. SOLUTION: An inlet guide blade 26 adjusting an amount of air flowing in a compressor 21 by changing an opening is provided with a control device 1 controlling the opening thereof. In this control device 1, in a load interruption detector 2, generation of load interruption is detected, in a single shot generator 3, this detection signal is converted into 1 pulse signal to be output, in a timer 4, when an input signal is given, a switching signal is generated, after the lapse of preset time, this output is cut, an analog signal switch 5, during inputting of the switching signal, outputs a preset value placing an opening of the inlet guide blade 26 in a specified opening α% sufficiently smaller than a maximum opening MAX%, in a low value select circuit 6, a low value in any of an output signal of the signal switch 5 and a control signal of an adjuster 39 is selected to be output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine device for power generation, and more particularly, to air for a gas turbine device that generates combustion gas using a low NOx combustor that suppresses the generation of nitrogen oxides (hereinafter, referred to as NOx). It relates to a supply device.

[0002]

2. Description of the Related Art In a gas turbine apparatus for power generation, a low NOx is applied to a combustor for generating a high temperature combustion gas of a gas turbine.
A combustor is employed. This low NOx combustor uses a premixed combustion method to reduce NOx in the exhaust gas of the gas turbine. When the combustion temperature reaches a predetermined temperature in the process of increasing the load of the gas turbine, the combustion mode is diffused combustion. The combustion state is optimized by shifting from the premixed combustion to the premixed combustion.

FIG. 7 shows an air supply device of a gas turbine device capable of performing a premix combustion method. This gas turbine device includes a compressor 21, a gas turbine 22, and a combustor 2.
3 is provided. The combustor 23 generates high-temperature combustion gas from a mixture of combustion air supplied from the compressor 21 and fuel sent from the fuel system 24,
To supply. That is, the intake air is guided to the inlet of the compressor 21 through the air system 25, and at this time, passes through the inlet guide vanes 26 provided at the inlet. This air is compressed while passing between the moving blade and the stationary blade (both not shown) in the compressor 21 and is supplied to the combustor 23.

On the other hand, fuel is supplied from a fuel system 24 through a fuel cutoff valve 27 and a fuel control valve 28. further,
The fuel is branched into a premixed fuel system 29 at the inlet of the combustor 23.
Through the premixed fuel control valve 30 and the diffusion fuel system 3
From 1, the fuel is supplied to the combustor 23 through the diffusion fuel control valve 32.

[0005] In the combustor 23, the high-temperature air and the fuel are mixed to form an air-fuel mixture, which is further combusted into a high-temperature combustion gas. The generated combustion gas is used as a working medium in the gas turbine 2
2 is supplied. This combustion gas expands in the gas turbine 22, and the work drives the generator 33 to generate an electric output. The exhaust gas discharged from the gas turbine 22 flows into an exhaust gas system 34 and is guided to an exhaust heat recovery boiler (not shown).

A control device 35 is provided in the illustrated inlet guide vane 26, and a temperature detector 36 for detecting the exhaust gas temperature is provided.
The guide vane driving means 37 is operated based on the deviation between the exhaust gas temperature signal and the set value to change the amount of air flowing into the compressor 21.

FIG. 8 shows the details of the control device 35.
The controller 35 includes a subtractor 38 for calculating a deviation between the exhaust gas temperature signal from the temperature detector 36 and the set value, and a guide vane driving means 37 for operating the inlet guide vanes 26 so that the deviation becomes zero. And a controller 39 for outputting a command signal. For example, when the exhaust gas temperature signal from the temperature detector 36 is higher than a set value, the controller 39 is controlled according to the deviation.
Outputs an opening command signal for increasing the opening of the entrance guide wing 26. At this time, the inlet guide vanes 26 are opened by the guide vane driving means 37, the amount of air flowing into the compressor 21 increases, and as a result, the amount of combustion air supplied to the combustor 23 increases, and the temperature of the combustion gas decreases. . For this reason, the exhaust gas temperature of the gas turbine 22 decreases, and the temperature signal detected by the temperature detector 36 also indicates a low value.

On the other hand, when the exhaust gas temperature signal is lower than the set value, the controller 39 outputs an opening command signal for reducing the opening of the inlet guide vane 26. At this time, the guide vanes 26 operate in the closing direction, the amount of air flowing into the compressor 21 decreases, and as a result, the amount of combustion air supplied to the combustor 23 decreases, and the temperature of the combustion gas from the combustor 23 decreases. It gets hot.
For this reason, the exhaust gas temperature of the gas turbine 22 rises, and the detected temperature signal also shows a high value.

In this way, the opening degree of the inlet guide vanes 26 is changed by the operation of the control device 35, and the air supply amount is adjusted to maintain the exhaust gas temperature of the gas turbine 22 properly.

On the other hand, the fuel supply amount is controlled by the premixed fuel control valve 30.
And the opening degree of the diffusion fuel control valve 32 is controlled and adjusted together. In FIG. 9, the diffusion fuel control valve 32 as shown by the curve J is used until the gas turbine load reaches a predetermined value β% from zero.
Is kept fully open (100%), at this time, the fuel is adjusted by the fuel control valve 28 and the premixed fuel control valve 3
In the case of 0, the degree of opening is maintained in the fully closed state (0%). Next, when the gas turbine load exceeds β%, the diffusion fuel control valve 3
2 operates in the closing direction, and at the same time, the premixed fuel control valve 30
Starts to open and gradually increases the opening as shown by the curve K.
Thereafter, the opening degree of the diffusion fuel control valve 32 becomes small, while the opening degree of the premixed fuel control valve 30 is sufficiently large to complete the transition from diffusion combustion to premixed combustion. In this way, the fuel supply amount is properly maintained while changing the intermediate combustion method to a premixed combustion method desirable for reducing NOx in accordance with an increase in the gas turbine load.

[0011]

In the gas turbine apparatus described above, the premixed fuel control valve 30 is mainly used.
When the load is interrupted when the fuel is supplied by the above, the fuel must be switched so that the total amount of fuel to the combustor 23 is adjusted by the diffusion fuel control valve 32. From the occurrence of load shedding to the final adjustment of the total fuel amount by the diffusion fuel control valve 32, the following process is performed.
In the case of No. 3, the flame cannot be maintained, and there is a possibility that a misfire occurs.

That is, when load shedding occurs, FIG.
As shown in (a), the fuel control valve 28 is sharply reduced to the minimum flame holding opening in order to suppress the overspeed of the gas turbine 22 as shown by the curve A. At the same time, as shown by the curve B, the diffusion fuel control valve 32 is opened from a predetermined opening degree until it is fully opened. Further, as shown by the curve C, the premixed fuel control valve 3
0 is narrowed down from a predetermined opening to an opening of 0% through which fuel does not pass. At this time, the fuel supply amount of the inlet guide vanes 26 decreases due to the closing operation of the fuel control valve 28 due to the occurrence of load interruption, whereby the exhaust gas temperature decreases and gradually closes as shown by the curve D.

With the above-mentioned transition, the premixed fuel control valve 30 is closed and the opened diffusion fuel control valve 32 is used instead to control the fuel. The amount of air takes a little time before the entrance guide vanes 26 close, which causes a delay. That is, as shown in FIG. 10B, when the premixed fuel control valve 30 starts to be closed at the same time as the occurrence of load shedding, the fuel rapidly decreases as shown by the curve E. Further, the diffusion fuel control valve 32 is opened, and the fuel increases as indicated by the curve F.

On the other hand, it takes a little time for the temperature of the exhaust gas from the gas turbine 22 to decrease, and the flow rate does not change for a while even after the load shedding occurs as shown by the curve G. This is because it takes about several seconds until the opening degree command signal is output from the controller 39 and the inlet guide vane 26 starts operating based on the detection of the decrease in the exhaust gas temperature signal. Inlet guide wing 2
Even if the fuel cell 6 is operated to close, the flow rate gradually decreases and cannot follow the decrease in the fuel, and the minimum fuel-air ratio (fuel amount / air amount) for temporarily holding the flame of the combustor 23 is maintained. )
Is not maintained, and the combustor 23 is misfired.

Accordingly, an object of the present invention is to provide a gas turbine which reliably prevents the fuel-air ratio from temporarily dropping below a minimum fuel-air ratio that temporarily holds the flame of a combustor when load shedding occurs. An object of the present invention is to provide an air supply device.

[0016]

In order to achieve the above object, the invention according to claim 1 directs air to a compressor to generate high-pressure combustion air, and guides the obtained high-pressure air to a combustor. A gas turbine configured to mix with a fuel to generate an air-fuel mixture, burn the air-fuel mixture to generate a high-temperature combustion gas, and supply the obtained combustion gas to the gas turbine to obtain power. The apparatus includes an inlet guide vane that adjusts the amount of air flowing into the compressor by changing an opening degree, and a control device that controls the opening degree of the inlet guide vane, and the control device detects the exhaust gas of the gas turbine. A controller for creating a control signal for adjusting the opening of the inlet guide vane based on the deviation between the temperature signal and the set value; and a switch signal when a load shedding signal is given, and outputting the output after a lapse of the set time. Shutdown timer and switching signal During input, a signal switch that outputs a set value that sets the opening of the inlet guide vane to a specified opening that is sufficiently smaller than the maximum opening, and any one of the output signal of the signal switch and the control signal of the controller that is low. And a low value selection circuit for selecting and outputting a value.

In the air supply device having the above-described structure, when load interruption occurs, the amount of air flowing into the compressor is reduced due to rapid closing of the inlet guide vanes. As a result, the amount of air supplied to the combustor can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained.

Further, in the invention according to claim 2, air is guided to a compressor to generate high-pressure combustion air, and the obtained high-pressure air is guided to a combustor, and mixed with fuel to generate an air-fuel mixture. At the same time, the air-fuel mixture is burned to generate high-temperature combustion gas,
In a gas turbine device configured to obtain the power by supplying the obtained combustion gas to a gas turbine, an inlet guide vane that adjusts the amount of air flowing into the compressor by changing an opening degree, It is characterized by comprising a bypass system connecting the outlet with the exhaust gas system of the gas turbine, and an exhaust valve interposed in the bypass system.

In the air supply device having the above configuration, when load interruption occurs, a part of the air in the compressor flows out to the exhaust gas system of the gas turbine due to the rapid opening of the exhaust valve. As a result, the amount of air supplied to the combustor can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained.

Further, the invention according to claim 3 is provided with a control device for controlling the exhaust valve, and when the load interrupt signal is given, the control device outputs a signal for rapidly opening the exhaust valve, and the set time elapses. It is characterized by having a timer for cutting off the output later.

In the air supply device having the above-described structure, when the load is cut off, a part of the air in the compressor flows out to the exhaust gas system of the gas turbine by rapidly opening the exhaust valve. As a result, the amount of air supplied to the combustor can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained.

Further, the invention according to claim 4 is provided with a control device for controlling the inlet guide vanes and the exhaust valve, and the control device controls the inlet guide based on a difference between a detected exhaust gas temperature signal of the gas turbine and a set value. A regulator for generating a control signal for adjusting the opening of the blade, a timer for outputting a switching signal and a signal for rapidly opening the exhaust valve when a load shedding signal is given, and for turning off the output after a lapse of a set time; During the input of the switching signal, a signal switch for outputting a set value for setting the opening of the inlet guide vane to a specified opening sufficiently smaller than the maximum opening, and any one of an output signal of the signal switch and a control signal of the controller. And a low value selection circuit for selecting and outputting the low value.

In the air supply device having the above structure, when load interruption occurs, the amount of air flowing into the compressor is reduced by the rapid closing of the inlet guide vanes, and at the same time, the exhaust valve is rapidly opened. Some of the air flows out into the exhaust gas system of the gas turbine. As a result, the amount of air supplied to the combustor can be greatly reduced in both cases, and the minimum fuel-air ratio can be more reliably maintained.

According to a fifth aspect of the present invention, air is guided to a compressor to generate high-pressure combustion air, and the obtained high-pressure air is guided to a combustor to be mixed with fuel to generate an air-fuel mixture. At the same time, in a gas turbine device configured to burn the air-fuel mixture to generate high-temperature combustion gas and supply the obtained combustion gas to the gas turbine to obtain power, the amount of air flowing into the compressor is reduced. An inlet guide vane that adjusts by changing the opening degree, a recirculation system that connects an outlet of the compressor and an air system of the compressor, and a recirculation valve interposed in the recirculation system. Is what you do.

In the air supply apparatus having the above-described structure, when the load is cut off, a part of the air in the compressor is returned to the air system of the compressor by opening the recirculation valve rapidly. As a result, the amount of air supply to the combustor can be reduced,
It is possible to maintain the minimum fuel-air ratio for maintaining the flame.

Further, the invention according to claim 6 is provided with a control device for controlling the recirculation valve, wherein the control device outputs a signal for rapidly opening the recirculation valve when a load shedding signal is given, and the set time elapses. It is characterized by having a timer for cutting off the output later.

In the air supply device having the above-mentioned structure, when the load is cut off, a part of the air in the compressor is returned to the air system of the compressor by rapidly opening the recirculation valve. As a result, the amount of air supply to the combustor can be reduced,
It is possible to maintain the minimum fuel-air ratio for maintaining the flame.

The invention according to claim 7 is provided with a control device for controlling the inlet guide vane and the recirculation valve, and the control device controls the inlet guide based on a deviation between the detected exhaust gas temperature signal of the gas turbine and the set value. A controller for generating a control signal for adjusting the opening of the blade, a timer for outputting a switching signal and a signal for rapidly opening the recirculation valve when a load shedding signal is given, and for turning off the output after a lapse of a set time; A signal switch for outputting a set value for setting the opening of the inlet guide vane to a specified opening sufficiently smaller than the maximum opening during the input of the switching signal; and one of an output signal of the switch and a control signal of the controller. And a low value selection circuit for selecting and outputting a low value.

In the air supply device having the above-described structure, when load interruption occurs, the amount of air flowing into the compressor is reduced by the rapid closing of the inlet guide vanes, and the recirculation valve is simultaneously opened by the rapid opening of the recirculation valve. A part of the air returns to the air system of the compressor. As a result, the amount of air supply to the combustor can be greatly reduced in both cases, and the minimum fuel-air ratio can be more reliably maintained.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the inlet guide vane 26 includes a control device 1 for controlling the opening degree thereof. The control device 1 includes a load shedding detector 2, a single shot generator 3, a timer 4, an analog signal switch 5, and a low value selection circuit 6. The load shedding detector 2 detects occurrence of load shedding such as a power system accident. This detection can be detected by an open circuit of the generator breaker, or a power load unbalance circuit that detects an imbalance between the calorific value of the gas turbine and the power generation output. Single shot generator 3
Converts the detection signal from the load shedding generator 1 into a one-pulse signal and outputs it. Further, the timer 4 issues a switching signal when an input signal is given, and cuts off its output when a predetermined set time has elapsed. The switching signal of the timer 4 is input to the analog signal switch 5.

The analog signal switch 5 receives a set value corresponding to the specified opening degree α% of the inlet guide vane and the maximum opening degree MAX% of the inlet guide vane. Outputs the set value for the specified blade opening α%, and when this input is cut off, the maximum guide opening M
The set value to be set to AX% is output. The output signal of the analog signal switch 5 is input to the low value selection circuit 6. The low value selection circuit 6 receives the control signal supplied from the adjuster 39, and selects and outputs one of the low value of the signal from the analog signal switch 5 and the signal from the adjuster 39. This output signal controls the opening degree of the inlet guide vane 26 via the guide vane drive means 37.

The present embodiment has the above-described configuration. When load shedding occurs, the load shedding detector 2 detects the load shedding.
The detection signal is input to the single shot generator 3, and the one-pulse signal is input to the timer 4. With this one pulse signal, the timer 4 sends a signal to the analog signal switch 5 to switch the opening degree of the inlet guide blade 26 after the load is cut off to, for example, a specified opening degree α% sufficiently smaller than the maximum opening degree MAX%. Is output.

The output of the analog signal switch 5 is input to the low value selection circuit 6 and compared with the control signal input from the adjuster 39, and the low value is selected and output to the guide wing driving means 37. You. The set value of the prescribed opening α% of the inlet guide vane is smaller than the control signal from the controller 39 based on the still high exhaust gas temperature signal detected by the temperature detector 36. The specified blade opening α% is selected. As a result, the inlet guide vanes 26 immediately close to the prescribed opening degree, and the amount of air flowing into the compressor 21 is greatly reduced as compared with the amount of air immediately before the load is cut off. The amount is reduced.

FIG. 2A shows a change in the opening degree of the inlet guide vane 26 together with a change in the opening degree of the other fuel control valve 28, the premixed fuel control valve 30, and the diffusion fuel control valve 32. FIG. 2B shows the transition of the air and fuel amounts at this time. As can be seen from the curve D, the opening degree of the inlet guide vane 26 starts closing at the same time as the load shedding, and the air supply amount sharply decreases at the same time as the load shedding as shown by the curve G.

Thereafter, when a few seconds elapse after load interruption occurs, the output of the timer 4 is cut off and the analog signal switch 5 is switched to the inlet guide blade maximum opening degree MAX% side. The control signal from the controller 39 is selected in the circuit 6, but several seconds have elapsed after the load shedding, and the exhaust gas temperature also decreases accordingly, and the control from the controller 39 based on the exhaust gas temperature signal is performed. Since the signal also decreases, the opening guide blade 26 has a value corresponding to the inlet guide blade specified opening α% used for opening control immediately after the load is cut off, and the opening of the inlet guide blade 26 does not change.

As described above, according to the present embodiment, the amount of air flowing into the compressor 21 decreases due to the rapid closing of the inlet guide vanes 26 simultaneously with the occurrence of load interruption. As a result, the amount of air supply to the combustor 23 can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained. Thus, misfire of the combustor 23 can be prevented.

Next, another embodiment of the present invention will be described. In FIG. 3, the exhaust gas system 3
4, a bypass system 7 is connected. An exhaust valve 8 is interposed in the path of the bypass system 7. The exhaust valve 8 is controlled by a control unit 9 comprising the following means for controlling the exhaust valve:
It has. That is, the load shedding detector 2 detects load shedding using the same circuit breaker of the generator circuit breaker and the power load unbalance circuit as in the above embodiment. The single shot generator 3 converts the applied load shedding detection signal into a one-pulse signal and outputs it. The timer 4 issues an output signal to the exhaust valve 8 when an input signal is given, and turns off the output signal when a set time has elapsed.

The present embodiment has the above-mentioned configuration. When load shedding occurs, the load shedding detector 2 detects this.
The detection signal is input to the single shot generator 3, and the one-pulse signal is input to the timer 4. The one pulse signal causes the timer 4 to output a control signal to the exhaust valve 8 to set the valve body to the fully open position. When the exhaust valve 8 is fully opened, a part of the air in the compressor 21 passes through the bypass system 7 and is connected to the exhaust side of the gas turbine 22.
4 and the amount of air supplied to the combustor 23 decreases. Thereafter, when several seconds elapse after load interruption occurs, the output of the timer 4 is cut off, and the exhaust valve 8 is fully closed.

As described above, according to the present embodiment, the exhaust valve 8 is rapidly opened at the same time as the load interruption, so that a part of the air in the compressor 21
Flow out to 4. As a result, the amount of air supply to the combustor 23 can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained. Thus, misfire of the combustor 23 can be prevented.

Next, another embodiment of the present invention will be described. 4, the air supply device includes a bypass system 7 and an exhaust valve 8 similar to those of the above-described embodiment (see FIG. 3). Further, the inlet guide vanes 26 and the exhaust valve 8 are provided with a control device 10 comprising the following means for controlling them. That is, the load shedding detector 2 detects load shedding of the gas turbine device. The single shot generator 3 converts the applied load shedding detection signal into a one-pulse signal and outputs the pulse signal. The timer 4 outputs an output signal to the exhaust valve 8 when an input signal is applied, and when a set time has elapsed. Cut its output to

The output of the timer 4 is input to the signal switch 5 as a switching signal. The signal switching unit 5 inputs a set value corresponding to the inlet guide vane prescribed opening α% and the inlet guide vane maximum opening MAX%. The set value to be set to α% is output, and when this input is cut off, the set value to be set to the inlet guide blade maximum opening degree MAX% is output. The output signal of the analog signal switch 5 is input to the low value selection circuit 6. Further, the low value selection circuit 6 receives a control signal from the control valve 39 and selects and outputs a low value of either the signal from the analog signal switch 5 or the signal from the controller 39. This output signal is supplied to the guide wing driving means 37.
The opening degree of the inlet guide vane 26 is controlled via the.

The present embodiment has the above-described configuration. When load shedding occurs, the load shedding detector 2 detects the load shedding.
The detection signal is input to the single shot generator 3, and the one-pulse signal is input to the timer 4. The one pulse signal causes the timer 4 to output a control signal to the exhaust valve 8 to set the valve body to the fully open position. When the exhaust valve 8 is fully opened, a part of the air in the compressor 21 flows through the bypass system 7 to the low-pressure exhaust gas system 34, and the amount of air flowing into the combustor 23 decreases.

Simultaneously, the timer guide 4 keeps the opening of the inlet guide vanes 26 after the load is cut off from the timer 4 to the analog signal switch 5 by one pulse signal smaller than the opening before the load cuts. A signal for switching to α% is output. The output of the analog signal switch 5 is input to the low value selection circuit 6 and compared with the control signal from the controller 39, and the low value is selected and output to the guide wing driving means 37. The set value of the inlet guide vane prescribed opening α% is smaller than the control signal from the controller 39, and when both signals are compared, the inlet guide vane prescribed opening α% is selected. As a result, the inlet guide wing 26 immediately closes to the specified opening degree,
The amount of air flowing into the compressor 21 is greatly reduced as compared with the amount of air immediately before the load is cut off. As a result, the amount of air flowing into the combustor 23 is reduced.

Thereafter, when several seconds elapse after the load interruption occurs, the output of the timer 4 is cut off, and the exhaust valve 8 is fully closed.
At the same time, the analog signal switch 5 switches to the inlet guide blade maximum opening degree MAX%.

As described above, according to this embodiment, the amount of air flowing into the compressor 21 decreases due to the rapid closing of the inlet guide vanes 26 simultaneously with the occurrence of load interruption, and at the same time, the exhaust valve 8 By opening, a part of the air in the compressor 21 flows out to the exhaust gas system 34 of the gas turbine 22. As a result, the amount of air supply to the combustor 23 can be greatly reduced in both cases, and the minimum fuel-air ratio can be more reliably maintained.

Further, another embodiment of the present invention will be described. In FIG. 5, the air system 25
The recirculation system 11 is connected to. A recirculation valve 12 is interposed in the path of the recirculation system 11. The recirculation valve 12 includes the same control device 9 as in the above embodiment (see FIG. 3).

The present embodiment has the above-described configuration. When load shedding occurs, the load shedding detector 2 detects this.
The detection signal is input to the single shot generator 3, and the one-pulse signal is input to the timer 4. The one pulse signal causes the timer 4 to output a control signal to the recirculation valve 12 to set the valve body to the fully open position. When the recirculation valve 12 is fully opened, a part of the air in the compressor 21 returns to the air system 25 connected to the inlet of the compressor 21 through the recirculation system 11 and the amount of air flowing into the combustor 23 decreases. . Thereafter, when a few seconds elapse after load interruption occurs, the output of the timer 4 is cut off, so that the recirculation valve 12 is fully closed.

As described above, also in the present embodiment, the recirculation valve 12 is rapidly opened at the same time when the load is cut off, so that a part of the air in the compressor 21 is
Reflux. As a result, the amount of air supply to the combustor 23 can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained. Thus, misfire of the combustor 23 can be prevented.

Next, another embodiment of the present invention will be described. 6, the air supply device includes a recirculation system 11 and a recirculation valve 12 similar to those of the above-described embodiment (see FIG. 5). In addition, the inlet guide vanes 26 and the recirculation valve 12
Has a control device 10 similar to that of the above embodiment (see FIG. 4).

In this embodiment, the recirculation valve 12 is suddenly opened by the operation of the single shot generator 3 and the timer 4 when the load shedding is detected. Part of the air in 21 is air system 2
Reflux to 5. In addition, the operation of the single shot generator 3, the timer 4, and the low value selection circuit 6 similar to those of the above-described embodiment causes the inlet guide vanes 26 to close suddenly, thereby reducing the amount of air flowing into the compressor 21. Therefore, the amount of air flowing to the combustor 23 immediately after the load is cut off can be greatly reduced.

As described above, also in the present embodiment, the amount of air flowing into the compressor 21 decreases due to the sudden closing of the inlet guide vanes 26 simultaneously with the occurrence of load interruption, and the recirculation valve 12 opens at the same time. As a result, a part of the air in the compressor 21 returns to the air system 25 of the compressor 21. As a result, the amount of air supply to the combustor 23 can be greatly reduced in both cases, and the minimum fuel-air ratio can be more reliably maintained.

[0052]

As described above, according to the present invention, when a load is cut off, the inlet guide vanes are suddenly closed, the exhaust valve is rapidly opened, or the recirculation valve is rapidly opened, so that the compressor is opened. The amount of air flowing into the air decreases. As a result, the amount of air supplied to the combustor can be reduced, and the minimum fuel-air ratio for maintaining the flame can be maintained.

Therefore, according to the present invention, misfire of the combustor can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an air supply device for a gas turbine device according to the present invention.

FIG. 2A is a characteristic diagram showing a change in the opening degree of each fuel control valve and an inlet guide vane when load shedding occurs according to the present invention.
(B) is a characteristic diagram showing changes in fuel and air amounts.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a system diagram showing a conventional fuel supply device and an air supply device.

FIG. 8 is a block diagram showing a control device of a conventional air supply device.

FIG. 9 is a characteristic diagram showing a change in the opening degree of each fuel control valve during fuel transfer.

FIG. 10A is a characteristic diagram showing a change in the opening degree of each fuel control valve and the inlet guide vane when a conventional load shedding occurs. (B)
7 is a characteristic diagram showing changes in fuel and air amounts.

[Explanation of symbols]

 2 Load Shedding Detector 4 Timer 5 Analog Signal Switch 6 Low Value Selection Circuit 8 Exhaust Valve 12 Recirculation Valve 21 Compressor 22 Gas Turbine 23 Combustor 26 Inlet Guide Blade

Claims (7)

[Claims] 1. Air is guided to a compressor to generate high-pressure combustion air, and the obtained high-pressure air is guided to a combustor to be mixed with fuel to generate an air-fuel mixture and burn the air-fuel mixture. In the gas turbine device configured to generate high-temperature combustion gas and supply the obtained combustion gas to the gas turbine to obtain power, the opening amount of the air flowing into the compressor is changed by changing the opening degree. And a control device for controlling the opening degree of the inlet guide vane, wherein the control device detects the entrance guide based on a deviation between a gas turbine exhaust gas temperature signal detected and a set value. A controller for producing a control signal for adjusting the opening of the blade, a timer for outputting a switching signal when a load shedding signal is given, and cutting off the output after a lapse of a set time; The maximum opening of the wing A signal switch for outputting a set value for setting the opening to a sufficiently small value, and a low value selection circuit for selecting and outputting a low value of an output signal of the signal switch and a control signal of the controller. An air supply device for a gas turbine device, comprising: 2. Air is guided to a compressor to generate high-pressure combustion air, and the obtained high-pressure air is guided to a combustor to be mixed with fuel to generate an air-fuel mixture and burn the air-fuel mixture. In the gas turbine device configured to generate high-temperature combustion gas and supply the obtained combustion gas to the gas turbine to obtain power, the opening amount of the air flowing into the compressor is changed by changing the opening degree. An air guide for a gas turbine device, comprising: an inlet guide vane for adjusting the pressure, a bypass system connecting an outlet of the compressor and an exhaust gas system of the gas turbine, and an exhaust valve interposed in the bypass system. Feeding device. 3. A control device for controlling the exhaust valve,
3. The gas turbine device according to claim 2, further comprising a timer that outputs a signal for rapidly opening the exhaust valve when the control device receives a load shedding signal, and turns off the output after a set time has elapsed. Air supply device. 4. A control device for controlling the inlet guide vanes and the exhaust valve, wherein the control device controls the inlet guide vanes based on a deviation between a detected exhaust gas temperature signal of the gas turbine and a set value. A controller for generating a control signal for adjusting the opening degree, a timer for outputting a switching signal and a signal for rapidly opening the exhaust valve when a load shedding signal is given, and switching off the output after a lapse of a set time; During the input of the signal, a signal switch that outputs a set value that sets the opening of the inlet guide vane to a specified opening that is sufficiently smaller than the maximum opening,
3. The air supply device for a gas turbine device according to claim 2, further comprising: a low value selection circuit that selects and outputs a low value of any of an output signal of the signal switch and a control signal of the regulator. . 5. A high-pressure combustion air is generated by introducing air to a compressor, and the obtained high-pressure air is guided to a combustor, and is mixed with fuel to generate an air-fuel mixture. In the gas turbine device configured to generate high-temperature combustion gas and supply the obtained combustion gas to the gas turbine to obtain power, the opening amount of the air flowing into the compressor is changed by changing the opening degree. A gas turbine, comprising: an inlet guide vane for adjusting the pressure, a recirculation system connecting an outlet of the compressor and an air system of the compressor, and a recirculation valve interposed in the recirculation system. Equipment air supply. 6. A control device for controlling the recirculation valve, wherein the control device outputs a signal for rapidly opening the recirculation valve when a load shedding signal is given, and outputs the output after a lapse of a set time. The air supply device for a gas turbine device according to claim 5, further comprising a timer for turning off the air. 7. A control device for controlling the inlet guide vanes and the recirculation valve, wherein the control device controls the inlet guide vanes based on a deviation between a detected exhaust gas temperature signal of the gas turbine and a set value. A regulator for generating a control signal for adjusting the opening degree, a timer for outputting a switching signal and a signal for rapidly opening the recirculation valve when a load shedding signal is given, and switching off the output after a lapse of a set time; During the signal input, a signal switch that outputs a set value that sets the opening of the inlet guide vane to a specified opening that is sufficiently smaller than the maximum opening, and any one of an output signal of the switch and a control signal of the regulator. The air supply device for a gas turbine device according to claim 5, further comprising a low value selection circuit that selects and outputs the low value.