JPH039032A - Fuel feeding control device for gas turbine - Google Patents

Abstract

PURPOSE:To secure the constant and stable operation by compensating the secondary set pressure signal corresponding to the engine speed of a gas turbine using the fuel at the standard calorific value with the calorific value compensating signal against the fuel at the standard calorific value selected among the multiple fuel. CONSTITUTION:A selection circuit 30 for selectively switching the fuel to be fed to a combustor 13, for example the LNG fuel at the standard calorific value, the LNG fuel at the high calorific value and the LNG fuel at the low calorific value, is provided. The output of each terminal 31-33 corresponding to the each fuel is sent to an adding unit 33 directly or thorugh compensation function generating units 45, 46 to be compensated with the secondary set pressure signal of the fuel at the standard calorific value which can obtain the predetermined fuel pressure corresponding to the predetermined engine speed of a gas turbine 11 using the furl at the standard fuel calorific value. A stop valve 17 is controlled with the set pressure signal after the compensation at the control signal. In the case that the LNG fuel at the different calorific value is used, the secondary set pressure signal of a set pressure signal generating unit 40 is compensated in the same way to control a stop valve 21 with the signal after the compensation.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a fuel supply control device for a gas turbine, and particularly to a gas turbine fuel supply control device that switches between fuels with different calorific values. The present invention relates to a fuel supply control device.

(Prior art) Generally, fuels such as diesel oil and kerosene are used as fuel for gas turbines, but recently, from the perspective of diversifying energy resources, liquefied natural gas (hereinafter referred to as LNG) has been used as fuel for gas turbines.
Alternatively, liquefied propane gas (hereinafter referred to as LPG) has been used.

In response to the diversification of fuels, there are various types of fuel operation modes for gas bottles, such as those for burning only liquid fuel, those for mixed combustion of liquid fuel and gas fuel, and those for burning only gas fuel.

In particular, the number of dedicated gas turbines has been increasing in recent years, reflecting advances in gas transportation technology and energy consumption plans that increase the proportion of gas fuel.

Furthermore, in gas turbine power generation plants, gaseous fuels having different calorific values are used to stably operate the power generation plants. Typical examples include those using LNG fuel, LPG fuel, or a mixture of these fuels.

Hereinafter, a gas turbine power generation system configured with two types of gas fuel systems, LNG fuel and LPG fuel, which have been commonly used in the past, will be explained with reference to FIG.

In the figure, a compressor 10, a gas turbine 11, and a generator 12 are coaxially connected. The air compressed by the compressor 10 is sent to the combustor 13, where the compressed air and fuel are combusted, and the compressed combustion gas causes the gas turbine 11 to rotate at a predetermined speed.

There are two types of fuel systems for the fuel supplied to the combustor 13: an LNG fuel supply system 14 and an LPG fuel supply system 15. One end of this LNG fuel supply system 14 is connected to an LNG fuel supply source (not shown), and the other end is connected to the combustor 13.
A conduit 16 connected to is provided. This conduit 16
A stop valve 17 for controlling the emergency cutoff of LNG fuel and the fuel supply pressure, and a control valve 18 for controlling the supply amount are provided. The combustor 13 is provided with a nozzle 19a that atomizes the LNG fuel sent from the control valve 18, and the air compressed by the compressor 10 and the LNG fuel are mixed, and this mixed fuel is It is combusted in a combustor 13.

In addition, the LPG fuel supply system 15 is also the LNG fuel supply system 1.
It is configured in the same way as 4. That is, one end is connected to an LPG fuel supply source (not shown), and the other end is connected to the combustor 13.
A conduit 20 connected to is provided. This conduit 20
is provided with a stop valve 21 that controls emergency shutoff of LPG fuel and the fuel supply pressure, and a control valve 22 that controls the supply amount. In addition, the combustor 13 is provided with a nozzle 19b that supplies LNG fuel in the form of a spray, and the air compressed by the compressor 10 and the LNG fuel are mixed.
This mixed fuel is burned in the combustor 13.

In addition, in the figure, a purge line 24 having an on-off valve 23a is provided between the outlet side 10a of the compressor 10 and the outlet side of the control valve 18.
a is a purge line 24b having an on-off valve 23b between the outlet side 10b of the compressor 10 and the outlet side of the control valve 22;
is provided so that fuel remaining in the pipe line 16 or pipe line 20 is discharged from the unused LNG fuel supply system 14 or LPG fuel supply system 15 to the combustor 13.

In addition, the gas turbine 11 is equipped with an exhaust heat recovery boiler, a combine cycle (none of which is shown), etc.
Since it is not directly related to the present invention, detailed explanation will be omitted.

The stop valve 17 of the LNG fuel supply system 14 has a secondary setting to obtain a secondary side LNG fuel setting pressure Pa corresponding to a predetermined rotation speed Na of the gas turbine 11 for LNG fuel with a standard calorific value. A set pressure signal generator 25 is connected which generates a pressure signal, and the set pressure signal controls the emergency shutoff of the stop valve 17 and its fuel supply pressure.

Further, a control valve setting signal generation circuit 26 for fuel having a standard calorific value is connected to the control valve 18 . A control signal generation circuit 27 is connected to the control valve setting signal generation circuit 26.
From this control signal generation circuit 27, an operation command fal and a minimum operation command f corresponding to the rotational speed and load of the gas turbine 11 are sent.
a2. Command signals fa such as ignition command fa3, warm-up command, etc.
will be sent. The control valve setting signal generation circuit 26 generates the command signal f
When receiving the signal a, etc., the control valve setting signal generating circuit 26 sets the control valve 18 for the standard calorific value fuel to supply the appropriate amount of LNG fuel to the combustor 13 for the standard calorific value LNG fuel. A setting signal is generated, and the control valve 18 is controlled by this control valve setting signal to control the amount of fuel supplied to the combustor 13.

In this way, the stop valve 17 and the control valve 18 are properly controlled by the set pressure signal of the set pressure signal generator 25 and the control valve setting signal of the control valve setting signal generation circuit 26, and the gas turbine 1] Extensive LNG fuel control is performed. For example, even if the control valve 18 is slightly controlled in the low flow rate region during low speed operation of the gas turbine 1, stable flow control is achieved because the LNG fuel control is initially maintained at a low pressure by the valve 17. will be held.

Further, L is also connected to the stop valve 21 of the LPG fuel supply system 15.
Similarly to the NG fuel supply system 14, a set pressure signal generator 28 is provided which generates a set pressure signal designed to obtain an LPG fuel set pressure pb on the secondary side corresponding to a predetermined rotation speed Nb of the gas turbine 11. , emergency shutoff of the stop valve 21 and control of the fuel supply pressure are performed.

Further, a control valve setting signal generation circuit 29 for fuel having a standard calorific value is connected to the control valve 22 . The control signal generation circuit 27 is connected to the control valve setting signal generation circuit 29, and the control signal generation circuit 27 generates an operation command fbl and a minimum operation command f corresponding to the rotational speed and load of the gas turbine 11.
b22 Ignition command fb3, command signal fb such as warm-up command
will be sent. When this control valve setting signal generating circuit 29 receives a command signal fb etc., this control valve setting signal generating circuit 29
A control valve setting signal for the control valve 22 is generated so as to supply an appropriate amount of LPG fuel to the combustor 13 for LPG fuel having a standard calorific value, and the control valve 22 is controlled by this control valve setting signal. An appropriate amount of LPG fuel is supplied to the combustor 13.

LNG is used to start up a gas turbine generator with these configurations.
The case of operation using fuel will be explained.

First, the gas turbine 11 is rotated by a starter device (not shown) such as a torque converter and a motor provided coaxially with the gas turbine 1.

When this gas turbine 11 starts rotating, the stop valve 1
7 is opened, and the fuel pressure of the LNG fuel supplied to the combustor 13 is controlled in accordance with the rotation of the gas turbine 11, and the supply flow rate is controlled by the control valve 18.

This controlled LNG fuel is delivered to the nozzle 1 through a pipe 16.
LNG fuel is atomized by this nozzle 19a and sent to the combustor 13.

Further, the rotation of the gas turbine 11 rotates the compressor 10, and the compressed air is sent to the combustor]3. Combustor 1
3, the atomized gas of the LNG fuel and compressed air are mixed, this mixed fuel is combusted in the combustor 13, and the gas turbine 11 is warmed up for a certain period of time.

After performing a predetermined warm-up operation, the rotational speed of the gas turbine 11 is increased to the rated rotational speed, and during this period, the above-mentioned L
The amount of NG fuel and compressed air is increased sequentially to reach the rated speed of the rated load.

By controlling the stop valve 17 and the control valve 18, the combustor 13 is powered by the gas turbine 11 using fuel with a standard calorific value.
The optimum flow rate at the optimum pressure corresponding to the low load state to the high load state is supplied, and the gas turbine 11 can be operated appropriately.

These controls are the same when LPG fuel and other fuels are used.

(Problem to be solved by the invention) In the operation of a gas turbine, stop valves and regulating valves are
It is controlled by a standard calorific value fuel set pressure signal generator, a set pressure signal generated from a control valve setting signal generation circuit, a control valve setting signal, etc., and the fuel pressure and fuel supply flow rate supplied to the gas turbine are controlled. Ru. However, as fuels have become more diversified in recent years, the combustion characteristics of the fuels vary considerably depending on the type, place of production, and time of collection, making it difficult to operate gas turbines appropriately. For example, L.P.
In G fuel, there is a difference in calorific value of several times or more between when the main component is propane and when the main component is butane.
This difference in calorific value causes the following problems. That is, when igniting, it may become impossible to ignite if a fuel with a lower calorific value is used than a fuel with a standard calorific value. Furthermore, if fuel with a high calorific value is used, more fuel than necessary will be injected into the gas turbine, resulting in a problem that the exhaust gas temperature will rise above the specified value.

1 2 In addition, when a gas with a low calorific value is used during a load cutoff, etc., the control valve is throttled, so not enough fuel flows to maintain the necessary calorific value, and combustion may blow out. There is.

Furthermore, when gas fuel with a high calorific value is used, there is a problem in that even if the control valve is set to the minimum opening degree, more fuel than necessary is injected, causing the gas turbine to overspeed.

Furthermore, when disconnecting the generator from the grid, the control valve is throttled to the minimum valve opening, but if gas fuel with a high calorific value is used, the calorific value of the gas fuel input to the gas turbine is too high. However, there is a problem in that the load cannot be reduced to the level required to operate a reverse power relay that disconnects from the power transmission system.

Another problem is that the different amounts of fuel delivered to the combustor can cause fuel clogging in the combustor, nozzle, and piping system over time. This clogging of the combustor etc. has caused problems such as failure of ignition of the combustor and blow-out of combustion due to the minimum opening degree of the control valve at the time of load cutoff.

SUMMARY OF THE INVENTION In order to solve these problems, it is an object of the present invention to provide a fuel supply control device for a gas turbine that allows stable operation of the gas turbine even when fuels with different calorific values are used.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides for selectively supplying fuels with different calorific values through a stop valve that performs emergency shutoff of fuel and controls fuel supply pressure, and a control valve that controls fuel supply amount. A fuel supply control device for a gas turbine configured to include a selection circuit that generates a control signal corresponding to a selected fuel, and a selection circuit that is activated by the control signal of the selection circuit to control the selection of the selected fuel for a fuel with a standard calorific value. A correction function generator that generates a calorific value correction signal, a set pressure signal generator that generates a secondary set pressure signal corresponding to the rotational speed of the gas turbine when using fuel with a standard calorific value, and settings of the set pressure signal generator. An adder is provided which corrects the pressure signal ' with the correction signal from the correction function generator and controls the stop valve with the corrected control signal.

Further, in the gas turbine fuel supply control device,
a selection circuit that generates a control signal corresponding to the selected fuel; a correction function generator that is activated by the control signal of the selection circuit and generates a calorific value correction signal for the selected fuel relative to a standard calorific value fuel; A control valve setting signal generation circuit that generates a control valve setting signal corresponding to a gas turbine control signal for fuel with a standard calorific value, and a control valve setting signal of the control valve setting signal generation circuit that is used as a correction signal of the correction function generator. and an adder for controlling the control valve using the corrected control signal.

Furthermore, the calorific value correction signal of the correction function generator is corrected and controlled using a deviation signal between the initial ignition failure signal and the latest ignition failure signal.

Furthermore, in the fuel supply system of the gas turbine, a gas analyzer is provided close to the combustor and analyzes combustion gas during combustion, and a calorific value analysis signal calculated from the gas analysis signal of the gas analyzer is generated. a calorific value analysis calculation circuit that generates a standard calorific value signal, a standard gas function device that generates a standard calorific value signal, and a first correction signal that corrects the standard calorific value signal of the standard gas function device by the calorific value analysis signal of the calorific value analysis calculation circuit. a first adder that generates a second adder, and a second set pressure signal corresponding to the rotational speed of the gas turbine when using fuel with a standard calorific value, or a control valve setting signal corresponding to the rotational speed of the gas turbine when using fuel with a standard calorific value. a setting circuit that generates setting signals such as;
A second adder that corrects the setting signal of the setting circuit with the first correction signal of the first adder and controls the stop valve or the control valve with the corrected second correction signal. It was established.

(Function) One of the fuels with different calorific values is selected by operating the selector. By selecting this selector, a correction signal is obtained in which the calorific value is corrected for the fuel having the standard calorific value of the different fuel. Further, a secondary set pressure internal number corresponding to the rotational speed of the gas turbine with fuel having a standard calorific value is extracted. This secondary set pressure limit is corrected by the correction signal, and the corrected control signal corrects the supply pressure of fuel with a different calorific value in accordance with the supply pressure of fuel with a reference calorific value, and the gas turbine Even when a fuel is operated with a fuel with a different calorific value, it is operated with the same calorific value as when it is operated with a fuel with a standard calorific value.

Also, a control valve setting signal corresponding to the gas turbine control signal is taken out. This control valve setting signal is corrected by a correction signal in which the calorific value of fuel with a different calorific value is corrected for the fuel with a standard calorific value, and the supplied amount of fuel with a different calorific value is adjusted by the corrected control signal to the fuel with a standard calorific value. The flow rate is corrected in accordance with the supplied amount of gas, and even when the gas turbine is operated with a fuel with a different calorific value, it is operated with the same calorific value as when it is operated with fuel with a standard calorific value.

In addition, the correction signal is corrected by the deviation signal between the initial ignition failure signal and the latest ignition failure signal, and even if the combustor etc. changes over time due to clogging etc., the supply pressure or supply amount of fuel with different calorific value is corrected. Ru.

Furthermore, the combustion gas of the combustor is analyzed by a gas analyzer, and this gas analysis signal is calculated to obtain a calorific value analysis signal. This calorific value analysis signal corrects the standard calorific value signal, the corrected control signal further corrects the setting signal, and the corrected setting signal controls the stop valve or the control valve. Through this control, fuels with different calorific values are supplied to the gas turbine in a manner that corresponds to the calorific value of fuel with a standard calorific value.

(Embodiment) Hereinafter, an embodiment of the fuel supply control device for a gas turbine according to the present invention will be described with reference to the accompanying drawings. In these drawings, the same parts as those of the conventional fuel supply control system for a gas turbine shown in FIG. 5 will be described using the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numeral 30 denotes fuel to be supplied to the combustor 13;
For example, it is a selection circuit that selectively switches between standard calorific value LNG fuel, high calorific value LNG fuel, and low calorific value LNG fuel. This selection circuit 30 is provided with terminals 31, 32, and 33, and when switching between the fuels from these terminals 31, 32, and 33, a standard heat generation signal, a high heat generation signal, and a low heat generation signal corresponding to each LNG fuel are used. A signal is taken. When this selection circuit 30 selects a fuel with a standard calorific value, a standard calorific value signal is sent to the adder 34, and when a fuel with a high calorific value is selected, a high calorific value signal is sent to the correction function generator 35, and a low calorific value signal is sent to the adder 34. When the fuel is selected, a low heat generation signal is sent to the correction function generator 36.

The correction function generator 35 calculates the difference in calorific value between when LNG fuel with a standard calorific value is combusted in the combustor 13 and when LNG fuel with a high calorific value is combusted in the combustor 3, In order to correspond to LNG fuel, a calorific value correction signal of high heat generation 1LNG fuel, for example, a negative correction signal is obtained.

Similarly to the correction function generator 35, the correction function generator 36 calculates the difference in calorific value between LNG fuel with a standard calorific value and LNG fuel with a low calorific value, and supplies LNG fuel with a standard calorific value. The system is designed to obtain a calorific value correction signal of low calorific value LNG fuel, for example, a positive correction signal.

When the correction function generator 35 receives the high heat generation signal, the correction function generator 35 sends a correction signal for correcting the amount of heat generation to the adder 34. When the correction function generator 36 receives the low heat generation signal, the correction function generator 36 sends a correction signal for correcting the amount of heat generation to the adder 34 .

A set pressure signal generator 37 is connected to this adder 34 . This set pressure signal generator 37 generates a predetermined rotational speed N of the gas turbine 11 using LNG fuel having a standard calorific value.
A secondary set pressure value number for fuel having a standard calorific value to obtain a predetermined fuel pressure Pa corresponding to a is generated.

These standard heat generation signals and correction heat generation signals are selected by the selection circuit 3.
are sent separately to the adder 34 in response to the selection of 0, and
The secondary set pressure value number of the set pressure signal generator 37 is also added to the adder 3.
4, and the secondary set pressure value number is corrected by a correction signal from a correction function generator 36 or the like. The control signal corrected by the adder 34 is sent to the stop valve 17, which controls the stop valve 17 so that LNG fuel with a different calorific value supplied to the combustor 13 corresponds to LNG fuel with a standard calorific value. The fuel pressure is corrected so that

Also, when using LPG fuel with different calorific value, L
Similarly to NG fuel, the secondary set pressure value number of the set pressure signal generator 40 is corrected. That is, the code 41 indicates the combustor 13.
This is a selection circuit that selectively switches between fuel supplied to the engine, for example, LPG fuel with a standard calorific value, LPG fuel with a high calorific value, and LNG fuel with a low calorific value. This selection circuit 41 has a terminal 42.
．． 43 and 44 are provided, and a standard heat generation signal, a high heat generation signal, and a low heat generation signal which are switched corresponding to each fuel when switching the fuels are taken out from these terminals. The standard heat generation signal is sent to an adder 45, the high heat generation signal is sent to a correction function generator 46, and the low heat generation signal is sent to a correction function generator 47 in the same way as the high heat generation signal.

When the correction function generator 46 receives the high heat generation signal, a correction signal corresponding to the amount of heat generation is generated, and this correction signal is sent to the adder 45. Further, when the correction function generator 47 receives the low heat generation signal, a correction signal corresponding to the amount of heat generation is generated, and this correction signal is sent to the adder.

In this adder 45, the secondary set pressure value number of the set pressure signal generator 40 is corrected by the correction signal. The stop valve 21 is controlled by this corrected control signal in the same manner as in the case of LNG fuel, and the set pressure corresponding to LPG fuel having a standard calorific value for different LPG fuels is corrected. In addition, 26a in the figure.

26b is a control valve setting signal generation circuit.

In this way, when using multiple fuels with different calorific values such as high calorific value and low calorific value in addition to standard calorific value fuel, the high calorific value and low calorific value fuels become the standard calorific value fuel. The calorific value is corrected accordingly, and the secondary set pressure value of the set pressure signal generator etc. is corrected by this correction signal. The stop valve 17 is controlled by this corrected control signal, and the supply pressure of fuels with different calorific values is corrected in accordance with the supply pressure of fuel with standard calorific values, and the fuels with different calorific values are supplied with the standard fuel. It is controlled to correspond to the amount of heat generated. This pressure control allows the gas turbine to operate with the same calorific value as fuel with a standard calorific value even when the gas turbine is operated with fuel having a different calorific value.

FIG. 2 shows a control valve setting signal generation circuit 51a or 51b (control valve setting signal generation circuit 51a or 51b) for fuel with a standard calorific value, which controls the control valve 18 or 22 according to fuel with a different calorific value, as in FIG. ], b shows another embodiment for correcting the control valve setting signal (not shown). Since the control devices are the same, the control valve setting signal generation circuit 51a that controls the control valve 18 will be explained.

In FIG. 2, reference numeral 52a is a selection circuit for switching between fuels having different calorific values. A standard heat generation terminal 53a, a high heat generation terminal 54a, and a low heat generation terminal 55a are connected to this selection circuit 52a, and a standard heat generation signal, a high heat generation signal, and a low heat generation signal are taken out from these terminals in conjunction with switching of fuel. be done. When the terminal 53a is selected, the standard heat generation signal is sent to the adder 56a, and when the terminal 54a is selected, the high heat generation signal is sent to the correction function generator 57a.
When terminal 55a is selected, the low heat generation signal is sent to correction function generator 58a.

The correction function generator 57a calculates the difference in calorific value between when LNG fuel with a standard calorific value is combusted in the combustor 13 and when LNG fuel with a high calorific value is combusted in the combustor 13, and calculates the difference in calorific value when LNG fuel with a standard calorific value is combusted in the combustor 13. LNG with a high calorific value that can be used as fuel
This is to obtain a fuel calorific value correction signal, for example, a negative correction signal, and this correction signal is sent to the adder 56a.

The correction function generator 58a calculates the difference in calorific value between when LNG fuel with a standard calorific value is combusted in the combustor 13 and when LNG fuel with a low calorific value is combusted in the combustor 13. A calorific value correction signal for the low calorific value LNG fuel, for example, a positive correction signal, is obtained in correspondence with the fuel, and this correction signal is sent to the adder 56a.

A control signal generation circuit 27 for generating an operation command for the gas turbine 11 as shown in FIG. 1 is connected to the control valve setting signal generator 51a, and receives an operation command signal fa and the like. Upon receiving this command signal fa, etc., the control valve setting signal generator 51a outputs the specified calorific value L.
A control valve setting signal for the regulating valve 18 for NG fuel is generated.

The control valve setting signal from the control valve setting signal generator 51a is sent to an adder 56a, where it is corrected by a correction signal sent from the correction function generator 57a or the like. The control signal corrected by the adder 56a is sent to the control valve 18, and the control valve 18 is controlled so that the LNG fuel with the calorific value corrected for the different LNG fuel corresponding to the LNG fuel with the standard calorific value is delivered to the combustor. 13.

In this way, the control valve setting signal of the control valve setting signal generator 51a for the standard calorific value fuel is corrected by the correction signal of the correction function generator 57a, etc., and the regulating valve 18 is controlled by this corrected control signal. Fuels having different calorific values supplied to the combustor 13 are controlled in correspondence with fuel having a standard calorific value. Through this control, even when fuel with a different calorific value other than fuel with a standard calorific value is used, the corrected fuel with a different calorific value corresponding to the fuel with a standard calorific value is supplied to the combustor 13, and the gas turbine 11 is It is possible to operate with the same calorific value as when operating with fuel with a calorific value.

Note that the control valve setting signal generator 51b for LPG fuel
A control valve setting signal (not shown) is converted to a correction function generator 57b.
In the case of correction using the correction signal, the control valve opening degree signal of the control valve setting signal generator 51a can be controlled in the same way as the case of correction of the control valve opening degree signal of the correction function generator 57a. Figure 3 shows
Correction function generator 35.36 shown in FIGS. 1 and 2
This shows another embodiment in which the correction signal such as the above is corrected by a comparison signal between an initial ignition failure signal and a latest ignition failure signal.

That is, in FIG. 3, the reference numeral 60 indicates the gas turbine 1.
1 is an ignition failure calculation circuit that can calculate the ratio of the number of ignition failures of the combustor 13 and the like to the number of activations. An initial ignition failure recording circuit 61 for recording initial ignition failure calculation data of the gas turbine 11 is connected to this ignition failure calculation circuit 60, and the initial ignition failure state is recorded. Further, the latest ignition failure recording circuit 62 for recording the latest ignition failure calculation data of the gas turbine 11 is connected to the ignition failure calculation circuit 60,
The latest ignition failure status is recorded. The initial ignition failure recording circuit 61 receives its output signal from the latest ignition failure recording circuit 6.
A gain circuit 63 (ignition failure rate x α) is connected so as to correct the output signal to 2, and the output signal fi of this gain circuit 63 is sent to an arithmetic circuit 64. Further, the latest ignition failure recording circuit 62 outputs the output signal fd from the arithmetic circuit 6.
Sent to 4. In this calculation circuit 64, the output signal fi of the initial ignition failure and the output No. 16 fd of the latest ignition failure are compared and calculated, and when the output signal fd of the latest ignition failure is larger than the output signal fi of the initial ignition failure, A deviation signal is generated and sent to gain circuit 65. This deviation signal is amplified by a gain circuit 65, and its output signal is sent to a correction function generator 66. This correction function generator 66 is the correction function generator 3 explained in FIGS. 1 and 2.
7 etc., a correction signal for correcting the calorific value is generated, and this correction signal is corrected for ignition by the deviation signal and sent to the adder 67. This ignition correction signal corrects a setting signal such as a set pressure signal generated from the set pressure signal generator 68 or a control valve setting signal generated from the control valve setting signal generation circuit 51a (not shown).

The control signal corrected by the adder 67 is sent to the stop valve 17 or the control valve 18 as described above, and the supply pressure or supply flow rate of fuel is controlled.

In this way, the correction signal of the correction function generator 66 is corrected by the deviation signal between the latest ignition failure signal fd and the initial ignition failure signal fi, and the setting signal of the setting pressure signal generator 68 etc. is corrected by this correction signal. Therefore, the corrected control signal becomes a correction signal that takes into account the ignition failure rate.

Moreover, since the deviation signal between the latest ignition failure signal fd and the initial ignition failure signal fi is the ratio of ignition failure, the initial ignition state, that is, the combustion conditions of the first combustor 13, nozzle 19a, etc., and the latest ignition state, that is, the current use Combustor 13 inside
, represents the difference in combustion conditions of the nozzle 19a, etc.
If this deviation signal is small, there will be little aging change such as clogging or damage to the combustor 13 and nozzle 19a, and if it is large, the combustor 13
This means that the nozzle 19a has become more susceptible to aging such as clogging and damage.

In such a case, the correction signal of the correction function generator 66 is corrected by this large deviation output signal, that is, the deviation signal when the latest ignition failure signal fd>the initial ignition failure signal fi, so that clogging of the combustor 13 and nozzle 19a is corrected. , when there is a change over time such as damage, the correction output is increased and the pressure or flow rate of fuel supplied to the combustor 13 is increased. Therefore,
Even if the combustor 13, nozzle 19a, etc. change over time, the combustor 13, etc. will not cause ignition failure and can always be used safely.

FIG. 4 shows another embodiment different from the embodiments shown in FIGS. 1, 2, and 3.

That is, the set pressure signal generator 37 (40, 68...
) is corrected from the gas analysis data obtained by analyzing the fuel gas being combusted. It is something. That is,
A gas analyzer 70 is provided close to the combustor 13 to analyze the fuel gas being combusted. This gas analyzer 70 analyzes the fuel gas for each gas such as methane, ethane, etc.
is analyzed. The gas analysis signal from the gas analyzer 70 is sent to a calorific value calculation circuit 71 to calculate the calorific value of each gas such as methane, ethane, etc., and the calorific value signal is sent to a first adder 72.

Further, a standard gas function unit 73 is provided which generates a standard calorific value signal based on fuel having a standard calorific value, and this standard calorific value signal is sent to the first adder 72 .

In the first adder 72, the standard calorific value signal is corrected by the gas analysis signal, and the corrected first correction signal is amplified in the gain circuit 74 and sent to the second adder 75.

Further, the set pressure signal generator 37 (40, 68...
) or a setting signal such as a control valve setting signal generated from the control valve setting signal generation circuit 51a is sent to the second adder 75.

The setting signal sent to the second adder 75 is corrected by the first correction signal.

This corrected second correction signal is sent to the stop valve] 7 or the control valve 18, and the fuel supply pressure or supply flow rate is controlled as described above.

In this way, the fuel supplied to the gas turbine 11 is analyzed by the gas analyzer 70, and the standard calorific value signal and setting signal are corrected by the gas analysis signal based on this analysis data, so that the fuel supplied to the gas turbine 11 is Regardless of the calorific value of the fuel, the calorific value is corrected in accordance with the standard calorific value of the fuel.

Therefore, when operating the gas turbine 11 using fuels with different calorific values, fuels with different calorific values corresponding to the standard calorific value fuel are supplied, and the speed of the gas turbine increases.
All operations such as loading and load shedding can be controlled in the same way as when operating with standard calorific value fuel.

〔Effect of the invention〕

As described above, when a gas turbine is operated using a plurality of fuels with different calorific values, the present invention provides a correction signal for correcting the calorific value of the fuels with different calorific values corresponding to the standard calorific value fuel. issued. This correction signal corrects the set pressure signal corresponding to the standard calorific value fuel, and the corrected control signal controls the stop valve that controls the fuel supply pressure.

Therefore, when the turbine is operated with fuel with a different calorific value, the fuel with the same calorific value is supplied as when using fuel with a standard calorific value, Operation can be controlled.

Further, the control valve setting signal is corrected by the correction signal corrected for the calorific value, and the adjusting valve that performs flow rate control is controlled by the corrected control signal. Therefore, even if fuels with different calorific values are used, the flow rate can be controlled so that the calorific value is the same as when fuel with a standard calorific value is used.

Furthermore, the combustion gas of the gas turbine combustor is extracted as an initial ignition failure signal and the latest ignition failure signal, and a correction signal is corrected for the calorific value based on the detected deviation signal between the initial ignition failure signal and the latest ignition failure signal. be done. This corrected control signal corrects the setting signal, and the corrected setting signal controls the control valve and the stop valve.

Therefore, even if the combustor, fuel supply pipes, etc. change over time due to clogging, etc., the supply pressure or flow rate control of fuel with a different calorific value is corrected to correspond to the change over time, so the gas turbine can ignite. It can be operated without failure.

Furthermore, the combustion gas being combusted is analyzed, the calorific value of this gas analysis signal is calculated, and the standard gas signal and setting signal are corrected based on this calorific value signal.

Since the stop valve or control valve is controlled by this corrected control signal, the fuels with different calorific values are corrected correspondingly to the fuel with the standard calorific value, and the turbine is controlled by the fuel with different calorific values. When operating at a standard temperature, the fuel can be operated satisfactorily with standard calorific value fuel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of the fuel supply control device for a gas turbine according to the present invention, and FIGS. 2, 3, and 4 show other embodiments of the fuel supply control device for a gas turbine shown in FIG. A schematic block diagram of main parts showing an example. FIG. 5 is a block diagram showing an outline of a gas turbine fuel supply control device commonly used in the past. 10... Compressor, 11... Gas turbine, 12...
- Generator, 13... Combustor, 14... LNG fuel supply system, 15... LPG fuel supply system, 16.20.
...Pipeline, 17.21...Stop valve, 18.22...
Control valve, 19a, 19b - nozzle, 23a, 2
3 b - Opening/closing valve, 24a, 24b - Purge line, 25.28.37.40.68... Set pressure generator, 27... Control signal generation circuit, 26.26a, 26b
, 29.52a... regulating valve setting signal generation circuit, 30.
41.52a...Selection circuit, 31.32.33...
Terminal, 35.36.46.47.57a, 57b,
66... Correction function generator, 34.45.55a,
6775... Adder, 60... Ignition failure calculation circuit,
6]...Initial memory circuit, 62...Latest memory circuit, 6
3.65.74...Gain circuit, 64.71...Arithmetic circuit, 70...Gas analyzer, 73...Standard gas function device.

Claims (1)

[Scope of Claims] 1. Fuels with different calorific values are selectively supplied through a stop valve that performs emergency shutoff of fuel and controls fuel supply pressure, and a control valve that controls fuel supply amount. A fuel supply control device for a gas turbine includes a selection circuit that generates a control signal corresponding to a selected fuel, and a calorific value correction signal for the selected fuel with respect to a fuel with a standard calorific value that is activated by the control signal of the selection circuit. a correction function generator that generates a correction function generator, a set pressure signal generator that generates a secondary set pressure signal corresponding to the rotational speed of the turbine with fuel having a standard calorific value, and a set pressure signal generator that corrects the set pressure signal of the set pressure signal generator. A fuel supply control device for a gas turbine, comprising an adder that performs correction using a correction signal from a function generator and controls a stop valve using the corrected control signal. 2. Gas turbine fuel supply control in which fuels with different calorific values are selectively supplied via a stop valve that performs emergency shutoff of fuel and controls fuel supply pressure, and a control valve that controls fuel supply amount. The device includes a selection circuit that generates a control signal corresponding to the selected fuel, and a correction function generator that is activated by the control signal of the selection circuit and generates a calorific value correction signal for the selected fuel with respect to a fuel with a standard calorific value. a control valve setting signal generation circuit that generates a control valve setting signal corresponding to a control signal of the gas turbine for fuel with a standard calorific value; 1. A fuel supply control device for a gas turbine, comprising: an adder that performs correction using a correction signal and controls a control valve using the corrected control signal. 3. The fuel supply for a gas turbine according to claim 1 or 2, wherein the calorific value correction signal of the correction function generator is corrected by a deviation signal between an initial ignition failure signal and a latest ignition failure signal. Control device. 4. A fuel supply control device for a gas turbine that selectively supplies fuels with different calorific values through a stop valve that performs emergency shutoff of fuel and controls fuel supply pressure, and a control valve that controls fuel supply amount. , a gas analyzer that is installed close to the combustor and analyzes combustion gas during combustion, a calorific value analysis calculation circuit that is calculated from the gas analysis signal of this gas analyzer and generates the calorific value analysis signal, and a standard a standard gas function device that generates a calorific value signal; and a first adder that corrects the standard calorific value signal of the standard gas function device using the calorific value analysis signal of the calorific value analysis calculation circuit and generates a first correction signal. and a setting circuit that generates a setting signal such as a secondary setting pressure signal corresponding to the rotation speed of the gas turbine when using fuel with a standard calorific value or a control valve setting signal corresponding to a control signal of the gas turbine when using fuel with a standard calorific value. , a second adder that corrects the setting signal of the setting circuit with the first correction signal of the first adder and controls the stop valve or the control valve with the corrected second correction signal. Gas turbine fuel supply control device.