JPH09236025A - Fuel supply device for gas turbine and its controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set fuel to an appropriate pressure and temperature according to the fuel request pressure of a gas turbine so as to be fed to a gas turbine combustor when the gas turbine is operated in heating fuel and reduced pressure operation. SOLUTION: A heater 27 to heat fuel is arranged in a fuel supply system 20, and also pressure reducing valves 29, 30 to reduce pressure of fuel after heated according to the fuel request pressure of a gas turbine 7 is arranged therein. A heating medium supply system 36, a vent system 37, an inert gas supply system 38 and a drain system 39 are arranged in the heater 27, and also a pressure reducing means control part 70, a fuel control part 71 and a fuel leak urgent treatment control part 72 are arranged in the pressure reducing valves 29, 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device and a control device for a gas turbine, and more particularly to a fuel for a gas turbine that sends fuel from a fuel storage section to a plurality of gas turbine combustors at appropriate temperatures and pressures. The present invention relates to a supply device and its control device.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 13, a fuel supply device for a gas turbine having an output of 100 MW or less as a practical machine uses a fuel in a fuel storage unit 1, for example, a LNG gas fuel as a fuel emergency shutoff valve 2 and a gas turbine. It is sent to the gas turbine combustor 5 via the inlet fuel cutoff valve 3 and the fuel flow rate control valve 4, where the high pressure air from the compressor 6 that has sucked in the atmosphere and has increased in pressure is added to generate combustion gas, which is then burned. Gas is sent as working fluid to the gas turbine 7 to perform expansion work, and the rotating torque obtained by the expansion work rotates the generator 8 to obtain an electric output.

Conventionally, in a practical machine as this type of output,
When the fuel in the fuel storage unit 1 is sent to the gas turbine combustor 5, the fuel pressure is given by the following equation, considering various losses and taking into consideration the pressure balance of the high pressure air from the compressor 6.

[0004]

## EQU1 ## P = P ₁ + P ₂ + P ₃ where P is the required fuel pressure required by the gas turbine 7, P ₁ is the discharge pressure of the compressor 6, and P ₂ is the gas turbine including the fuel nozzle and the like. Indicates the pressure loss of the combustor 5, P
₃ shows various losses in the fuel supply system.

When the required fuel pressure required by the gas turbine 7 is calculated based on the above equation, it is usually 20 to 25 atg.

However, as for the required fuel pressure, even if the above pressure value is proper, if some kind of sudden situation occurs, it becomes difficult to generate combustion gas in the gas turbine combustor 5, so that as shown in FIG. In some cases, a booster 9 may be provided on the inlet side of the gas turbine inlet fuel cutoff valve 3 to cope with an unexpected situation and take complete precautions.

By the way, in recent power plants, in consideration of effective use of land, as shown in FIG. 12, a plurality of gas turbine power plants or gas turbines are installed in one installation area or in another area. There is a tendency to install a combined power generation plant in combination with a steam turbine and also to unify the fuel storage unit for the power generation plant that has become a settlement, and in view of environmental issues, gas fuel such as LNG is often used.

From one fuel storage unit 1 to power plants A, B, ...
In order to make the fuel pre-pressure of the gas turbine combustors 5, 5, ... (Power demand pressure of the gas turbine) of the power stations A, B, ... P _A , P _B , ... , The fuel source pressure P ₀ was determined in consideration of the piping system loss, and this fuel source pressure P ₀ was adjusted by the pressure regulating valve 10.

However, this fuel source pressure P ₀ is determined on the basis of the fuel pre-pressure P _D required by the gas turbine combustor 5 of the power station farthest from the fuel storage unit 1, and the power station A The fuel pre-pressures P _A , P _B , ... Fluctuate depending on the operating conditions of the _B ,.

For example, when the power station A is stopped, the power stations B and C are in a partial load, and the power station D is in a full load operation mode, the gas turbine combustors 5, 5 of the power stations B, C, D ,. 5, ...
The fuel pre-pressure of the power plant is above the required value because the fuel to the power plant A is cut off, and therefore the power plants B, C, D, ...
The fuel pressure reducing operation in which the pressure reducing valves 11, 11, ... Are individually provided so as to achieve the required fuel pre-pressure of the gas turbine combustors 5, 5, 5 ,.

[0011]

By the way, in the case of adjusting the fuel pre-pressure of the gas turbine combustor, if the pressure is a single machine, regardless of the presence or absence of a booster, the pressure regulating valve 10 is sufficient for the fluctuation of the load of the gas turbine. Although it is possible to cope with this, there are some problems when the fuel pressure reduction operation is required for each gas turbine combustor of a plurality of power plants. (1) When decompressing the fuel, if the decompression amount is high, the saturation temperature of the fuel falls due to the so-called Joule-Thomson effect, and the fuel is easily liquefied. Therefore, when the combustion gas is generated in the gas turbine combustor. , The rich portion of the fuel is unevenly distributed, the abnormally high temperature of the combustion gas is generated, the NOx concentration becomes high, the nozzle burnout due to the local abnormal heating of the fuel nozzle portion or the combustion gas of the locally abnormally high temperature becomes a gas. It may be generated in the turbine 7 and flow as it is to burn out the combustor liner, the transition piece, the gas turbine stationary blades and the moving blades.

Further, when the fuel becomes rich, the combustion temperature temporarily rises, so it is necessary to narrow down the fuel, but if there is a time delay at that time, the supply pressure of the fuel supply line will decrease. , Flashback to the fuel system occurred,
There is a possibility that a situation of burning up to the upstream side may occur.

(2) When the fuel pressure reducing operation is performed, the pressure reducing valve 1
The pulsation of fuel accompanying the opening / closing operation of 1 affects the opening / closing operations of the gas turbine inlet fuel cutoff valve 3 and the fuel flow rate control valve 4,
For this reason, the valve stem excessively hunts and becomes a cause of cut-off, and in an emergency such as a first cutback operation (independent operation in the power plant), the fuel supply itself undergoes a large pressure fluctuation, and in some cases, the gas turbine combustor. There is a risk that the combustion gas of the above may cause a misfire. Also, if the fuel becomes rich,
There is a risk that the combustion temperature will rise temporarily and burn the combustor liner, transition piece, gas turbine stationary blades and moving blades.

The present invention has been made under such circumstances, and in the fuel heating / depressurizing operation of the gas turbine, the fuel of the gas turbine is sent to the gas turbine combustor as fuel of appropriate pressure / temperature. An object of the present invention is to provide a supply device and its control device.

Another object of the present invention is to preheat the fuel before depressurizing it in the depressurizing operation of the gas turbine.
It is an object of the present invention to provide a fuel supply device for a gas turbine and a control device for the gas turbine, which satisfactorily treats steam or hot water as a heating source thereof and satisfactorily treats non-condensable gas and drain generated during heating.

Another object of the present invention is to preheat the fuel before depressurization in the gas depressurization operation of the gas turbine,
It is an object of the present invention to provide a fuel supply device for a gas turbine and a control device therefor, which automatically and surely treats a fuel leak even when a fuel leaks during heating.

Another object of the present invention is to enable the fuel to quickly respond to the required fuel pressure of the gas turbine even if the pressure reduction of the fuel is not appropriate in the fuel pressure reduction operation of the gas turbine. An object of the present invention is to provide a fuel supply device for a gas turbine and its control device.

Another object of the present invention is to provide a fuel supply device for a gas turbine and a control device for the same, which provide sufficient measures for rust-preserving storage of components of the fuel supply system while the gas turbine is not operating. It is in.

[0019]

In order to achieve the above object, a fuel supply system for a gas turbine according to the present invention has a plurality of gas turbine combustors for supplying fuel in a fuel storage section to a fuel tank. To the fuel supply system, a heater for heating the fuel, a decompression unit for decompressing the heated fuel according to the required fuel pressure of the gas turbine, and a fluctuation of the fuel pressure after decompression. It is provided with a surge tank for absorbing each.

In the fuel supply device for a gas turbine according to the present invention, in order to achieve the above object, as described in claim 2, the pressure reducing means is at least one or more pressure reducing valves and orifices. It is characterized by that.

In order to achieve the above object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 3, the pressure reducing valve is divided into a large pressure reducing valve and a small pressure reducing valve. A valve and a pressure reducing valve are installed in parallel.

In order to achieve the above object, in the fuel supply system for a gas turbine according to the present invention, as described in claim 4, the orifice is divided into a large diameter orifice and a small diameter orifice. The orifice of small diameter and the orifice of small diameter are installed in parallel.

In order to achieve the above object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors. A heater for heating the fuel is provided in the fuel supply system, and a heating medium supply system for supplying a heating medium as a heating source of the fuel to the heater and a non-condensed gas generated during heating of the fuel are provided. A vent system for discharging the gas to the outside of the device and a drain system for discharging the drain generated during the heating of the fuel to the outside of the device are respectively provided.

In order to achieve the above object, in the gas turbine fuel supply system according to the present invention, as described in claim 6, the heating medium supplied to the heater is either steam or hot water. It is characterized by that.

In order to achieve the above object, the fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending the fuel in the fuel storage section to a plurality of gas turbine combustors, as set forth in claim 7. The fuel supply system is provided with a heater for heating the fuel and an inert gas supply system for supplying an inert gas to the heater which is not in operation.

In order to achieve the above object, the fuel supply system for a gas turbine according to the present invention is characterized in that the inert gas is any one of nitrogen gas and argon gas. It is what

In order to achieve the above object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, as set forth in claim 9. The fuel supply system is provided with a heater for heating the fuel, and a decompression means and a gas turbine combustor inlet fuel cutoff valve are provided on the downstream side of the heater while the gas turbine combustor inlet fuel cutoff valve is provided. A pressure reducing means control unit is provided for detecting the inlet side fuel pressure and, when the detected pressure is higher than the fuel required pressure of the gas turbine, supplying a pressure reducing control signal to the pressure reducing means.

In order to achieve the above-mentioned object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 10, the pressure reducing means control unit is provided with a gas turbine combustor inlet fuel cutoff valve at the actual inlet side. The configuration is such that it has a comparator for matching the fuel pressure signal with the fuel required pressure signal of the gas turbine, and a calculation section for giving a pressure reducing control signal to the pressure reducing means based on the deviation of this comparator.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, as set forth in claim 11. The fuel supply system is provided with a heater for heating the fuel, and the depressurizing means is provided on the downstream side of the heater, while detecting the actual fuel pressure and the actual fuel temperature on the downstream side of the depressurizing means, A heating medium control unit for providing a valve opening / closing signal is provided to the heating medium control valve of the heating medium supply system for supplying the heating medium to the heater based on the detected pressure signal and the detected temperature signal.

In order to achieve the above-mentioned object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 12, the heating medium control unit outputs the actual fuel pressure signal on the downstream side of the pressure reducing means. A function unit for calculating the saturation temperature of the fuel based on the comparator, a comparator for matching the output signal of the function unit with the actual fuel temperature signal detected from the downstream side of the pressure reducing means, and the deviation of the comparator The heating medium control valve is configured to have a calculation unit that gives a valve opening / closing signal.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, as set forth in claim 13. A heater for heating the fuel is provided in the fuel supply system, and a depressurizing means is provided on the downstream side of the heater, while the actual fuel temperature on the downstream side of the depressurizing means is detected to detect the actual temperature. A heating medium control unit for providing a valve opening / closing signal to the heating medium control valve of the heating medium supply system for supplying the heating medium to the heater based on a signal is provided.

In order to achieve the above object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 14, the heating medium control unit outputs the actual fuel temperature signal on the downstream side of the pressure reducing means. The configuration is such that it has a comparator for matching the preset temperature signals from the preset temperature setter and a calculator for giving a valve opening / closing signal to the heating medium control valve based on the deviation of the comparator.

In order to achieve the above-mentioned object, in the fuel supply device for a gas turbine according to the present invention, as set forth in claim 15, the set temperature signal of the temperature setter corresponds to the fuel supply pressure at the gas turbine inlet. The fuel temperature is set higher than the dew point temperature of the fuel.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, as set forth in claim 16. The fuel supply system is provided with a heater for heating the fuel, and the depressurizing means is provided on the downstream side of the heater, while the actual fuel pressure on the downstream side of the depressurizing means, the actual fuel temperature, and The actual medium pressure of the heater is detected, and the heating medium is adjusted in the heating medium supply system that supplies the heating medium to the heater based on the detected actual fuel pressure signal, the detected actual fuel temperature signal and the in-detector pressure signal. A heating medium control unit for giving a valve opening / closing signal to the valve is provided.

In order to achieve the above-mentioned object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 17, the heating medium control unit sends the actual fuel pressure signal on the downstream side of the pressure reducing means. A function unit for calculating the saturation temperature of the fuel based on the comparator, a comparator for matching the output signal of the function unit with the actual fuel temperature signal detected from the downstream side of the pressure reducing means, and the deviation of the comparator The heating medium control valve which adds a valve opening / closing signal generated based on the pressure signal in the actual device of the heating device to the operation unit which gives a valve opening / closing signal to the heating medium control valve. And a valve opening degree limiter for limiting the valve opening degree.

In order to achieve the above object, in the fuel supply system for a gas turbine according to the present invention, as described in claim 18, the valve opening limit signal of the valve opening limiter is the actual device of the heater. The internal pressure and the set pressure signal from the pressure setting device set to the atmospheric pressure or more in advance are collated and created based on the deviation signal.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention comprises, as described in claim 19, a fuel supply system for sending the fuel in a fuel storage section to a gas turbine combustor. A heater for heating fuel is provided in the fuel supply system, and a decompression valve is provided on the downstream side of the heater, while the actual fuel pressure on the downstream side of the decompression valve or the inlet side of the gas turbine combustor is provided. Of the actual fuel pressure on the inlet side of the fuel cutoff valve at the inlet of the gas turbine combustor, the actual fuel pressure of either one is detected, and when the detected pressure is higher than the required fuel pressure of the gas turbine, the combustion of the gas turbine is performed. A valve open signal is given to the fuel emergency relief valve provided on the inlet side of the unit inlet fuel cutoff valve, and conversely, when the detected pressure is lower than the fuel required pressure of the gas turbine, a valve close signal is given to the fuel emergency relief valve. When When the detected pressure continues to be higher than the required fuel pressure of the gas turbine even after the fuel emergency relief valve is opened / closed, the fuel cutoff valve provided between the heater and the pressure reducing valve. Is provided with a fuel control section for giving a valve closing signal.

In order to achieve the above object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 20, the fuel control unit is configured so that the actual fuel pressure signal or gas on the downstream side of the pressure reducing valve is changed. A comparator that matches one of the fuel pressure signals on the actual inlet side of the turbine inlet fuel cutoff valve to the fuel demand pressure signal of the gas turbine, and gives a valve opening / closing signal to the fuel emergency relief valve based on the deviation of this comparator. A calculation unit and a calculation unit that gives a valve closing signal to the fuel cutoff valve via a timer circuit when the actual fuel pressure signal is higher than the fuel demand pressure of the gas turbine even after the fuel emergency relief valve is opened. It is configured to have.

In order to achieve the above object, the fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending the fuel in the fuel storage section to a plurality of gas turbine combustors, as set forth in claim 21. The fuel supply system is provided with a heater for heating the fuel, and an inert gas supply system for supplying an inert gas is provided while the heater is not operating. The active gas emergency shutoff valve and the inert gas control valve are provided with an inert gas control unit which gives a valve opening signal when the internal pressure of the heater becomes lower than the atmospheric pressure.

In order to achieve the above-mentioned object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 22, the inert gas control section detects the internal pressure of the heater, A comparator for matching the pressure signal in the detector with the atmospheric pressure signal, and an inert gas emergency shutoff valve and an inert gas control valve when the pressure signal in the detector has a zero or negative deviation from the atmospheric pressure signal. An operation unit that produces a valve opening signal of
A configuration having an AND circuit for giving a valve opening signal to the inert gas emergency shutoff valve and the inert gas control valve on condition that the valve opening signal of the arithmetic unit and the signal for stopping the operation of the heater are aligned It was done.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention has a fuel supply system for sending the fuel in a fuel storage section to a plurality of gas turbine combustors. A heater for heating the fuel is provided in the fuel supply system, and the drain generated during heat exchange between the heating medium from the heating medium supply system provided in the heater and the fuel from the fuel storage unit. Is provided with a drain control section for giving a valve opening / closing signal to the drain control valve of the drain system provided in the heater.

In order to achieve the above object, in the fuel supply device for a gas turbine according to the present invention, as described in claim 24, the drain controller detects the water level inside the heater,
A comparator for matching the water level signal in the detector to a given value,
And a calculation unit that gives a valve opening / closing signal to the drain control valve based on the deviation of the comparator.

In order to achieve the above-mentioned object, a fuel supply system for a gas turbine according to the present invention comprises, as described in claim 25, a fuel supply system for sending fuel from a fuel storage section to a gas turbine combustor. A heater for heating the fuel is provided in the fuel supply system, and a heating medium supply system for supplying a heating medium as a heating source of the fuel to the heater and a non-condensable gas generated during heating of the fuel are supplied to the heater. One is provided with a vent system for discharging outside, a drain system for discharging generated drain during heating of fuel to the outside of the vessel, and an inert gas supply system for supplying an inert gas while the heater is not in operation. During the heat exchange between the fuel and the heating medium, when one of the fuel leak detector provided in the vent system and the pressure switch provided in the heater detects a fuel leak in the vessel, the fuel supply system Set on Main valve, heating medium emergency shutoff valve provided in the heating medium supply system, drain emergency shutoff valve provided in the drain system, vent emergency shutoff valve provided in the vent system, inert gas provided in the inert gas supply system A fuel leak emergency processing control unit is provided for giving a valve closing signal to each of the gas emergency shutoff valves and for giving a valve opening signal to the non-condensable gas vent relief valve provided in the vent system.

In order to achieve the above object, in the fuel supply system for a gas turbine according to the present invention, as described in claim 26, the fuel leak emergency processing control unit includes a leak fuel pressure in the vent system or a heater. A comparator that detects the internal pressure and matches either detection signal to a given pressure, and based on the deviation of this comparator, the fuel source valve, heating medium emergency shutoff valve, drain emergency shutoff valve, vent emergency shutoff The valve and the inert gas emergency shutoff valve are provided with a valve closing signal, and an arithmetic unit for giving a valve opening signal to the noncondensable gas vent relief valve.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fuel supply system for a gas turbine and a control system therefor according to the present invention will be described below with reference to the drawings. Although fuel is sent from one fuel storage unit to a plurality of gas turbines, one gas turbine will be described as an example for one fuel storage unit.

FIG. 1 is a schematic system diagram showing a first embodiment of a fuel supply system for a gas turbine and a control system therefor according to the present invention.

The fuel supply system generally designated by the reference numeral 20 is adapted to send the fuel in the fuel storage section 21, for example, gaseous fuel such as LNG, to the gas turbine combustor 23 via the header 22. In the fuel supply system 20, the fuel source valve 24 and the fuel source valve 2 are arranged along the flow of the fuel distributed from the header 22.
A bypass valve 25, a strainer 26, and a heater 27, which are arranged in parallel with each other, are provided.

Bypass valve 25 in parallel with fuel source valve 24
Before starting, when the fuel is poured from the fuel storage unit 21 into the fuel supply system 20, since the fuel itself has a high pressure, a hammer phenomenon may occur under this high pressure. When this hammer phenomenon occurs, it is installed so that a small amount of fuel flows to the gas turbine combustor 23 in order to prevent damage to the components of the fuel supply system 20. The strainer 26 is provided to prevent the impure foreign matter from flowing into the gas turbine combustor 23 even if the fuel contains the impure foreign matter. When the gas turbine 7 obtains a fuel pressure suitable for a load, the heater 27 preheats the fuel so that the fuel is not partially liquefied when the fuel pressure is reduced to the obtained fuel pressure.

The fuel cutoff valve 2 is provided downstream of the heater 27.
8. A surge tank 31 is provided via a pressure reducing large valve 29 having a large diameter and a pressure reducing small valve 30 having a small diameter installed in parallel. The fuel cutoff valve 28 is used for the fuel storage unit 21 when the pressure is reduced by the large pressure reducing valve 29 and the small pressure reducing valve 30 and still higher than the required fuel pressure of the gas turbine 7.
It is a valve that cuts off the supply of fuel from. Further, the reason why the large pressure reducing valve 29 having a large diameter and the small pressure reducing valve 30 having a small diameter are classified is that there is an excessive pressure difference between the fuel pressure required by the gas turbine 7 and the fuel pressure supplied from the fuel storage section 21. If there is, the fuel is gradually reduced by the pressure reducing small valve 30 having a small diameter first, and then the pressure reducing small valve 30 having a small diameter and the pressure reducing large valve 29 having a large diameter are used together to reduce the pressure to the fuel required pressure of the gas turbine 7. By doing so, a hammer phenomenon or the like due to a sudden change in fuel pressure can be avoided, and damage to component equipment can be prevented. The large pressure reducing valve 29 may be replaced with a large diameter orifice, and the small pressure reducing valve 30 may be replaced with a small diameter orifice. Further, in the surge tank 31, the fuel flow rate-pressure of the fuel supply system 20 drastically changes at the time of starting the gas turbine 7 or during the first cutback operation. A fuel pulsation due to an increase in fuel pressure due to an inability to completely depressurize, and a fuel pulsation due to a pressure drop of fuel that occurs due to excessive reduction of the valve opening of the large pressure reducing valve 29 and the small pressure reducing valve 30. Is.

On the downstream side of the surge tank 31, the fuel emergency relief valve 3 is branched from the middle and communicates with the atmosphere at one side.
3 is provided, and the gas turbine combustor 2 is provided on the other side.
3, a stop valve 32, a gas turbine inlet fuel cutoff valve 34, and a gas turbine inlet fuel control valve 35, which are connected to No. 3, are provided. Even if the fuel pressure is reduced by the large pressure reducing valve 29 and the small pressure reducing valve 30, the fuel emergency relief valve 33 transiently has a part of the fuel when the fuel pressure is transiently higher than the required fuel pressure of the gas turbine 7. Is a valve that is closed when the fuel pressure drops to the required fuel pressure of the gas turbine 7. The stop valve 33 will be described later.
When the inert gas is supplied to the heater 27, or before starting, when the fuel in the fuel storage unit 21 is put into the fuel supply system 20, the gas is isolated from the gas turbine combustor 23, and the gas turbine inlet fuel is also used. Shut-off valve 34
Means that when an unexpected situation occurs in the gas turbine 28, the fuel to the gas turbine combustor 23 is cut off. Further, the gas turbine inlet fuel control valve 35 is
The fuel flow rate is controlled in accordance with the load demand of.

A heating medium supply system 36 for supplying steam or hot water as a heat source for heating the fuel from the fuel storage section 21 to the heater 27 of the fuel supply system 20 having the above-mentioned structure.
And a vent system 37 for releasing the non-condensable gas generated during heat exchange between the fuel from the fuel storage unit 21 and the steam or hot water from the heating medium supply system 36, and the heat exchange of fuel and heating During operation of the heater 27 and the drain system 39 that causes the drain generated in the device to flow out of the device, an inert gas such as nitrogen gas or argon gas is used to prevent rusting of components such as heat transfer tubes in the device. An inert gas supply system 38 for supplying the gas is provided.

The heating medium supply system 36, for example, serves as a steam source 40 as an auxiliary steam boiler, and when a fuel leak occurs in the heater 27 during heating of the fuel, the leaked fuel flows into the steam source 40. The heating medium emergency shut-off valve 41 to be cut off, and the heating medium control valve 4 that appropriately controls the heating medium flow rate when the heating medium from the steam source 40 is supplied to the heater 27.
2 and a check valve 85. In addition, this steam source 40
In order to prevent a part of the fuel in the fuel supply system 20 from being cooled or liquefied by the Joule-Thomson effect when the fuel passes through the large pressure reducing valve 29 and the small pressure reducing valve 30,
A valve opening / closing signal is given to the heating medium adjusting valve 42 by a detection signal from a fuel pressure detector 43 and a fuel temperature detector 44 provided on the downstream side of the large pressure reducing valve 29 and the small pressure reducing valve 30 to pass through the heater 27. The heating medium control unit 45 is provided to control the pressure and temperature of the fuel to be cooled or liquefied.

As shown in FIG. 2, the heating medium control unit 45 calculates the saturation temperature based on the detection signal of the fuel pressure detector 43, and the saturation temperature calculated by the function unit 46. It is configured to have a comparator 47 that matches the actual fuel temperature from the fuel temperature detector 44, and a calculation unit 48 that produces a valve opening / closing signal based on the deviation of the comparator 47. Since the specific gravity differs depending on the type of fuel, and the saturation temperature also varies depending on the specific gravity, the function unit 46 is functionalized by giving a margin to the fuel having a high specific gravity.

As shown in FIG. 1, the vent system 37 vents the non-condensable gas generated by the impurities contained in the heating medium in the heater 27 during the heating of the fuel to the vent emergency shutoff valve 4.
9, through the check valve 50 and the orifice 51, the presence or absence of leak fuel mixed in the non-condensable gas generated in the heater 27 and the exhaust portion 52 discharged to the atmosphere or the blow tank is detected. It is configured to have a leak fuel detector 53 and a non-condensable gas vent relief valve 54 that releases the non-condensable gas to the atmosphere when leak fuel is mixed in the non-condensed gas.

The drain system 39 is a drain control valve 55 for controlling the water level of the drain produced in the heater 27.
The drain emergency shutoff valve 56, which shuts off the drain out of the heater when leak fuel is present in the heater 27, and the check valve 5
7 and 7.

Further, the drain system 39 includes a drain controller 5
8 are provided. The drain control unit 58 has a water level detector 59 for detecting the water level of the drain in the heater 27. The drain control valve 55 is opened / closed by the detection signal of the water level detector 59 to properly adjust the drain water level. It maintains the water level.

More specifically, as shown in FIG. 3, the drain control unit 58 uses the water level signal of the water level detector 59 as a predetermined drain water level value 9 which is predetermined and input to a storage device such as a memory.
It has a comparator 60 that matches 0, and a calculation unit 61 that creates a valve opening / closing signal based on the deviation of the comparator 60 and applies the opening / closing signal to the drain control valve 55.

The inert gas supply system 38 is provided with an inert gas storage section 62, and during operation of the heater 27, leakage from the heater 27 to the inert gas supply system 38 is dealt with in the event of leak fuel. An inert gas emergency shutoff valve 63 for cutting off the reverse flow of fuel, an inert gas control valve 64 for controlling the flow rate when the inert gas from the inert gas storage section 62 is supplied to the heater 27, and a check valve 65. Is equipped with.

Further, the inert gas supply system 38 is provided with an inert gas control section 65. The inert gas control unit 65 includes a pressure detector 6 that detects the internal pressure of the heater 27.
6, a valve opening signal is given to the inert gas emergency shutoff valve 63 and the inert gas control valve 64 by the detection signal of the pressure detector 66. That is, the specific configuration of the inert gas control unit 65 is as shown in FIG.
The internal pressure of 7 is detected by the pressure detector 66, and the comparator 67 that matches the atmospheric pressure signal 91 with the detection signal is provided.
When the deviation of the comparator 67 becomes zero or negative, a calculation unit 68 that generates a valve opening signal of the inert gas emergency cutoff valve 63 and the inert gas control valve 64, and the valve opening signal of the calculation unit 68 and the above It has an AND circuit 69 for giving a valve opening signal to the inert gas emergency shutoff valve 63 and the inert gas control valve 64 on condition that the operation stop signal 92 of the heater 27 is complete.

On the other hand, in the fuel supply system 20, a pressure reducing means control section 70 for giving appropriate valve opening / closing signals to the large pressure reducing valve 29 and the small pressure reducing valve 30 in accordance with the fuel demand pressure of the gas turbine 7.
When the actual pressure of the fuel is higher than the required fuel pressure of the gas turbine 7, there is a fuel leak in the fuel controller 71 and the heater 27 that adjust the fuel pressure to the required fuel pressure of the gas turbine 7. At this time, a heating medium supply system 36, a vent system 37, an inert gas supply system 38, and a fuel leak emergency processing control unit 72 for cutting off leak fuel to the drain system 39 are provided.

The pressure reducing means control section 70 is provided with a fuel pressure detector 7 provided on the inlet side of the gas turbine inlet fuel cutoff valve 34.
A valve opening / closing signal is given to the large pressure reducing valve 29 and the small pressure reducing valve 30 based on the actual fuel pressure of No. 3, and the specific configuration is as shown in FIG. 5, the actual fuel detected by the fuel pressure detector 73. A comparator 74 that matches the pressure signal with the fuel demand pressure signal 93 of the gas turbine 7, and a computing unit 75 that produces a valve opening / closing signal to be given to the large pressure reducing valve 29 and the small pressure reducing valve 30 based on the deviation from the comparator 74. It is equipped with and.

The fuel control unit 71 includes a fuel pressure detector 43 provided on the downstream side of the large pressure reducing valve 29 and a small pressure reducing valve 30 and a fuel pressure detector 73 provided on the inlet side of the gas turbine inlet fuel cutoff valve 34. Based on at least one of the actual fuel pressures, a valve open signal is given to the fuel emergency relief valve 33, and a valve close signal is given to the fuel cutoff valve 28, and its configuration is as shown in FIG. Fuel pressure detector 43, 73
Of the actual fuel pressure signals detected by the OR circuit 76 and the actual fuel pressure signal selected by the OR circuit 76 are compared with the fuel demand pressure signal 94 of the gas turbine 7. Unit 77 and this comparator 7
7 is used to generate a valve opening / closing signal to be given to the fuel emergency relief valve 33 on the basis of the deviation from 7, and the fuel pressure of the fuel supply system 20 is the gas turbine 7 even if fuel is released from the fuel emergency relief valve 33 to the atmosphere. If the pressure is still higher than the required fuel pressure, the arithmetic circuit 80 for energizing the timer circuit 79 to generate a valve closing signal to be given to the fuel cutoff valve 28 is provided.

When the pressure detected by either the pressure switch 81 provided in the heater 27 or the leak fuel detector 53 of the vent system 37 is higher than a given value, the fuel leak emergency processing control unit 72 heats the fuel. It is considered that there was a fuel leak in the container 27, and the fuel source valve 24 of the fuel supply system 20, the heating medium emergency shutoff valve 41 of the heating medium supply system 36, the drain system 3
The drain emergency shutoff valve 56 of 9, the vent emergency shutoff valve 49 of the vent system 37, and the inert gas emergency shutoff valve 63 of the inert gas supply system 38 give a valve closing signal to each of them, while the noncondensable gas vent of the vent system 37 is provided. A valve opening signal is given to the relief valve 54. That is, as its specific configuration, as shown in FIG. 7, an OR circuit 82 for selecting one of the signals detected by the leak fuel detector 53 of the vent system 37 or the pressure switch 81 of the heater 27. , A comparator 83 for matching the signal selected by the OR circuit 82 with a predetermined pressure value 95 input to a storage device such as a memory that is determined in advance, and based on the deviation of the comparator 83,
It generates a valve closing signal to be given to the heat source fuel source valve 24, the heating medium emergency shutoff valve 41, the drain emergency shutoff valve 56, the vent emergency shutoff valve 49, the inert gas emergency shutoff valve 63, and the noncondensable gas vent relief valve 54. And a computing unit 84 that produces a given valve opening signal.

Next, the operation based on the above configuration will be described.

Before starting the gas turbine 7, the fuel supply system 20
The stop valve 32 for isolating the gas turbine combustor 23 and the gas turbine combustor 23 is in a valve closed state, and the fuel in the fuel storage unit 21 is filled in the fuel supply system 20. In this case, since the fuel pressure reaches about 70 atg, the bypass valve 25 is opened to avoid the hammer phenomenon and the like, and the fuel is supplied to the fuel supply system 20 from here.

During the start-up of the gas turbine, the stop valve 32 is opened prior to the start-up, and the heater 27 of the fuel supply system 20 is supplied with the heating medium from the heating source 40 of the heating medium supply system 36. Heating the fuel. The amount of the heating medium required for heating the fuel is maintained at a fuel temperature (at least the saturation temperature of the fuel) at which part of the heating medium is not liquefied when the fuel pressure described later is reduced. A valve opening / closing signal is given to the medium control valve 42 for adjustment.

The fuel discharged from the heater 27 is depressurized by the large depressurizing valve 29 and the small depressurizing valve 30 so as to match the required fuel pressure of the gas turbine 7. The valve opening / closing of 30 is performed by the pressure reducing valve control unit 70.
Is given by the order from.

However, the large pressure reducing valve 29 and the small pressure reducing valve 3
Even if the fuel pressure is reduced by 0, it may still be higher than the required fuel pressure of the gas turbine 7. An example is a first cutback operation (independent operation in the power plant) or a trip of the gas turbine 7. During the first cutback operation or the trip of the gas turbine, the gas turbine inlet fuel cutoff valve 34 is closed, and the fuel gas turbine combustor 2 is closed.
This is because the fuel supply system 20 is instantaneously, but transiently, at an abnormal fuel pressure because the supply to the fuel cell 3 is cut off. A surge tank 31 is provided to suppress such a transient increase in fuel pressure.

Further, the fuel control section 71 issues a valve opening command to the fuel emergency relief valve 33 to release the fuel of the fuel supply system 20 to the atmosphere. If the pressure drops to the specified pressure,
A signal to close the fuel emergency relief valve 33 is issued. Further, even if the abnormal fuel pressure is dealt with, when the fuel pressure is still high, the fuel control unit 71 issues a valve closing command to the fuel cutoff valve 28 to supply the fuel from the fuel storage unit 21 to the fuel supply system 20. I'm trying to cut it.

On the other hand, during heating of the fuel, the heater 27 produces drain and non-condensable gas. The drain loses most of the heat energy after heat exchange with the fuel, and if it is left as it is, the water level becomes abnormal and the heat exchange rate with the fuel deteriorates. Therefore, the water level detector 59 constantly detects the water level inside the heater 27, and when the detected value exceeds the given drain water level value 90, the drain control valve 55 causes the drain control valve 55 to be instructed by the drain controller 58. Open the valve, heater 2
The water level in vessel 7 is properly adjusted. In addition, since the non-condensable gas generated in the heater 27 during fuel heating also deteriorates the heat exchange rate of fuel, the intention of heat recovery from the exhaust portion 52 of the vent system 37 to, for example, the blow tank of the combined cycle power plant. It has been sent out under or released into the atmosphere as it is.

By the way, during the processing of the drain and the non-condensable gas generated inside the heater 27 to the outside of the container, there is a risk of fuel leakage due to corrosion of the heat transfer tube inside the container or seal wear. Since the fuel leak adversely affects other components, the leak fuel detector 53 of the vent system 37 always detects the presence of leak fuel in the non-condensed gas, and the pressure attached to the heater 27. Switch 8
1 always detects whether or not the leak fuel is mixed in the drain. Since the fuel pressure is higher than the drain pressure,
When the drain pressure is higher than the given pressure 95, it is considered that the fuel leak is included.

When either the leak fuel detector 53 or the pressure switch 81 detects leak fuel, the fuel source valve 24,
The heating medium emergency shutoff valve 41, the drain emergency shutoff valve 56, the vent emergency shutoff valve 49, the inert emergency shutoff valve 63 are closed, and the non-condensed gas vent relief valve 54 is opened to release the leak fuel to the atmosphere. Prevents adverse effects on other components.

On the other hand, while the operation of the heater 27 is stopped, the heat transfer tube of the heater 27 is worn due to the ingress of air or the like through the gaps between the joints of the pipes and the valve rods of the various valves and the residual noncondensable gas in the chamber. Therefore, it is necessary to prevent corrosion. In this case, the pressure detector 66 attached to the heater 27 detects the internal pressure of the heater 27, and when the detected pressure becomes zero or negative as compared with the atmospheric pressure, it is necessary to stop the operation of the heater 27. In response to a command from the inert gas control unit 65, the inert gas emergency shutoff valve 63 and the inert gas control valve 64 are opened, and the heater 27
Nitrogen gas from the inert storage unit 62 is supplied to the heater 27 to prevent the heater 27 from rusting.

FIG. 8 is a schematic system diagram showing a second embodiment of the fuel supply system for a gas turbine and the control system therefor according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals, and only different components will be described.

The present embodiment is provided with a heating medium control unit 96 for controlling the opening / closing of the heating source control valve 42 only by the temperature change of the fuel passing downstream of the large pressure reducing valve 29 and the small pressure reducing valve 30. is there.

As shown in FIG. 9, the heating source controller 96 detects the temperature of the fuel passing through the large pressure reducing valve 29 and the small pressure reducing valve 30 with the fuel temperature detector 44 and compares the temperature detection signals. When a deviation is generated by matching the preset signal from the temperature setting device 98 set in advance by the device 97, the deviation signal is PI-calculated by the calculation part 99 to generate a valve opening / closing signal, and the heating medium control valve 42 is controlled to open / close the valve. It is supposed to do. It should be noted that, on the assumption that the fuel is depressurized to a predetermined pressure by the large depressurizing valve 29 and the small depressurizing valve 30, the temperature setter 98 inputs the dew point temperature or higher corresponding to the depressurized pressure as the set temperature. Has been done.

As described above, in the present embodiment, the heating medium control section 96 for controlling the opening / closing of the heating medium control valve 42 at the temperature of the fuel is provided to simplify the control mechanism. Control can be performed.

FIG. 10 is a schematic system diagram showing a third embodiment of the fuel supply system for a gas turbine and the control system therefor according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals, and only different components will be described.

In this embodiment, a valve opening / closing signal is sent to the heating medium control valve 42 based on the internal pressure of the heater 27 and the pressure and temperature of the fuel passing through the downstream side of the large pressure reducing valve 29 and the small pressure reducing valve 30. The valve opening calculation unit 108 for giving and the valve opening calculation unit 1
The heating medium control unit 100 for controlling the heating medium control valve 42 by limiting the valve opening / closing signal generated in 08 is provided.

In the fuel supply system 20, when the air temperature rises, such as in summer, the temperature of the fuel itself also rises to a temperature above the dew point temperature, so that heating of the fuel by the heater 27 is not necessary. Therefore, when the temperature is high such as in the summer, the fuel supply system 20 performs the fuel supply operation in which the heating medium control valve 42 is fully closed and the fuel is supplied to the gas turbine combustor 23 without heating the fuel.

However, during the fuel supply operation, the drain is generated in the heater 27, and the drain temperature is 100 ° C.
The following is often the case: Therefore, the heater 2
7, the internal pressure becomes the saturation pressure corresponding to the drain temperature,
A so-called atmospheric pressure or lower vacuum may occur. When the inside of the device is in a vacuum state, air from the flange of the pipe or the like may enter the heater 27, corrode the heat transfer pipe and the like, and cause fuel leak leakage.

Therefore, in this embodiment, the pressure detector 101 for detecting the internal pressure of the heater 27 is provided, and the fuel pressure detector 43 for detecting the pressure detection signal of the pressure detector 101 and the fuel pressure / temperature. The heating medium control valve 42 opens and closes the heating medium control valve 42 based on the respective signals from the fuel temperature detector 44 and restricts the opening degree of the heating medium control valve 42 to maintain the internal pressure of the heater 27 at atmospheric pressure or higher. 100 is provided.

As shown in FIG. 11, the heating medium control section 100 detects the fuel pressure with the fuel pressure detector 43, calculates the saturation temperature of the pressure detection signal with the function unit 102, and calculates the calculated saturation temperature. A valve opening calculation unit 108 that produces a valve opening / closing signal by comparing the signal with the actual fuel temperature signal from the fuel temperature detector 44 at a comparatively 103 and performing a PI calculation on the deviation signal when a deviation occurs. The valve opening degree limiter 105 for limiting the valve opening / closing signal from the valve opening degree calculation unit 108 is provided. Further, to the valve opening limiter 105, an actual instrument internal pressure calculation signal calculated by detecting the instrument internal pressure of the heater 27 by the pressure detector 101 is input. The actual instrument internal pressure signal detected by the pressure detector 101 is the pressure setter 1 which is set in advance to the atmospheric pressure or higher by the comparator 107.
The set pressure signal from 06 is matched, and when a deviation occurs, the deviation signal is input to the valve opening degree limiter 105.

The valve opening limiter 105 produces a valve opening / closing signal based on the operation signal from the valve opening operation unit 108 and the operation signal from the comparator 107 to open / close the heating medium control valve 42. It is designed to be controlled.

As described above, in this embodiment, when the temperature is high such as in the summer, the heating medium from the heating medium control valve 42 is supplied to the heating device 27 so that the heating device 27 does not become in a vacuum state. Since the heating medium control unit 100 for maintaining 27 at atmospheric pressure or higher is provided, the air does not enter the heater 27, the corrosion of the heat transfer tube due to the air can be prevented, and as a result, the fuel leak leakage is surely ensured. Can be prevented.

[0086]

As described above, in the fuel supply device for the gas turbine according to the present invention, the heater and the pressure reducing means are provided in the fuel supply system in the fuel pressure reducing operation of the gas turbine,
Since the fuel of appropriate pressure and temperature is supplied to the gas turbine combustor according to the required fuel pressure of the gas turbine, it is possible to avoid partial liquefaction of the fuel due to pressure reduction.

Further, in the fuel supply device for the gas turbine according to the present invention, when the fuel is heated by the heater, the heating medium supply system as a heating source is provided and the drain and the non-condensed gas generated during the heating of the fuel are provided. Since the drain system and the vent system for treating the above are provided, the fuel can be heated well.

Further, in the fuel supply device for the gas turbine according to the present invention, since the heater is provided with an inert gas supply system to prevent rust while the heater is not in operation, foreign matter is not mixed into the fuel. It can be prevented.

Further, in the fuel supply control device for the gas turbine according to the present invention, in the fuel pressure reducing operation of the gas turbine, the pressure reducing valve or the orifice is provided with the pressure reducing means controller to control the fuel pressure of the fuel supply system. Even when the fuel pressure of the fuel supply system is higher than the fuel demand pressure of the gas turbine, the fuel demand pressure of the gas turbine can be adapted.

In addition, in the fuel supply control device for a gas turbine according to the present invention, when heating and depressurizing the fuel, a heating medium control unit is provided in the heating medium supply system of the heater to set the temperature above the saturation temperature of the fuel itself. Since the flow rate of the heating medium is controlled so that the fuel pressure reduced by the pressure reducing means is not liquefied.

Further, in the fuel supply control device for the gas turbine according to the present invention, when reducing the pressure of the fuel, the fuel control section is provided, the pressure reduction of the fuel by the pressure reducing means is not appropriate, and the fuel pressure is lower than the required fuel pressure of the gas turbine. Even if it is high, the fuel is appropriately treated even if it is high, so that it does not adversely affect the gas turbine.

Further, in the fuel supply control device for the gas turbine according to the present invention, the heater for heating the fuel is provided with the inert gas supply system, and the inert gas control unit is provided.
Since the inert gas sent from the inert gas supply system to the heater is controlled to an appropriate amount while the heater is stopped, reliable rust prevention of the heater can be achieved.

Further, in the fuel supply control device for the gas turbine according to the present invention, the drain controller is provided in the heater for heating the fuel, and the water level of the generated drain is appropriately controlled during the heating of the fuel. It is possible to satisfactorily heat the fuel without an abnormal rise in the drain water level in the heater.

Further, in the fuel supply control device for the gas turbine according to the present invention, the fuel leak emergency processing control unit is provided, and even if there is a fuel leak in the heater during fuel heating, the command of the fuel leak emergency processing control unit is provided. By the fuel source valve of the fuel supply system,
Provide a valve closing signal to each of the heating medium emergency cutoff valve of the heating medium supply system, the drain emergency cutoff valve of the drain system, the vent emergency cutoff valve of the vent system, the inert gas emergency cutoff valve of the inert gas supply system, and the vent Since a non-condensable gas vent relief valve of the system is given a valve open signal to perform appropriate processing, there is no adverse effect on each system.

Further, in the fuel supply control device for the gas turbine according to the present invention, when the fuel is supplied to the gas turbine combustor without supplying the heating medium from the heating medium supply system to the heater, the heater is When the internal pressure of the device becomes negative, the heating medium control unit is provided to supply the heating medium by limiting the valve opening of the heating medium control valve and maintain the internal pressure of the heater above atmospheric pressure. Therefore, it is possible to reliably prevent air from entering the heater.

[Brief description of drawings]

FIG. 1 is a schematic system diagram showing a first embodiment of a fuel supply device for a gas turbine and a control device therefor according to the present invention.

FIG. 2 is a schematic block diagram showing a heating medium control unit in the fuel supply control device for a gas turbine according to the present invention.

FIG. 3 is a schematic block diagram showing a drain control unit of the fuel supply control device for a gas turbine according to the present invention.

FIG. 4 is a schematic block diagram showing an inert gas control unit in the fuel supply control device for a gas turbine according to the present invention.

FIG. 5 is a schematic block diagram showing a pressure reducing means control unit of the fuel supply control device for a gas turbine according to the present invention.

FIG. 6 is a schematic block diagram showing a fuel control unit of the fuel supply control device for a gas turbine according to the present invention.

FIG. 7 is a schematic block diagram showing a fuel leak emergency processing control unit of the gas turbine fuel supply control apparatus according to the present invention.

FIG. 8 is a schematic system diagram showing a second embodiment of a fuel supply device for a gas turbine and a control device therefor according to the present invention.

FIG. 9 is a schematic block diagram showing a heating medium control unit in a second embodiment of the fuel supply device for a gas turbine according to the present invention.

FIG. 10 is a schematic system diagram showing a third embodiment of a fuel supply device for a gas turbine and a control device therefor according to the present invention.

FIG. 11 is a schematic block diagram showing a heating medium control unit in a third embodiment of the fuel supply device for a gas turbine according to the present invention.

FIG. 12 is a schematic diagram showing a conventional embodiment in which a plurality of power plants receives fuel supply from one fuel storage unit.

FIG. 13 is a schematic diagram showing a conventional embodiment in which one power plant receives fuel from one fuel storage unit.

FIG. 14 is a schematic view showing a conventional embodiment in which a booster is provided between a power plant and a fuel storage unit.

[Explanation of symbols]

 1 Fuel Storage Section 2 Fuel Emergency Shutoff Valve 3 Gas Turbine Inlet Fuel Shutoff Valve 4 Fuel Flow Control Valve 5 Gas Turbine Combustor 6 Compressor 7 Gas Turbine 8 Generator 9 Booster 10 Pressure Regulator 11 Pressure Reduction Valve 20 Fuel Supply System 21 Fuel Storage unit 22 Header 23 Gas turbine combustor 24 Fuel source valve 25 Fuel bypass valve 26 Strainer 27 Heater 28 Fuel shutoff valve 29 Large pressure reducing valve 30 Small pressure reducing valve 31 Surge tank 32 Stop valve 33 Fuel emergency relief valve 34 Gas turbine inlet fuel Shutoff valve 35 Gas turbine inlet fuel control valve 36 Heating medium supply system 37 Vent system 38 Inert gas supply system 39 Drain system 40 Heating source 41 Heating medium emergency shutoff valve 42 Heating medium control valve 43 Fuel pressure detector 44 Fuel temperature detector 45 Heating Medium Control Unit 46 Function Unit 47 Comparator 48 Computing Unit 49 Vent Sudden shutoff valve 50 Check valve 51 Orifice 52 Exhaust section 53 Leak fuel detector 54 Non-condensable gas vent relief valve 55 Drain control valve 56 Drain emergency shutoff valve 57 Check valve 58 Drain control section 59 Water level detector 60 Comparator 61 Calculation section 62 Inert gas storage unit 63 Inert gas emergency shutoff valve 64 Inert gas control valve 65 Inert gas control unit 66 Pressure detector 67 Comparator 68 Calculation unit 69 AND circuit 70 Pressure reducing means control unit 71 Fuel control unit 72 Fuel leak Emergency processing control unit 73 Fuel pressure detector 74 Comparator 75 Calculation unit 76 OR circuit 77 Comparator 78 Calculation unit 79 Timer circuit 80 Calculation unit 81 Pressure switch 82 OR circuit 83 Comparator 84 Calculation unit 85 Check valve 90 Given steam Drain water level signal 91 Atmospheric pressure signal 92 Heater operation stop signal 93,94 Gas turbine Fuel demand pressure signal 95 given pressure signal 96 heating medium control unit 97 comparator 98 temperature setter 99 arithmetic unit 100 heating medium control unit 101 pressure detector 102 function unit 102 comparator 104 arithmetic unit 105 valve opening controller 106 pressure setter 107 comparator 108 valve opening calculation unit

Claims (26)

[Claims] 1. A fuel supply system for feeding fuel from a fuel storage section to a plurality of gas turbine combustors, wherein the fuel supply system has a heater for heating the fuel, and the heated fuel is required fuel pressure of the gas turbine. A fuel supply device for a gas turbine, which is provided with a decompression means for decompressing according to the above, and a surge tank for absorbing fluctuations in fuel pressure after decompression. 2. The fuel supply device for a gas turbine according to claim 1, wherein the pressure reducing means is any one of at least one pressure reducing valve and an orifice. 3. The fuel supply for a gas turbine according to claim 2, wherein the pressure reducing valve is divided into a pressure reducing large valve and a pressure reducing small valve, and the pressure reducing large valve and the pressure reducing small valve are installed in parallel. apparatus. 4. The gas turbine according to claim 2, wherein the orifice is divided into a large diameter orifice and a small diameter orifice, and the large diameter orifice and the small diameter orifice are installed in parallel. Fuel supply system. 5. A fuel supply system for feeding fuel from a fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and the heater serves as a fuel heating source. A heating medium supply system that supplies a heating medium, a vent system that discharges the non-condensed gas generated during heating of the fuel to the outside of the device, and a drain system that discharges the drain generated during heating of the fuel to the outside of the device A fuel supply device for a gas turbine, characterized in that each of them is provided. 6. The fuel supply device for a gas turbine according to claim 5, wherein the heating medium supplied to the heater is either steam or hot water. 7. A fuel supply system for feeding fuel in a fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and an inert gas is supplied to the heater when the operation is stopped. A fuel supply device for a gas turbine, which is provided with an inert gas supply system for supplying the gas. 8. The fuel supply device for a gas turbine according to claim 7, wherein the inert gas is one of nitrogen gas and argon gas. 9. A fuel supply system for feeding fuel in a fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and decompression means is provided on the downstream side of the heater. While the gas turbine combustor inlet fuel cutoff valve is provided, the inlet side fuel pressure of the gas turbine combustor inlet fuel cutoff valve is detected, and when the detected pressure is higher than the gas turbine fuel required pressure, A fuel supply control device for a gas turbine, characterized in that a pressure reducing means control section for giving a pressure reducing control signal is provided. 10. The pressure reducing means control section compares a comparator for comparing the fuel pressure signal of the actual inlet side of the fuel cutoff valve at the inlet of the gas turbine combustor with the fuel required pressure signal of the gas turbine, and based on the deviation of this comparator. 10. A structure having a calculating unit for giving a pressure reducing control signal to the pressure reducing means.
A fuel supply control device for a gas turbine according to item 1. 11. A fuel supply system for feeding the fuel in the fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and decompression means is provided on the downstream side of the heater. On the other hand, the heating medium of the heating medium supply system which detects the actual fuel pressure and the actual fuel temperature on the downstream side of the pressure reducing means and supplies the heating medium to the heater based on the detected pressure signal and the detected temperature signal. A fuel supply control device for a gas turbine, characterized in that a heating medium control unit for giving a valve opening / closing signal to the control valve is provided. 12. The heating medium control unit calculates a saturation temperature of the fuel on the basis of the actual fuel pressure signal on the downstream side of the pressure reducing means, and outputs the output signal of the function unit to the downstream side of the pressure reducing means. 12. A structure comprising: a comparator that matches the actual fuel temperature signal detected from the side; and a computing unit that gives a valve opening / closing signal to the heating medium control valve based on the deviation of this comparator. A fuel supply control device for a gas turbine as described above. 13. A fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and a pressure reducing means is provided on the downstream side of the heater. Meanwhile, the actual fuel temperature on the downstream side of the pressure reducing means is detected, and a valve opening / closing signal is sent to the heating medium control valve of the heating medium supply system that supplies the heating medium to the heater based on the detected actual temperature signal. A fuel supply control device for a gas turbine, which is provided with a heating medium control section for giving the heating medium. 14. The heating medium control unit compares a set temperature signal from a temperature setter preset to a real fuel temperature signal on the downstream side of the pressure reducing means with a comparator, and based on a deviation of the comparator. 14. The fuel supply control device for a gas turbine according to claim 13, wherein the heating medium control valve is configured to include a calculation unit that gives a valve opening / closing signal. 15. The fuel supply control of a gas turbine according to claim 14, wherein the set temperature signal of the temperature setter is set higher than the dew point temperature of the fuel corresponding to the fuel supply pressure at the gas turbine inlet. apparatus. 16. A fuel supply system for feeding the fuel in the fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and a pressure reducing means is provided on the downstream side of the heater. On the other hand, the actual fuel pressure on the downstream side of the pressure reducing means, the actual fuel temperature and the actual internal pressure of the heater are respectively detected, and the detected actual fuel pressure signal, the detected actual fuel temperature signal and the internal pressure of the detector are detected. A fuel supply device for a gas turbine, characterized in that a heating medium control unit for providing a valve opening / closing signal to a heating medium control valve of a heating medium supply system for supplying a heating medium to the heater based on a signal is provided. 17. The heating medium control unit calculates a saturation temperature of the fuel based on the actual fuel pressure signal on the downstream side of the pressure reducing means, and outputs the output signal of the function unit to the downstream side of the pressure reducing means. A comparator that matches the actual fuel temperature signal detected from the side, a calculation unit that gives a valve opening / closing signal to the heating medium control valve based on the deviation of this comparator, and a valve opening / closing signal of this calculation unit,
A valve opening limiter for limiting the valve opening degree of the heating medium control valve by adding a valve opening degree limiting signal generated based on the actual pressure signal in the heating device. The fuel supply control device for a gas turbine according to claim 16. 18. The valve opening limit signal of the valve opening limiter is a deviation signal obtained by comparing the actual internal pressure of the heater with a set pressure signal from a pressure setter preset to atmospheric pressure or higher. The fuel supply control device for a gas turbine according to claim 17, wherein the fuel supply control device is produced based on 19. A fuel supply system for feeding fuel in a fuel storage section to a gas turbine combustor, a heater for heating the fuel is provided in the fuel supply system, and a pressure reducing valve is provided on the downstream side of the heater. On the other hand, one of the actual fuel pressure on the downstream side of the pressure reducing valve or the actual fuel pressure on the actual inlet side of the gas turbine combustor inlet fuel cutoff valve provided on the inlet side of the gas turbine combustor is provided. When the detected pressure is higher than the fuel pressure required for the gas turbine, a valve open signal is given to the fuel emergency relief valve provided on the inlet side of the gas turbine combustor inlet fuel cutoff valve, and conversely the detected pressure is detected. Is lower than the fuel required pressure of the gas turbine, a valve closing signal is given to the fuel emergency relief valve, and the detected pressure continues to be higher than the fuel required pressure of the gas turbine even after opening and closing the valve of the fuel emergency relief valve. A fuel supply control device for a gas turbine, characterized in that a fuel control unit is provided for giving a valve closing signal to a fuel cutoff valve provided between the heater and the pressure reducing valve when the temperature is high. 20. The fuel control unit projects either the actual fuel pressure signal on the downstream side of the pressure reducing valve or the actual fuel pressure signal on the actual inlet side of the gas turbine inlet fuel cutoff valve to the fuel demand pressure signal of the gas turbine. A comparator for matching, a calculation unit for giving a valve opening / closing signal to the fuel emergency relief valve based on the deviation of this comparator, and the actual fuel pressure signal even after the valve of the fuel emergency relief valve is opened is the fuel required pressure of the gas turbine. 20. The fuel supply control device for a gas turbine according to claim 19, wherein the fuel supply control device for a gas turbine according to claim 19, further comprising an arithmetic unit that gives a valve closing signal to the fuel cutoff valve via a timer circuit when the fuel supply is higher than the above. 21. A fuel supply system for sending fuel from a fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and the heater is inert while the heater is not operating. When an inert gas supply system for supplying gas is installed, and the internal pressure of the heater becomes below atmospheric pressure in the inert gas emergency shutoff valve and the inert gas control valve installed in this inert gas supply system. A fuel supply control device for a gas turbine, characterized in that an inert gas control section for giving a valve opening signal is provided. 22. The inert gas control unit detects the internal pressure of the heater and compares the internal pressure signal of the detector with the atmospheric pressure signal, and the internal pressure signal of the detector is the atmospheric pressure signal. And a zero deviation or a negative deviation, a calculation unit that generates a valve opening signal for the inert gas emergency shutoff valve and the inert gas control valve, a valve opening signal for this calculation unit, and a signal for stopping the operation of the heater. 22. The fuel supply for a gas turbine according to claim 21, further comprising: an AND circuit for giving a valve opening signal to the inert gas emergency cutoff valve and the inert gas control valve on condition that all of the above conditions are met. Control device. 23. A fuel supply system for feeding the fuel in the fuel storage section to a plurality of gas turbine combustors, a heater for heating the fuel is provided in the fuel supply system, and a heating medium supply provided in the heater. When the drain generated during heat exchange between the heating medium from the system and the fuel from the fuel storage exceeds a given water level, a valve opening / closing signal is given to the drain control valve of the drain system provided in the heater. A fuel supply control device for a gas turbine, comprising a drain control unit. 24. The drain control unit detects a water level in the heater and compares the water level signal in the detector with a given value, and a drain control valve based on a deviation of the comparator. 24. The fuel supply control device for a gas turbine according to claim 23, wherein the fuel supply control device is configured to include a calculation unit that gives an opening / closing signal. 25. A fuel supply system for sending fuel in a fuel storage section to a gas turbine combustor is provided, and a heater for heating the fuel is provided in the fuel supply system, and the heater serves as a fuel heating source. A heating medium supply system that supplies a heating medium and a vent system that releases the non-condensed gas that is generated during heating of the fuel to the outside of the device, and a drain system that drains the drain that is generated during heating of the fuel to the outside of the device, While the operation of the heater is stopped, while an inert gas supply system for supplying an inert gas is provided, during heat exchange between the fuel and the heating medium, the fuel leak detector and the heater provided in the vent system are provided. When either one of the pressure switches provided detects a fuel leak inside the container,
Fuel source valve provided in the fuel supply system, heating medium emergency cutoff valve provided in the heating medium supply system, drain emergency cutoff valve provided in the drain system, vent emergency cutoff valve provided in the vent system, the inert In addition to providing a valve closing signal to each of the inert gas emergency shutoff valves provided in the gas supply system, a fuel leak emergency processing control unit that provides a valve opening signal to the noncondensable gas vent relief valve provided in the vent system is provided. A characteristic gas turbine fuel supply control device. 26. The fuel leak emergency processing control unit detects the leak fuel pressure of the vent system or the internal pressure of the heater,
A comparator that matches either detection signal to a given pressure, and based on the deviation of this comparator, the fuel source valve, heating medium emergency cutoff valve, drain emergency cutoff valve, vent emergency cutoff valve, inert gas emergency cutoff 26. The fuel supply control device for a gas turbine according to claim 25, further comprising: a calculation unit that gives a valve closing signal to the valve and gives a valve opening signal to the non-condensed gas vent relief valve.