JP3848850B2 - Gas turbine having a fuel flow control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas turbine having a fuel flow rate control device, and more particularly to a fuel flow rate control device for a gas turbine capable of simplifying the configuration of a fuel supply path.
[0002]
[Prior art]
A gas turbine mixes and burns compressed air and fuel, supplies high-temperature and high-pressure combustion gas obtained by the combustion to the turbine, and rotates the turbine by the thrust of the combustion gas. Such a gas turbine is used, for example, to generate a certain amount of electric power by rotating a power generator. Therefore, a general gas turbine is provided with a plurality of combustors, and a fuel supply passage for supplying fuel to each combustor is provided.
[0003]
FIG. 8 is a schematic configuration diagram of a conventional gas turbine. In the gas turbine, the air compressed by the compressor 4 and the fuel supplied from the fuel supply path 100 are mixed and burned by the combustor 5, and the high-temperature and high-pressure combustion gas generated thereby is the moving blades of the turbine. 6 is rotated. In detail, the fuel supply path 100 includes a pilot fuel supply path and a main fuel supply path, and a required amount of heat is generated in the combustor 5 mainly by controlling the flow rate of the main fuel supply path.
[0004]
The fuel supply path 100 is provided with a pressure control valve (hereinafter referred to as a pressure control valve) 18 and a flow rate control valve (hereinafter referred to as a flow control valve) 19, and the flow control valve 19 is provided with a differential pressure gauge 30. The amount of heat necessary to generate the necessary output is obtained, and control is performed so that fuel necessary for generating the amount of heat in the combustor 5 is supplied to the combustor 5. In order to control the flow rate of the supplied fuel, it is necessary to appropriately control the valve opening degree and the differential pressure of the flow regulating valve 19. For example, in the case of non-expandable liquid fuel, the flow rate value Q controlled by the flow control valve 19 is the next between the CV value corresponding to the valve opening of the flow control valve 19 and its differential pressure ΔP. There is a relationship.
[0005]
Q = k · CV · √ΔP
Therefore, the CV value corresponding to the valve opening for obtaining the required amount of heat is
CV = kQ / √ΔP
Is required. Here, k is a constant.
[0006]
In the conventional control method, the input / output differential pressure ΔP of the flow control valve 19 is kept constant, and the CV value necessary for the target flow rate is obtained based on the reference differential pressure ΔPs. That is, as shown in FIG. 8, the differential pressure 20 of the flow control valve 19 is compared with the set differential pressure 21 by the difference generator 22, and the differential pressure control signal 16 corresponding to the difference is amplified by the amplifier 23, The valve opening degree of the valve control 18 is controlled. Therefore, by controlling the valve opening degree of the pressure regulating valve 18, the input pressure Pin of the flow regulating valve 19 is appropriately controlled, and the differential pressure ΔP of the flow regulating valve 19 is maintained at the reference differential pressure ΔPs.
[0007]
As a result, the CV value for obtaining the necessary heat quantity Q is uniquely determined by the above formula. Therefore, as shown in FIG. 8, the fuel control device 15 converts the required heat amount 24 corresponding to the required output into the required flow rate 26 by the heat amount / flow rate conversion unit 25, and further, the inherent characteristics of the flow control valve 19. Accordingly, the CV value 28 at the reference differential pressure ΔPs is obtained by the flow rate / CV value conversion unit 27. Since the CV value corresponds to the valve opening, the CV value / valve opening converting unit 29 converts the CV value 28 into the valve opening, and the corresponding opening command signal 17 is supplied to the flow control valve 19. . As a result, the valve opening degree of the flow control valve 19 is controlled so that a fuel flow rate necessary for obtaining a necessary amount of heat can be obtained.
[0008]
[Problems to be solved by the invention]
In the above conventional example, the flow control device 15 maintains the differential pressure ΔP of the flow regulating valve 19 at a predetermined reference value ΔPs in order to obtain the valve opening (CV value) for obtaining the necessary flow Q. Thus, only the flow rate Q is set as the variation factor for obtaining the CV value. As a result, the pressure difference before and after the flow control valve 19 is kept constant, the CV value corresponding to the valve opening is uniquely determined from the required flow rate Q, and the valve opening of the flow control valve 19 is controlled.
[0009]
However, in the gas turbine, a plurality of combustors are installed around the turbine, and the fuel supply path 100 shown in FIG. 8 is provided in each fuel device. Therefore, the cost increase of the gas turbine as a whole by the fuel supply path 100 is so large that it cannot be ignored, which causes an increase in the cost of the gas turbine.
[0010]
Further, in order to keep the differential pressure ΔP constant, a pressure increasing device for increasing the pressure of the supplied fuel is provided in front of the pressure regulating valve 18. Then, the pressure of the boosted fuel is reduced to a constant pressure by the pressure regulating valve 18 and is controlled so as to keep the differential pressure ΔP of the flow regulating valve constant. Therefore, the boosting equipment (not shown) is caused by the cost increase of the gas turbine.
[0011]
Accordingly, an object of the present invention is to provide a gas turbine having a fuel flow rate control device corresponding to the simplified fuel supply path.
[0012]
Furthermore, another object of the present invention is to provide a gas turbine having a fuel flow rate control device capable of simplifying the structure of the fuel supply path and correspondingly supplying a stable fuel flow rate and responding to sudden changes in operating conditions. is there.
[0013]
[Means for Solving the Problems]
To achieve the above object, the present onset Ming, in a gas turbine to rotate the turbine by the combustion gas by burning fuel supply, and flow rate control valve for adjusting the flow rate of the fuel, an inlet of the flow amount control valve A fuel supply path having a differential pressure gauge for measuring the differential pressure at the outlet, a cabin pressure gauge for measuring the cabin pressure, a supply pressure gauge for measuring an inlet pressure to the flow control valve, and an outlet pressure of the flow control valve A pressure gauge for measuring fuel pressure, a fuel thermometer for measuring fuel temperature, a high-frequency filter for removing high-frequency components of differential pressure data detected by the differential pressure gauge, a required flow rate corresponding to a required output, and the differential pressure data A CV value generator for generating a CV value corresponding to the valve opening of the flow control valve for obtaining a required amount of heat; and a valve opening command corresponding to the generated CV value is supplied to the flow control valve CV value and valve opening change The high frequency filter responds to the cabin pressure from the cabin pressure gauge, and acts to remove a high frequency component of the differential pressure data when the gas turbine is in a steady state. In an abnormal state, the removal function is canceled and differential pressure data is supplied to the CV value generation unit, and the CV value generation unit adds the necessary flow rate and the differential pressure data to the inlet from the supply pressure gauge. The CV value is generated according to pressure, the outlet pressure from the pressure gauge, and the fuel temperature from a fuel thermometer.
That is, a high-frequency filter, a CV value generation unit, and a CV value that remove the pressure control valve from the fuel supply passage of the gas turbine and control the valve opening degree of the flow rate control valve so as to reach a target flow rate while monitoring the differential pressure. -A fuel flow control device consisting of a valve opening conversion unit is provided. Then, by supplying the output of the differential pressure gauge to the CV value generation unit of the fuel flow control device via the high frequency filter, the fluctuation of the pressure before and after the flow control valve due to the removal of the pressure control valve is Do not affect the control.
[0014]
With the removal of the pressure regulating valve that keeps the differential pressure of the conventional flow rate regulating valve constant, the flow regulating valve differential pressure slightly fluctuates even when the gas turbine is in a steady state. If the valve opening degree of the flow rate control valve is controlled in response to the change in the differential pressure, the fuel flow rate changes unnecessarily, resulting in a change in the output of the gas turbine. Therefore, in a steady state, the fluctuation of the flow control valve differential pressure is removed by the high frequency filter, and the flow control valve differential pressure from which the noise has been removed is given to the CV value generation unit of the fuel flow control device. Therefore, the fuel flow control device controls the valve opening degree of the flow control valve according to the required flow rate value and the flow control valve differential pressure from which noise is removed, thereby enabling stable flow control and gas turbine output. .
[0015]
Then, a sudden change in or pressure after the flow regulation valve, when an abnormal condition such as an abrupt change in the output command is, CV value generation of the fuel flow control device the flow regulation valve differential pressure data without using the high-frequency filter Supply to the department . For example, when a load interruption occurs in a load such as a power generator connected to a gas turbine, the rotation of the turbine becomes overspeed, and the flow control valve opening is rapidly throttled by the function of the flow control device. The flow rate is rapidly reduced. This change causes a rapid decrease in fuel gas and is detected as a rapid change in turbine casing pressure. Therefore, when this sudden change in the passenger compartment pressure is detected, the high frequency filter is deactivated. Alternatively, when a command for intentionally reducing the gas turbine output is intentionally issued, the high-frequency filter may be deactivated without waiting for a change in the passenger compartment pressure.
[0016]
By supplying the flow control valve differential pressure to the flow control device without going through a high-frequency filter in an abnormal state, a rapid change in the flow control valve differential pressure is reflected in the flow control, and fuel flow control with good responsiveness is achieved. Can be possible.
[0018]
Furthermore, according to a more preferred embodiment, the CV value generation unit generates a reference CV value of the flow rate control valve according to the required flow rate and a predetermined reference differential pressure, and the reference the CV value is corrected in response to the differential pressure data and said Rukoto to have a the CV value correction unit which generates the CV value.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention.
[0020]
FIG. 1 is a configuration diagram of a gas turbine in the present embodiment. In the gas turbine, a rotor 3 which is a rotating part is supported via a bearing 2. The air compressed by the left compressor 4 and the fuel (gas or oil) supplied to the central combustor 5 are mixed and burned in the combustor 5. Then, the high-temperature and high-pressure combustion gas generated by the combustion is supplied to the right turbine, and the turbine rotor blade is rotated by the thrust. Accordingly, a plurality of combustors 5 are provided around the rotor. The rotation of the turbine is used as power for the generator, for example. Moreover, although it is a gas turbine, incompressible liquid fuels, such as oil, are utilized for fuel other than compressible gaseous fuels, such as gas. The pressure in the turbine to which the fuel gas is supplied is the casing pressure.
[0021]
FIG. 2 is a diagram illustrating a configuration example of the combustor 5. The combustor 5 includes a main nozzle and a pilot nozzle 10 to which main fuel premixed with air and pilot fuel not premixed are supplied, and compressed air to which compressed air mixed with the main fuel is supplied from a compressor. It has a discharge port 14, a combustor inner cylinder 11 in which a flame is generated by combustion, a combustor outer cylinder 12 that sends combustion gas to a turbine, and a bypass valve 13.
[0022]
FIG. 3 is a diagram showing the configuration of the fuel supply path and the flow rate control device of the gas turbine in the present embodiment. The fuel supply passage 100 in the present embodiment is not provided with the conventional pressure regulating valve. The fuel supply path 100 is provided with a flow rate adjustment valve (flow control valve) 42 for controlling the fuel flow rate, and a supply pressure gauge 43 for measuring the supply pressure (inlet pressure) Pin and a fuel temperature t at the front stage of the supply path. A fuel thermometer 44 for measurement is provided. Furthermore, a pressure gauge 46 for measuring the post-flow control pressure (outlet pressure) Pout is provided at the subsequent stage of the flow control valve 42.
[0023]
Supply pressure Pin, fuel temperature t, flow control differential pressure ΔP, post- flow control pressure Pout, and casing pressure Pt of the gas turbine detected by each sensor are supplied to the fuel flow control device 30.
[0024]
The fuel flow rate control device 30 includes a heat quantity / flow rate conversion unit 32 that converts a required heat quantity 31 corresponding to a target gas turbine output into a required fuel flow quantity 33, and a CV value generation that generates a CV value corresponding to the required flow quantity. 36A and a CV value / valve opening degree conversion unit 38 for converting the generated CV value 37 into a valve opening degree. Along with the fact that no pressure regulating valve is provided in the fuel supply path 100, a difference generating unit and an amplifying unit for controlling the pressure regulating valve are not provided. In addition, no boosting equipment is provided for pressure regulation.
[0025]
The CV value generation unit 36A can directly obtain the CV value 37 from the required flow rate 33 and the sensor values Pin, t, ΔP, and Pout according to a mathematical expression described later. Alternatively, as in the conventional example, the CV value generation unit 36A obtains the CV value 36 from the required flow rate 33 on the assumption of the reference differential pressure ΔPs by the flow rate / CV value conversion unit 34, and the CV value 36 is obtained as a CV value correction unit. 36 can also be corrected according to the reference differential pressure ΔPs and the sensor values Pin, ΔP. In any method, the CV value 37 corresponding to the opening degree command 41 to the flow control valve 42 can be obtained.
[0026]
The flow adjustment valve differential pressure ΔP and the flow adjustment post-pressure Pout are supplied to the CV value generation unit 36A via the high frequency filters 39 and 40, respectively. High-frequency filter 39 and 40 has a function of removing sudden changes in the flow regulation valve differential pressure ΔP and flow regulation valve after pressure Pout. Accordingly, in the gas turbine steady state, high frequency filter 39 and 40, removes the sudden change in the flow regulation valve differential pressure ΔP and flow regulation valve after pressure Pout, their low frequency components (or average value) CV The value is supplied to the value generator 36A. Accordingly, the CV value generation unit 36A generates a CV value corresponding to the required flow rate Q by following a large change in the low frequency component without following a slight change in the high frequency component of the differential pressure ΔP or the post pressure Pout. can do. As a result, the fuel flow rate is also controlled without following the high frequency component, and the output of the gas turbine is prevented from unnecessarily fluctuating. When the gas turbine rotates the generator, the rotation of the turbine becomes more stable and the power quality can be kept high.
[0027]
The high frequency filters 39 and 40 are stopped in function in response to a sudden change in the cabin pressure Pt of the cabin pressure gauge 48 that measures the cabin pressure in which the turbine blade 6 of the gas turbine is housed. The valve adjustment differential pressure ΔP and the flow adjustment post-pressure Pout are directly supplied to the CV value generation unit 36A. Alternatively, the functions of the high frequency filters 39 and 40 are stopped in response to a sudden change in a gas turbine output command (not shown).
[0028]
High-frequency filter, so to remove the sudden changes in the flow regulation valve differential pressure ΔP and flow regulation valve after pressure Pout, but works effectively in the steady state of the gas turbine, or above the cabin pressure Pt decreases abruptly If the output command of the gas turbine decreases suddenly, it is necessary to squeeze the fuel flow quickly for some reason. In this case, the function of the high-frequency filter is stopped and the flow control valve differential pressure ΔP and the flow rate are reduced. An abrupt change in post-validation pressure Pout is directly supplied to the CV value generation unit 36A. As a result, the valve opening degree of the flow control valve 42 can be reduced with good responsiveness.
[0029]
For example, assume that a load interruption occurs in the gas turbine due to some disturbance. As a result, the gas turbine enters an overspeed state. Such an overspeed condition may lead to a trip such as off-axis of the turbine, so it is necessary to immediately reduce the fuel flow rate. In an overspeed state, the required heat amount is reduced by a signal from the turbine side, the opening of the flow regulating valve 42 is throttled by the operation of the fuel flow control device 30, the combustion gas is reduced, and the passenger compartment pressure is reduced. When the function of the high-frequency filter is stopped in response to the sudden decrease in the cabin pressure, the differential pressure ΔP of the flow regulating valve 42 that suddenly increased as a result of the valve opening being reduced, or the flow regulation that has suddenly decreased. The post-valve pressure Pout is directly applied to the CV value generation unit 36A. As will be apparent from the calculation formula described later, the rapid increase in the differential pressure ΔP is accompanied by a rapid decrease in the CV value, and the valve opening degree of the flow control valve 42 is further reduced to prevent overspeed.
[0030]
Similarly, when the output command of the gas turbine suddenly fluctuates for some reason, the valve opening degree can be suddenly changed in response to the rapid change by similarly stopping the function of the high frequency filter.
[0031]
Thus, when the gas turbine is in an abnormal state, the function of the high-frequency filter is removed, and changes in the flow valve differential pressure ΔP and the flow valve post-pressure Pout are directly applied to the fuel flow control device 30. It is effective for the gas turbine to control the flow rate with good responsiveness. However, in a steady state, the high-frequency filter removes a steep change in the flow valve differential pressure ΔP and the flow valve post-pressure Pout, and the CV value is controlled mainly corresponding to the required flow rate Q.
[0032]
FIG. 4 is a diagram illustrating a CV value generation unit in the case of liquid fuel. In the case of fluid fuel such as oil, since it is non-expandable, the CV value can be obtained from the required flow rate Q and the differential pressure ΔP of the flow control valve 42. The calculation formula is as shown in FIG. Here, K is a constant. When the CV value is generated according to this calculation formula, the CV value increases as the required flow rate Q increases, and the CV value decreases because the supply flow rate increases even at the same valve opening when the flow control valve differential pressure ΔP increases. To be controlled.
[0033]
The flow control valve differential pressure ΔP is supplied to the CV value generation unit 36A via the high frequency filter 39 as described above. When the turbine casing pressure Pt detected by the casing pressure gauge 48 fluctuates within a certain range, it is determined as a steady state, and the high frequency filter 39 acts to remove the high frequency component of the differential pressure ΔP. If the passenger compartment pressure Pt fluctuates rapidly, it is determined as an abnormal state, the filter function of the high frequency filter 39 is stopped, and the output ΔP of the differential pressure gauge 45 is supplied directly to the CV value generation unit 36A.
[0034]
As is clear from this calculation formula, when the flow control valve differential pressure ΔP suddenly increases due to load interruption or the like, if the differential pressure ΔP is directly supplied to the CV value generation unit 36A without passing through the high frequency filter 39, the CV value is Decreases rapidly. As a result, the valve opening degree of the flow control valve 42 is rapidly reduced, and the overspeed phenomenon of the turbine accompanying the load interruption can be prevented.
[0035]
FIG. 5 is a diagram showing another CV value generation unit in the case of liquid fuel. In this example, similarly to the conventional example, the flow rate / CV value conversion unit 3 obtains the CV value under the predetermined reference differential pressure ΔPs from the required flow rate 33. The obtained CV value CVs is corrected by the CV value correction unit 36 according to the measured differential pressure ΔP.
[0036]
As is apparent from the calculation formula for generating the CV value in FIG. 4, the CV value is inversely proportional to the square root of the differential pressure ΔP. Therefore, the corrected CV value 37 is obtained by dividing the CV value CVs obtained from the reference differential pressure ΔPs by the square root of the ratio of the actual differential pressure ΔP and the reference differential pressure ΔPs.
[0037]
In the example of FIG. 5 as well, the function of the high frequency filter 39 is controlled in accordance with the cabin pressure Pt detected by the cabin pressure gauge 48. The steady state high frequency filter 39 acts, the function of high frequency filter 39 is in an abnormal state, such as Kurumashitsu圧Pt decreases rapidly becomes inactive, the differential pressure ΔP is directly CV value correction differential pressure gauge 45 detects Given to part 36.
[0038]
FIG. 6 is a diagram illustrating a CV value generation unit in the case of gaseous fuel. In the case of gaseous fuel, since the gaseous fuel is compressible, its density varies depending on the temperature. Therefore, in order to obtain the CV value, it is necessary to consider a variable obtained by multiplying the specific gravity γ of the fuel by the absolute temperature (t + 273). In other words, if the temperature is high, the gas fuel expands and the density becomes thin, so it is necessary to increase the valve opening. Conversely, if the temperature is low, the gaseous fuel contracts and the density increases, so the valve opening needs to be made smaller. Further, when the supply pressure Pin increases, the fuel density increases, so it is necessary to decrease the CV value. Conversely, when the supply pressure Pin decreases, the fuel density decreases and the CV value needs to be increased.
[0039]
Further, the CV value is calculated differently depending on whether the flow regulating valve 42 is choked (differential pressure is large) or not choked (differential pressure is small). This is because, during choke, the supply pressure Pin is large and the supplied fuel is compressed, and the post-flow-regulation pressure Pout is small, so that the flow rate is not easily affected by fluctuations in the differential pressure ΔP. On the other hand, when there is no choke, this is not the case, and the flow rate is affected by fluctuations in the differential pressure ΔP.
[0040]
Therefore, the CV value generation unit 36A has different calculation formulas for generating the CV value when choked and when not choked. In general, it is known at the design stage whether the flow regulating valve 42 is used in a choked state or a non-choke state. Therefore, each calculation formula can be determined at the design stage.
[0041]
The calculation formula of the CV value shown in FIG. 6 is, for example, in “Basics and Applications of Digital Instrumentation Control System, Industrial Technology Company, Kazuo Hiroi (ISBN-905957-00-1 C3055 P4120E), pp. 174-175” Is also shown.
[0042]
In the embodiment of FIG. 6, the flow control valve differential pressure ΔP and the flow control post-pressure Pout are supplied to the CV value generation unit 36 </ b> A via the high frequency filters 39 and 40. These high frequency filters remove the high frequency in the steady state and stop the high frequency removal function in the abnormal state according to the change in the output Pt of the cabin pressure gauge 48. The accompanying action is as described above. In the example of FIG. 6, in the case of the flow control valve used in the choke state, since the change in the differential pressure ΔP is not reflected in the CV value, the presence of the high frequency filter is meaningless, but the flow control valve used in the non-choke state In the case of a valve, the CV value changes depending on the differential pressure ΔP and the post pressure Pout. Therefore, when the high frequency filter is removed, the responsiveness increases.
[0043]
FIG. 7 is a diagram showing another CV value generation unit in the case of gaseous fuel. In the CV value generation unit 36A, as in the case of FIG. 5, the flow rate / CV value conversion unit 34 first obtains the CV value CVs with respect to the required flow rate 33 on the assumption of the reference differential pressure ΔPs. In order to obtain the CV value, different calculation formulas are used for choke and non-choke shown in FIG. Accordingly, the output of each sensor is supplied to the flow rate / CV value conversion unit 34.
[0044]
The CV value generation unit 36A further includes a CV value correction unit 36 that corrects the CV value CVs once obtained according to the supply pressure Pin and the differential pressure ΔP. The correction calculation formula shown in FIG. 7 is obtained by calculation for removing the term of temperature t from the calculation formula shown in FIG. Since this correction arithmetic expression is not an essential part of the present embodiment, a detailed description thereof will not be made. However, in detail, “the combustion apparatus of the gas turbine and the fuel of the gas turbine, separately filed by the present applicant”. Supplying method "(Japanese Patent Application No. 2000-151038).
[0045]
In this correction formula, the correction value at the time of choke of fuel gas = √ {Pin ² / (Pin−ΔP + CV value) ² +1} and the correction value at the time of non-choke = √ {(2 × Pin × ΔP−ΔP ² ) / Flow control valve reference differential pressure (2PinΔP + flow control valve reference differential pressure)}. Here, the supply pressure Pin and the differential pressure ΔP are used for the correction calculation as process values. The differential pressure ΔP is supplied to the CV value correction unit 36 via the high frequency filter 39 that is controlled in accordance with the change in the passenger compartment pressure Pt as described above.
[0046]
As described above, the protection scope of the present invention is not limited to the above-described embodiment, but extends to the invention described in the claims and equivalents thereof.
[0047]
【The invention's effect】
As described above, according to the present invention, the pressure control valve is removed from the fuel supply path of the gas turbine, and the CV value corresponding to the valve opening degree of the flow rate control valve is generated according to the differential pressure between the required fuel and the flow rate control valve. Since the valve opening degree is controlled, the cost of the gas turbine can be reduced. Furthermore, the high frequency component of the differential pressure of the flow control valve opening, which is a parameter necessary for generating the CV value, is removed in the steady state and not removed in the abnormal state. It is possible to stabilize the fuel flow control and to speed up the response of the fuel flow control in an abnormal state.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a gas turbine in an embodiment.
FIG. 2 is a diagram showing a configuration example of a combustor 5;
FIG. 3 is a diagram showing a configuration of a fuel supply path and a flow rate control device of a gas turbine in the present embodiment.
FIG. 4 is a diagram illustrating a CV value generation unit in the case of liquid fuel.
FIG. 5 is a diagram showing another CV value generation unit in the case of liquid fuel.
FIG. 6 is a diagram showing a CV value generation unit in the case of gaseous fuel.
FIG. 7 is a diagram showing another CV value generation unit in the case of gaseous fuel.
FIG. 8 is a schematic configuration diagram of a conventional gas turbine.
[Explanation of symbols]
30 Fuel flow control device 39 High frequency filter 42 Flow control valve 45 Differential pressure gauge

Claims (2)

In a gas turbine that burns supplied fuel and rotates the turbine with combustion gas,
A fuel supply path having a flow rate adjusting valve for adjusting the flow rate of the fuel, and a differential pressure gauge for measuring a differential pressure between an inlet and an outlet of the flow rate adjusting valve;
A cabin pressure gauge for measuring the cabin pressure ;
A supply pressure gauge for measuring an inlet pressure to the flow control valve;
A pressure gauge for measuring the outlet pressure of the flow control valve;
A fuel thermometer for measuring the fuel temperature;
A high frequency filter for removing high frequency components of differential pressure data detected by the differential pressure gauge;
Accordance with the required flow rate corresponding to the required output and the differential pressure data, and CV value generator for generating a CV value corresponding to the valve opening degree of the flow control valve to obtain the amount of heat required,
A CV value / valve opening degree conversion unit for supplying a valve opening degree command corresponding to the generated CV value to the flow rate control valve;
The high frequency filter in response to the cabin pressure from the cabin pressure gauge, when the gas turbine is in steady state, and acts to remove high-frequency components of the differential pressure data, when the gas turbine is in an abnormal state, Cancel the removal function and supply the differential pressure data to the CV value generator ,
The CV value generation unit, in addition to the required flow rate and the differential pressure data, according to the inlet pressure from the supply pressure gauge, the outlet pressure from the pressure gauge, and the fuel temperature from a fuel thermometer, A gas turbine that generates the CV value . Oite to claim 1, wherein the CV value generating unit includes a flow rate · CV value conversion unit for generating a reference CV value of the flow rate control valve in accordance with a predetermined reference pressure difference between the required flow rate, the reference CV value A gas turbine comprising: a CV value correcting unit that generates the CV value by correcting the differential pressure data according to the differential pressure data .

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