JP2023132696A - Electric power generation plant, steam cooling system and control device and control method therefor - Google Patents

Abstract

To control a cooling water flow volume to a proper range.SOLUTION: A steam cooling system comprises a first adjusting valve for adjusting the flow volume of cooling water to be supplied from a cooling tower to a condenser, and a second adjusting valve for adjusting the flow volume of warm water to be supplied from the condenser to the cooling tower. A control device comprises a measurement value acquisition portion 51 acquiring a measurement value of a parameter related to the steam cooling system including differential pressure ΔPcg between atmospheric pressure and condenser pressure which is pressure of an internal space of the condenser, and a calculation portion 52 calculating the opening Z1 of the first adjusting valve on the basis of information for calculating the opening Z1 of the first adjusting valve, wherein the opening Z2 of the second adjusting valve is a target value of the opening Z1, from the parameter related to the steam cooling system, and the measurement value acquired by the measurement value acquisition portion 51.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a power plant, a steam cooling system, and a control device and control method thereof.

The flash method is known as a method for geothermal power generation plants. The flash method is a method for generating electricity by directly supplying steam separated from geothermal fluid obtained from a production well to a turbine. Flash-type geothermal power plants use a condenser that sprays cooling water directly into the turbine exhaust gas, condensing the steam that has worked in the turbine and turning it into hot water, and a condenser that uses air, etc., to supply the heat. It is equipped with a cooling tower that turns hot water into cooling water, and water circulates in a circulation system that includes a condenser and a cooling tower. Since the pressure in the internal space of the condenser (hereinafter referred to as "condenser pressure") is lower than the pressure in the internal space of the cooling tower, cooling water is supplied from the cooling tower to the condenser due to the pressure difference. be done. Conventionally, for example, a condenser is adjusted to a vacuum state, and the pressure in the internal space of a cooling tower is set to atmospheric pressure (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Publication No. 2015-108476 Japanese Patent Application Publication No. 2021-134779

By the way, when the temperature of the cooling water supplied to the condenser changes due to temperature differences between day and night or between seasons, the condenser pressure also changes accordingly. Atmospheric pressure also changes over time. Due to these factors, the pressure difference between the condenser pressure and atmospheric pressure (hereinafter referred to as "vacuum differential pressure") changes. If the vacuum differential pressure is large, the force of drawing cooling water from the cooling tower to the condenser increases, and the flow rate of cooling water increases. Conversely, if the vacuum differential pressure is small, the power to draw cooling water from the cooling tower to the condenser will be reduced, resulting in a decrease in the flow rate of cooling water.

On the other hand, the condenser pressure affects the turbine output (in a geothermal power plant, the amount of power generated by the generator driven by the turbine). For this reason, for example, when the temperature is high, the condenser pressure increases and the pressure difference between the inlet and outlet of the turbine decreases, resulting in a decrease in turbine output. Conversely, when the temperature is low, the pressure difference between the inlet and outlet of the turbine increases as the condenser pressure decreases, resulting in an increase in turbine output.

Furthermore, according to the above mechanism, when the condenser pressure increases, the vacuum differential pressure decreases, so the amount of cooling water supplied to the condenser decreases, and the cooling capacity of the condenser decreases. This results in a further increase in water pressure (further decrease in turbine output).

The present disclosure has been made in view of these circumstances, and provides a power generation plant, a steam cooling system, a control device thereof, and a control method thereof, which can suppress the effects of changes in the external environment such as temperature, atmospheric pressure, and humidity. The purpose is to provide

A first aspect of the present disclosure includes a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; and a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the condenser to the cooling tower. A control device for a steam cooling system, comprising a second adjustment section for adjusting a pressure difference between atmospheric pressure and a condenser pressure that is a pressure in an internal space of the condenser. a measured value acquisition unit that acquires a measured value of a parameter related to the steam cooling system; and information for calculating an operation amount of the first adjustment unit with the operation amount of the second adjustment unit as a target value from the parameter regarding the steam cooling system; The control device includes a calculation unit that calculates an operation amount of the first adjustment unit based on the measurement value acquired by the measurement value acquisition unit.

A second aspect of the present disclosure includes a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; A control device for a steam cooling system, comprising a second adjustment section for adjusting a pressure difference between atmospheric pressure and a condenser pressure that is a pressure in an internal space of the condenser. a measured value acquisition unit that acquires a measured value of a parameter related to the steam cooling system; information for calculating an operation amount of the first adjustment unit that sets the flow rate of the cooling medium as a target value from the parameter related to the steam cooling system; and the measured value The control device includes a calculation unit that calculates an operation amount of the first adjustment unit based on the measurement value acquired by the acquisition unit.

A third aspect of the present disclosure includes a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; A steam cooling system including a second adjustment section for adjustment and the control device described above.

A fourth aspect of the present disclosure is a power generation plant including a turbine, a power generator that generates power using the driving force of the turbine, and the steam cooling system.

A fifth aspect of the present disclosure includes a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; A method for controlling a steam cooling system comprising: a second adjustment section for adjusting a pressure difference between atmospheric pressure and a condenser pressure that is a pressure in an internal space of the condenser; information for calculating the operation amount of the first adjustment section with the operation amount of the second adjustment section as a target value from the parameter regarding the steam cooling system; In this control method, a computer executes a step of calculating an operation amount of the first adjustment section based on the measured value.

A sixth aspect of the present disclosure includes a first adjustment unit for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; A method for controlling a steam cooling system comprising: a second adjustment section for adjusting a pressure difference between atmospheric pressure and a condenser pressure that is a pressure in an internal space of the condenser; information for calculating the manipulated variable of the first adjustment unit with the flow rate of the cooling medium as a target value from the parameter related to the steam cooling system; and the obtained measured value. This is a control method in which a computer executes a step of calculating an operation amount of the first adjustment section based on.

A seventh aspect of the present disclosure is a program for causing a computer to function as the control device.

According to the present disclosure, it is possible to suppress the effects of changes in the external environment such as temperature, atmospheric pressure, and humidity.

1 is a schematic configuration diagram schematically showing the configuration of a geothermal power generation plant according to a first embodiment of the present disclosure. FIG. 1 is a diagram showing an example of the hardware configuration of a control device according to a first embodiment of the present disclosure. FIG. 2 is a functional block diagram showing an example of functions included in a control device according to a first embodiment of the present disclosure. FIG. 2 is a functional block diagram showing an example of functions provided in a first regulating valve control section according to a first embodiment of the present disclosure. FIG. 2 is a conceptual diagram for explaining function generation according to the first embodiment of the present disclosure. FIG. 7 is a functional block diagram showing an example of functions provided in a first regulating valve control section according to a second embodiment of the present disclosure. FIG. 7 is a functional block diagram showing an example of functions provided in a first regulating valve control section according to a third embodiment of the present disclosure. FIG. 7 is a conceptual diagram for explaining generation of a function according to a third embodiment of the present disclosure. FIG. 7 is a diagram for explaining a method of setting a target value of a cooling water flow rate in a third embodiment of the present disclosure. FIG. 7 is a functional block diagram showing an example of functions provided in a first regulating valve control section according to a fourth embodiment of the present disclosure.

[First embodiment]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, a power plant, a steam cooling system, a control device therefor, and a control method according to a first embodiment of the present disclosure will be described with reference to the drawings. In the following description, a geothermal power plant is exemplified as a power generation plant, and a case where a steam cooling system is applied to this geothermal power plant will be described as an example, but the present invention is not limited to this example. The power generation plant may be a gas turbine combined cycle power plant (GTCC), a steam power plant, a coal gasification integrated cycle power plant (IGCC), or the like in addition to a geothermal power plant. Also, the steam cooling system can be applied to various power plants equipped with condensers and cooling towers.
Note that "up and down" described below refers to up and down in the vertical direction (direction of gravity), and "left and right" refers to mutually opposite directions in the horizontal direction with respect to a certain subject.

FIG. 1 is a schematic configuration diagram schematically showing the configuration of a geothermal power generation plant 1 according to the present embodiment. In FIG. 1, a steam cooling system 5 is a system for cooling steam discharged from a turbine included in the geothermal power generation plant 1.

As shown in FIG. 1, a geothermal power plant 1 includes a turbine 2 to which steam separated from geothermal fluid obtained from a production well is supplied, a generator 3 that operates by driving the turbine 2 to generate electricity, and a turbine 2. The steam cooling system 5 is provided for cooling the steam G that has been used for work. Note that for equipment (such as a production well) for generating steam from geothermal fluid and supplying it to the turbine 2, a known technique may be adopted. An example is the system disclosed in Patent Document 1.

The steam cooling system 5 includes a condenser 6 and a cooling tower 7.
The condenser 6 cools and condenses the steam G by exchanging heat between the steam G that has done work in the turbine 2 and the cooling water CW supplied from the cooling tower 7, and generates hot water (condensed medium) HW. do. In this embodiment, for example, the condenser 6 is described as a direct contact condenser that generates hot water HW by bringing the cooling water CW from the cooling tower 7 into direct contact with the steam G that has done work in the turbine 2. do.

For example, the steam G that has done work in the turbine 2 comes into contact with the cooling water CW sprayed from the water spray nozzle 15 provided in the internal space 6S of the condenser 6, and is condensed to become hot water HW. The hot water HW is stored below the internal space 6S of the condenser 6.

The cooling tower 7 cools the hot water HW by exchanging heat between the hot water HW supplied from the condenser 6 and air (atmosphere), and generates cooling water (cooling medium) CW. In this embodiment, a water spray nozzle 16 is provided above the internal space 7S of the cooling tower 7 to spray hot water HW supplied from the condenser 6. The hot water HW sprayed from the water spray nozzle 16 is cooled by contacting with air, and cooling water CW is generated. Cooling water CW is stored below the internal space 7S of the cooling tower 7. A fan 14 is installed on the roof of the cooling tower 7. Gas such as water vapor generated during the cooling process is diffused upward into the atmosphere by the fan 14. Further, a part of the cooling water CW generated in the cooling tower 7 is returned underground from a reinjection well (not shown) or is discharged into the sea, rivers, etc. via a wastewater treatment facility.

The steam cooling system 5 includes a first adjustment section for adjusting the flow rate of cooling water CW supplied from the cooling tower 7 to the condenser 6 and a flow rate of hot water HW supplied from the condenser 6 to the cooling tower 7. and a second adjustment section for adjusting. In this embodiment, for convenience of explanation, the water supplied from the cooling tower 7 to the condenser 6 is referred to as cooling water CW, and the water supplied from the condenser 6 to the cooling tower 7 is referred to as hot water HW. , the cooling water CW and the hot water HW are the same medium with different states such as temperature.

In the present embodiment, the first regulating section includes, for example, a first regulating valve 8 provided in a first pipe 11 that connects the cooling tower 7 and the condenser 6 and through which the cooling water CW flowing out from the cooling tower 7 flows. It is realized as. By adjusting the opening degree of the first regulating valve 8, the flow rate of cooling water CW supplied from the cooling tower 7 to the condenser 6 is adjusted. Here, the first adjustment section is not limited to the first adjustment valve 8, and may be any mechanism that can adjust the flow rate of the cooling water CW. For example, the limiting member disclosed in Patent Document 1 and the limiting member may be realized as a moving device capable of moving the limiting member.

In the present embodiment, the second adjustment section includes, for example, a second adjustment valve 9 provided in a second pipe 12 that connects the condenser 6 and the cooling tower 7 and through which hot water HW flowing out from the condenser 6 flows. It is realized as. The second regulating valve 9 is provided in the second pipe 12 on the downstream side of the hot water flow of the pump 13, which will be described later. By adjusting the opening degree of the second regulating valve 9, the flow rate of hot water HW supplied from the condenser 6 to the cooling tower 7 is adjusted. Here, the second adjustment section is not limited to the second adjustment valve 9, but may be any mechanism that can adjust the flow rate of the hot water HW. For example, as described later, it may be realized using a pump 13 whose rotation speed is variable.

In this embodiment, the steam cooling system 5 includes a pump 13 provided in the second pipe 12. Pump 13 sends hot water HW generated in condenser 6 to cooling tower 7 . For example, the pump 13 may be a pump driven at a fixed rotation speed, or may be equipped with an inverter (not shown), and the rotation speed can be varied by adjusting the frequency of drive power supplied to the inverter. The pump may also be used as a pump.

The steam cooling system 5 also includes a control device 10 for controlling the opening degree of the first regulating valve 8, the opening degree of the second regulating valve 9, and the rotation speed of the pump 13. Details of the control device 10 will be described later.

In addition, the steam cooling system 5 includes a liquid level sensor 21 for detecting the liquid level height L1 of the cooling water CW stored in the lower part of the cooling tower 7, and a temperature T1 of the cooling water CW at the first pipe 11. It is equipped with a temperature sensor 22 for this purpose. The installation position of the temperature sensor 22 is not limited to this example. For example, the temperature sensor 22 may be provided in the cooling tower 7. Further, the steam cooling system 5 may include a flow rate sensor 23 that detects the flow rate F1 of the cooling water CW. Further, instead of using the flow rate sensor 23, the flow rate F1 of the cooling water CW may be calculated from the heat mass balance of the geothermal power generation plant 1.
The steam cooling system 5 also includes a liquid level sensor 24 for detecting the liquid level height L2 of the hot water HW stored in the lower part of the condenser 6, and a liquid level sensor 24 for detecting the temperature T2 of the hot water HW in the second pipe 12. The temperature sensor 25 may be provided. The steam cooling system 5 may also include a pressure sensor 26 that detects the condenser pressure Pc, which is the pressure in the internal space 6S of the condenser 6, and a pressure sensor 27 that detects the atmospheric pressure Pa. Here, the condenser pressure Pc may be obtained using a saturation pressure based on the condenser temperature. Furthermore, the local average atmospheric pressure may be substituted for the atmospheric pressure Pa.
Note that, instead of the pressure sensors 26 and 27, the steam cooling system 5 may include a differential pressure sensor that detects a vacuum differential pressure ΔPcg that is the differential pressure between the atmospheric pressure Pa and the condenser pressure Pc. Measured values detected by these various sensors are output to the control device 10 as electrical signals.

In the steam cooling system 5, the condenser pressure Pc is adjusted to be lower than the pressure in the internal space 7S of the cooling tower 7. The pressure in the internal space 7S of the cooling tower 7 is, for example, atmospheric pressure. Further, the condenser pressure Pc is adjusted to a vacuum state, which is a pressure lower than atmospheric pressure, for example. Cooling water CW is supplied from the cooling tower 7 to the condenser 6 via the first pipe 11 due to the pressure difference between the pressure in the internal space 7S of the cooling tower 7 and the condenser pressure Pc. Further, the flow rate of the cooling water CW supplied from the cooling tower 7 to the condenser 6 is adjusted by the first regulating valve 8 .

The hot water HW stored below the internal space 6S of the condenser 6 is pressurized by the operation of the pump 13 disposed in the second pipe 12, and is supplied to the internal space 7S of the cooling tower 7 via the second pipe 12. Supplied. Further, the amount of hot water HW supplied from the condenser 6 to the cooling tower 7 is adjusted by a second regulating valve 9.

FIG. 2 is a diagram showing an example of the hardware configuration of the controller 10. As shown in FIG. The control device 10 includes, for example, a CPU (Central Processing Unit) 31, a main memory 32, a secondary storage 33, a communication interface 34, and the like. Further, the control device 10 may include an input device 35, an output device 36, an external interface (not shown), and the like.

The CPU 31 controls the steam cooling system 5 using, for example, an OS (Operating System) stored in a secondary storage device 33 connected via a bus. One or more CPUs 31 may be provided and may cooperate with each other to realize processing.

The main storage device 32 is composed of a writable memory such as a cache memory and a RAM (Random Access Memory), and is used as a work area for reading an execution program of the CPU 31, writing processing data by the execution program, etc. .

The secondary storage device 33 is a non-transitory computer readable storage medium. The secondary storage device 33 is, for example, a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Examples of the secondary storage device 33 include ROM (Read Only Memory), HDD (Hard Disk Drive), SSD (Solid State Drive) flash memory, and the like. The secondary storage device 33 includes, for example, an OS for controlling the steam cooling system 5 such as Windows (registered trademark), iOS (registered trademark), and Android (registered trademark), BIOS (Basic Input/Output System), and peripherals. It stores various device drivers, various application software, and various data and files for operating the hardware of devices. Further, the secondary storage device 33 stores programs for implementing various processes and various data required for implementing various processes. A plurality of secondary storage devices 33 may be provided, and the above programs and data may be stored in each secondary storage device 33 in a divided manner.

A series of processes for realizing various functions of the control device 10, which will be described later, are stored, for example, in the form of a program in a secondary storage device 33, and the CPU (processor) 31 stores this program in the main storage device. Various functions are realized by reading out the information to 32 and processing and calculating the information. Note that the program may be installed in the secondary storage device 33 in advance, provided in a form stored in another non-transitory computer-readable storage medium, or provided via wired or wireless communication means. A form of distribution may also be applied. Examples of non-transitory computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.

FIG. 3 is a functional block diagram showing an example of the functions included in the control device 10. As shown in FIG. 3, the control device 10 includes a first regulating valve control section 41 that controls the opening degree of the first regulating valve 8. Details of the first regulating valve control section 41 will be described later.

Further, the control device 10 may include a second regulating valve control section 42 that controls the opening degree of the second regulating valve. For example, the second regulating valve control unit 42 controls the opening degree of the second regulating valve 9 so that the liquid level L2 of the hot water HW stored in the lower part of the internal space 6S of the condenser 6 does not exceed a reference value. control.

Further, the control device 10 may include a pump control section 43 that controls the pump 13. The pump control unit 43 controls the pump 13 so that the rotation speed of the pump 13 becomes a predetermined rotation speed, for example. That is, the pump control unit 43 drives the pump 13 at a predetermined rotation speed.

Next, the first regulating valve control section 41 included in the control device 10 will be described in detail. FIG. 4 is a functional block diagram showing an example of the functions included in the first regulating valve control section 41. As shown in FIG. As shown in FIG. 4, the first regulating valve control section 41 includes, for example, a measured value acquisition section 51, a calculation section 52, and a control command section 53. Further, the first regulating valve control section 41 may include a database 54 and a machine learning section 55.

The measured value acquisition unit 51 acquires measured values of parameters related to the steam cooling system 5. This parameter includes a vacuum differential pressure ΔPcg, which is the pressure difference between atmospheric pressure Pa and condenser pressure Pc. In addition, these parameters include the temperature T1 of the cooling water CW, the liquid level L1 of the cooling water CW stored in the cooling tower 7, the temperature T2 of the hot water HW, and the liquid level of the hot water HW stored in the condenser 6. It may include at least one of the heights L2. These measured values are acquired by the various sensors shown in FIG. Note that the vacuum differential pressure ΔPcg may be calculated by acquiring measurement values from the pressure sensor 27 that measures atmospheric pressure and the pressure sensor 26 that measures the condenser pressure Pc, respectively, and calculating from these measurement values. .

The calculating unit 52 calculates the opening degree (operated amount) Z2 of the second regulating valve (second regulating unit) 9 from the parameters related to the steam cooling system 5 to the target value. It holds information for calculating the opening degree (operated amount) Z1. The calculation unit 52 calculates the opening degree Z1 of the first regulating valve 8 based on this information and the measured values of each parameter acquired by the measured value acquisition unit 51.

Here, the "information" for calculating the opening degree Z1 of the first regulating valve 8 is, for example, a function. This function is, for example, a function that is derived from a simulation result obtained by performing a simulation simulating the steam cooling system 5 in advance. For example, in the simulation, the opening degree Z2 of the second regulating valve 9 obtained as a result of changing the opening degree Z1 of the first regulating valve 8 and various parameters within a predetermined range is obtained. Then, a function is generated from these data groups using machine learning.

For example, FIG. 5 is a conceptual diagram for explaining function generation according to this embodiment. For convenience of explanation, FIG. 5 illustrates a case where vacuum differential pressure ΔPcg is used as a parameter. Note that when using a plurality of parameters, the dimensions may be increased according to the number of parameters. FIG. 5 shows an example of the relationship between the vacuum differential pressure ΔPcg and the opening Z1 of the first regulating valve 8 such that the opening Z2 of the second regulating valve 9 is constant at 80%, 85%, and 90%. has been done. In FIG. 5, the horizontal axis (X-axis) is the vacuum differential pressure ΔPcg, and the vertical axis (Y-axis) is the opening degree Z1 [%] of the first regulating valve 8. The characteristics shown in FIG. 5 are obtained by, for example, obtaining the opening degree Z2 of the second regulating valve 9 when the opening degree Z1 of the first regulating valve 8 and the vacuum differential pressure ΔPcg are changed within a predetermined range in a simulation. , which was obtained by performing machine learning based on these data. Specifically, a model is created for each opening degree Z2 of the second regulating valve 9 from the data obtained through the above simulation, and by optimizing (fitting) the model, each opening degree Z2 (for example, 80%, 85% %, 90%, etc.). Machine learning (multiple regression analysis, neural networks, etc.) may be used for model fitting. Note that in FIG. 5, each function is shown as a straight line (linear function) for convenience of explanation, but the function model is not limited to this example. Moreover, when a plurality of parameters are used as parameters regarding the steam cooling system 5, the function is set to include those parameters as variables.

The function generated in this way is given to the calculation unit 52 in advance. The calculation unit 52 provides the various parameters acquired by the measured value acquisition unit 51 as variables to a pre-held function, thereby adjusting the first adjustment valve to set the opening degree Z2 of the second adjustment valve 9 to the target value. The opening degree Z1 of No. 8 is calculated. Here, the target value of the opening degree Z2 is a value appropriately set within the range of the opening degree from 70% to 90%, for example. In this embodiment, as an example, control is performed to keep the opening degree Z2 constant at 80%.

The control command section 53 generates a control signal to be given to the first regulating valve 8 using the opening degree Z1 calculated by the calculating section 52 as a command value, and outputs the control signal to the first regulating valve 8 . As a result, the first regulating valve 8 is controlled to the opening degree Z1 calculated by the calculation unit 52.

The database 54 stores the measured values of each parameter (ΔPcg, T1, T2, L1, L2) acquired by the measured value acquisition unit 51, the opening degree Z2 of the second regulating valve 9, and the The opening degree Z1 of the first regulating valve 8 is stored and accumulated as an operation data group (data set). As a result, actual operating data of the steam cooling system 5 will be accumulated in the database 54.

Here, the first regulating valve control section 41 may include a data set generation section (not shown) that generates a data set. For example, the data set generation unit generates the measured values of each parameter (ΔPcg, T1, T2, L1, L2) acquired by the measured value acquisition unit 51, the opening degree Z1 of the first regulating valve 8, and the opening degree Z1 of the second regulating valve 9. The opening degree Z2 is acquired and stored in the database 54 as one data set. In this case, the opening degree Z1 of the first regulating valve 8 may be acquired from the calculation unit 52, for example. Further, the opening degree Z2 of the second regulating valve 9 may be acquired from the second regulating valve control section 42, for example.

The machine learning unit 55 performs machine learning using a plurality of driving data stored in the database 54 at a predetermined timing, and generates a function. Note that the method for generating the function is the same as when using the simulation results described above. The function generated by the machine learning section 55 is given to the calculation section 52, and the function is updated.

In order to generate a function using machine learning, a certain amount of data is required. For this reason, as mentioned above, until a predetermined number of operational data groups are accumulated, a function generated based on data obtained by simulation using design values is used. After this has been accumulated, a function generated using the actual driving data group will be used. The function generated based on the operating data group reflects individual differences in the flow rate characteristics of the valve. This makes it possible to control the first regulating valve 8 with higher precision than when using a function generated based on simulation results using design values.
In addition to obtaining the operating data through simulation, a predetermined number of operating data may also be obtained by, for example, performing a parameter change test during a trial run period or the like.

Furthermore, the functions used by the calculation unit 52 may be updated by continuously accumulating data and intermittently generating functions by machine learning at predetermined timings. By updating the function in this way, it becomes possible to control the first regulating valve 8 using a function that reflects changes in characteristics due to changes over time in various devices included in the steam cooling system 5. . Examples of changes over time include a decrease in the performance of the pump 13 due to deterioration, a decrease in the flow area of the first pipe 11 and the second pipe 12 due to the influence of adhesion and accumulation of impurities contained in the geothermal fluid, and a decrease in the flow area of the water spray nozzle 15. Examples include partial occlusion of 16.

Next, a method of controlling the above-mentioned steam cooling system 5 will be explained.
During operation of the geothermal power plant 1, steam G that has completed work in the turbine 2 is discharged to the condenser 6. The steam G is cooled by direct contact with the cooling water CW sprayed from the upper part of the internal space 6S of the condenser 6, and hot water HW is generated. This hot water HW is stored in the lower part of the internal space 6S.

The hot water HW stored in the lower part of the internal space 6S of the condenser 6 is discharged from the condenser 6 to the second pipe 12 by driving the pump 13. The discharged hot water HW is supplied to the cooling tower 7 through the second pipe 12. In the cooling tower 7, the hot water HW is cooled by, for example, direct contact with the atmosphere. The cooled hot water HW is stored in the lower part of the internal space 7S of the cooling tower 7 as cooling water CW.

The cooling water CW stored in the lower part of the cooling tower 7 is supplied from the cooling tower 7 to the condenser 6 through the first pipe 11 due to the vacuum differential pressure ΔPcg. Thereby, in the internal space 6S of the condenser 6, the steam G and the cooling water CW come into direct contact with each other, whereby the steam G is cooled and hot water HW is generated. In this way, water as a medium circulates between the condenser 6 and the cooling tower 7 while changing its temperature.

During operation of the steam cooling system 5, the opening degree Z1 of the first regulating valve 8 provided in the first pipe 11 has a target value equal to the opening degree Z2 of the second regulating valve 9 provided in the second pipe 12. It is controlled by the control device 10 as follows.
Specifically, each measured value (ΔPcg, T1, L1, T2, L2) of the parameters regarding the steam cooling system 5 measured by various sensors is acquired by the measured value acquisition unit 51. Then, the calculation unit 52 calculates the opening degree Z1 of the first regulating valve 8 using these acquired measurement values and a function held in advance. This opening degree Z1 is an opening degree for setting the opening degree Z2 of the second regulating valve 9 to a target value. Then, the control command unit 53 generates a control signal for controlling the first regulating valve 8 based on the calculated opening degree Z1, and outputs it to the first regulating valve 8. As a result, the first regulating valve 8 is controlled at the opening degree Z1.

Further, the pump 13 is controlled at a predetermined rotation speed by the pump control unit 43, and the opening degree Z2 of the second regulating valve 9 is adjusted so that the liquid level height L2 of the condenser 6 does not exceed a reference value. It is controlled by the 2-regulating valve control section 42. Here, as described above, the flow rate of the cooling water CW supplied to the condenser 6 is controlled so that the opening degree Z2 of the second regulating valve 9 is constant at the target value. The opening degree Z2 of No. 9 will naturally be adjusted near the target value. Thereby, it becomes possible to adjust the amount of water circulation in the steam cooling system 5 to an appropriate range according to the vacuum differential pressure ΔPcg.

As described above, according to the power generation plant, steam cooling system, control device, and control method thereof according to the present embodiment, the following effects are achieved.

Since the opening degree Z1 of the first regulating valve 8 for setting the opening degree Z2 of the second regulating valve 9 to the target value is calculated using the parameters related to the steam cooling system 5 including the vacuum differential pressure ΔPcg, the vacuum differential pressure ΔPcg It becomes possible to adjust the cooling water flow rate to an appropriate range depending on the situation. The vacuum differential pressure ΔPcg changes depending on the external environment such as temperature, atmospheric pressure, and humidity. Therefore, by adjusting the cooling water flow rate according to the vacuum differential pressure ΔPcg, it is possible to control the first regulating valve 8 in consideration of changes in the external environment such as temperature, atmospheric pressure, and humidity. This makes it possible to suppress the influence of the external environment on the steam cooling system 5.

Furthermore, by controlling the opening degree Z1 of the first regulating valve 8 so that the opening degree Z2 of the second regulating valve 9 becomes the target value, the amount of water circulated in the steam cooling system 5 can be adjusted to an appropriate range. I can do it. Generally, the flow rate sensor 23 that measures the cooling water flow rate F1 has a large error in the measured value and may have low reliability. Furthermore, since the cooling water system that supplies the cooling water CW from the cooling tower 7 to the condenser 6 uses a vacuum pressure difference, the cooling water flow rate F1 is easily influenced by the vacuum pressure difference. On the other hand, the hot water system that supplies hot water HW from the condenser 6 to the cooling tower 7 has a large pressure difference (pressurization) caused by the pump 13, and therefore is not easily affected by the vacuum pressure difference. Therefore, by controlling the opening degree Z1 of the first regulating valve 8 so as to set the second regulating valve 9 to a predetermined opening degree, it becomes possible to stably control the cooling water flow rate to a desired flow rate. . Further, according to the present embodiment, since the flow rate sensor 23 that measures the cooling water flow rate F1 can be omitted, the present embodiment can be easily applied to the power generation plant 1 that does not include the flow rate sensor 23.

Furthermore, by controlling the opening degree Z2 of the second regulating valve 9 to be a little more open than the commonly used opening degree (for example, 60% to 70%), the cooling efficiency of the steam cooling system 5 can be stabilized. In turn, it becomes possible to stabilize the output of the geothermal power plant 1.
That is, when the condenser pressure Pc is high, the vacuum differential pressure ΔPcg becomes small, so the output of the generator 3 decreases. In such a case, it is preferable to increase the flow rate of the cooling water CW supplied from the cooling tower 7 to the condenser 6 as much as possible. For this reason, for example, the opening degree Z2 of the second regulating valve 9 is set to a value that is slightly open compared to the generally used opening degree, and the amount of water (medium) circulated in the steam cooling system 5 is increased. This makes it possible to stabilize the cooling efficiency of the steam cooling system 5 and, in turn, to stabilize the output of the geothermal power plant 1.

The opening degree Z2 of the second regulating valve 9 is appropriately set, for example, in the range of 70% to 90%, preferably in the range of 75% to 90%, more preferably in the range of 75% to 85%. good. Note that if the opening degree Z2 of the second regulating valve 9 exceeds 90%, it will become saturated and the flow rate control will become ineffective, so it is preferable that the opening degree Z2 of the second regulating valve 9 be set to 90% or less.

[Second embodiment]
Next, a power plant, a steam cooling system, a control device, and a control method thereof according to a second embodiment of the present disclosure will be described with reference to the drawings.

In the first embodiment described above, the function used by the calculation unit 52 is updated by continuously accumulating the driving data group and continuously generating the function by the machine learning unit 55 at a predetermined timing. Ta. By updating the function in this way, it becomes possible to reflect changes in characteristics due to changes over time of various devices included in the steam cooling system 5 in the function.

In contrast, in the present embodiment, instead of or in addition to updating the function using the machine learning unit 55, the opening degree Z1 calculated by the calculation unit 52 is corrected, so that the steam cooling system 5 is equipped with Changes in characteristics due to changes in various devices over time are reflected in the control of the first regulating valve 8. Hereinafter, regarding the power plant, the steam cooling system, the control device thereof, and the control method according to the present embodiment, a description of common points with the above-described first embodiment will be omitted, and different points will be mainly described.

FIG. 6 is a functional block diagram showing an example of functions provided in the first regulating valve control section 41a according to the second embodiment of the present disclosure. As shown in FIG. 6, the first regulating valve control section 41a according to the present embodiment further includes a correction section 56.

For example, the calculation unit 52 calculates the opening degree Z1 of the first regulating valve 8 such that the opening degree Z2 of the second regulating valve 9 is the target value (for example, 80%). However, changes in characteristics of various devices included in the steam cooling system 5 (for example, a decrease in the performance of the pump 13, a decrease in the flow area of the first pipe 11 and the second pipe 12 due to the influence of impurities contained in the geothermal fluid, and changes in the water spray nozzle) 15, 16), even if the first regulating valve 8 is controlled at the opening degree Z1 determined from a pre-given function, the actual opening degree Z2 of the second regulating valve 9 may not be the target. There is a possibility that it deviates from the value (for example, 80%). For example, when the discharge pressure at a predetermined rotation speed decreases due to a decrease in the performance of the pump 13, the second regulating valve 9 opens at an opening Z2 larger than the target value in order to ensure the flow rate of the hot water HW flowing through the second pipe 12. It will be controlled by Therefore, in this case, it is necessary to control the opening degree Z1 of the first regulating valve 8 in the direction of closing to reduce the amount of water circulation and to prevent the second regulating valve 9 from opening too much.

Therefore, the correction unit 56 calculates a correction value according to the difference between the target value (for example, 80%) of the opening degree Z2 of the second regulating valve 9 and the actual opening degree Z2 of the second regulating valve 9. Then, the opening degree Z1 calculated by the calculation unit 52 is corrected using the calculated correction value.

For example, the correction unit 56 has in advance a function that associates the difference between the target value of the opening degree Z2 of the second regulating valve 9 and the opening degree Z2 of the second regulating valve 9 with a correction value, and this function is The correction value may be calculated using The function given in advance may be generated by performing a simulation in advance, for example.

The control command section 53 generates a control command based on the corrected opening degree Z1' and outputs it to the first regulating valve 8.

According to the power generation plant, steam cooling system, control device, and control method thereof according to the present embodiment, even when characteristics changes occur in various devices included in the steam cooling system 5 due to changes over time, the 1 adjustment valve 8 can be controlled.

In this embodiment, for example, instead of providing the correction unit 56, the target value (for example, 80%) of the opening degree Z2 of the second regulating valve 9 and the actual opening degree Z2 of the second regulating valve 9 are adjusted. When the difference is greater than or equal to a predetermined reference value, the function may be updated by the machine learning unit 55.
By doing this, it becomes possible to update the function at an appropriate timing.
Here, the update timing of the function is not limited to the above example. For example, the function may be updated by the machine learning unit 55 when a state in which the difference is greater than or equal to a predetermined reference value continues for a predetermined period of time. Alternatively, the function may be updated when an update instruction is input by the operator.

In addition, in the first or second embodiment described above, a case has been described in which the steam cooling system 5 includes the second regulating valve 9, but the second regulating valve 9 may be omitted. In this case, the flow rate of the hot water HW may be adjusted by controlling the rotation speed of the pump 13. That is, in this case, the opening degree Z1 of the first regulating valve 8 is controlled so as to keep the rotation speed of the pump 13 constant at the target value. Further, the pump 13 is controlled by the pump control unit 43 so that the liquid level L2 of the hot water HW stored in the condenser 6 is equal to or less than a reference value.

[Third embodiment]
Next, a power plant, a steam cooling system, a control device therefor, and a control method according to a third embodiment of the present disclosure will be described with reference to the drawings.

In the first embodiment described above, the opening degree Z1 of the first regulating valve 8 is calculated such that the opening degree Z2 of the second regulating valve 9 becomes the target value. In contrast, in the present embodiment, the opening degree Z1 of the first regulating valve 8 is calculated such that the flow rate of the cooling water CW supplied from the cooling tower 7 to the condenser 6 is constant. This is different from the first embodiment.
Hereinafter, regarding the power plant, the steam cooling system, the control device thereof, and the control method according to the present embodiment, a description of common points with the above-described first embodiment will be omitted, and different points will be mainly described.

FIG. 7 is a functional block diagram showing an example of functions provided in the first regulating valve control section 41b according to the third embodiment of the present disclosure. As shown in FIG. 7, the first regulating valve control section 41b includes, for example, a measured value acquisition section 51b, a calculation section 52b, and a control command section 53b. Further, the first regulating valve control section 41b may further include a database 54b and a machine learning section 55b.

The measured value acquisition unit 51b acquires measured values of parameters related to the steam cooling system 5. These parameters include the vacuum differential pressure ΔPcg and the cooling water flow rate F1. Further, this parameter may include at least one of the cooling water temperature T1 and the liquid level height L1 of the cooling water stored in the cooling tower 7. The method of acquiring these measured values is the same as in the first embodiment.

The calculation unit 52b has information for calculating the opening degree (operated amount) Z1 of the first regulating valve (first regulating unit) 8 with the target value of the flow rate of the cooling water from the parameters related to the steam cooling system 5. There is. Then, the calculation unit 52b calculates the opening degree Z1 of the first regulating valve 8 based on this information and the measured values of each parameter acquired by the measured value acquisition unit 51b.

Here, the "information" for calculating the opening degree Z1 of the first regulating valve 8 is, for example, a function. This function is, for example, a function that is derived from a simulation result obtained by performing a simulation simulating the steam cooling system 5 in advance. For example, in the simulation, the cooling water flow rate F1 obtained as a result of changing the opening degree Z1 of the first regulating valve 8 and various parameters within a predetermined range is obtained. Then, a function is generated from these data groups using machine learning.

For example, FIG. 8 is a conceptual diagram for explaining function generation according to this embodiment. For convenience of explanation, FIG. 8 illustrates a case where vacuum differential pressure ΔPcg is used as a parameter. Note that when using a plurality of parameters, the dimensions may be increased according to the number of parameters. FIG. 8 shows an example of the relationship between the vacuum differential pressure ΔPcg and the opening degree Z1 of the first regulating valve 8 such that the cooling water flow rate F1 is constant at 80%, 100%, and 110%. In FIG. 8, the horizontal axis (X-axis) is the vacuum differential pressure ΔPcg, and the vertical axis (Y-axis) is the opening degree Z1 [%] of the first regulating valve 8. The characteristics shown in FIG. 8 are obtained by, for example, obtaining the cooling water flow rate F1 when the opening degree Z1 of the first regulating valve 8 and the vacuum differential pressure ΔPcg are changed within a predetermined range, and then adjusting the machine based on these data. This is something that is obtained through learning. Specifically, by forming a model for each cooling water flow rate F1 from data obtained through simulation and optimizing (fitting) that model, each cooling water flow rate F1 (for example, 80%, 100%, 110%, etc.) ). Machine learning (multiple regression analysis, neural networks, etc.) may be used for model fitting. Note that in FIG. 8, each function is shown as a straight line (linear function) for convenience of explanation, but the function model is not limited to this example. Moreover, when a plurality of parameters are used as parameters regarding the steam cooling system 5, the function is set to include those parameters as variables.

The function generated in this way is given in advance to the calculation unit 52b and is held. The calculation unit 52b calculates the opening degree Z1 of the first regulating valve 8 to set the cooling water flow rate F1 to the target value by substituting various parameters acquired by the measured value acquisition unit 51b into a predetermined function. do. Here, the target value may be set to a fixed value (for example, 100%) or may be changed depending on the vacuum differential pressure ΔPcg.

For example, when the vacuum differential pressure ΔPcg is relatively large, the thermal drop becomes large, so a constant turbine output can be obtained even if the flow rate of cooling water is reduced. Therefore, for example, as shown in FIG. 9, when the vacuum differential pressure ΔPcg is the first threshold value P1, the cooling water flow rate is set to 110%, and when the vacuum differential pressure ΔPcg is the second threshold value P2, the cooling water flow rate is set to 100%, and the vacuum difference When the pressure ΔPcg is the third threshold value P3, the cooling water flow rate may be set to 80%, and by interpolating those points, a target value for each value of the vacuum differential pressure ΔPcg may be set. Note that the method for setting the target value is just one example; one or more threshold values may be set and the target value may be changed in stages, or a function including the vacuum differential pressure ΔPcg as a variable may be prepared in advance and the The target value of the cooling water flow rate may be obtained by substituting the vacuum differential pressure ΔPcg into the function.

The control command section 53b generates a control signal to be given to the first regulating valve 8 using the opening degree Z1 calculated by the calculating section 52b as a command value, and outputs the control signal to the first regulating valve 8. As a result, the first regulating valve 8 is controlled to the opening degree Z1 calculated by the calculating section 52b.

The database 54b stores the measured values of each parameter (ΔPcg, F1, T1, L1) and the opening degree Z1 of the first regulating valve 8 acquired by the measured value acquisition unit 51b as a group of operational data during operation of the steam cooling system 5. Store and accumulate as. Thereby, actual operating data of the steam cooling system 5 will be accumulated in the database 54b.

Here, the first regulating valve control section 41b may include a data set generation section (not shown) that generates a data set. For example, the data set generation unit acquires the measured values of each parameter (ΔPcg, F1, T1, L1) acquired by the measured value acquisition unit 51b and the opening degree Z1 of the first regulating valve 8, and converts these into one data. It is stored in the database 54b as a set. In this case, the opening degree Z1 of the first regulating valve 8 may be obtained from the calculation unit 52b, for example.

The machine learning unit 55b performs machine learning at a predetermined timing using a plurality of driving data stored in the database 54b, and generates a function. Note that the method for generating the function is the same as when using the simulation results described above. The function generated by the machine learning section 55b is given to the calculation section 52b, and the function is updated.

In order to generate a function using machine learning, a certain amount of data is required. For this reason, as mentioned above, until a predetermined number of operational data groups are accumulated, a function generated based on data obtained by simulation using design values is used. After this has been accumulated, a function generated using the actual driving data group will be used. The function generated based on the operating data group reflects individual differences in the flow rate characteristics of the valve. This makes it possible to control the first regulating valve 8 with higher precision than when using a function generated based on simulation results using design values.
In addition to obtaining the operating data through simulation, a predetermined number of operating data may also be obtained by, for example, performing a parameter change test during a trial run period or the like.

Further, the functions used by the calculation unit 52b may be updated periodically by continuously accumulating data and generating functions by machine learning at predetermined time intervals. By updating the function in this way, it becomes possible to control the first regulating valve 8 using a function that reflects changes in characteristics due to changes over time in various devices included in the steam cooling system 5. . The change over time is as described in the first embodiment.

According to the steam cooling system 5 according to the present embodiment, by inputting the measured values (ΔPcg, F1, T1, L1) of parameters related to the steam cooling system 5 measured by various sensors to the measured value acquisition unit 51b, be obtained. Then, the calculation unit 52b calculates the opening degree Z1 of the first regulating valve 8 using these acquired measurement values (ΔPcg, T1, L1) and a function held in advance. This opening degree Z1 is an opening degree for setting the cooling water flow rate to a target value. Then, the control command unit 53b generates a control signal for controlling the first regulating valve 8 based on the calculated opening degree Z1, and outputs it to the first regulating valve 8. As a result, the first regulating valve 8 is controlled at the opening degree Z1.

Further, the pump 13 is controlled at a predetermined rotation speed by the pump control unit 43, and the opening degree Z2 of the second regulating valve 9 is determined based on the relationship between the liquid level height L2 of the condenser 6 and the reference plane. , is controlled by the second regulating valve control section 42.

As described above, according to the power generation plant, steam cooling system, control device, and control method thereof according to the present embodiment, the following effects are achieved.

Since the opening degree Z1 of the first regulating valve 8 with the target value of the cooling water flow rate is calculated using parameters related to the steam cooling system including the vacuum differential pressure ΔPcg, the cooling water is adjusted to an appropriate range according to the vacuum differential pressure ΔPcg. It becomes possible to adjust the flow rate. The vacuum differential pressure ΔPcg changes depending on the external environment such as temperature, atmospheric pressure, and humidity. Therefore, by adjusting the cooling water flow rate F1 to a constant value according to the vacuum differential pressure ΔPcg, it becomes possible to control the first regulating valve 8 in consideration of changes in the external environment such as temperature, atmospheric pressure, and humidity. . This makes it possible to suppress the influence of the external environment.

In addition, the function used by the calculation unit 52b is updated by continuously accumulating the operation data group and by continuously generating the function by the machine learning unit 55b at a predetermined timing, so that the steam cooling system 5 is updated. It becomes possible to control the first regulating valve 8 using a function that reflects changes in characteristics due to changes over time of various devices provided.

In the above description, the first regulating valve 8 is controlled using a function generated using the simulation results until a predetermined value or more of the operation data group is collected, but the present invention is not limited to this. For example, the function may be derived from equation (1) below, which represents the pressure balance of the condenser inlet system.

ΔPcg=ΔP _V1 +ΔP _L1 +ΔP _H1 (1)

Here, _ΔPV1 is a valve pressure loss, and is expressed as a function of, for example, the opening degree Z1 of the first regulating valve 8, the cooling water temperature T1, and the cooling water flow rate F1. ΔP _L1 is a pipe pressure loss, and is expressed as a function of the cooling water temperature T1 and the cooling water flow rate F1. Note that the piping pressure loss ΔP _L1 may include a spray differential pressure and a suction pressure loss. ΔP _H1 is a head differential pressure, and is expressed as a function of the cooling water temperature T1 and the cooling water level height L1. It is positive when the liquid level height L1 of the cooling water is lower than the reference value. Then, design values may be set for the vacuum differential pressure and each parameter (Z1, T1, L1), and a function of the cooling water flow rate F1 may be derived so that equation (1) holds true. For example, the parameter that has a high degree of influence on the cooling water flow rate F1 is the vacuum differential pressure ΔPcg, so when considering only this vacuum differential pressure ΔPcg, the above equation (1) can be expressed as the following equation (2). . Then, a function related to the cooling water flow rate F1 may be generated from equation (2).

ΔPcg=ΔP _V1 (Z1, F1)+ΔP _L1 (F1)+ΔP _H1 (2)

[Fourth embodiment]
Next, a power plant, a steam cooling system, a control device, and a control method thereof according to a fourth embodiment of the present disclosure will be described with reference to the drawings.

In the third embodiment described above, the function used by the calculation unit 52b is periodically updated by continuously accumulating the driving data group and generating the function by the machine learning unit 55b at predetermined time intervals. was. In this embodiment, the influence of changes in characteristics due to changes over time in various devices included in the steam cooling system 5 is reduced using a method different from that in the third embodiment. Hereinafter, regarding the power plant, the steam cooling system, the control device thereof, and the control method according to the present embodiment, a description of common points with the third embodiment described above will be omitted, and differences will be mainly described.

FIG. 10 is a functional block diagram showing an example of functions provided in the first regulating valve control section 41c according to the fourth embodiment of the present disclosure. As shown in FIG. 10, the first regulating valve control section 41c according to this embodiment further includes a correction section 56b.

For example, the opening degree Z2 of the second regulating valve 9 is controlled to adjust the cooling water flow rate F1 within a preset opening degree range (for example, a range of 60% to 70%). However, if characteristics changes occur in various devices included in the steam cooling system 5, for example, the performance of the pump 13 deteriorates, or the flow area of the first pipe 11 and the second pipe 12 changes due to the influence of impurities contained in the geothermal fluid. When the water spray nozzles 15 and 16 become clogged, the opening Z2 gradually changes beyond the preset opening range. For example, when the discharge pressure decreases due to a decrease in the performance of the pump 13, the opening degree Z2 becomes slightly open. Therefore, for example, if a reference value for the opening Z2 is set based on a preset opening range, and the difference between the reference value and the opening Z2 during operation exceeds a predetermined value, the calculation The opening degree Z1 calculated by the section 52b may be corrected.

For example, the correction unit 56b calculates a correction value according to the difference between the reference value of the opening degree Z2 and the actual opening degree Z2 of the second regulating valve 9. Then, the opening degree Z1 calculated by the calculation unit 52b is corrected using the calculated correction value.

For example, the correction unit 56b has in advance a function that associates the difference between the reference value of the opening degree Z2 and the opening degree Z2 of the second regulating valve 9 with a correction value, and uses this function to calculate the correction value. You may. The function given in advance may be generated by performing a simulation in advance, for example.

The control command section 53b generates a control command based on the corrected opening degree Z1' and outputs it to the first regulating valve 8.

According to the power generation plant, steam cooling system, control device, and control method thereof according to the present embodiment, even when characteristics changes occur in various devices included in the steam cooling system 5 due to changes over time, the 1 adjustment valve 8 can be controlled.

In this embodiment, for example, instead of providing the correction unit 56b, the difference between the reference value of the opening degree Z2 of the second regulating valve 9 and the actual opening degree Z2 of the second regulating valve 9 is greater than or equal to a predetermined threshold value. In this case, the function may be updated by the machine learning unit 55b. By doing this, it becomes possible to update the function at an appropriate timing.
Here, the update timing of the function is not limited to the above example. For example, when the difference is greater than or equal to a predetermined reference value for a predetermined period of time, the function may be updated by the machine learning unit 55b. Alternatively, the function may be updated when an update instruction is input by the operator.
Further, in this embodiment, the value of the opening degree Z2 can be determined by, for example, substituting the opening degree Z1 of the first regulating valve 8 and each measured value such as the vacuum differential pressure ΔPcg into the function according to the second embodiment described above. , may be obtained by calculation. In this case, a correction value is calculated according to the difference between the estimated value of the opening degree Z2 obtained by calculation and the reference value of the opening degree Z2.

In addition, in the 3rd or 4th embodiment mentioned above, the case where the steam cooling system 5 was provided with the 2nd regulation valve 9 was demonstrated, but the 2nd regulation valve 9 may be omitted. In this case, the hot water flow rate may be adjusted by controlling the rotation speed of the pump 13. Specifically, the rotation speed of the pump 13 is controlled by the pump control unit 43 (see FIG. 3) so that the liquid level L2 of the hot water stored in the condenser 6 is below a reference value. .

Although the present disclosure has been described above using each embodiment, the technical scope of the present disclosure is not limited to the range described in the above embodiments. Various changes or improvements can be made to the embodiments described above without departing from the gist of the invention, and forms with such changes or improvements are also included within the technical scope of the present disclosure. Further, the above embodiments may be combined as appropriate.

For example, in each of the embodiments described above, a case has been described in which the control device 10 includes the database 54 (54b) and the machine learning section 55 (55b), but the present invention is not limited to this example. For example, the database 54 (54b) and the machine learning unit 55 (55b) may be provided on a server (for example, a cloud) that can be connected via a communication medium, and the control device 10 and the server may communicate via a communication line. The above functions may be realized by exchanging information via the communication terminal.

The power plant, steam cooling system, control device, and control method thereof described in each of the embodiments described above can be understood, for example, as follows.

The control device (10) according to the present disclosure includes a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6), and a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6). A control device (10) for a steam cooling system (5) comprising a second adjustment section (9) for adjusting the flow rate of the condensed medium supplied from the cooling tower (7) from the atmospheric pressure a measured value acquisition unit (51) that acquires measured values of parameters related to the steam cooling system, including a differential pressure (ΔPcg) between the condenser pressure and the condenser pressure that is the pressure in the internal space of the condenser; information for calculating the operation amount (Z1) of the first adjustment section (8) with the operation amount (Z2) of the second adjustment section (9) as a target value from the parameters related to the system (5); and a calculation unit (52) that calculates the operation amount (Z1) of the first adjustment unit (8) based on the measured value acquired by the value acquisition unit (51).

According to the control device (10) according to the present disclosure, it is possible to adjust the cooling water flow rate to an appropriate range according to the vacuum differential pressure. The vacuum differential pressure changes according to changes in the external environment such as temperature, atmospheric pressure, and humidity. Therefore, by adjusting the cooling water flow rate in accordance with the vacuum differential pressure, it is possible to control the first adjustment section in consideration of changes in the external environment such as temperature, atmospheric pressure, and humidity. Thereby, the influence of changes in the external environment can be reduced. Further, the operation amount of the first adjustment section is controlled so that the opening degree of the second adjustment valve becomes the target value. Thereby, the circulation amount of the medium (for example, water) in the steam cooling system can be adjusted to an appropriate range.

In the control device (10) according to the present disclosure, the parameters regarding the steam cooling system (5) include a temperature (T1) of the cooling medium, a liquid level height (L1) of the cooling medium stored in the cooling tower (7), , the temperature of the condensed medium (T2), and the liquid level height (L2) of the condensed medium stored in the condenser (6).

According to the control device (10) according to the present disclosure, the accuracy of control of the first adjustment section can be improved.

In the control device (10) according to the present disclosure, the information may be a function for calculating the operation amount of the first adjustment section (8) from parameters related to the steam cooling system (5).

According to the control device (10) according to the present disclosure, control of the first adjustment section can be easily realized.

A control device (10) according to the present disclosure includes a measured value of a parameter related to the steam cooling system (5) acquired by the measured value acquisition unit (51) and an operation amount (Z1) of the first adjustment unit (8). Machine learning is also performed using a database (54) that stores the manipulated variable (Z2) of the second adjustment section (9) as a group of operational data, and a plurality of groups of operational data stored in the database (54). , and a machine learning unit (55) that generates the function.

According to the control device (10) according to the present disclosure, the function is generated using actual operation data, so the generated function is a function that reflects characteristics specific to equipment included in the steam cooling system. This makes it possible to improve the accuracy of control of the first adjustment section.

The control device (10) according to the present disclosure calculates a correction value according to the difference between the operation amount (Z2) of the second adjustment section (9) and the target value, and uses the correction value to adjust the calculation. A correction section (56) that corrects the operation amount (Z1) of the first adjustment section (8) calculated by the section (52) may be provided.

According to the control device (10) according to the present disclosure, changes in characteristics due to changes over time of various devices included in the steam cooling system can be reflected in the control of the first adjustment section.

The control device (10) according to the present disclosure includes a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6), and a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6). A control device (10) for a steam cooling system (5) comprising a second adjustment section (9) for adjusting the flow rate of the condensed medium supplied from the cooling tower (7) from the atmospheric pressure and a measured value acquisition unit (51b) that acquires measured values of parameters related to the steam cooling system, including a differential pressure (ΔPcg) between the condenser pressure and the condenser pressure that is the pressure in the internal space of the condenser (6); Information for calculating the manipulated variable (Z1) of the first adjustment section (8) with the flow rate (F1) of the cooling medium as a target value from the parameters related to the steam cooling system (5), and the measured value acquisition section (51b) and a calculation unit (52b) that calculates the operation amount (Z1) of the first adjustment unit (8) based on the measured value obtained by (51b).

According to the control device (10) according to the present disclosure, it is possible to adjust the cooling water flow rate to an appropriate range according to the vacuum differential pressure. The vacuum differential pressure changes depending on the external environment such as temperature, atmospheric pressure, and humidity. Therefore, by adjusting the cooling water flow rate to a constant target value using a function that uses the vacuum differential pressure as a variable, it becomes possible to control the first adjustment section in consideration of changes in the external environment. Thereby, the influence of changes in the external environment can be reduced.

In the control device (10) according to the present disclosure, parameters related to the steam cooling system (5) include a temperature (T1) of the cooling medium and a liquid level height (L1) of the cooling medium stored in the cooling tower (7). It may contain at least one of the following.

According to the control device (10) according to the present disclosure, the accuracy of control of the first adjustment section can be improved.

In the control device (10) according to the present disclosure, the information may be a function for calculating the manipulated variable (Z1) of the first adjustment section (8) from parameters related to the steam cooling system (5). .

According to the control device (10) according to the present disclosure, control of the first adjustment section can be easily realized.

A control device (10) according to the present disclosure includes a measured value of a parameter regarding the steam cooling system (5) acquired by the measured value acquisition unit (51b) and an operation amount (Z1) of the first adjustment unit (8). In addition, machine learning is performed using a database (54b) that stores the flow rate (F1) of the cooling medium as a group of operational data, and a plurality of groups of operational data stored in the database (54b) to generate the function. It may also include a machine learning section (55b).

According to the control device (10) according to the present disclosure, the function is generated using actual operation data, so the generated function is a function that reflects characteristics specific to equipment included in the steam cooling system. This makes it possible to improve the accuracy of control of the first adjustment section.

In the control device (10) according to the present disclosure, the target value of the flow rate of the cooling medium is changed according to the differential pressure (ΔPcg) between atmospheric pressure and the condenser pressure that is the pressure in the internal space of the condenser. may be done.

According to the control device (10) according to the present disclosure, the cooling water flow rate can be controlled within a more appropriate range.

The control device (10) according to the present disclosure calculates a correction value according to the difference between the operation amount (Z2) of the second adjustment section (9) and a preset reference value, and uses the correction value to calculate the correction value. , a correction unit (56b) that corrects the operation amount (Z1) of the first adjustment unit (8) calculated by the calculation unit (52b).

According to the control device (10) according to the present disclosure, changes in characteristics due to changes over time of various devices included in the steam cooling system can be reflected in the control of the first adjustment section.

A steam cooling system (5) according to the present disclosure includes a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6), and the condenser (6) to the cooling tower (7); and the control device (10).

The control method according to the present disclosure includes a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6), and A method for controlling a steam cooling system (5) comprising a second adjustment section (9) for adjusting the flow rate of the condensed medium supplied to the cooling tower (7), the method comprising: a step of obtaining measured values of parameters related to the steam cooling system (5), including a pressure difference (ΔPcg) from the condenser pressure (Pc), which is the pressure in the internal space of the water device (6); information for calculating the operation amount (Z1) of the first adjustment section (8) with the operation amount (Z2) of the second adjustment section (9) as a target value from the parameters related to the system (5); A computer executes a step of calculating an operation amount (Z1) of the first adjustment section (8) based on the measured value.

The control method according to the present disclosure includes a first adjustment section (8) for adjusting the flow rate of the cooling medium supplied from the cooling tower (7) to the condenser (6), and A method for controlling a steam cooling system (5) comprising a second adjustment section (9) for adjusting the flow rate of the condensed medium supplied to the cooling tower (7), the method comprising: a step of obtaining measured values of parameters related to the steam cooling system (5), including a pressure difference (ΔPcg) from the condenser pressure (Pc), which is the pressure in the internal space of the water device (6); Based on the information for calculating the manipulated variable (Z1) of the first adjustment section (8) that sets the flow rate of the cooling medium as a target value from the parameters related to the system (5) and the acquired measurement value, the The computer executes the step of calculating the operation amount (Z1) of the first adjustment section (8).

A program according to the present disclosure is a program for causing a computer to function as the control device (10) described above.

1: Geothermal power plant 2: Turbine 3: Generator 5: Steam cooling system 6: Condenser 6S: Internal space 7: Cooling tower 7S: Internal space 8: First regulating valve 9: Second regulating valve 10: Control device 11: First pipe 12: Second pipe 13: Pump 14: Fan 15: Water nozzle 21: Liquid level sensor 22: Temperature sensor 23: Flow rate sensor 24: Liquid level sensor 25: Temperature sensor 26: Pressure sensor 27: Pressure sensor 41: First regulating valve control section 41a: First regulating valve controlling section 41b: First regulating valve controlling section 41c: First regulating valve controlling section 42: Second regulating valve controlling section 43: Pump controlling section 51: Measured value acquisition Unit 51b: Measured value acquisition unit 52: Calculation unit 52b: Calculation unit 53: Control command unit 53b: Control command unit 54: Database 54b: Database 55: Machine learning unit 55b: Machine learning unit 56: Correction unit 56b: Correction unit CW : Cooling water F1 : Cooling water flow rate G : Steam HW : Hot water L1 : Liquid level height L2 : Liquid level height P1 : First threshold P2 : Second threshold P3 : Third threshold Pa : Atmospheric pressure Pc : Condenser Pressure T1: Cooling water temperature T2: Hot water temperature Z1: Opening degree Z1': Opening degree Z2: Opening degree ΔPcg: Vacuum differential pressure

Claims (16)

A first adjustment section for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; and a second adjustment section for adjusting the flow rate of the condensed medium supplied from the condenser to the cooling tower. A control device for a steam cooling system, comprising:
a measured value acquisition unit that acquires measured values of parameters related to the steam cooling system, including the differential pressure between atmospheric pressure and condenser pressure that is the pressure in the internal space of the condenser;
Based on the information for calculating the operation amount of the first adjustment section with the operation amount of the second adjustment section as the target value from the parameters related to the steam cooling system, and the measurement value acquired by the measurement value acquisition section and a calculation unit that calculates an operation amount of the first adjustment unit. The parameters regarding the steam cooling system include the temperature of the cooling medium, the liquid level height of the cooling medium stored in the cooling tower, the temperature of the condensing medium, and the liquid level height of the condensing medium stored in the condenser. The control device according to claim 1, comprising at least one. The control device according to claim 1 or 2, wherein the information is a function for calculating the operation amount of the first adjustment section from parameters related to the steam cooling system. a database that accumulates measured values of parameters related to the steam cooling system acquired by the measured value acquisition unit, the operation amount of the first adjustment unit, and the operation amount of the second adjustment unit as an operation data group;
The control device according to claim 3, further comprising a machine learning unit that performs machine learning using a plurality of operation data groups stored in the database and generates the function. Correction of calculating a correction value according to the difference between the operation amount of the second adjustment section and the target value, and using the correction value to correct the operation amount of the first adjustment section calculated by the calculation section. 5. The control device according to claim 1, further comprising: a controller. A first adjustment section for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; and a second adjustment section for adjusting the flow rate of the condensed medium supplied from the condenser to the cooling tower. A control device for a steam cooling system, comprising:
a measured value acquisition unit that acquires measured values of parameters related to the steam cooling system, including the differential pressure between atmospheric pressure and condenser pressure that is the pressure in the internal space of the condenser;
Based on the information for calculating the manipulated variable of the first adjustment section that sets the flow rate of the cooling medium as a target value from the parameters related to the steam cooling system, and the measured value acquired by the measured value acquisition section, A control device comprising: a calculation section that calculates an operation amount of the first adjustment section. The control device according to claim 6, wherein the parameters related to the steam cooling system include at least one of a temperature of a cooling medium and a liquid level height of a cooling medium stored in the cooling tower. The control device according to claim 6 or 7, wherein the information is a function for calculating the operation amount of the first adjustment section from parameters related to the steam cooling system. a database that accumulates the measured values of parameters related to the steam cooling system acquired by the measured value acquisition unit, the operation amount of the first adjustment unit, and the flow rate of the cooling medium as an operation data group;
The control device according to claim 8, further comprising a machine learning unit that performs machine learning using a plurality of operation data groups stored in the database and generates the function. The control according to any one of claims 6 to 9, wherein the target value of the flow rate of the cooling medium is changed according to a pressure difference between atmospheric pressure and a condenser pressure that is a pressure in an internal space of the condenser. Device. Calculate a correction value according to the difference between the operation amount of the second adjustment section and a preset reference value, and use the correction value to calculate the operation amount of the first adjustment section calculated by the calculation section. The control device according to any one of claims 6 to 10, further comprising a correction section that performs correction. a first adjustment section for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser;
a second adjustment unit for adjusting the flow rate of condensed medium supplied from the condenser to the cooling tower;
A steam cooling system comprising a control device according to any one of claims 1 to 11. turbine and
A generator that generates electricity using the driving force of a turbine,
A power generation plant comprising the steam cooling system according to claim 12. A first adjustment section for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; and a second adjustment section for adjusting the flow rate of the condensed medium supplied from the condenser to the cooling tower. A method of controlling a steam cooling system, comprising:
Obtaining measured values of parameters related to the steam cooling system, including the differential pressure between atmospheric pressure and condenser pressure, which is the pressure in the internal space of the condenser;
The first adjustment is performed based on the acquired measurement value and information for calculating the operation amount of the first adjustment section with the operation amount of the second adjustment section as a target value from the parameters related to the steam cooling system. A control method in which a computer executes the step of calculating the operation amount of the section. A first adjustment section for adjusting the flow rate of the cooling medium supplied from the cooling tower to the condenser; and a second adjustment section for adjusting the flow rate of the condensed medium supplied from the condenser to the cooling tower. A method of controlling a steam cooling system, comprising:
obtaining measured values of parameters related to the steam cooling system, including differential pressure between atmospheric pressure and condenser pressure, which is the pressure in the internal space of the condenser; A computer executes a step of calculating an operation amount of the first adjustment section based on information for calculating an operation amount of the first adjustment section with the flow rate as a target value and the acquired measurement value. Control method. A program for causing a computer to function as the control device according to any one of claims 1 to 11.