Temperature difference management support device and temperature difference management support method

Abstract

To enable power generation output of at least one of a plurality of generators to be adjusted so that a temperature difference of seawater between a seawater intake and a seawater outlet is within a temperature difference specified in an agreement with a local government.SOLUTION: A temperature difference management support device is a device which performs management support in a manner that keeps a temperature difference between when seawater is taken in through a seawater inlet and when the seawater is discharged through a seawater outlet within a predetermined temperature difference in a power generation facility comprising a plurality of generators, a plurality of condensers, and a cooling water pipe arranged opposite to the plurality of the condensers so as to exchange heat between seawater and steam. The temperature difference management support device has: a determination section which determines whether an average of temperature differences is within the predetermined temperature difference when the plurality of generators is operated at output of a current time for a remaining period after the current time in a predetermined operation period on the basis of a cumulative value of the temperature differences from a start time to a current time in the predetermined operation period; and an instruction section which instructs to curb output of at least any one of the plurality of generators so that the average of the temperature differences is within the predetermined temperature difference when the average of the temperature differences is not within the predetermined temperature difference.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a temperature difference management support device and a temperature difference management support method. [Background technology]

[0002] In thermal power plants, fuels such as coal, oil, and liquefied natural gas are burned to heat water, and the high-temperature, high-pressure steam generated in this process is used to rotate a turbine, which then rotates a generator connected to the turbine on the same shaft to generate electricity. After rotating the generator, the high-temperature, high-pressure steam is cooled by heat exchange in a surface condenser and turned back into water, before returning to the heating process.

[0003] The fluid used in the surface condenser to exchange heat with the high-temperature, high-pressure steam is, for example, seawater taken from the sea. In this case, a cooling water pipe is placed opposite the surface condenser in a position where heat exchange with the high-temperature, high-pressure steam is possible, and the seawater taken from the sea using a pump passes through the cooling water channel, exchanges heat with the high-temperature, high-pressure steam, and is then discharged into the sea.

[0004] The cooling water channel has an intake port for taking in seawater and an outlet port for discharging seawater. From the perspective of environmental conservation, the temperature difference between the seawater taken in from the intake port and the seawater discharged from the outlet port (seawater temperature difference at the intake port) is required to be within a certain temperature range under an agreement with the local government near the sea. The seawater temperature difference at the intake port fluctuates depending on the temperature of the seawater at the intake port, even if the generator output is constant. For this reason, thermal power plants adjust the generator output so that the seawater temperature difference at the intake port is within a certain temperature range.

[0005] For example, Patent Document 1 discloses that the power output of a generator is controlled when the temperature difference between the intake water temperature and the discharge water temperature measured simultaneously at the intake and discharge ports is equal to or greater than a predetermined value.

[0006] Furthermore, Patent Document 2 discloses that in emergency control when at least one of the intake water temperature when seawater is taken in, the intake water discharge temperature difference, which is the temperature difference between the discharge temperature when seawater is discharged through a condenser and the aforementioned intake water temperature, and the average intake water discharge temperature difference, which is the average intake water discharge temperature difference on that day, satisfies emergency conditions, a control amount for the generator's power generation output is obtained according to a quick reference table that shows how much the intake water discharge temperature difference will change when the generator output is changed, and the power generation output is controlled by this control amount. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-200078 [Patent Document 2] JP 2017-31840 A Summary of the Invention [Problem to be solved by the invention]

[0008] Some thermal power plants use a single generator to generate electricity, while others use multiple generators. The latter type of facility, which uses multiple generators to generate electricity, is equipped with multiple surface condensers that exchange heat with the high-temperature, high-pressure steam generated after rotating multiple turbines that are coaxially connected to the generators. Opposite the multiple surface condensers, cooling water pipes through which seawater, the heat exchange fluid, flows are located in positions where heat exchange with the high-temperature, high-pressure steam is possible. Seawater taken in from the intake passes through the cooling pipes, exchanges heat with the high-temperature, high-pressure steam in the multiple surface condensers, and is then released from the discharge port.

[0009] Here, Patent Documents 1 and 2 control the power generation output of one generator, and in an installation such as the latter that has cooling piping spanning multiple surface condensers, it is not possible to selectively control the power generation output of any one of the multiple generators.

[0010] The present invention has been made in consideration of the above background, and aims to provide a temperature difference management support device and a temperature difference management support method that, in a power generation facility having multiple generators, are capable of adjusting the power generation output of at least one of multiple generators so that the temperature difference between the temperature of seawater taken into a cooling pipe and the temperature of seawater discharged from the cooling pipe is within a predetermined temperature difference. [Means for solving the problem]

[0011] One means for solving the above problem is a temperature difference management support device for managing and supporting a power generation facility including a plurality of generators, a plurality of condensers that cool and condense steam after rotating the plurality of generators, and cooling water pipes that have a single water intake port for taking in seawater and a single water discharge port for discharging the seawater and are arranged opposite the plurality of condensers so that the seawater exchanges heat with the steam, the temperature difference management support device managing and supporting a temperature difference between a first temperature when the seawater is taken in from the water intake port and a second temperature when the seawater is discharged from the water discharge port to be within a predetermined temperature difference, the temperature difference management support device including a determination unit that determines, based on a cumulative value of the temperature difference from a start time of a predetermined period to a current time, whether the temperature difference will be within the predetermined temperature difference when the plurality of generators are operated at an output at the current time during a remaining period of the predetermined period after the current time, and when the temperature difference is not within the predetermined temperature difference as a result of the determination by the determination unit, instructs the control unit to suppress the output of at least one of the plurality of generators so that the temperature difference will be within the predetermined temperature difference. and when the output of at least one of the plurality of generators is suppressed by a predetermined magnitude, a time for suppressing the output is specified so that the temperature difference falls within the predetermined temperature difference. an instruction unit for a display unit that displays a relationship between the outputs of the plurality of generators and the suppression time when the output of at least one of the plurality of generators is suppressed by a predetermined magnitude; Equipped with.

[0012] Other problems and solutions disclosed in the present application will be made clear in the detailed description and drawings. [Effects of the Invention]

[0013] According to the present invention, in a power generation facility having multiple generators, it is possible to adjust the power generation output of at least one of the multiple generators so that the temperature difference between the temperature of seawater taken into a cooling pipe and the temperature of seawater discharged from the cooling pipe is within a predetermined temperature difference. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram showing a schematic configuration of a power generation facility of a thermal power plant. [Figure 2] FIG. 2 is another diagram showing a schematic configuration of a power generation facility of a thermal power plant. [Figure 3] FIG. 2 is a diagram illustrating a hardware configuration of a temperature difference management support device. [Figure 4] 10 is a diagram showing an example of output from the temperature difference management support device 200. FIG. [Figure 5] FIG. 2 is a block diagram showing the functional configuration of a temperature difference management support device 200. [Figure 6] 10 is a flowchart showing the processing steps performed by the temperature difference management support device 200 during 24 hours of one day. DETAILED DESCRIPTION OF THE INVENTION

[0015] At least the following matters will become apparent from the description of this specification and the accompanying drawings. Hereinafter, the present invention will be described in accordance with one embodiment thereof with reference to the accompanying drawings.

[0016] ===Outline of thermal power plant=== Fig. 1 is a diagram showing a schematic configuration of a power generation facility of a thermal power plant. Fig. 2 is another diagram showing a schematic configuration of a power generation facility of a thermal power plant. The thermal power plant described below in this embodiment is assumed to be a facility that generates electricity using, for example, three generators. For ease of explanation, Fig. 1 is a diagram showing the structure for rotating one generator, and Fig. 2 is a diagram showing how cooling water channels are arranged opposite three condensers.

[0017] The thermal power plant 100 is configured to include three power generation facilities A, B, and C. Since the power generation facilities A, B, and C have the same configuration, only the power generation facility A will be described, and the same components within the power generation facilities A, B, and C will be given the same numbers and distinguished by adding A, B, and C to the end of the same numbers. Note that, for convenience of explanation, some components within the power generation facilities B and C are not shown even if they correspond to the components within the power generation facility A.

[0018] The power generation facility A includes a boiler 101A, a turbine 102A, a generator 103A, and a condenser 104A. An inlet for high-temperature, high-pressure steam of the condenser 104A and an outlet for cooled water of the condenser 104A are connected to each other outside the condenser 104A so that the water circulates through a heat exchange tube 105A. A fixed amount of water is sealed inside the heat exchange tube 105A when the heat exchange tube 105A is not heated.

[0019] Boiler 101A is connected to fuel tank 106, and heat exchange tubes 105A are housed in a combustion chamber 107A inside boiler 101A in a partially sealed state. The fuel in fuel tank 106 can be, for example, coal, petroleum, or liquefied natural gas. Boiler 101A combusts fuel supplied from fuel tank 106 in combustion chamber 107A, and transfers the heat obtained by this combustion to heat exchange tubes 105A inside combustion chamber 107A, converting the water inside heat exchange tubes 105A into high-temperature, high-pressure steam.

[0020] The turbine 102A is housed in a sealed state inside the side where high-temperature, high-pressure steam is generated from the boiler 101A, that is, the side where high-temperature, high-pressure steam is generated of the heat exchange tube 105A exposed from the boiler 101A. The turbine 102A includes blades 108A that receive high-temperature, high-pressure steam and a rotating shaft 109A at the center of the blades 108A. When the turbine 102A receives high-temperature, high-pressure steam passing through the heat exchange tube 105A, the blades 108A rotate around the rotating shaft 109A, thereby generating power.

[0021] The generator 103A is configured to include a rotor connected to the rotating shaft 109A of the turbine 102A, a stator having an iron core and coils, and a stator frame (none of which are shown) that supports the stator. The generator 103A generates electricity by rotating the rotor in response to the rotation of the rotating shaft 109A of the turbine 102A. The generator 103A outputs a current amount of power generation. This current amount of power generation may be, for example, a value that appears at the generating end of the generator 103A, or a value that appears at the transmitting end, which is the point where power is output from the thermal power plant 100 to the power transmission and distribution network. The value of this current amount of power generation is output from the generator 103A to a control computer device (not shown) of the thermal power plant 100. Alternatively, the value of this current amount of power generation may be output directly from the generator 103A to a control computer device of a power company that monitors the amounts of power generated by multiple power plants, including the thermal power plant 100, or may be output via the control computer device of the thermal power plant 100.

[0022] The condenser 104A cools the high-temperature, high-pressure steam that has rotated the blades 108A of the turbine 102A by heat exchange with seawater (described later) to return it to water, and outputs the cooled water to a heat exchange tube 105A that enters the boiler 101A. By reducing the volume of the high-temperature, high-pressure steam by returning it to water, the condenser 104A creates a high vacuum within the heat exchange tube 105A, improving the flow of high-temperature, high-pressure steam and ultimately improving the rotational efficiency of the turbine 102A. The water cooled by the condenser 104A is taken into the boiler 101A through the heat exchange tube 105A using a pump 110A installed midway between the heat exchange tube 105A that connects the boiler 101A and the output of the condenser 104A.

[0023] A branch pipe 114A (described later) of a cooling water pipe 111 through which seawater flows is arranged opposite to and in surface contact with the lower part of the condenser 104A so that high-temperature, high-pressure steam can be converted back into water by heat exchange with seawater in the condenser 104A. Specifically, the cooling water pipe 111 is composed of an intake pipe 112, a discharge pipe 113, and branch pipes 114A, 114B, and 114C. The intake pipe 112 is a pipe that takes in seawater from the sea. A pump 115 is installed in the middle of the intake pipe 112, and by driving the pump 115, seawater is taken in through an intake port 116 of the intake pipe 112. The branch pipes 114A, 114B, and 114C are pipes that branch off and extend from the side of the intake pipe 112 opposite the intake port 116. Branch pipes 114A, 114B, and 114C are disposed opposite to and in surface contact with the lower parts of condensers 104A, 104B, and 104C, respectively. The branch pipes 114A, 114B, and 114C merge into a water discharge pipe 113 on the side opposite to the side branched from water intake pipe 112. By providing such cooling water pipe 111 having one water intake port 116 and one water discharge port 117, heat exchange with high-temperature, high-pressure steam can be performed by the three condensers 104A, 104B, and 104C.

[0024] An intake water temperature sensor 118 is installed on the inner surface of the intake pipe 112 near the intake port 116, measuring the temperature of the seawater taken in from the intake port 116 (intake water temperature). In addition, a discharge water temperature sensor 119 is installed on the inner surface of the discharge pipe 113 near the discharge port 117, measuring the temperature of the seawater discharged from the discharge port 117 (discharge water temperature). The intake water temperature value measured by the intake water temperature sensor 118 and the discharge water temperature value measured by the discharge water temperature sensor 119 are output to, for example, a control computer device of the thermal power plant 100.

[0025] This control computer device receives the values ​​of the power generation amounts from the generators 103A, 103B, and 103C, the values ​​of the intake water temperature measured by the intake water temperature sensor 118, and the values ​​of the discharge water temperature measured by the discharge water temperature sensor 119, and stores these values ​​in association with the time of measurement. Furthermore, this control computer device stores the temperature difference between the intake water temperature and the discharge water temperature (the intake / discharge seawater temperature difference) at the same time based on the measurements of the intake water temperature sensor 118 and the discharge water temperature sensor 119 as logging data periodically recorded over time. This control computer device stores the logging data for each predetermined sampling interval, such as one minute. This sampling interval may be longer than one minute, such as five or ten minutes, or shorter than one minute, such as 30 seconds.

[0026] ===Hardware configuration of the temperature difference management support device=== Next, the hardware configuration of the temperature difference management support device according to this embodiment will be described below. Fig. 3 is a diagram showing the hardware configuration of the temperature difference management support device according to this embodiment.

[0027] The temperature difference management support device 200 can be installed, for example, in a thermal power plant 100 that needs to monitor the seawater temperature difference at the intake and discharge ports, which is the temperature difference between the intake temperature of seawater taken in from the intake port 116 and the discharge temperature of seawater discharged from the discharge port 117. In this case, the temperature difference management support device 200 may be an independent computer device, or may be realized by the control computer device of the thermal power plant 100. Furthermore, the temperature difference management support device 200 may be realized by the control computer device of a power company that monitors the power generation amounts of multiple power plants.

[0028] In Figure 3, the temperature difference management support device 200 is configured to include a CPU (Central Processing Unit) 201, a memory 202, and an input / output I / F (Interface) 203, and these CPU 201, memory 202, and input / output I / F 203 are connected via a bus 204.

[0029] The CPU 201 performs overall control of the temperature difference management support device 200. The memory 202 stores programs for realizing the functions of the temperature difference management support device 200 and data constituting various databases and the like used to realize the functions of the temperature difference management support device 200. In other words, the CPU 201 executes programs read from the memory 202 to acquire and calculate various values ​​(see FIG. 4) related to monitoring the seawater temperature difference at the water inlet and outlet, as a function of the temperature difference management support device 200.

[0030] The memory 202 stores logging data of the inlet / outlet seawater temperature difference as a single piece of data. When the temperature difference management support device 200 monitors the inlet / outlet seawater temperature difference at multiple power plants, the memory 202 stores the logging data of the inlet / outlet seawater temperature difference for each power plant. In this embodiment, multiple (three in this embodiment) generators 103A, 103B, and 103C are installed in one thermal power plant 100, but there is only one inlet 116 and one outlet 117. Therefore, the memory 202 chronologically stores only the logging data of the inlet / outlet seawater temperature difference applied to the seawater flowing through the inlet 116 and the outlet 117. Here, the memory 202 can be realized by appropriately selecting and using a read-only memory (ROM), a random access memory (RAM), a solid-state drive (SSD), a hard disk drive (HDD), etc.

[0031] The input / output I / F 203 transmits and receives data between the inside of the temperature difference management support device 200 and external devices. The input / output I / F 203 is an interface between, for example, the generators 103A, 103B, and 103C, the intake water temperature sensor 118, and the discharge water temperature sensor 119, and receives values ​​of the power generation amounts of the generators 103A, 103B, and 103C, the intake water temperature values, the discharge water temperature values, etc. The input / output I / F 203 may receive these values ​​directly, or may receive them via a control computer device of the thermal power plant 100.

[0032] The input / output I / F 203 is an interface with a display device equipped with a display screen, which is one of the external devices, and outputs various display information to the display device. The display information is, for example, information related to monitoring of the seawater temperature difference at the water intake and discharge ports by the temperature difference management support device 200, and specifically includes values ​​such as the water intake temperature, the water discharge temperature, and various calculation results based on the water intake temperature and the water discharge temperature, as well as commands for displaying these values ​​on the display screen of the display device.

[0033] Furthermore, the input / output I / F 203 is an interface with an input device (keyboard, numeric keypad, etc.), which is one of the external devices, and receives values ​​to be displayed on the display device, commands to instruct calculation, etc. from the input device.

[0034] Furthermore, when the temperature difference management support device 200 is provided independently from the control computer device of the thermal power plant 100, the input / output I / F 203 may be an interface that connects the inside of the temperature difference management support device 200 with an external device via a network such as the Internet. In this case, the input / output I / F 203 may be configured to receive, via the control computer device of the thermal power plant 100, the values ​​of the power generation amounts by the generators 103A, 103B, and 103C, the value of the intake water temperature measured by the intake water temperature sensor 118, the value of the discharge water temperature measured by the discharge water temperature sensor 119, and the like.

[0035] === Output example of temperature difference management support device 200 === Next, an example of outputting various pieces of display information to the display screen 300 of a display device using the temperature difference management support device 200 will be described. Fig. 4 is a diagram showing an example of output from the temperature difference management support device 200. As shown in Fig. 4, the temperature difference management support device 200 reads and executes a program for supporting temperature difference management stored in the memory 202, thereby outputting display information to be displayed on the display screen 300. The display screen 300 displays information A to U, which will be described below.

[0036] The "intake and discharge seawater temperature difference logging data cumulative value" of value A is a value obtained by accumulating the intake and discharge seawater temperature difference, which is the temperature difference between the temperature of seawater taken in from the intake 116 and the temperature of seawater discharged from the discharge 117, at regular intervals, i.e., the cumulative value of the intake and discharge seawater temperature difference logging data. For example, the cumulative value of the intake and discharge seawater temperature difference logging data is the cumulative value of the intake and discharge seawater temperature difference for 24 hours (predetermined period) from 0:00 to 24:00 every day.

[0037] Furthermore, the temperature difference management support device 200 acquires logging data of the inlet and outlet seawater temperature difference every hour on the hour, such as at 1:00 AM and 1:00 PM. The temperature difference management support device 200 acquires all of the inlet and outlet seawater temperature difference logging data for the day from midnight on the hour on the hour from the control computer device of the thermal power plant 100, and calculates a cumulative value of the inlet and outlet seawater temperature difference logging data. Alternatively, the temperature difference management support device 200 may acquire only the latest inlet and outlet seawater temperature difference logging data every hour on the hour, and add it to the cumulative value of the previous inlet and outlet seawater temperature difference logging data stored in memory 202 to calculate a cumulative value of the latest inlet and outlet seawater temperature difference logging data. Specifically, for example, if logging data of the inlet and outlet seawater temperature difference is acquired at 3:00 AM, and the logging data of the inlet and outlet seawater temperature difference at 1:00 AM is 7.1°C, the logging data of the inlet and outlet seawater temperature difference at 2:00 AM is 6.5°C, and the logging data of the inlet and outlet seawater temperature difference at 3:00 AM is 5.4°C, then the cumulative value of the inlet and outlet seawater temperature difference logging data at this time point is 19°C. The cumulative value of the inlet and outlet seawater temperature difference logging data calculated in this way is displayed in the value A column on the display screen 300.

[0038] The "current time" of value B is the time when the "cumulative logging data value of the seawater temperature difference at the water intake and discharge port" of value A is acquired. The current time is displayed on the display screen 300 as an integer indicating the hour. For example, if the hour when the "cumulative logging data value of the seawater temperature difference at the water intake and discharge port" of value A is acquired is 3:00 AM, the current time is displayed as "3" in the column for value B on the display screen 300.

[0039] The "instantaneous value of inlet / discharge seawater temperature difference" of value C refers to the value when the inlet / discharge seawater temperature difference is relatively stable among the constantly changing inlet / discharge seawater temperature differences. For this reason, the time when the "instantaneous value of inlet / discharge seawater temperature difference" of value C is measured may not coincide with the "current time" of value B, but for convenience, it is referred to as the instantaneous value of the inlet / discharge seawater temperature difference at the current time. For example, if the sampling time for logging data of the inlet / discharge seawater temperature difference is 30 seconds over a certain period (e.g., 5 minutes), and the variation in the inlet / discharge seawater temperature difference is stable within a certain value for 10 consecutive measurements, the temperature difference management support device 200 will display the inlet / discharge seawater temperature difference at that time as the "instantaneous value of inlet / discharge seawater temperature difference" in the value C field on the display screen 300. Furthermore, the temperature difference management support device 200 may calculate the average value of the inlet / outlet seawater temperature difference for this period and display this average value as the "instantaneous value of inlet / outlet seawater temperature difference" in the value C column of the display screen 300. Furthermore, when a graph is generated based on the logging data of the inlet / outlet seawater temperature difference, with the horizontal axis representing time and the vertical axis representing the inlet / outlet seawater temperature difference, a stable inlet / outlet seawater temperature difference can be identified when the inlet / outlet seawater temperature difference remains nearly substantially parallel to the horizontal axis for a predetermined period or longer.

[0040] The "Unit 1 output" of value D refers to the power generation output of generator 103A at the current time. Here, seawater for cooling high-temperature, high-pressure steam is taken in through intake 116, passes through branch pipe 114A, is used in heat exchange with high-temperature, high-pressure steam at a position opposite condenser 104A, and is then discharged from outlet 117. Therefore, the time when the seawater at the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired is used in heat exchange with high-temperature, high-pressure steam in condenser 104A, which is earlier than the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired. In other words, the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired arrives later than the time when the seawater is used in heat exchange with high-temperature, high-pressure steam in condenser 104A. Since the "instantaneous value of the inlet / outlet seawater temperature difference" of value C is the instantaneous value of the inlet / outlet seawater temperature difference at the current time, the power generation output of generator 103A at the current time needs to be the same value as the time when this instantaneous value of the inlet / outlet seawater temperature difference was acquired. Therefore, taking the above delay into consideration, the power generation output of generator 103A at the current time is the value at a time that is a predetermined time earlier than the time when the instantaneous value of the inlet / outlet seawater temperature difference was measured, and is displayed in the value D field on display screen 300. The predetermined time can be set appropriately by the administrator of temperature difference management support device 200, based on the distance of cooling water pipe 111 from condenser 104A to outlet 117, the diameter of cooling water pipe 111, the driving capacity of pump 115, etc.

[0041] Similarly, the "Unit 2 output" of value E refers to the power generation output of generator 103B at the current time. Here, seawater for cooling high-temperature, high-pressure steam is taken in through intake 116, passes through branch pipe 114B, is used in heat exchange with high-temperature, high-pressure steam at a position opposite condenser 104B, and is then discharged from outlet 117. Therefore, the time when the seawater at the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired is used in heat exchange with high-temperature, high-pressure steam in condenser 104B, which is earlier than the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired. In other words, the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired arrives later than the time when the seawater is used in heat exchange with high-temperature, high-pressure steam in condenser 104B. Since the "instantaneous value of the inlet / outlet seawater temperature difference" of value C is the instantaneous value of the inlet / outlet seawater temperature difference at the current time, the power generation output of generator 103B at the current time needs to be the same value as the time when this instantaneous value of the inlet / outlet seawater temperature difference was acquired. Therefore, taking the above delay into consideration, the power generation output of generator 103B at the current time is the value at a time that is a predetermined time earlier than the time when the instantaneous value of the inlet / outlet seawater temperature difference was measured, and is displayed in the value E field on display screen 300. The predetermined time can be appropriately set by the administrator of temperature difference management support device 200, based on the distance of cooling water pipe 111 from condenser 104B to outlet 117, the diameter of cooling water pipe 111, the driving capacity of pump 115, etc.

[0042] Similarly, the "Unit 3 output" of value F refers to the power generation output of generator 103C at the current time. Here, seawater for cooling high-temperature, high-pressure steam is taken in through intake 116, passes through branch pipe 114C, is used in heat exchange with high-temperature, high-pressure steam at a position opposite condenser 104C, and is then discharged from outlet 117. Therefore, the time when the seawater at the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired is used in heat exchange with high-temperature, high-pressure steam in condenser 104C, which is earlier than the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired. In other words, the time when the "instantaneous value of seawater temperature difference at intake and discharge port" of value C is acquired arrives later than the time when the seawater is used in heat exchange with high-temperature, high-pressure steam in condenser 104C. Since the "instantaneous value of the inlet / outlet seawater temperature difference" of value C is the instantaneous value of the inlet / outlet seawater temperature difference at the current time, the power generation output of generator 103C at the current time needs to be the same value as the time when this instantaneous value of the inlet / outlet seawater temperature difference was acquired. Therefore, taking the above delay into consideration, the power generation output of generator 103C at the current time is the value at a time that is a predetermined time earlier than the time when the instantaneous value of the inlet / outlet seawater temperature difference was measured, and is displayed in the value F field on display screen 300. The predetermined time can be set appropriately by the administrator of temperature difference management support device 200, based on the distance of cooling water pipe 111 from condenser 104C to outlet 117, the diameter of cooling water pipe 111, the driving capacity of pump 115, etc.

[0043] The "daily average temperature difference to be maintained" of value G refers to the target average value to be maintained throughout the day as the inlet / outlet seawater temperature difference, which is the difference between the temperature of seawater taken in through the inlet 116 and the temperature of seawater discharged through the outlet 117. Here, the upper limit of this inlet / outlet seawater temperature difference is determined by an agreement with the local government that manages the seawater, so the "daily average temperature difference to be maintained" is set to a value lower than the upper limit. For example, if the upper limit is 7°C, the "daily average temperature difference to be maintained" is set to a value that does not equal 7°C even when rounded off (e.g., 6.94°C), and is displayed in the value G field on the display screen 300. This setting allows for a margin of error even if the actual inlet / outlet seawater temperature difference fluctuates due to external factors such as weather. The "daily average temperature difference to be maintained" can be set as appropriate by the administrator of the temperature difference management support device 200.

[0044] The "temperature change rate per 1 MW of Unit 1" of value H refers to the rate of change (e.g., 0.003°C / MW) of the temperature difference at the intake and discharge seawater when generator 103A generates an output of 1 MW. The operation of determining the temperature change rate per 1 MW of generator 103A may be performed, for example, with the power generation of the other generators 103B and 103C stopped.

[0045] Furthermore, the "temperature change rate per 1 MW of Unit 2" of value I refers to the rate of change (e.g., 0.012°C / MW) of the temperature difference at the inlet / outlet seawater when generator 103B generates an output of 1 MW. The operation of determining the temperature change rate per 1 MW of generator 103B may be performed, for example, with the power generation of the other generators 103A and 103C stopped.

[0046] Furthermore, the "temperature change rate per 1 MW of Unit 3" of value J refers to the rate of change (e.g., 0.015°C / MW) of the temperature difference at the intake / discharge seawater when generator 103C generates an output of 1 MW. The operation of determining the temperature change rate per 1 MW of generator 103C may be performed, for example, with the power generation of the other generators 103A and 103B stopped.

[0047] The values ​​of the temperature change rates per 1 MW of Units 1, 2, and 3 thus determined are displayed, for example, via an input device, in the value H, I, and J columns of display screen 300. If the value H, I, and J columns of display screen 300 are left blank, data indicating constants (values ​​equivalent to the temperature change rates per 1 MW of each unit) that are stored and prepared in advance in, for example, memory 202 is read out and displayed in the value H, I, and J columns of display screen 300.

[0048] The "daily average temperature difference value when operation is continued at the current output" of value K refers to the predicted value of the average intake seawater temperature difference for one day (24 hours) if generators 103A, 103B, and 103C continue to operate for the remaining time until midnight on that day at the power generation outputs of values ​​D, E, and F (e.g., 285 MW, 156 MW, and 340 MW), respectively. Since the instantaneous value of the intake and discharge seawater temperature difference is determined when the power generation outputs of generators 103A, 103B, and 103C are the above values, the predicted value (value K) can be calculated by temperature difference management support device 200 by calculating the following formula (1) using the cumulative value of the logging data of the intake and discharge seawater temperature difference (value A), the current time (value B), and the instantaneous value of the intake and discharge seawater temperature difference at the current time (value C). The predicted value (value K) calculated by the formula (1) is then displayed in the value K field on the display screen 300.

[0049] K=(A+C(24-B)) / 24 (1) The "average temperature difference value for remaining time operation" of value L refers to the average value of the seawater temperature difference at the intake and discharge ports when generators 103A, 103B, and 103C are operated for the remaining time in order to achieve the "daily average temperature difference value to be maintained" of value G. This average value (value L) can be calculated by temperature difference management support device 200 by calculating the following formula (2) using the cumulative value (value A) of the logging data of the seawater temperature difference at the intake and discharge ports, the current time (value B), and the daily average temperature difference value to be maintained (value G). The average value (value L) calculated by formula (2) is then displayed in the value L field on display screen 300.

[0050] L = (24G - A) / (24 - B) (2) The "predicted temperature difference for the rated output of units 1, 2, and 3" of value M refers to the predicted value of the inlet / outlet seawater temperature difference when the power generation output of generators 103A, 103B, and 103C is at the rated output. Here, assuming that the rated outputs of generators 103A, 103B, and 103C are W1, W2, and W3, respectively, the predicted value (value M) can be calculated by temperature difference management support device 200 using the instantaneous value of the inlet / outlet seawater temperature difference (value C), the power generation outputs of generators 103A, 103B, and 103C (values ​​D, E, and F), and the temperature change rates of the inlet / outlet seawater temperature difference per MW of generators 103A, 103B, and 103C (values ​​H, I, and J) by calculating the following formula (3). The predicted value (value M) calculated by formula (3) is then displayed in the value M field on display screen 300.

[0051] M=C+(W1-D)H+(W2-E)I+(W3-F)J ···(3) In order to achieve the "daily average temperature difference to be maintained" of value G, the temperature difference management support device 200 compares the average value (value L) of the seawater temperature difference at the intake and discharge ports when the generators 103A, 103B, and 103C are operated for the remaining time with the instantaneous value (value C) of the seawater temperature difference at the intake and discharge ports, and determines whether the target daily average seawater temperature difference at the intake and discharge ports (value G) can be achieved if the generators 103A, 103B, and 103C continue to operate at their current power generation output.

[0052] N, "Determination of whether the current output is sufficient," refers to the result of this determination by the temperature difference management support device 200. For example, if the temperature difference management support device 200 determines, as a result of comparing the values ​​L and C, that the target daily average inlet seawater temperature difference (value G) cannot be achieved even if the current operating states of the generators 103A, 103B, and 103C are continued, a warning message such as "Load reduction required" is displayed in the N column on the display screen 300, indicating that it is necessary to reduce the power generation output of one of the generators 103A, 103B, and 103C.

[0053] The value O, "Unit 1 output to be changed," refers to the power generation output of generator 103A that is input by the administrator of temperature difference management support device 200 through the input device when a warning message such as "Load reduction required" is displayed in column N on display screen 300. If the power generation output of generator 103A is to be changed, the changed power generation output is input; on the other hand, if the power generation output of generator 103A is not to be changed, the power generation output displayed in column D on display screen 300 can be input as is.

[0054] The "output of Unit 2 to be changed" in value P refers to the power generation output of generator 103B that is input by the administrator of temperature difference management support device 200 via the input device when a warning message such as "load suppression required" is displayed in column N on display screen 300. If the power generation output of generator 103B is to be changed, the changed power generation output is input; on the other hand, if the power generation output of generator 103B is not to be changed, the power generation output displayed in column E on display screen 300 can be input as is.

[0055] The "Unit 3 output to be changed" of value Q refers to the power generation output of generator 103C that is input by the administrator of temperature difference management support device 200 via the input device when a warning message such as "Load reduction required" is displayed in column N on display screen 300. If the power generation output of generator 103C is to be changed, the changed power generation output is input; on the other hand, if the power generation output of generator 103C is not to be changed, the power generation output displayed in column F on display screen 300 can be input as is.

[0056] In this embodiment, the temperature difference management support device 200 determines whether the above load suppression is possible by reducing only the power generation output of the generator 103C, for example, from a power generation output of 340 MW to a power generation output of 175 MW.

[0057] By inputting the above values ​​O, P, and Q, the temperature difference management support device 200 determines how long the power generation output of generator 103C should be continuously suppressed when operating at the power generation output of generators 103A, 103B, and 103C indicated by values ​​O, P, and Q in order to achieve the target daily average inlet and outlet seawater temperature difference (value G).

[0058] The value R is the time for which the power generation output of the generator 103C is suppressed, calculated by the temperature difference management support device 200, on the premise that the power generation output of the generator 103C will be restored to the power generation output before the suppression. This suppression time is displayed in the value R field on the display screen 300.

[0059] Furthermore, S is the result of the determination by the temperature difference management support device 200 as to whether the daily average inlet and outlet seawater temperature difference of value G can be achieved if the power generation output of generator 103C is suppressed for the suppression time of value R, then returned to the power generation output before the suppression, and operation continues together with the remaining generators 103A and 103B until midnight on the day. If the temperature difference management support device 200 determines that the daily average inlet and outlet seawater temperature difference of value G can be achieved, a message such as "Temperature difference can be maintained" is displayed in the S column on the display screen 300.

[0060] The value T is the time for which the power generation output of the generator 103C is suppressed, calculated by the temperature difference management support device 200, on the premise that the post-suppression power generation output will be the rated output after the power generation output of the generator 103C is suppressed. This suppression time is displayed in the value T field on the display screen 300.

[0061] Furthermore, U is the result of the determination by the temperature difference management support device 200 as to whether the daily average inlet and outlet seawater temperature difference of value G can be achieved if the power generation output of generator 103C is suppressed for a suppression time of value T and then returned to rated output, and operation continues together with the remaining generators 103A and 103B until midnight on the day. If the temperature difference management support device 200 determines that the daily average inlet and outlet seawater temperature difference of value G can be achieved, a message such as "Temperature difference can be maintained" is displayed in the U column on the display screen 300.

[0062] Here, the instantaneous value of the seawater temperature difference at the intake and discharge ports, value C, is obtained in units of 0.1°C, and the power generation output values ​​for which changes are planned for generators 103A, 103B, and 103C, values ​​O, P, and Q, can be set in units of 1 MW, so by using the temperature difference management support device 200, precise management of the seawater temperature difference at the intake and discharge ports can be performed.

[0063] The upper part of display screen 300 displays the information A through U described above. The lower part of display screen 300 displays the power output of generators 103A, 103B, and 103C on a graph with the horizontal axis representing time (midnight to midnight of the current day) and the vertical axis representing power output (MW). For example, the power output of generator 103A is rated at 285 MW (solid line), the power output of generator 103B is rated at 156 MW (dashed line), and the power output of generator 103C is shown as being reduced from rated output 340 MW to reduced output 175 MW for a predetermined period of time (e.g., 3.8 hours) before returning to the rated output (dashed line). From this graph, the administrator of temperature difference management support device 200 can intuitively understand the reduction in the power output of generator 103C.

[0064] In this embodiment, the case where the power generation output of generator 103C is suppressed is described, but this is not limited to this. The power generation output of other generators 103A and 103B may be suppressed individually, or the power generation output of a generator consisting of a combination of any two or more of generators 103A, 103B, and 103C may be suppressed.

[0065] Functional Configuration of Temperature Difference Management Support Device 200 Next, a description will be given of the functional configuration of the temperature difference management support device 200. FIG.

[0066] 5, the temperature difference management support device 200 includes an input unit 401, a storage unit 402, a calculation unit 403, an output unit 404 (instruction unit), and a determination unit 405.

[0067] 4 is input to the input unit 401 from the control computer device of the thermal power plant 100. The information on the values ​​A to J is stored in the storage unit 402, and in particular, the information on the values ​​A and C to F is stored in the storage unit 402 in association with information indicating the date and time. The information on the values ​​A to J is output from the output unit 404 and displayed in the columns for the values ​​A to J on the display screen 300 of the display device, which is one of the external devices.

[0068] The calculation unit 403 calculates a predicted value (value K) of the average inlet seawater temperature difference for one day (24 hours) if the generators 103A, 103B, and 103C continue to operate at the power generation outputs shown in the columns D, E, and F, respectively, for the remaining time until midnight of the day. The calculation unit 403 also calculates the average value (value L) of the inlet seawater temperature difference if the generators 103A, 103B, and 103C are operated for the remaining time to achieve the "daily average temperature difference to be maintained" shown in the column G. The calculation unit 403 also calculates a predicted value (value M) of the inlet seawater temperature difference if the power generation outputs of the generators 103A, 103B, and 103C become the rated output. These calculation results (values ​​K, L, and M) are output from the output unit 404 and displayed in the columns K, L, and M on the display screen 300 of the display device.

[0069] The determination unit 405 determines whether or not the target daily average seawater temperature difference at the intake and discharge ports (value G) can be achieved if operation of the generators 103A, 103B, and 103C continues at their current power output, based on the result of comparing the average seawater temperature difference at the intake and discharge ports (value L) with the instantaneous value of the seawater temperature difference at the intake and discharge ports when the generators 103A, 103B, and 103C are operated for the remaining time in order to achieve the "daily average temperature difference to be maintained" of value G. The result of this determination is output from the output unit 404 and displayed in the value N field on the display screen 300 of the display device.

[0070] When the judgment result by the judgment unit 405 indicates that the power generation output of any of the generators 103A, 103B, and 103C needs to be temporarily suppressed, the input unit 401 uses this judgment result as a trigger to accept the setting of values ​​O, P, and Q as the power generation output of the generators 103A, 103B, and 103C, including the suppression of the power generation output.

[0071] The calculation unit 403 calculates the suppression time for the power output of the generator to be suppressed, assuming that after suppressing the power output of one of the generators 103A, 103B, and 103C, the power output of the generator to be suppressed will be returned to the power output before the suppression. At this time, the determination unit 405 determines whether the daily average inlet / outlet seawater temperature difference of value G can be achieved if the power output of the generator to be suppressed is suppressed for the suppression time calculated by the calculation unit 403, then returned to the power output before the suppression, and operation continues until midnight on the day together with other generators not to be suppressed. The suppression time calculated by the calculation unit 403 and the determination result by the determination unit 405 are output from the output unit 404 and displayed in the R and S columns on the display screen 300 of the display device, respectively.

[0072] The calculation unit 403 also calculates the suppression time for the power generation output of the generator to be suppressed, assuming that after the power generation output of one of the generators 103A, 103B, and 103C is suppressed, the post-suppression power generation output of the generator to be suppressed will be set to the rated output. At this time, the determination unit 405 determines whether or not the daily average inlet / outlet seawater temperature difference of value G can be achieved if the power generation output of the generator to be suppressed is suppressed for the suppression time calculated by the calculation unit 403, then set to the rated output, and continued operation together with other generators not to be suppressed until midnight on the day. The suppression time calculated by the calculation unit 403 and the determination result by the determination unit 405 are output from the output unit 404 and displayed in the T and U columns on the display screen 300 of the display device, respectively.

[0073] ===Processing Procedure of Temperature Difference Management Support Device 200=== Next, a description will be given of the processing procedure of the temperature difference management support apparatus 200. Fig. 6 is a flowchart showing the processing procedure that the temperature difference management support apparatus 200 performs over 24 hours in one day.

[0074] First, the temperature difference management support apparatus 200 ends the series of processes when 12:00 PM arrives through the processing of step S518, which will be described later. However, since the arrival of midnight also marks the arrival of midnight, the temperature difference management support apparatus 200 executes the processing of step S501, triggered by the arrival of midnight. That is, the temperature difference management support apparatus 200 determines whether the hour on the hour has arrived (S501). If the hour on the hour has not arrived (S501: NO), the temperature difference management support apparatus 200 waits until the hour on the hour arrives, such as 1:00 AM or 1:00 PM.

[0075] When the hour arrives (S501: YES), the temperature difference management support apparatus 200 acquires the current time (value B) (S502). For example, if it is 1:00 AM, 1:00 is acquired as the current time, and if it is 1:00 PM, 1:00 is acquired as the current time.

[0076] Next, the temperature difference management support device 200 acquires a cumulative value (value A) of the logging data of the inlet / outlet seawater temperature difference at the current time acquired in step S502 (S503). For example, if the inlet / outlet seawater temperature difference at 1:00 is 7.1°C, 7.1°C is acquired as this cumulative value. Furthermore, if the current time is 3:00, the temperature difference management support device 200 acquires a cumulative value of the logging data of the three inlet / outlet seawater temperature differences at 1:00, 2:00, and 3:00. For example, if the inlet / outlet seawater temperature difference at 1:00 is 7.1°C, the inlet / outlet seawater temperature difference at 2:00 is 6.5°C, and the inlet / outlet seawater temperature difference at 3:00 is 5.4°C, 19°C (=7.1 + 6.5 + 5.4) is acquired as this cumulative value.

[0077] Next, the temperature difference management support device 200 acquires the instantaneous value (value C) of the inlet / outlet seawater temperature difference at the current time (S504). For example, after the hour arrives, the inlet / outlet seawater temperature difference that has been stable continuously for a predetermined period (e.g., five minutes) is acquired as the instantaneous value of the inlet / outlet seawater temperature difference at the current time. Alternatively, the average value of the inlet / outlet seawater temperature difference over this predetermined period may be acquired as the instantaneous value of the inlet / outlet seawater temperature difference at the current time.

[0078] Next, temperature difference management support device 200 acquires the power generation outputs (values ​​D, E, F) of generators 103A, 103B, 103C at a time point a predetermined time prior to the time point at which the instantaneous value of the seawater temperature difference at the inlet and outlet ports was measured at the current time in step S504 as the power generation outputs of generators 103A, 103B, 103C at the current time (S505). This makes it possible to acquire power generation outputs that take into account the delay from the time point at which the seawater was used for heat exchange with high-temperature, high-pressure steam in condensers 104A, 104B, 104C at the time point at which the instantaneous value of the seawater temperature difference at the inlet and outlet ports was measured at the current time.

[0079] Next, the temperature difference management support device 200 acquires the daily average temperature difference (value G), which is the target average value to be maintained throughout the day as the seawater temperature difference at the water intake and discharge ports (S506). The daily average temperature difference is set to a value lower than the upper limit of the seawater temperature difference at the water intake and discharge ports determined by an agreement with the local government that manages the seawater.

[0080] Next, the temperature difference management support device 200 acquires the rate of change (values ​​H, I, J) of the seawater temperature difference at the water intake and discharge ports when the generators 103A, 103B, and 103C each generate an output of 1 MW (S507).

[0081] Here, the processing of steps S502 to S507 only needs to be performed before proceeding to processing of step S508 and subsequent steps, which will be described later, and the order of the processing of steps S502 to S507 does not matter.

[0082] Next, the temperature difference management support device 200 calculates the predicted value (value K) of the average intake seawater temperature difference for one day (24 hours) if the generators 103A, 103B, and 103C continue to operate at the power generation outputs in the values ​​D, E, and F columns, respectively, for the remaining time until midnight on that day, using equation (1) (S508).

[0083] Next, the temperature difference management support device 200 calculates the average value (value L) of the seawater temperature difference at the intake and discharge ports when the generators 103A, 103B, and 103C are operated for the remaining time in order to achieve the "daily average temperature difference value to be maintained" of value G by calculating formula (2) (S509).

[0084] Next, the temperature difference management support device 200 calculates the predicted value (value M) of the seawater temperature difference at the water intake and discharge ports when the power generation outputs of the generators 103A, 103B, and 103C reach the rated output, by calculating equation (3) (S510).

[0085] Then, in order to achieve the "daily average temperature difference value to be maintained" of value G, the temperature difference management support device 200 compares the average value (value L) of the seawater temperature difference at the intake and discharge ports when the generators 103A, 103B, and 103C are operated for the remaining time with the instantaneous value (value C) of the seawater temperature difference at the intake and discharge ports, and determines whether the target daily average seawater temperature difference at the intake and discharge ports (value G) can be achieved if the generators 103A, 103B, and 103C continue to operate at their current power generation output, i.e., whether it is necessary to suppress the power generation output of any of the generators 103A, 103B, and 103C (S511). If the target daily average inlet / outlet seawater temperature difference (value G) can be achieved by continuing operation of generators 103A, 103B, and 103C at their current power generation output, that is, if there is no need to suppress the power generation output of any of generators 103A, 103B, and 103C (S511: NO), proceed to processing in step S518, which will be described later.

[0086] On the other hand, if the target daily average inlet / outlet seawater temperature difference (value G) cannot be achieved without suppressing the power generation output of any of the generators 103A, 103B, and 103C (S511: YES), the temperature difference management support device 200 displays a warning message, such as "Load suppression required," in the N column of the display screen 300, indicating that it is necessary to suppress the power generation output of at least one of the generators 103A, 103B, and 103C (S512).

[0087] Next, in response to the output of the warning message in step S512, the temperature difference management support device 200 receives input (values ​​O, P, Q) of the power generation output of the generators 103A, 103B, 103C to be changed, which will reduce the power generation output of any one of the generators 103A, 103B, 103C (S513). For example, the power generation outputs of the three generators 103A, 103B, 103C are received, indicating that the power generation outputs of the generators 103A, 103B will not be changed, and only the power generation output of the generator 103C will be reduced from 340 MW to 175 MW.

[0088] Next, the temperature difference management support device 200 calculates the time (value R) for suppressing the power output of the generator 103C to 175 MW, assuming that the power output of the generator 103C will be suppressed from 340 MW to 175 MW and then returned to the pre-suppression power output of 340 MW (S514). This suppression time is displayed in the R column on the display screen 300. Furthermore, if the power output of the generator 103C is suppressed for the suppression time of value R, and then returned to the pre-suppression power output, and operation continues together with the remaining generators 103A and 103B until midnight on the day, and if the daily average inlet / outlet seawater temperature difference of value G can be achieved, the temperature difference management support device 200 displays a message such as "Temperature difference can be maintained" in the S column on the display screen 300 (S515).

[0089] Furthermore, assuming that the power generation output of generator 103C is reduced from 340 MW to 175 MW and then the reduced power generation output of 175 MW is to be increased to the rated output, temperature difference management support device 200 calculates the time (value T) for reducing the power generation output of generator 103C to 175 MW (S516). This reduction time is displayed in the T column on display screen 300. Furthermore, if the power generation output of generator 103C is reduced for the reduction time of value T and then increased to the rated output, and operation continues together with the remaining generators 103A and 103B until midnight on the day, and if the daily average inlet / outlet seawater temperature difference of value G can be achieved, temperature difference management support device 200 displays a message such as "Temperature difference can be maintained" in the U column on display screen 300 (S517).

[0090] Next, the temperature difference management support apparatus 200 determines whether 12:00 PM has arrived, which is the hourly time (S518). If 12:00 PM has not arrived (S518: NO), the process returns to step S501. If 12:00 PM has already arrived (S518: YES), the process for the 24-hour day is terminated.

[0091] As described above, the temperature difference management support device 200 according to this embodiment is equipped with power generation facilities A, B, and C including three generators 103A, 103B, and 103C, condensers 104A, 104B, and 104C that cool and condense high-temperature, high-pressure steam after rotating the three generators, and cooling water pipe 111 that has one water intake 116 for taking in seawater and one water discharge 117 for discharging seawater and is arranged opposite the three condensers so that the seawater exchanges heat with the high-temperature, high-pressure steam, and the temperature difference between the seawater intake and discharge ports, which is the temperature difference between the temperature of the seawater taken in from the water intake port 116 and measured by the intake water temperature sensor 118, and the temperature of the seawater discharged from the water discharge port 117 and measured by the discharge water temperature sensor 119, is a value G. This device manages and supports the temperature difference so that it remains within a "daily average temperature difference to be maintained." Based on the cumulative value of logging data of the inlet / outlet seawater temperature difference from the start time (12:00 AM) of a predetermined period (24 hours) to the current time, it determines whether the inlet / outlet seawater temperature difference will be within a predetermined temperature difference if three generators 103A, 103B, and 103C are operated at their output power at the current time for the remaining period after the current time. If the inlet / outlet seawater temperature difference is not within the predetermined temperature difference, it instructs, according to the flowchart of Figure 6, to temporarily suppress the power generation output of at least one of the three generators 103A, 103B, and 103C so that the inlet / outlet seawater temperature difference remains within the predetermined temperature difference. While this embodiment has been described as operating three generators, the temperature difference management support device 200 can also be used in thermal power plants with more generators. In this way, in a thermal power plant equipped with multiple generators, by selectively suppressing the power generation output of the multiple generators, it is possible to always maintain the seawater temperature difference at the intake and discharge ports within the temperature difference specified in the agreement with the local government.

[0092] Furthermore, the power output suppression time may be the time required for the power output of the generator that is the target of power output suppression to be restored to the output before the suppression after being suppressed for that suppression time, or the power output suppression time may be the time required for the power output of the generator that is the target of power output suppression to be restored to the rated output of the generator after being suppressed for that suppression time. This allows the manager of the temperature difference management support device 200 to select either of the suppression times depending on the operating status of the generators in the thermal power plant 100, the margin between the current seawater temperature difference at the intake and discharge port and the temperature difference specified in the agreement with the local government, etc.

[0093] Furthermore, the time for which the power generation output of a generator that is the target of power generation output suppression is suppressed may be correlated with the power generation output of the generator after the suppression and displayed on the display screen 300. This allows the administrator of the temperature difference management support device 200 to easily understand the power generation state of the generator when the power generation output is suppressed.

[0094] The above-described embodiments are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and equivalents thereof are also included in the present invention. [Explanation of symbols]

[0095] 100 Thermal Power Plants 101A Boiler 102A Turbine 103A Generator 104A, 104B, 104C Condensers 105A heat exchange tube 106 Fuel Tank 107A Combustion chamber 108A Feather 109A Rotating shaft 110A pump 111 Cooling water pipe 112 Water intake pipe 113 Water pipe 114A, 114B, 114C branch pipes 115 Pump 116 Water Intake 117 Outlet 118 Water intake temperature sensor 119 Discharge water temperature sensor 200 Temperature difference management support device 201 CPU 202 memory 203 Input / Output Interface 204 Bus 300 display screen 401 Input section 402 Storage section 403 Calculation Unit 404 Output Section 405 Judgment Department

Claims

1. A power generation facility including a plurality of generators, a plurality of condensers that cool and condense steam after rotating the plurality of generators, and a cooling water pipe having a single water intake port for taking in seawater and a single water discharge port for discharging the seawater, the cooling water pipe being arranged opposite the plurality of condensers so that the seawater exchanges heat with the steam, the temperature difference management support device managing and supporting a temperature difference between a first temperature when the seawater is taken in from the water intake port and a second temperature when the seawater is discharged from the water discharge port to be within a predetermined temperature difference, a determination unit that determines, based on a cumulative value of the temperature difference from a start time of a predetermined period to a current time, whether or not the temperature difference will be within the predetermined temperature difference when the plurality of generators are operated at the output at the current time for a remaining period of the predetermined period after the current time; an instruction unit that, when the determination unit determines that the temperature difference is not within the predetermined temperature difference, instructs to suppress the output of at least one of the plurality of generators so that the temperature difference is within the predetermined temperature difference, and instructs, when the output of at least one of the plurality of generators is suppressed by a predetermined magnitude, a time for suppressing the output so that the temperature difference is within the predetermined temperature difference; a display unit that displays a relationship between the outputs of the plurality of generators and the suppression time when the output of at least one of the plurality of generators is suppressed by a predetermined magnitude; A temperature difference management support device comprising:

2. The temperature difference management support device according to claim 1, the cooling water pipe includes a water intake pipe having the water intake port, a water discharge pipe having the water discharge port, and a plurality of branch pipes connected between the water intake pipe and the water discharge pipe, The plurality of branch pipes branch off from the water intake pipe, are arranged at positions opposite the plurality of condensers, and merge into the water discharge pipe. Temperature difference management support device.

3. The temperature difference management support device according to claim 1, The output suppression time is the time required to restore the output of the generator to its pre-suppression output after the output of the generator has been suppressed for the suppression time. Temperature difference management support device.

4. The temperature difference management support device according to claim 1, The output suppression time is the time required to restore the output of the generator whose output is to be suppressed to the rated output of the generator after suppressing the output for the suppression time. Temperature difference management support device.

5. A temperature difference management support method for a power generation facility including a plurality of generators, a plurality of condensers that cool and condense steam after rotating the plurality of generators, and a cooling water pipe having a single water intake port for taking in seawater and a single water discharge port for discharging the seawater, the cooling water pipe being arranged opposite the plurality of condensers so that the seawater exchanges heat with the steam, the method comprising: determining whether the temperature difference will be within the predetermined temperature difference range when the plurality of generators are operated at the output at the current time for the remaining period of the predetermined period from the current time onward, based on the cumulative value of the temperature difference from the start time of the predetermined period to the current time; When the determination result of the determination unit indicates that the temperature difference is not within the predetermined temperature difference, an instruction is given to suppress an output of at least one of the plurality of generators so that the temperature difference is within the predetermined temperature difference, and when the output of at least one of the plurality of generators is suppressed by a predetermined magnitude, an instruction is given to suppress the output for a time period such that the temperature difference is within the predetermined temperature difference; When the output of at least one of the plurality of generators is suppressed by a predetermined amount, the relationship between the output of the plurality of generators and the suppression time is displayed. Temperature difference management support method.

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