JP6620445B2 - Intake and discharge water temperature difference management method and intake and discharge water temperature difference management equipment - Google Patents

Description

  The present invention relates to an intake / discharge water temperature difference management method and an intake / discharge water temperature difference management facility for managing a temperature difference between intake water temperature and discharge temperature of cooling water (seawater) in a thermal power plant or a nuclear power plant.

  In a thermal power plant, a nuclear power plant, etc., electric power is generated by rotating a turbine (impeller) of a generator by the pressure of high-temperature and high-pressure steam evaporated by heat of thermal power or nuclear power. In order to rotate the turbine, a pressure difference of water vapor needs to exist before and after the turbine. The larger the pressure difference, the higher the thermal efficiency of the turbine. In addition, a condenser is installed on the downstream side of the turbine in the steam path of the power plant, and the steam that rotates the turbine is rapidly cooled by the condenser, liquefied, and returned to water. And the water liquefied with the condenser is sent to a boiler, a nuclear reactor, etc. through a water supply pipe, is again heated, turns into water vapor, and is repeatedly used for power generation.

  This condenser uses seawater taken from the sea around the power plant as cooling water, and the cooling water absorbs latent heat generated when the steam contacts the piping, thereby cooling the steam and condensing it. In addition, the cooling water used in the condenser is discharged into the sea, but the temperature of the cooling water is rising because it removes latent heat from high-temperature steam. That is, the temperature of the cooling water and seawater (water discharge temperature) when the water is discharged into the sea is higher than the temperature of the cooling water (water intake temperature) during the intake from the sea.

  The temperature difference between the intake temperature and the discharge temperature (intake / discharge temperature difference) is constant according to the environmental conservation agreement (pollution prevention agreement) concluded between the power generation company and the local government from the viewpoint of environmental protection. The agreed value is determined and managed and maintained to be below this agreed value. However, in actual operation, for example, a sudden drop in the temperature of seawater near the water intake may cause a situation where the temperature difference between intake and discharge exceeds the agreed value.

  As a measure in such a case, the heat load of the condenser is reduced by lowering the power generation output to lower the amount of steam, thereby reducing the temperature difference between intake and discharge water. Specifically, the current intake water discharge temperature difference (instantaneous temperature difference) and the average daily intake water discharge temperature difference when this instantaneous temperature difference continues throughout the day are calculated. Next, based on the calculated daily average intake and discharge temperature difference and the target daily average intake and discharge temperature difference, the time at which the load is suppressed, and the amount of change in the intake and discharge temperature difference per unit load. The amount is calculated, and the power generation output is decreased by this amount of suppression.

  On the other hand, as a measure to prevent the difference in intake and discharge water temperature from exceeding the agreed value, the temperature of the intake seawater and tides are monitored and the temperature and tides exceed a certain range. In addition, a technique is known that predicts a difference in intake and discharge water temperature and issues an alarm or reduces the power generation output when the difference exceeds an agreed value (for example, Patent Documents 1 and 2).

JP 2010-121564 A JP 2011-002127 A

  By the way, due to seasonal radiative cooling, tide level, flowing water from rivers, etc., the intake temperature (seawater temperature) may drop sharply. In such a case, it is necessary to drop the power generation output quickly. However, conventionally, when the power generation output is lowered, the suppression amount is calculated as described above, so it takes time until the power generation output is lowered. There was a risk of exceeding.

  On the other hand, in the techniques of Patent Documents 1 and 2, since it is difficult to predict the difference in intake and discharge water temperature and accurate prediction is impossible, the power generation output is not lowered when it is unnecessary, or the power generation output is not lowered when necessary. May occur. In addition, when the intake water temperature suddenly decreases suddenly, the power generation output cannot be reduced rapidly to prevent the intake / discharge water temperature difference from exceeding the agreed value.

  Therefore, the present invention provides a management method for intake and discharge water temperature difference and a difference in intake and discharge water temperature that can prevent the intake and discharge water temperature difference from exceeding the agreed value even when the intake water temperature changes abruptly. The purpose is to provide management facilities.

In order to solve the above problems, the invention of claim 1 is characterized in that a water intake temperature when seawater is taken as cooling water from the sea at a power plant, and a water discharge temperature when cooling water is discharged into the sea through a condenser. Intake and discharge water temperature difference management method for managing the difference in temperature as intake and discharge water temperature difference, measuring the intake water temperature and discharge water temperature to calculate the intake and discharge water temperature difference, and based on the intake and discharge water temperature difference on the day An average intake / discharge temperature difference that is an average intake / discharge temperature difference is calculated, and during normal control, at least one of the intake temperature, the intake / discharge temperature difference, and the average intake / discharge temperature difference satisfies the first condition, A control amount of the power generation output is calculated according to a predetermined calculation method, the power generation output is controlled by the control amount, and at least one of the intake water temperature, the intake water discharge temperature difference, and the average intake water discharge temperature difference is a second condition. Meet emergency control during As a first emergency control step, preparative the number varying the power output indicating water discharge temperature difference changes many times, to obtain the control amount of the electric power output in accordance with Chart, after having controlled the power generation output only the control amount Thus, as a second emergency control step, a control amount of the power generation output is calculated according to a predetermined calculation method, and the power generation output is controlled to an appropriate value by controlling only the control amount .

  According to the present invention, when at least one of the intake water temperature difference, the intake water discharge temperature difference, and the average intake water discharge temperature difference is a good value and the control of the power generation output is required, the control amount of the power generation output is set according to a predetermined calculation method. The power generation output is controlled by this control amount. On the other hand, if at least one of intake water temperature difference, intake water discharge temperature difference and average intake water discharge temperature difference is an abnormal value and emergency control of power generation output is required, the control amount of power generation output is calculated according to the quick reference table. Only control the power output.

According to a second aspect of the invention, the collected water discharge temperature difference management method according to claim 1, when the emergency control, the follow quick reference, instantaneous temperature difference which is a temperature difference between the water discharge temperature and the intake temperature measured at the same time Determine how much power generation output should be reduced to make the value below the predetermined value, or control the temperature difference between the discharge water temperature and the intake water temperature measured a predetermined time before the measurement of the discharge water temperature. It is characterized by determining and controlling how much the power generation output should be lowered in order to make the average seawater temperature difference, which is the average value of the day, equal to or less than a predetermined value .

  A third aspect of the present invention is the intake / discharge water temperature difference management method according to the first or second aspect, wherein the quick reference table is created based on past performance values.

  The invention of claim 4 is the intake and discharge water temperature difference management method according to claims 1 to 3, wherein the intake and discharge water temperature difference includes an instantaneous temperature difference that is a temperature difference between the discharge water temperature and the intake water temperature measured simultaneously, And a management temperature difference that is a temperature difference between the water discharge temperature and a water intake temperature measured a predetermined time before the water discharge temperature is measured.

The invention of claim 5 relates to a temperature difference between a water intake temperature when seawater is taken as cooling water from the sea at a power plant and a water discharge temperature when water is discharged into the sea through a condenser. Intake water temperature difference management equipment managed as a difference, water intake temperature measuring means for measuring the water intake temperature, water discharge temperature measuring means for measuring the water discharge temperature, water intake temperature measured by the water intake temperature measuring means, The temperature at which the difference in intake and discharge water is calculated from the discharge water temperature measured by the discharge water temperature measuring means, and the average intake and discharge temperature difference that is the average intake and discharge temperature difference of the day is calculated based on the difference in intake and discharge temperature. Display means for displaying a difference calculation means, a calculation result by the temperature difference calculation means, and a quick reference table showing how many times the difference in the discharged water temperature changes when the power generation output is changed, and the intake water temperature The temperature difference between the intake and discharge water And a control amount of power generation output is calculated according to a predetermined calculation method during normal control in which at least one of the average intake / discharge water temperature difference satisfies the first condition, and the intake water temperature, the intake / discharge water temperature difference, and the average intake / discharge water during at least one of the temperature difference is the second condition is satisfied emergency control, after performing the control based on the previous SL quick reference to the first emergency control step, a second emergency control step, according to a predetermined calculation method The control amount of the power generation output for controlling the power generation output to an appropriate value is calculated.

According to the first aspect of the present invention, in the case of urgent necessity, the control amount is acquired according to the quick reference table to control the power generation output, and therefore the control amount is calculated according to a predetermined calculation method to control the power generation output. Compared to the case, the power generation output can be quickly controlled. As a result, even if the intake water temperature changes abruptly, it is possible to quickly control and suppress the power generation output and prevent the intake / discharge water temperature difference from exceeding the agreed value. According to the first aspect of the invention, the power generation output is controlled by calculating the control amount according to a predetermined calculation method after controlling the power generation output by the control amount according to the quick reference table. For this reason, the power generation output is controlled promptly in an emergency to ensure that the difference in intake and discharge water temperature does not exceed the agreed value, and then the power generation output is controlled to an appropriate value to secure more power generation output. It becomes possible to do.

  On the other hand, when an emergency is not required, the power generation output is controlled by calculating the control amount in accordance with a predetermined calculation method. Therefore, the power generation output can be controlled by a more appropriate and accurate control amount. As a result, it is possible to prevent the difference in intake and discharge water temperature from exceeding the agreed value while ensuring more power generation output (without excessive suppression).

According to the invention described in claim 2, the mean sea temperature difference or how much the power output it is only necessary to drop indexed to below a predetermined value of the instantaneous temperature difference in accordance with Chart below a predetermined value To do so, it is determined how much power generation output should be reduced . Therefore, the Rukoto quickly Gyosu control the power output to the instantaneous temperature difference and mean sea temperature difference below a predetermined value becomes possible in an emergency.

  According to the invention described in claim 3, since the quick reference table is created based on the past actual value, it is possible to control the power generation output by an appropriate control amount based on the actual result. As a result, it is possible to more reliably prevent the intake / discharge water temperature difference from exceeding the agreed value, and it is possible to secure more power generation output without excessively suppressing the power generation output.

  According to the fourth aspect of the present invention, the intake / discharge water temperature difference includes not only the instantaneous temperature difference but also the management temperature difference, so that a more appropriate intake / discharge water temperature difference can be calculated. That is, instead of comparing the water intake temperature and the water discharge temperature at the same time point (current time) as in the past, the water discharge temperature is considered in consideration of the time until the cooling water drawn from the water intake is discharged from the water discharge port. The temperature difference for management is calculated based on the water intake temperature measured before the measurement. For this reason, it becomes possible to calculate the temperature difference of how much the cooled cooling water has been discharged and discharged as a management temperature difference, and it is possible to calculate a more appropriate intake / discharge water temperature difference. For this reason, for example, even if the temperature of the seawater at the intake port suddenly decreases, the temperature difference for management is calculated as to how much the low-temperature cooling water / seawater has been discharged and discharged, exceeding the agreed value It becomes possible to prevent / suppress more. As a result, the necessity for adjusting the heat load (power generation output) of the condenser is reduced, and stable power generation (power generation with high power generation efficiency) becomes possible.

  According to invention of Claim 5, since a quick reference table is displayed on a display means with an intake / discharge water temperature difference and an average intake / discharge water temperature difference, an intake / discharge water temperature difference or an average intake / discharge water temperature difference is an abnormal value and requires an emergency. In this case, it is possible to quickly control the power generation output as in the first aspect of the invention by obtaining the control amount by looking at the quick reference table.

It is a schematic block diagram showing the intake / discharge water temperature difference management facility for carrying out the intake / discharge water temperature difference management method according to this embodiment. It is a schematic diagram which shows the electric power generation unit to which the intake / discharge water temperature difference management method of FIG. 1 is applied. It is a figure which shows the monitoring result by the intake / discharge water temperature difference management method of FIG. It is a figure which shows the quick reference table in the intake / discharge water temperature difference management method of FIG. It is a figure which shows the seawater temperature difference calculation sheet | seat in the intake / discharge water temperature difference management method of FIG.

  The present invention will be described below based on the illustrated embodiments.

  FIGS. 1-5 shows embodiment of this invention, FIG. 1 is a schematic block diagram which shows the intake / discharge water temperature difference management equipment 1 for implementing the intake / discharge water temperature difference management method concerning this embodiment. It is. This intake / discharge water temperature difference management method and facility 1 is used in a power plant including a thermal power plant and a nuclear power plant, when the sea water is taken from the sea as the cooling water W, the cooling water through the condenser 104 and the like. The temperature difference from the water discharge temperature when water is discharged into the sea is managed as the intake water discharge temperature difference. The intake water discharge temperature difference management equipment 1 is mainly composed of an intake water thermometer (water intake temperature measuring means) 2, a water discharge thermometer (water discharge temperature measuring means) 3, a management computer (environmental monitoring instrument) 4, and a seawater temperature difference calculation sheet. The water intake thermometer 2 and the water discharge thermometer 3 are connected to the management computer 4 in a communicable manner.

  Here, the intake water discharge temperature difference includes the instantaneous temperature difference that is the difference between the discharge water temperature and the intake water temperature measured at the same time, and the intake water temperature measured a predetermined time before the discharge water temperature is measured. Temperature difference for management which is a temperature difference.

  First, the flow of the steam S1 and the cooling water W will be briefly described. As shown in FIG. 2, the steam S <b> 1 generated by the boiler 101 is sent to the turbine 102 to rotate the turbine 102, and power is generated by the generator 103 connected to the turbine 102. The steam S1 that has passed through the turbine 102 is condensed by the condenser 104 to become power generation water S2, and is sent to the boiler 101 by the first pump 105 to become steam S1 again.

  On the other hand, seawater in the sea is taken as cooling water W from the water intake 106 by the second pump 108 and sent to the condenser 104. Then, the cooling water W rises in temperature by cooling the steam S1 in the condenser 104 and condensing it, and is discharged from the water outlet 107 into the sea. In this embodiment, it is assumed that three such power generation units are provided.

  The intake thermometer 2 is a thermometer that measures the intake temperature of the cooling water W. That is, the temperature of the cooling water (seawater) W that is disposed around the water intake 106 and is taken from the water intake 106 is always measured in real time, and the measurement result is transmitted to the management computer 4.

  The water discharge thermometer 3 is a thermometer that measures the water discharge temperature of the cooling water W. That is, the temperature of the cooling water W disposed around the water outlet 107 and discharged from the water outlet 107 into the sea is always measured in real time, and the measurement result is transmitted to the management computer 4.

  The management computer 4 is disposed in a management room that manages and controls each power generation unit. As shown in FIG. 1, the management computer 4 mainly includes a storage unit (storage unit) 41, a temperature difference calculation unit (temperature difference calculation unit) 42, and , A display (display means) 43, and a central processing unit 44 for controlling them.

  The storage unit 41 is a memory that stores the water intake temperature measured by the water intake thermometer 2 in time series. That is, the intake temperature measured by the intake thermometer 2 is sequentially stored and accumulated together with the measurement date and time.

  The temperature difference calculation unit 42 calculates the intake water temperature difference from the water intake temperature measured by the water intake thermometer 2 and the water discharge temperature measured by the water discharge thermometer 3, and the average of the day based on the water intake temperature difference It is a task program that calculates an average intake / discharge temperature difference, which is a typical intake / discharge temperature difference. At this time, the temperature difference between the water discharge temperature and the water intake temperature simultaneously measured by the water discharge thermometer 3 and the water intake thermometer 2 is calculated as an instantaneous temperature difference, and the water discharge temperature measured by the water discharge thermometer 3 A temperature difference from the intake water temperature measured by the intake water thermometer 2 and stored in the storage unit 41 a predetermined time before the discharge water temperature is calculated as a management temperature difference.

  The display 43 displays the calculation result by the temperature difference calculation unit 42, the quick reference table C, and the like. That is, the temperature difference calculation unit 42 sequentially calculates an instantaneous temperature difference, a management temperature difference, and the like in real time, and displays the calculation result on the display 43.

  Specifically, the monitoring result R as shown in FIG. 3 is sequentially acquired and calculated in real time and displayed on the display 43. The monitoring result R includes the generator output R1 of each power generation unit (each unit). , Intake port instantaneous temperature R2, intake port management temperature R3, discharge port instantaneous temperature R4, instantaneous temperature difference R5, management temperature difference R6, expected seawater average temperature difference R7, average seawater temperature difference R8, and emergency load suppression guideline R9 including.

  The generator output R1 indicates the current (current) power generation output of the generator 103, is received from the system that monitors and controls the power generation unit, is acquired, and displayed. The water intake instantaneous temperature R2 indicates the current water intake temperature measured by the water intake thermometer 2, is received from the water intake thermometer 2, acquired, and displayed. The intake management temperature R3 indicates the intake temperature measured by the intake thermometer 2 a predetermined time before the present time, and is acquired from the storage unit 41 and displayed.

  Here, the predetermined time is set based on the time required for the cooling water W taken from the water intake port 106 to be discharged from the water discharge port 107. That is, the intake port management temperature R3 indicates how many times the cooling water W discharged from the discharge port 107 was taken from the intake port 106. Specifically, it is set in advance based on past actual measurement values or simulations. In the case of simulation, the time required for the cooling water W taken from the water intake port 106 to be discharged from the water discharge port 107 is calculated based on the route through which the cooling water W passes, the passing speed, and the like, and this time is calculated for a predetermined time. Set as.

  The water outlet instantaneous temperature R4 indicates the current water discharge temperature measured by the water discharge thermometer 3, is received from the water discharge thermometer 3, acquired, and displayed. Here, in this embodiment, three power generation units take cooling water W from the same water intake 106, and the water intake instantaneous temperature R2 and the water intake management temperature R3 have the same value in all power generation units. . On the other hand, the water outlet 107 is different in each power generation unit, and the water outlet instantaneous temperature R4 and the following instantaneous temperature difference R5 and the like have different values for each power generation unit.

  The instantaneous temperature difference R5 is a temperature difference between the water discharge temperature and the water intake temperature currently (simultaneously) measured by the water discharge thermometer 3 and the water intake thermometer 2, and is calculated and displayed by the following equation.

  Instantaneous temperature difference R5 = outlet instantaneous temperature R4-intake instantaneous temperature R2

  This instantaneous temperature difference R5 indicates a temperature difference between the water discharge temperature and the water intake temperature at the present time.

  The management temperature difference R6 is a temperature difference between the current water discharge temperature measured by the water discharge thermometer 3 and the water intake temperature measured by the water intake thermometer 2 a predetermined time before the time of measurement (current) of the water discharge temperature. It is calculated and displayed by the following formula.

  Management temperature difference R6 = Water outlet instantaneous temperature R4-Intake management temperature R3

  This management temperature difference R6 indicates how much the temperature of the taken cooling water W has risen and discharged through the condenser 104 and the like.

  Estimated seawater average temperature difference (average intake and discharge water temperature difference) R7 is the current (current) average temperature difference (management temperature difference) when the current management temperature difference R6 continues from the present (current time) to 24:00. R6 average value), which is calculated and displayed by the following equation.

Expected seawater average temperature difference R7 = ("average value of management temperature difference R6 up to the current day" x "elapsed time to date of current day" + "current temperature difference R6 for management" x "until 24:00 on that day Remaining time ”) ÷“ day time ”
Here, “time of day” = 24 hours × 60 minutes = 1440 minutes.

  The average seawater temperature difference (average intake and discharge water temperature difference) R8 is an average value of the management temperature difference R6 up to the present day, and is calculated and displayed by the following equation.

  Average seawater temperature difference R8 = “Average value of outlet instantaneous temperature R4 to date of current day” − “Average value of intake port management temperature R3 to date of current day”

  Here, it has been concluded that the temperature difference between the intake water temperature and the discharge temperature (intake water discharge temperature difference) is equal to or less than the agreed value between the power generation company and the local government. That is, the instantaneous / temporary intake / discharge temperature difference is equal to or less than a predetermined value M1 (for example, 10 ° C.), and the average daily intake / discharge temperature difference is the predetermined value M2 (M2 <M1, for example, 7 ° C.). It must be the following. In this embodiment, the management temperature difference R6 corresponds to an instantaneous / temporary intake / discharge temperature difference, and the average seawater temperature difference R8 corresponds to an average intake / discharge temperature difference for one day.

  The emergency load suppression guideline R9 is information indicating a rough relationship between the amount of change in the power generation output and the amount of change in the discharge water temperature (intake / discharge water temperature difference). In this embodiment, the unit is based on the past actual value. Indicates the amount of decrease in intake and discharge water temperature difference when the load is lowered by the output. For example, the decrease temperature of the intake and discharge water temperature difference (instantaneous temperature difference R5, management temperature difference R6) when the power generation output is lowered by 10 MW is shown.

  This emergency load suppression standard R9 is set in advance based on past actual measurement values, simulations, and the like. Further, in this embodiment, the emergency load suppression guideline R9 for Unit 1 and Unit 2 is the same value, and is different from the emergency load control guideline R9 for Unit 3.

  The quick reference table C is a load suppression quick reference table showing how many times the difference in intake and discharge water temperature changes when the power generation output (load) is changed, and is created based on past performance values. That is, as shown in FIG. 4, the output change amount is such that when the power generation output is lowered by 25 MW, the intake water discharge temperature difference decreases, or when the power generation output is reduced by 50 MW, the intake water discharge temperature difference decreases. The amount of temperature change for each is shown. The values of the output change amount and the temperature change amount in this quick reference table C are approximate values obtained by simplifying the calculation results obtained from the seawater temperature difference calculation sheet described later, and are less accurate than the calculation results obtained from the seawater temperature difference calculation sheet. . Further, since the seawater temperature difference calculation sheet is calculated based on the past actual value, the quick reference table C is also created based on the past actual value.

  The seawater temperature difference calculation sheet is installed on a general-purpose computer and, according to a predetermined calculation method (calculation formula) based on past actual values, the control amount (load) of the power generation output is set so that the average seawater temperature difference R8 is not more than a predetermined value. A software program for calculating (quantity). That is, a seawater temperature difference calculation sheet as shown in FIG. 5 is displayed on the display 43 and is sequentially calculated based on the input predetermined parameters.

  First, based on the input “current time”, “average seawater temperature difference” (R8), “instantaneous seawater temperature difference” (R6), “unit load”, daily average seawater temperature difference prediction (expected seawater average temperature) The difference R7) is calculated and displayed. In addition, based on the input “target value of daily average seawater temperature difference”, “time to start load suppression”, and “change in seawater temperature difference relative to load”, average seawater at the end date and time (at the end of the day) A load amount / output value of the power generation output for calculating the temperature difference R8 to be equal to or smaller than the “daily average seawater temperature difference target value” or less is calculated.

  Here, the “target value of the daily average seawater temperature difference” may be set to the predetermined value M2 or lower than the predetermined value M2. “Seawater temperature difference change relative to load” is the temperature change of intake / discharge water temperature difference (water discharge temperature) per unit load change, and the past actual value of each power generation unit is stored, and the power generation unit is selected. It is possible to input by doing.

  Then, in order to make the average seawater temperature difference R8 equal to or less than the “daily average seawater temperature difference target value” or less, the number of power generation outputs should be determined as “the time when load suppression starts” and “the seawater temperature relative to the load”. It is calculated based on the “difference change amount”. Any calculation procedure may be used. For example, “load suppression start” is necessary to make the daily average seawater temperature difference R8 equal to or less than the “daily average seawater temperature difference target value”. The average intake and discharge water temperature difference after “time to perform” is calculated, and then the power generation output value for making this intake and discharge water temperature difference is calculated. As described above, the load amount is calculated as the control amount, but the change amount / suppression amount of the power generation output may be calculated as the control amount.

  Here, the seawater temperature difference calculation sheet of FIG. 5 illustrates that when the power generation output is lowered, there is a predetermined time lag before the intake / discharge water temperature difference decreases. As a result, it is possible to more appropriately determine and input, for example, when to set the "time to start load suppression" and what should be set to "the target value of the daily average seawater temperature difference". . In this embodiment, the load amount when load suppression is started at a time later than the input “time to start load suppression” by a predetermined time (for example, one hour) is also calculated and displayed as a reference. As a result, it is possible to control the power generation output at a more appropriate time and load.

  Next, an intake / discharge water temperature difference management method using the intake / discharge water temperature difference management facility 1 having such a configuration will be described.

  First, the water intake temperature is always measured in real time by the water intake thermometer 2 (water intake temperature measuring step), the water intake temperature is stored in the storage unit 41 of the management computer 4 in time series (memory step), and the water discharge thermometer 3 is used. The water discharge temperature is measured (water discharge temperature measurement step). Subsequently, the instantaneous temperature difference R5, the management temperature difference R6, the predicted seawater average temperature difference R7, and the average seawater temperature difference R8 are sequentially calculated by the temperature difference calculating unit 42 as described above ( The temperature difference calculation step), the calculation result / monitoring result R and the quick reference table C are displayed on the same screen of the display 43 (display step).

  In this state, a predetermined calculation method during normal control satisfying the first condition with at least one of the intake water temperature difference, intake water discharge temperature difference (R5, R6) and average intake water discharge temperature difference (R7, R8). The control amount of the power generation output is calculated according to the control amount, and the power generation output is controlled by the control amount (normal control process). That is, in this embodiment, when the instantaneous temperature difference R5 exceeds a predetermined threshold value, the management computer 4 issues an alarm, receives the alarm, activates a seawater temperature difference calculation sheet, inputs a predetermined parameter, and loads And the power generation output is controlled to this load amount with a predetermined permission.

  Here, in this embodiment, the power generation output is controlled by transmitting a control command (including a load amount and a control amount) to a system that monitors and controls the power generation unit instead of directly controlling the power generation unit. .

  On the other hand, at least one of intake water temperature, intake / discharge water temperature difference (R5, R6) and average intake / discharge water temperature difference (R7, R8) is an abnormal value and satisfies the second condition, which is more sudden than normal control. When necessary, the control output power generation amount is acquired according to the quick reference table C, and the power generation output is controlled by the control amount with a predetermined permission (first emergency control step). That is, in this embodiment, when the average seawater temperature difference R8 becomes equal to or greater than a predetermined threshold, the management computer 4 issues an alarm, receives this alarm, acquires the control amount of the power generation output according to the quick reference table C, and performs the control. Controls the power output by the amount. At this time, for example, according to the quick reference table C and the instantaneous temperature difference R5, it is determined and controlled how much the power generation output should be lowered to make the instantaneous temperature difference R5 equal to or less than a predetermined value (desired value). Alternatively, according to the quick reference table C and the average seawater temperature difference R8, it may be determined and controlled how much the power generation output should be lowered in order to make the average seawater temperature difference R8 below a predetermined value (desired value).

  Subsequently, after controlling the power generation output by the control amount according to the quick reference table C, the control amount of the power generation output is calculated according to a predetermined calculation method, and the power generation output is controlled by the control amount (second emergency control step). . That is, as in the normal control step, the load amount is calculated by the seawater temperature difference calculation sheet, and the power generation output is controlled to this load amount.

  As described above, in this embodiment, the normal control is performed when the instantaneous temperature difference R5 is equal to or larger than the predetermined threshold, and the emergency control is performed when the average seawater temperature difference R8 is equal to or larger than the predetermined threshold. When the condition is satisfied, normal control or emergency control may be performed. For example, when the intake temperature, the management temperature difference R6, and the predicted seawater average temperature difference R7 reach a predetermined value, or when the temperature change rate of the seawater reaches a predetermined value or more, normal control or emergency control is performed. It may be. Alternatively, normal control may be performed when the instantaneous temperature difference R5 is equal to or greater than the first threshold value L1, and emergency control may be performed when the instantaneous temperature difference R5 is equal to or greater than the second threshold value L2 (L1 <L2).

  As described above, according to this intake and discharge water temperature difference management method, when urgent is required, the control amount is obtained according to the quick reference table C and the power generation output is controlled, so the control amount is calculated by the seawater temperature difference calculation sheet. As compared with the case where the power generation output is controlled, the power generation output can be controlled more quickly. As a result, even if the intake water temperature changes abruptly, the power generation output is quickly controlled / suppressed, and the difference in intake / discharge water temperature (instantaneous / temporary intake / discharge water temperature difference and average daily) It is possible to prevent exceeding the agreed value).

  On the other hand, during normal control that does not require an emergency, the control output is calculated by controlling the seawater temperature difference calculation sheet and the power generation output is controlled. Therefore, the power generation output can be controlled by a more appropriate and accurate control amount. As a result, it is possible to prevent the difference in intake and discharge water temperature from exceeding the agreed value while ensuring more power generation output (without excessive suppression).

  Furthermore, after controlling the power generation output by the control amount according to the quick reference table C, the control amount is calculated by the seawater temperature difference calculation sheet to control the power generation output. For this reason, the power generation output is controlled promptly in an emergency to ensure that the difference in intake and discharge water temperature does not exceed the agreed value, and then the power generation output is controlled to an appropriate value to secure more power generation output. It becomes possible to do.

  Moreover, since the quick reference table C is created based on the past actual values, it is possible to control the power generation output by an appropriate control amount based on the actual results. As a result, it is possible to more reliably prevent the intake / discharge water temperature difference from exceeding the agreed value, and it is possible to secure more power generation output without excessively suppressing the power generation output.

  On the other hand, since the intake temperature difference includes not only the instantaneous temperature difference R5 but also the management temperature difference R6, a more appropriate intake / discharge temperature difference can be calculated. That is, instead of comparing the water intake temperature and the water discharge temperature at the same time point (current time) as in the past, the time until the cooling water W taken from the water intake port 106 is discharged from the water discharge port 107 is taken into consideration. The management temperature difference R6 is calculated based on the intake water temperature measured before the time of measuring the water discharge temperature. For this reason, it becomes possible to calculate the temperature difference of how much the cooled cooling water W has been heated and discharged as the management temperature difference R6, and it is possible to calculate a more appropriate intake and discharge water temperature difference. Become. For this reason, for example, even when the temperature of the seawater at the intake port 106 suddenly decreases, a management temperature difference R6 indicating how much the low-temperature cooling water W has risen and discharged is calculated, and the agreed value is obtained. It is possible to prevent or suppress the excess. As a result, the necessity for adjusting the heat load (power generation output) of the condenser 104 is reduced, and stable power generation (power generation with high power generation efficiency) becomes possible.

  Further, according to the intake and discharge water temperature difference management facility 1, the quick reference table C is displayed on the same screen of the display 43 together with the monitoring result R of the instantaneous temperature difference R5 and the average seawater temperature difference R8. For this reason, when it is confirmed that the average seawater temperature difference R8 or the like is an abnormal value on the display 43, the control amount can be quickly acquired by looking at the quick reference table C on the same screen of the display 43. As a result, as described above, it is possible to quickly control the power generation output and prevent the intake / discharge water temperature difference from exceeding the agreed value.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, both the instantaneous temperature difference R5 and the management temperature difference R6 are calculated and managed as the discharge water temperature difference, but only one of them may be calculated and managed. Moreover, although the seawater temperature difference calculation sheet is provided in the general-purpose computer, it may be provided in the management computer 4.

1 Intake and discharge temperature difference management system 2 Intake thermometer (Intake temperature measurement means)
3 Water discharge thermometer (water discharge temperature measurement means)
4 management computer 41 storage section (storage means)
42 Temperature difference calculation part (temperature difference calculation means)
43 Display (display means)
104 Condenser 106 Water intake 107 Water outlet W Cooling water (seawater)
C quick reference

Claims (5)

Intake and discharge temperature that manages the temperature difference between the intake temperature when seawater is taken as cooling water from the sea at the power plant and the discharge temperature when cooling water is discharged into the sea via a condenser as the intake and discharge temperature difference. A difference management method,
Calculate the intake and discharge temperature difference by measuring the intake temperature and discharge temperature, and calculate the average intake and discharge temperature difference that is the average intake and discharge temperature difference of the day based on the intake and discharge temperature difference,
During normal control in which at least one of the intake water temperature, the intake water discharge temperature difference, and the average intake water discharge temperature condition satisfies the first condition, a control amount of the power generation output is calculated according to a predetermined calculation method, and only the control amount is calculated. Control power generation output,
At the time of emergency control in which at least one of the intake water temperature, the intake water discharge temperature difference, and the average intake water discharge temperature condition satisfies the second condition, as a first emergency control step, the number of power generation outputs is changed to change the intake water discharge temperature difference. After obtaining the control amount of the power generation output according to the quick reference table showing how many times it changes, and controlling the power generation output by the control amount, as a second emergency control step, control of the power generation output according to a predetermined calculation method Calculate the amount, and control the power generation output to an appropriate value by controlling only the control amount,
Intake and discharge water temperature difference management method characterized by that. During the emergency control, according to the quick reference table,
Determine how much power generation output should be reduced to control the instantaneous temperature difference, which is the temperature difference between the water discharge temperature and the intake water temperature measured at the same time, to be below a predetermined value.
Or, to reduce the average seawater temperature difference, which is the average value of the temperature difference between the water discharge temperature measured on the day before the water discharge temperature and the water intake temperature measured a predetermined time before the time of measurement, how much the power generation output is reduced. To determine and control what to do,
The intake / discharge water temperature difference management method according to claim 1. The quick reference table is created based on past performance values,
The intake / discharge water temperature difference management method according to any one of claims 1 and 2. The intake water discharge temperature difference includes the instantaneous temperature difference between the water discharge temperature measured simultaneously and the water intake temperature, and the temperature difference between the water discharge temperature and the water intake temperature measured a predetermined time before the water discharge temperature is measured. Including a management temperature difference,
The intake / discharge water temperature difference management method according to any one of claims 1 to 3. Intake and discharge temperature that manages the temperature difference between the intake temperature when seawater is taken as cooling water from the sea at the power plant and the discharge temperature when cooling water is discharged into the sea via a condenser as the intake and discharge temperature difference. Difference management equipment,
Water intake temperature measuring means for measuring the water intake temperature;
Water discharge temperature measuring means for measuring the water discharge temperature;
The intake water temperature difference is calculated from the water intake temperature measured by the water intake temperature measuring means and the water discharge temperature measured by the water discharge temperature measuring means, and the average water intake and discharge temperature of the day based on the water intake and discharge temperature difference. A temperature difference calculating means for calculating an average intake water discharge temperature difference which is a difference;
Display means for displaying a calculation result by the temperature difference calculating means, and a quick reference table showing how many times the power discharge output changes the intake / discharge water temperature difference;
With
During normal control in which at least one of the intake water temperature, the intake water discharge temperature difference, and the average intake water discharge temperature difference satisfies the first condition, a control amount of the power generation output is calculated according to a predetermined calculation method,
The intake temperature, at least one second condition is satisfied emergency control of the intake water discharge temperature difference and the average intake water discharge temperature difference, after performing control based on the previous SL quick reference to the first emergency control step As a second emergency control step, according to a predetermined calculation method, a control amount of the power generation output for controlling the power generation output to an appropriate value is calculated.
Intake and discharge water temperature difference management equipment.

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