JP4990848B2 - Monitoring system - Google Patents

Description

  The present invention relates to a monitoring system and a monitoring method for monitoring changes in a monitoring target.

  There are various types of monitoring of changes in the monitoring target, such as dust monitoring in a clean room and radiation monitoring in a medical field. In a thermal power plant, for example, there is monitoring of a temperature difference of cooling water sent to a condenser. In each power generation unit of a thermal power plant, steam used for rotational driving of the turbine is recovered and returned to water for reuse. For this purpose, a condenser is used. The condenser cools the steam that has worked to rotate the turbine with seawater (cooling water) sucked at the intake port. And the seawater heat-exchanged with the steam is returned to the sea from the outlet.

  At this time, in order to prevent the discharged seawater (cooling water) from affecting the coastal environment, the difference between the temperature of the seawater at the intake and the temperature of the seawater at the outlet is less than 7 ° C. It is prescribed. In the thermal power plant, the opening degree of the rotor blades of the circulation pump for sucking seawater is controlled so that the temperature difference does not exceed the specified value of 7 ° C.

In addition to the control of the moving blades, there is a system in which a heat recovery device that keeps the temperature difference of discharged water at 7 ° C. or less is provided on the discharge side of the condenser (see, for example, Patent Document 1).
JP-A-8-21205

  By the way, in order to prevent the temperature difference of intake water from exceeding a specified value, the system described above requires a dedicated device for recovering heat on the discharge side of the condenser. In order not to use a dedicated device, the opening degree of the moving blades of the circulation pump is controlled, but at this time, the temperature difference data that indicates whether the temperature difference is increasing or decreasing is obtained. It is necessary for the person in charge to judge. For this reason, the burden of the person in charge who performs analysis work increases.

  An object of the present invention is to provide a monitoring system and a monitoring method capable of solving the above-described problems and automatically monitoring a change in a monitoring target such as a temperature.

In order to solve the above-mentioned problem, the invention of claim 1 is directed to the discharge water temperature so that the average value of the temperature difference between the intake water temperature and the discharge water temperature of the power plant does not exceed a specified value in a preset monitoring time . a monitoring system for monitoring a storage device that records the temperature difference at predetermined time intervals, a time zone back any time from the current time, a plurality of arbitrary time zone back up at the monitoring time in the average value of the temperature difference, the calculated with reference to the storage device, selects the maximum of the average value from among the mean values calculated, the beginning of any time slot in which the maximum average value is selected The average value of the temperature difference from the current time to the non-elapsed time so that the average value of the temperature difference from the time to the non-elapsed time that is the time when the monitoring time elapses does not exceed the specified value, in front A processor for calculating and maximum average value based on a monitoring system, characterized in that it comprises a.

In the invention of claim 1, the storage device records the temperature difference between the water intake temperature and the water discharge temperature of the power plant at regular time intervals. The processing device is a time zone that goes back an arbitrary time from the current time , and in a plurality of arbitrary time zones that go back up to the monitoring time, the average value of the temperature difference is calculated with reference to the storage device, and each average calculated Select the largest average value from the values. Then, from the current time so that the average value of the temperature difference from the start time of the arbitrary time zone in which the maximum average value is selected to the non-elapsed time that is the time when the monitoring time elapses does not exceed the specified value. The average value of the temperature difference until the non-elapsed time is calculated based on the maximum average value.

According to the first aspect of the present invention, average values of temperature differences are calculated in a plurality of arbitrary time zones , and the maximum average value is selected from the average values . In each arbitrary time zone, for example, if the current time is “13:00”,
“12:50” to “13:00”
“12:40” to “13:00”
Thus , since the maximum average value in each arbitrary time zone is automatically selected , it becomes possible to monitor the change of the monitoring target with the maximum average value without the need for analysis by the person in charge.

Furthermore, it is necessary to prevent the average value of temperature differences from the start time of the arbitrary time period when the maximum average value is selected to the time when the monitoring time elapses from exceeding the specified value. The average value of the temperature difference from the current time to the non-elapsed time is output. Thereby, the countermeasure for suppressing the average value lower than the specified value can be automatically provided without the analysis by the person in charge. In particular, since necessary countermeasures are automatically output, rapid response is possible.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, the difference between the temperature of the seawater taken in at the intake port of the thermal power plant and the temperature of the seawater released from the water discharge port is the monitoring target.

(Embodiment 1)
A monitoring system according to this embodiment is shown in FIG. The monitoring system 1 includes a data collection server 10, a monitoring terminal 20, and a device control device 30. The data collection server 10, the monitoring terminal 20, and the device control device 30 are in a state where data can be transmitted and received through the in-house network NW formed in the thermal power plant.

  What is monitored in this embodiment is the temperature difference of the cooling water used in the condenser of the thermal power plant. Here, the intake and discharge system of the thermal power plant where the condenser is installed will be described. For example, in the intake / discharge system 100 shown in FIG. 2, the intake port 110 and the discharge port 120 are connected by a conduit 130. A circulation pump 140 and a condenser 150 are installed in the pipeline 130. The condenser 150 exchanges heat between the steam that has driven the turbine 160 and the seawater that is the cooling water, and returns the steam to the water for recovery. Thereafter, the condenser 150 sends the returned water to a boiler (not shown). Thereby, the water which returned the steam is reused.

  The circulation pump 140 sucks the seawater required for the condenser 150 from the intake port 110 and flows it to the condenser 150 via the conduit 130. Then, the seawater whose temperature has been increased by heat exchange by the circulation pump 140 is caused to flow toward the water discharge port 120 through the pipeline 130. At this time, the temperature difference between seawater at the time of intake and discharge is regulated so as not to affect the coastal environment. In other words, the thermal power plant manages the temperature difference so that the average value of the temperature difference at an arbitrary monitoring time does not exceed the specified value. Specifically, it is necessary to monitor the temperature of seawater at the time of water discharge in a thermal power plant so that the average value of the temperature difference for an arbitrary 60 minutes (monitoring time) does not exceed 7 ° C. (specified value). If the temperature difference seems to exceed the specified value, the opening of the moving blade (not shown) of the circulation pump 140 is controlled to increase the flow rate of seawater.

  For this purpose, in the water intake / discharge system 100, temperature sensors 170 and 180 are installed at the water intake 110 and the water outlet 120, and the temperatures of the water intake 110 and the water outlet 120 are measured. The temperature sensors 170 and 180 output measurement signals a and b representing temperature measurement results.

  The data collection server 10 of the monitoring system 1 collects and stores the measurement signals a and b from the temperature sensors 170 and 180. The data collection server 10 takes in the measurement results represented by the measurement signals a and b every minute, for example, and stores them as temperature accumulation data. Thereby, the data collection server 10 memorize | stores the seawater temperature taken in from the water intake 110, and the seawater temperature discharged from the water outlet 120. FIG. Furthermore, the data collection server 10 calculates and stores the difference between the two temperatures. The temperature accumulation data stored in the data collection server 10 is shown in FIG. In this temperature accumulation data, the temperature is continuously recorded every minute for every day. The monitoring system 1 stores such temperature accumulation data for each power generation unit for a predetermined period. FIG. 3 shows the temperature accumulation data of the No. 1 unit of the two units.

  The monitoring system 1 monitors the temperature difference of seawater between the water intake 110 and the water discharge port 120, and includes a processing unit 21, a storage unit 22, a communication unit 23, an input unit 24, a display unit 25, and an output unit 26. I have. The storage unit 22 to the output unit 26 are connected to the processing unit 21 via the bus 27. The communication unit 23 enables data communication with the local network NW under the control of the processing unit 21. Accordingly, the processing unit 21 can communicate with the data collection server 10 and the device control device 30. The input unit 24 is an input device operated by a person in charge such as a keyboard and a mouse. The display unit 25 is a display device such as an LCD (Liquid Crystal Display) that displays data. The display unit 25 displays a monitoring result, which will be described later, under the control of the processing unit 21. The output unit 26 is an output device that prints out monitoring results and the like under the control of the processing unit 21.

  The storage unit 22 is a storage device that stores various data input to the input unit 24, data received by the communication unit 23 from the data collection server 10, and the like. In addition, the storage unit 22 stores various programs necessary for general operation of the monitoring terminal 20 in advance. Furthermore, the memory | storage part 22 has memorize | stored previously the program required for monitoring the temperature difference of seawater.

  The processing unit 21 executes a program stored in the storage unit 22. The program executed by the processing unit 21 includes a monitoring processing program for monitoring the temperature difference of seawater. When the processing unit 21 executes the monitoring process program, the processing unit 21 performs the monitoring process shown in FIG. When starting the monitoring process, the processing unit 21 controls the display unit 25 to display an input screen for the monitoring process (step S1) and waits for an input of a reference time (step S2). When the processing unit 21 determines in step S2 that the reference time has been input to the output unit 26 (step S3), data representing a temperature difference within 60 minutes before and after the reference time is the center (hereinafter referred to as “two-hour temperature difference”). Data ”) is read from the temperature accumulation data stored in the data collection server 10 by controlling the communication unit 23 (step S4).

  An example of the 2-hour temperature difference data is shown in FIG. In FIG. 5, the temperature difference for 2 hours of the No. 1 unit is recorded with “18:20” as the reference time. When step S4 ends, the processing unit 21 stores the read two-hour temperature difference data and data obtained by graphing the two-hour temperature difference data (hereinafter referred to as “graphed data”) in the storage unit 22 ( Step S5). An example of the graphed data is shown in FIG. In this graphed data, “a pollution prevention agreement value” is recorded as a specified value of the temperature difference between seawater during intake and discharge. Note that the data for the No. 2 unit is also recorded in the graphed data of FIG. When step S5 ends, the processing unit 21 selects the first process from the first to fifth processes described later (step S6) and executes the selected process (step S7). When the first process ends and step S7 ends, the processing unit 21 determines whether or not the last process among the first process to the fifth process has ended (step S8).

  If the last process is not complete | finished by step S8, the process part 21 will select the next process (step S9) and will perform the process of step S7. Thus, the processing unit 21 performs the first process to the fifth process. The first to fifth processes performed by the processing unit 21 are as follows.

  The first process performed by the processing unit 21 is for calculating an average value of temperature differences in 60 minutes before the reference time. This first process is shown in FIG. When the first process is started, the processing unit 21 reads the 2-hour temperature difference data stored in the storage unit 22 (step S21). When step S21 ends, the processing unit 21 extracts the temperature difference in the time zone from the reference time to the time 60 minutes before from the 2-hour temperature difference data (step S22). In the case of the two-hour temperature difference data shown in FIG. 5, as shown in FIG. 8, the time zone up to the time 60 minutes before the reference time is T1. When step S22 is completed, the processing unit 21 calculates an average value by averaging the temperature differences in the time zone T1 (step S23). Thereafter, the processing unit 21 stores the calculated average value in the storage unit 22 (step S24), and ends the first process.

  The second process performed by the processing unit 21 calculates an average value of temperature differences at an arbitrary 60 minutes in the 2-hour temperature difference data, and calculates a maximum value (hereinafter referred to as “1 hour”) from each average value. Select "Maximum Value". This second process is shown in FIG. When the second process is started, the processing unit 21 reads the 2-hour temperature difference data stored in the storage unit 22 (step S41). When step S41 ends, the processing unit 21 determines the first 60 minutes from the two hours that are the time range of the two-hour temperature difference data (step S42), and sets the temperature difference included in the 60 minutes to 2 Extracted from the time-temperature difference data (step S43). The processing unit 21 averages the temperature differences extracted in step S43 to calculate an average value (step S44), and stores the calculated average value in the storage unit 22 (step S45).

When step S45 ends, the processing unit 21 determines whether any 60 minutes is the last 60 minutes (step S46). If the arbitrary 60 minutes is not the last 60 minutes, the processing unit 21 determines the next 60 minutes (step S47), and returns the process to step S43. For two hours the temperature difference data shown in FIG. 5, as shown in FIG. 10, the time period T2 ₁ of the first arbitrary 60 minutes is "17:20" - "18:20", the processing unit 21 , shifting the time zone T2 ₂ of any of the following 60 minutes to "17:21" - "18:21". By shifting 60 minutes in this way, the last arbitrary 60-minute time zone becomes “18:20” to “19:20”.

  On the other hand, if it is determined in step S46 that the arbitrary 60 minutes is the last 60 minutes, the processing unit 21 selects the maximum average value among the arbitrary 60 minute average values stored in step S45. (Step S48). Thereafter, the processing unit 21 stores the maximum average value in the storage unit 22 together with the time zone in which the average value is calculated (step S49), and ends the second process.

  The third process performed by the processing unit 21 calculates an average value of temperature differences in an arbitrary length range, that is, an arbitrary time zone from a specified time to a maximum of 60 minutes before the specified time. The medium maximum value (hereinafter referred to as “maximum value within one hour range”) is selected. This third process is shown in FIG. When the third process is started, the processing unit 21 reads the 2-hour temperature difference data stored in the storage unit 22 (step S61). When step S61 ends, the processing unit 21 sets a time designated as a calculation reference (hereinafter referred to as “designated time”) (step S62). The processing unit 21 sets the last time in the time zone of the two-hour temperature difference data, that is, the current time (hereinafter referred to as “current time”) as the designated time as the designated time. Further, the designated time may be an arbitrary time input to the input unit 24 or a reference time input to the input screen. In the case of the 2-hour temperature difference data shown in FIG. 5, as shown in FIG. 12, the processing unit 21 sets the designated time “19:20” with respect to the reference time “18:20”.

  When step S62 ends, the processing unit 21 determines the first time zone as an arbitrary time zone from the specified time (step S63), and sets the temperature difference included in the first time zone to the 2-hour temperature difference. Extract from the data (step S64). The processing unit 21 calculates the average value of the temperature differences extracted in step S64 (step S65), and stores the calculated average value in the storage unit 22 (step S66).

When step S66 ends, the processing unit 21 determines whether or not the length of an arbitrary time zone is 60 minutes (step S67). If the length of the time zone is not 60 minutes, the processing unit 21 determines the next time zone by adding the predetermined time to the length of the first time zone (step S68), and the process proceeds to step S64. return. For two hours the temperature difference data shown in FIG. 5, as shown in FIG. 13, the length of the first time zone T3 ₁ is retroactive by 10 minutes from the designated time "19:20", "19:10 Is a range up to. Then, the processing unit 21 to 10 minutes is the length of the first time zone T3 _1, by adding 5 minutes is a predetermined time, determine the next time period T3 _2. The length of this time period T3 ₂ is in the range of "19:05" - "19:20". In this way, the processing unit 21 sets the length of an arbitrary time zone, which is a range for extracting a temperature difference, as a range from the specified time to the first time that goes back 10 minutes, and then goes back the time by 5 minutes, The range goes back up to 60 minutes.

On the other hand, if it is determined in step S67 that the length of the time zone is within the range up to 60 minutes, the processing unit 21 determines the maximum average among the average values stored in step S66 for each time zone. A value is selected (step S69). Thereafter, the processing unit 21 stores the maximum average value in the storage unit 22 together with the time zone in which the average value is calculated (step S70), and ends the third process. It should be noted that, in the case of FIG. 13, the end of any of the time period, is "19:20" - "18:20" of _{T3 11.}

  The fourth process performed by the processing unit 21 is based on the maximum average value stored in the third process, and a countermeasure for preventing the average value of 60 minutes of the temperature difference from exceeding 7 ° C. Decide. This fourth process is shown in FIG. When starting the fourth process, the processing unit 21 reads the maximum average value stored in the storage unit 22 in step S70 of the third process (step S81). Thereafter, the processing unit 21 determines whether or not the read average value exceeds the specified value (step S82).

  If the maximum average value exceeds the specified value, the processing unit 21 calculates the elapsed time from the time zone when the average value is calculated (step S83). In step S83, the processing unit 21 calculates the difference between the first time and the last time in the time zone when the maximum average value is calculated, and uses the time of this difference as the elapsed time. When step S83 ends, the processing unit 21 calculates a non-elapsed time from the elapsed time (step S84). In step S84, the processing unit 21 calculates the difference between the monitoring time and the elapsed time to calculate the non-elapsed time.

When step S84 ends, the processing unit 21 determines that the average value exceeding the specified value falls within the specified value at the non-elapsed time (hereinafter referred to as “for corresponding operation”). (Referred to as “average value of”) (step S85). For example, as shown in FIG. 15, if the time zone in which the average value exceeding the specified value is calculated for the monitoring time of 60 minutes is “19:10” to “19:20”, the elapsed time is 10 minutes It becomes. Therefore, the non-elapsed time is 50 minutes. The processing unit 21 is, for example,
Specified value> (number of measurements in elapsed time x average value +
Using the relationship between the number of measurements within the non-elapsed time x the average value for the corresponding operation) / the number of measurements within the monitoring time, calculate the average value for the corresponding operation during the non-elapsed time so as not to exceed the specified value. . When step S85 ends, the processing unit 21 stores the average value for the corresponding operation and the non-elapsed time in the storage unit 22 (step S86). And the process part 21 complete | finishes a 4th process, when step S86 is complete | finished or when the average value of a temperature difference does not exceed a regulation value by step S82.

  The fifth process performed by the processing unit 21 adds the processing results of the first to fourth processes to the graphed data. This fifth process is shown in FIG. When starting the fifth process, the processing unit 21 reads the graphed data stored in the storage unit 22 in step S5 (step S101). Thereafter, the processing unit 21 reads the average value stored in the storage unit 22 in the first process from the reference time to the time 60 minutes before (step S102), and stores the average value in the storage unit 22 in the second process. Then, the maximum average value in any 60 minutes and its time zone are read (step S103). Thereafter, the processing unit 21 reads the maximum average value of the temperature difference in the arbitrary time zone and the time zone stored in the storage unit 22 in the third processing (step S104), and stores it in the fourth processing. The average value for the corresponding operation stored in the unit 22 and its time zone are read (step S105).

  When step S105 ends, the processing unit 21 adds the data obtained in steps S102 to S105 to the graphed data obtained in step S101 to generate system screen data (step S106). Thereafter, the processing unit 21 stores the generated system screen data in the storage unit 22 (step S107), and ends the fifth process.

  When the processing unit 21 performs the first to fifth processings and determines that the fifth processing is finished in step S8, the processing unit 21 reads out the system screen data that is the processing result of the fifth processing from the storage unit 22. (Step S10). Thereafter, the processing unit 21 controls the display unit 25 to display a system screen using the system screen data (step S11), and ends the monitoring process.

An example of the system screen displayed in step S11 is shown in FIG. The system screen P of FIG. 17 includes a screen portion P1 for displaying each calculation result and a screen portion P2 for displaying graphed data. In the screen part P1,
Average value from the reference time to the time 60 minutes before The maximum average value in any 60 minutes and its time zone The maximum average value of the temperature difference in any time zone and its time zone The elapsed time is displayed. In particular, when the average value for the corresponding operation is calculated, the processing unit 21 displays the corresponding operation for corresponding to the monitoring result in the display field P11 of the screen portion P1 as the temperature difference monitoring result.

In addition, the screen portion P2 includes
Graphed data 60-minute time zone before and after the reference time Time zone in which the maximum average value in any 60 minutes was calculated Time zone in which the maximum average temperature difference in any time zone was calculated Time period when the average value is applied (operation time period)
Is displayed. FIG. 17 illustrates the case where the designated time is the reference time.

  Upon receiving the corresponding operation data displayed in the display field P11 of the system screen P from the monitoring terminal 20 as the temperature difference monitoring result, the device control device 30 moves the moving blade for controlling the moving blade of the circulation pump 140. Open / close control is performed. For this purpose, the device control apparatus 30 performs the moving blade opening / closing process shown in FIG. When starting the moving blade opening / closing process, the device control device 30 determines whether a corresponding operation is necessary from the monitoring result (step S201). In FIG. 18, data representing a message “Please continue below X ° C. for Y minutes” corresponds to the data of the corresponding operation, that is, the monitoring result of the temperature difference.

When the corresponding operation in step S201 is judged to be unnecessary, the device control unit 30, the moving blade of the circulation pump 140 and closes automatically (step S202), continuing this state _{t 11} min only (e.g. 10 minutes) (step S203). The opening and closing of the moving blade is performed by the device control device 30 sending a control signal to the circulation pump 140. Thereafter, the device control apparatus 30 determines whether or not an end instruction has been received (step S204). If there is no instruction to end, the device control device 30 returns the process to step S201, and continues the automatic opening and closing of the moving blade for a necessary time. In addition, when there is an end instruction in FIG. 204, the processing is ended.

On the other hand, when it is determined in step S201 that a corresponding operation is necessary, the device control apparatus 30 fully opens the moving blade of the circulation pump 140 (step S205). Thereafter, the device controller 30, Y min is the time that is included in the data of the corresponding operation to determine whether t ₁₁ minutes or less (step S206). In step S206, the Y content is determined to be equal to or less than _{t 11} minutes, the device control unit 30 continues the state in which the fully open blades of the circulation pump 140 _{t 11} min only (step S207).

In step S206, the Y content is determined not to be less than _{t 11} min, the processing unit 21 performs the time determination process (step S208). In this time determination process, the temperature X ° C included in the data of the corresponding operation is
X ≧ tmp ₂₁
If there a relationship, the processing unit 21 continues the state of the rotor blade fully open the circulation pump 140 _{t 11} min only (step S209). X ° C
tmp ₂₂ ≦ X ≦ tmp ₂₃
If there a relationship, the processing unit 21 continues the state of the rotor blade fully open the circulating pump 140 _{t 12} min only (e.g. 20 minutes) (step S210), X ° C. in temperature,
tmp ₂₄ ≦ X ≦ tmp ₂₅
If there a relationship, continue the state of rotor blades fully open the circulating pump 140 _{t 13} min only (e.g. 30 minutes) (step S211). Furthermore, the temperature X ° C
X ≦ tmp ₂₆
In the relationship, the processing unit 21 keeps the moving blades fully opened for the circulation pump 140 by Y (step S212). tmp _{21 to} tmp ₂₆ are
tmp ₂₁ > tmp ₂₂ >...> to tmp ₂₆
For example,
tmp ₂₁ = 6.6 ° C
tmp ₂₂ = 6.5 ° C
tmp ₂₃ = 6.4 ° C
tmp ₂₄ = 6.3 ° C
tmp ₂₅ = 6.2 ° C
tmp ₂₆ = 6.1 ° C
It is a value like When the processing of any of steps S209 to S212 ends, the processing unit 21 performs the processing of step S204.

  In this way, the device control device 30 performs control to fully open the moving blades of the circulation pump 140 for a required time according to the corresponding operation by the moving blade opening / closing process.

  Next, a monitoring method using the monitoring system 1 according to this embodiment will be described. When checking the temperature difference of the cooling water, the person in charge operates the input unit 24 of the monitoring terminal 20 to start the monitoring processing program. Thereby, the monitoring terminal 20 performs a monitoring process. When starting the monitoring process, the monitoring terminal 20 displays an input screen on the display unit 25. As a result, the person in charge operates the input unit 24 to input a reference time serving as a reference for monitoring.

  When receiving the reference time, the monitoring terminal 20 performs the first to fifth processes of the monitoring process. Then, the monitoring terminal 20 displays the system screen P on the display unit 25 based on the system screen data created by the monitoring process. As a result, if the average value of the temperature differences exceeds the specified value, the person in charge operates the device control device 30 to change the corresponding operation data displayed in the display field P11 of the system screen P to the temperature difference. The monitoring result is input from the monitoring terminal 20 to the monitoring terminal 20.

  Upon receiving the corresponding operation data, the device control device 30 performs the moving blade opening / closing process and controls the opening / closing of the moving blade of the circulation pump 140. Thereby, when the average value of the temperature difference exceeds the specified value, the device control device 30 fully opens the moving blades of the circulation pump 140 for a necessary time, so that the average value of the temperature difference can be lowered.

Thus, according to this embodiment, the temperature difference of the seawater at the water intake 110 and the water outlet 120 changes, and the temperature difference changes around the input reference time.
Average value from the reference time to the time 60 minutes ago The maximum average value in any 60 minutes and its time zone can be automatically output. In particular, whether the average temperature difference may exceed the specified value before the specified time,
It can be output as the maximum average value of the temperature difference in any time zone and its time zone, and if it exceeds the specified value,
The corresponding operation can be output as the average value for the corresponding operation and the non-elapsed time. In this case, since the monitoring terminal 20 outputs a response operation, analysis by the person in charge is unnecessary, and a quick response is possible.

  Further, according to this embodiment, when the device control apparatus 30 receives the monitoring result of the temperature difference from the monitoring terminal 20, if the average value of the temperature difference exceeds a specified value, the device controller 30 opens and closes the moving blades of the circulation pump 140. Can be controlled automatically to prevent the average value from exceeding a specified value.

  In this embodiment, the monitoring process is performed for the No. 1 unit, but the monitoring process can be similarly performed for the No. 2 unit. Furthermore, the monitoring process can be performed even for the temperature difference between the No. 1 unit and the No. 2 unit.

(Embodiment 2)
In Embodiment 1, it was the monitoring system 1 which makes the monitoring object the temperature of the seawater which is the cooling water of a thermal power plant. However, in addition to the temperature of seawater, monitoring targets of the monitoring system 1 include dust in clean rooms and food production sites, solar radiation amount and humidity in greenhouses, radiation in medical sites, and the like. Can be used as is.

It is a block diagram which shows the monitoring system by Embodiment 1 of this invention. It is a figure which shows the intake / discharge system of a thermal power plant. It is a figure which shows an example of temperature accumulation data. It is a flowchart which shows an example of the monitoring process. It is a figure which shows an example of 2 hour temperature difference data. It is a figure which shows an example of graph-ized data. It is a flowchart which shows a 1st process. It is a figure explaining the mode of extraction of a temperature difference. It is a flowchart which shows a 2nd process. It is a figure explaining arbitrary 60 minutes. It is a flowchart which shows a 3rd process. It is a figure explaining designated time. It is a figure which shows the mode of the calculation of the temperature difference in arbitrary time slots. It is a flowchart which shows a 4th process. It is a figure which shows the mode of the calculation of the temperature difference corresponding to exceeding a regulation value. It is a flowchart which shows a 5th process. It is a figure which shows an example of a system screen. It is a flowchart which shows a moving blade opening / closing process.

Explanation of symbols

1 Monitoring system 10 Data collection server (storage device)
20 Monitoring terminal (processing device)
21 Processing Unit 22 Storage Unit 23 Communication Unit 24 Input Unit 25 Display Unit 26 Output Unit 30 Device Control Device

Claims (1)

A monitoring system for monitoring the discharge temperature so that an average value of a temperature difference between a water intake temperature and a discharge temperature of a power plant does not exceed a specified value in a preset monitoring time,
A storage device that records the temperature difference at regular time intervals;
It is a time zone retroactive to the current time , and in a plurality of arbitrary time zones retroactive to the monitoring time , the average value of the temperature difference is calculated with reference to the storage device, and the calculated average values select the maximum average value out of,
The current time is set so that the average value of the temperature difference from the start time of the arbitrary time zone in which the maximum average value is selected to the non-elapsed time that is the time when the monitoring time elapses does not exceed the specified value. A processing device for calculating an average value of temperature differences from the time until the non-elapsed time based on the maximum average value ;
A monitoring system comprising:

Images