JP6961475B2 - State evaluation device, state evaluation system, state evaluation method, and program - Google Patents

Description

The present invention relates to a state evaluation device, a state evaluation system, a state evaluation method, and a program for evaluating a cooling tower.

The power plant may be provided with a wet cooling tower to cool the cooling water. Patent Document 1 discloses a technique of measuring a state quantity related to a cooling tower and controlling a fan rotation speed of the cooling tower.

Special Table 2015-502513

The performance of the cooling tower is designed at the time of manufacture, and the control of the cooling tower is based on such rated performance. On the other hand, the inventor has found that the performance of the wet cooling tower deteriorates over time. Until then, it has not been known that the wet cooling tower deteriorates over time, and the wet cooling tower may not be provided with an instrument for measuring the state.
An object of the present invention is to provide a state evaluation device, a state evaluation system, a state evaluation method, and a program capable of appropriately evaluating a deteriorated state of performance of a wet cooling tower.

According to the first aspect of the present invention, the state evaluation device has a rated performance function indicating the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water. , A normal temperature difference, which is a temperature difference at a predetermined wet-bulb temperature, is calculated based on the temperature of water charged into the wet cooling tower, the temperature of water discharged from the wet cooling tower, and the wet-bulb temperature of the atmosphere. The normalization unit is provided, and an evaluation unit for evaluating the deteriorated state of the performance of the wet cooling tower based on the normal temperature difference is provided.

According to the second aspect of the present invention, in the state evaluation device according to the first aspect, the evaluation unit uses the temperature of the water charged into the wet cooling tower and the temperature of the water discharged from the wet cooling tower. And the wet-bulb temperature of the atmosphere, it may be determined whether the deterioration of the performance of the wet cooling tower is due to deterioration or failure.

According to the third aspect of the present invention, the state evaluation device according to the first or second aspect determines whether or not the parts of the wet cooling tower need to be cleaned and replaces the parts based on the deteriorated state of the performance. It may be further provided with an output unit that outputs at least one of the necessity and necessity of inspection of the wet cooling tower.

According to the fourth aspect of the present invention, the state evaluation device according to the third aspect determines whether the wet cooling tower should be cleaned or the parts should be replaced based on the deteriorated state of the performance. The output unit may further include a determination unit, and the output unit may output the recovery method determined by the recovery method determination unit.

According to the fifth aspect of the present invention, when the state evaluation device according to the fourth aspect determines that the parts should be replaced, based on the water quality of the water charged into the wet cooling tower, The output unit may further include a type determination unit that determines the type of the component to be replaced, and the output unit may output the type of the component.

According to the sixth aspect of the present invention, the state evaluation system includes an inlet thermometer that measures the temperature of water charged into the wet cooling tower and an outlet temperature that measures the temperature of water discharged from the wet cooling tower. A meter, a wet-bulb thermometer for measuring the wet-bulb temperature of the atmosphere, and a state evaluation device according to any one of the first to fifth aspects are provided.

According to the seventh aspect of the present invention, the state evaluation method includes a rated performance function indicating the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water. , A normal temperature difference, which is a temperature difference at a predetermined wet-bulb temperature, is calculated based on the temperature of water charged into the wet cooling tower, the temperature of water discharged from the wet cooling tower, and the wet-bulb temperature of the atmosphere. It has a step of, a step of evaluating the deterioration state of the performance of the wet cooling tower based on the normal temperature difference.

According to an eighth aspect of the present invention, the program tells the computer a rated performance function that indicates to the computer the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water. And, based on the temperature of the water charged into the wet cooling tower, the temperature of the water discharged from the wet cooling tower, and the wet-bulb temperature of the atmosphere , a normal temperature difference which is a temperature difference at a predetermined wet-bulb temperature is obtained. calculating, and a step of evaluating the deterioration state of the performance of the wet cooling tower based on the normal temperature difference.

According to at least one of the above aspects, the state evaluation device can appropriately evaluate the deterioration of the performance of the wet cooling tower.

It is a schematic block diagram which shows the structure of the power plant which concerns on one Embodiment. It is a schematic block diagram which shows the structure of the state evaluation apparatus which concerns on one Embodiment. It is a figure which shows the example of the rated performance function. It is a flowchart which shows the operation of the state evaluation apparatus which concerns on one Embodiment. It is a schematic block diagram which concerns on the structure of the state evaluation apparatus which concerns on one Embodiment. It is a flowchart which shows the operation of the state evaluation apparatus which concerns on one Embodiment. It is a schematic block diagram which shows the structure of the computer which concerns on at least one Embodiment.

<First Embodiment>
Hereinafter, embodiments will be described in detail with reference to the drawings.

<< Configuration of water treatment system >>
FIG. 1 is a schematic block diagram showing a configuration of a power plant according to an embodiment.
The power plant 10 includes a boiler 11, a steam turbine 12, a generator 13, a condenser 14, a pure water device 15, a wet cooling tower 16, a steam circulation line 101, a first replenishment line 102, a first drainage line 103, and a first. A chemical injection line 104, a cooling water circulation line 105, a second supply line 106, a second drainage line 107, a second chemical injection line 108, a wastewater treatment device 109, and a state evaluation device 110 are provided.

The boiler 11 evaporates water to generate steam.
The steam turbine 12 is rotated by the steam generated by the boiler 11.
The generator 13 converts the rotational energy of the steam turbine 12 into electric power.
The condenser 14 exchanges heat between the steam discharged from the steam turbine 12 and the cooling water, and returns the steam to water.
The pure water device 15 produces pure water.

The wet cooling tower 16 cools the cooling water heat-exchanged by the condenser 14. The wet cooling tower 16 is provided with a fan 161 for promoting evaporation of cooling water and a wet bulb thermometer 162 for measuring the wet bulb temperature in the vicinity of the wet cooling tower 16. The fan 161 is configured so that the air volume can be adjusted by controlling the number of fans or controlling the inverter.

The steam circulation line 101 is a line for circulating water and steam to the steam turbine 12, the condenser 14, and the boiler 11. A first water supply pump 1011 is provided between the condenser 14 and the boiler 11 in the steam circulation line 101. The first water supply pump 1011 pumps water from the condenser 14 to the boiler 11.

The first replenishment line 102 is a line for supplying the pure water generated by the pure water device 15 to the steam circulation line 101. A second water supply pump 1021 is provided on the first supply line 102. The second water supply pump 1021 is used when the condenser 14 is filled with water. During operation, the water in the first replenishment line 102 is pumped from the pure water device 15 toward the condenser 14 by the depressurization of the condenser 14.

The first drainage line 103 is a line for discharging a part of the water circulating in the steam circulation line 101 from the boiler 11 to the wastewater treatment device 109.
The first chemical injection line 104 is a line for supplying chemicals such as an anticorrosive agent, an antiscale agent, and a slime control agent to the vapor circulation line 101. The first drug injection line 104 includes a first drug tank 1041 for storing the drug and a first drug injection pump 1042 for supplying the drug from the first drug tank 1041 to the vapor circulation line 101.

The cooling water circulation line 105 is a line for circulating cooling water to the condenser 14 and the wet cooling tower 16. The cooling water circulation line 105 is provided with a third water supply pump 1051, a cooling water quality sensor 1052, a circulating water amount sensor 1053, a cooling tower inlet water temperature sensor 1054, and a cooling tower outlet water temperature sensor 1055. The third water supply pump 1051 pumps cooling water from the wet cooling tower 16 toward the condenser 14.
The cooling water quality sensor 1052 detects the water quality of the cooling water circulating in the cooling water circulation line 105. Examples of water quality detected by the sensor include electrical conductivity, pH value, salt concentration, metal concentration, COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), microbial concentration, and silica concentration, and combinations thereof. Can be mentioned. The cooling water quality sensor 1052 outputs a circulating water quality index value indicating the detected water quality to the state evaluation device 110. The circulating water amount sensor 1053 detects the flow rate of the cooling water circulating in the cooling water circulation line 105. The circulating water amount sensor 1053 outputs the circulating water amount indicating the detected water amount to the state evaluation device 110. The cooling tower inlet water temperature sensor 1054 detects the temperature of the cooling water charged into the wet cooling tower 16. The cooling tower inlet water temperature sensor 1054 outputs the cooling tower inlet water temperature indicating the detected temperature to the state evaluation device 110. The cooling tower outlet water temperature sensor 1055 detects the temperature of the cooling water discharged from the wet cooling tower 16. The cooling tower outlet water temperature sensor 1055 outputs the cooling tower outlet water temperature indicating the detected temperature to the state evaluation device 110.

The second replenishment line 106 is a line for supplying the raw water taken from the water source to the cooling water circulation line 105 as replenishment water. The second replenishment line 106 is provided with a fourth water supply pump 1061 and a replenishment water quality sensor 1062. The fourth water supply pump 1061 pumps make-up water from the water source toward the wet cooling tower 16. The make-up water quality sensor 1062 outputs a make-up water quality index value indicating the detected water quality to the state evaluation device 110.
The second drainage line 107 is a line for discharging a part of the water circulating in the cooling water circulation line 105 to the wastewater treatment device 109. The second drainage line 107 is provided with a blow valve 1071 and a drainage quality sensor 1072. The blow valve 1071 limits the amount of wastewater blown from the cooling water circulation line 105 to the wastewater treatment device 109.

The second drug injection line 108 is a line for supplying a drug to the cooling water circulation line 105. The second drug injection line 108 includes a second drug tank 1081 for storing the drug and a second drug injection pump 1082 for supplying the drug from the second drug tank 1081 to the cooling water circulation line 105.

The wastewater treatment device 109 injects an acid, an alkali, a coagulant, or other chemicals into the wastewater discharged from the first wastewater line 103 and the second wastewater line 107. The wastewater treatment device 109 discards the wastewater treated by the chemicals.

The state evaluation device 110 is wet based on the wet-bulb temperature detected by the wet-bulb thermometer 162, the cooling tower inlet water temperature detected by the cooling tower inlet water temperature sensor 1054, and the cooling tower outlet water temperature detected by the cooling tower outlet water temperature sensor 1055. The state of deterioration in the performance of the cooling tower 16 is evaluated.

<< Configuration of condition evaluation device >>
FIG. 2 is a schematic block diagram showing a configuration of a state evaluation device according to an embodiment.
The state evaluation device 110 includes an information acquisition unit 1101, a temperature difference calculation unit 1102, a normalization unit 1103, a history storage unit 1104, a change rate calculation unit 1105, an evaluation unit 1106, and an output unit 1107.

The information acquisition unit 1101 acquires the wet-bulb temperature of the atmosphere detected by the wet-bulb thermometer 162, the cooling tower inlet water temperature detected by the cooling tower inlet water temperature sensor 1054, and the cooling tower outlet water temperature detected by the cooling tower outlet water temperature sensor 1055. ..
The temperature difference calculation unit 1102 calculates the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature.

The normalization unit 1103 calculates a normal temperature difference in which the temperature difference is normalized based on the wet-bulb temperature of the atmosphere. That is, the normalization unit 1103 at a predetermined wet-bulb temperature (for example, rated wet-bulb temperature) based on a known rated performance function, a wet-bulb temperature, and a temperature difference between a cooling tower inlet temperature and a cooling tower outlet temperature. Calculate the normal temperature difference, which is the temperature difference. The rated performance function is a function designed at the time of manufacturing the wet cooling tower 16 as the rated performance of the wet cooling tower 16, and represents the relationship between the wet-bulb temperature, the cooling tower inlet temperature, and the cooling tower outlet temperature. .. FIG. 3 is a diagram showing an example of a rated performance function. In the rated performance function, the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature increases monotonically with respect to the wet-bulb temperature. For example, the normalization unit 1103 obtains the ratio between the temperature difference obtained by substituting the measured wet-bulb temperature into the rated performance function and the temperature difference related to the rated wet-bulb temperature, and obtains the measured cooling tower inlet temperature. The normal temperature difference can be calculated by multiplying the temperature difference of the cooling tower outlet temperature by the ratio.

The history storage unit 1104 stores the normal temperature difference in association with the time.
The change rate calculation unit 1105 calculates the change rate of the normal temperature difference based on the normal temperature difference calculated by the normalization unit 1103 and the history of the normal temperature difference stored in the history storage unit 1104. The rate of change calculation unit 1105 can calculate the rate of change by, for example, differentiating the time series of the normal temperature difference.

The evaluation unit 1106 evaluates the deteriorated state of the performance of the wet cooling tower 16 based on the normal temperature difference and the rate of change of the normal temperature difference. Specifically, the evaluation unit 1106 determines that the deterioration in performance is due to an obstacle when the rate of change of the normal temperature difference is equal to or greater than a predetermined rate of change threshold. Further, the evaluation unit 1106 determines that the deterioration in performance is due to deterioration when the rate of change of the normal temperature difference is less than a predetermined threshold value. Here, as an example of deterioration of the wet cooling tower 16, the heat exchange rate may decrease due to scaling or fouling inside the wet cooling tower 16. Further, as an example of the failure of the wet cooling tower 16, foreign matter may be mixed in or the wet cooling tower 16 may be damaged. Further, the evaluation unit 1106 determines whether or not the deterioration in performance is acceptable by determining whether or not the normal temperature difference is less than a predetermined temperature difference threshold value.

The temperature difference threshold is equal to, for example, the sum of the power sales revenue obtained in the time required for cleaning the wet cooling tower 16 and the cost related to cleaning, and the power loss amount due to the performance deterioration corresponding to the value of the temperature difference threshold. It is set to such a value. By setting such a value, when the normal temperature difference of the wet cooling tower 16 is equal to or larger than the temperature difference threshold value, the amount of electricity sales revenue obtained in the time required for cleaning the wet cooling tower 16 and the cost related to cleaning The sum is less than or equal to the amount of power loss due to performance degradation. On the other hand, when the normal temperature difference of the wet cooling tower 16 is less than the temperature difference threshold, the sum of the power sales revenue obtained in the time required for cleaning the wet cooling tower 16 and the cost related to cleaning is the power loss amount due to the performance deterioration. Become bigger.

The output unit 1107 outputs information based on the performance deterioration state evaluated by the evaluation unit 1106. For example, the output unit 1107 recommends that a failure occurs and an inspection is performed when the evaluation unit 1106 evaluates that the performance has deteriorated due to a failure and the normal temperature difference is less than a predetermined threshold value. Output to the effect. Further, for example, when the evaluation unit 1106 evaluates that the performance of the output unit 1107 is deteriorated due to deterioration and the normal temperature difference is less than a predetermined threshold value, the performance is deteriorated due to the deterioration. , And output that cleaning of the wet cooling tower 16 or replacement of parts is recommended. The output by the output unit 1107 may be, for example, transmitting information to a computer owned by the administrator via a network, or displaying the information on a display.

<< Operation of state evaluation device >>
FIG. 4 is a flowchart showing the operation of the state evaluation device according to the embodiment.
The state evaluation device 110 periodically executes the state evaluation process shown in FIG. First, the information acquisition unit 1101 acquires the wet-bulb temperature of the atmosphere detected by the wet-bulb thermometer 162, the cooling tower inlet water temperature detected by the cooling tower inlet water temperature sensor 1054, and the cooling tower outlet water temperature detected by the cooling tower outlet water temperature sensor 1055. (Step S1). The temperature difference calculation unit 1102 calculates the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature (step S2).

The normalization unit 1103 calculates the normal temperature difference based on the known rated performance function, the wet-bulb temperature, and the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature (step S3). The normalization unit 1103 records the calculated normal temperature difference in the history storage unit 1104 in association with the current time (step S4). The rate of change calculation unit 1105 calculates the rate of change of the normal temperature difference based on the time series of the normal temperature difference stored in the history storage unit 1104 (step S5).

The evaluation unit 1106 determines whether or not the normal temperature difference is less than a predetermined temperature difference threshold value (step S6). When the normal temperature difference is equal to or greater than the temperature difference threshold value (step S6: NO), the evaluation unit 1106 has not deteriorated the performance of the wet cooling tower 16, or the deteriorated state of the performance of the wet cooling tower 16 is acceptable. Evaluate that there is, and end the process.

On the other hand, when the normal temperature difference is less than the temperature difference threshold value (step S6: YES), the evaluation unit 1106 determines whether or not the absolute value of the rate of change of the normal temperature difference is less than the predetermined change amount threshold value (step S6: YES). Step S7).
When the absolute value of the rate of change of the normal temperature difference is less than a predetermined threshold value (step S7: YES), the evaluation unit 1106 evaluates that the deterioration in the performance of the wet cooling tower 16 is due to deterioration. In this case, the output unit 1107 outputs that the performance is deteriorated due to the deterioration of the wet cooling tower 16 and that cleaning of the wet cooling tower 16 or replacement of parts is recommended (step S8).
On the other hand, when the rate of change of the normal temperature difference is equal to or greater than a predetermined threshold value (step S7: NO), the evaluation unit 1106 evaluates that the deterioration in the performance of the wet cooling tower 16 is due to an obstacle. In this case, the output unit 1107 outputs that the wet cooling tower 16 has a failure and that the inspection of the wet cooling tower 16 is recommended (step S9).

《Action / Effect》
As described above, the state evaluation device 110 according to the first embodiment evaluates the deteriorated state of the performance of the wet cooling tower 16 based on the cooling tower inlet temperature, the cooling tower outlet temperature, and the wet-bulb temperature of the atmosphere. As a result, the state evaluation device 110 can quantify the current performance of the wet cooling tower 16, so that the deteriorated state of the performance of the wet cooling tower 16 can be appropriately evaluated. Further, the state evaluation device 110 periodically evaluates the deteriorated state of the performance, so that the manager of the power plant 10 can monitor the deteriorated state of the performance of the wet cooling tower 16 and measure the timing of appropriate measures. can.

Further, in the state evaluation device 110 according to the first embodiment, whether the deterioration of the performance of the wet cooling tower 16 is due to deterioration based on the cooling tower inlet temperature, the cooling tower outlet temperature, and the wet-bulb temperature of the atmosphere. Determine if it is due to a failure. As a result, the manager of the power plant 10 can take measures according to the reason for the deterioration of the performance of the wet cooling tower 16.
In particular, the state evaluation device 110 according to the first embodiment requires cleaning of the wet cooling tower 16, replacement of parts, and inspection based on the deteriorated state of the performance of the wet cooling tower 16. To judge. As a result, the manager of the power plant 10 can take appropriate measures according to the reason for the deterioration of the performance of the wet cooling tower 16.

<< Modification example >>
The evaluation unit 1106 of the state evaluation device 110 according to the first embodiment determines whether or not the absolute value of the rate of change of the normal temperature difference is less than a predetermined threshold value, so that the deterioration of the performance is due to an obstacle. It evaluates whether it is due to deterioration or deterioration, but it is not limited to this. For example, the evaluation unit 1106 according to another embodiment evaluates that the deterioration in performance is due to an obstacle when the double differential value of the normal temperature difference is a positive number, and the double differential value of the normal temperature difference. If is not a positive number, it may be evaluated that the deterioration in performance is due to deterioration. This is because when the deterioration of the performance of the wet cooling tower 16 is due to deterioration, the rate of change of the normal temperature difference decreases with the passage of time, whereas the deterioration of the performance of the wet cooling tower 16 is due to the failure. This is because the rate of change of the normal temperature difference temporarily increases due to a sudden change in the state of the wet cooling tower 16.

<Second embodiment>
When the performance deteriorates due to the deterioration of the wet cooling tower 16, the administrator can recover the performance of the wet cooling tower 16 by either cleaning the wet cooling tower 16 or replacing parts. ..
When replacing the parts of the wet cooling tower 16, it is necessary to stop the wet cooling tower 16 for a long time as compared with the cleaning of the wet cooling tower 16, and the cost of the parts to be replaced and the labor cost are higher. Occurs. On the other hand, when the parts of the wet cooling tower 16 are replaced, the performance of the wet cooling tower 16 can be further improved by upgrading the parts.
When cleaning the wet cooling tower 16, the performance of the wet cooling tower 16 can be restored in a short time and at a low cost as compared with the replacement of parts. On the other hand, depending on the state of the wet cooling tower 16, the performance may not be sufficiently recovered by cleaning the wet cooling tower 16.

The state evaluation device 110 according to the second embodiment presents whether the wet cooling tower 16 should be cleaned or parts should be replaced based on the state of the wet cooling tower 16.

<< Configuration of condition evaluation device >>
FIG. 5 is a schematic block diagram relating to the configuration of the state evaluation device according to the embodiment.
The state evaluation device 110 according to the second embodiment further includes a model storage unit 1111, a recovery method determination unit 1112, and a type determination unit 1113 in addition to the configuration of the first embodiment. Further, the information acquisition unit 1101 according to the second embodiment, in addition to the state quantity acquired in the first embodiment, further, the make-up water quality index value measured by the make-up water quality sensor 1062 and the cooling water quality measured by the cooling water quality sensor 1052. The index value and the circulating water amount measured by the circulating water amount sensor 1053 are acquired.

The model storage unit 1111 inputs the wet-bulb temperature, the cooling tower inlet water temperature, the cooling tower outlet water temperature, the make-up water quality index value, the cooling water quality index value, and the circulating water amount, and outputs a method for recovering the performance of the wet cooling tower 16. Memorize the model of. The model is a machine learning model such as a neural network. The method of recovering the performance according to the second embodiment is cleaning or replacement of parts.

In the model learning course, for example, the model can be trained by the following method. When the manager of the power plant 10 needs to clean the wet cooling tower 16 in the actual machine, the combination of the above state quantities at that time, the time required for cleaning the wet cooling tower 16, and the cleaning completion timing Measure the interval from to the timing when cleaning is required next time. The manager subtracts the amount of loss due to the shutdown of the power plant 10 and the cost related to cleaning from the amount of electricity sold of the power plant 10 during the interval after cleaning due to the time required for cleaning the wet cooling tower 16. By doing so, the actual amount of electricity sold after cleaning is calculated.
On the other hand, the manager calculates the cost required for replacing the parts of the wet cooling tower 16, the time required for replacing the parts, and the interval until the next cleaning is required after the replacement. The manager replaces the power plant 10 by subtracting the loss amount due to the shutdown of the power plant 10 and the cost related to the replacement from the power sales amount of the power plant 10 during the interval after the replacement. Calculate the actual power sales amount later.
When the actual power sales amount after cleaning exceeds the actual power sales amount after replacement, the administrator generates teacher data that associates the combination of the above state quantities with the information indicating that the performance recovery method is cleaning. Then, the model is trained based on the teacher data.
When the actual power sales amount after cleaning is less than the actual power sales amount after replacement, the administrator generates teacher data that associates the combination of the above state quantities with the information indicating that the performance recovery method is replacement. Then, the model is trained based on the teacher data.
The above teacher data does not necessarily have to be generated based on the processing in the actual machine. For example, the teacher data may be automatically generated by a computer performing the above calculation based on a simulation of deterioration of the wet cooling tower 16 in the power plant 10.

The recovery method determination unit 1112 determines a recovery method for the performance of the wet cooling tower 16 by inputting each state quantity acquired by the information acquisition unit 1101 into the model stored in the model storage unit 1111. That is, the recovery method determination unit 1112 determines whether the wet cooling tower 16 should be cleaned or the parts should be replaced based on the performance deterioration state.

When the recovery method determination unit 1112 determines that the parts should be replaced, the type determination unit 1113 determines the type of the parts to be replaced based on the make-up water quality index value acquired by the information acquisition unit 1101. Examples of parts to be replaced include nozzles and fillers. The higher the atomization performance of the nozzle, the better the cooling efficiency of the wet cooling tower 16 is expected, but the more likely it is to deteriorate due to clogging. Further, as the filler has a larger surface area like the film-type filler, the cooling efficiency of the wet cooling tower 16 is expected to be improved, but deterioration due to clogging is likely to occur. On the other hand, as the filler has a smaller surface area like the splash type filler, the improvement rate of the cooling efficiency of the wet cooling tower 16 is lower, but deterioration due to clogging is less likely to occur.
Therefore, when the make-up water quality index value is equal to or higher than a predetermined water quality threshold value (good), the type determination unit 1113 replaces the nozzle with high granulation performance and the filler having a large surface area with the type of parts. To decide. On the other hand, when the make-up water quality index value is less than a predetermined water quality threshold value (defective), the type determination unit 1113 replaces the nozzle with low granulation performance and the filler having a small surface area with the type of parts. To decide.

<< Operation of state evaluation device >>
FIG. 6 is a flowchart showing the operation of the state evaluation device according to the embodiment.
The state evaluation device 110 according to the second embodiment periodically executes the state evaluation process shown in FIG. First, the information acquisition unit 1101 acquires the wet-bulb temperature, the cooling tower inlet water temperature, the cooling tower outlet water temperature, the make-up water quality index value, the cooling water quality index value, and the circulating water amount (step S21). The temperature difference calculation unit 1102 calculates the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature (step S22).

The normalization unit 1103 calculates the normal temperature difference based on the known rated performance function, the wet-bulb temperature, and the temperature difference between the cooling tower inlet temperature and the cooling tower outlet temperature (step S23). The normalization unit 1103 records the calculated normal temperature difference in the history storage unit 1104 in association with the current time (step S24). The rate of change calculation unit 1105 calculates the rate of change of the normal temperature difference based on the time series of the normal temperature difference stored in the history storage unit 1104 (step S25).

The evaluation unit 1106 determines whether or not the normal temperature difference is less than a predetermined temperature difference threshold value (step S26). When the normal temperature difference is equal to or greater than the temperature difference threshold value (step S26: NO), the evaluation unit 1106 has not deteriorated the performance of the wet cooling tower 16, or the deteriorated state of the performance of the wet cooling tower 16 is acceptable. Evaluate that there is, and end the process.

On the other hand, when the normal temperature difference is less than the temperature difference threshold value (step S26: YES), the evaluation unit 1106 determines whether or not the absolute value of the rate of change of the normal temperature difference is less than the predetermined change amount threshold value (step S26: YES). Step S27).
When the rate of change of the normal temperature difference is equal to or greater than a predetermined threshold value (step S27: NO), the evaluation unit 1106 evaluates that the deterioration in the performance of the wet cooling tower 16 is due to a failure. In this case, the output unit 1107 outputs that the wet cooling tower 16 has a failure and that the inspection of the wet cooling tower 16 is recommended (step S28).

On the other hand, when the absolute value of the rate of change of the normal temperature difference is less than a predetermined threshold value (step S27: YES), the recovery method determination unit 1112 stores the state quantity acquired in step S21 in the model storage unit 1111. By inputting to, the performance recovery method is determined (step S29). The type determination unit 1113 determines whether or not the recovery method determined by the recovery method determination unit 1112 is replacement of parts (step S30). When the recovery method determined by the recovery method determination unit 1112 is cleaning (step S30: NO), the output unit 1107 has deteriorated in performance due to deterioration of the wet cooling tower 16 and cleans the wet cooling tower 16. Output the recommendation (step S31).

When the recovery method determined by the recovery method determination unit 1112 is replacement of parts (step S30: YES), the type determination unit 1113 determines the type of parts to be replaced based on the make-up water quality index value acquired in step S21. (Step S32). The output unit 1107 outputs that the performance is deteriorated due to the deterioration of the wet cooling tower 16 and that the type determination unit 1113 recommends replacement with the determined type of parts (step S33).

《Action / Effect》
In this way, the state evaluation device 110 according to the second embodiment determines whether to replace or clean the parts based on the state quantity of the wet cooling tower 16. As a result, the manager of the power plant 10 can take appropriate measures to restore the performance of the wet cooling tower 16. In particular, in the second embodiment, the recovery method can be determined based on the profit / loss related to the replacement of the parts and the profit / loss related to the cleaning of the parts, so that the recovery method presented is a recovery that minimizes the loss. It becomes a method.

Further, the state evaluation device 110 according to the second embodiment determines the type of parts to be replaced based on the make-up water quality index value. As a result, the state evaluation device 110 can propose an upgrade of parts according to the water quality of the make-up water at the time of replacement.

Although one embodiment has been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes and the like can be made.
For example, the state evaluation device 110 according to the above-described embodiment determines whether the performance deterioration is due to a failure or deterioration based on the normal temperature difference, but the present invention is not limited to this. For example, the state evaluation device 110 may determine whether the performance deterioration is due to a failure or deterioration by inputting the information acquired by the information acquisition unit 1101 into the trained model.

FIG. 7 is a schematic block diagram showing the configuration of a computer according to at least one embodiment.
The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, and an interface 904.
The above-mentioned state evaluation device 110 is mounted on the computer 900. The operation of each processing unit described above is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903, expands it to the main storage device 902, and executes the above processing according to the program. Further, the CPU 901 secures a storage area corresponding to the model storage unit 1111 described above in the main storage device 902 and the auxiliary storage device 903 according to the program.

Examples of the auxiliary storage device 903 include HDD (Hard Disk Drive), SSD (Solid State Drive), magnetic disk, optical magnetic disk, CD-ROM (Compact Disc Read Only Memory), and DVD-ROM (Digital Versatile Disc Read Only). Memory), semiconductor memory and the like. The auxiliary storage device 903 may be internal media directly connected to the bus of computer 900, or external media connected to computer 900 via interface 904 or a communication line. When this program is distributed to the computer 900 via a communication line, the distributed computer 900 may expand the program to the main storage device 902 and execute the above processing. In at least one embodiment, the auxiliary storage device 903 is a non-temporary tangible storage medium.

Further, the program may be for realizing a part of the above-mentioned functions. Further, the program may be a so-called difference file (difference program) that realizes the above-mentioned function in combination with another program already stored in the auxiliary storage device 903.

16 Wet cooling tower 110 State evaluation device 1101 Information acquisition unit 1102 Temperature difference calculation unit 1103 Normalization unit 1104 History storage unit 1105 Change rate calculation unit 1106 Evaluation unit 1107 Output unit 1111 Model storage unit 1112 Recovery method determination unit 1113 Type determination unit

Claims (8)

A rated performance function showing the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water, the temperature of the water charged into the wet cooling tower, and the wet cooling. A normalization unit that calculates the normal temperature difference, which is the temperature difference at a predetermined wet-bulb temperature , based on the temperature of the water discharged from the tower and the wet-bulb temperature of the atmosphere.
State evaluation device comprising an evaluation unit for evaluating the deterioration state of the performance of the wet cooling tower based on the normal temperature difference. In the evaluation unit, the deterioration of the performance of the wet cooling tower is deteriorated based on the temperature of the water charged into the wet cooling tower, the temperature of the water discharged from the wet cooling tower, and the wet-bulb temperature of the atmosphere. The state evaluation device according to claim 1, wherein it determines whether the temperature is due to a failure or a failure. An output unit that outputs at least one of the necessity of cleaning the parts of the wet cooling tower, the necessity of replacement of the parts, and the necessity of inspection of the wet cooling tower based on the deteriorated state of the performance is further provided. The state evaluation device according to claim 1 or 2. A recovery method determination unit for determining whether the wet cooling tower should be cleaned or the parts should be replaced based on the performance deterioration state is further provided.
The state evaluation device according to claim 3, wherein the output unit outputs a recovery method determined by the recovery method determination unit. An evaluation unit that evaluates the state of deterioration in the performance of the wet cooling tower based on the temperature of the water charged into the wet cooling tower, the temperature of the water discharged from the wet cooling tower, and the wet-bulb temperature of the atmosphere.
A recovery method determining unit that determines whether the wet cooling tower should be cleaned or the parts of the wet cooling tower should be replaced based on the performance deterioration state.
When it is determined that the parts should be replaced, a type determination unit that determines the type of the parts to be replaced based on the water quality of the water charged into the wet cooling tower .
With an output unit that outputs the determined type of the part
A condition evaluation device including. An inlet thermometer that measures the temperature of the water that is put into the wet cooling tower,
An outlet thermometer that measures the temperature of the water discharged from the wet cooling tower,
A wet-bulb thermometer that measures the temperature of the wet-bulb in the atmosphere,
A state evaluation system including the state evaluation device according to any one of claims 1 to 5. A rated performance function showing the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water, the temperature of the water charged into the wet cooling tower, and the wet cooling. A step of calculating a normal temperature difference, which is a temperature difference at a predetermined wet-bulb temperature , based on the temperature of water discharged from the tower and the wet-bulb temperature of the atmosphere.
State evaluation method comprising a step of evaluating the deterioration state of the performance of the wet cooling tower based on the normal temperature difference. On the computer
A rated performance function showing the relationship between the wet-bulb temperature of the wet cooling tower and the temperature difference between the water charged into the wet cooling tower and the discharged water, the temperature of the water charged into the wet cooling tower, and the wet cooling. A step of calculating a normal temperature difference, which is a temperature difference at a predetermined wet-bulb temperature , based on the temperature of water discharged from the tower and the wet-bulb temperature of the atmosphere.
Program for executing a step of evaluating the deterioration state of the performance of the wet cooling tower based on the normal temperature difference.

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