CN111263922A - Water temperature control method and system - Google Patents
Water temperature control method and system Download PDFInfo
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- CN111263922A CN111263922A CN201880068657.8A CN201880068657A CN111263922A CN 111263922 A CN111263922 A CN 111263922A CN 201880068657 A CN201880068657 A CN 201880068657A CN 111263922 A CN111263922 A CN 111263922A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
It is possible to provide a system capable of reducing the amount of heating and/or cooling heat at the delivery source and utilizing the amount of heating and/or cooling heat at the destination as simply as possible. A pure water temperature control system (1) is provided with: a pure water production apparatus (10); a pure water utilization device (20); an outdoor piping (30) for sending pure water from the pure water production facility (10) to the pure water utilization facility; and a delivery source temperature control device (40) which controls the delivery source of the pure water to a delivery source target temperature. A data processing server (413) constructs a model for predicting a UA value from past meteorological data around an outdoor pipe and past operation performance data such as water temperature and flow rate, and calculates the UA predicted value by inputting the latest meteorological data and operation data around the outdoor pipe to the model. A heating temperature determination device (42) acquires a delivery source target temperature of the pure water from the UA predicted value and the use destination target temperature of the pure water. The heating temperature determining device (42) may be a device that determines both the heating temperature and the cooling temperature.
Description
Technical Field
The invention relates to a water temperature control method and a water temperature control system. More specifically, the present invention relates to a control method and a control device for controlling a delivery source temperature (pipe inlet temperature) in which a use destination temperature (pipe outlet temperature) is controlled within a predetermined range in a plant in which a water treatment facility and a facility for treating water using the water treatment facility are different from each other.
Background
Conventionally, there has been provided a technique for controlling the temperature of pure water produced by a pure water production apparatus within a fixed range.
For example, patent document 1 discloses the following: in a pure water production method for producing pure water by passing raw water whose temperature has been controlled by a heat exchanger through a reverse osmosis membrane separation device, the raw water whose temperature has been adjusted by the heat exchanger is supplied to a receiving tank so as to be controlled so that the water level is constant, the temperature of the raw water in the receiving tank is detected, a part of the raw water in the receiving tank is circulated to the receiving tank through the heat exchanger based on the detected temperature so as to control the temperature of the raw water in the receiving tank to be constant, and the raw water is fed from the receiving tank to the reverse osmosis membrane separation device. According to the configuration described in patent document 1, the temperature of the treated water (pure water) produced by the reverse osmosis membrane separation device can be stabilized at a fixed temperature with high accuracy even if the amount of the treated water (pure water) to be produced varies greatly by controlling the water level and the temperature in the receiving tank to be constant by circulating the raw water in the receiving tank through the heat exchanger in accordance with the temperature of the raw water in the receiving tank provided at the preceding stage of the reverse osmosis membrane separation device.
If the distance between the production site of pure water and the use site of pure water is short, no particular problem will arise even if the method described in patent document 1 is employed. However, in a manufacturing plant of precision electronic equipment or the like, a pure water manufacturing facility for manufacturing pure water and a pure water utilizing facility for utilizing pure water are sometimes connected by an outdoor pipe having a length of about 0.5km to 3 km. In this case, heat dissipation or heat absorption may occur on the surface of the pipe through which the deionized water flows, and the temperature of the deionized water may change in the pipe.
As the temperature management of pure water, the temperature of pure water at the use site is important, not the temperature of pure water at the production site. Therefore, the following technique is sought: the temperature of pure water at the use destination can be kept constant even when the distance between the production site of pure water and the use site of pure water is long and the temperature of pure water may change during water supply when pure water is supplied from the production site to the use site.
Fig. 4 is a block diagram showing an example of a pure water temperature control system 100 in a factory in which a pure water production facility and a pure water utilization facility are located at separate locations.
Pure water is produced from industrial water or the like in a pure water production apparatus 111 in the pure water production facility 110, and the pure water is stored in a pure water tank 112 in the pure water production facility 110.
The pure water is supplied from the pure water production apparatus 110 to the pure water utilization apparatus 120. An outdoor pipe 130 for supplying deionized water is provided between the deionized water producing apparatus 110 and the deionized water utilizing apparatus 120. The length of the outdoor piping 130 is about 0.5km to 3 km.
The pure water stored in the pure water receiving tank 121 of the pure water utilizing device 120 is cooled to a predetermined temperature by a cooler (heat exchanger with cold water) 122. In particular, when the use destination is a manufacturing factory of precision electronic equipment, it is necessary to strictly control the temperature of pure water at the use destination within a range of ± 0.5 ℃. In addition, the flow rate of the cold water passing through the cooler 122 is often adjusted in order to cool the water to a predetermined temperature.
For example, when the temperature of the industrial water supplied to the pure water production facility 110 is higher than a predetermined temperature when pure water is used in the pure water use facility 120 as in summer, it is not necessary to steam-heat the pure water produced by the pure water production apparatus 111 in the pure water tank 112 provided in the pure water production facility 110. However, when the temperature of the industrial water supplied to the pure water production facility 110 is lower than a predetermined temperature at the time of using pure water in the pure water usage facility 120 as in winter, it is necessary to steam-heat the pure water produced by the pure water production apparatus 111 using the steam heater 113.
For example, in winter, when the allowable temperature range of the pure water use destination is 24 ℃ ± 0.5 ℃, the pipe inlet temperature at the thermometer 114 is set to 25.0 ℃ in consideration of heat dissipation from the surface of the water supply pipe. At this time, the temperature of the deionized water receiving tank 121 is about 24.4 to 24.9 ℃ due to heat dissipation from the surface of the outdoor pipe 130, and the deionized water is cooled by the cooler 122 to control the water temperature to 24.0 ℃ and then supplied to the deionized water use destination.
This conventional method has a problem from the viewpoint of energy saving. In the first place, steam heating using the steam heater 113 may be performed in consideration of only the amount of heat emitted from the surface of the outdoor pipe 130, and steam heating exceeding the amount of heat emitted from the surface of the outdoor pipe 130 may be energy waste. In addition, cooling by the cooler 122 provided in the pure water utilizing device 120 may be regarded as energy waste.
In this case, if the heating temperature set value of the steam heater 113 is simply decreased from 25.0 ℃ to, for example, 24.5 ℃, the allowable temperature range at the pure water use destination may not be satisfied. Although the outdoor pipe 130 is wound with the heat insulating material, even in this case, the temperature of the pure water may be lowered by about 1 ℃ due to heat dissipation particularly in the case of strong wind, and it can be said that it is not easy to lower the heating temperature set value in the steam heater 113.
As a technique for keeping the temperature of pure water at a utilization destination constant, patent document 2 discloses the following: periodically collecting the energy consumption P of the heat source device 1W1Energy consumption P of cold and hot water pump 2W2And the water supply temperature T of the cold and hot water from the heat source equipment 1SAnd the outside air temperature toutThe actual performance values of the collected parameters are plotted in a multidimensional space, a response surface model is created by using the RSM-S technique, and the energy consumption is determined by using the created response surface modelMinimum optimum water supply temperature TSsp。
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-212834
Patent document 2: japanese laid-open patent publication No. 2010-236786
Disclosure of Invention
Problems to be solved by the invention
However, in the technique described in patent document 2, it is desired to control the optimum water supply temperature TS more easily by using a response curve modelsp。
The present invention has been made in view of such a problem, and an object of the present invention is to provide a system capable of reducing the amount of heating heat and/or cooling heat at a delivery source and utilizing the amount of heating heat and/or cooling heat at a destination as simply as possible, and achieving energy saving and cost saving.
Means for solving the problems
The present inventors have made extensive studies to solve the above-described problems, and as a result, have found that the above-described problems can be solved by constructing a model for predicting a UA value indicating the product of the total heat transfer coefficient and the heat transfer area of outdoor piping from past meteorological data around the outdoor piping and past operation performance data such as water temperature and flow rate, and by inputting the latest meteorological data and operation data to the model to set a delivery source target temperature, and have completed the present invention. Specifically, the present invention provides the following.
(1) The invention relates to a water temperature control method, which comprises the following steps: in the process of supplying the treated water with the temperature adjusted by the water treatment equipment to the use destination of the treated water through the outdoor piping, a model for predicting a UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping from the past meteorological data around the outdoor piping and the past operation performance data such as the water temperature and the flow rate is constructed, the UA predicted value is calculated by inputting the latest meteorological data and operation data to the model, the delivery source target temperature of the treated water is calculated from the UA predicted value and the use destination target temperature of the treated water, and the supply heat quantity of the heating unit and/or the cooling unit of the treated water is adjusted according to the delivery source target temperature.
(2) In the present invention, according to the water temperature control method described in (1), the delivery source target temperature is calculated by the following equation.
The delivery source target temperature is equal to the outside air temperature + (use destination target temperature-outside air temperature) × EXP { UA determination value/(delivery water flow rate in outdoor piping × specific heat of water) }
(3) In the present invention, according to the water temperature control method described in (1) or (2), the UA decision value is calculated by inputting the latest meteorological data and operation data to the model and adding a predetermined margin value to the UA predicted value obtained by the input.
(4) In the present invention, according to the water temperature control method described in (3), the margin value is calculated by the following equation.
Margin value (safety factor x) (standard deviation of UA measured value)
Here, the safety factor is a constant greater than 0 and equal to or less than 5.
(5) In the present invention, the method according to any one of (1) to (4), wherein the model is a multiple regression model.
(6) In addition, in the present invention, the method according to any one of (1) to (4), wherein the model is an artificial intelligence model.
(7) The present invention is also directed to a model construction device for constructing a model for predicting a UA value indicating a product of a total heat transfer coefficient and a heat transfer area of an outdoor pipe from past meteorological data around the outdoor pipe and past operation performance data such as a water temperature and a flow rate, the meteorological data being sent from a water treatment facility having a water temperature adjustment function to a treated water utilization facility.
(8) Further, the present invention is a water temperature control system including: a water treatment apparatus having a water temperature adjustment function; a treated water utilizing apparatus; an outdoor pipe for sending water from the water treatment facility to a treated water utilization facility; and a delivery source temperature control device that controls the treated water to a delivery source target temperature, wherein the delivery source temperature control device includes: a model construction unit that constructs a model for predicting a UA value indicating a product of a total heat transfer coefficient and a heat transfer area of the outdoor pipe, based on past weather data around the outdoor pipe and past operation performance data such as a water temperature and a flow rate; a UA value prediction unit for obtaining a UA prediction value by inputting the latest meteorological data and operation data to the model; a delivery source target temperature calculation means for obtaining a delivery source target temperature from the UA predicted value and a target temperature of the treated water to be used; and a temperature control unit that controls the treated water to the delivery source target temperature.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to construct a model for predicting a UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor pipe from the past meteorological data around the outdoor pipe and the past operation performance data such as the water temperature and the flow rate, and to set the delivery source target temperature by inputting the latest meteorological data and operation data to the model. Thus, the amount of heat radiated from the surface of the outdoor pipe is estimated, and it is no longer necessary to set the delivery source target temperature to be higher than the target temperature for the use of the treated water. Therefore, according to the present invention, it is possible to easily provide a method and a system capable of reducing the amount of heat supplied from a heating unit and/or a cooling unit at a delivery source and achieving energy saving and cost saving.
Drawings
Fig. 1 is a schematic diagram showing a schematic configuration of a pure water temperature control system 1 according to the present embodiment.
Fig. 2 is a block diagram for explaining a functional configuration of the delivery source temperature control device 40 provided in the water temperature control system 1.
Fig. 3 shows an example of the frequency distribution of the UA value measured values.
Fig. 4 is a schematic diagram showing a schematic configuration of a conventional pure water temperature control system 100.
Detailed Description
The present invention is not limited to the following embodiments, and can be carried out with appropriate modifications within the intended scope of the present invention.
< overview of Water temperature control System >
Fig. 1 is a schematic diagram showing a schematic configuration of a water temperature control system according to the present embodiment.
For simplicity, the following description will be made assuming that the treated water in the water treatment facility is pure water and the water temperature control system is a pure water temperature control system, but the present invention is not limited to this. The pure water may be ultrapure water, or may be so-called functional cleaning water obtained by dissolving a gas such as hydrogen, ozone, or carbon dioxide in ultrapure water.
The pure water temperature control system 1 includes: a pure water production apparatus 10 that produces pure water based on industrial water; a pure water utilizing apparatus 20 that utilizes the pure water produced by the pure water producing apparatus 10; an outdoor pipe 30 for sending deionized water from the deionized water producing apparatus 10 to the deionized water utilizing apparatus; and a delivery source temperature control device 40 for controlling the delivery source of the pure water to a delivery source target temperature. The pure water production apparatus 10, the pure water utilization apparatus 20, and the delivery source temperature control device 40 are electrically connected to each other through a communication network 50.
[ pure water production facility 10 ]
The pure water production apparatus 10 includes: a pure water production device 11 that produces pure water based on industrial water; and a pure water tank 12 for storing the pure water produced by the pure water production apparatus 11.
For example, when the pure water utilization device 20 is a precision electronic device manufacturing plant, the temperature of pure water at the utilization destination is strictly controlled within a range of ± 0.5 ℃.
For example, when the temperature of the industrial water supplied to the pure water production facility 10 is higher than the predetermined temperature when pure water is used in the pure water utilization facility 20 as in summer, it is not necessary to steam-heat the pure water produced by the pure water production apparatus 11 in the pure water tank 12. However, when the temperature of the industrial water supplied to the pure water production facility 10 is lower than a predetermined temperature at the time of using pure water in the pure water usage facility 20 as in winter, it is necessary to steam-heat the pure water produced by the pure water production apparatus 11.
In order to steam-heat the pure water produced by the pure water production apparatus 11, a steam heater 13 is also provided in the pure water production facility 10.
Further, a delivery source thermometer 14 is provided on the outlet side of the pure water tank 12 in order to appropriately control the delivery source target temperature of the pure water.
[ pure water utilization equipment 20 ]
The pure water utilization device 20 includes: a deionized water receiving tank 21 that receives deionized water supplied from the deionized water tank 12 through the outdoor piping 30; and a cooler 22 that cools the pure water when the temperature of the received pure water is higher than a prescribed temperature at the time of using the pure water in the pure water using device 20.
In addition, in order to appropriately control the use destination temperature of the pure water, a use destination thermometer 23 is provided on the inlet side of the pure water receiving tank.
[ outdoor piping 30 ]
The length of the outdoor piping 30 is not particularly limited, and the length of the outdoor piping 130 is approximately about 0.5km to 3 km.
[ delivery source temperature control device 40 ]
The hardware configuration and the software configuration of the transmission source temperature control device 40 will be described with reference to fig. 2.
The delivery source temperature control device 40 includes: a UA value information processing device 41 that processes information on a UA value indicating a product of a total heat transfer coefficient and a heat transfer area of the outdoor piping 30; and a heating temperature determining device 42 that determines the heating temperature of the steam heater 13 provided in the pure water production facility 10. The UA value information processing device 41 and the heating temperature determining device 42 are electrically connected via a communication network 43.
[ UA information processing device 41]
The UA information processing device 41 includes: a data input server 411 that receives information transmitted via the communication network 50 and performs writing processing to a database; a database 412 for recording all the operation data and meteorological data at fixed time intervals; and a data processing server 413 that reads a part or all of the data recorded in the database 412, performs arithmetic processing, and constructs a model.
The data Processing server 413 is a control device including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The data processing server 413 reads predetermined data stored in the database 412 and executes an internal program to construct a UA value prediction model.
The data processing server 413 executes the following processing.
[ construction of UA value prediction model ]
The data processing server 413 constructs a model for predicting a UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor pipe 30 from the past weather data around the outdoor pipe and the past operation performance data such as the water temperature and the flow rate.
Next, a prediction model of the UA value will be described. The heat radiation amount q radiated from the surface of the outdoor pipe 30 is expressed by the following 2 equations.
[ numerical formula 1]
q＝WC(Tin-Tout) (1)
[ numerical formula 2]
q＝UA(ΔT)lm(2)
In the formula (1), W is the flow rate (kg/s) of deionized water flowing through the outdoor pipe 30, and C is the specific heat (kJ/kg. DEG C) of deionized water flowing through the outdoor pipe 30. T isinIs a delivery source temperature (. degree. C.) measured by a delivery source thermometer 14, ToutIs the destination temperature (. degree.C.) measured by the destination thermometer 23.
In the formula (2), U is the total heat transfer coefficient (kW/m) of the outdoor piping 302DEG C.) is the heat transfer area (m) of the outdoor piping 302)。(ΔT)lmIs the logarithmic mean temperature difference (. degree. C.).
UA is a roomThe product of the total heat transfer coefficient and the heat transfer area of the external piping 30 is an index indicating the ease of heat dissipation in the outdoor piping 30. The larger the value of UA, the more TinAnd ToutThe larger the difference.
Here, the logarithmic mean temperature difference (. DELTA.T)lmRepresented by the following equation.
[ numerical formula 3]
TinIs a delivery source temperature (. degree. C.) measured by a delivery source thermometer 14, ToutIs the destination temperature (. degree.C.) measured by the destination thermometer 23. In addition, T0Is the temperature (. degree. C.) of the outside air.
The following formulas (1) to (3) give the following formulas.
[ numerical formula 4]
The data input server 411 obtains the outside air temperature T at fixed time intervals (for example, at 1 minute intervals) via the communication network 500Delivery source temperature TinAnd the destination temperature ToutAnd the water flow rate W. Then, the data processing unit 411 records the acquired data in the database 412 together with the meteorological data (wind speed, wind direction, air temperature, humidity, sunlight, precipitation amount, and the like) around the outdoor piping 30. The meteorological data can be acquired using a commercially available meteorological observation device (a device in which meteorological sensors such as a temperature/humidity sensor, a wind direction anemometer, a solar intensity meter, and a rain gauge are integrated).
When the length of the outdoor pipe 30 is long, it may take several minutes for pure water to reach the destination from the delivery source. In this case, the destination temperature T is usedoutData is preferably used with TinThe value of the deviation of the measured time of the data. For example, when the retention time of pure water in the outdoor piping 30 is 15 minutes, it is preferable that T is set to be less thaninIs 15 minutes from the measurement timeT of after-clock measurementoutFor using the destination temperature ToutAnd (4) data. With respect to the outside air temperature T0The water supply flow rate W is preferably an average value of residence time in the outdoor piping 30.
The data processing server 413 reads a part of the data recorded in the database 412, calculates the actual measurement value of the UA value based on the expression (4), and creates a model indicating the relationship between weather information around the outdoor pipe 30 and the UA value of the outdoor pipe 30.
In the heating temperature determination device described later, the current value of UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping 30 is estimated from the model and the recent meteorological data and operation data around the outdoor piping 30, and the heating target temperature is determined.
For example, the data processing server 413 creates a data table such as table 1 from past results, where table 1 shows the relationship between the wind speed around the outdoor pipe 30 and the UA value of the outdoor pipe 30. Further, since the actual measured values of the UA values calculated based on the expression (4) have variations, both the average value and the standard deviation are shown.
[ Table 1]
Here, for simplicity, the data processing server 413 creates the data table of table 1 using only the wind speed as the meteorological condition, but the data processing server is not limited to this. As the meteorological conditions, in addition to the wind speed, a data table may be created using meteorological parameters such as the outside air temperature, humidity, sunlight, wind direction, precipitation amount, and the like.
The data processing server 413 may create a numerical expression indicating the relationship between the wind speed around the outdoor pipe 30 and the UA value of the outdoor pipe 30, instead of the data table in the form of a correspondence table as shown in table 1.
For example, when a multiple regression model is applied, it can be represented by the following numerical expression.
UA value of a0+a1X (wind speed) + a2X (Wet)Degree) + a3X (sunshine) + … (a)0、a1、a2、a3: a constant).
Alternatively, the data processing server 413 may construct an artificial intelligence model using the meteorological parameters as the explanatory variables and the UA values as the target variables by using a method such as deep learning.
The UA value prediction model created by the data processing server 413 is recorded in the server 413 itself.
[ application of UA prediction model ]
Next, the heating temperature determination device 42 inputs the latest meteorological data and operation data around the outdoor pipe 30 to the UA value prediction model recorded in the data processing server 413, and estimates the current value of the UA value. Further, "most recent" means from about 1 hour ago to the present time.
For example, when the wind speed at the current time is 8m/s, the UA value at the current time can be estimated to be 1.2kW/° c by the UA value prediction model (table 1) recorded in the data processing server 413.
The meteorological information may be used to determine parameters not only by the current meteorological information but also by future predicted values such as wind speed. For example, when the wind speed is likely to increase rapidly due to a rapid change in weather, the UA value may be determined using the expected maximum wind speed.
Further, in the pure water utilizing facility 20, there are a case where both a heating means for heating the pure water supplied from the pure water producing facility 10 and a cooling means for cooling the pure water are provided, and a case where the heating means is not provided and only the cooling means is provided as in fig. 1.
UA decision value (average of UA obtained by UA value prediction model (table 1)) + α × (standard deviation of UA in UA value prediction model (table 1))
The standard deviation herein refers to the standard deviation of UA values in the sub-data set to which the weather information around the outdoor piping 30 belongs (the standard deviation of sub-data classified by wind speed and the like as shown in table 1).
The value of the safety factor α is not particularly limited, but is basically a constant that is greater than 0 and not greater than 5. the higher the safety factor is, the higher the delivery source target temperature T of pure water isinThe higher the setting, the higher the temperature T at the destination of pure water useoutIt is safe in that it is kept fixed, but the energy saving performance is poor. For example, it is preferable that the safety factor be set low when the weather is stable, and be set high when a sudden change in the weather is expected.
The database 412 is a device for storing data and files, and is configured to include a storage unit for data such as a hard disk, a semiconductor memory, a storage medium, and a memory card.
The data processing server 413 stores a program for reading a part of the data recorded in the database 412, calculating an actual measurement value of the UA value, and constructing a prediction model of the UA value. The UA value prediction model is recorded in the data processing server 413 itself.
[ heating temperature determining device 42]
The heating temperature determining device 42 has a processing unit and a measurement data storage unit for several minutes to 1 hour, and has functions for the following purposes: the UA prediction model obtained by the processing operation of the UA information processing device 41 receives the latest weather data and operation data, estimates the UA value at the current time, and determines the delivery source target temperature of pure water based on the use destination target temperature of pure water.
[ calculation of the target temperature of the delivery source of pure Water ]
The processing unit of the heating temperature determining device 42 inputs the latest weather data and operation data to the UA prediction model obtained by the processing operation of the UA information processing device 41, estimates the UA value at the current time, and calculates the delivery source target temperature of pure water from the use destination target temperature of pure water.
The delivery source temperature T measured by the delivery source thermometer 14 according to the above equation (4)inAnd the destination temperature T measured by the destination thermometer 23outThe relationship betweenRepresented by formula (5).
[ formula 5]
In relation to the formula (5), when the formula (5) is modified to obtain TinWhen (3) is (b), the compound of formula (6) can be obtained.
[ formula 6]
A UA value prediction model is constructed by learning long-term measurement data in the past, and the UA value at the current time is estimated by applying the latest measurement data to the model, and then the UA value is set as a decision value of UA by adding a margin value. Then, the processing unit of the heating temperature determining device 42 reads the equation (6), and inputs the target temperature T of the use destination of pure wateroutVarious parameters including the above, and the target temperature T of the delivery source of pure water can be calculatedin。
[ control of delivery Source target temperature ]
Then, the processing unit of the heating temperature determining device 42 transmits the target delivery source temperature T to the pure water producing apparatus 10inThe information of (1). Thus, the steam heater 13 of the pure water producing apparatus 10 can be controlled based on the delivery source target temperature T calculated by the heating temperature determining device 42inTo adjust the amount of heat supplied.
In the present embodiment, the amount of heat supplied by the steam heater 13 is adjusted, but the present invention is not limited to this. The pure water production facility 10 may be provided with a steam heater 13 and/or a cooling device (not shown), and the degree of heating by the steam heater 13 and/or the degree of cooling by the cooling device may be adjusted when controlling the delivery source target temperature.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.
< example >
Use of the present embodimentThe water temperature control system 1 described in (1) calculates a target delivery source temperature T of pure waterin. Then, the steam heater 13 of the pure water producing apparatus 10 is operated based on the delivery source target temperature T calculated by the heating temperature determining means 42inTo adjust the amount of heat supplied. Thereafter, the cooler 22 is used to utilize the destination temperature T as neededoutRemain fixed. Then, the pure water heating heat amount of the steam heater 13 at the sending source (pure water manufacturing apparatus 10) and the pure water cooling heat amount of the cooler 22 at the use destination (pure water use apparatus 20) at this time are calculated.
The data input server 411 acquires the outside air temperature T every 1 minute via the communication network 500Delivery source temperature TinAnd the destination temperature ToutAnd the water flow rate W.
The data processing server 413 refers to the above equation (4) to obtain the actual measurement value of the UA value from the acquired data. The UA values were measured for 3 days to obtain the frequency distribution shown in FIG. 3. A data table showing the relationship between the wind speed around the outdoor pipe 30 and the UA value of the outdoor pipe 30 is created based on past results. The results are shown in Table 2. In the present embodiment, table 2 is taken as a UA value prediction model.
[ Table 2]
Subsequently, the processing unit of the heating temperature determining device 42 reads the above equation (6), and inputs the target temperature T of the use destination of pure wateroutVarious parameters including the above, and the target temperature T of the delivery source of pure waterin. When the target temperature T is at the use destination of pure wateroutThe water supply W of pure water is 200m at 24 DEG C3Calculating T under prescribed conditions in the case of/hinAs a result, TinThe temperature was 24.3 ℃.
At this time, the temperature of the pure water produced by the pure water production apparatus 11 was 21.0 ℃. In order to supply pure water of 24.0 ℃ to the pure water utilization device 20, the water in the pure water tank 12 needs to be heated from 21.0 ℃ to 24.3 ℃ by the steam heater 13. At this time, the amount of heating of pure water by the steam heater 13 at the delivery source (pure water producing apparatus 10) is 2,762MJ/h, i.e., the amount of water delivered × the specific heat of pure water × (the temperature after heating of pure water — the temperature before heating of pure water).
When the temperature of the pure water supplied from the pure water production apparatus 10 was measured using the destination thermometer 23, the result was 24.1 ℃ which slightly exceeded 24.0 ℃ which was the target temperature. Therefore, the pure water was cooled from 24.1 ℃ to 24.0 ℃ using the cooler 22. At this time, the amount of cooling heat of pure water by the cooler 22 at the destination (pure water utilizing apparatus 20) is set to 84MJ/h, i.e., the amount of water supplied × the specific heat of pure water × (the pre-cooling temperature of pure water — the post-cooling temperature of pure water).
< comparative example >
Pure water is supplied by the conventional method shown in fig. 4. The pipe inlet temperature at the thermometer 114 was set to 25.0 ℃ in consideration of heat dissipation from the surface of the water supply pipe.
The temperature of the pure water produced by the pure water production apparatus 11 was 21.0 ℃ in the same manner as in the examples. In order to supply pure water of 24.0 ℃ to the pure water utilization device 120, the water in the pure water tank 112 needs to be heated from 21.0 ℃ to 25.0 ℃ using the steam heater 113. At this time, the amount of heating of pure water by the steam heater 113 at the delivery source (pure water producing apparatus 110) was 3,348MJ/h, i.e., the amount of water delivered × the specific heat of pure water × (the temperature after heating of pure water — the temperature before heating of pure water).
When the temperature of the pure water supplied from the pure water manufacturing apparatus 110 was measured by using the destination thermometer 123, the result thereof was 24.8 ℃ exceeding the target temperature of 24.0 ℃. Therefore, the pure water is cooled from 24.8 ℃ to 24.0 ℃ using the cooler 122. At this time, the amount of cooling heat of pure water by the cooler 122 at the destination (pure water utilizing apparatus 120) is 670MJ/h, the amount of water supply × the specific heat of pure water × (the pre-cooling temperature of pure water — the post-cooling temperature of pure water).
< results: reduction of Heat quantity >
As described above, when the water temperature control system 1 described in the present embodiment is used, the amount of pure water heating by the steam heater 13 at the delivery source (pure water production facility 10) can be reduced by 18%, and the amount of pure water cooling by the cooler 22 at the use destination (pure water use facility 20) can be reduced by 87%.
According to the present embodiment, it is possible to construct a model for predicting a UA value representing the product of the total heat transfer coefficient U and the heat transfer area a of the outdoor pipe 30 from the past weather data around the outdoor pipe 30 and the past operation performance data such as the water temperature and the flow rate, and set the delivery source target temperature T of deionized water by inputting the latest weather data and the operation data to the modelin. Thus, it is no longer necessary to estimate the amount of heat radiated from the surface of the outdoor pipe 30 to adjust the transmission source target temperature TinSet to a target temperature T for use of pure wateroutToo high in terms of noise. Therefore, according to the present embodiment, the amount of heat supplied to both the steam heater 23 at the pure water supply source and the cooler 22 at the pure water use destination can be reduced, and as a result, a method and a system that can achieve energy saving and cost saving can be provided easily.
Description of the reference numerals
1: a water temperature control system; 10: a pure water production facility; 11: a pure water producing device; 12: a pure water tank; 13: a steam heater; 14: a delivery source thermometer; 20: pure water utilization equipment; 21: a pure water receiving tank; 22: a cooler; 23: using a destination thermometer; 30: outdoor piping; 40: a delivery source temperature control device; 50: a communications network.
Claims (8)
1. A water temperature control method, wherein,
in the process of supplying the temperature-adjusted water to the water use destination through the outdoor piping,
constructing a model for predicting a UA value representing a product of a total heat transfer coefficient and a heat transfer area of an outdoor pipe from past meteorological data and past operation performance data around the outdoor pipe,
the UA value at the current time is determined by inputting the most recent meteorological data and operational data into the model,
calculating a delivery source target temperature based on the UA decision value and a water usage destination target temperature,
adjusting the supply heat of a heating unit and/or a cooling unit of water at the delivery source according to the delivery source target temperature.
2. The water temperature control method according to claim 1,
the delivery source target temperature is calculated by the following equation:
the delivery source target temperature is equal to the outside air temperature + (use destination target temperature — outside air temperature) × EXP { UA predicted value/(outdoor pipe water delivery flow rate × specific heat of water) }.
3. Water temperature control method according to claim 1 or 2,
the UA decision value is calculated by inputting recent meteorological data and operation data to the model and adding a predetermined margin value to the UA predicted value obtained by the input.
4. Water temperature control method according to claim 3,
the margin value is calculated by the following equation:
margin value (safety factor x) (standard deviation of UA measured value)
Here, the safety factor is a constant greater than 0 and equal to or less than 5.
5. The method according to any one of claims 1 to 4,
the model is a multiple regression model.
6. The method according to any one of claims 1 to 4,
the model is an artificial intelligence model.
7. A model construction device constructs a model for predicting a UA value representing a product of a total heat transfer coefficient and a heat transfer area of an outdoor pipe for sending water from a water treatment facility having a water temperature adjustment function to a treated water utilization facility, based on past meteorological data and past operation performance data around the outdoor pipe.
8. A water temperature control system is provided with:
a water treatment apparatus having a water temperature adjustment function;
a water utilizing apparatus that utilizes the treated water of the water treating apparatus;
an outdoor pipe for sending water from the water treatment facility to the water utilization facility; and
a delivery source temperature control device for controlling the delivery source target temperature,
wherein the delivery source temperature control device includes:
a model construction unit that constructs a model for predicting a UA value representing a product of a total heat transfer coefficient and a heat transfer area of an outdoor pipe from past meteorological data and past operation performance data around the outdoor pipe;
a UA value prediction unit that obtains a UA prediction value by inputting the most recent meteorological data and operation data around the outdoor piping to the model;
a delivery-source target temperature calculation unit that obtains a delivery-source target temperature from the UA predicted value and a water use destination target temperature; and
and a temperature control unit for controlling the delivery source to the target temperature of the water delivery source.
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| JP2017204303A JP6508287B1 (en) | 2017-10-23 | 2017-10-23 | Water temperature control method, water temperature control system and model construction device |
| PCT/JP2018/033758 WO2019082537A1 (en) | 2017-10-23 | 2018-09-12 | Water temperature control method and system |
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| CN111861307A (en) * | 2020-06-16 | 2020-10-30 | 北京农业信息技术研究中心 | Fruit multivariate quality space-time distribution sensing method and system |
| CN114294832A (en) * | 2017-10-23 | 2022-04-08 | 栗田工业株式会社 | Water temperature control method and system and model construction device |
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| CN112053027B (en) * | 2020-07-17 | 2024-05-24 | 国网山东省电力公司电力科学研究院 | Online verification method and system for minimum operation mode of thermal power plant |
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| JP6508287B1 (en) | 2019-05-08 |
| JP2019079172A (en) | 2019-05-23 |
| CN114294832A (en) | 2022-04-08 |
| WO2019082537A1 (en) | 2019-05-02 |
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