JPH0568961A - Quality control of cooling water - Google Patents

Abstract

PURPOSE:To prevent the deterioration of cooling water by keeping the base blow-down quantity of circulated cooling water constant and using the electrolytic treatment of water and/or the remote monitor and control of water quality in combination. CONSTITUTION:A flowmeter 104 and an electromotive valve 105 are provided to the blow-down main piping 103 branched from circulating water main piping 102 and the opening and closing degree of the electromotive valve 105 due to a blow-down water quantity communication controller 121 is set by using the control ensuring a definite amount of base blow-down water and the control due to the conductivity sensor 113 or pH sensor 114 of a sensor box 111 in combination and a definite amount of base blow-down water is ensured at the time of the driving of a cooling water circulating pump or the fan of a cooling tower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water quality control method by a circulation system for a wide range of applications such as cooling water for air conditioning in buildings and factories, cooling water for industrial plants, cooling water for agricultural facilities and the like.

[0002]

2. Description of the Related Art Although cooling water for air conditioning in buildings, factories, etc., cooling water for industrial plants, cooling water for agricultural facilities, etc. are also available for temporary cooling, as shown in FIG. The cooling tower 1 is installed, cooling water is recirculated between the cooling tower 1 and the heat exchanger 2 by the pump 3, and the cooling water is supplied to the cooling tower 1 for cooling.
It is circulated and reused as cooling water.

Since this circulating cooling water is evaporated in the cooling tower 1, calcium ions, magnesium ions, ionic silica, etc., which are some of the constituent components of the rock dissolved in the makeup water, are concentrated. However, it adheres to the heat transfer surface of the refrigerator as a hard scale, which causes the heat transfer effect to be reduced.

In order to prevent the scale from adhering to the heat transfer surface due to the concentration of the circulating water, a certain proportion of the circulating water is discharged (blowdown) out of the system to replenish the fresh water with the scale in the circulating water. A method of suppressing the increase in the concentration of the components and preventing the scale from adhering to the heat transfer surface for a long time is exclusively used.

The circulating water blowdown method is currently (1) a branch pipe is provided in the middle of the cooling water pipe, and the blowdown water amount is determined by adjusting a valve attached to the branch pipe, or water is sprayed in a cooling tower. Quantitative blowdown method in which a certain amount of the water is blown down using a gutter, etc., and (2) As shown in FIG. 8, the property that conductivity increases as the concentration of circulating water increases, Conductivity is detected, and a preset conductivity is set so that the circulating water is blown down by ON / OFF control of opening / closing of the electromagnetic valve or the electric valve 4 to prevent the concentration of the circulating water from proceeding. Two of the blow-down methods by K.K. are mainly adopted.

[0006] Further, since the cost of water has increased recently, it also serves to reduce the cost of water in urban areas and prevent various kinds of damages such as corrosion, slime containing algae, scales, legionella, etc. occurring in the circulating water circuit. The water treatment method by injecting a water treatment agent has begun to spread in a form combined with the above-mentioned quantitative blowdown control method for circulating water or the blowdown control method by set conductivity.

[0007]

However, the above-mentioned conventional water quality control methods have the problems listed below.

(1) Since the source of cooling water is river water, well water, lake water, etc., make-up water, except well water deeper than 40 meters underground, should be used as cooling water depending on the amount of rainfall. The concentration of scale components is affected. When the amount of rainfall is large compared to when it is small, the concentration of calcium ions, magnesium ions, and ionic silica in the scale component in the makeup water tends to be low, and scale is relatively difficult to attach, which is convenient as makeup water. ..

(2) When the circulating water blowdown method is a quantitative blowdown method, it is impossible to change the blowdown water quality of the circulating water in a manner that follows the fluctuation of the makeup water quality as described above. From the aspect of water quality maintenance, there are many problems that the amount of blowdown water is either excessive or insufficient compared to the amount of blowdown water at the management standard water quality.

(3) In order to maintain the control reference value of the blowdown water amount, a method of detecting the conductivity of the circulating water and controlling the blowdown water amount by the set conductivity at the control reference value is used. Has been.

In this case, although the quality of the circulating water by the quantitative blowdown method is improved, even if the water quality fluctuation range of the makeup water is large and frequently fluctuates, the fluctuation factors are sufficiently absorbed and eliminated. It is usually not done. Further, as shown in FIG. 6, slime or scale may be attached to the conductivity measurement sensor to reduce the sensitivity of the sensor, and this decrease in the sensitivity of the sensor leads to an excessive concentration of the circulation water, and In terms of water quality management, the decrease in sensor sensitivity has become a problem.

(4) Some water treatment agents contain a high molecular weight organic compound or an organochlorine compound which is a carcinogen as a component, and the amount of the chemical agent mixed in the blowing water of the cooling water is the drinking water. In almost all cases, it is discharged directly to the river water that is the water source, and there is a risk that it will be mixed into groundwater or drinking water. In addition, water pollution and water pollution of rivers, lakes, marine, underground, etc. will progress with the increase in the amount of water treatment agents used, and so far it has not been exposed and has not become a social problem. It is true that there are considerable problems with increasing usage of.

(5) A worker must go to the site every time to change the amount of blowdown water per unit time or to change the amount of blowdown water according to the set conductivity in the above-mentioned quantitative blowing method of circulating water. It is a work that requires manpower. Also, when using a water treatment agent, it is necessary to periodically replenish the agent, and it is necessary to additionally perform water quality analysis to check the operation of the agent injection pump, check the agent concentration, and check the circulating water quality. ..

[0014] Further, the sensitivity check of the conductivity measuring sensor, the cleaning of adhering substances, etc. are required, and thus it requires manpower having specialized knowledge, but it is becoming difficult to secure the manpower year by year.
In addition, the annual increase in personnel costs is a factor that increases water quality management costs.

(6) The circulating water is constantly concentrated in the cooling tower due to the evaporation of water, and the scale components dissolved in the makeup water are brought into the system. If not taken, it will cause scale disorders due to the accumulation of scale components (overconcentration), and the water temperature will be about 25 ° C to 33 ° C, and the nutrient source of microorganisms will always be supplied from makeup water. As a result, it has become a favorable condition for the reproduction of microorganisms, and there are problems caused by the reproduction of Legionella bacteria, which are said to be the source of respiratory diseases such as local military illness, and the occurrence of algae and slimes.

(7) In addition, dissolved oxygen is present in the makeup water and circulating water in an amount of 8 to 9 mg / l, and water is present due to scale deposits and algae and slime deposits in the circulating water pipe. As a result, the oxygen concentration cell phenomenon occurs at the place where foreign matter adheres to the inner surface of the pipe, and a corrosion failure that causes pitting corrosion on the metal material also occurs.

(8) Further, in the case where the atmosphere is contaminated with SOx and NOx gases, these gases are sucked into the circulating water from the cooling tower to move the pH value of the circulating water to the acidic side. This acidification of the pH causes corrosion damage to the piping material.

(9) Recently, a gas / heavy oil-fired engine capable of supplying electricity and heat with city gas or heavy oil as a fuel and heat supply with high efficiency, a power generation facility by a gas turbine drive, a waste heat recovery facility, a fuel cell So-called cogeneration equipment such as equipment is beginning to spread. Cooling water is required to cool this equipment, but if the quality control of this cooling water is insufficient, there will be obstacles such as adhesion of scale to the heat transfer section, corrosion in the cooling water circuit, and slime. However, there is a problem that stable power and heat cannot be supplied, and these facilities that require cooling water have a power generation scale of several kwh per base station.
From 1 to several thousand kilowatts have begun to be installed in factories and buildings, and in the future, installation of cogeneration equipment tends to increase due to difficulty in new construction of large power plants and energy saving. This equipment requires much more rigorous water quality control than the conventional cooling water control, and requires a large number of water quality control engineers with specialized knowledge and abundant experience.

(10) Recently, the number of Japanese companies constructing factories overseas is increasing and the scale is increasing, and high quality maintenance is required in terms of water quality control of cooling water, but it is not always necessary. There is a problem that it is in a state where it can not be said that it has fully responded.

(11) In order to save water, the use of middle water has become an issue. However, since wastewater containing a large amount of organic matter, measures against slime are indispensable. Is becoming

(12) As described above, the management of the cooling water is to first strictly control the blowdown amount of the circulating water according to the quality of the makeup water, and then to control the scale generated during long-term operation. It is important to take into consideration preventive measures against damage such as corrosion and slime.

From the viewpoint of the cost of water quality management, the cost of water quality management personnel increases, the number of technically educated personnel is secured, the amount of water used is saved, the water pollution of wastewater due to chemicals used is expanded, and strict water quality management is insufficiently enforced. Also, from an environmental standpoint, ground subsidence due to excessive pumping of groundwater used as makeup water, scattering of harmful bacteria that propagate in the cooling tower and the circulation circuit of the cooling water into the atmosphere, and the discharge of wastewater by the water treatment chemicals used. There are many problems such as water pollution.

In order to solve the above-mentioned problems, the present invention enables water quality management with high quality and economical efficiency without using a water treatment agent, and at the same time protects equipment and water environment. It is an object to provide a water quality control method for cooling water that enables water quality control by remote monitoring and control.

[0024]

In order to solve the above-mentioned problems, the present invention controls the opening and closing degree of a cooling water blowdown water amount control valve at a constant level when a cooling water circulation pump or a cooling tower fan is driven. Valve control to ensure the amount of base blowdown water and conductivity or pH of circulating water
Using a valve control that adjusts the desired blowdown water amount based on the value, the opening and closing degree of the water amount control valve is controlled to secure a certain amount of base blowdown water, thereby controlling the cooling water quality. It was adopted. Furthermore, the electrolytic water treatment device is attached to the above method, and the electrolytic water treatment of circulating water and / or makeup water is also used. This is a method of managing the quality of the cooling water that is becoming more diverse.

Further, the performance of the electrolyzed water treatment device is also limited, and securing a certain amount of the base blowdown water as described above suppresses the amount of deposits on the inner surface of the electrolyzed water treatment device to maximize its performance. It has a role to play to the limit.

[0026]

[Function] In controlling the opening / closing degree of the cooling water blowdown water amount control valve, the valve control that secures a certain amount of base blowdown water, and the desired blowdown water amount is adjusted based on the conductivity or pH value of the circulating water. Controlling the blowdown water amount between the blowdown setting value based on conductivity or pH and the base blowdown water amount by securing the base blowdown water amount to ensure a certain amount of cooling water. Prevent water quality deterioration. And further, circulating water and / or makeup water is treated with an electrolytic water treatment device,
Preventing deterioration of the cooling water quality by remotely monitoring and controlling the water quality.

[0027]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1 FIG. 1 shows a control method used when the quality of cooling water is controlled only by adjusting the blowdown amount of circulating water.
Is a circulating water main pipe (inlet side), which serves as a water supply side pipe to the circulating water blowdown branch pipe, 102 is a circulating water main pipe (outlet side), and 103 is a blowdown water main pipe, and a blowdown water main pipe Reference numeral 103 is connected to both main pipes 101 and 102 in a T-shaped branch. Therefore, the water to be supplied to the main pipe 101 is separated into water that circulates through the main pipe 102 and blowdown water that is discharged to the outside of the system through the blowdown water main pipe 103.

Reference numeral 104 denotes a flow meter, which is capable of performing the flow rate of blowdown water per unit time and its integration, displaying the flow rate on site, and transmitting and inputting data to the controller. Reference numeral 105 denotes an electric valve, which constitutes a part of a controller that adjusts the blowdown water amount, and the electric motor can be operated by a control signal from the blowdown water amount controller to change the opening / closing degree of the valve. It works. This electric valve can be used not only as a ball valve but also as a butterfly valve, and any type of valve can be used as long as the flow rate / open / closed relationship can be linearly controlled.
An electromagnetic valve can be used instead of this electric valve, but the controllability of the blowdown water amount becomes worse than that of the electric valve.

Reference numeral 106 denotes a circulating water blowdown water drain pipe, and 1
07 is a sensor box water supply pipe, 108 is a different diameter pipe,
The drain pipe 10 is branched from the blowdown water main pipe 103.
6 and the water supply pipe 107 are connected. The flow meter 104 is attached in the middle of the blowdown water main pipe 103, and the electric valve 105 is attached in the middle of the drain pipe 106.

Reference numeral 109 is a feed water flow controller, 110 is a sight glass, 111 is a sensor box, 112 is an underwater electrolytic water treatment device, and the feed water flow controller 109 is such that the water supply amount to the sensor box 111 is about 50 to 60 liters per hour. The size is such that the connection diameter is 25 A, the sight glass 110 is attached, and the size of the flowing water and the color of the supplied water can be seen through.

Water is supplied by a water supply pipe 107, a different diameter pipe 108, a water supply flow rate controller 109, and an underwater electrolytic water treatment device 112, which are connected by pipes. 1
13 is a conductivity sensor, 114 is a pH sensor, 115
Is a tightening seat for the conductivity sensor 113 and the pH sensor 11
4 are both mounted in the sensor box 111 and used for measuring the water quality of the circulating water as the water supply, and are immersed in the water.

The sensor box 111 is divided into two parts, a lower container part and an upper lid part, and it is easy to remove and clean the built-in underwater electrolytic processor 112, conductivity sensor 113, and pH sensor 114. It is configured such that a rubber packing is sandwiched between the tightening seats 115, and the upper lid and the lower container part are fixed by the tightening seats 115 with bolts or clips to prevent water leakage. There is.

Reference numeral 116 denotes a sensor box water supply drain pipe,
Reference numeral 117 is a drainage nozzle, 118 is a cleaning nozzle, and the drainage pipe 116 and the drainage nozzle 117 are attached to the sensor box 111, respectively, so that the water supply to the sensor box 111 is not excessively pressurized in the sensor box 111. The water is drained to the drain through the drain pipe 116.
The drainage nozzle 117 and the cleaning nozzle 118 are used only when cleaning the inside of the system circuit, and are normally closed. An air bleeding valve 128 is normally closed.

119 is a conductivity meter, 120 is a pH meter, 12
1 is a blowdown water quantity communication controller, 122 is a power switchboard, 123 is a communication cable, and 124 is a power cable.
These are used for controlling the flow rate of the blowdown water amount by connecting the respective devices with the communication cable 123 and the power cable 124 between the flow meter 104, the electric valve 105, the conductivity sensor 113, and the pH sensor 114. It is structured and working.

The conductivity meter 119 uses the signal detected by the conductivity sensor 113 as an input signal, and displays the conductivity, the control signal of the electric valve 105 and the measurement data by the communication cable 1.
It has a function of transmitting and inputting to the blowdown water amount communication controller 121 via 23. The pH meter 120 uses the signal detected by the pH sensor 114 as an input signal, and transmits the pH value display, the control signal of the electric valve 105, and the measurement data to the blowdown water amount communication controller 121 via the communication cable 123. , With the ability to enter. The blowdown water amount communication controller 121 transmits a measurement signal from the flowmeter 104,
The input signal, the transmission from the conductivity meter 119, the input signal,
Based on the three signals of the transmission and input signals from the pH meter 120,
The control signal calculator of the built-in electric valve 105 calculates a control signal and outputs the control signal of the electric valve 105. The electric power distribution board 122 includes opening / closing driving power of the electric valve 105, the flow meter 104, the conductivity meter 119, the pH meter 120,
It is used as a data board of the blowdown water quantity communication control board 121, transmission / reception of control signals, and a power distribution board of the input / output power source.

The blowdown water amount communication controller 121 incorporates a control mechanism for determining the degree of opening / closing of the electric valve 105, with 80 to 90% of the theoretical blowdown water amount of circulating water as the base blowdown water amount. Like
It is possible to prevent an excessive shortage of the dubo down water amount due to a decrease in the sensitivity of the sensor due to the attachment of dirt to the conductivity sensor, which occurs when the water quality is controlled by the normal set conductivity.

The control of the amount of blowdown water in the first embodiment is usually carried out by controlling the amount of blowdown water according to the refrigerating capacity of the cooling equipment, the operating time, and the set value of the conductivity or pH value corresponding to the quality of the makeup water. It is designed to operate only within the drive time of the pump or cooling tower fan. Therefore, it is possible to prevent an excessive amount of blowdown water from circulating water from flowing out of the system.

Further, since the electrolytic water treatment device is installed in the sensor box, the adherence of dirt to the conductivity sensor and the pH sensor is prevented, and thus there is an advantage that the sensitivity of the sensor is less likely to decrease than the conventional method. ..

125 is a strainer, 126 is a union or flange joint, and 127 is a valve. The union or flange joint 126 facilitates the removal of the equipment constituting the system from the pipeline. The valve 127 is normally open, but it can be closed if necessary.
For convenience, it is provided at various points in the pipe together with the union or the flange joint 126.

It is also possible to remotely monitor and remotely control the water quality control device from a remote control center. In this case, the blowdown water quantity communication controller 121
A water quality control data transmitter and a blowdown water volume control signal receiver are installed inside, and the water quality control of circulating water is performed by a two-way communication through a communication line between a remote control center and this terminal water quality control device. It has a structure and mechanism that enables

From the above, this water quality control device has a refrigerating capacity and an operating time of the cooling equipment, conditions suitable for the quality of the makeup water,
For example, when the water quality of the makeup water is a stable water quality containing relatively few scale components, the water quality of the circulating water is 200 mg / l or less of calcium hardness, and 50 mg / l of ionic silica.
It is applicable when controlling the quality of circulating water below, and it is possible to install and pipe each component at the site of water quality management.
By integrally assembling and attaching the structure shown in FIG. 1 in a storage case in a factory or the like, it is possible to reduce the manufacturing period and the cost of manufacturing and selling the device by mass production in the factory by standardization.

Example 2 This Example 2 is a water treatment method used when replenishing water is water containing a large amount of scale components such as groundwater, or when a higher concentration control is performed than in Example 1 described above. In No. 2, the electrolyzed water treatment device shown in FIG. 2 is mounted in the circulating water main pipe of the system shown in FIG. This electrolyzed water treatment device can be installed in the main pipe of makeup water in the same manner as in the installation of circulating water in FIG. 2 to obtain a better effect as compared with the case of being installed only in the main pipe of circulating water. be able to.

The second embodiment will be described with reference to FIG.
Reference numeral 1 is an electrolyzed water treatment device, 202 is a three-way switching valve, 203 is a short pipe with a cleaning nozzle, 204 is a bypass pipe, and 205 is a cleaning nozzle. As shown in FIG. The flange joint 126, the cleaning nozzle-equipped short pipe 203, and the three-way switching valve 202 are arranged and connected outward in this order.
It is connected to one side of the character connecting port and the bypass pipe 204 so as to straddle the electrolytic water treatment device 201.

This electrolytic water treatment device 201 is a circulating water main pipe 1
01 (inlet side) and the circulating water main pipe 102 (outlet side), the blowdown water branch pipe 103 of the circulating water main pipe, the circulating water main pipe 101 (inlet side) side from the branch point. The installation location does not matter as long as it is in the middle of the piping line. The output of the electrolyzed water treatment device 201 is 0.
1 to 1 volt, current 0.1 to 2μ ampere,
J. K. Industries, Inc. , Japan
"Ion Clean" manufactured can be exemplified.

The three-way switching valve 202 is normally used as a manually operated valve, but can also be used as an electrically operated valve. When the electrolyzed water treatment device 201 needs cleaning, a water quality control device incorporating an automatic cleaning mechanism can be provided by using an electric three-way switching valve. Circulating water normally passes through the electrolytic water treatment device 201 and undergoes electrolytic treatment. However, when cleaning of the electrolytic water treatment device 201 is required, the water flow direction of the three-way switching valve 202 is directed to the bypass pipe 204 side. There is an advantage that the operation of the cooling equipment can be continued without switching the circulating water to the electrolytic water treatment device 201 by switching. Ensuring the blowdown water amount of the circulating water in the second embodiment is the first embodiment.
Since the above system can be used as it is, the water quality control of the cooling water which is more sophisticated than that of the first embodiment can be performed.
Further, as in the first embodiment, the electrolyzed water treatment device 201, the three-way switching valve 202, and one block up to the bypass pipe 204 are integrated into the storage case together with the devices of the first embodiment, and are integrated to mount the water quality control. A device can be provided.

Example 3 The system shown in FIG. 3 can be applied when the fluctuation range of the quality of makeup water is large and when medium water is used as makeup water. In the case of the third embodiment, since the water quality management system on the circulating water side can be applied to the first and second embodiments as they are, the description of the circulating water side will be omitted, and the makeup water side will be described in detail below.

In FIG. 3, 301 is a makeup water main pipe (inlet side), 302 is a makeup water main pipe (outlet side), 303 is a sensor box water supply pipe, 304 is an electrolyzed water treatment device, 30
5 is a three-way switching valve, 306 is a short pipe with a cleaning nozzle, 3
Reference numeral 07 is a bypass pipe, 318 is a cleaning nozzle, 126 is a union or flange joint, and the electrolytic water treatment device 30 is used.
4, a union or a flange joint 126, a short pipe 306 with a cleaning nozzle, and a three-way switching valve 305 are mounted outward in this order, and both three-way switching valves 305 are installed.
A bypass pipe 307 is integrally connected to one of the connection ports so as to straddle the electrolytic water treatment device 304. The electrolytic water treatment device 304 is attached to the makeup water main pipes 301 and 302 by the strainer 32 of the makeup water main pipe 301 (inlet side).
1'to the branch connection part of the sensor box water supply pipe 303. Make-up water to the cooling tower is supplied from the make-up water main pipe 301 (inlet side), and is supplied to the electrolytic water treatment device 304.
The main water supply pipe 302 (outlet side) and the sensor box water supply pipe 303 are supplied through the two passages.

Reference numeral 308 is a different diameter pipe, 309 is a feed water flow rate controller, 310 is a sight glass, 311 is a sensor box, and 312 is an underwater electrolytic water treatment device.
Is used for pipe connection for further narrowing the water supply flow rate from the sensor box water supply pipe 303 to the sensor box 311. The water supply flow rate controller 309 is for adjusting the water supply amount to the sensor box 311. Is used for inspection of water supply flow rate.

Water supply to the sensor box 311 may be about 50 to 60 liters per hour as in the case of measuring the quality of circulating water.
This is performed through the underwater electrolytic water treatment device 312. 313 is a conductivity sensor, 314 is a pH sensor, 315 is a fastening seat, 316 is a sensor box drain pipe, 319 is a drain nozzle, and the configuration and functions are similar to those in FIG. 1 in the case of water quality control of circulating water. Is. Sensor box drain pipe 31
6 is connected to the makeup water main pipe 302 (outlet side) to supply water to the cooling tower as a part of the makeup water, or is supplied as makeup water in a pipe separate from the makeup water main pipe 302 (outlet side) Or in some cases drainage to drainage. 323
Is an air bleeding valve, which is normally closed.

319 is a conductivity meter, 320 is a pH meter, 32
Reference numeral 1 is a communication cable, 322 is an electric power cable, and the water quality data of the makeup water measured by the conductivity meter 319 and the pH meter 320 is used as a blowdown water quantity control signal for circulating water, and the blowdown water quantity is passed through the communication cable 321. It is a mechanism for transmitting and inputting to the communication controller 121. It is desirable to adopt the system of Example 3 when strict water quality control of circulating water is used or when middle water is used as makeup water.

In this system, the circulating water can be highly concentrated and controlled, and the conventionally used water treatment agent is unnecessary except in special cases. In the case of this Example 3, the content of the scale component in the circulating water has a calcium hardness of 1000 m.
If g / l or less and ionic silica 250 mg / l or less, the performance of the electrolyzed water treatment devices 201 and 304 can be sufficiently exerted, and not only scale adhesion obstacles but also slime, corrosion and other obstacles can be prevented. Becomes

Example 4 Configuration of the cooling water system when the pH value of the circulating water drops to 7 or less when the outside air containing a large amount of SOx and NOx gas, which are acidic substances in the atmosphere, is sucked into the circulating water from the cooling tower. Corrosion damage often occurs in materials and is used to prevent this corrosion damage. To prevent this corrosion damage, when the pH value of the circulating water is on the acidic side of 7 or less, inject an appropriate amount of alkaline solution such as caustic soda into the circulating water and adjust the pH value to 8-9. It is possible to sufficiently cope with this by using together with the electrolyzed water treatment device.

In FIG. 4, 401 is an alkaline solution tank, 402 is an alkaline solution feeder, 403 is an alkaline solution injecting hose, 404 is a check valve, a 405 feeder controller, 406 is a communication cable, and 407 is a power cable. The tank 401 may be made of any material as long as it is alkali resistant, but generally, it is made of hard vinyl chloride. As the alkaline liquid feeder 402, a diaphragm pump is used, which can adjust, start, and stop the amount of liquid to be supplied by a pulse signal, and one which is connected to a feeder controller 405 and is capable of remote monitoring control. At this time, the pH is controlled by the pH meter of the water quality management device for circulating water of Examples 1 and 2.

For the injection of the alkaline solution into the circulating water main pipes 101 and 102, an interlock circuit for separately operating the alkaline solution feeder 402 is prepared only when the circulating water pump is driven, and power is supplied by the power cable 407. The alkaline liquid injection hose 403 is connected to the inside of the alkaline liquid tank 401 by a pipe between the alkaline liquid feeder 402 and the check valve 404, and the alkaline liquid feeder 402 is driven. Check valve 40
Although 4 is attached to the circulating water main pipe 102 (outlet side), it may be attached to the circulating water main pipe 101 (inlet side).

Embodiment 5 In Embodiment 5, the above Embodiments 1, 2, 3 and 4 are used as water quality control devices for terminals, and they are remotely monitored by bidirectional communication using a communication line from a remote control center. This is a management system that is necessary for controlling the quality of circulating water with high quality and more labor saving.

In FIG. 5, 501 is a terminal water quality control device, 502 is a fixed communication base, 503 is a mobile communication base,
Reference numeral 504 is a communication satellite, 505 is a wired or wireless communication line, 506 is a wireless communication line, and 507 is an antenna or a communication transmitting / receiving terminal. Blowdown water amount per unit time of water quality control data measured by the terminal water quality control device 501, conductivity and pH value of circulating water and makeup water, operating status of circulation pump and cooling tower fan, and operation of other refrigeration equipment, etc. Data and the like can be transmitted from the antenna 507 installed in the terminal water quality management device or the communication transmitting / receiving terminal to the fixed communication base 502 which is the control center. Fixed communication base 502
Determines an appropriate control value of the blowdown water amount of the terminal water quality management device 501 based on the input signal started from the terminal water quality management device 501, and the wired or wireless communication line 5
05, the control signal of the device is transmitted to and output from the water quality control device 501 equipped with the antenna 507 or the communication transmitting / receiving terminal, thereby functioning as a center for controlling the water quality of the circulating water. Also, this fixed communication base 50
2 is a plurality of terminal water quality management devices 50 in remote areas including overseas
It has a function of inputting / outputting water quality management data and control signals at any time by bidirectional communication with the communication satellite 504 and the mobile communication base 503 via the wireless communication line 506. The mobile communication base 503 is effective for smoothly performing the maintenance service of the terminal water quality management device 501, and both the terminal water quality management device 501 and the fixed communication base 502 use the communication satellite 504 and the wireless communication line 506 to make digital signals. The fixed communication base 502 has a control function.

[0058]

[Effect] As described above, according to the present invention, the base blowdown water amount of the cooling water is ensured to be constant, so that the measuring ability of the sensor for measuring the conductivity or pH value of the circulating cooling water is lowered. In addition, it is possible to suppress the deterioration of the cooling water quality and prevent the occurrence of a failure in the cooling water circulation system passage.

Further, by using the electrolytic water treatment device for the treatment of the cooling water, it is possible to manage the cooling water quality with a more labor-saving quality and high economic efficiency without using a water treatment agent. It can contribute to the conservation of equipment and water quality environment, and the use of tap water. In addition, by utilizing the remote monitoring and control system of this method between a plurality of terminal water quality control devices and control centers at remote locations, it is possible to predict various types of obstacles that may occur in the cooling water system.
Preventive measures are possible, the quality of maintenance services can be improved, labor can be saved, and economic efficiency can be further improved.

[Brief description of drawings]

[Fig. 1] System diagram of cooling water quality control system using circulating water blowdown system

[Fig. 2] Piping diagram for mounting electrolytic water treatment equipment on circulating water main piping

FIG. 3 is a system diagram of a cooling water quality control device having a communication control function.

[Fig. 4] Mounting diagram of alkaline liquid injection device for pH adjustment of circulating water

[Fig. 5] Remote monitoring of terminal water quality management device by communication line,
Control system schematic diagram

FIG. 6 is a graph of the actual blowdown water amount by the conventional blowdown method.

FIG. 7 is a graph of the actual blowdown water amount according to the base blowdown method of the present invention.

FIG. 8 is an explanatory diagram showing a usage state of cooling water.

[Explanation of symbols]

 101 circulating water main pipe (inlet side) 102 circulating water main pipe (outlet side) 103 blowdown water main pipe 104 flow meter 105 electric valve 106 circulating water blowdown water drain pipe 107 sensor box water supply pipe 108 different diameter pipe 109 feed water flow rate Regulator 110 Sight glass 111 Sensor box 112 Submersible electrolyzed water processor 113 Conductivity sensor 114 pH sensor 115 Tightening seat 116 Sensor box Drain pipe for water supply 117 Drainage nozzle 118 Cleaning nozzle 119 Conductivity meter 120 pH meter 121 Blowdown Water quantity communication controller 122 Power distribution board 123 Communication cable 124 Power cable 125 Strainer 126 Union or flange joint 127 Valve 128 Air bleeding valve 201 Electrolytic water treatment device 202 Three-way switching valve 203 Washing nose Short pipe with rule 204 Bypass pipe 205 Cleaning nozzle 318 Cleaning nozzle 319 Conductivity meter 320 pH meter 321 Communication cable 322 Power cable 301 Makeup water main pipe (inlet side) 302 Makeup water main pipe (outlet side) 303 Sensor box water supply Pipe 304 Electrolyzed water treatment device 305 Three-way switching valve 306 Short pipe with cleaning nozzle 307 Bypass pipe 308 Different diameter pipe 309 Water supply flow controller 310 Sight glass 311 Sensor box 312 Water type electrolyzed water treatment device 313 Conductivity sensor 314 pH sensor 315 Tightening seat 316 Sensor box Drain pipe 317 Drain nozzle 323 Air bleed valve 401 Alkaline liquid tank 402 Alkaline liquid feeder 403 Alkaline liquid injection hose 404 Check valve 405 Feed controller 406 Communication cable 407 power cable 501 terminal water quality management device 502 fixed communication base 503 mobile communication base 504 communications satellite 505 wired or wireless communication line 506 wireless communication line

Claims (5)

[Claims] 1. A valve control for ensuring a certain amount of base blowdown water when a cooling water circulation pump or a cooling tower fan is driven, and a conductivity of circulating water for controlling the opening / closing degree of a cooling water blowdown water amount control valve. Alternatively, in combination with valve control that adjusts the desired blowdown water amount based on the pH value, the water quality control is performed by controlling the opening / closing degree of the water amount adjusting valve to secure a certain amount of base blowdown water. A water quality control method for cooling water, which is characterized in that 2. The treatment of water for use as water according to claim 1, wherein weak electric energy having a voltage of 0.1 to 1 V and a direct current of 0.1 to 2 μAm is applied to the circulating water and / or the makeup water. Water quality control method for cooling water described. 3. An alkaline liquid is injected into the circulating water.
Alternatively, the cooling water quality control method described in 2). 4. The conductivity or pH value of the circulating water and / or the makeup water and the blowdown water amount of the circulating water are measured, and the measured data is transmitted and the control signal of the blowdown water amount control valve is received and controlled. Alternatively, the water quality control method for cooling water according to any one of 2 and 3 above. 5. A terminal communication base is used for measuring the conductivity or pH value of circulating water and makeup water, and a communication circuit is provided between this terminal communication base and a remote communication control fixed base and / or mobile communication control base. The two-way communication in which the water quality control data is transmitted and output from the terminal communication base to the fixed and / or mobile communication base, and the control signal of the terminal water quality control device is transmitted and output from the fixed and / or mobile communication base to the terminal communication base. A cooling water quality control method characterized by constructing a system and controlling the cooling water quality from a remote location.