JP2005351549A - Cooling tower maintenance control system - Google Patents

Abstract

[PROBLEMS] To prevent heat exchanger scale and slime adhesion in circulating water cooling water system between cooling tower having heat exchanger and large-scale air-conditioning / industrial cooling equipment, and prevent rust prevention of piping in the water system. Provided is a cooling tower maintenance control system that performs without using the
Means for causing cooling water circulating through a cooling facility and a cooling tower to flow into an ionization electrolytic cell and automatically operating to maintain its pH value to prevent slime adhesion and prevent rust, and electrodes It is characterized in that it is equipped with a control system that eliminates the need for forced blow for concentration prevention and the use of chemicals by suppressing the slime and algae by descaling using electrolysis and electrosterilization.
[Selection] Figure 1

Description

  The present invention relates to a system for maintaining a cooling tower in a cooling water system of circulating water between at least a cooling tower having a heat exchanger and an air conditioning / industrial cooling facility. Specifically, the open water, which is the circulating water passing through the heat exchanger of the cooling tower, is electrolyzed to maintain a constant pH value, thereby preventing the scale adhesion of the heat exchanger of the cooling tower and the rust prevention of the cooling water pipeline. It relates to the technology to be performed.

  Conventionally, in the water treatment of the circulating water system of the circulating water of at least the cooling tower having the heat exchanger, failures due to the circulating water such as corrosion, generation of slime, and scale adhesion have occurred. These obstacles include various factors such as increased pump power, reduced heat exchanger coefficient of heat exchanger, blockage of pipes, corrosion of pipes and equipment, faults due to leakage of circulating water, sludge settling inside equipment, etc. This may cause trouble.

In order to prevent these obstacles, water treatment chemicals such as rust inhibitors, sludge dispersants, slime generation inhibitors, bactericides, and scale inhibitors have been used for circulating cooling water. However, there is a problem that it is difficult to manage the addition of an appropriate amount of chemicals to the circulating water. Patent Document 1 discloses a method of adding a special water treatment chemical and managing the required amount of the water treatment chemical based on the measured concentration value.
However, even if the concentration is measured, the amount of cooling water replenished varies greatly from day to day due to climate change, and it has been difficult to replenish appropriately following the change. Also, a large amount of makeup water has been consumed in order to dilute the concentrated cooling water to a low concentration.

  Moreover, since the injection chemical | medical agent for water treatment is maintained at the density | concentration used as high calcium hardness, there existed a problem that scale adhesion occurred easily. For this reason, the cooling tower main body and the periphery thereof are fouled by scale components such as calcium, and the adhering of these causes clogging of the filler and the like, and cleaning for removal is necessary. As described above, in the use of chemicals, there is a problem that the labor of the injection management and the cost of chemicals to be added are required. Furthermore, the waste water of cooling water to which chemicals have been added has caused problems such as discharge of harmful substances and eutrophication with nitrogen and phosphorus.

  Further, in Patent Document 2, as a measure for preventing rusting of pipelines, decay of circulating water, and dirt, carbon fine powder is deposited by electrolysis using a carbon electrode as a positive electrode, and suspended in circulating water. A method for preventing corrosion of pipelines and generation of bacteria, scales and algae in the liquid by using dispersed carbon powder is disclosed. However, there is a problem that it takes time and effort to mix this suspension with circulating water and transportation costs.

  In addition, Patent Document 3 proposed by the present inventors discloses a method and an apparatus for rust prevention, scale prevention, and sterilization by adding alkaline ionized water prepared by electrolysis to circulating water. . However, since the alkaline ionized water to be used is purchased and used at the factory, it costs as much as chemicals, and the alkali in the tank of the injection device provided on the rooftop, etc. near the cooling tower. The remaining amount of ionic water has to be managed and replenished, and the transportation of alkaline ionized water also involves labor and cost.

  Such a problem of replenishment of alkaline ionized water is a larger problem in a large cooling tower. That is, in the large cooling tower, the amount of evaporation is large, and the injection of alkaline ion water is also large. For this reason, although the improvement effect of the circulating water by alkali ion water can be expected, the method using the alkali ion water manufactured in the factory had a problem that it was difficult to implement.

  Further, in Patent Document 3, it is proposed that a belt-type electrode for scale adsorption or a fixed electrode is provided in the cooling tower, but the belt-type electrode in the cooling tower causes a scale component to adhere in water, Although it was intended to mechanically remove the adhesion scale out of the system by rotating it, it was exposed to the splash of circulating water, so it was necessary to use an expensive member, and there was a problem that the device became large . On the other hand, the stationary submersible electrode does not require a drive unit, but it must be taken out of the cooling tower in order to periodically remove the attached scale, and it takes time to stop the operation and remove the attached scale. There was such a problem. In addition, the stationary water fixed electrode has a problem that the adhering matter is peeled off in water and the circulating water is contaminated.

  Forcibly removing scale components with an electrode is effective in preventing disturbance of concentration of circulating water due to scale components, and also sterilization, growth inhibition, and algal germination / growth inhibition due to current flowing through the electrode tube Although effective and desirable, there has been a problem that a method for removing the scale attached to the electrode while the operation is continued has not been established.

JP 2000-354856 A (2nd, 3rd page, FIG. 1) Japanese Patent Laid-Open No. 7-159082 (pages 2, 3 and 1) Japanese Patent Application No. 2003-016886 (2nd, 3rd page, FIG. 1)

  The present invention has been made in view of the above-mentioned problems, and the problem to be solved is a large-scale industrial or air-conditioning system equipped with a cooling system for circulating water to a cooling tower having a heat exchanger. It is a cooling tower maintenance control system for preventing the adhesion of a scale that easily adheres to the heat exchanger in a cooling facility, and preventing rust and corrosion in the piping line of the cooling water system.

In order to solve the above problems, the cooling tower maintenance control system of the present invention is characterized in that slime generation of the heat exchanger in an air-conditioning / industrial cooling facility having a cooling water system of circulating water to at least a cooling tower having a heat exchanger. A cooling tower maintenance control system that prevents scale adhesion and rust prevention of the cooling water system pipe line,
The control system includes a circulating water inflow pipe that allows circulating water to be cooled from the upper side of the heat exchanger of the cooling tower, a cooling water reservoir that descends the heat exchanger and receives the cooled circulating water, and the reservoir Cooling water suction pipe and pump for sucking cooling water from, a circulating water recovery pipe for returning the cooling water to the facility, and a faucet that opens when the water level of the water storage tank falls below an allowable range, opens the faucet to supply makeup water. It has a ball tap (BT) mechanism and a makeup water pipe that automatically flow into the water tank,
Further, the makeup water pipe is connected to a water meter, a pulse generator that outputs a pulse signal every time the quantity of makeup water increases by a unit cubic meter, and a circulating water recovery pipe or a makeup water pipe to take cooling water into the electrolytic cell. A first branch pipe, a second branch pipe for connecting the ionic water treated in the electrolytic tank to a cooling water circulation pipe or a makeup water pipe, an electrolytic tank for generating ionic water having a set pH value, and the electrolytic tank A computer control device that controls and operates when the makeup water flows in; an inlet pipe portion of an electrolytic cell that flows into the electrolytic cell via the first branch pipe; and ionic water generated in the electrolytic cell. Control of the computer control unit to the outlet pipe part to be circulated to the two branch pipes and the circulating water intake pipe / ionic water delivery pipe between the inlet / outlet pipe parts and the first and second branches. By signal Comprising an electronic valve that is closed, further, at least comprising a pH meter on the ion water delivery pipe,
When the computer control device reads the pulse signal from the pulse generator connected to the input terminal of the device from the input terminal via the interface, the computer control device is connected to the output terminal of the control device. An electronic valve opening means for outputting an open signal to each of the two electronic valves is provided, a part of the cooling water is taken into the electrolytic cell from the first branch pipe, and the generated ion water is sent out from the second branch pipe. ,
In addition, after an open signal is output to the electronic valve, data for outputting a predetermined voltage value is input to the control of the connected electronically controlled DC power supply via the interface, and output to the DC power supply output terminal It is equipped with a direct current application means to be applied, and is operated by applying a predetermined direct current voltage to both electrodes for generating ionic water of the electrolytic cell connected to the output terminal,
During operation of the electrolytic cell, pH value data from the pH meter of the ion water delivery pipe connected to the input terminal is read from the input terminal via the interface or A / D converter and stored in the work memory. An automatic pH value maintaining means for comparing the voltage value with a predetermined pH value and adjusting the voltage value so as to match is provided.

The control system includes a bypass branch pipe between the circulating water intake pipe / ion water delivery pipe and each of the first and second branch pipes, and between the two bypass branch pipes. Is connected with a bypass pipe and a water amount adjustment valve, and a water amount sensor is provided on the ion water delivery pipe.
Before the computer control device operates the electrolytic cell, the amount of water flowing into the electrolytic cell in advance when the electronic valve opening means is executed can be adjusted to a predetermined amount by the water sensor.

The control system includes a bypass branch pipe between the circulating water intake pipe / ion water delivery pipe and each of the first and second branch pipes, and between the two bypass branch pipes. Is connected with a bypass pipe and a water amount adjustment valve, and a water amount sensor is provided on the ion water delivery pipe.
The computer control device further includes a control terminal of the water amount adjusting valve that is simultaneously connected via an interface when a part of the circulating water is taken in from the first branch pipe by the electronic valve opening means. And adjusting valve moving means for outputting command data encoding the rotation direction and angle of the valve from the output terminal of the device,
A means for reading the amount of water flowing into the electrolytic cell, reading the signal from the water amount sensor from the input terminal connected to the water amount sensor to the working memory via the interface;
Comparing the amount of water treated by a predetermined electrolyzer and the amount of water of the water amount sensor on the working memory, the water amount adjusting means for repeating the change of the command data by the adjusting valve moving means so as to match, To do.

In addition, the electrolytic cell maintains a predetermined distance between a negative rod-shaped electrode, a cylindrical ion-exchange membrane aligned with the central axis, and an electric field solution permeable or mesh-shaped positive cylindrical electrode outside the negative electrode. And the electric field solution fills the outside of the diaphragm,
The inlet pipe part is connected to the lower part of the cylindrical ion exchange diaphragm, the outlet pipe part is connected to the upper part of the diaphragm, and a sludge discharge pipe is branched to the lower part of the diaphragm, A gas vent pipe for separating the gas is provided on the upper portion of the diaphragm.

  Further, the cylindrical ion exchange diaphragm is formed by forming a flat plate shape obtained by kneading a heated or water-soluble polymer material into a granular or crushed ceramic and extrusion-molding it onto a reinforcing cloth-like fiber. A ceramic-mixed resin binder diaphragm separated from a nearly equal cylindrical mold material, or a water-soluble polymer material heated to granular or crushed ceramic is kneaded, molded into a cylindrical mold, and then dried. It is a ceramic mixed resin binder layer diaphragm.

The control system further includes a fifth branch pipe provided on the cooling water recovery pipe connected to the first branch pipe, a sixth branch pipe provided on the treated water inflow pipe, and ion water electrolysis. Applying a DC electric field of different polarity alternately to the two electrodes facing each other in the liquid, attaching the scale to the negative electrode, collecting it, and then removing it by removing it, and the treated water to the scale removing device An inflow pipe for flowing in from the fifth branch pipe, an outflow pipe for discharging treated water from which scale has been removed to the sixth branch pipe, and an electronic valve provided in the inflow pipe and the outflow pipe,
The computer control device further includes a scale processing electronic valve opening means for outputting an open signal from its output terminal to the inflow / outflow pipe electronic valve connected at a preset time or during operation of the electrolyzer. Comprising treated water into the scale removing device,
In addition, a predetermined voltage value and data whose polarity is changed every predetermined time are input to the DC voltage control terminal via the interface, and the voltage is applied to the two electrodes connected to the DC power supply output terminal. And a predetermined voltage pattern applying means for outputting a value.

  The scale removing device has a structure in which two strip-shaped metal electrodes having a predetermined width are wound in a “spiral shape”, and the front and rear surfaces of the two metal electrodes are spaced from the counter electrode by a predetermined distance. It is characterized by being held by.

  In addition, the scale removing device has a structure in which a plurality of rectangular metal plates having a predetermined area are held at predetermined intervals, and every other metal plate is connected to form two electrodes. To do.

Further, in the central region of the upper cover of the cooling tower, a DC removing electric field having different polarities is alternately applied to the two electrodes, and a scale removing device for removing the scale by attaching the scales to these electrodes is disposed.
The treated water from the treated water inflow pipe flows into and out of the heat exchanger and also flows into the scale removing device, and the treated effluent water is discharged to the cooling tower lower cooling water receiving portion and cooled through the heat exchanger. It is characterized in that it is collected in a cooling water collecting pipe by a pump together with water and sent to a cooling facility.

  The cooling tower maintenance control system of the present invention operates an electrolytic cell that automatically generates alkaline ionized water and ionizes circulating water to the cooling tower every time a predetermined amount of makeup water flows in. Slime adhesion prevention of the heat exchanger and rust prevention / preservation in the cooling water pipe can be effectively performed simultaneously.

  In addition, since ionic water is automatically generated by the system, it is not necessary to carry out work such as transportation and injection of ionic water, which is economical overall. Furthermore, by exposing the circulating water between the electrodes of the electrolytic cell and the scale prevention device, killing, sterilization and generation of fungi such as Legionella bacteria and algae (slime) in contact with the anode (+) electrode are suppressed. . For this reason, the injection | pouring apparatus and injection | pouring operation | work of the chemical | medical agent for sterilization conventionally thrown into circulating water become unnecessary.

  At the same time, the circulating water to the cooling tower automatically flows into the scale remover for a predetermined time or while the electrolytic cell is in operation, and the polarity of the DC electric field to the two electrodes is changed at regular intervals, and the scales adhere to each electrode. Since the removal of the scale is repeated, the scale removal operation is automated, and the time required for manual operation can be greatly reduced. These can have a great effect in combination with the above-described automation of makeup water.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of the cooling tower maintenance control system of the present invention. Reference numeral 1 denotes a cooling tower maintenance control system, and 10 is called a cooling tower or a cooling tower, and cools the circulating water of the cooling facility 20. 11 is a hollow cylindrical heat exchanger in the cooling tower 10. There is a treated water inflow ring portion 11a at the top. In this example, a large number of metal rods having high thermal conductivity are arranged with a predetermined gap in the vertical direction, and are cooled while water drops from the annular portion 11a through the gap. A mesh metal plate or the like may be arranged instead of the metal bar.

  12 is a cooling tower upper side cover such as the heat exchanger 11, 12a is a treated water inflow pipe from the cooling facility 20 provided to flow into the treated water inflow ring part 11a, and 12b is a heat exchanger. 11 is an air inflow portion provided with a gap so that air for cooling metal such as 11 metal rods can flow in.

  13 is a cooling water receiving part (water storage tank) on the lower side of the cooling tower that stores water cooled by passing through the heat exchanger 11, and 13a will describe cooling water of the cooling water receiving part 13 (water storage tank) later. This is a cooling water recovery pipe that is sucked up by the pump 19 and recovered to the cooling facility 20.

  Reference numeral 14 denotes a high-temperature air or steam discharge fan device that sucks ambient air heated by the heat exchanger 11 heated by the heat of the inflowing water by rotating the fan with a motor and discharges it to the outside.

  The broken line arrows in FIG. 1 indicate the convection flow of air by the fan device 14, and the solid line arrows indicate the direction in which the water flow of the circulating water descends.

  Reference numeral 15 denotes a ball tap (BT) mechanism, and a faucet 15b descending according to the water level opens the faucet below the predetermined water level, and makeup water flows into the cooling water receiver 13 from the makeup water pipe 15a.

Reference numeral 16 denotes a water meter that measures the amount of replenishing water when replenishing the amount of circulating water that has evaporated and decreased and the water level has decreased. Further, the water meter 16 is provided with a pulse signal generator for generating a pulse signal every time the amount is increased by 1 m ³ and its output terminal 16a.

  Reference numeral 19 denotes a circulating water pump, the suction pipe 19a sucks cooling water from the cooling water recovery pipe 13a, and the discharge pipe 19b sends the cooling water to the cooling water recovery pipe 13a on the cooling facility 20 side.

  Reference numerals 21 and 22 respectively denote a first branch pipe (circulated water intake branch pipe) and a second branch pipe (ion water delivery branch pipe) provided in connection with the discharge pipe 19b before and after the pump 19 and the suction pipe 19a. It is.

  Reference numeral 40 denotes an electrolytic cell, 40a denotes an upper lid, and 40b denotes an electrolytic solution. The electrolytic cell 40 is a circulating water alkaline ionizer between the cooling facility 20 and the cooling tower 10.

  The electrolytic cell 40 is provided with a central rod electrode (negative electrode) 43 so as to hold a predetermined gap along the cylindrical central axis of the cylindrical ion exchange diaphragm 44, and to hold a predetermined gap outside the diaphragm 44. A cylindrical electrode (positive electrode) 45 is provided.

  The cylindrical diaphragm 44 is formed by mixing a superheated water-soluble polymer material with granular or crushed ceramic and extruding it onto a reinforcing cloth-like fiber so that the diameter of the cylindrical pipe is approximately the same. It is a ceramic-mixed resin binder layer membrane that has been spread on an equal cylindrical mold and dried.

  The feature of this manufacturing method is that the diaphragm has a cylindrical shape that is long in the axial direction and that can respond to external forces such as water pressure in the radial direction perpendicular to the central axis by the reinforcing cloth-like fibers. The manufacturing method of the cylindrical diaphragm 44 may be a ceramic-mixed resin binder layer diaphragm in which a heated or water-soluble polymer material is kneaded into granular or crushed ceramic, poured into a cylindrical mold, molded, and dried.

  The lower side portion of the cylindrical portion of the diaphragm 44 is connected to the inlet pipe portion 44a. The inlet pipe portion 44a is connected to the circulating water intake pipe 41 and passes through the electrolytic cell upper lid 40a to the first branch pipe 21. Connecting.

  On the other hand, the upper part of the cylindrical part of the diaphragm 44 is connected to the outlet pipe part 44b through the electrolytic cell upper lid 40a, and the outlet pipe part 44b is connected to the ionic water delivery pipe 42 and further connected to the second branch pipe 22. To do. The outlet pipe portion 44b is provided with a gas vent pipe 44c.

  Furthermore, between the 1st branch pipe 21 and the circulating water intake pipe 41, the 3rd branch pipe 23 and the electronic valve 41a opened and closed by electronic control are provided.

  On the other hand, at least a fourth branch pipe 24, an electronic valve 42a, a water amount sensor 42b, and a pH meter 42c are provided between the second branch pipe 22 and the ionic water delivery pipe 42.

  44d is a sludge discharge pipe, and 44e is a discharge valve for discharging sludge.

  Between the third branch pipe 23 and the fourth branch pipe 24, a bypass pipe 25 and a water amount adjusting valve which receives a signal for controlling an arbitrary rotation angle and direction and rotates the valve in a specified opening degree and direction. 25a is provided.

  The computer control device 50 shown in FIG. 2 is a control device that automatically prevents the scale from adhering to the heat exchanger 11 in the cooling tower 10 of the system 1 and prevents the cooling water system pipe line from rusting with the cooling equipment 20. is there.

  Here, the computer control device 50 controls the outside by the storage device 50l, the input device 50m, the display device 50n, the input terminal portions 50h, i, j for reading data signals from the outside via the interface portion I / F. Output terminal units 50p, q, r for outputting signals, an electronic control DC power source 30 for outputting a DC voltage as a voltage value of an arbitrary polarity from the 50x, 50y terminals via the interface unit I / F, and the internal bus And a computer processing unit CPU controlled by.

  Next, operation | movement of the cooling tower maintenance control system 1 of 1st Example is demonstrated.

  (A) Immediately after the CPU reset of the computer control device 50, a close signal is sent to the electronic valves 41a and 42a from the terminals 50p and 50q so that the valves are closed. Further, the water amount adjusting valve 25a is in a closed state by rotating the valve so that the water amount becomes zero. On the other hand, the input terminals 50h, i, j are set to read the pulse signal from the output terminal 16a of the pulse signal generator of the water meter 16, the data signal from the water amount sensor 42b, and the data signal from the pH meter 42c, respectively. Further, the electronic control DC power supply 30 is always in a state of outputting a predetermined DC voltage and polarity from the output terminals 50x and 50y. (initial state)

(B) In the above initial state, when the circulating water gradually decreases, the cooling water in the cooling water receiver 13 decreases, the water level decreases, the float 15b descends, the faucet opens, and makeup water flows in. Each time the amount of water increases by 1 m ³ from the 16 pulse signal generator output terminals 16a, a pulse signal is output.

  The CPU of the computer control device 50 reads the pulse signal input from the connected input terminal 50h from the bus to the working memory via the I / F.

  Next, when the pulse signal of the transmitter of the water meter 16 is input, the CPU sends an open signal from the bus to the electronic valves 41a and 42a connected to the output terminals 50p and 50q via the I / F. (Electronic valve opening means)

  With the above electronic valve opening means, a part of the drained water of the pump 19 is taken into the electrolytic cell 40 from the first branch pipe 21, while the ionic water generated in the electrolytic tank 40 is pumped from the second branch pipe 22 to the pump 19. Inhale.

  (C) Next, the CPU outputs a predetermined voltage value and polarity to the control unit of the electronic control DC power supply 30 via the I / F immediately after the open signal is output to the electronic valves 41a and 42a. Data to be input is input and output to the output terminals 50x and 50y of the electronic control DC power source. (DC application means)

  By the above DC applying means, a predetermined DC voltage is applied to the negative and positive electrodes 43 and 45 for generating ionic water of the electrolytic cell 40 connected to the output terminals 50x and 50y, thereby bringing the electrolytic cell 40 into an operating state. .

  (D) Next, the CPU operates from the pH value data output terminal of the pH meter 42c on the ionic water delivery pipe 42 connected to the outlet pipe portion 44b connected to the input terminal 50i during the above-described electrolytic cell operation state. Then, the pH value is connected to the input terminal 50i via the I / F or AD converter or the like and is read into the working memory, the pH value set as the target value is compared with the current pH value, and it is repeated until they match. . If the increase rate per unit time of the pH value is lower than a predetermined value by repeating until they coincide, the electrolytic cell is operated by increasing the DC voltage value by the DC applying means. If they match, adjustment is made to return to the initial voltage value, and the above procedure is repeated. (Automatic pH value maintenance means)

  While the replenishing water is being replenished to the circulating water sequentially by each of the above means, the generated ionic water flows into the circulating water, preventing the scale from adhering to the heat exchanger and preventing the cooling water system pipe line from being rusted. Will be made.

  Here, if the water level of the cooling water receiving part 13 returns to the original normal water level, the faucet is closed and no pulse signal is output from the pulse signal generator output terminal 16a.

  If there is no pulse signal input signal for a certain time or more, the CPU automatically resets, returns the electronic valves 41a and 42a to the initial initial state, the applied voltage to the electrolytic cell 40 becomes zero, and the electrolytic cell 40 is in a resting state. It becomes. That is, a closed signal is issued to the electronic valves 41a and 42a, and the circulating water channel system to the electrolytic cell 40 and the cooling facility 20 is completely separated by closing the valves.

  In the initial initial state (a), the electronic valves 41a and 42a are opened according to the procedure of the electronic valve opening means by the pulse signal from the water meter 16, and a part of the cooling water flows from the branch pipe 21. When the amount of water is larger than necessary (for example, when the scale of the cooling facility 20 is large), the efficiency of the electrolytic cell 40 decreases, so the water amount adjustment valve 25a provided in the bypass pipe 25 is gradually rotated from the closed state to the opening direction. Then, the flow of the bypass return water is caused to flow to the bypass pipe 25, and the optimum water flow is adjusted to the necessary minimum while watching the water amount sensor 42b while reducing the inflow to the circulating water intake pipe 41 of the electrolytic cell 40.

  The environmental setting of the amount of flowing water to the electrolytic cell 40 in the initial state may be automatically adjusted using the computer controller 50 as shown below.

  (A) First, when a part of the circulating water is taken in from the first branch pipe 21 by the electronic valve opening means, the CPU simultaneously controls the water amount on the bypass pipe 25 connected via the I / F. Command data in which the rotation direction and angle of the valve are encoded is output from the output terminal of the computer control device 50 to the control terminal 25a via the I / F. (Control valve moving means)

  (B) On the other hand, the CPU receives the water amount data signal of the water amount sensor 42b on the ion water delivery pipe 42 at the input terminal 50j and reads it into the work memory of the CPU via the I / F. (How to read the amount of water flowing into the electrolytic cell)

  (C) The adjustment command data is sent to the control terminal of the water amount adjusting valve 25a so that the effective minimum required amount of treated water determined in advance in the working memory is equal to or less than the read current water amount. Then, the adjustment of the valve 25a is repeated so that the predetermined amount of water is obtained. (Water volume adjustment means)

  As described above, if the means (a), (b), and (c) are used instead of the electronic valve opening means (b) described above, the electrolytic cell 40 is automatically operated with the optimum water amount. Can do.

  Thereafter, the means in (c) and (d) described above may be executed sequentially.

  FIG. 3 is a block diagram showing the second embodiment. In this embodiment, a supplementary water pipe 17 connected to a circulating water intake pipe 41 from a first branch pipe (a supplementary water intake branch pipe) 21a provided in the supplementary water pipe 15a and an ion water supply pipe 42 are connected to the lower side of the cooling tower. An ionic water supply pipe 18 that opens to the cooling water receiving portion 13 is provided.

  In the first embodiment, the cooling water is poured into the electrolytic cell 40 from the cooling water recovery pipe 13a for reforming. However, in this second embodiment, a part of the replenishing water is poured into the electrolytic cell 40 in advance. This is an embodiment in which replenishment is performed after quality.

  This embodiment is suitable when there are a lot of scale components in the make-up water, and when the heat load on the cooling tower is large and the cooling water is concentrated at high speed. By doing so, the effect which suppresses scale concentration is exhibited.

  When the water level of the cooling water receiver 13 is lowered, the ball tap mechanism 15 is activated, and makeup water is supplied, the computer control device 50 outputs the output terminal 50p according to the signal of the pulse generator 16a of the water meter 16 that detects the water flow. An open signal is sent to the electronic valves 41a and 42a connected to 50q, and a part of the makeup water is supplied from the first branch pipe (makeup water intake branch pipe) 21a through the make-up water pipe 17 and the circulating water intake pipe 41. Is supplied to the electrolytic bath 40, and the ionic water generated in the electrolytic bath 40 is supplied to the cooling water receiving unit 13 through the ionic water supply pipe 18.

  Note that the numbers with the same reference numerals as those in FIG. Further, the operation control of other electrolytic cells is performed in the same manner as in the first embodiment.

  FIG. 4 is a diagram showing the configuration of the cooling tower maintenance control system 2 according to the third embodiment of the present invention. Here, the same reference numerals as those in FIG. 1 denote the same functions, and the description thereof is omitted.

  In FIG. 4, 60 is a scale removing device for removing the scale of water circulating between the cooling equipment 20 and the cooling tower. The scale removing device 60 is provided with two electrodes that can be applied with positive and negative opposite to each other in treated water whose scale is to be removed, and a DC voltage is applied to the two electrodes to attach the scale to the electrodes. This scale removing device changes the polarity of the voltage to be applied every predetermined time so that the scale attached to the electrode peels off. Therefore, the two electrodes are structured to face each other with as wide an area as possible.

  The terminals of the two electrodes are indicated by 60x and 60y. These terminals are connected to output terminals 50z and 50w of the electronic control DC power supply 30.

  Reference numeral 27 denotes a fifth branch pipe, and 28 denotes a sixth branch pipe, which are connected to an inflow pipe 61 and an outflow pipe 62 to the scale removing device 60, respectively, and are provided with electronic valves 61a and 62a, respectively. An electronic valve 60a for discharging the scale is provided on the lower side of the scale removing device 60.

  The electronic valves 60a, 61a, and 62a are connected to and controlled by the output terminals 50u, 50s, and 50t of the computer control device 50, respectively.

  70 is a sedimentation tank for the scale, and the scale accumulated in the inlet pipe portion 44a of the electrolytic cell 40 is collected by opening the discharge valve 44e, and the scale is discharged by opening the discharge valve 60a of the scale removing device 60. The collected scale is collected and the scale is precipitated. The figure shows a typical structure.

  Next, the operation of the cooling tower maintenance control system 2 of the second embodiment will be described.

  Immediately after the CPU reset of the computer control device 50, in addition to the initial state (a) of the control system 1 of FIG. 1, the electronic valves 61a and 62a are further connected to the output terminals 50s and 50t of the computer control device 50, and the CPU Is closed by sending a close signal from the output terminals 50s, 50t to the electronic valves 61a, 62a via the I / F. The discharge valve 60a is also closed.

  Here, the control system 3 of FIG. 4 is similar to the control system 1 of FIG. 1 in the state where makeup water is being replenished, the electronic valve opening means (b), the direct current application means (c), and the automatic pH. The value maintaining means (d) is at least executed.

  In the control system 3 of the third embodiment, in addition to the means (b), (c), and (d), the following means executes the treatment of circulating water.

  (E) The CPU of the computer control device 50 has electronic valves 61a, 62a provided in the inflow / outflow tubes 61, 62 during the time when the scale removing device 60 is operated in advance or during the time when the electrolytic cell 40 is operated. An open signal is sent from the output terminals 50s and 50t of the apparatus 50 through the I / F. (Scale processing electronic valve opening means)

  By this means (e), the treated water is introduced into the scale removing device 60 from the fifth branch pipe 27 and the water is recovered from the sixth branch pipe 28.

  (F) The CPU sends a data command signal to the control unit of the electronic control DC power source 30 controlled by the device 50 via the I / F. The data command signal sends data encoding a predetermined DC applied voltage value and a repetition time for changing the polarity to the control unit, and the DC voltage value of the data from the output terminals 50z and 50w of the electronic control DC power supply 30. And repeat output of polarity.

  This output is applied to the two-electrode terminals 60x and 60y of the connected scale removing device 60. (Predetermined voltage pattern application means)

  By this means (f), the scale of the treated water flowing into the scale removing device 60 adheres to the electrode and is separated and precipitated.

  Here, when the operation of the electrolytic cell 40 is suspended or when a predetermined time is exceeded, the CPU performs electronic control direct current via the I / F so as to stop the voltage applied to the scale removing device 60. A command signal is sent to the control part of the power supply 30, and the application to the output terminals 50z and 50w is made zero. At the same time, the CPU sends a closing signal from the output terminals 50s and 50t to the electronic valves 61a and 62a connected thereto via the I / F.

  By resetting the scale removing device 60 as described above, the circulating water between the cooling facility 20 and the cooling tower 10 is separated.

  Here, the valve | bulb of the discharge valve 60a is opened and the operation | work which moves a scale etc. to the sedimentation tank 70 is performed.

  Next, the detailed structure of the two electrode portions of the scale removing device 60 is shown in FIGS. As described above, the two electrodes have a structure that is as wide as possible and maintains a predetermined gap and faces each other.

  5A and 5B are diagrams showing the structure of a cyclone electrode type scale removing device, where FIG. 5A is a top view and FIG. 5B is a side view. The scale removing device 60 shown in FIG. 5 has a structure in which the AB electrodes are confronted with each other in a spiral shape when the two electrodes are an A electrode and a B electrode, respectively.

  The water to be treated that flows in from the inflow pipe 61 of the scale removing device 60 flows in from the side surface of the main body, rotates in a spiral shape, attaches the scale to the electrode surface between the applied AB electrodes, and the scale is removed. Water is discharged from the upper outlet pipe 62. The scale peeled off from the electrode descends downward and accumulates.

  6A and 6B are diagrams showing the structure of a multi-layer planar scale removing device, where FIG. 6A is a top view, FIG. 6B is a side view, and FIG. 6C is a sectional view taken along line XX in FIG. The scale removing device 60 shown in FIG. 6 has a multilayer planar structure in which the alternately arranged A electrode groups and B electrode groups are connected to form two electrodes.

  In this case, each electrode has a structure that can be taken out for easy repair / maintenance, and a rectifying punching plate P is provided at the inlet and outlet so that the inflow water flows on average between the electrodes. However, the punching plate P is only the inlet, and the overflow side is provided with an overflow prevention trap Q so that the water flow is lowered and the scale is also lowered.

  Further, in order to make it possible to easily remove the scale between the straightening punching plate P and the inlet / outlet pipe, the scale takeout movable plate 60b is provided on the lower side.

  If the scale removal apparatus shown in FIGS. 5 and 6 is used, the treatment water can be flowed between the electrodes having a large area so as to be adapted to a large-scale cooling facility, and the treatment efficiency per unit time can be improved.

  7A and 7B are explanatory views of the unit-assembled scale removing device, where FIG. 7A is a sectional view of the unit, FIG. 7B is a perspective view of three unit assemblies, and FIG. 7C is an explanatory view of voltage application to the center electrode.

  As shown in FIG. 7A, the scale removing unit is provided with electrodes 60y facing both sides so as to sandwich the center electrode 60x, and has a structure in which the scale is easily attached to the center electrode 60x efficiently. By using the scale removing device as a unit, when the cooling facility 20 is large, the unit can be provided in n rows in parallel so that the processing capacity can be made appropriate.

  FIG. 7B is a view showing an embodiment in which scale removal units are assembled in parallel in three rows. Here, the inflow pipe 61 and the outflow pipe 62 are arranged together as one total inflow pipe and total outflow pipe, respectively.

  As shown in FIG. 7C, a negative voltage is applied to the center electrode 60x, the scale is adsorbed and adhered, the polarity is reversed at regular intervals, and the electrodes 60y on both sides are set as the negative electrodes, and the center electrode 60x. A positive voltage is applied to the scale, and the scale attached is peeled off and dropped to recover efficiently.

  FIG. 8 is a diagram showing the structure of a cooling tower with a built-in scale removal device. 1 and FIG. 4 have the same functions, and therefore description thereof is omitted, and the operation of the cooling tower 10 with a built-in scale removal apparatus will be described.

  The treated water that has flowed in from the treated water inflow pipe 12a flows into the heat exchanger 11, and also flows into the apparatus 60 from the inflow pipe 61 of the scale removing device 60 disposed in the central gap.

  The treated water is discharged from the outflow pipe 62 to the cooling tower lower side cooling water receiving unit 13. A direct current voltage is applied to the terminals 60x and 60y of the electrode AB. The application of the DC voltage is alternately switched in polarity as described with reference to FIG. 7C by the computer control device 50, and the scale is removed and recovered. In addition, although the example which made the connection wiring to an electrode parallel was shown in the figure, the electrode of both ends may be connected to the terminal of DC power supply, and the several adjacent electrode between them may be connected in series.

  The collected scale is discharged by opening the on-off valve 60a. Note that any of the embodiments shown in FIGS. 5 and 6 may be applied to the configurations of the electrodes A and B. In the embodiment of FIG. 8, the treated water that has flowed from the treated water inflow pipe 12 a is caused to flow from the inflow pipe 61 to the device 60. Therefore, it is possible to adopt a method that can remove the scale regardless of circulation / stop of the circulating water (not shown).

It is a figure which shows the structure of the cooling tower maintenance control system 1 of the 1st Example of this invention. It is a figure which shows the structure of the computer control apparatus 50 of this invention. It is a figure which shows the structure of the cooling tower maintenance control system 2 of the 2nd Example of this invention. It is a figure which shows the structure of the cooling tower maintenance control system 3 of the 3rd Example of this invention. It is a figure which shows the structure of the scale removal apparatus of a cyclone electrode type | mold, (a) is a top view, (b) is a side view. It is a figure which shows the structure of a multilayer planar type scale removal apparatus, (a) is a top view, (b) is a side view, (c) is XX sectional drawing of (b). It is explanatory drawing of a unit assembly type scale removal apparatus, (a) is sectional drawing of a unit, (b) is a 3 unit assembly perspective view, (c) is explanatory drawing of the voltage application to a center electrode. It is a figure which shows the structure of a scale removal apparatus built-in type cooling tower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling tower maintenance control system 2 Cooling tower maintenance control system 10 Cooling tower 11 Heat exchanger 11a Treated water inflow ring part 12 Cooling tower upper side cover part 12a Treated water inflow pipe 12b Air inflow part 13 Cooling tower lower side cooling water receiving part 13a Cooling Water recovery pipe 14 High temperature air exhaust fan device 15 Ball tap (BT) mechanism 15a Supply water pipe 16 Water meter 16a Pulse signal generator and its output terminal 17 Supply water pipe 18 Ionized water supply pipe 19 Pump for circulating water 20 Air conditioning / industrial cooling equipment 21 1st branch pipe (Branch water intake branch pipe)
21a First branch pipe (make-up water intake branch pipe)
22 Second branch pipe (ion water discharge branch pipe)
23 Third branch pipe 24 Fourth branch pipe 25 Bypass pipe 25a Water amount adjustment valve 27 Fifth branch pipe 28 Sixth branch pipe 30 Electronically controlled DC power supply 40 Electrolyzer (circulating water alkali ionizer)
40a Upper lid 40b Electrolyte 41 Circulating water intake pipe 41a Electronic valve 42 Ion water delivery pipe 42a Electronic valve 42b Water quantity sensor 42c pH meter 43 Center rod electrode (negative electrode)
44 Cylindrical ion exchange diaphragm 44a Inlet pipe part connected to the diaphragm 44b Outlet pipe part connected to the diaphragm 44c Degassing pipe 44d Sludge discharge pipe 44e Drain valve 45 Cylindrical electrode (positive electrode)
50 Computer control device 50h Input terminal from pulse signal 16a of water meter 16 50p, 50q Output terminal of control terminal to electronic valves 41a, 41b 50x, 50y Output terminal 50z to electrolytic cell center electrode 43, cylindrical electrode 45, 50w Output terminal to scale removing device 60 Scale removing device 60a Discharge valve 60b Scale takeout movable plate 60x, 60y Electrode terminal 61 Inflow pipe 61a Electronic valve 62 Outflow pipe 62a Electronic valve 70 Sedimentation tank

Claims (10)

Cooling tower that prevents slime generation and scale adhesion of the heat exchanger and rust prevention of the piping of the cooling water system in an air conditioning / industrial cooling facility provided with a cooling water system of circulating water to a cooling tower having at least a heat exchanger A maintenance control system,
The control system includes a circulating water inflow pipe that allows circulating water to be cooled from the upper side of the heat exchanger of the cooling tower, a cooling water reservoir that descends the heat exchanger and receives the cooled circulating water, and the reservoir Cooling water suction pipe and pump for sucking cooling water from, circulating water recovery pipe for returning the cooling water to the equipment, and a faucet that lowers when the water level of the water storage tank falls below an allowable range, opens the faucet and supplies makeup water. It has a ball tap (BT) mechanism and a makeup water pipe that automatically flow into the water tank,
Further, the makeup water pipe is connected to a water meter, a pulse generator that outputs a pulse signal every time the quantity of makeup water increases by a unit cubic meter, and a circulating water recovery pipe or a makeup water pipe to take cooling water into the electrolytic cell. A first branch pipe, a second branch pipe for connecting the ionic water treated in the electrolytic tank to a cooling water circulation pipe or a makeup water pipe, an electrolytic tank for generating ionic water having a set pH value, and the electrolytic tank A computer control device that controls and operates when the makeup water flows in; an inlet pipe portion of an electrolytic cell that flows into the electrolytic cell via the first branch pipe; and ionic water generated in the electrolytic cell. Control of the computer control device to the outlet pipe part to be circulated to the two branch pipes, and the circulating water intake pipe / ion water delivery pipe between the inlet / outlet pipe parts and the respective first and second branches By signal Comprising an electronic valve that is closed, further, at least comprising a pH meter on the ion water delivery pipe,
When the computer control device reads the pulse signal from the pulse generator connected to the input terminal of the device from the input terminal via the interface, the computer control device is connected to the output terminal of the control device. An electronic valve opening means for outputting an open signal to each of the two electronic valves is provided. A part of the cooling water is taken into the electrolytic cell from the first branch pipe, and the generated ion water is sent out from the second branch pipe. ,
Also, after an open signal is output to the electronic valve, data for outputting a predetermined voltage value is input to the control of the connected electronically controlled DC power supply via the interface, and output to the DC power supply output terminal It is equipped with a direct current application means to be applied, and is operated by applying a predetermined direct current voltage to both electrodes for generating ionic water of the electrolytic cell connected to the output terminal,
During operation of the electrolytic cell, pH value data from the pH meter of the ion water delivery pipe connected to the input terminal is read from the input terminal via the interface or A / D converter and stored in the work memory. A cooling tower maintenance control system, comprising: an automatic pH value maintenance means for comparing the voltage value with a predetermined pH value and adjusting the voltage value so as to match. The control system includes a bypass branch pipe between the circulating water intake pipe / ion water delivery pipe and each of the first and second branch pipes, and the two bypass branch pipes are interposed between the two bypass branch pipes. Connect a bypass pipe and a water amount adjustment valve, and have a water amount sensor on the ionic water delivery pipe.
The water flow adjustment valve can be adjusted to a predetermined amount of water by a water amount sensor in advance when the electronic valve opening means is executed before the computer control unit operates the electrolyzer. The cooling tower maintenance control system according to 1. The control system includes a bypass branch pipe between the circulating water intake pipe / ion water delivery pipe and each of the first and second branch pipes, and the two bypass branch pipes are interposed between the two bypass branch pipes. Connect a bypass pipe and a water amount adjustment valve, and have a water amount sensor on the ionic water delivery pipe.
The computer control device further includes a control terminal of the water amount adjusting valve that is simultaneously connected via an interface when a part of the circulating water is taken in from the first branch pipe by the electronic valve opening means. And adjusting valve moving means for outputting command data encoding the rotation direction and angle of the valve from the output terminal of the device,
A means for reading the amount of water flowing into the electrolytic cell, reading the signal from the water amount sensor from the input terminal connected to the water amount sensor to the working memory via the interface;
Comparing the amount of water treated by a predetermined electrolyzer and the amount of water of the water amount sensor on the working memory, the water amount adjusting means for repeating the change of the command data by the adjusting valve moving means so as to match, The cooling tower maintenance control system according to claim 1. The electrolytic cell maintains a predetermined distance between a negative rod-shaped electrode, a cylindrical ion-exchange membrane aligned with the central axis thereof, and an electric field solution permeable or mesh-shaped positive cylindrical electrode outside thereof, The electric field solution fills the outside of the diaphragm;
The inlet pipe part is connected to the lower part of the cylindrical ion exchange diaphragm, the outlet pipe part is connected to the upper part of the diaphragm, and a sludge discharge pipe is branched to the lower part of the diaphragm, The cooling tower maintenance control system according to claim 1, wherein a gas vent pipe for separating gas is provided on an upper portion of the diaphragm.   The cylindrical ion-exchange membrane is a flat plate material obtained by kneading a heated or water-soluble polymer material into granular or crushed ceramic and extrusion-molding it on a reinforcing cloth-like fiber, and is approximately equal to the inner diameter of the cylindrical pipe. A ceramic-mixed resin binder diaphragm separated from a cylindrical mold or dried, or a water-soluble polymer material heated to a granular or crushed ceramic is kneaded, poured into a cylindrical mold, and molded and dried. 5. The cooling tower maintenance control system according to claim 4, wherein the cooling tower maintenance control system is a ceramic mixed resin binder layer diaphragm. The control system further includes a fifth branch pipe provided on the cooling water recovery pipe connected to the first branch pipe, a sixth branch pipe provided on the treated water inflow pipe, and an ionic water electrolyte. A scale removing device for alternately applying DC electric fields of different polarities to the two electrodes facing each other, attaching scales to these electrodes, collecting and removing them, and removing treated water to the scale removing device in the fifth An inflow pipe for flowing in from the branch pipe, an outflow pipe for flowing out treated water from which scale has been removed to the sixth branch pipe, and an electronic valve provided in the inflow pipe and the outflow pipe,
The computer control device further includes a scale processing electronic valve opening means for outputting an open signal from its output terminal to the inflow / outflow pipe electronic valve connected at a preset time or during operation of the electrolyzer. Comprising treated water into the scale removing device,
In addition, a predetermined voltage value and data whose polarity is changed every predetermined time are input to the DC voltage control terminal via the interface, and the voltage is applied to the two electrodes connected to the DC power supply output terminal. The cooling tower maintenance control system according to claim 1, further comprising a predetermined voltage pattern application unit that outputs a value.   The scale removing device has a structure in which two strip-shaped metal electrodes having a predetermined width are wound in a “spiral shape”, and the front and rear surfaces of the two metal electrodes are held at a predetermined distance from the counter electrode. The cooling tower maintenance control system according to claim 6, wherein:   The scale removing device has a structure in which a plurality of rectangular metal plates having a predetermined area are held at predetermined intervals, and every other metal plate is connected to form two electrodes. Item 7. The cooling tower maintenance control system according to Item 6.   The scale removing device is provided with an inflow pipe and an outflow pipe as a unit with an electrode structure in which one metal plate electrode of an opposite electrode is disposed between two metal plate electrodes of a predetermined area. The cooling tower maintenance control system according to claim 6, wherein a plurality of units can be added in parallel according to the amount of cooling water. In the central region of the upper cover of the cooling tower, a DC removing electric field having different polarities is alternately applied to the two electrodes, and a scale removing device for removing the scale by attaching the scales to these electrodes is disposed.
The treated water from the treated water inflow pipe flows into and out of the heat exchanger and also flows into the scale removing device, and the treated effluent water is discharged to the cooling tower lower cooling water receiving portion and cooled through the heat exchanger. The cooling tower maintenance control system according to claim 1, wherein the cooling tower maintenance control system according to claim 1, wherein the cooling tower is recovered by a pump together with water and sent to a cooling facility.

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