WO2006027825A1 - 冷却水循環装置、および冷却水循環装置のスケール除去方法 - Google Patents
冷却水循環装置、および冷却水循環装置のスケール除去方法 Download PDFInfo
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- WO2006027825A1 WO2006027825A1 PCT/JP2004/012954 JP2004012954W WO2006027825A1 WO 2006027825 A1 WO2006027825 A1 WO 2006027825A1 JP 2004012954 W JP2004012954 W JP 2004012954W WO 2006027825 A1 WO2006027825 A1 WO 2006027825A1
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- Prior art keywords
- cooling water
- electrodes
- water circulation
- electrolysis
- cooling
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46119—Cleaning the electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4613—Inversing polarity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
Definitions
- the present invention relates to a cooling water circulation device and a scale removal method for the cooling water circulation device.
- Patent Document 1 As a cooling water circulation device that circulates cooling water in a water-cooled device or the like, for example, there is one described in Patent Document 1.
- the warm water is cooled by flowing it through a cooling tower, and is circulated again to the heat exchange.
- insoluble calcium salt adheres to the inner wall of the piping, or algae and microorganisms propagate, resulting in clogging of the piping and a decrease in cooling efficiency.
- insoluble calcium salt adheres to the inner wall of the piping, or algae and microorganisms propagate, resulting in clogging of the piping and a decrease in cooling efficiency.
- the hardness of the cooling water rises due to evaporation of water over time, the scale becomes easy to attach. Therefore, the hardness of the cooling water is constantly monitored, and if the hardness exceeds the specified value, the cooling water in the cooling tower If you replace it, something will be done.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-140858
- the method of replacing the cooling water when the hardness exceeds a specified value has a problem in that water resources are wasted because all the cooling water in the cooling tower must be discarded every time the hardness is replaced.
- the present invention has been made in view of the above circumstances, and an object of the present invention is a cooling water circulation device that can suppress adhesion of microorganisms and scales while considering the environment, and a scale removal method for the cooling water circulation device. It is to provide. Means for solving the problem
- a cooling water circulation device for solving the above problem is provided between the cooling device for cooling the cooling water and the cooling device and the apparatus to be cooled, and circulates the cooling water.
- a cooling water circulation device comprising a cooling water circulation path configured by a flowing water channel to be discharged, wherein the cooling water circulation path includes an electrolytic cell for storing the cooling water, a pair of electrodes installed in the electrolytic cell, A voltage source that applies a voltage between the pair of electrodes, and an electrolyzer that performs an electrolysis treatment of the cooling water stored in the electrolytic cell by applying a voltage between the pair of electrodes. It is characterized by.
- the invention of claim 2 is the cooling water circulation device according to claim 1, wherein the voltage source is provided with a switching device for switching the polarities of the pair of electrodes every predetermined time. It is characterized by.
- the invention of claim 3 is the cooling water circulation device according to claim 1 or claim 2, wherein the cooling water circulation path is provided with a bypass path having both ends communicating with the cooling water circulation path, respectively.
- the electrolyzer is provided on the bypass path.
- the invention of claim 4 is the cooling water circulation device according to any one of claims 1 to 3, wherein the electrolysis device has the cooling water based on a current and a voltage between the pair of electrodes.
- a conductivity monitoring device for calculating the conductivity of rejected water is provided.
- the invention of claim 5 includes a cooling water circulation path configured by a cooling device that cools the cooling water, and a flowing water path that is provided between the cooling device and the device to be cooled and circulates the cooling water.
- a scale removal method for a cooling water circulation device wherein an electrolytic cell for storing the cooling water and a pair of electrodes installed in the electrolytic cell are provided in the cooling water circulation path, and a voltage is applied between the pair of electrodes.
- the invention's effect [0011] According to the invention of claim 1, mineral components such as calcium ions and magnesium ions which are contained in the cooling water and cause scales are deposited as scales on the electrodes during the electrolytic treatment. As a result, minerals can be removed from the cooling water, so that scale adhesion in the circulation path can be reduced.
- the electrolytic treatment produces hypochlorous acid and the like having sterilizing ability in the cooling water. This can prevent the growth of microorganisms. In this way, it is possible to suppress the adhesion of microorganisms and scales in the cooling water circulation path without using a chemical solution with a large environmental load. In addition, since it is possible to minimize the exchange of cooling water in the circulation path, wasteful use of water resources can be suppressed.
- the voltage source is provided with the switching device for switching the polarity between the pair of electrodes.
- the scale deposited on the electrode can be easily peeled off by performing the operation by reversing the polarity of the electrode (application of a reverse voltage). Thereby, maintenance of an electrolysis device can be performed easily.
- the electrolyzer is provided on the bypass path provided in the cooling water circulation path. According to such a configuration, when performing maintenance of the electrolysis apparatus, it is only necessary to stop only the electrolysis apparatus that does not need to stop the entire cooling water circulation apparatus. Thereby, maintenance becomes easy.
- the electrolysis apparatus is provided with a conductivity monitoring device that calculates the conductivity of the cooling water based on the current and voltage between the pair of electrodes. According to such a configuration, the hardness of the cooling water can be monitored based on information obtained from the electrolysis apparatus without providing a conductivity meter separately.
- minerals such as calcium ions and magnesium ions, which are contained in the cooling water and cause scale, are deposited as scales on the electrodes in the electrolysis process.
- a cooling hydraulic power can also remove a mineral part.
- the hardness of the cooling water increases due to evaporation of water over time, the hardness can be reduced by electrolytic treatment.
- adhesion of the scale within the circulation path can be reduced.
- the scale deposited on the electrode can be easily peeled off. As a result, the maintenance of the electrolyzer Can be performed easily. Since the cooling water in the circulation path can be reduced to the minimum necessary, waste of water resources can be suppressed.
- the electrolytic treatment produces hypochlorous acid and the like having sterilizing ability in the cooling water. Thereby, propagation of microorganisms can be prevented. In this way, it is possible to suppress the adhesion of microorganisms and scales in the cooling water circulation path without using a chemical solution with a large environmental load.
- FIG. 1 is a schematic diagram of a cooling water circulation device of the present embodiment.
- FIG. 2 Diagram showing the electrolytic treatment procedure for cooling water using an electrolyzer-1
- A Diagram showing the state of the electrolysis process
- B Shows how scale adheres to the electrode during the electrolysis step
- FIG. 3 shows the electrolytic treatment procedure for cooling water using an electrolyzer
- C Diagram showing how the anode and cathode are replaced in the discharge process and the scale is peeled off.
- D The peeled scale is discharged. Diagram showing the situation
- FIG. 4 Fig. 3 shows the procedure for electrolytic treatment of cooling water using an electrolyzer.
- E Anode A diagram showing how the electrolysis process is carried out with the cathode replaced.
- F The electrode is used in the electrolysis process. Diagram showing how scale adheres
- FIG. 5 shows the procedure for electrolytic treatment of cooling water using an electrolyzer.
- Fig. (G) shows how the anode and cathode are replaced in the discharge process, and the scale is peeled off.
- H The peeled scale is discharged.
- Cooling tower (cooling device)
- Second electrode (electrode) 13 DC power supply (voltage source)
- Controller switching device, conductivity monitoring device
- FIG. 1 shows a schematic diagram of a cooling water circulation device 1 embodying the present invention.
- the cooling water circulation device 1 is for circulating the cooling water W through a heat exchanger 2 (cooled device of the present invention) provided in an air cooling device, a refrigeration device, or the like.
- the cooling water circulation path R1 through which the cooling water circulates (hereinafter sometimes simply referred to as “circulation path Rl") includes the heat exchange ⁇ 2 and the cooling tower 3 and the cooling water W cooled by the cooling tower 3
- Two flow pipes 4 (corresponding to the flow channel of the present invention) on the outward path facing the heat exchange ⁇ 2 and the return water W that has passed through the heat exchange ⁇ 2 returns to the cooling tower 3 ) And connected to form a loop as a whole.
- the cooling tower 3 has a general configuration in which water is cooled by contact with air.
- a circulating pump P1 is installed in the outlet pipe 4 on the outgoing path side, so that the cooling water W cooled by the cooling tower 3 can be pumped to the heat exchanger 2.
- the supply pipe 5 with the valve B for supplying the cooling water W from the outside to the cooling tower 3 is provided. Is provided.
- the cooling water circulation device 1 is provided with a bypass path R2 having both ends connected to the cooling tower 3, and an electrolysis device 10 is provided here.
- the electrolysis apparatus 10 is provided with an electrolysis tank 11 for storing the cooling water W, and a first electrode 12A and a second electrode 12B provided inside the electrolysis tank 11. These electrodes 12 A and 12 B are connected to a DC power source 13 (corresponding to the voltage source of the present invention).
- the electrodes 12A and 12B are not particularly limited as long as they are normally used in electrolyzers. 1S Cooling water such as titanium coated with platinum or carbon. Those which do not cause elution of components into W can be preferably used.
- a controller 14 (corresponding to the switching device and the conductivity monitoring device of the present invention) is connected to the DC power source 13 to control the voltage applied to the electrodes 12A and 12B and the current between the electrodes 12A and 12B. You will be able to monitor the voltage.
- a water supply pipe 15 for supplying the cooling water W from the cooling tower 3 and an outflow pipe 16 for returning the electrolyzed cooling water to the cooling tower 3 are connected.
- the water supply pipe 15, the electrolytic cell 11, and the outflow pipe 16 constitute a binose path R2.
- the water supply pipe 15 is provided with a no-pass pump P2 so that the cooling water W can be pumped to the electrolytic cell 11.
- the outflow pipe 16 is adapted to return the cooling water W overflowed from the electrolytic cell 11 to the cooling tower 3.
- a hopper 17 is provided at the bottom of the electrolytic cell 11, and a discharge pipe 18 with a valve B is provided at the bottom of the hopper 17.
- the cooling water W cooled in the cooling tower 3 is supplied to the heat exchanger 2 through the flowing water pipe 4 to perform heat exchange.
- the cooling water W warmed by the heat exchange is returned to the cooling tower 3 through the flow pipe 4 again, cooled in the cooling tower 3 and sent to the heat exchanger 2.
- the cooling water W cooled by the cooling tower 3 circulates in the cooling water circulation path R1, so that cooling by an air cooling device, a refrigeration device, or the like connected to the heat exchanger 2 is performed.
- Electrolysis is performed by applying a DC voltage (hereinafter referred to as the first electrolysis step, which corresponds to the electrolysis step of the present invention).
- the deposited scale S gradually accumulates on the first electrode 12A on the cathode side. Therefore, after the operation for a predetermined time, the anode-cathode is reversed and the operation is performed (discharge process).
- the binos pump P2 is stopped, and the supply of the cooling water W to the bypass path R2 is interrupted.
- the controller 14 controls the voltage from the DC power source 13 to apply a DC voltage between the electrodes 12A and 12B with the first electrode 12A as an anode and the second electrode 12B as a cathode.
- the scale S is deposited on the first electrode 12 A in the first electrolysis step, and is peeled off and falls onto the hopper 17 provided at the bottom of the electrolytic cell 11.
- the scale S collected in the hopper 17 is discharged together with the cooling water W in the electrolytic cell 11 by opening the valve B of the discharge pipe 18 (FIG. 3D).
- the cooling water W in the electrolytic cell 11 is exhausted because it is rich in minerals due to the dissolution of a part of the mineral from the scale S that has been peeled off.
- the capacity of the electrolytic cell 11 is extremely small compared to the cooling tower 3, the amount of discharge is small compared with the conventional case where all the water in the circulation path R1 is replaced at regular intervals. Tesumi can reduce wasteful consumption of water resources.
- the no-pass pump P2 is operated to restart the supply of the cooling water W to the bypass path R2.
- a DC voltage is applied between the electrodes 12A and 12B (hereinafter referred to as the second electrolysis step, which corresponds to the electrolysis step of the present invention).
- minerals such as calcium ions, magnesium ions and sodium ions contained in the cooling water are deposited on the surface of the second electrode 12B on the cathode side as scale S.
- the deposited scale S is gradually deposited on the second electrode 12B on the cathode side, as in the first electrolysis process described above. It gradually accumulates (Fig. 4F). Therefore, after the operation for a predetermined time, the anode-cathode is turned over again (FIG. 5G), and the accumulated scale S is removed (discharge process, FIG. 5H). In this way, the first electrolysis process and the second electrolysis process are repeated with the discharge process in between. [0029] Thus, electrolysis is performed while inverting the polarities of the pair of electrodes 12A and 12B every predetermined time and removing the scale S accumulated on the cathode.
- the mineral content is removed, the hardness of the cooling water W is lowered, and scale adhesion in the circulation path R1 can be prevented.
- the electrolytic treatment produces hypochlorous acid and the like having sterilizing ability in the cooling water W. This can prevent the growth of microorganisms in the circulation path R1.
- a rate monitoring function is provided. That is, the controller 14 monitors the current and voltage values between the pair of electrodes 12A and 12B every predetermined time during the electrolysis process, and calculates the conductivity of the cooling water W based on these values. Then, if the conductivity exceeds a predetermined value, it is determined that the hardness of the cooling water W has risen to an extent that the electrolysis device 10 alone cannot cope with it, and the operation of the cooling water circulation device 1 is stopped. Replace the cooling water W in the circulation path R1. In this way, it is possible to monitor the hardness of the cooling water W without providing a special device such as a conductivity meter, and to respond to sudden situations such as rapid evaporation of moisture.
- the electrolyzer 10 is provided in the cooling water circulation path R1.
- mineral components such as calcium ions and magnesium ions contained in the cooling water W are deposited as scale S on the electrodes 12A and 12B in the electrolysis process.
- the mineral content can be removed from the cooling water W.
- the hardness of the cooling water W increases due to evaporation of moisture over time, the hardness can be reduced by electrolytic treatment. As a result, adhesion of scale S in the circulation path R1 can be reduced.
- the scale S deposited on the electrodes 12A and 12B can be easily peeled off by performing the operation by inverting the polarities of the electrodes 12A and 12B every predetermined time. Thereby, maintenance of the electrolyzer 10 can be easily performed. Since the replacement of the cooling water W in the circulation path R1 can be minimized, the waste of water resources can be suppressed.
- hypochlorous acid having sterilizing ability is generated in the cooling water W. To do. Thereby, propagation of microorganisms can be prevented. In this way, it is possible to suppress the adhesion of microorganisms and scales in the circulation path R1 without using a chemical solution with a large environmental load.
- the electrolyzer is provided on a bypass path R2 provided in the circulation path R1.
- the electrolyzer 10 when performing the maintenance of the electrolyzer 10, only the electrolyzer 10 need not be stopped, and the entire coolant circulation device 1 need not be stopped. This facilitates maintenance.
- the conductivity of the cooling water W is monitored based on the current and voltage values between the pair of electrodes 12A and 12B. This makes it possible to monitor the hardness of the cooling water W without providing a special device such as a conductivity meter, and to respond to sudden situations such as rapid evaporation of moisture.
- An anode made of a 100 mm ⁇ 200 mm platinum plating plate and a cathode made of a 100 mm ⁇ 200 mm mesh platinum plating material were installed inside an electrolytic cell having a capacity of 8 liters. The distance between both electrodes was 70 mm. In addition, a stir bar was introduced into the electrolytic cell so that the electrolyte solution could be stirred.
- test solution prepared in (2) above 5 liters of the test solution prepared in (2) above was placed in an electrolytic cell so that the anode and cathode were immersed in the test solution up to 72 mm X 200 mm. In this state, while rotating the stirrer, a voltage was applied between both electrodes at 20 V and 0.5 A to perform electrolysis. 100 ml of the test solution was sampled at predetermined time intervals, and temperature, pH, electrical conductivity, M alkalinity, hardness, and chloride ion were measured. Measurements were performed according to IS K 0101. When collecting test solution The same amount of new test solution was replenished.
- Table 1 shows the measurement results of the test solution temperature, pH, electrical conductivity, M alkalinity, hardness, and salt ion immediately before the start of the electrolysis test and 1 hour, 2 hours, and 3 hours after the start of the electrolytic test. .
- Table 2 shows the electrode weight difference when the current was 0.5 A, and the measurement results of the test solution temperature, pH, electrical conductivity, M alkalinity, hardness, and free chlorine concentration.
- Table 3 shows the results when the current was 1.0 A.
- the test was performed in the same manner as in Preliminary Test 3-1, except that the distance between the electrodes was 9.3 cm and the applied voltage was 25 V.
- the test was conducted in the same manner as in Preliminary Test 3-1, except that the distance between the electrodes was 31.2 cm and the applied voltage was 55 V.
- Table 4 shows the electrode weight difference when the applied voltage is 15 V, 25 V, and 55 V, and the test solution temperature, pH, electrical conductivity, M alkalinity, hardness, free chlorine concentration, and chloride ion measurement results. It was.
- Cooling water was collected from a cooling tower of Hyundai Motor Co., Ltd., and electrolysis was performed for 1 hour at a distance of 10 mm between electrodes, a current of 0.5 A, and a voltage of 13 V using the same electrolysis apparatus as in Preliminary Experiment 1 above.
- the test solution before and after electrolysis was measured for temperature, pH, electrical conductivity, M alkalinity, hardness and free chlorine concentration.
- Example 1-1 The test was conducted in the same manner as in Example 1-1 except that the distance between the electrodes was 20 mm, the current was 0.5 A, and the voltage was 21 V.
- Example 1-1 The test was performed in the same manner as in Example 1-1 except that the distance between the electrodes was 10 mm, the current was 1.5 A, and the voltage was 28 V.
- Table 5 shows the measurement results of the test solution temperature, pH, electrical conductivity, M alkalinity, hardness, and chloride ion in each Example.
- concentration of free chlorine was extremely small and could not be measured.
- Cooling water was collected from the cooling tower of Aisin Seiki Co., Ltd.'s Shintoyo Plant, and electrolysis was performed for 3 hours at an electrode distance of 53 mm, a current of 0.25 A, and a voltage of 8 V using the same electrolysis system as in Preliminary Experiment 1 above.
- the amount of scale adhered was measured from the weight difference of the cathode before and after electrolysis.
- the test solution before and after electrolysis was measured for pH, electrical conductivity, M alkalinity, hardness, chloride ion, free chlorine concentration, and ionic silica.
- the Langeria index was calculated from the measured values.
- Table 6 shows the pH, electrical conductivity, M alkalinity, hardness, salt ion, free chlorine concentration, ionic silica, and Langeria index of the test solution in each example. It should be noted that the same measurement was performed for the replenishing water replenished to the cooling unit, and the results are also shown.
- the cooling tower power collected was much richer in minerals than the original water (make-up water).
- the electrical conductivity, M alkalinity, and hardness decreased, and the scale adhered to the cathode.
- the difference in weight of the cathode before and after electrolysis was 0.54 g. From this, it can be said that minerals such as calcium ions and magnesium ions have been removed from the cooling water by electrolysis. Also, the concentration of ionic silica that causes scale as well as calcium ions and magnesium ions. It was also reduced that it was removed from the cooling water as well.
- the Langeria index which is a measure of the ease of scale adhesion, has decreased, it is difficult for the cooling water to generate scale due to electrolysis! /, Becoming water! / It has been shown.
- bypass path R2 is provided and the electrolyzer 10 is installed here, but the bypass tower is not provided, and the cooling tower, the heat exchanger ⁇ and the electrolyzer are connected by a flowing water pipe. It may be good to form.
- both ends of the bypass path may be connected to the water pipe 4, for example.
- the cooling water circulation device of the present embodiment is not particularly limited as a power-cooled device that was used for circulating the cooling water W to the heat exchanger 2 provided in the air cooling device, the refrigeration device, or the like. Any device may be used as long as it is cooled by circulating cooling water.
- cooling water circulation device capable of suppressing the adhesion of microorganisms and scales while considering the environment, and a scale removal method for the cooling water circulation device.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/012954 WO2006027825A1 (ja) | 2004-09-06 | 2004-09-06 | 冷却水循環装置、および冷却水循環装置のスケール除去方法 |
US11/661,678 US8475645B2 (en) | 2004-09-06 | 2004-09-06 | Cooling water circulation apparatus and method of removing scale from cooling water circulation apparatus |
JP2006534938A JP4644677B2 (ja) | 2004-09-06 | 2004-09-06 | 冷却水循環装置 |
CN2004800438824A CN101010556B (zh) | 2004-09-06 | 2004-09-06 | 冷却水循环装置及其水垢去除方法 |
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PCT/JP2004/012954 WO2006027825A1 (ja) | 2004-09-06 | 2004-09-06 | 冷却水循環装置、および冷却水循環装置のスケール除去方法 |
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JP4888869B1 (ja) * | 2011-01-07 | 2012-02-29 | イノベーティブ・デザイン&テクノロジー株式会社 | 給湯器用スケール成分除去装置 |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2006027825A1 (ja) | 2008-05-08 |
CN101010556B (zh) | 2011-08-31 |
CN101010556A (zh) | 2007-08-01 |
US8475645B2 (en) | 2013-07-02 |
JP4644677B2 (ja) | 2011-03-02 |
US20080115925A1 (en) | 2008-05-22 |
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