CN106061904B - Electrolysis system - Google Patents
Electrolysis system Download PDFInfo
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- CN106061904B CN106061904B CN201580011684.8A CN201580011684A CN106061904B CN 106061904 B CN106061904 B CN 106061904B CN 201580011684 A CN201580011684 A CN 201580011684A CN 106061904 B CN106061904 B CN 106061904B
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- seawater
- recirculation line
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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
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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
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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
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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
- C02F2001/46133—Electrodes characterised by the material
- C02F2001/46138—Electrodes comprising a substrate and a coating
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The present invention provides an electrolysis system (1), wherein the electrolysis system (1) comprises: an electrolysis device (2) which has an electrolytic cell (6) as an electrode for housing an anode and a cathode and electrolyzes a liquid to be treated; a conditioning tank (3) for temporarily storing the liquid to be treated by the electrolysis device (2); a recirculation line (10) for returning a part of the storage liquid (R) stored in the adjustment tank (3) and containing the fine particles and the precipitated substances precipitated from the fine particles to the electrolytic tank (6); and a prevention unit (18) that prevents the precipitated substances from precipitating in the adjustment tank (3).
Description
Technical Field
The present invention relates to an electrolysis system including an electrolysis device for electrolyzing a liquid to be treated such as seawater.
This application claims priority in accordance with Japanese patent application No. 2015-028499 filed on 2/17 of 2015, the contents of which are incorporated herein by reference.
Background
In a thermal power plant, a nuclear power plant, a large-scale seawater desalination plant, a large-scale chemical plant, and the like, which have conventionally used a large amount of seawater, it has been a major problem that algae and shellfish are attached and propagated to portions of the plant, such as a water inlet, piping, a condenser, and various coolers, which come into contact with seawater.
To solve this problem, an electrolysis system has been proposed which generates chlorinated soda (chlorine, sodium hypochlorite) by electrolyzing natural seawater. The system suppresses the adhesion of marine organisms by injecting an electrolyte containing chlorinated soda into a water inlet (for example, see patent document 1). In general, in this system, scale is generated by scale components such as magnesium ions in seawater.
Patent document 1 describes an apparatus for supplying air to a liquid to be treated in order to prevent scale from adhering to electrodes of an electrolysis apparatus accompanying electrolysis treatment. The device increases the flow velocity of the electrode surface and forms turbulent flow by blowing air into the liquid to be treated, thereby improving the cleaning effect of the electrode.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4932529
Disclosure of Invention
Problems to be solved by the invention
However, in a system in which a liquid to be treated discharged from an electrolysis apparatus is circulated through a conditioning tank (circulation tank), there is a problem that scale deposits on the bottom of the conditioning tank where electrolysis is performed (electrode surface) and the conditioning tank where the liquid to be treated is temporarily stored.
In order to remove the precipitated scale, a large-scale process such as an acid washing process is required, and there is a problem that the running cost of the electrolysis system increases.
The invention aims to provide an electrolysis system capable of preventing deposition of precipitated substances (scale) on the bottom of a regulating tank.
Technical scheme
According to a first aspect of the present invention, an electrolysis system is characterized by comprising: an electrolysis device having an electrolytic cell for housing an anode and a cathode as electrodes and electrolyzing a liquid to be treated; a conditioning tank for temporarily storing the liquid to be treated processed by the electrolysis device; a recirculation line for returning a part of the storage liquid stored in the adjustment tank and containing fine particles and a precipitated substance precipitated from the fine particles to the electrolytic tank; and a prevention unit that prevents the precipitated substances from precipitating in the adjustment tank.
According to the above configuration, the preventing unit can prevent the precipitated substances from being precipitated at the bottom of the regulating tank.
Further, by returning the stock solution to the electrolytic bath, fine particles contained in the stock solution are detached along with precipitated substances generated on the electrode surface. This prevents the deposition of the precipitated substances on the electrode surface. That is, the fine particles contained in the stock solution returned to the electrolytic cell act as seed crystals, and the growth of the precipitated substances on the electrode surface can be suppressed.
Further, by causing precipitation substances such as calcium carbonate and magnesium hydroxide, which precipitate as the pH of the treatment target liquid rises with electrolysis, to precipitate on the surface of fine particles (seed crystals) which are separated from the electrode surface and suspended in the liquid, the precipitation substances can be prevented from precipitating on the cathode surface.
In the above electrolysis system, the prevention unit may have a discharge pipe that discharges the liquid to the adjustment tank.
According to the above configuration, the liquid is injected through the discharge pipe, thereby stirring the stored liquid in the adjustment tank. This can improve the effect of preventing the substances from precipitating at the bottom of the adjustment tank.
In the above electrolysis system, the discharge pipe may discharge the liquid in a direction in which a swirling flow is generated in the stock liquid stored in the adjustment tank.
According to the above configuration, the effect of preventing the precipitated substances from precipitating at the bottom of the adjustment tank can be enhanced by stably stirring the precipitated substances contained in the storage liquid.
In the above electrolysis system, the preventing unit may be an air-type stirring device having a wall material extending in an up-down direction of the conditioning tank and dividing an interior of the conditioning tank into a rising portion and a falling portion, and an air supplying portion supplying air to a lower portion of the rising portion.
According to the structure, the stirring and dispersing effects of the storage liquid can be obtained through the air blasting power of the air. This can improve the effect of preventing the substances from precipitating at the bottom of the adjustment tank.
In the above electrolysis system, the preventing unit may be a mechanical stirring device that mechanically stirs the storage liquid in the adjustment tank.
According to the above structure, the stock solution is forcibly stirred. This can improve the effect of preventing the substances from precipitating at the bottom of the adjustment tank.
In the above electrolytic system, the anode may be coated with titanium by a coating material containing iridium oxide.
According to the above configuration, even in the anode in which titanium is coated with a coating material containing iridium oxide to which manganese scale is likely to adhere during electrolysis, the growth of precipitated substances on the electrode surface can be suppressed.
The electrolysis system may further include: an injection line for supplying a part of the electrolyte from the recirculation line to a predetermined location; a seawater supply line for supplying seawater to the adjustment tank; and a diversion pipeline which diverts a part of the seawater in the seawater supply pipeline to the injection pipeline.
According to the structure, the seawater can be injected through the shunt pipeline, so that the flow velocity of the injection pipeline is accelerated. Thus, even when the distance of the injection line is long and the precipitated substance is easily precipitated, the precipitated substance can be prevented from being deposited due to the decrease in the flow rate of the injection line.
Advantageous effects
According to the present invention, it is possible to prevent substances from precipitating at the bottom of the adjustment tank.
Drawings
Fig. 1 is a schematic diagram showing an outline of an electrolysis system according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view schematically showing an electrolytic cell constituting an electrolytic device according to a first embodiment of the present invention.
Fig. 3 is a schematic view of the adjustment tank according to the first embodiment of the present invention as viewed from above.
Fig. 4 is a schematic diagram showing an outline of an electrolysis system according to a second embodiment of the present invention.
Fig. 5 is a schematic diagram showing an outline of an electrolysis system according to a third embodiment of the present invention.
Fig. 6 is a schematic diagram showing an outline of an electrolysis system according to a fourth embodiment of the present invention.
FIG. 7 is a perspective view of an adjustment tank of an electrolysis system according to a fifth embodiment of the present invention.
Detailed Description
(first embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic diagram showing an outline of an electrolysis system 1 according to the present embodiment. The electrolysis system 1 of the present embodiment is a system for generating an electrolyte E containing chlorinated soda (chlorine, sodium hypochlorite) by electrolyzing a treatment target liquid such as seawater W.
The electrolysis system 1 of the present embodiment supplies the electrolyte E containing chlorambu to a predetermined place such as a piping of a cooling facility of a large facility such as a thermal power plant, a nuclear power plant, a large seawater desalination facility, a large chemical facility, a large iron-making facility, or the like, or a nitrogen treatment tank for storing nitrogen-containing wastewater, through the injection line 13.
The electrolysis system 1 includes a seawater supply pump 5 for introducing seawater W required for electrolysis, a conditioning tank 3 for temporarily storing the electrolyte E (seawater W) treated by the electrolysis apparatus 2, an annular recirculation line 10 for circulating the electrolyte E, and an injection line 13 for injecting the electrolyte E circulating along the recirculation line 10 into, for example, a pipe of a large-sized facility.
The recirculation line 10 is constituted by a first recirculation line 11 and a second recirculation line 12.
The adjustment tank 3 is a tank having a bottomed cylindrical shape that stores an electrolyte E circulating along the system and seawater W supplied from a seawater supply pump 5. The conditioning tank 3 includes a fan (not shown) for supplying air to the gas phase in the conditioning tank 3. The shape of the adjustment groove 3 is not limited to the bottomed cylinder shape, and may be a rectangular parallelepiped shape.
The electrolyzer 2 is an apparatus for electrolyzing seawater W in the middle of the recirculation line 10. The electrolyzer 2 has an electrolyzer 6 and a DC power supply 7 (rectifier). The electrolyzer 2 is an apparatus for generating chlorinated soda by electrolyzing seawater W.
As shown in FIG. 2, the electrolytic bath 6 is composed of an electrode support case 26, a terminal plate 28 and a plurality of electrodes 30. The electrolytic cell 6 houses an anode a and a cathode K as electrodes 30. The electrolytic cell 6 has an inlet 15 for introducing the electrolytic solution E into the electrolytic cell 6 and an outlet 16 for discharging the electrolytic solution E from the electrolytic cell 6.
The terminal plate 28 has a function of supplying an electric current from the outside of the electrolytic cell 6 to the electrode 30 supported in the electrode supporting case 26. One terminal plate 28 is disposed at each end of the electrode support case 26.
The electrodes 30 are plate-shaped, and a plurality of the electrodes are fixed and supported in an aligned state on the support rods 26a of the electrode support case 26. In the present embodiment, three types of bipolar electrode plates 31, anode plates 32, and cathode plates 33 are used as the electrodes 30.
The bipolar electrode plate 31 is formed by bisecting a titanium substrate as an electrode substrate, and one of them is an anode a and the other is a cathode K. That is, the bipolar electrode plate 31 is configured such that the half area on one end side is an anode a whose surface is coated with a coating material containing iridium oxide (coating material mainly containing iridium oxide), and the half area on the other end side is a cathode K whose surface is not coated with the coating material mainly containing iridium oxide.
The anode plate 32 is configured such that the entire surface of the titanium substrate is coated with a coating material mainly composed of iridium oxide. The anode plate 32 functions as an anode a during electrolysis as a whole. As the cathode plate 33, an uncoated titanium substrate was used. The cathode plate 33 functions as a cathode K in the electrolysis as a whole.
Next, the arrangement structure of the three kinds of electrodes 30 in the electrode supporting case 26 will be explained. The bipolar electrode plate 31, the anode plate 32 and the cathode plate 33 are respectively fixedly supported by support rods 26a in the electrode support case 26.
As shown in fig. 2, the plurality of bipolar electrode plates 31 in the electrode 30 are arranged such that the anode a faces the liquid inlet side and the cathode K faces the liquid outlet side. The bipolar electrodes 31 are arranged such that the extending direction of the bipolar electrodes 31 is along the flow direction of the seawater W. The plurality of bipolar electrode plates 31 are arranged in series at intervals in the flow direction of the seawater W to form an electrode group M. The electrode group M is provided in plurality at intervals in parallel with each other. The plurality of electrode groups M are arranged in parallel with each other.
The dc power supply device 7 is a device for supplying electric current to electrolyze seawater W. The dc power supply device 7 may be configured to include a dc power supply and a constant current control circuit, for example. The dc power supply is a power supply that outputs dc power, and may be configured to rectify and output ac power output from an ac power supply into dc power, for example.
The seawater supply pump 5 and the adjustment tank 3 are connected by a seawater supply line 4. A filter for preventing foreign matter that interferes with electrolysis from being mixed may be provided in the seawater supply line 4.
The regulating vessel 3 and the inflow opening 15 of the electrolysis vessel 6 are connected via a first recirculation line 11. That is, a part of the electrolyte E (storage liquid R) in the adjustment tank 3 is introduced into the electrolytic tank 6 through the first recirculation line 11. An injection pump 17 is provided on the first recirculation line 11. The injection pump 17 is a pump for supplying the circulating electrolyte E to the adjustment tank 3 and feeding the electrolyte E to the injection line 13.
The second recirculation line 12 is a line connecting the outflow opening 16 of the electrolysis cell 6 and the regulating tank 3. That is, the electrolytic solution E generated by the electrolytic device 2 is introduced into the adjustment tank 3 via the second recirculation line 12.
An injection nozzle (not shown) is provided at a downstream end of the injection line 13. By providing the injection nozzle, the soda chloride produced by the electrolysis apparatus 2 can be efficiently diffused into the piping of the facility.
A discharge pipe 18 for discharging the electrolyte E into the adjustment tank 3 is provided at a connection portion between the second recirculation line 12 and the adjustment tank 3 in the present embodiment. In other words, the electrolyte E circulating along the recirculation line 10 and supplied to the adjustment tank 3 is discharged to the storage liquid R stored in the adjustment tank 3 via the discharge pipe 18.
The discharge pipe 18 is a tubular member and is disposed so as to swirl the stock liquid R in the adjustment tank 3. As shown in fig. 3, the discharge pipe 18 is oriented such that the discharged electrolyte E is discharged along the outer peripheral surface 3a of the adjustment tank 3 when viewed from above. In other words, the discharge pipe 18 is disposed (tangentially) so that the extending direction of the discharge pipe 18 is along the tangential direction of the outer peripheral surface 3a of the adjustment tank 3.
Next, the operation of the electrolysis system 1 of the present embodiment will be described.
First, seawater W is introduced into the adjustment tank 3 through the seawater supply line 4. The seawater W is introduced into the first recirculation line 11, the electrolytic cell 6, and the second recirculation line 12, and circulated. In this step, seawater W is returned to the electrolytic cell 6 via the first recirculation line 11. Thereby, the electrodes 30 (cathode K and anode a) in the electrolytic bath 6 are immersed in the seawater W.
The electrolyte E circulating through the second recirculation line 12 is discharged to the reservoir R in the adjustment tank 3 through the discharge pipe 18.
An electric current is passed through the seawater W between the electrodes 30, thereby electrolyzing the seawater W.
That is, as shown in the following formula (1), the anode a deprives electrons e from chloride ions in the seawater W, and oxidizes the seawater W to generate chlorine.
2Cl-→Cl2+2e-...(1)
On the other hand, at the cathode K, electrons are given to water in the seawater W to reduce the water, thereby generating hydroxide ions and hydrogen gas, as shown in the following formula (2).
2H2O+2e-→2OH-+H2...(2)
Further, as shown in the following formula (3), the hydroxide ions generated at the cathode K react with sodium ions in the seawater W to generate sodium hydroxide.
2Na++2OH-→2NaOH ...(3)
Further, as shown in formula (4), sodium hydroxide reacts with chlorine to produce hypochlorous acid, sodium chloride and water.
Cl2+2NaOH→NaClO+NaCl+H2O ...(4)
Thus, sodium hypochlorite having an effect of suppressing adhesion of marine products is generated by electrolysis of seawater W.
Since the concentration of chloride ions in the seawater W is high at 30,000 to 40,000mg/l, the concentration of sodium hypochlorite is preferably set to 500 to 5,000 ppm.
Here, in general, the seawater W and the electrolyte E returned to the electrolytic bath 6 contain scale components (fine particles for precipitating scale and scale lumps, and function as seed crystals for precipitating scaleParticles for use) such as magnesium ions (Mg)2+) Calcium ion (Ca)2+) Manganese ion (Mn)2+) Silicic acid ([ SiO ]x(OH)4-2x]n)。
In addition, in general, manganese scale, which is a precipitated substance generated by manganese ions contained in seawater W, adheres to the anode a coated with a coating material mainly composed of iridium oxide during electrolysis. The adhesion of the manganese scale causes the consumption of the anode a to be increased, and the catalytic activity on the surface of the electrode 30 to be decreased, thereby decreasing the efficiency of chlorine generation. Scale generated by magnesium and calcium contained in seawater W adheres to cathode K, and the consumption of electrode 30 is also increased by the scale.
In the electrolysis system 1 of the present embodiment, the electrolytic solution E circulating from the second recirculation line 12 generates a swirling flow in the storage solution R through the discharge pipe 18. This prevents the precipitation of scale contained in the electrolyte E and the storage liquid R.
That is, the discharge pipe 18 functions as a prevention means for preventing the precipitation of scale.
In the electrolytic system 1 of the present embodiment, the scale component and the scale contained in the electrolyte E are separated from the scale formed on the surface of the electrode 30. That is, the scale particles contained in the inflowing electrolyte E act as seed crystals to detach the scale on the surface of the electrode 30. This can suppress the accumulation of scale on the surface of the electrode 30.
Further, the pH (hydrogen ion index) of the electrolyte E increases with the electrolysis and becomes highly alkaline, whereby scale components are deposited as scale such as calcium hydroxide and magnesium hydroxide.
In the electrolytic system 1 of the present embodiment, the electrolyte E containing the scale component is returned to the electrolytic bath 6, and thereby scale such as calcium carbonate or magnesium hydroxide is deposited on the surface of the scale component separated from the electrode 30 and suspended in the liquid. This prevents the deposition of scale on the surface of the cathode K.
The electrolyzed seawater W flows out of the outlet 16 of the electrolytic cell 6 as the electrolytic solution E together with hydrogen gas, and is stored in the adjustment tank 3 through the second recirculation line 12. In the adjustment tank 3, hydrogen gas generated by the electrolytic reaction is stored on the gas phase side. The hydrogen gas is diluted to below the explosion limit by the air supplied to the gas phase, and then discharged.
The storage liquid R containing the electrolyte E stored in the adjustment tank 3 is introduced into the injection line 13 by the injection pump 17, and is then injected into a predetermined place such as a pipe of a cooling facility. That is, the electrolyte E containing the chlorinated soda is injected to a predetermined place through the injection pipe 13 by the operation of the injection pump 17.
According to the above embodiment, by injecting the electrolyte E containing soda chloride into a predetermined place such as a pipe of a cooling facility through the injection line 13, it is possible to effectively suppress adhesion of marine organisms.
Further, nitrogen components contained in the nitrogen-containing wastewater discharged from the large-scale facility can be removed through the injection line 13. That is, the nitrogen component contained in the wastewater can be removed by injecting the electrolyte E containing soda chloride into the nitrogen treatment tank storing the nitrogen-containing wastewater.
Further, the electrolyte E is discharged to the adjustment tank 3 through the discharge pipe 18, and a swirling flow is generated in the stock solution R in the adjustment tank 3. This prevents the scale from settling at the bottom of the adjustment tank 3. That is, the scale is continuously suspended in the storage liquid R by the swirling flow. Thus, scale is less likely to accumulate in the bottom of the adjustment tank 3, and the burden of the scale removal process can be reduced, thereby improving maintainability.
Further, by returning the stock solution R to the electrolytic bath 6, the scale components contained in the stock solution R are detached together with the scale produced on the surface of the electrode 30. This prevents scale from accumulating on the surface of the electrode 30. That is, the scale particles contained in the stock solution R returned to the electrolytic bath 6 function as seed crystals, and the deterioration of the electrodes can be reduced.
Further, by preventing the accumulation of scale on the surface of the electrode 30, the increase in electrolytic voltage (deterioration in power consumption) can be suppressed.
Further, the occurrence of sparks due to short-circuiting of the electrodes 30 can be prevented, and safety can be improved.
Further, by depositing scale such as calcium carbonate and magnesium hydroxide, which is deposited as the pH of the electrolyte E rises due to electrolysis, on the surface of scale particles (seed crystals) separated from the surface of the electrode 30 and suspended in the liquid, it is possible to prevent the deposition of scale on the surface of the cathode.
In addition, even in the anode a coated with titanium, which is a coating material containing iridium oxide to which manganese scale is likely to adhere during electrolysis, scale growth on the surface of the electrode 30 can be suppressed.
In addition, the pollutants (NH) contained in the seawater W3COD, etc.) is oxidatively decomposed by chlorinated soda, whereby electrode deterioration due to oxidation of the turbid substance at the electrode 30 (anode a) can be prevented.
In the above embodiment, the electrolyte E is discharged through the discharge pipe 18, but the present invention is not limited to this. For example, the seawater W supplied via the seawater supply pump 5 may be discharged through the discharge pipe 18. That is, the rotational flow of the stock solution R stored in the adjustment tank 3 may be generated.
(second embodiment)
An electrolytic system 1B according to a second embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, portions different from those of the first embodiment are mainly described, and descriptions of the same portions are omitted.
As shown in fig. 4, the conditioning tank 3 of the electrolysis system 1B of the present embodiment is provided with a mechanical stirring device 20 that mechanically stirs the stock solution R in the conditioning tank 3, instead of the discharge pipe 18 of the first embodiment. The mechanical stirrer 20 is a scale deposit prevention means similar to the discharge pipe 18.
The mechanical stirring device 20 has a motor 21 and a propeller 22, wherein the motor 21 has an output shaft, and the propeller 22 is disposed on the output shaft of the motor 21.
The stock solution R stored in the adjustment tank 3 is forcibly stirred by operating the mechanical stirring device 20. In other words, scale components (particles) contained in the electrolyte E stored in the adjustment tank 3 and the scale are carried by the water flow formed by the mechanical stirring device 20 and do not precipitate.
According to the above embodiment, the stock solution R stored in the adjustment tank 3 is forcibly stirred by using the mechanical stirring device 20. This prevents the scale from settling at the bottom of the adjustment tank 3.
(third embodiment)
An electrolytic system 1C according to a third embodiment of the present invention will be described below with reference to the drawings.
As shown in fig. 5, an air-type stirring device 34 is provided in the adjustment tank 3 of the electrolysis system 1C of the present embodiment in place of the discharge pipe 18 of the first embodiment. The air stirrer 34 has a wall member 36 positioned in the conditioning tank 3 and an air supply unit 35 for supplying air to the reservoir liquid R.
The wall member 36 is a plate-like member extending in the vertical direction of the adjustment groove 3 and dividing the inside of the adjustment groove 3. The wall material 36 is sized to create a predetermined gap between the lower end of the wall material 36 and the bottom of the adjustment tank 3 and between the upper end of the wall material 36 and the liquid surface of the reservoir liquid R.
The air supply unit 35 supplies air to a lower portion of one space defined by the wall material 36. The air supply unit 35 includes a blower (not shown) for increasing the pressure of air to be pressurized air, and a nozzle 37 for supplying the pressurized air to the reservoir liquid R.
The nozzle 37 supplies air to a lower portion of one space defined by the wall material 36 in the storage liquid R. Pressurized air is supplied through the nozzle 37, and one space becomes a rising portion 38 where air rises from the bottom. The pressurized air rises and escapes from the top to the outside. Therefore, almost no air is present in the other space (the descending portion 39). The stock solution R in the adjustment tank 3 circulates between the rising portion 38 and the falling portion 39 due to the difference in density of the stock solution R between the rising portion 38 and the falling portion 39.
According to the above embodiment, the stirring and dispersing effect of the storage liquid R can be obtained by the explosive power of air.
In addition, the use of air increases the Dissolved Oxygen (DO) concentration, thereby promoting the oxidation of manganese ions, silicic acid, to manganese dioxide (MnO)2) Silicon dioxide (SiO)2) The scale component can be prevented from depositing scale on the surface of the electrode 30 (anode a).
Moreover, the explosion of air is carried out to increase the dissolved carbon dioxide (CO) in the electrolyte E (for example, pH8.5)3 2+) The concentration of the calcium ions promotes the reaction of the deposition of calcium carbonate, and the deposition of scale on the surface of the electrode 30 (cathode K) by the scale component can be prevented.
(fourth embodiment)
Next, an electrolytic system 1D according to a fourth embodiment of the present invention will be described with reference to the drawings.
As shown in fig. 6, a bypass line 41 (backup line) for directly introducing the seawater W supplied from the seawater supply pump 5 into the injection line 13 is provided between the seawater supply line 4 and the injection line 13 of the electrolysis system 1D of the present embodiment. That is, the electrolysis system 1 of the present embodiment can directly branch off the seawater W flowing along the seawater supply line 4 to the injection line 13 without sending the seawater W to the adjustment tank 3.
The diversion pipeline 41 is provided with a seawater diversion flow rate adjustment valve 42 for adjusting the flow rate of seawater W flowing along the diversion pipeline 41.
According to the above embodiment, the seawater W can be injected through the diversion line 41, thereby accelerating the flow velocity of the injection line 13. This can suppress the deposition of scale even when the distance of the injection line 13 is long and the pH of the electrolyte solution changes, thereby causing scale to be easily deposited. That is, the deposition of scale due to the decrease in the flow rate of the injection pipe 13 can be prevented. The flow rate of the seawater W injected through the diversion pipeline 41 can be appropriately adjusted by operating the seawater diversion flow rate adjustment valve 42.
(fifth embodiment)
An electrolytic system according to a fifth embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, portions different from those of the first embodiment are mainly described, and descriptions of the same portions are omitted.
As shown in fig. 7, a columnar structure 24 having a columnar shape extending in the vertical direction is provided at the center portion as viewed from above the adjustment groove 3 of the present embodiment. The columnar structure 24 is arranged substantially coaxially with the center axis of the bottomed cylindrical adjustment groove 3. Which is formed near the center of the swirling flow of the stock solution R formed by the discharge pipe 18.
According to the above embodiment, the formation of scale lumps in the center of the bottom 3b of the conditioning tank 3 can be suppressed.
In the electrolytic system of the present embodiment, the columnar structure 24 is provided to suppress the formation of scale lumps in the center of the bottom portion 3b of the conditioning tank 3, but the present invention is not limited to this. For example, a convex portion protruding upward may be formed in the central portion of the bottom portion 3b of the adjustment groove 3 to suppress the formation of scale lumps.
The shape of the columnar structure 24 is not limited to a cylindrical shape, and may be a prismatic shape. Further, the core does not have to be solid, and may be a cylindrical shape having a hollow portion inside.
While the embodiments of the present invention have been described in detail with reference to the drawings, the addition, omission, replacement, and other modifications of the structure may be made without departing from the scope of the present invention. The present invention is not limited to the embodiments, but is limited only by the claims.
Description of the symbols
1, 1B, 1C, 1D electrolysis system
2 electrolytic device
3 adjusting groove
3a outer peripheral surface
3b bottom
4 seawater supply pipeline
5 seawater supply pump
6 electrolytic cell
7 DC power supply device
10 recirculation line
11 first recirculation line
12 second recirculation line
13 injection line
15 flow inlet
16 outflow opening
17 injection pump
18 discharge pipe (prevention unit)
20 mechanical stirring device (prevention unit)
22 propeller
24 columnar structure
26 electrode supporting box
30 electrodes
31 bipolar electrode plate
32 anode plate
33 cathode plate
34 air type stirring device (preventing unit)
35 air supply part
36 wall material
37 nozzle
38 rising part
39 lowered part
41 shunt pipeline
42 seawater flow dividing and regulating valve
A anode
E electrolyte
K cathode
M electrode group
R stock solution
W sea water
Claims (5)
1. An electrolysis system having:
an electrolysis device having an electrolytic cell as an electrode for housing an anode and a cathode, and electrolyzing a liquid to be treated;
a conditioning tank connected to a seawater supply line for supplying seawater and temporarily storing the liquid to be treated by the electrolysis device;
a first recirculation line connecting the conditioning tank with the inflow of the electrolysis cell;
a second recirculation line connecting the conditioning tank with the outflow of the electrolytic tank; and
an preventing unit that prevents precipitated substances from precipitating in the regulating tank,
returning a part of a storage liquid stored in the adjustment tank and containing fine particles and the precipitated substances precipitated from the fine particles to the electrolytic tank via the first recirculation line,
the preventing unit has a discharge pipe that discharges the liquid to be treated into the storage liquid stored in the conditioning tank via the second recirculation line,
the discharge pipe discharges in a direction in which a swirling flow is generated in the stock solution stored in the adjustment tank,
seawater from the seawater supply line flows into the conditioning tank and from the conditioning tank into the electrolysis tank via the first recirculation line.
2. An electrolysis system having:
an electrolysis device having an electrolytic cell as an electrode for housing an anode and a cathode, and electrolyzing a liquid to be treated;
a conditioning tank connected to a seawater supply line for supplying seawater and temporarily storing the liquid to be treated by the electrolysis device;
a first recirculation line connecting the conditioning tank with the inflow of the electrolysis cell;
a second recirculation line connecting the conditioning tank with the outflow of the electrolytic tank; and
an preventing unit that prevents precipitated substances from precipitating in the regulating tank,
returning a part of a storage liquid stored in the adjustment tank and containing fine particles and the precipitated substances precipitated from the fine particles to the electrolytic tank via the first recirculation line,
the preventing means is an air-type stirring device having a wall material extending in the vertical direction of the conditioning tank and dividing the interior of the conditioning tank into a rising portion and a falling portion, and an air supplying portion supplying air to a lower portion of the rising portion,
seawater from the seawater supply line flows into the conditioning tank and from the conditioning tank into the electrolysis tank via the first recirculation line.
3. The electrolysis system of claim 1 or 2, wherein,
the anode is formed by coating titanium with a coating material containing iridium oxide.
4. The electrolysis system of claim 1 or 2, wherein,
the electrolysis system further has:
an injection line for supplying a part of the electrolytic solution from the first recirculation line to a predetermined place; and
a diversion pipeline that diverts a portion of the seawater in the seawater supply pipeline to the injection pipeline.
5. The electrolysis system of claim 4,
the anode is formed by coating titanium with a coating material containing iridium oxide.
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| JP2015-028499 | 2015-02-17 | ||
| JP2015028499A JP6344857B2 (en) | 2015-02-17 | 2015-02-17 | Electrolysis system |
| PCT/JP2015/057942 WO2016132565A1 (en) | 2015-02-17 | 2015-03-17 | Electrolysis system |
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| CN106061904A CN106061904A (en) | 2016-10-26 |
| CN106061904B true CN106061904B (en) | 2020-03-17 |
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| JP (1) | JP6344857B2 (en) |
| KR (1) | KR101910262B1 (en) |
| CN (1) | CN106061904B (en) |
| MY (1) | MY188112A (en) |
| SA (1) | SA516371888B1 (en) |
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| JP6484875B1 (en) * | 2018-11-16 | 2019-03-20 | 三菱重工環境・化学エンジニアリング株式会社 | Vertical electrolyzer |
| KR101965212B1 (en) * | 2019-01-23 | 2019-04-03 | 농업회사법인 주식회사 대율시스템 | Electrolysis apparatus |
| CN114686913B (en) * | 2022-03-29 | 2024-02-06 | 嘉庚创新实验室 | Electrochemical reaction equipment and storage device thereof |
Citations (3)
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| JP2005021744A (en) * | 2003-06-30 | 2005-01-27 | Kurita Water Ind Ltd | Method and apparatus for electrolyzing emulsion |
| CN1648069A (en) * | 2004-11-30 | 2005-08-03 | 东南大学 | Horizontal integrated three phase inner circulation fluidized reactor and its biological reaction process |
| CN103201412A (en) * | 2010-11-22 | 2013-07-10 | 三菱重工环境·化学工程株式会社 | Seawater electrolysis system and seawater electrolysis method |
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| JPS52109748A (en) * | 1976-03-10 | 1977-09-14 | Hitachi Ltd | Pre-treating method of brine |
| JPH04118090A (en) * | 1990-05-24 | 1992-04-20 | Konica Corp | Electrolytic treatment of water to be treated |
| JP2007144258A (en) * | 2005-11-24 | 2007-06-14 | Kurita Water Ind Ltd | Method for electrolyzing water and electrolytic apparatus |
| JP4932529B2 (en) * | 2007-02-21 | 2012-05-16 | 三菱重工環境・化学エンジニアリング株式会社 | Water treatment method |
| JP2009166176A (en) * | 2008-01-16 | 2009-07-30 | Aisin Seiki Co Ltd | Water-soluble coolant cleaning device |
| KR101071113B1 (en) * | 2010-06-07 | 2011-10-10 | 주식회사 한국종합기술 | Electrolysis apparatus |
| JP2012152695A (en) * | 2011-01-26 | 2012-08-16 | Jws Tecnica Kk | Electrolytic salt water sterilization method and electrolytic salt water sterilization device |
| EP2600070B1 (en) * | 2011-12-02 | 2015-05-27 | Mitsubishi Electric Corporation | Scale inhibiting device, water heater and water consumptive apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005021744A (en) * | 2003-06-30 | 2005-01-27 | Kurita Water Ind Ltd | Method and apparatus for electrolyzing emulsion |
| CN1648069A (en) * | 2004-11-30 | 2005-08-03 | 东南大学 | Horizontal integrated three phase inner circulation fluidized reactor and its biological reaction process |
| CN103201412A (en) * | 2010-11-22 | 2013-07-10 | 三菱重工环境·化学工程株式会社 | Seawater electrolysis system and seawater electrolysis method |
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| WO2016132565A1 (en) | 2016-08-25 |
| KR20160124177A (en) | 2016-10-26 |
| JP2016150298A (en) | 2016-08-22 |
| KR101910262B1 (en) | 2018-10-19 |
| JP6344857B2 (en) | 2018-06-20 |
| TWI564436B (en) | 2017-01-01 |
| TW201631221A (en) | 2016-09-01 |
| CN106061904A (en) | 2016-10-26 |
| SA516371888B1 (en) | 2019-09-05 |
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