JP6344857B2 - Electrolysis system - Google Patents

Description

  The present invention relates to an electrolysis system including an electrolyzer that electrolyzes a liquid to be treated such as seawater.

Conventionally, in thermal power plants, nuclear power plants, seawater desalination plants, chemical plants, etc. that use a large amount of seawater, the algae and shellfish that are in contact with seawater such as intakes, piping, condensers, and various coolers Adherence breeding has become an issue.
To solve this problem, electrolysis is performed on natural seawater to produce sodium hypochlorite (chlorine, sodium hypochlorite), and an electrolyte containing sodium hypochlorite is injected into the water inlet. Thus, an electrolysis system that suppresses the adhesion of marine organisms has been proposed (see, for example, Patent Document 1). In general, in this system, scale is generated due to scale components such as magnesium ions in seawater.

  The system described in Patent Document 1 describes an apparatus that supplies air into a liquid to be treated in order to prevent scale from adhering to an electrode of an electrolysis apparatus during electrolysis. According to this system, by blowing air, the cleaning effect of the electrode is improved by increasing the flow velocity on the electrode surface and making it turbulent.

Japanese Patent No. 4932529

However, in a system that circulates the liquid to be treated discharged from the electrolyzer to the adjustment tank (circulation tank), the scale is placed at the bottom of the electrolytic tank (electrode surface) for electrolysis and the adjustment tank for temporarily storing the liquid to be treated. There is a problem that lumps settle.
The removal of the precipitated scale requires a large-scale work such as an acid cleaning work, which increases the running cost of the electrolytic system.

  An object of the present invention is to provide an electrolysis system capable of preventing a deposited substance (scale) from being precipitated at the bottom of an adjustment tank.

According to the first aspect of the present invention, the electrolysis system includes an electrolytic cell in which an anode and a cathode are accommodated as electrodes, and is connected to an electrolysis apparatus that electrolyzes a liquid to be treated, and a seawater supply line that supplies seawater. And an adjustment tank that temporarily stores the liquid to be processed that has been processed by the electrolyzer, a first recycle line that connects the adjustment tank and the inlet of the electrolytic tank, and the adjustment tank and the electrolytic tank. A second recycle line connecting an outlet and a preventive means for preventing precipitation of a precipitated substance in the adjustment tank; the precipitation formed by depositing fine particles and the fine particles stored in the adjustment tank; some of the stored liquid containing a substance, said to return to the electrolytic cell via the first recycle line, said preventing means in said reservoir solution stored in the adjusting tank, through said second recycle line To discharge the liquid to be treated. A decane, the discharge tube is characterized by ejecting direction causing swirling flow in the reservoir solution stored in the adjustment tank.

According to such a structure, it can prevent that a deposit substance precipitates in the bottom part of an adjustment tank by a prevention means.
In addition, when the stored liquid is returned to the electrolytic cell, the fine particles contained in the stored liquid are desorbed along with the deposited substances generated on the electrode surface. Thereby, accumulation of the deposited substance on the electrode surface can be prevented. That is, the fine particles contained in the stored liquid returned to the electrolytic cell function as seed crystals, so that it is possible to suppress the growth of the deposited substance on the electrode surface.
In addition, precipitates such as calcium carbonate and magnesium hydroxide that precipitate due to the increase in pH of the liquid to be treated with electrolysis are separated from the electrode surface on the surface of fine particles (seed crystals) that float in the liquid. By precipitating, it is possible to prevent deposition of the depositing substance on the cathode surface.

  According to such a configuration, the liquid stored in the adjustment tank is agitated by injecting the liquid through the discharge pipe. Thereby, the effect which prevents that a deposit substance precipitates in the bottom part of an adjustment tank can be raised.

According to the second aspect of the present invention, the electrolysis system includes an electrolytic cell in which an anode and a cathode are accommodated as electrodes, and is connected to an electrolysis apparatus that electrolyzes a liquid to be treated, and a seawater supply line that supplies seawater. And an adjustment tank that temporarily stores the liquid to be processed that has been processed by the electrolyzer, a first recycle line that connects the adjustment tank and the inlet of the electrolytic tank, and the adjustment tank and the electrolytic tank. A second recycle line connecting an outlet and a preventive means for preventing precipitation of a precipitated substance in the adjustment tank; the precipitation formed by depositing fine particles and the fine particles stored in the adjustment tank; A part of the stored liquid containing the substance is returned to the electrolytic cell through the first recycling line, and the prevention means extends in the vertical direction of the adjustment tank and descends inside the adjustment tank with the rising portion. A wall member that is divided into parts, and the rise An air supply unit for supplying air to the bottom of, and wherein the pneumatic stirrer der Rukoto with.

  According to such a configuration, the agitation / dispersion effect of the stored liquid can be obtained by the aeration power of air. Thereby, the effect which prevents that a deposit substance precipitates in the bottom part of an adjustment tank can be raised.

In the electrolytic system, the anode may be coated with titanium coating containing iridium oxide.

  According to such a configuration, even when the anode is formed by coating titanium with a coating material containing iridium oxide, which easily adheres to manganese scale during electrolysis, the growth of deposited substances on the electrode surface is suppressed. can do.

According to the third aspect of the present invention, the electrolysis system includes an electrolytic cell in which an anode and a cathode are accommodated as electrodes, and is connected to an electrolysis apparatus that electrolyzes a liquid to be treated, and a seawater supply line that supplies seawater. And an adjustment tank that temporarily stores the liquid to be processed that has been processed by the electrolyzer, a first recycle line that connects the adjustment tank and the inlet of the electrolytic tank, and the adjustment tank and the electrolytic tank. A second recycle line connecting the outlet, a preventing means for preventing precipitation of precipitated substances in the adjustment tank, an injection line for supplying a part of the electrolyte from the first recycle line to a predetermined place, A part of the stored liquid that includes the branching line for branching a part of the seawater of the seawater supply line to the injection line, and that is stored in the adjustment tank and includes the fine particles and the precipitated substance formed by the precipitation of the fine particles. The first Lisa Via Kururain and returning to the electrolytic cell.

  According to such a configuration, the flow rate of the injection line can be increased by injecting seawater through the branch line. Thereby, even when the distance of the injection line is long and the precipitated substance is likely to precipitate, deposition of the precipitated substance due to a decrease in the flow rate of the injection line can be prevented.

  According to the present invention, it is possible to prevent the deposited substance from being precipitated at the bottom of the adjustment tank.

It is a mimetic diagram showing an outline of an electrolysis system of a first embodiment of the present invention. It is a longitudinal section showing an outline of an electrolytic cell which constitutes an electrolysis device of a first embodiment of the present invention. It is the schematic diagram seen from the upper direction of the adjustment tank of 1st embodiment of this invention. It is a schematic diagram which shows the outline | summary of the electrolysis system of 2nd embodiment of this invention. It is a schematic diagram which shows the outline | summary of the electrolysis system of 3rd embodiment of this invention. It is a schematic diagram which shows the outline | summary of the electrolysis system of 4th embodiment of this invention. It is a perspective view of the adjustment tank of the electrolysis system of a fifth embodiment of the present invention.

(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 an embodiment of the present invention. The electrolytic system 1 of the present embodiment is a system that generates an electrolytic solution E containing sodium hypochlorite (chlorine, sodium hypochlorite) by electrolyzing a liquid to be treated such as seawater W.

  The electrolysis system 1 of the present embodiment cools a plant such as a thermal power plant, a nuclear power plant, a seawater desalination plant, a chemical plant, and an iron manufacturing plant via an injection line 13 with an electrolyte E containing sodium hypochlorite. Supply to a predetermined place such as piping of equipment, nitrogen treatment tank in which wastewater containing nitrogen is stored.

The electrolysis system 1 includes a seawater supply pump 5 that introduces seawater W necessary for electrolysis, an adjustment tank 3 that temporarily stores an electrolytic solution E (seawater W) processed by the electrolysis apparatus 2, an electrolysis apparatus 2, and electrolysis An annular recycle line 10 that circulates the liquid E, and an injection line 13 that injects the electrolytic solution E that circulates through the recycle line 10 into, for example, plant piping.
The recycling line 10 includes a first recycling line 11 and a second recycling line 12.

  The adjustment tank 3 is a bottomed cylindrical tank that stores the electrolytic solution E circulating in the system and the seawater W supplied from the seawater supply pump 5. The adjustment tank 3 has a fan (not shown) that supplies air to the gas phase of the adjustment tank 3. The shape of the adjustment tank 3 is not limited to the bottomed cylindrical shape, and may be a rectangular parallelepiped shape.

The electrolysis apparatus 2 is an apparatus that electrolyzes seawater W in the middle of the recycle line 10, and includes an electrolysis tank 6 and a DC power supply apparatus 7 (rectifier). The electrolysis apparatus 2 is an apparatus that generates sodium hypochlorite by electrolyzing seawater W.
As shown in FIG. 2, the electrolytic cell 6 includes an electrode support box 26, a terminal plate 28, and a plurality of electrodes 30. The electrolytic cell 6 contains 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 role of supplying current from the outside of the electrolytic cell 6 to the electrode 30 supported in the electrode support box 26, and a pair is disposed at both ends of the electrode support box 26. .
The electrode 30 has a plate shape, and a plurality of electrodes 30 are fixedly supported on the support bar 26a of the electrode support box 26 in an arrayed state. In the present embodiment, three types of electrodes 30, a bipolar electrode plate 31, an anode plate 32, and a cathode plate 33 are used as the electrode 30.

  The bipolar electrode plate 31 has a structure in which a titanium substrate as an electrode substrate is divided into two, one of which is an anode A and the other is a cathode K. That is, the bipolar electrode plate 31 has a half region at one end side as an anode A whose surface is coated with a coating material containing iridium oxide (iridium oxide-based coating material), and a half region at the other end side. Is a cathode K whose surface is not coated with the above-mentioned iridium oxide-based coating material.

  The anode plate 32 has a structure in which the entire surface of the titanium substrate is coated with an iridium oxide-based coating material, and the entire anode plate 32 functions as the anode A during electrolysis. On the other hand, an uncoated titanium substrate is employed as the cathode plate 33, and the entire cathode plate 33 functions as the cathode K during electrolysis.

Here, the arrangement structure of the three types of electrodes 30 in the electrode support box 26 will be described. The bipolar electrode plate 31, the anode plate 32, and the cathode plate 33 are each fixedly supported by a support bar 26a in the electrode support box 26.
As shown in FIG. 2, the bipolar electrode plate 31 of the electrodes 30 has the anode A facing the liquid inlet side and the cathode K facing the liquid outlet side so that the extending direction is along the flow direction of the seawater W. Are arranged in multiple numbers. Further, these bipolar electrode plates 31 constitute an electrode group M by being arranged in series at intervals in the flow direction. A plurality of such electrode groups M are provided at intervals so as to be parallel to each other, that is, a plurality is provided in parallel with each other.

  The DC power supply device 7 is a device that supplies a current to be used for electrolysis of the seawater W. For example, a configuration including a DC power supply and a constant current control circuit can be employed. The DC power source is a power source that outputs DC power, and may be configured to rectify and output AC power output from the AC power source to DC, for example.

The seawater supply pump 5 and the adjustment tank 3 are connected by a seawater supply line 4. The seawater supply line 4 may be provided with a strainer for preventing entry of foreign substances that hinder electrolysis.
The adjustment tank 3 and the inlet 15 of the electrolytic cell 6 are connected by a first recycle line 11. That is, a part of the electrolytic solution E (reserved liquid R) in the adjustment tank 3 is introduced into the electrolytic tank 6 through the first recycling line 11. An injection pump 17 is provided on the first recycle line 11. The injection pump 17 is a pump that supplies the circulating electrolyte solution E to the adjustment tank 3 and transfers the electrolyte solution E to the injection line 13.

The second recycling line 12 is a line that connects the outlet 16 of the electrolytic cell 6 and the adjustment tank 3. That is, the electrolytic solution E generated in the electrolysis apparatus 2 is introduced into the adjustment tank 3 through the second recycle line 12.
An injection nozzle (not shown) is provided at the downstream end of the injection line 13. By providing the injection nozzle, sodium hypochlorite produced by the electrolysis apparatus 2 can be efficiently diffused into the plant piping.

A discharge pipe 18 that discharges the electrolytic solution E into the adjustment tank 3 is provided at a connection portion between the second recycling line 12 and the adjustment tank 3 of the present embodiment. In other words, the electrolytic solution E circulated through the recycle line 10 and supplied to the adjustment tank 3 is discharged to the stored 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 generate a swirling flow in the stored liquid R in the adjustment tank 3. As shown in FIG. 3, the discharge pipe 18 is oriented so that the electrolyte E discharged from above is discharged along the outer peripheral surface 3 a of the adjustment tank 3. In other words, the discharge pipe 18 is arranged (tangentially) so that the extending direction of the discharge pipe 18 is along the tangential direction of the outer peripheral surface 3 a 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. Seawater W is introduced into the first recycling line 11, the electrolytic cell 6, and the second recycling line 12 and circulated. In this step, the seawater W is returned to the electrolytic cell 6 via the first recycle line 11. Thereby, the electrode 30 (the cathode K and the anode A) in the electrolytic cell 6 is immersed in the seawater W.
Further, the electrolytic solution E circulated from the second recycling line 12 is discharged to the stored liquid R in the adjustment tank 3 through the discharge pipe 18.

Electrolysis is performed on the seawater W as a current flows through the seawater W between the electrodes 30.
That is, in the anode A, as shown in the following formula (1), electrons e are taken from chloride ions in the seawater W, oxidation occurs, and chlorine is generated.
2Cl ⁻ → Cl ₂ + 2e ⁻ (1)
On the other hand, at the cathode K, as shown in the following formula (2), electrons are given to the water in the seawater W to cause reduction, and hydroxide ions and hydrogen gas are generated.
2H ₂ O + 2e ⁻ → 2OH ⁻ + H ₂ (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)

Furthermore, as shown in the formula (4), sodium hydroxide and chlorine react to produce hypochlorous acid, sodium chloride, and water.
Cl ₂ + 2NaOH → NaClO + NaCl + H ₂ O (4)
Thus, based on the electrolysis of the seawater W, sodium hypochlorite having an inhibitory effect on the adhesion of marine products is generated.
The concentration of sodium hypochlorite is preferably 500 to 5,000 ppm because the chloride ion concentration of seawater W is increased to 30,000 to 40,000 mg / l.

Here, in general, the electrolyte solution E returned to the seawater W or the electrolytic cell 6 includes scale components (fine particles that precipitate scales, scale lumps, fine particles that function as seed crystals that precipitate scales), for example, magnesium ions (Mg ²⁺ ), calcium ions (Ca ²⁺ ), manganese ions (Mn ²⁺ ), and silicic acid ([SiO _X (OH) _4-2X ] _n ).

  Further, generally, the anode A coated with the iridium oxide-based coating material is adhered with manganese scale, which is a deposit due to manganese ions contained in the seawater W during electrolysis. Due to the adhesion of the manganese scale, the consumption of the anode A proceeds, and further, the catalytic activity on the surface of the electrode 30 decreases, resulting in a disadvantage that the chlorine generation efficiency decreases. Further, the cathode K is attached with a scale caused by magnesium or calcium contained in the seawater W, and the consumption of the electrode 30 also proceeds due to this scale.

  In the electrolysis system 1 of this embodiment, the swirling flow of the electrolyte E circulating from the second recycle line 12 is generated in the stored liquid R by the discharge pipe 18. Thereby, since the sedimentation of the scale contained in the electrolyte solution E and the stored liquid R is prevented, the discharge pipe 18 functions as a prevention means for preventing the sedimentation of the scale.

  In the electrolysis system 1 of the present embodiment, scale components and scales contained in the electrolytic solution E are detached with the scale generated on the surface of the electrode 30. That is, the scale fine particles contained in the electrolyte solution E that has flowed in function as seed crystals and desorb the scale on the electrode 30 surface. Thereby, accumulation of scale on the surface of the electrode 30 is suppressed.

Further, the pH (hydrogen ion index) of the electrolytic solution E increases with electrolysis and becomes highly alkaline, so that the scale component is deposited as a scale such as calcium hydroxide or magnesium hydroxide.
In the electrolysis system 1 of this embodiment, the scale component which floats scales, such as calcium carbonate and magnesium hydroxide, away from the electrode 30 in the liquid by returning the electrolytic solution E containing the scale component to the electrolytic cell 6. It precipitates on the surface of Thereby, precipitation of the scale on the cathode K surface can be prevented.

The electrolyzed seawater W flows out from the outlet 16 of the electrolytic cell 6 together with hydrogen gas as the electrolytic solution E, and is stored in the adjustment tank 3 through the second recycle line 12. In the adjustment tank 3, hydrogen gas generated by the electrolytic reaction accumulates on the gas phase side, but the hydrogen gas is discharged after being diluted to below the explosion limit by air supplied to the gas phase.
The stored liquid R including the electrolytic solution E stored in the adjustment tank 3 is introduced into the injection line 13 by the injection pump 17 and then injected into a predetermined place such as a piping of the cooling facility. That is, the electrolytic solution E containing sodium hypochlorite is injected into a predetermined place through the injection line 13 by operating the injection pump 17 pump.

According to the embodiment, by injecting the electrolytic solution E containing sodium hypochlorite into a predetermined place such as a piping of a cooling facility through the injection line 13, it is possible to effectively suppress the attachment of marine organisms. Can do.
Moreover, the nitrogen component contained in the nitrogen containing waste_water | drain discharged | emitted from a plant via the injection line 13 can be removed. That is, the nitrogen component contained in the waste water can be removed by injecting the electrolytic solution E containing sodium hypochlorite into the nitrogen treatment tank in which the nitrogen-containing waste water is stored.

  In addition, the discharge pipe 18 discharges the electrolytic solution E into the adjustment tank 3, thereby generating a swirling flow in the stored liquid R in the adjustment tank 3. Thereby, it can prevent that a scale settles in the bottom part of the adjustment tank 3. FIG. That is, the scale continues to float in the stored liquid R by the swirling flow. Thereby, it becomes difficult for a scale to collect in the bottom part of the adjustment tank 3, the load of scale removal construction is reduced, and maintainability can be improved.

In addition, when the stored liquid R is returned to the electrolytic cell 6, the scale component contained in the stored liquid R is detached along with the scale generated on the surface of the electrode 30. Thereby, accumulation of scale on the surface of the electrode 30 can be prevented. That is, the scale fine particles contained in the storage liquid R returned to the electrolytic cell 6 function as seed crystals, so that electrode deterioration can be moderated.
In addition, an increase in electrolytic voltage (deterioration of power consumption) can be suppressed.
Moreover, the spark by the short circuit of electrodes 30 can be prevented and safety can be improved.

  In addition, the surface of the scale fine particles (seed crystals) floating in the liquid away from the electrode 30 surface, such as calcium carbonate and magnesium hydroxide, which are precipitated when the pH of the electrolytic solution E increases with electrolysis By precipitating at, it is possible to prevent the scale from being deposited on the cathode surface.

  Further, even in the anode A formed by coating titanium with a coating material containing iridium oxide that easily adheres manganese scale during electrolysis, scale growth on the surface of the electrode 30 can be suppressed. .

Further, it is possible to prevent electrode degradation caused by oxidation of pollutants (NH ₃ , COD, etc.) contained in the seawater W by sodium hypochlorite and oxidation of the pollutants by the electrode 30 (anode A). Can do.

  In addition, in the said embodiment, although it was set as the structure by which the electrolyte solution E is discharged by the discharge pipe 18, it does not restrict to this. For example, the seawater W supplied via the seawater supply pump 5 may be discharged by the discharge pipe 18. That is, it is only necessary that a swirl flow can be generated in the stored liquid R stored in the adjustment tank 3.

(Second embodiment)
Hereinafter, the electrolysis system 1B of 2nd embodiment of this invention is demonstrated based on drawing. In the present embodiment, differences from the first embodiment described above will be mainly described, and description of similar parts will be omitted.
As shown in FIG. 4, in the adjustment tank 3 of the electrolysis system 1B of this embodiment, mechanical agitation that mechanically agitates the stored liquid R in the adjustment tank 3 as an alternative to the discharge pipe 18 of the first embodiment. A device 20 is provided. The mechanical stirrer 20 is a prevention means for preventing sedimentation of scale, like the discharge pipe 18.

The mechanical stirring device 20 includes a motor 21 having an output shaft and a screw 22 provided on the output shaft of the motor 21.
By operating the mechanical stirring device 20, the stored liquid R stored in the adjustment tank 3 is forcibly stirred. In other words, scale components (fine particles) and scales contained in the electrolytic solution E stored in the adjustment tank 3 are not precipitated by riding on the flow formed by the mechanical stirring device 20.

  According to the embodiment, the stored liquid R stored in the adjustment tank 3 is forcibly stirred by using the mechanical stirring device 20. Thereby, it can prevent that a scale settles in the bottom part of the adjustment tank 3. FIG.

(Third embodiment)
Hereinafter, an electrolytic system 1C according to a third embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 5, the adjustment tank 3 of the electrolysis system 1C of the present embodiment is provided with a pneumatic stirring device 34 as an alternative to the discharge pipe 18 of the first embodiment. The pneumatic stirrer 34 includes a wall member 36 positioned in the adjustment tank 3 and an air supply unit 35 that supplies air to the stored liquid R.

The wall member 36 is a plate-like member that extends in the vertical direction of the adjustment tank 3 and divides the inside of the adjustment tank 3. The wall member 36 is sized such that a predetermined gap is generated between the lower end of the wall member 36 and the bottom of the adjustment tank 3 and between the upper end of the wall member 36 and the liquid level of the stored liquid R.
The air supply unit 35 is a device that supplies air to the lower part of one space partitioned by the wall member 36. The air supply unit 35 includes a blower (not shown) that pressurizes air to form pressurized air, and a nozzle 37 that supplies the pressurized air to the storage liquid R.

  The nozzle 37 is in the stored liquid R and supplies air to the lower part of one space partitioned by the wall member 36. When pressurized air is supplied through the nozzle 37, one space becomes a rising portion 38 where the air rises from the bottom. The pressurized air rises and escapes from the top. Therefore, there is almost no air in the other space (the descending portion 39). The stored liquid R in the adjustment tank 3 circulates between the ascending part 38 and the descending part 39 due to the difference in density of the stored liquid R between the ascending part 38 and the descending part 39.

According to the above embodiment, the agitation / dispersion effect of the stored liquid R can be obtained by the aeration power of air.
In addition, by increasing the dissolved oxygen (Dissolved Oxygen, DO) concentration using air, the reaction promotes oxidation of manganese ions and silicic acid to manganese dioxide (MnO ₂ ) and silicon dioxide (SiO ₂ ). It is possible to prevent the component from depositing on the surface of the electrode 30 (anode A).

In addition, aeration with air is performed to increase the dissolved carbon dioxide (CO ₃ ²⁺ ) concentration in the electrolytic solution E (for example, pH 8.5), promote the reaction in which calcium ions are precipitated as calcium carbonate, and the scale component is the electrode 30 ( Scale deposition on the cathode K) surface can be prevented.

(Fourth embodiment)
Hereinafter, the electrolysis system 1D of 4th embodiment of this invention is demonstrated based on drawing.
As shown in FIG. 6, between the seawater supply line 4 and the injection line 13 of the electrolysis system 1 </ b> D of this embodiment, the seawater W supplied by the seawater supply pump 5 is directly introduced into the injection line 13. A branch line 41 (backup line) is provided. That is, the electrolysis system 1 of this embodiment can branch directly to the injection line 13 without sending the seawater W flowing through the seawater supply line 4 to the adjustment tank 3.
On the branch line 41, a seawater branch flow rate adjustment valve 42 for adjusting the flow rate of the seawater W flowing through the branch line 41 is provided.

According to the above embodiment, by injecting the seawater W through the branch line 41, the flow rate of the injection line 13 can be increased. Thereby, even when the distance of the injection line 13 is long and the pH of the electrolytic solution changes and the scale is likely to precipitate, the deposition of the scale can be suppressed. That is, scale accumulation due to a decrease in the flow rate of the injection line 13 can be prevented.
The flow rate of the seawater W injected through the branch line 41 can be adjusted as appropriate by operating the seawater branch flow rate adjustment valve 42.

(Fifth embodiment)
Hereinafter, an electrolytic system according to a fifth embodiment of the present invention will be described with reference to the drawings. In the present embodiment, differences from the first embodiment described above will be mainly described, and description of similar parts will be omitted.
As shown in FIG. 7, a columnar structure 24 having a columnar shape extending in the vertical direction is disposed in the center portion viewed from above the adjustment tank 3 of the present embodiment. The columnar structure 24 is disposed so as to be substantially coaxial with the central axis of the bottomed cylindrical adjustment tank 3. It is formed near the center of the swirling flow of the stored liquid R formed by the discharge pipe 18.

According to the said embodiment, it can suppress that a scale lump is formed in the center part of the bottom part 3b of the adjustment tank 3. FIG.
In the electrolysis system of the present embodiment, the columnar structure 24 is installed in order to suppress the formation of a scale lump at the center of the bottom 3b of the adjustment tank 3, but this is not a limitation. For example, an upward convex protrusion may be formed at the center of the bottom 3b of the adjustment tank 3 to suppress the formation of the scale lump.
The shape of the columnar structure 24 is not limited to a cylindrical shape, and may be a prismatic shape. Moreover, it is not necessary to be solid, and a cylindrical shape having a hollow portion inside may be used.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

1, 1B, 1C, 1D Electrolysis system 2 Electrolysis device 3 Adjustment tank 3a Outer peripheral surface 3b Bottom 4 Seawater supply line 5 Seawater supply pump 6 Electrolysis tank 7 DC power supply device 10 Recycle line 11 First recycle line 12 Second recycle line 13 Injection Line 15 Inlet 16 Outlet 17 Infusion pump 18 Discharge pipe (prevention means)
20 Mechanical stirring device (prevention means)
22 Screw 24 Columnar structure 26 Electrode support box 30 Electrode 31 Bipolar electrode plate 32 Anode plate 33 Cathode plate 34 Pneumatic stirrer (prevention means)
35 Air supply part 36 Wall member 37 Nozzle 38 Ascending part 39 Lowering part 41 Branch line 42 Seawater branch flow rate adjusting valve A Anode E Electrolyte K Cathode M Electrode group R Storage liquid W Seawater

Claims (5)

An electrolyzer having an electrolytic cell containing an anode and a cathode as electrodes, and electrolyzing a liquid to be treated;
An adjustment tank that is connected to a seawater supply line for supplying seawater and that temporarily stores the liquid to be processed that has been processed by the electrolyzer;
A first recycling line connecting the adjustment tank and the inlet of the electrolytic cell;
A second recycle line connecting the adjustment tank and the outlet of the electrolytic cell;
A preventive means for preventing precipitation of the precipitated substance in the adjustment tank,
Wherein stored in the adjusting tank, a portion of the reservoir solution containing the precipitated material particles and the fine particles formed by precipitation, to return to the electrolytic cell via the first recycle line,
The prevention means has a discharge pipe for discharging the liquid to be processed through the second recycle line in the stored liquid stored in the adjustment tank,
The electrolytic system according to claim 1, wherein the discharge pipe discharges the stored liquid stored in the adjustment tank in a direction in which a swirling flow is generated . An electrolyzer having an electrolytic cell containing an anode and a cathode as electrodes, and electrolyzing a liquid to be treated;
An adjustment tank that is connected to a seawater supply line for supplying seawater and that temporarily stores the liquid to be processed that has been processed by the electrolyzer;
A first recycling line connecting the adjustment tank and the inlet of the electrolytic cell;
A second recycle line connecting the adjustment tank and the outlet of the electrolytic cell;
A preventive means for preventing precipitation of the precipitated substance in the adjustment tank,
Wherein stored in the adjusting tank, a portion of the reservoir solution containing the precipitated material particles and the fine particles formed by precipitation, to return to the electrolytic cell via the first recycle line,
The prevention means includes a wall member that extends in the vertical direction of the adjustment tank and divides the inside of the adjustment tank into an ascending part and a descending part, an air supply part that supplies air to the lower part of the ascending part, pneumatic stirrer der Ru electrolytic system having a. The anode, electrolyte system according to claim 1 or claim 2 formed by coating titanium with a coating material containing iridium oxide. An electrolyzer having an electrolytic cell containing an anode and a cathode as electrodes, and electrolyzing a liquid to be treated;
An adjustment tank that is connected to a seawater supply line for supplying seawater and that temporarily stores the liquid to be processed that has been processed by the electrolyzer;
A first recycling line connecting the adjustment tank and the inlet of the electrolytic cell;
A second recycle line connecting the adjustment tank and the outlet of the electrolytic cell;
Preventive means for preventing precipitation of precipitated substances in the adjustment tank;
An injection line for supplying a part of the electrolyte from the first recycling line to a predetermined place;
A branch line for branching a part of the seawater of the seawater supply line to the injection line ,
Wherein stored in the adjustment tank, particulates and liquid contained partially, the electrolytic system that and returning to the electrolytic cell via the first recycle line, including the deposition material the fine particles formed by precipitation . The anode, electrolyte system according to claim 4 formed by coating a titanium coating containing iridium oxide.

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