KR102231413B1 - Sodium Hypochlorite generation device of undivided type including the cooling pipe of titanium material equipped in electrolyzer - Google Patents

Abstract

The present invention relates to a non-diaphragm type sodium hypochlorite generating device including a titanium cooling tube provided in an electrolysis tank, and a process of electrolyzing a titanium cooling tube fixedly installed in a rectangular housing that is an electrolysis tank frame. In order to remove the heat generated from the heat exchange with the cooling water supplied through the cooling water supply pipe, the first spacer plate, which is a non-conductor, is interposed between the electrode part and the cooling pipe, so that the current flowing in the electrode part does not participate in electrolysis and is made of titanium. In order to minimize bypass to the cooling tube, the width of the first separation plate is made wider than the width of the electrode plate and the cooling tube so that the electrode part and the cooling tube are separated from each other, and cooling adjacent to the power supply terminal of the negative electrode Part of the tube has the polarity of the anode, so electrolysis occurs between the electrode part and the cooling tube, so by plating ruthelium (Ru), iridium (Ir) or platinum on the cooling tube having the polarity of the anode, the electrolysis efficiency can be improved. There is an effect of preventing deterioration and preventing perforation of the cooling tube when the cooling tube becomes an anode due to electrolysis between the electrode part and the cooling tube as a current is applied to the cooling tube made of titanium.

Description

{Sodium Hypochlorite generation device of undivided type including the cooling pipe of titanium material equipped in electrolyzer}

The present invention relates to a non-diaphragm type sodium hypochlorite generating device including a titanium cooling tube provided in an electrolysis tank, and more particularly, to bypass the current between the titanium cooling tube and the electrode unit. It is a non-diaphragm type that prevents the decrease in electrolysis efficiency by minimizing it, and prevents perforation of the cooling tube when the cooling tube becomes an anode due to electrolysis between the electrode part and the cooling tube as current is applied to the cooling tube made of titanium. It relates to an apparatus for generating sodium hypochlorite.

[R&D project that supported this invention]
[Task identification number] D202042
[Ministry Name] Gyeonggi-do
[Research Management Agency] Gyeonggi-do Economics and Science Promotion Agency
[Research project name] Corporate-led general
[Research Title] Development of eco-friendly, high-efficiency anti-salt generator to inhibit chlorate formation and improve effective chlorine concentration
[Contribution rate] 1/1
[Host Research Institution] Hiclo
[Research Period] 2020.03.01. ~ 2021.02.28.
In general, field-manufactured chlorine generation equipment is a device that produces safe sodium hypochlorite by installing an electrolysis tank at the site where chlorine disinfection is required and electrolyzing salt dissolved in water, and is also called a sodium hypochlorite generating device. Although chlorine is an effective disinfectant, the transport, storage, and use of lethal toxic chlorine gas are a serious problem for public health and safety. As it is becoming a social problem, the use of chlorine gas in water purification plants is becoming more and more difficult, so it is intended to manufacture and use chlorine in the field.

In addition, there are two types of sodium hypochlorite generators: a diaphragm type and a diaphragm type. In the non-diaphragm type, a positive electrode plate and a negative electrode plate are installed in the electrolysis tank, and there is no diaphragm separating the two plates, and the supplied salt water is electrolyzed to generate chlorine at the positive electrode. Hydrogen gas and hydroxide ions are generated at the cathode, and in the diaphragm method, an ion exchange membrane is installed between the anode and the cathode of the electrolysis tank, and when salt water is supplied to the anode side and water is supplied to the cathode side, chlorine is generated at the anode and sodium ions penetrate the exchange membrane. It moves to the cathode, and hydrogen is generated at the cathode, and hydroxide ions are generated, and sodium hydroxide is generated from sodium ions and hydroxide ions that have moved to the anode.

In addition, when salt is stored in a salt storage tank and dissolved in water, saturated saline that does not dissolve any more over time is produced.In the case of a non-diaphragm type, the saturated saline solution is diluted with water to make 2.8~3.0% diluted saline and supplied to the electrolysis tank. Thus, sodium hypochlorite is produced. In the case of a diaphragm type, saturated brine is supplied to the anode as it is to generate chlorine gas, and sodium hypochlorite is produced by mixing again with sodium hydroxide generated in the cathode. This sodium hypochlorite is a chlorine disinfectant that can be safely used by eliminating the risk of toxic gas.

Looking more closely at the case of applying the non-diaphragm method to such a sodium hypochlorite generating device, NaCl is ^{electrolyzed into Na +} and Cl ^- when an electric current is applied to the electrolysis tank supplied with salt (NaCl) as an electrolyte, and oxidation reaction at the anode. this taking place in the cathode ileonaneunde the reduction cathode side, hydrogen (H ₂₎ is generated and sodium ion (Na ⁺⁾ and hydroxyl ions (OH ^-) a, and a sodium hydroxide (NaOH) is produced, generated at the anode chlorine (Cl ₂₎ Sodium hypochlorite (NaOCl) is produced by reacting with sodium hydroxide produced at the cathode. This sodium hypochlorite (NaOCl) is used as a water purification plant, a sterilizer of a sewage treatment plant, a cooling water boiler of a general chemical plant, a desalination process water, a cooling water treatment of a power plant, a drinking water treatment, plants and vegetables, meat processing, swimming pool and household bleach, etc. It is a chlorine-based disinfectant used.

The main chemical formula is as follows.

(anode)

2Cl ^- → Cl ₂ + 2e

(cathode)

_{2H 2 O + 2e → H 2} + 2OH -

2Na ^{+ +} 2OH ^- → 2NaOH

(Sodium hypochlorite production reaction)

Cl ₂ + 2NaOH → NaOCl + NaCl + H ₂ O

That is, the brine in the brine storage tank is partially diluted by the incoming water from the incoming water supply tank, and the diluted brine is transferred to the electrolysis tank, where the brine component of the diluted brine supplied to the electrolysis tank is 2.8~ It is better to keep it at 3.0%, and when diluted brine containing 2.8-3.0% brine is supplied to the electrolysis tank, it is converted to sodium hypochlorite with an effective chlorine concentration of 7,000-8,000 ppm in the process of passing through the electrode part of the electrolysis tank, and sodium hypochlorite It is discharged to storage tanks or places of use.

On the other hand, the higher the temperature of the sodium hypochlorite that is generated due to generating heat in the electrolytic process in the electrolyzer of oxygen occurs, and the disinfection by-product chlorate to occur (ClO ₃ ^{- -)} and bromate (BrO ₃₎ It causes a decrease in the effective chlorine concentration of sodium hypochlorite. The chlorate (ClO ₃ ^-) and bromate (BrO ₃ ^-), and it is classified as a carcinogen in the disturbance of the human hormones, and can lead to thyroid cancer is a major problem. In addition, bromate is mainly generated when bromine ions are present in small metals used as raw materials. Salt is most distributed in seawater on Earth, and it is recommended to use salt from which bromine ions have been removed in the sodium hypochlorite generator as much as possible. However, even in the salt from which bromine ions have been removed, some bromine ions remain, and the bromine ion concentration varies greatly depending on the type of salt and the time of manufacture.

In addition, although there is a difference in concentration in water obtained from nature, ^{cations such as calcium (Ca 2 +} ) and magnesium ions (Mg ²⁺ ) exist, and the phenomenon of adhesion to the surface of the negative electrode plate occurs during the electrolysis process. As a result, a short circuit occurs or the electrolysis is hindered, and not only adheres to the surface of the negative electrode plate, but also electrically separates and bonds to adhere in the electrolysis tank.

On the other hand, as a prior art, as disclosed in U.S. Patent Publication No. 05273635 (announced on December 28, 1993), there is a structure in which the heat exchanger surrounds the electrode part while installing the heat exchanger in the electrolysis tank. When the heat exchanger is a conductor, a bypass current flows between the heat exchanger made of a conductive material and the electrode part, so that the electrolysis efficiency through the electrode part decreases, and as current is applied to the heat exchanger made of the conductive material, electrolysis occurs between the electrode part and the heat exchanger. When it becomes an anode, there is a problem that the heat exchanger is punctured.

U.S. Patent Publication No. 05273635 (announced on December 28, 1993, title of invention: Electrolytic Heater)

The present invention was conceived to solve the above problems, and an object of the present invention is to remove heat generated in the electrolysis process by providing a cooling tube spaced apart from the electrode part in the electrolysis tank to increase the sodium hypochlorite temperature. While maintaining optimally, high concentration of sodium hypochlorite is produced, and the generation of oxygen is suppressed, so that the formation of chlorate and bromate can be suppressed as much as possible, and cationic substances such as calcium and magnesium ions are adhered to the surface of the negative plate. To prevent,

In addition, the reduction of electrolysis efficiency is prevented by minimizing the current bypass between the titanium material cooling tube and the electrode part, and the electrolysis between the electrode part and the cooling tube as current is applied to the titanium material cooling tube. It is to provide a non-diaphragm type sodium hypochlorite generating device including a cooling tube made of titanium provided in an electrolysis tank to prevent perforation of the cooling tube when the cooling tube becomes an anode.

In order to achieve the above object, in the present invention, the cooling tube made of titanium fixedly installed in the rectangular housing, which is the frame of the electrolysis tank, exchanges heat with the cooling water supplied through the cooling water supply pipe to remove heat generated during the electrolysis process. Part of the cooling pipe adjacent to the power supply terminal of the negative electrode has the polarity of the positive electrode and electrolysis occurs between the electrode part and the cooling pipe, so that the cooling pipe having the polarity of the positive electrode is plated with luteium, iridium, or platinum to cool it. It is characterized in that the pipe is prevented from being perforated due to corrosion.

In addition, in the present invention, the first spacer plate, which is a non-conductor, is interposed between the electrode part and the cooling tube, so that the current flowing in the electrode part does not participate in electrolysis and bypasses the cooling tube made of titanium. The width of the spacer plate is made wider than the width of the electrode plate and the cooling tube so that the electrode part and the cooling tube are separated from each other.

In addition, in the present invention, the cooling pipe is connected to an external cooler, a cooling water supply pipe, and a cooling water discharge pipe through a rectangular housing which is an electrolysis tank frame, and the inlet of the cooling pipe communicates with a cooling water supply pipe for inflow of cooling water, and an S-shaped bent part The S-shaped bend is symmetrical to the left and right so that the outlet of the cooling pipe communicates with the cooling water discharge pipe located on the same side as the cooling water supply pipe while continuing in the longitudinal direction. It has a shape that is symmetrical as well as vertically and includes a plurality of cooling pipes having the above shape in the longitudinal direction of the cooling water supply pipe and the cooling water discharge pipe.

In addition, in the present invention, the cooling pipe, the cooling water supply pipe, and the cooling water discharge pipe form corrugations on the inner and outer surfaces thereof to maximize the heat exchange area.

In addition, in the present invention, while a plurality of the cooling tubes are installed in the longitudinal direction of the rectangular housing, a second spacer is interposed between each cooling tube and the cooling tube to increase resistance to current flow to induce current to flow to the electrode part. The electrode part and the plurality of cooling pipes are separated from each other by first and second spacers, and the second spacer plate is made so that the first spacer plate and the electrode part can pass through and be fixed when installed in the electrolysis tank. 1 A perforation portion identical to the cross-sectional shape of the spacer plate and the electrode portion is formed.

In addition, in the present invention, calcium and magnesium ions contained in the incoming water are induced to adhere to the surface of the cooling pipe to reduce the phenomenon that calcium and magnesium ions are adhered to the negative plate, and the washing pipe is connected to the external pump (P) to By spraying supplied air or water from the bottom of the cooling pipe toward the cooling pipe through the perforated hole, the calcium and magnesium adhered to the surface of the cooling pipe are separated from the lower side of the cooling pipe so that they can be cleaned when electrolysis is stopped. It is installed inside the tank.

As described above, the diaphragm-type sodium hypochlorite generation apparatus including a cooling tube made of titanium material provided in the electrolysis tank of the present invention is provided with a cooling tube spaced apart from the electrode part in the electrolysis tank, which is generated during the electrolysis process. By removing heat, the sodium hypochlorite temperature is maintained optimally, and a high concentration of sodium hypochlorite is produced, and the generation of oxygen is suppressed to suppress the formation of chlorate and bromate as much as possible, as well as calcium and magnesium ions on the surface of the negative plate. There is an effect of preventing the phenomenon of sticking of cationic substances such as the like.

In addition, the present invention minimizes the current bypass between the titanium material cooling tube and the electrode unit to prevent degradation of the electrolysis efficiency, and as the current is applied to the titanium material cooling tube, the electrode unit and the cooling tube When the cooling tube becomes an anode due to electrolysis in the cooling tube, it has the effect of preventing perforation of the cooling tube.

1 is a schematic configuration diagram of a diaphragm-type sodium hypochlorite generating apparatus according to the present invention.
Figure 2 is a perspective view of an electrolysis tank in the diaphragm-type sodium hypochlorite generating device according to the present invention.
3 is a view showing that a plurality of electrolysis tanks are formed in multiple stages in the non-diaphragm type sodium hypochlorite generating apparatus according to the present invention.
Figure 4 is an exploded perspective view of the electrolysis tank in the diaphragm-type sodium hypochlorite generating device according to the present invention.
5 is an enlarged perspective view of an electrode part in an electrolysis tank of the non-diaphragm type sodium hypochlorite generating device according to the present invention.
6 is a view showing the arrangement of only the electrode plate in the electrolysis tank of the diaphragm-type sodium hypochlorite generating device according to the present invention.
7 is an enlarged perspective view of a structure related to a cooling tube made of titanium in the present invention.
8 is an enlarged perspective view of an end of an electrode part in an electrolysis tank of the non-diaphragm type sodium hypochlorite generating device according to the present invention.

A preferred embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings. Note that the accompanying drawings and the description with reference thereto are exemplified so that those of ordinary skill in the art can easily understand the present invention, and are not intended to limit the spirit and scope of the present invention. You will have to do it.

As shown in Figure 1, the diaphragm-type sodium hypochlorite generating apparatus including a cooling tube made of titanium provided in the electrolysis tank according to the present invention, a brine storage tank 1 in which brine is stored, and a brine storage tank 1 ), a salt water supply pipe (2) that supplies saturated salt water from the salt water supply pipe (2), an incoming water supply pipe (3) connected to one side of the salt water supply pipe (2) to supply incoming water, and the saturated salt water diluted in the incoming water supply pipe (3). A dilute saline water supply pipe 12 for supplying the diluted saline water, and an electrolysis tank 10 connected to the dilute saline water supply pipe 12 to electrolyze the diluted saline water supplied through the dilute saline water supply pipe 12 are provided.

A valve and a flow meter may be installed in the brine supply pipe 2 to control the flow rate of saturated salt water, and similarly, a valve and a flow meter may be installed in the incoming water supply pipe 3 to adjust the flow rate of the incoming water. In addition, a sodium hypochlorite discharge pipe 13 for discharging sodium hypochlorite generated by electrolysis is connected to one side of the electrolysis tank 10. When the dilute saline water supply pipe 12 and the sodium hypochlorite discharge pipe 13 pass through the rectangular housing 11 which is an electrolysis tank frame, they are coupled to a gasket for sealing, an O-ring, and the like.

In addition, a temperature sensing unit (not shown) for sensing the temperature of the diluted saline water according to heat generated during electrolysis may be installed at one side of the upper end of the electrolysis tank 10, and the temperature sensed by the temperature sensing unit may be input. A control unit (not shown) for controlling the cooling water to always maintain the temperature inside the electrolysis tank 10 at the set value while appropriately supplying the cooling water according to the result compared to the set value may be further provided.

The brine storage tank (1) dissolves salt used for electrolysis to create saturated saline, and the diluted saline is obtained by diluting the saturated saline to about 2.8 to 3.0%, and a separate tank that stores water for diluting the saturated saline. It may be provided with.

In addition, the electrolysis tank 10 receives the diluted saline solution through the dilute saline solution supply pipe 12 and electrolyzes it to generate sodium hypochlorite. A DC power supply device (not shown) for supplying a DC current for electrolysis is attached to the electrolysis tank 10.

As shown in Figs. 2 to 8, the present invention electrolyzes the dilute saline water inside the electrolysis tank 10 and the heat of the electrode unit 20 in order to remove heat generated in the process of electrolyzing the diluted saline solution. The tank 10 is provided with a plurality of cooling pipes 30 for exchanging heat with the cooling water supplied through the cooling water supply pipe 31 of the cooler 33 installed outside the tank 10.

In other words, since heat is generated during the electrolysis process in the electrolysis tank 10, the temperature of the sodium hypochlorite generated becomes higher than the optimum brine temperature for electrolysis, resulting in a decrease in the effective chlorine concentration. In general, the optimum brine temperature for electrolysis can be obtained at 15 to 20°C. Due to the heat generated in the electrolysis process, the temperature of the sodium hypochlorite generated is usually added to the brine temperature by 25 to 35°C. It is about 50° C., and the effective chlorine concentration decreases as the temperature rises, so that it is impossible to produce a high concentration of sodium hypochlorite.

Therefore, the heat of the electrode part 20 causing an increase in the temperature of sodium hypochlorite in the electrolysis process increases the temperature of sodium hypochlorite generated by removing by the plurality of cooling tubes 30 in the present invention to about 27 to 30°C. If maintained, it can have a high concentration of effective chlorine. In order to continuously circulate the cooling water through the cooling pipe 30, the cooling pipe 30 passes through the closed rectangular housing 11, which is an electrolysis tank frame, and passes through the external cooler 33 and the cooling water supply pipe 31. And it is connected to the cooling water discharge pipe 32, a cooling water amount control valve (not shown), a circulation pump (not shown), and a raw water storage tank for supplying raw water to the cooler 33 to control the amount of cooling water. I can. Accordingly, the cooling water is heat-exchanged while flowing along the plurality of cooling pipes 30 in the electrolysis tank 10. In addition, in order to properly maintain the temperature of sodium hypochlorite, it is desirable to increase the amount of cooling water supplied into the cooling pipe 30 considerably higher than the amount of diluted saline water supplied.

On the other hand, a plurality of positive plates 21a and negative plates 21b of the plate-shaped electrode part 20 in the electrolysis bath 10 are fixedly installed in the rectangular housing 11 which is the frame of the electrolysis bath. , The rectangular housing 11, which is the frame of the electrolysis tank, should be a non-conductor, for example, acrylic resin, and the inside of the electrolysis tank 10 is an open cell so that atmospheric pressure acts, and after the rectangular housing 11 The sodium hypochlorite solution is overflowed from the overflow plate 53 installed at the end and discharged through the sodium hypochlorite discharge pipe 13 to a sodium hypochlorite storage tank (not shown). This is because sodium hypochlorite and hydrogen are simultaneously sucked into the upper side of the housing when vacuum pressure acts in the electrolysis tank 10 because it is not an open cell.

The plurality of positive electrode plates 21a and the plurality of negative electrode plates 21b are configured to be integrally coupled to the positive electrode plate coupling portion 22 and the negative electrode plate coupling portion 23, respectively, and a plurality of positive electrode plates 21a and a plurality of negative electrode plates (21b) Each is stacked in a state of being fitted in a manner that crosses each other while being spaced apart at a predetermined interval. When the length of the electrolysis tank 10 is longer than the length of the electrode plate 21, a support 24 is provided for supporting and fixing the plurality of electrode plates 21 in the longitudinal direction, and each electrode plate is spaced apart from each other. (21) The material of the support 24 is a non-conductor so as not to be energized to each other, and the plurality of support 24 has grooves in which the electrode plates 21 are fitted on both sides as shown in FIG. 5, Between the support 24 and the support 24 in the cross-sectional direction, which is a vertical direction in the longitudinal direction, the electrode plate 21 is in close contact with the support 24 and is spaced apart so as to penetrate, and the positive electrode plate 21a and the negative electrode plate 21b ) Since each is alternately fitted in a manner that crosses each other while being spaced apart from each other at a certain interval, the electrode plate 21 that closely penetrates the support 24 and the support 24 and the electrode plate 21 fitted into the groove of the support 24 The polarity of is different.

Here, the negative electrode plate 21b uses a titanium plate itself, and the positive electrode plate 21a uses a titanium plate plated with ruthelium (Ru), iridium (Ir), or platinum.

In addition, a power supply terminal 40 is provided on the outside of the coupling portions 22 and 23 to be integrally coupled to the positive plate coupling portion 22 and the negative plate coupling portion 23, respectively, to the coupling portions 22 and 23. The connected outermost electrode plate 21 receives current by connecting the positive and negative electrodes from a DC power supply device (not shown) through the power supply terminal 40 and the coupling portions 22 and 23, respectively. Here, the power supply terminal 40 is preferably a titanium-coated copper tube. The power supply terminal 40 is also fixed while being combined with a gasket for sealing, an O-ring, etc. when passing through the rectangular housing 11, which is an electrolysis tank frame.

As described above, the material of the support is a non-conductor so that the electrode plates 21 spaced apart from each other are not energized. However, if water including an electrolyte flowing in the electrolysis tank 10 passes between the electrode plates 21, a plurality of An electrode plate located at the outermost side in the longitudinal direction among the two electrode plates 21 and adjacent to the positive plate or negative plate whose polarity is determined by a DC power supply (not shown) in the longitudinal direction and in the cross-sectional direction perpendicular to the longitudinal direction Another electrode plate 21 adjacent to the electrode plate 21 having the opposite polarity and repeatedly having the opposite polarity is again different from the electrode plate 21 having the opposite polarity. It has the opposite polarity (Fig. 6). As described above in consideration of these characteristics, the cathode plate 21b should be used as the titanium plate itself, and the anode plate 21a should be made of a titanium plate plated with ruthelium (Ru), iridium (Ir), or platinum.

In addition, when the plurality of electrode plates 21 are installed in the rectangular housing 11, which is an electrolysis tank frame, they are installed in a vertical state erected in the longitudinal direction, and spacers ( 50 and 51 are attached, and in particular, the width of the first separation plate 51 at the end of one side of the electrode part 20 adjacent to the cooling pipe 30 among the separation plates 50 and 51 is the electrode plate 21 ) By attaching something wider than the width of the electrode unit 20 to bypass the current flowing through the anode plate 21a and the cathode plate 21b of the electrode unit 20 to the cooling tube 30 made of titanium without being involved in electrolysis. It is to play a role of minimizing. In other words, the first spacer plate 51 is wider than a certain amount on both sides of the electrode plate 21 in the width direction, and its material is a non-conductor such as acrylic, and is interposed between the electrode part 20 and the cooling tube 30. The reduction of electrolysis efficiency is prevented by minimizing that current is diverted to the cooling pipe 30 by the first spacer plate 51. Here, it is preferable that the spacer plate 50 other than the first spacer plate 51 is tightly fixed to the rectangular housing 11 which is an electrolysis tank frame.

That is, the current flows to the side with less resistance. If the cooling tube 30 side has less resistance than the electrode unit 20, the current required for electrolysis flows toward the cooling tube 30, so the electrode unit 20 and the cooling tube (30) are not directly opposed to each other and are separated as much as possible, but the cooling efficiency (removal of heat generated in the electrolysis process) by the cooling tube 30 must also be considered, so there is a need for the above structure in the present invention. will be.

Meanwhile, as described above, the temperature of the sodium hypochlorite generated by removing the heat of the electrode part 20 that causes the temperature increase of sodium hypochlorite during the electrolysis process is maintained at about 27 to 30°C to have a high effective chlorine concentration. As shown in FIG. 7, the cooling pipe 30 is connected in the longitudinal direction while its inlet communicates with the cooling water supply pipe 31 for inflow of cooling water, and the S-shaped bent portion is symmetrical to the left and right, but the cooling water supply pipe ( In order to communicate the outlet to the cooling water discharge pipe 32 located on the same side as 31), the S-shaped bent portion is symmetrical to the left and right and returned in the longitudinal direction, so that the S-shaped bent portion has a shape that is symmetrical vertically as well as left-right symmetrical. A plurality of cooling pipes 30 of this shape are formed in the longitudinal direction of the cooling water supply pipe 31 and the cooling water discharge pipe 32. Here, the cooling pipe 30, the cooling water supply pipe 31, and the cooling water discharge pipe 32 form corrugations on the inner and outer surfaces thereof to maximize the heat exchange area, and the cooling water supply pipe 31 and the cooling water discharge pipe 32 are also electrolyzed. When passing through the rectangular housing 11, which is a jaw frame, it is combined with a gasket for sealing, an O-ring, and the like.

The overall width of the cooling tube 30 is also narrower than the width of the first spacer 51 by a certain amount, so that the current flowing through the positive electrode plate 21a and the negative electrode plate 21b of the electrode unit 20 does not participate in the electrolysis. It is to minimize bypass (bypass) to the cooling pipe (30). A plurality of such cooling pipes 30 are installed in the longitudinal direction of the square-shaped housing 11, which is an electrolysis tank frame, but current through the second spacer plate 52 is also between the cooling pipes 30 and the cooling pipes 30. By increasing the resistance to flow, most of the current is induced to flow to the electrode unit 20. That is, the electrode unit 20 and the plurality of cooling pipes 30 have a structure in which the first and second spacers 51 and 52 are separated from each other.

Using this structure, it was found through experiment that only 0.3 to 1.0% of the current flowing through the electrode unit 20 is bypassed through the cooling tube 30, and some of these currents flow to the cooling tube 30. The material of the cooling tube 30 is made of titanium. In the present invention, a part (about 50%) of the outermost cooling tube 30 close to the power supply terminal 40 of the negative electrode among the plurality of cooling tubes 30 is It has the polarity of the positive electrode and some of the other has the polarity of the negative electrode, and the other adjacent cooling pipes 30 spaced apart from each other with the second spacer 52 interposed therebetween are repeatedly different from the outermost cooling pipe 30 It can be seen that a part (about 50%) of the cooling pipe 30 has the polarity of the positive electrode and the remaining part has the polarity of the negative electrode again. That is, since electrolysis may occur between the electrode unit 20 and the cooling tube 30, in consideration of these characteristics, the cooling tube 30 having the polarity of the positive electrode may be placed in ruthelium (Ru), iridium (Ir), or platinum. By plating to prevent the cooling pipe 30 from being corroded and perforated (FIG. 7).

That is, titanium dioxide (TiO ₂ ) is prevented from accumulating in the cooling tube 30 having the polarity of the anode by such coating, and the titanium dioxide formed by reacting the cooling tube 30 made of titanium and oxygen is a cooling tube ( 30) because it is the main cause of the perforation.

The plurality of second spacers 52 are provided with a first spacer plate 51 and an electrode so that the first spacer plate 51 and the electrode part 20 can be fixed while passing through when installed in the electrolysis tank 10. A perforation portion identical to the cross-sectional shape of the portion 20 is formed, and the second spacer plate 52 is in close contact with the bottom surface of the housing 11 and one side of the housing 11 adjacent to the electrode portion 20, whereas the cooling tube Since one side of the housing 11 adjacent to 30 and the ceiling surface of the housing 11 are separated, salt water is spaced between the second separation plate 52 and one side of the housing 11 adjacent to the cooling pipe 30 Will be bypassed. In addition, the height of the second spacer plate 52 is made higher than the overflow plate 53, which is fixed on the housing 11 on three sides, excluding the ceiling surface, so that the sodium hypochlorite solution does not overflow and flows backward. While preventing it to be discharged through the sodium hypochlorite discharge pipe (13).

As described above, heat generated during electrolysis by the cooling tube 30 is removed, the surface of the cooling tube 30 is cooled to lower the temperature, and calcium (Ca ^{2 +} ) and magnesium ions contained in the incoming water Since (Mg ²⁺ ) is easily crystallized at a low temperature, calcium and magnesium ions are induced to adhere to the surface of the cooling tube 30. ^{Accordingly, a phenomenon in which cations such as calcium (Ca 2 +} ) and magnesium ions (Mg ²⁺ ) contained in the incoming water adhere to the surface of the negative electrode plate 21b during the electrolysis process is reduced, so that the electrolysis proceeds more efficiently. However, if the adhesion of calcium and magnesium ions accumulates on the surface of the cooling tube 30, the heat exchange efficiency decreases. To prevent this, the electrode unit 20 and the cooling tube 30 are separated from each other to the inside of the electrolysis tank 10. A plurality of washing pipes 60 are installed.

The washing pipe 60 is a washing for washing the cooling pipe 30 so that not only calcium and magnesium adhered to the cooling pipe 30 can be washed, but also calcium and magnesium adhered to the negative plate 21b can be washed. It is preferable to separately provide a washing tube 60 for washing the tube 60 and the electrode plate 21.

The washing pipe 60 is connected to an external pump P to feed air or water supplied from the pump through a hole in the washing pipe 60 through a cooling pipe 30 or a cooling pipe under the electrode plate 21. (30) Alternatively, a control valve (not shown) may be installed to inject toward the electrode plate 21 and to control the amount thereof. During electrolysis, the washing pipe 60 is preferably cleaned when the electrolysis is stopped because oxides are generated by the supply of oxygen.

In addition, the non-diaphragm type sodium hypochlorite generating device including a titanium cooling tube provided in the electrolysis tank according to the present invention controls the sodium hypochlorite temperature in a non-diaphragm type open cell method to produce a high concentration of sodium hypochlorite. Generate. Specifically, the inlet 71 and the outlet 72 communicating with the flow path 70 inside the electrolysis tank are provided at upper ends in the longitudinal direction of the rectangular housing 11 which is an electrolysis tank frame, and the housing 11 The flow path 70 is formed and secured in a portion not filled with salt water on the inner upper side of ).

A cooling means (not shown) for reducing the temperature on the flow path 70 is connected to the inlet 71 to supply air from the cooling means, thereby reducing the temperature in the housing 11 to produce high concentration sodium hypochlorite. Keep the temperature around 27~30℃. The cooling means may be a blower or a cooler. In addition, since the air introduced into the flow path 70 guides hydrogen generated from the electrode unit 20 to the outlet 72, the hydrogen gas is separated and treated, so that the stability is high.

That is, the non-diaphragm type sodium hypochlorite generating device including a titanium cooling tube provided in the electrolysis tank according to the present invention is a device in which an air-cooled type (open cell) and a water-cooled type (cooling tube) are used in combination. And the electrolysis tank 10 in the present invention stacks a plurality of electrolysis tanks 10 having the same structure as shown in FIG. 3 and transfers sodium hypochlorite discharged beyond the overflow plate 53 to the sodium hypochlorite discharge pipe. (13) It can be injected into the other electrolysis tank 10 below through the discharge hole communicating with the other electrolysis tank 10 below. Here, in the other electrolysis tank 10, a solution containing sodium hypochlorite is injected through the discharge hole without the dilute saline water supply pipe 12, and electrolysis like the upper electrolysis tank 10 while passing through the electrode unit 20 again. Takes place again.

Hereinafter, the process of generating sodium hypochlorite by the non-diaphragm type sodium hypochlorite generating device including a cooling tube made of titanium provided in the electrolysis tank according to the present invention will be described in detail.

First, saturated brine is supplied through the brine supply pipe 2 and the incoming water is supplied through the incoming water supply pipe 3 connected to the brine supply pipe 2.

As described above, the diluted saline solution diluted with saturated saline by the lead-in water supplied through the lead-in water supply pipe (3) is the electrolysis tank (10) through the diluted saline water supply pipe (12) connected to the front end of the electrolysis tank (10). ), the concentration of diluted saline is supplied at about 2.8-3.0%.

As such, when the diluted saline solution containing 2.8 to 3.0% of the brine component is supplied into the electrolysis tank 10, the electrode unit 20 is passed through the electrode unit 20 composed of the positive electrode plate 21a and the negative electrode plate 21b. The diluted saline solution is electrolyzed by the direct current applied to both sides to generate sodium hypochlorite. At this time, since the first spacer plate 51 is interposed between the electrode part 20 and the cooling tube 30, it is minimized that the current is diverted to the cooling tube 30 by the first spacer plate 51. , Also between each cooling pipe 30 and the cooling pipe, the second spacer plate 52 is interposed to increase the resistance to current flow to induce most of the current to flow to the electrode part 20, while salt water is used as the second spacer plate. It is bypassed to the spaced space between the 52 and one side of the housing 11 adjacent to the cooling pipe 30.

However, since this electrolysis reaction is an exothermic reaction, the effective chlorine concentration decreases as the temperature of sodium hypochlorite increases as described above.

However, in the electrolysis process, the heat of the electrode unit 20 that causes the temperature of sodium hypochlorite to rise is removed by direct heat exchange with the cooling pipe 30 through which the cooling water supplied through the cooling water supply pipe 31 flows. Here, the cooling water after heat exchange is performed is transferred to the cooler 33 through the cooling water discharge pipe 32 and is circulated to the cooling water supply pipe 31 again.

By this heat exchange process, the temperature inside the electrolysis tank 10 can be maintained at an optimum temperature, and accordingly, the generation of oxygen (O ₂ ) due to the temperature increase due to heat generated during electrolysis is prevented in advance. hazardous materials of chlorate (ClO ₃ ^-) and bromate (BrO ₃ ^-) for generating a can only be significantly suppressed as anti FIG phenomenon of cationic substances, such as calcium and magnesium ions is applied to the surface of the negative electrode plate (21b) have. As a result, since the efficiency of electrolysis is greatly improved, high concentration of sodium hypochlorite can be produced.

The generated sodium hypochlorite solution is discharged through the sodium hypochlorite discharge pipe 13 by overflowing the overflow plate 53.

Accordingly, the present invention provides a cooling tube spaced apart from the electrode part in the electrolysis tank to remove heat generated during the electrolysis process to optimally maintain the sodium hypochlorite temperature while producing a high concentration of sodium hypochlorite, and a titanium material. The reduction of electrolysis efficiency is prevented by minimizing the current bypass between the cooling tube and the electrode of the cooling tube. As the current is applied to the cooling tube made of titanium, electrolysis occurs between the electrode and the cooling tube. If this anode is used, it is possible to prevent the cooling pipe from being punctured.

1: brine storage tank 2: brine supply pipe
3: incoming water supply pipe 10: electrolysis tank
11: housing 12: dilute saline water supply pipe
13: sodium hypochlorite discharge pipe 20: electrode part
21: electrode plate 21a: positive plate
21b: negative plate 22: positive plate coupling portion
23: negative plate coupling portion 24: support
30: cooling pipe 31: cooling water supply pipe
32: cooling water discharge pipe 33: cooler
40: power supply terminal 51: first separation plate
52: second separation plate 53: overflow plate
60: washing pipe 70: flow path
71: inlet 72: outlet

Claims (6)

The cooling pipe 30 made of titanium fixedly installed in the rectangular housing 11, which is the frame of the electrolysis tank, exchanges heat with the cooling water supplied through the cooling water supply pipe 31 in order to remove heat generated during the electrolysis process,
A portion of the cooling tube 30 adjacent to the negative power supply terminal 40 has a positive polarity, so that electrolysis occurs between the electrode part 20 and the cooling tube 30, the cooling tube having the positive polarity ( 30) is plated with luteium (Ru) or iridium (Ir) or platinum to prevent the cooling pipe 30 from being corroded and perforated,
The first spacer plate 51, which is a non-conductor, is interposed between the electrode part 20 and the cooling tube 30, so that the current flowing through the electrode part 20 does not participate in the electrolysis, and goes to the cooling tube 30 made of titanium. In order to minimize the bypass, the width of the first spacer plate is made wider than the width of the electrode plate 21 and the cooling tube 30 by a certain amount, so that the electrode part 20 and the cooling tube 30 are separated from each other. ,
The cooling pipe 30 is connected to an external cooler 33, a cooling water supply pipe 31, and a cooling water discharge pipe 32 through a rectangular housing 11 that is an electrolysis tank frame,
The inlet of the cooling pipe 30 communicates with the cooling water supply pipe 31 for inflow of the cooling water, and the S-shaped bent portion is symmetrical to the left and right and extends in the longitudinal direction, but the cooling water discharge pipe 32 located on the same side as the cooling water supply pipe 31 In order to communicate with the outlet of the cooling pipe 30, the S-shaped bent portion is symmetrical left and right and returned in the longitudinal direction, so that the S-shaped bent portion has a shape that is symmetrical vertically as well as left-right symmetrical, and the cooling pipe 30 ) Is composed of a plurality of cooling water supply pipe 31 and the cooling water discharge pipe 32 in the longitudinal direction,
While a plurality of the cooling tubes 30 are installed in the longitudinal direction of the rectangular housing 11, a second spacer 52 is interposed between each cooling tube 30 and the cooling tube 30 to reduce resistance to current flow. It is elevated to induce current to flow to the electrode unit 20, and the electrode unit 20 and the plurality of cooling tubes 30 are separated from each other by the first and second spacers 51 and 52,
When the second spacer plate 52 is installed in the electrolysis tank 10, the first spacer plate 51 and the electrode part ( 20) has the same perforation in the cross-sectional shape,
Induces adhesion of calcium and magnesium ions contained in the incoming water to the surface of the cooling tube 30 to reduce the adhesion of calcium and magnesium ions to the negative electrode plate 21b,
The cooling pipe 30 by spraying air or water supplied from the pump toward the cooling pipe 30 from the bottom of the cooling pipe 30 through a hole in which the washing pipe 60 is connected to an external pump P. Titanium material provided in the electrolysis tank, characterized in that it is installed inside the electrolysis tank 10 by being spaced apart from the lower side of the cooling tube 30 so that the calcium and magnesium adhered to the surface can be cleaned when the electrolysis is stopped. Non-diaphragm type sodium hypochlorite generating device including a cooling tube of.
delete delete The method of claim 1,
The cooling pipe 30, the cooling water supply pipe 31, and the cooling water discharge pipe 32 form a corrugation on the inner and outer surfaces thereof to maximize the heat exchange area. Non-diaphragm type sodium hypochlorite generating device containing.
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