KR102070950B1 - Sodium Hypochlorite generation device of undivided type to maximize efficiency of the heat exchange pipe of titanium material - Google Patents

Abstract

The present invention relates to an apparatus for producing sodium hypochlorite of a diaphragm-free type for maximizing the efficiency of a heat exchange pipe of a titanium material, which comprises: a sodium hypochlorite discharge pipe connected to one side of a housing which is an electrolysis tank frame, and discharging sodium hypochlorite produced by electrolysis; a plate-shaped electrode unit including a plurality of positive and negative plates fixed into the housing; a heat exchange pipe of a titanium material, which is positioned at an upper side of the electrode unit to be spaced apart therefrom, having heat exchange with a cooling fluid supplied through a cooling fluid supply pipe for removing heat generated in an electrolyte process, and fixed into the housing; and a guide plate for extending an insulation plate of an end of both side surfaces of the electrode unit in a longitudinal direction to a lower end of a heat exchange pipe toward the heat exchange pipe. Accordingly, bypass of current between the heat exchange pipe of the titanium material and the electrode unit is minimized to prevent degradation of the efficiency of electrolysis. Also, the heat exchange pipe is positioned at an upper side of the electrode unit, the guide plate extends to the lower end of the heat exchange pipe to allow salt water heated by the electrolysis to intensively pass through the heat exchange pipe, thereby maximizing the efficiency of heat exchange.

Description

Sodium Hypochlorite generation device of undivided type to maximize efficiency of the heat exchange pipe of titanium material}

The present invention relates to a diaphragm-type sodium hypochlorite generating device for maximizing the efficiency of a titanium heat exchanger tube, and more particularly, electrolysis efficiency by minimizing bypass of current between the titanium heat exchanger tube and the electrode portion. To prevent deterioration of the membrane, and place the heat exchanger tube above the electrode and extend the guide plate to the bottom of the heat exchanger tube so that the brine heated by electrolysis is concentrated through the heat exchanger tube to maximize heat exchange efficiency. It relates to a sodium generator.

Generally, on-site chlorine growth value is installed in the field where chlorine disinfection is required, and the device is used to produce safe sodium hypochlorite by electrolyzing salt dissolved in water, also called sodium hypochlorite generating device. Although chlorine is an effective disinfectant, the transport, storage, and use of deadly toxic chlorine gas is a serious problem for public health and safety, especially in transport on complex roads, in environmental protection areas and in populated residential areas. The use of chlorine gas in water purification plants is becoming more and more difficult, so it is for the production and use of chlorine in the field.

In addition, the sodium hypochlorite generating device has a diaphragm type and a diaphragm type. In the diaphragm type, a positive electrode plate and a negative electrode plate are installed in an electrolysis tank, and there is no diaphragm separating the two plates. In the cathode, hydrogen gas and hydroxide ions are generated.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 side and sodium ions penetrate the exchange membrane. It moves to the cathode, and hydrogen is generated at the cathode, and hydroxide ions are generated. 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 brine that is not dissolved any more over time is produced. In the case of a diaphragm type, the saturated brine is diluted with water and made into 2.8-3.0% dilute brine to be supplied to the electrolysis tank. Sodium hypochlorite is produced, and in the case of a diaphragm type, saturated brine is supplied to the anode as it is to generate chlorine gas, and mixed with sodium hydroxide produced at the cathode to produce sodium hypochlorite. Sodium hypochlorite is a chlorine disinfectant that can be safely used to eliminate the danger of toxic gases.

In the case of applying the membrane-free method to the sodium hypochlorite generating device in detail, NaCl is electrolyzed into Na ⁺ and Cl ⁻ when an electric current is applied to an electrolysis tank supplied with electrolyte salt (NaCl), and an oxidation reaction is performed at the anode. In this case, a reduction reaction occurs at the cathode. Hydrogen (H ₂ ) is generated at the cathode side, and sodium hydroxide (NaOH) is generated from sodium ions (Na ⁺ ) and hydroxide ions (OH ⁻ ), and chlorine (Cl ₂ ) generated at the anode is generated. Sodium hypochlorite (NaOCl) is prepared by reacting with sodium hydroxide produced by the cathode. Sodium hypochlorite (NaOCl) is used for water purification plant, sterilizer in sewage treatment plant, cooling water boiler in general chemical plant, desalination process water, cooling water treatment in power plant, drinking water treatment, plants and vegetables, meat processing, swimming pool and household bleach. Chlorine disinfectant used.

The main 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 + ₂ NaOH → NaOCl + NaCl + H ₂ O

That is, the brine in the brine reservoir is partially diluted by the brine in the intake water supply tank, this dilute brine is transferred to the electrolysis tank, where the brine component of the dilute brine supplied to the electrolysis tank is 2.8 ~ It is preferable to maintain 3.0%, and when dilute brine having a salt content of 2.8 to 3.0% is supplied to the electrolysis tank, sodium hypochlorite is converted into sodium hypochlorite having an effective chlorine concentration of 7,000-8,000 ppm in the course of passing through the electrode part of the electrolysis tank. Discharge to a reservoir or place 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 occurs when bromine ions are present in small metals used primarily as raw materials. Salt is most widely distributed in sea water on Earth, and it is recommended to use bromine-ion-free salts in the sodium hypochlorite generator as much as possible. However, even though 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.

Further, the water obtained from natural differences in the concentration, but calcium (Ca ^{2 +)} and magnesium ion (Mg ²⁺⁾ cation is valid, and by the phenomenon that is applied to the negative electrode plate surface in the electrolytic process of generating electrical As a result, a short circuit or an electrolysis may be prevented, and the surface of the negative electrode plate may not only adhere to the surface of the negative electrode plate, but also may be electrically separated and bonded in the electrolysis tank, resulting in a large amount of calcium and magnesium closing the pipe.

On the other hand, as disclosed in the Republic of Korea Patent Publication No. 10-1332608 (announced on November 25, 2013) of the prior art, there is provided a heat exchanger made of titanium, this structure is a heat exchanger and electrode made of titanium metal By-pass current flows between the parts to reduce the electrolytic efficiency through the electrode portion, the electrode portion and the heat exchanger is located in the longitudinal direction sequentially there is a problem that the heat exchange efficiency is also reduced.

Republic of Korea Patent Publication No. 10-1332608 (announced on November 25, 2013, the name of the invention: sodium hypochlorite generator)

The present invention has been made to solve the above problems, an object of the present invention is to minimize the current bypass (bypass) between the heat exchange tube and the electrode portion of the titanium material to prevent a decrease in electrolysis efficiency, the electrode portion Place the heat exchanger tube on the upper side and extend the guide plate to the bottom of the heat exchanger tube to maximize the heat exchange efficiency by intensively passing the heat exchanger tube brine heated by electrolysis,

In addition, by maximizing the heat exchange efficiency, high concentration and high purity sodium hypochlorite with high effective chlorine concentration and low disinfection by-products (chlorate and bromate) is produced, and cationic substances such as calcium and magnesium ions adhere to the surface of the negative electrode plate. In addition to preventing the phenomenon, to provide a separator-free sodium hypochlorite generating device that maximizes the efficiency of the titanium heat exchanger tube to increase the stability by separating the hydrogen generated in the electrode portion separately in an open cell method. have.

In order to achieve the above object, the present invention is a diaphragm-free sodium hypochlorite generating device comprising an electrolysis tank for electrolyzing the dilute saline supplied through the dilute brine supply pipe, one side of the housing which is the electrolysis tank frame A sodium hypochlorite discharge pipe connected to and discharged from the sodium hypochlorite produced by electrolysis; A plate-shaped electrode unit comprising a plurality of positive and negative plates fixedly installed in the housing; Heat exchanger tube made of titanium material and heat exchanged with a cooling fluid supplied through a cooling fluid supply pipe to remove heat generated in the process of electrolysis, which is spaced apart from the upper side of the electrode, and is installed in the housing in the longitudinal direction. It characterized in that it further comprises a guide plate extending to the heat exchanger tube lower end of the insulating plate on both sides of the heat exchanger tube.

In addition, in the present invention, the heat exchange tube is connected to an external cooler or other water source, a cooling fluid supply pipe, and a cooling fluid discharge pipe through a housing which is an electrolysis tank frame, and the titanium heat exchange tube is spaced apart from an upper side of the electrode part. The inlet communicates with the cooling fluid supply pipe for cooling fluid inlet and the outlet of the heat exchange tube communicates with the cooling fluid discharge pipe located opposite the cooling fluid supply pipe in the longitudinal direction of the heat exchange pipe, and the heat exchange pipe is connected to the cooling fluid supply pipe and the cooling fluid discharge pipe. Comprising a plurality of pipes in the longitudinal direction, each of the plurality of pipes formed at the inlet side of the heat exchanger tube adjacent to the longitudinal direction of the cooling fluid supply pipe extending at a predetermined angle extending by the extension of the adjacent tube before and after The length of the heat exchanger tube with 'S' bends symmetrical from side to side at the same position One of the pipes adjacent to the front and rear adjacent to the incline is formed with the 'c' bend at the inlet side of the heat exchanger tube before the formation of the 'S' bend, and the adjacent and adjacent pipes are the cooling fluid supply pipe and the cooling fluid. It is composed of repeated alternately in the longitudinal direction of the discharge pipe, the tube having the 'c' bend first formed on the inlet side of the heat exchanger tube, the 'c' is not formed on the outlet side, 'c' A bend is formed.

In addition, in the present invention, a plurality of heat exchange tubes are installed in the longitudinal direction of the housing, and a current is transferred to the electrode part by increasing resistance to current flow without reducing heat exchange efficiency through a spacer plate, which is a non-conductor, between the heat exchange tube and the heat exchange tube. Induce to flow.

Further, in the present invention, between the support and the support, which is a non-conductor in which grooves are fitted to both sides to support the plurality of positive and negative plates, the electrode plates are spaced apart from each other so that the electrode plates can be in close contact with the support. Each of the and negative plates is alternately fitted in a manner of crossing each other at a predetermined interval.

In addition, the present invention induces the calcium and magnesium ions contained in the incoming water to adhere to the surface of the heat exchanger tube to reduce the phenomenon that the calcium and magnesium ions are adhered to the negative electrode plate, the air supplied from the pump is connected to the external pump (P) Alternatively, water is injected into the electrode plate or the heat exchanger tube from the lower part of the electrode plate through the hole, and the calcium and magnesium adhering to the surface of the heat exchanger tube and the negative electrode plate are spaced apart from the lower side of the electrode unit so as to wash the electrolysis. A cleaning tube is installed inside the digester.

In addition, in the present invention, the cross section of the housing has a rectangular shape, and the inside of the electrolysis tank is an open cell for acting at atmospheric pressure, and a suction port communicating with a flow path that is not filled with saline to reduce the temperature inside the electrolysis tank. And a discharge port are provided at the upper ends of the longitudinal ends of the housing to supply air of the cooling means through the suction port.

The diaphragm-type sodium hypochlorite generating device maximizing the efficiency of the titanium heat exchanger tube of the present invention as described above minimizes the bypass of current between the heat exchanger tube and the electrode portion of the titanium material to prevent a decrease in electrolysis efficiency. In addition, the heat exchanger tube is positioned above the electrode unit, and the guide plate extends to the lower end of the heat exchanger tube, so that the brine heated by electrolysis can be concentrated through the heat exchanger tube to maximize heat exchange efficiency.

In addition, the present invention generates high concentration and high purity sodium hypochlorite with high effective chlorine concentration and low disinfection by-products (chlorate and bromate) through maximization of heat exchange efficiency and at the same time, cationic materials such as calcium and magnesium ions on the surface of the negative electrode plate. This can not only prevent the sticking phenomenon, but also separates the hydrogen generated from the electrode part in an open cell manner to increase stability.

1 is a schematic diagram of a diaphragm-type sodium hypochlorite generating device according to the present invention.
Figure 2 is a perspective view of an electrolysis tank in the diaphragm-free sodium hypochlorite generating device according to the present invention.
Figure 3 is an exploded perspective view of the electrolysis tank in the membrane-free sodium hypochlorite generating device according to the present invention.
4 is a view showing a general flow of brine in the electrolysis bath.
5 is a view showing the flow of brine in the electrolysis tank in the present invention.
Figure 6 is a view showing the flow of brine in the electrolysis tank in the absence of a guide plate in the present invention.
Figure 7 is an enlarged perspective view of the electrode portion in the membrane-free sodium hypochlorite generating device according to the present invention.
8 is a view showing the arrangement of the electrode plate only in the non-diaphragm type sodium hypochlorite generating device according to the present invention.
Figure 9 is an enlarged perspective view of the structure associated with the heat exchange tube in the diaphragm-free sodium hypochlorite generating device according to the present invention.
Figure 10 is an enlarged perspective view of the end of the electrode in the membrane-free sodium hypochlorite generating device according to the present invention.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured as described above are as follows. It is noted that the accompanying drawings and the descriptions thereof are illustrated for easy understanding by those skilled in the art with respect to the present invention, and are not intended to limit the spirit and scope of the present invention. Should.

As shown in FIG. 1, the diaphragm-type sodium hypochlorite generating device for maximizing the efficiency of a titanium heat exchange tube according to the present invention includes a brine storage tank (1) in which brine is stored and a saturated brine from the brine storage tank (1). A brine supply pipe (2) for supplying, a brine supply pipe (3) connected to one side of the brine supply pipe (2) to supply the incoming water, and to supply the saturated brine and dilute brine diluted in the inlet water supply pipe (3) A dilute brine supply pipe 12 and an electrolysis tank 10 connected to the dilute brine supply pipe 12 to electrolyze the dilute saline supplied through the dilute saline supply pipe 12 are provided.

The brine supply pipe (2) may be provided with a valve and a flow meter to adjust the flow rate of saturated brine, and similarly the valve and flow meter may be installed in the intake water supply pipe (3) to adjust the flow rate of the incoming water. And, one side of the electrolysis tank 10 is connected to the sodium hypochlorite discharge pipe 13 for discharging sodium hypochlorite generated by electrolysis. When the diluted brine supply pipe 12 and the sodium hypochlorite discharge pipe 13 penetrate the housing 11 which is the electrolysis tank frame, it is combined with a gasket for sealing, O-ring and the like. In the drawings of the present invention, the cross-sectional shape of the housing 11 is illustrated in a quadrangular shape, but the present invention is not limited thereto, but the glass 11 may be formed in comparison with a conventional circular housing in order to install a heat exchanger tube 30, a spacer plate 52, a gasket, and the like. Therefore, the upper surface can be opened and closed rectangular shape is preferable, and a separate pipe is branched from the inlet water supply pipe (3) and the branched pipe is connected to the cooling fluid supply pipe 31 may be utilized as the cooling fluid.

In addition, a temperature sensing unit (not shown) for detecting the temperature of the dilute saline according to the heat generated during electrolysis may be installed at one side of the upper end of the electrolysis tank 10, and the temperature detected by the temperature sensing unit A control unit (not shown) may be further provided to control the cooling fluid so that the temperature inside the electrolysis tank 10 is always maintained at the set value while appropriately supplying the cooling fluid according to the result compared with the set value. . Here, the cooling fluid may be the same water as the incoming water or low temperature cooling water cooled by a separate cooler (not shown).

The brine storage tank (1) is to dissolve the salt used for electrolysis to make a saturated brine, the diluted brine is diluted to about 2.8 ~ 3.0% of the saturated brine, a separate tank for storing water for diluting the saturated brine It may be provided.

In addition, the electrolysis tank 10 receives the diluted diluted brine is supplied through the dilute brine supply pipe 12 to electrolytic it to produce sodium hypochlorite. The electrolysis tank 10 is attached with a direct current power supply (not shown) for supplying a direct current for electrolysis.

As shown in FIG. 2 to FIG. 10, the present invention cools the dilute brine and the heat of the electrode unit 20 inside the electrolysis tank 10 to remove heat generated during the electrolysis of the dilute saline. A plurality of heat exchange tubes 30 for exchanging heat with the cooling fluid supplied through the supply pipe 31 is provided. As described above, the cooling fluid may be the same water as the incoming water or may be low temperature cooling water cooled by a cooler (not shown) separately installed outside the electrolysis tank 10.

In other words, in the process of electrolysis in the electrolysis tank 10, heat is generated, so that the temperature of the generated sodium hypochlorite becomes higher than the optimal brine temperature of electrolysis, resulting in a decrease in the effective chlorine concentration. In general, the optimum brine temperature of electrolysis can be obtained at the best concentration at 15 ~ 18 ℃, due to the heat generated during the electrolysis process, the temperature of the sodium hypochlorite is usually 18 ~ 20 ℃ added to the brine temperature 34 ~ It becomes about 38 degreeC, and with this temperature rise, the produced | generated sodium hypochlorite re-decomposes and an effective chlorine concentration falls and it becomes impossible to produce | generate a high concentration of sodium hypochlorite.

Therefore, the heat of the electrode portion 20 causing the temperature rise of sodium hypochlorite in the electrolysis process is 15 ~ 20 ℃ (optimum) of the temperature of the sodium hypochlorite generated by the heat exchange tube 30 removed in the present invention If maintained at a temperature similar to the brine temperature of, it can have a high concentration of effective chlorine (more than 10,000ppm). In order to continuously circulate the cooling fluid through the heat exchange tube 30, the heat exchange tube 30 penetrates the closed housing 11, which is an electrolysis tank frame, to form an external cooler (not shown) or another source of water ( It is connected to the cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32, and the cooling fluid flow control valve (not shown), the circulation pump (not shown) and the cooler to control the amount of cooling water A raw water storage tank may be installed to supply the water. The cooling fluid is heat exchanged while flowing along the plurality of heat exchange tubes 30 in the electrolysis tank 10. In addition, in order to properly maintain the temperature of sodium hypochlorite, it is preferable to make the amount of cooling fluid supplied in the heat exchange tube 30 much higher than the amount of dilute saline supplied.

Meanwhile, the plurality of positive electrode plates 21a and the negative electrode plates 21b of the plate-shaped electrode part 20 in the electrolysis tank 10 are fixedly installed in the housing 11 which is an electrolysis tank frame. The housing 11, which is an electrolytic bath frame, should be a non-conductor, for example, an acrylic resin or the like, and the sodium hypochlorite solution is transferred to a sodium hypochlorite storage tank through a sodium hypochlorite discharge pipe 13 installed at the rear end of the housing 11 (not shown). Not discharged).

The electrolysis tank 10 is preferably an open cell having an air flow path 70 in the upper side so that atmospheric pressure acts. Here, if the vacuum pressure in the electrolysis tank 10 is not an open cell, This is because sodium hypochlorite and hydrogen are inhaled upwards and pose a risk. That is, when air is introduced through the air flow path 70 above the housing 11, hydrogen and oxygen generated during electrolysis may be safely processed outside the housing.

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 the plurality of positive electrode plates 21a and the plurality of negative electrode plates, respectively. 21b is laminated | stacked in the state which fitted in the manner which crosses each other, spaced apart at regular intervals. When the length of the electrolysis tank 10 is longer than the length of the electrode plate 21, a support 24 for supporting and fixing the plurality of electrode plates 21 in the longitudinal direction is provided. 21 is a non-conductive material of the support 24 so as not to be energized with each other, the plurality of support 24 is formed with grooves into which the electrode plate 21 is fitted to both sides, as shown in FIG. Between the support 24 and the support 24 in the cross-sectional direction in the vertical direction in the longitudinal direction, the electrode plate 21 is spaced apart enough to penetrate the support 24 and the positive electrode 21a and the negative electrode 21b. ) Are alternately fitted in a manner intersecting each other while being spaced apart at a predetermined interval, so that the electrode plate 21 and the electrode plate 21 fitted into the groove of the support 24 are in close contact with each other between the support 24 and 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 one plated with platinum (Pt), ruthenium (Ru), or iridium (Ir).

In addition, a power supply terminal 40 is provided outside the coupling parts 22 and 23 so as to be integrally coupled to the positive plate coupling part 22 and the negative plate coupling part 23, respectively, to the coupling parts 22 and 23. The outermost electrode plate 21 connected is supplied with a current by connecting a positive electrode and a negative electrode from a DC power supply device (not shown) through the power supply terminal 40 and the coupling parts 22 and 23, respectively. Here, the power supply terminal 40 preferably uses a titanium coated copper tube. When the power supply terminal 40 also penetrates the housing 11 which is the electrolytic bath frame, it is fixed while being coupled with a gasket for sealing and an O-ring.

As described above, the material of the support is an insulator so that the electrode plates 21 spaced apart from each other are not energized with each other. However, when water including electrolyte flowing in the electrolysis tank 10 passes between the electrode plates 21, the plurality of electrodes are separated. An electrode plate positioned at the outermost side in the length direction among the two electrode plates 21 and adjacent to the positive electrode plate or negative electrode plate whose polarity is determined by a DC power supply device (not shown), and the cross-sectional direction perpendicular to the longitudinal direction and 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. 8, a kind of electrostatic induction phenomenon). In consideration of this characteristic, as described above, the negative electrode plate 21b uses a titanium plate itself, and the positive electrode plate 21a should use a plated platinum (Pt), ruthenium (Ru), or iridium (Ir) on the titanium plate. .

On the other hand, the heat exchange tube 30 has to maintain a proper distance from the electrode portion 20 to the upper side, because the resistance to the flow of current so that the electrode portion 20 is less than the heat exchange tube side electrode portion This is to prevent the current flowing through the positive electrode plate 21a and the negative electrode plate 21b of 20 from being bypassed to the heat exchange tube 30 made of titanium without being involved in electrolysis.

When the current is applied to the electrode unit 20 to start the electrolysis of the dilute brine, fine hydrogen bubbles are generated in the electrode unit 20 and rise up. That is, the brine is turned upward by the air lifting (air lifting) effect in which the light hydrogen bubbles rise upward, and the brine rises down both sides of the electrolysis tank 10 and the electrode unit 20, and comes back down to the electrode unit 20. Sodium hypochlorite and heat are generated by electrolysis of the brine through the electrode unit 20 while rotating the inflow to the lower end (see FIG. 4).

In other words, when the plurality of electrode plates 21 are installed in the housing 11 which is an electrolysis tank frame, the plurality of electrode plates 21 are installed in a vertical state standing in the longitudinal direction, and the heat exchange tube 30 is disposed above the electrode unit 20. While positioned, they should be sufficiently spaced apart so that bypass current does not occur. Here, the heat exchange tube 30 should be located above the electrode portion 20 so that the density of the brine heated by electrolysis expands and the density decreases. Rotation of the brine passing through the electrode part 20 by cooling the brine after heat exchange with the brine by the heat exchanger tube 30 located above the electrode part 20 so that the dense brine naturally descends (a type of convection). By increasing the speed, it is advantageous to increase the electrolysis efficiency and heat exchange efficiency.

As described above, the electrolysis at low temperature generates high concentration of sodium hypochlorite and minimizes the occurrence of chlorate (ClO ₃ ⁻ ) and bromate (BrO ₃ ⁻ ), which is why the brine temperature in the electrolysis tank 10 is reduced. Since the high and low make a difference in electrolysis efficiency, the brine repeatedly circulating while passing through the electrode part 20 is electrolyzed in a sufficiently cooled state by the heat exchange tube 30 located above the electrode part 20. In the present invention, it is possible to produce high concentration and high purity sodium hypochlorite with high effective chlorine concentration and low disinfection byproducts (chlorate and bromate).

On the other hand, as described above to maintain the temperature of the sodium hypochlorite produced by removing the heat of the electrode portion 20 causing the temperature rise of sodium hypochlorite in the electrolysis process to have a high concentration of effective chlorine The titanium heat exchanger tube 30 located above the electrode unit 20 to allow the inlet to communicate with the cooling fluid supply pipe 31 for inlet of the cooling fluid, as shown in FIG. The outlet of 30 is in communication with the cooling fluid discharge pipe 32 located on the opposite side of the cooling fluid supply pipe 31 in the longitudinal direction of the heat exchange pipe 30, and the heat exchange pipe 30 is the cooling fluid supply pipe 31 and the cooling fluid discharge pipe. (32) is composed of a plurality of tubes, the tube adjacent to the front and rear in the longitudinal direction of the cooling fluid supply pipe 31 at the inlet side of the heat exchange tube 30 of the plurality of tubes is a constant angle ('S' large in the bent portion) 'Cut 90 to 110 degrees is preferable for the formation, which means that the larger the 'S' is, the surface area in contact with the brine is maximized, but if it is too large, the electrolysis tank is enlarged. One of the tubes adjacent to the front and rear adjacent to each other to form a 'S' bend portion in order to allow each 'S' bend portion formed by the extension of the tube to be symmetrical from side to side at the same position and extend in the longitudinal direction of the heat exchanger tube 30. Before the heat exchange tube 30, the 'c' shaped bend is formed at the inlet side of the heat exchange tube 30, and the above and after adjacent pipes are alternately repeated in the longitudinal direction of the cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32, A tube having a 'c' curved portion first formed at the inlet side of the tube 30 has a 'c' shaped curved portion at the exit side thereof and has a 'c' shaped at another adjacent tube. Ensure that the bend is formed.

In the present invention, the heat exchange tube 30 may be referred to as a structure in which the surface area is maximized for the efficiency of heat exchange, and the heat exchange tube 30, the cooling fluid supply pipe 31, and the cooling fluid discharge pipe 32 are wrinkled on the inner surface thereof. Maximize the heat exchange area by forming a, and the cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32 is also coupled to the gasket for sealing, O-ring, etc. when passing through the housing 11 which is the electrolysis tank frame. In the present invention, the cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32 are shown to penetrate to the side of the housing, but may also penetrate to the upper surface of the housing.

In addition, an insulating plate is attached to both ends of the electrode part 20 in the longitudinal direction to increase the electrolysis efficiency of the brine in the electrolysis tank 10, and the material of the insulating plate is an insulator such as acrylic. Furthermore, as shown in FIG. 5, the present invention preferably includes a guide plate 51 extending from the insulating plate to the heat exchange tube 30 to the bottom of the heat exchange tube 30. As a result of the air lifting effect of light hydrogen bubbles rising upward, the brine heated by electrolysis does not disperse when the brine is turned upward, and most of the brine is concentrated through the heat exchange tube 30. It does not pass through the pipe 30 to prevent the dispersion in the spaced space between the electrode unit 20 and the heat exchanger tube 30 above the electrode unit to maximize the heat exchange efficiency of the brine. Without the guide plate 51, as shown in FIG. 6, a substantial amount of the heated brine does not pass through the heat exchange tube 30, and thus the uncooled brine flows back to the lower end of the electrode unit 20.

In the present invention, the heat exchange tube 30 has a plurality of units (one unit having one cooling fluid supply pipe and one cooling fluid discharge pipe in the heat exchanger tube in the longitudinal direction of the housing 11 which is an electrolysis tank frame). The cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32 of each of the heat exchange tubes 30 are connected in parallel with one cooler or one water supply source of the same outside, and the heat exchange tubes 30 are electrically In the digestion tank 10, if only one is installed in the longitudinal direction of the housing 11 above the electrode unit 20, the cooling fluid and the electrolysis tank 10 in the heat exchange tube 30 close to the cooling fluid supply pipe 31 are provided. The heat exchange efficiency is good because the temperature difference of the brine is great, but the temperature of the cooling fluid in the heat exchange tube 30 rises toward the cooling fluid discharge tube 32, so that the heat exchange efficiency is lowered, and the current flows toward the less resistance heat exchange tube 30 This is long As the resistance to the flow of current decreases, the current required for electrolysis flows toward the heat exchange tube 30. Therefore, in order to prevent the occurrence of the bypass current, the distance between the heat exchange tube 30 and the electrode unit 20 is increased. Thereby, there is a problem that the size of the electrolysis tank 10 becomes large, and it is preferable to provide a plurality of heat exchange tubes 30.

As described above, even when a plurality of heat exchange tubes 30 are installed, the separation distance between the heat exchange tubes 30 is so close that the resistance to the flow of current between the heat exchange tubes 30 decreases, so that the bypass current becomes smaller than the electrode portion 20. Since the distance between the heat exchange tubes 30 should be sufficiently spaced apart from each other, as the distance between the heat exchange tubes 30 increases, the space where heat exchange cannot be performed in the electrolysis tank 10 increases, thereby reducing heat exchange efficiency. Accordingly, the heat exchange efficiency is reduced between the heat exchanger tube 30 and the heat exchanger tube 30 and between the outermost heat exchanger tube 30 and the housing 11 among the plurality of heat exchanger tubes 30 through a spacer plate 52 which is a non-conductor. It does not increase the resistance to the current flow to induce the current to flow mostly to the electrode portion (20). In order to prevent the occurrence of the bypass current, the electrode unit 20 and the heat exchanger tube 30 are separated as much as possible, and the heat exchange efficiency by the heat exchanger tube 30 (elimination of heat generated in the process of electrolysis) should also be considered. There is a need for such a structure in the above.

Here, the spacer plate 52 is formed with the same perforation as the cross-sectional shape of the electrode portion 20 so that the electrode portion 20 can be fixed while penetrating in the electrolysis tank 10 and the washing tube 60 to be described later ) Is installed in the spacer plate 52 is formed with the same perforated part as the cross-sectional shape of the washing tube 60, the spacer plate 52 is in close contact with the bottom surface and the side of the housing 11 and electrolysis in the present invention Since the tank 10 is an open cell structure, it is spaced apart from the ceiling surface of the housing 11, and the upper end of the spacer plate 52 is higher than the brine level.

, Was to remove the heat generated during electrolysis by the heat exchange pipe 30 and the temperature is low, the heat exchange tube (30) surface is cooled, the calcium contained in the incoming number, as described above (Ca ^{2 +)} and magnesium ions (Mg ^{+ 2)} is derived such that the calcium and magnesium ions is applied to the heat exchange tube (30) surface is easily crystallized at low temperature. Thus the calcium contained in the incoming number (Ca ^{2 +)} and magnesium ion (Mg ^2+), etc. The cation is reduced phenomenon is applied to the negative electrode plate (21b) surface in the electrolytic process, the electrolysis is to be conducted more efficiently. However, when the adhesion of calcium and magnesium ions accumulates on the surface of the heat exchange tube 30, the heat exchange efficiency decreases, so that the plurality of cleaning tubes 60 are spaced apart from the lower side of the electrode unit 20 to prevent this. ) Is installed.

The washing tube 60 is connected to the external pump (P) to the air or water supplied from the pump heat exchange tube 30 or the electrode plate in the lower portion of the electrode plate 21 through the drilling hole of the washing tube 60 A control valve (not shown) may be installed to spray toward 21 and adjust the amount thereof. Since the operation of the washing tube 60 during the electrolysis is generated by the supply of oxygen, it is preferable to wash the electrolysis when stopped.

The washing tube 60 may not only wash calcium and magnesium adhered to the heat exchange tube 30, but also wash calcium and magnesium adhered to the negative electrode plate 21b, and the washing tube 60 and the heat exchange tube Even if the electrode portion 20 is interposed between the 30, the spraying force can be sufficiently applied to the heat exchanger tube 30 by the operation of the pump.

In addition, the present invention controls the sodium hypochlorite temperature in a non-diaphragm open cell manner to produce a high concentration of sodium hypochlorite. Specifically, the inlet port 71 and the outlet port 72 communicated with the flow path 70 inside the electrolysis tank 10 are provided at the upper ends of the longitudinal direction of the housing 11 which is the electrolysis tank frame, the housing ( 11) the flow path 70 is secured to a portion not filled with brine on the inside of the upper portion.

Cooling means (not shown) for reducing the temperature on the flow path 70 is connected to the inlet port 71 to supply air of the cooling means to adjust the temperature in the housing 11 to produce high concentration sodium hypochlorite. The temperature is maintained at about 15 to 18 ° C. The cooling means may be a blower, a cooler or the like. In addition, the air introduced into the flow path 70 is high in stability because the hydrogen gas is separated and processed by inducing hydrogen generated in the electrode unit 20 to the discharge port 72. That is, this invention is an apparatus which used air-cooled (open cell) and water-cooled (heat exchange tube) together.

In the present invention, when the housing has a rectangular shape and the upper surface is openable, the watertightness is inferior to that of the circular housing, but in the case of the open cell method, since the salt water does not rise to the upper surface of the housing, the watertightness of the upper surface is not important and the electrolysis tank 10 The inside of the housing 11 is always maintained at atmospheric pressure, thereby minimizing leakage at the penetrating portion between the upper and side surfaces of the housing 11 or between the inside and the outside of the electrolysis tank 10.

Hereinafter, the sodium hypochlorite generation process of the membrane-free sodium hypochlorite generating device maximizing the efficiency of the titanium heat exchanger tube 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 inlet water supply pipe (3) connected to the brine supply pipe (2).

As described above, the dilute brine in which the saturated saline is diluted by the inlet water supplied through the inlet water supply pipe 3 is electrolyzed through the dilute salt water supply pipe 12 connected to the front end of the electrolysis tank 10. ), And the concentration of dilute saline is supplied at about 2.8-3.0%.

In this way, when the dilute saline solution having a brine component of 2.8 to 3.0% is supplied into the electrolysis tank 10, the electrode unit 20 in the process of passing through the electrode unit 20 composed of the positive electrode plate 21a and the negative electrode plate 21b. Dilute brine is electrolyzed by direct current applied to both sides to produce sodium hypochlorite. At this time, the heat exchange efficiency is reduced between the heat exchanger tube 30 and the heat exchanger tube 30 and between the outermost heat exchanger tube 30 and the housing 11 among the plurality of heat exchanger tubes 30 through a spacer plate 52 which is a non-conducting member. It does not increase the resistance to the current flow to induce the current to flow mostly to the electrode portion (20).

However, since the electrolytic reaction is an exothermic reaction, the effective chlorine concentration decreases as the temperature of sodium hypochlorite increases. However, the heat of the electrode portion 20 causing the temperature rise of sodium hypochlorite in the electrolysis process is removed by direct heat exchange with the heat exchange tube 30 through which the cooling fluid supplied through the cooling fluid supply pipe 31 flows. do. Here, the heat exchange tube 30 has the structure or shape as described above (maximum 9) in order to maximize the heat exchange efficiency, the cooling fluid after the heat exchange is through the cooling fluid discharge pipe 32 to the cooler or other water supply source It is passed and then circulated to the cooling fluid supply pipe (31). In addition, an air-cooled cooling method using an open cell is applied, and the guide plate 51 extending the insulating plate to the heat exchange tube to the bottom of the heat exchange tube has an electrode portion 20 without passing salt water heated by electrolysis through the heat exchange tube 30. ) To maximize the heat exchange efficiency of the brine by blocking the dispersion in the spaced space between the heat exchanger tube 30 on the upper side of the electrode unit.

By such a heat exchange process, the temperature inside the electrolysis tank 10 can maintain the optimum temperature, thereby preventing in advance the generation of oxygen (O ₂ ) due to the temperature rise due to heat generated during electrolysis. 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 sodium hypochlorite solution thus produced is discharged in a natural flow manner through the sodium hypochlorite discharge pipe 13 in the case of an open cell.

Accordingly, the present invention minimizes the bypass of current between the heat exchange tube and the electrode portion of the titanium material to prevent the degradation of the electrolysis efficiency, the heat exchange tube is located above the electrode portion and the guide plate extends to the bottom of the heat exchange tube By maximizing heat exchange efficiency, the concentrated brine heated by electrolysis passes through the heat exchange tube, and by maximizing such heat exchange efficiency, high chlorine concentration and high disinfection byproducts (chlorate, bromate) Produces sodium hypochlorite.

1: salt water storage tank 2: salt water supply pipe
3: incoming water supply pipe 10: electrolysis tank
11: housing 12: diluted brine supply pipe
13: sodium hypochlorite discharge pipe 20: electrode
21: electrode plate 21a: positive electrode plate
21b: negative electrode plate 22: positive electrode plate coupling portion
23: negative plate coupling portion 24: support
30: heat exchange tube 31: cooling fluid supply pipe
32: cooling fluid discharge pipe 40: power supply terminal
51: guide plate 52: spacer plate
60: washing tube 70: flow path
71: inlet port 72: outlet port

Claims (6)

In the diaphragm-type sodium hypochlorite generating device comprising an electrolysis tank 10 for electrolyzing the dilute saline supplied through the dilute saline supply pipe 12,
A sodium hypochlorite discharge pipe 13 connected to one side of the housing 11 that is a frame of the electrolysis tank 10 and discharging sodium hypochlorite generated by electrolysis;
A plate-shaped electrode part 20 including a plurality of positive electrode plates 21a and a negative electrode plate 21b fixedly installed in the housing 11;
Titanium material which is spaced apart from the upper side of the electrode unit 20 and heat exchanged with the cooling fluid supplied through the cooling fluid supply pipe 31 to remove heat generated during the electrolysis process and is fixed in the housing 11. Heat exchanger tube 30, and
The efficiency of the titanium heat exchanger tube, characterized in that it further comprises a guide plate 51 which extends the insulating plate at both ends of the longitudinal direction of the electrode portion 20 to the heat exchanger tube 30 to the lower end of the heat exchanger tube 30. A diaphragm-type sodium hypochlorite generator to maximize the.
The method of claim 1,
The heat exchange tube 30 is connected to an external cooler or other water supply source with a cooling fluid supply pipe 31 and a cooling fluid discharge pipe 32 through a housing 11 which is an electrolysis tank frame.
The titanium heat exchanger tube 30 spaced apart from the upper side of the electrode unit 20 has an inlet communicating with a cooling fluid supply pipe 31 for introducing a cooling fluid, and an outlet of the heat exchanger tube 30 has a heat exchanger tube 30. In communication with the cooling fluid discharge pipe 32 located on the opposite side of the cooling fluid supply pipe 31 in the longitudinal direction of the heat exchange tube 30 is a plurality of pipes in the longitudinal direction of the cooling fluid supply pipe 31 and the cooling fluid discharge pipe (32). Consisting of the plurality of pipes are formed by the extension of the adjacent adjacent tube extending at a predetermined angle in the longitudinal direction of the cooling fluid supply pipe 31 at the inlet side of the heat exchange tube 30 extending at a predetermined angle. One of the tubes adjacent to the front and rear adjacent to the 'S' bend portion in order to continue in the longitudinal direction of the heat exchange tube 30 while the 'S' bend portion is symmetrical from side to side at the same position, the inlet side of the heat exchange tube 30 before the formation of the 'S' bend portion On ''Casted bent portion is formed first, and the adjacent adjacent back and forth pipes are alternately repeated in the longitudinal direction of the cooling fluid supply pipe 31 and the cooling fluid discharge pipe 32, the letter' c 'on the inlet side of the heat exchange tube (30) The tube in which the bend is formed first has a 'c' bend at its exit side, and the 'c' bend is formed at another adjacent tube. Sodium hypochlorite generator.
The method of claim 1,
The heat exchange tube 30 is provided in plural in the longitudinal direction of the housing 11, and the current is exchanged between the heat exchange tube 30 and the heat exchange tube 30 via a spacer plate 52, which is a non-conductor, without reducing the heat exchange efficiency. A diaphragm-type sodium hypochlorite generator for maximizing the efficiency of a titanium heat exchanger tube, characterized in that to induce a current to flow to the electrode portion 20 by increasing the resistance to flow.
The method of claim 1,
In order to support and fix the plurality of positive electrode plates 21a and the negative electrode plate 21b, an electrode plate 21 is formed between the supporter 24 and the supporter 24, which are non-conductors having grooves into which the electrode plate 21 is fitted. Closely spaced enough to penetrate the support 24, each of the positive electrode plate (21a) and the negative electrode plate (21b) is spaced apart at regular intervals, characterized in that they are alternately fitted in a way that intersect each other, A diaphragm-type sodium hypochlorite generator that maximizes efficiency.
The method of claim 1,
Induce calcium and magnesium ions contained in the incoming water to adhere to the surface of the heat exchange tube 30 to reduce the phenomenon that the calcium and magnesium ions adhere to the negative electrode plate 21b,
The heat exchanger tube 30 is connected to an external pump P by spraying air or water supplied from the pump toward the electrode plate 21 or the heat exchanger tube 30 from the lower portion of the electrode plate 21 through a hole. And a washing tube 60 is installed inside the electrolysis tank 10 so as to be spaced apart from the lower side of the electrode part 21 so that the calcium and magnesium adhered to the surface of the negative electrode plate 21b can be washed when the electrolysis is stopped. A diaphragm-type sodium hypochlorite generator that maximizes the efficiency of a titanium heat exchanger tube.
The method of claim 1,
The cross section of the housing 11 has a quadrangular shape, the inside of the electrolysis tank 10 is an open cell so that atmospheric pressure acts, and the flow passage 70 is a portion not filled with saline to reduce the temperature inside the electrolysis tank. The inlet 71 and the outlet 72 in communication with the upper end of the longitudinal direction of the housing 11 is provided to supply the air of the cooling means through the inlet 71, A diaphragm-type sodium hypochlorite generator that maximizes efficiency.

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