KR20190131915A - On-site production Chlorine generation device producing High-concentrated Sodium Hypochlorite Using the seawater - Google Patents

Abstract

The present invention relates to a field manufacture chlorine generator generating high concentration sodium hypochlorite by using seawater. The present invention comprises: an electrolysis tank in which an electrode unit having a plurality of positive electrode plates and negative electrode plates is provided inside at intervals with a predetermined space from a housing, a frame; a DC rectifier which supplies currents to the electrode unit; an intermediate connection unit which is coupled with and is separated from the electrolysis tank in the upper part and lower part of the electrolysis tank; a seawater supply pipe and a sediment discharge pipe which are connected to a lower intermediate connection unit; and a hydrogen discharge pipe which is connected to an upper intermediate connection unit. The positive electrode plate and the negative electrode plate are arranged to be horizontal to the direction of movement of sea water so that seawater supplied from the lower part of the electrolysis tank and moving to the upper part of the electrolysis tank smoothly passes between the positive electrode plate and the negative electrode plate. In the electrolysis tank, the flow of sea water is repeatedly circulated up and down in a predetermined space to undergo electrolysis while passing through between the positive electrode plate and the negative electrode such that high concentration sodium hypochlorite can be generated due to the effects of hydrogen generation during an electrolysis reaction, seawater flow supplied from the lower side of the electrode unit, and the slow speed and convection of seawater.

Description

On-site production Chlorine generation device producing High-concentrated Sodium Hypochlorite Using the seawater}

The present invention relates to an on-site production chlorine generating device for producing high concentration sodium hypochlorite using seawater, and more particularly, it is repeated while circulating the flow of seawater in an electrolysis tank at a slow flow rate and a low seawater flow rate. The present invention relates to a field production chlorine production device capable of rotating and efficiently generating high concentration sodium hypochlorite using seawater through a cation adhesion induction to a heat exchange tube and a washing tube.

Generally, on-site chlorine growth value is installed in an electrolysis tank at the site where chlorine disinfection is needed, and it is also called sodium hypochlorite generator or sodium hypochlorite generator by electrolysis of salt dissolved in water to produce safe sodium hypochlorite. 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 environmentally protected areas and in populated 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.

When the membrane-free method is applied to the field production chlorine production apparatus, NaCl is electrolyzed into Na ⁺ and Cl ⁻ when an electric current is applied to the electrolysis tank 50 to which the electrolyte salt (NaCl) is supplied. In this case, a reduction reaction occurs at the cathode. Hydrogen (H ₂ ) is generated at the cathode side, and sodium hydroxide (NaOH) is formed from sodium ions (Na ⁺ ) and hydroxide ions (OH ⁻ ), and chlorine (Cl ₂ ) formed at the anode is generated. Sodium hypochlorite (NaOCl) is prepared by reacting with sodium hydroxide produced by the cathode.

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

Currently, on-site chlorine growth is using seawater (saline 2.0 ~ 4.0%) or high-purity artificial saline (more than 98% salinity). The seawater electrolysis system is usually used when cooling water is used as cooling water in thermal and nuclear power plants. It is used to remove fouling organisms attached to cooling water pipes or to sterilize ballast water.

However, on-site chlorine growth growth using seawater is caused by the occurrence of a large amount of cations such as calcium (Ca ²⁺ ) and magnesium ions (Mg ^{2 +} ) in seawater, which is attached to the surface of the cathode during electrolysis. This occurs or interferes with electrolysis, and not only adheres to the cathode surface but also electrically separates and bonds in the electrolysis bath, resulting in large amounts of calcium and magnesium closing the conduit. Accordingly, frequent washing with hydrochloric acid (7 ~ 10%) solution is required, and complex equipment such as hydrochloric acid storage tank, dilution device, and injecting device is also needed.

Therefore, in order to minimize the phenomenon that the calcium and magnesium ions are adhered to the negative electrode and to discharge the precipitated calcium and magnesium from the electrolysis tank, it was configured to pass the electrode plate to the seawater with the highest flow rate and the fastest flow rate. The effective chlorine concentration of sodium hypochlorite produced by passing sea water at such a high flow rate and high flow rate is about 1,000 to 2,000 ppm.

On the other hand, on-site chlorine growth using high-purity artificial brine (more than 98% of salinity) is used by removing the cation hardness in advance by connecting a softener to the incoming water, and since the used brine is made of purified salt, it is often washed with hydrochloric acid. This is unnecessary, and compared to the on-site chlorine production apparatus using seawater, even though a low flow rate and a slow flow rate of brine do not cause hardness problems, it is possible to produce high concentration sodium hypochlorite with an effective chlorine concentration of about 7,000 to 10,000 ppm.

Therefore, in the field production chlorine production apparatus using seawater, the structural improvement of the electrolysis tank is required to produce high concentration sodium hypochlorite with an effective chlorine concentration of about 7,000 to 10,000 ppm, as in the field production chlorine production apparatus using artificial brine.

On the other hand, the Republic of Korea Patent Publication No. 10-1466371 (2014.11.27.) Of the prior art comprises a cylindrical inner tube with both ends open, and a cylindrical outer tube surrounding the inner tube, the outer A plurality of electrolyzers to which a current of the anode is applied to the tube, and a current of the cathode is applied to the inner tube so that the surface area of the anode is larger than the surface area of the cathode; It comprises a curved connector for sequentially connecting both ends of the electrolytic cell; Among the many electrolyzers, an electrolyzer located upstream has a higher electrolytic device having a higher surface area ratio between the anode and the cathode than an electrolyzer located downstream, which is known as a tube type electrolyzer. It is about.

Republic of Korea Patent Publication No. 10-1466371 (2014.11.27., The name of the invention: sodium seawater electrolytic device for the production of high concentration sodium hypochlorite)

The present invention has been made to solve the above problems, an object of the present invention is to repeat the flow of the seawater in the electrolysis tank up and down in the electrolysis tank with a low flow rate of seawater and a small seawater flow rate compared to the conventional seawater electrolysis device Rotate and efficiently generate high concentration of sodium hypochlorite using sea water through the cationic adhesion induction to the heat exchanger tube and the washing tube,

In addition, the seawater flow rate required for electrolysis is lower than that of the conventional seawater electrolysis device, so that the capacity of pipes, pumps, and valves related to the field production chlorine generation device is reduced, thereby reducing the installation area of the site production chlorine production device and making it economical.

In addition, the present invention provides a field production chlorine generating device that can efficiently remove the calcium and magnesium adhering in the electrolysis tank by the heat exchange tube and the washing tube so that no separate hydrochloric acid washing is required.

In order to achieve the above object, the present invention includes an electrolysis tank provided inside the electrode unit having a plurality of positive electrode plates and negative electrode plates spaced apart from the housing and a predetermined space; A direct current rectifier for supplying a current to the electrode unit; An intermediate connection portion coupled to and separated from the electrolysis tank at the upper and lower portions of the electrolysis tank; It consists of a seawater supply pipe and sediment discharge pipe connected to the lower intermediate connection, and a hydrogen discharge pipe connected to the upper intermediate connection, the seawater supplied from the lower part of the electrolysis tank and moving to the upper part of the electrolysis tank passes smoothly between the positive and negative plates. The anode and cathode plates are arranged so as to be horizontal to the movement direction of the seawater, and the seawater in the electrolysis tank is affected by the generation of hydrogen during the electrolysis reaction and the flow of the seawater supplied from the lower side of the electrode, the slow speed and convection of the seawater. The flow of is repeated by repeating the up and down in the predetermined space while passing between the positive electrode plate and the negative electrode electrolysis is characterized in that a high concentration of sodium hypochlorite is produced.

In addition, in the present invention, the inside of the electrolysis tank is an open cell so that atmospheric pressure acts, and the electrolysis tank is configured to increase the capacity by forming an electrolysis tank having the same structure in multiple layers.

In addition, the present invention is a sodium hypochlorite storage tank in which the sodium hypochlorite solution is overflowed and stored through the sodium hypochlorite discharge pipe at the side of the upper intermediate connection, and the precipitate discharge valve installed in the precipitate discharge pipe to remove the collected sediment is added. It consists of.

In addition, in the present invention, the intermediate connection portion is tapered so that the precipitate or hydrogen can be collected well.

In addition, the present invention further comprises a heat exchanger tube spaced apart at a predetermined distance on the side of the electrode in parallel with the positive electrode plate and the negative electrode plate of the electrode in the electrolysis tank, to remove the heat generated during the electrolysis process to the seawater Induced calcium and magnesium ions are adhered to the surface of the heat exchanger tube to reduce the adhesion of calcium and magnesium ions to the negative electrode plate to produce a high concentration of sodium hypochlorite.

In addition, the present invention is a PVC plate is attached to the side of the electrode portion so that the current flowing through the positive electrode plate and the negative electrode plate of the electrode portion does not participate in electrolysis and bypass the heat exchange tube (by bypass), so that the heat exchange area is increased Cooling vanes are formed on the surface of the heat exchanger tube in a ring or thread form.

In addition, the present invention is connected to the external pump (P) and the air or water supplied from the pump is sprayed toward the heat exchange tube or electrode plate from the lower portion of the heat exchange tube or electrode plate through a drilling hole surface of the heat exchange tube or electrode plate The washing tube is installed inside the electrolysis tank so as to be spaced apart from the lower side of the heat exchange tube or the electrode plate so that the calcium and magnesium adhered thereto may be washed when the electrolysis stops.

Field production chlorine growth value to produce a high concentration of sodium hypochlorite using the seawater of the present invention, as described above,

First, compared to the conventional seawater electrolysis device, the seawater flows up and down in the electrolysis tank at a slower flow rate and less seawater flow rate, and rotates repeatedly. To efficiently produce high concentrations of sodium hypochlorite,

Second, since the seawater flow rate required for electrolysis is about one quarter of that of the conventional seawater electrolysis device, the capacity of pipes, pumps, and valves related to the field production chlorine generation device is also reduced, thus reducing the installation area of the site production chlorine production device. Economical,

Third, since it can efficiently remove the calcium and magnesium adhering in the electrolysis tank by the heat exchange tube and the washing tube, there is no need for washing with hydrochloric acid,

Fourth, when the temperature of the sea water is low temperature (below 10 ℃) should be heated so that the coating of the electrode plate is not damaged, the present invention is less required seawater flow rate compared to the conventional seawater electrolysis device and the seawater in the electrolysis tank Since heat is generated by electrolysis at a slow flow rate, the energy consumption for seawater heating is also reduced.

1 is a view showing the entire field production chlorine production device according to the present invention.
Figure 2 is a view showing the whole on-site chlorine production device according to the invention from a direction different from that of FIG.
3 is a view showing an electrolysis tank in the field production chlorine production device according to the present invention.
4 shows the plane of FIG. 3;
5 is a view showing the electrode unit in the field production chlorine production apparatus according to the present invention.
Figure 6 is an additional configuration in the electrolysis tank of the field production chlorine production apparatus according to the present invention.
FIG. 7 is a view showing a cross section when FIG. 6 is provided in an electrolysis tank.

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.

1 is a view showing the whole on-site production chlorine production device according to the present invention, Figure 2 is a view showing the whole on-site production chlorine production device according to the present invention in a different direction from Figure 1, Figure 3 is a site according to the present invention 4 is a view showing an electrolysis tank in the production chlorine production device, FIG. 4 is a view showing a plane of FIG. 3, FIG. 5 is a view showing an electrode portion in the field production chlorine production device according to the present invention, FIG. FIG. 7 is a view showing an additional configuration in the electrolysis tank of the on-site production chlorine generating device, and FIG. 7 is a view showing a cross section when FIG. 6 is provided in the electrolysis tank.

As shown in Figure 1 to 7, below, the configuration and operation of the field production chlorine production device according to the present invention in detail as follows.

First, the present invention, the electrolysis tank 10, sodium hypochlorite storage tank 20, direct current rectifier 30, sea water supply pipe 40, sediment discharge pipe 50, hydrogen discharge pipe 60, heat exchange pipe 70, It consists of a washing tube (80) and the like.

The electrolysis tank 10 is supported by an electrolysis tank support (not shown), and a plurality of electrolysis tanks of the same structure may be provided in a vertical structure.

The plurality of positive electrode plates 11a and the negative electrode plates 11b of the plate-shaped electrode part 11 in the electrolysis tank 10 are spaced apart from the housing 14 which is an electrolysis tank frame with sufficient space. have. The housing 14, which is the electrolytic bath frame, should be a non-conductor, for example, acrylic resin, etc., and the inside of the electrolytic bath 10 is an open cell so that atmospheric pressure acts, and at the side of the upper intermediate connecting portion 16a, The sodium hypochlorite solution flows over the sodium hypochlorite storage tank 20 in the direction to discharge. This is because sodium hypochlorite and hydrogen are simultaneously sucked into the upper side of the housing when the vacuum pressure acts on the electrolysis tank because it is not an open cell.

Here, the plurality of positive electrode plates 11a and the plurality of negative electrode plates 11b are configured to be integrally coupled to the positive electrode plate coupling portion 12a and the negative electrode plate coupling portion 12b, respectively, and the plurality of positive electrode plates 11a and the plurality of negative electrode plates 11b, respectively. Each of the negative electrode plates 11b is stacked in such a manner that they are fitted in such a way as to intersect with each other at regular intervals. The material of the electrode unit is preferably coated with ruthenium on a titanium or titanium plate. In addition, a power supply terminal 13 is configured on the outside of the coupling parts 12a and 12b to be integrally coupled to the positive plate coupling part 12a and the negative plate coupling part 12b, respectively.

Thus, the seawater supplied to the electrolysis tank 10 is electrolyzed while passing between the positive electrode plate 11a and the negative electrode plate 11b. In addition, the electrode portion 11 applied to the present invention is a monopolar having a positive plate coupling portion 12a and a negative plate coupling portion 12b, respectively.

Furthermore, in the case where the plurality of electrolysis tanks 10 having the same structure are installed in a vertical structure, each of the electrolysis tanks has an open top and bottom structure so that the seawater is naturally passed up and down, and the upper electrode portion and the lower electrode portion do not influence each other. It must be sufficiently spaced apart.

As described above, in-situ chlorine growth using conventional seawater minimizes the phenomenon of calcium and magnesium ions adhering to the cathode and discharges the precipitated calcium and magnesium from the electrolysis tank as much as possible with high flow rate and high velocity. Passed through the electrode plate, for this purpose, the space between the housing and the electrode portion, which is the frame of the electrolytic bath, was to be minimized unlike the present invention. Therefore, due to the slow flow rate of seawater, calcium and magnesium ions were prevented from adhering to a specific portion, and seawater bypassing the electrode part without electrolysis was minimized. The effective chlorine concentration of the resulting sodium hypochlorite was about 1,000 to 2,000 ppm.

In the present invention, the power supply terminal 13 of the electrode portion 11 is fixed to the electrolysis tank 10 through the housing 14 which is the electrolysis tank frame and at the same time, the positive and negative poles from the external DC rectifier 30. Is connected to receive current. As described above, the plurality of positive electrode plates 11a and the negative electrode plates 11b of the electrode portion 11 have a sufficient space up, down, left, and right with the housing 14 which is the electrolytic bath frame except for the power supply terminal 13 side. The positive electrode plate 11a is provided so that the seawater supplied from the lower portion of the electrolysis tank 10 which is spaced apart from each other and moved to the upper portion of the electrolysis tank 10 may pass smoothly between the positive electrode plate 11a and the negative electrode plate 11b. And the negative electrode plate 11b are disposed to be horizontal to the moving direction of the seawater.

Upper and lower ends of the electrolysis tank 10 are preferably provided with flanges and / or gaskets 15 for joining and separating with other structures, and the other structure is a double layer of electricity with an additional electrolysis tank 10 of the same structure. It is also possible to increase the capacity of the on-site production chlorine generating device of the present invention by the decomposition tank, and the other structure of the seawater supply pipe 40, sediment discharge pipe 50, sodium hypochlorite discharge pipe in the upper and lower parts of the electrolysis tank 10. 21, the upper intermediate connector 16a and the lower intermediate connector 16b for connecting to the hydrogen discharge pipe 60 and the like. The intermediate connectors 16a and 16b are also preferably provided with flanges and / or gaskets 15 at their ends and tapered so that sediments or hydrogen can be collected.

In addition, the sea water supply pipe 40 is connected to the sea water pump 41 for supplying sea water, the sediment discharge pipe 50 is provided with a sediment discharge valve 51 to remove the collected sediment, the hypochlorous acid The sodium discharge pipe 21 is connected to the sodium hypochlorite storage tank 20 to store sodium hypochlorite, and the stored sodium hypochlorite is used by mixing with a predetermined ratio of water according to the desired chlorine demand at the place of use. Here, when the sediment discharge valve 51 is locked, seawater is not drained through the sediment discharge pipe 50.

Furthermore, since the on-site chlorine growth growth generates heat in the process of electrolyzing seawater in the electrolysis tank 10, the temperature of the sodium hypochlorite produced is higher than the optimal brine temperature of electrolysis, so the effective chlorine concentration is increased. Will cause a drop. In general, the optimal brine temperature of electrolysis can be obtained at the best concentration at 15 ~ 20 ℃, due to the heat generated during the electrolysis process, the temperature of the sodium hypochlorite is usually added 25 ~ 35 ℃ to the brine temperature 40 ~ The temperature rises to about 50 ° C., and as the temperature rises, the effective chlorine concentration decreases, making it impossible to produce high concentration of sodium hypochlorite.

Therefore, the heat of the electrode portion causing the temperature increase of sodium hypochlorite in the electrolysis process is removed by the heat exchange tube 70 in the present invention, if the temperature of the sodium hypochlorite produced at about 27 ~ 30 ℃ high effective chlorine May have a concentration.

In FIGS. 1 to 4, the heat exchange tube 70 is omitted for convenience, and as shown in FIGS. 6 and 7, the heat exchange tube 70 is the positive electrode plate 11a of the electrode part in the electrolysis tank 10. Parallel to the negative electrode plate (11b) is installed on both sides of the electrode portion 11 spaced apart at a certain distance and the water passes through the cooling water. Here, the heat exchange tube 70 is preferably made of titanium, and the current flowing through the positive electrode plate 11a and the negative electrode plate 11b of the electrode portion 11 does not participate in electrolysis, and the heat exchange tube 70 made of titanium is used. The PVC plate 72 is attached to both end portions of the electrode portions 11 so as to serve as an insulating role to prevent bypass. That is, the current is not bypassed to the heat exchange tube 70 by the PVC plate 72 between the both sides of the electrode portion 11 and the heat exchange tube 70.

The heat exchanger tube 70 has a cooling wing 71 formed on the surface of the heat exchanger tube 70 in a ○ -ring shape or a thread shape, so that the heat exchange area is increased so that heat generated during electrolysis at the electrode portion 11 is heat exchanged. Removed by contact with the tube 70 and the cooling blades 71 to maintain the temperature inside the electrolysis tank 10 optimally, so that efficient electrolysis occurs, the heat exchange tube 70 is a housing that is the electrolysis tank frame ( 14 is connected to the external cooler 73, the coolant supply pipe 74 and the coolant discharge pipe 75, and a coolant amount control valve (not shown) may be installed to adjust the amount of coolant. For reference, the housing 14 is omitted in FIG. 6.

Heat generated during electrolysis is removed by the heat exchange tube 70 and the surface of the heat exchange tube is cooled to lower the temperature, and calcium (Ca ^{2 +} ) and magnesium ions (Mg ^{2 +} ) contained in the seawater are kept at a low temperature. Since it is easily crystallized, calcium and magnesium ions are induced to adhere to the surface of the heat exchange tube 70. Accordingly, the phenomenon in which cations such as calcium (Ca ^{2 +} ) and magnesium ions (Mg ^{2 +} ) included in seawater adhere to the surface of the negative electrode during electrolysis is reduced, so that electrolysis proceeds more efficiently.

When the adhesion of calcium and magnesium ions accumulates on the surface of the heat exchange tube 70, the heat exchange efficiency decreases. Thus, a plurality of washing tubes are disposed inside the electrolysis tank to be spaced apart from the electrode 11 and the lower side of the heat exchange tube 70 to prevent this. 80 is installed.

The washing tube 80 may not only wash calcium and magnesium adhered to the heat exchange tube 70, but also wash the calcium and magnesium adhered to the electrode plates 11a and 11b. It is preferable to separately provide a washing tube for washing and a washing tube for washing the electrode plates 11a and 11b.

The washing tube 80 is connected to the external pump (P) to the air or water supplied from the pump through the hole of the washing tube 80 in the lower portion of the heat exchange tube 70 or the electrode plate (11a, 11b) A control valve (not shown) may be provided to spray toward the heat exchange tube 70 or the electrode plates 11a and 11b and adjust the amount thereof. Since the operation of the washing tube 80 during the electrolysis generates oxide by the supply of oxygen, it is preferable to wash the electrolysis at the time of stopping the electrolysis.

Hereinafter, the sodium hypochlorite generation process of the on-site chlorine production device according to the present invention will be described in detail.

First, when seawater is supplied to the electrolysis tank 10 through the seawater supply pipe 40 by the operation of the seawater pump 41, the seawater passes between the positive electrode plate 11a and the negative electrode plate 11b of the electrode portion 11. While electrolysis takes place. Here, the electrode portion 11 applied to the present invention is a monopolar having a positive electrode plate coupling portion 12a and a negative electrode plate coupling portion 12b, respectively, to reduce calcium and magnesium adhered to the electrode plates 11a and 11b. ), The electrolysis tank 10 may have a vertical structure.

In the present invention, the plurality of positive electrode plates 11a and the negative electrode plates 11b of the electrode part 11 in the electrolysis tank 10 are spaced apart from the housing 14 which is the electrolysis tank frame with sufficient space, During the decomposition reaction, the flow of seawater in the electrolysis tank 10 is repeatedly rotated up and down under the influence of hydrogen generation, the seawater flow supplied from the lower side of the electrode unit 11, the slow speed of the seawater, and the convection (FIG. 5). ). Thus, the supplied seawater is repeatedly electrolyzed in the electrolysis tank 10 to pass through between the positive electrode plate 11a and the negative electrode plate 11b, resulting in electrolysis and sodium hypochlorite having a high effective chlorine concentration. This results in the production of high concentration sodium hypochlorite with an effective chlorine concentration of 7,000 to 10,000 ppm with a slow flow rate (about 1/4 of the conventional device) and a low seawater flow rate (about 1/4 of the conventional device). This would be possible.

The heat exchanger tube 70 having the cooling blade 71 formed in a ○ -ring shape or a thread shape on its surface removes heat generated during electrolysis from the electrode portion 11 through a channel of cooling water, thereby causing electrolysis. The temperature inside the bath 10 is optimally maintained for efficient electrolysis.

The sodium hypochlorite solution generated as a result of the electrolysis reaction is overflowed and stored through the sodium hypochlorite discharge pipe 21 into the downward sodium hypochlorite reservoir 20 at the side of the upper intermediate connecting portion 16a, and is discharged and stored. Hydrogen produced as a result of the reaction is led to the hydrogen discharge pipe 60 is discharged.

After stopping the electrolysis, the plurality of washing pipes 80 installed in the electrolysis tank 10 spaced apart from the electrode 11 and the heat exchange tube 70 to the lower side of the air supplied from an external pump P Alternatively, water is directly sprayed from the lower portion of the heat exchange tube 70 or the electrode plates 11a and 11b to wash and remove calcium and magnesium adhering to the heat exchange tube 70 or the electrode plates 11a and 11b.

After the washing of the heat exchanger tube 70 and the electrode plates 11a and 11b is completed, calcium and magnesium, which are precipitated at the lower portion of the lower intermediate connecting portion 16b, are removed by opening the precipitate discharge valve 51.

Accordingly, the present invention is to rotate the seawater flow in the electrolysis tank up and down repeatedly at a slow flow rate of seawater and a small seawater flow rate compared to the conventional seawater electrolysis device, and the cation adhesion induction to the heat exchanger tube and the washing tube Seawater can be used to efficiently produce high concentrations of sodium hypochlorite.

In addition, in the present invention, since the seawater flow rate required for electrolysis is about one quarter of that of the conventional seawater electrolysis device, the capacity of pipes, pumps, and valves related to the on-site production chlorine generation device is reduced, so that the installation of the site production chlorine production device Area is reduced and economical.

In addition, the present invention can efficiently remove the calcium and magnesium adhering in the electrolysis tank by the heat exchange tube and the washing tube does not require a separate hydrochloric acid wash.

In addition, when the temperature of the sea water is low temperature (10 ℃ or less), the seawater supplied to the electrode plate should be heated so as not to be damaged, the present invention is less required seawater flow rate compared to the conventional seawater electrolysis device and the seawater in the electrolysis tank Because of the high rate of heat generated by electrolysis at a slow flow rate, the energy consumption for seawater heating is also reduced.

10: electrolysis tank 11: electrode part
11a: positive electrode plate 11b: negative electrode plate
12a: anode plate coupling portion 12b: negative plate coupling portion
13: power supply terminal 14: housing
15: Flange / gasket 16a: Upper middle connection
16b: lower intermediate connection 20: sodium hypochlorite reservoir
21: sodium hypochlorite discharge pipe 30: direct current rectifier
40: sea water supply pipe 41: sea water pump
50: sediment discharge pipe 51: sediment discharge valve
60: hydrogen discharge tube 70: heat exchanger tube
71: cooling wing 72: PVC plate
73: cooler 74: cooling water supply pipe
75: cooling water discharge pipe 80: washing pipe

Claims (8)

An electrolysis tank 10 provided with an electrode part 11 having a plurality of positive electrode plates 11a and a negative electrode plate 11b spaced apart from the housing 14 which is a frame with a predetermined space therein;
A direct current rectifier (30) for supplying current to the electrode portion (11);
Intermediate connection portions 16a and 16b coupled to and separated from the electrolysis tank at the upper and lower portions of the electrolysis tank 10;
Seawater supply pipe 40 and sediment discharge pipe 50 is connected to the lower intermediate connecting portion 16b, and
Consists of the hydrogen discharge pipe 60 is connected to the upper middle connecting portion (16a),
The positive electrode plate 11a and the negative electrode plate 11b are provided so that the seawater supplied from the lower portion of the electrolysis tank 10 and moved to the upper portion of the electrolysis tank 10 can pass smoothly between the positive electrode plate 11a and the negative electrode plate 11b. It is arranged to be horizontal to the direction of movement of sea water,
During the electrolysis reaction, the flow of seawater in the electrolysis tank 10 is repeated up and down in the predetermined space due to the influence of hydrogen generation, the seawater flow supplied from the lower side of the electrode unit 11, and the slow speed and convection of the seawater. An on-site manufacturing chlorine production apparatus for producing high concentration sodium hypochlorite using seawater, characterized by being electrolyzed while passing between (11a) and the negative electrode plate (11b).
The method of claim 1,
The inside of the electrolysis tank 10 is an open cell so that the atmospheric pressure acts, the electrolysis tank 10 is characterized in that the electrolytic bath 10 of the same structure to increase the capacity by configuring a double layer, Field production chlorine production device that produces high concentration sodium hypochlorite using seawater.
The method of claim 1,
Sodium hypochlorite storage tank 20 in which the sodium hypochlorite solution is discharged and stored through the sodium hypochlorite discharge pipe 21 at the side of the upper intermediate connecting portion 16a,
On-site manufacturing chlorine production apparatus for generating high concentration sodium hypochlorite using seawater, characterized in that the sediment discharge valve 51 is installed in the sediment discharge pipe 50 is further configured to remove the collected sediment.
The method of claim 1,
The intermediate connection portion (16a, 16b) is characterized in that the tapered (taper) shape so that the precipitate or hydrogen can be collected well, on-site manufacturing chlorine production apparatus for producing high concentration sodium hypochlorite using sea water.
The method of claim 1,
In the electrolysis tank 10, the heat exchanger tube 70 is further configured to be spaced apart at a predetermined distance from the side of the electrode portion 11 in parallel with the positive electrode plate 11a and the negative electrode plate 11b of the electrode portion.
Removes heat generated during the electrolysis process and induces calcium and magnesium ions contained in seawater to adhere to the surface of the heat exchanger tube 70, thereby reducing the phenomenon of calcium and magnesium ions adhering to the negative electrode plate 11b. On-site manufacturing chlorine production apparatus for producing high concentration sodium hypochlorite using sea water, characterized in that to produce.
The method of claim 5,
The PVC plate 72 serves as an insulating role to prevent the current flowing through the positive electrode plate 11a and the negative electrode plate 11b of the electrode portion 11 from bypassing the heat exchange tube 70 without being involved in electrolysis. Attached to the side 11 side end portion,
Field production chlorine generating device for producing high concentration sodium hypochlorite using seawater, characterized in that the cooling blade 71 is formed in a ○ -ring form or a thread form on the surface of the heat exchange tube 70 so that the heat exchange area is increased. .
The method of claim 5,
Calcium adhered to the surface of the heat exchange tube 70 by spraying air or water supplied from the pump and connected to an external pump P toward the heat exchange tube 70 from the lower portion of the heat exchange tube 70 through a drilling hole; Generating high concentration sodium hypochlorite using sea water, characterized in that the washing tube 80 is installed inside the electrolysis tank spaced apart to the lower side of the heat exchange tube 70 so that the magnesium can be washed when the electrolysis stops. Field production chlorine production device.
The method of claim 1,
The electrode plates 11a and 11b are connected to an external pump P by spraying air or water supplied from the pump toward the electrode plates 11a and 11b from the lower parts of the electrode plates 11a and 11b through a hole. Using the sea water, characterized in that the washing tube 80 is installed in the electrolysis tank spaced apart to the lower side of the electrode plates (11a, 11b) so that the calcium and magnesium adhered to the electrode can be washed when the electrolysis stops. Field production chlorine production device that produces high concentration sodium hypochlorite.

Images