KR20240020315A - A desalination system for continuous operation and improving of desalination efficiency - Google Patents

Abstract

The present invention connects a storage tank in which the dilution target liquid, which is a desalination target, and a storage tank in which the concentrated liquid is stored, to a desalination/concentrator where desalination is performed, so that the ion concentration of the dilution target liquid stored in the storage tank is constant through the desalting process. It has the effect of quickly lowering the concentration to a certain level, and during the desalination process, the ion concentration of the concentrated liquid stored in the storage tank is maintained at a constant concentration so that the ion concentration of the concentrated liquid does not rise above a certain level, thereby preventing desalination efficiency from decreasing. This invention provides a preventive effect, and is characterized by comprising a diluent tank 100, a concentrate tank 200, a dilution/concentration unit 300, and a concentrate concentration maintenance unit 400.

Description

A desalination system that enables continuous operation and prevents desalination efficiency from decreasing {A desalination system for continuous operation and improving of desalination efficiency}

The present invention relates to a desalination system that is capable of continuous operation and prevents deterioration in desalination efficiency. Specifically, the present invention relates to a desalination/concentration system in which desalination is performed using a storage tank storing a diluted liquid to be desalinated and a storage tank storing a concentrated liquid to be desalinated. Connected to the unit, the ion concentration of the diluted solution stored in the storage tank is lowered to a certain concentration through the desalting process, and during the desalting process, the ion concentration of the concentrated solution stored in the storage tank is kept from rising above a certain level. This is a technology for a desalination system that maintains the ion concentration at a constant level to enable continuous operation and prevent desalination efficiency from deteriorating.

In modern society, with the development of industry and technology, various types of industrial raw materials are produced in production plants or used in industrial sites. In particular, in the case of liquid raw materials, they are initially produced at a very high concentration in a production plant, and then the concentration is adjusted to a low concentration that can be used in industrial sites, and then commercialized and supplied to production sites. In certain industrial sites, high-concentration liquid raw materials are used. It is used by lowering the concentration to a specific concentration.

In general, in order to lower the concentration of high-concentration liquid raw materials, the conventional desalination system connects the storage tank in which the diluted target liquid, which is the desalination target, and the storage tank in which the concentrated target liquid is stored, to the process equipment where desalination is performed, and performs the desalination process. The concentration of the diluted solution stored in the storage tank was lowered to a certain concentration.

However, in the case of a conventional desalination system, during the desalination process, if the concentration of the concentrated liquid stored in the storage tank rises above a certain level (higher than the concentration of the diluted liquid stored in the storage tank), the desalination efficiency drops rapidly. There was.

Therefore, the present invention is intended to solve the problems of the prior art, and connects a storage tank in which the dilution target liquid, which is to be desalted, is stored and a storage tank in which the concentrated liquid is stored, to a desalting/concentration unit where desalting is performed, and storage is performed through a desalting process. The ion concentration of the diluted solution stored in the tank is lowered to a certain concentration, and during the desalting process, the ion concentration of the concentrated solution stored in the storage tank is maintained at a constant concentration so that the ion concentration of the concentrated solution stored in the storage tank does not rise above a certain level. We would like to propose a technology for a desalination system that is operable and does not deteriorate desalination efficiency. The following are related prior arts.

1. Republic of Korea Patent Publication No. 10-0561103 Method for reducing salt in liver by electrodialysis 2. Republic of Korea Patent Publication No. 10-0666309 Condensate desalination device and method using electric purification device 3. Republic of Korea Patent Publication No. 10-1063926 Condensate desalting system and condensate desalting method

The present invention connects a storage tank in which the dilution target liquid, which is a desalination target, and a storage tank in which the concentrated liquid is stored, to a desalination/concentrator where desalination is performed, so that the ion concentration of the dilution target liquid stored in the storage tank is constant through the desalting process. The purpose is to lower the concentration.

In addition, the purpose of the present invention is to maintain the ion concentration of the concentrated liquid stored in a storage tank at a constant concentration so that the ion concentration of the concentrated liquid stored in the storage tank does not rise above a certain level during the desalting process.

In order to achieve the above object, the present invention provides a desalination system that enables continuous operation and prevents deterioration in desalination efficiency,

a diluent tank 100 that stores a diluted solution whose ion concentration is lowered depending on the operation of the system;

a concentrated liquid tank 200 that stores a concentrated liquid whose ion concentration increases as the system operates;

Through the desalting process, the ion concentration of the diluted liquid supplied from the diluent tank 100 is lowered and re-supplied to the diluted liquid tank 100, and through the concentration process, the ion concentration of the concentrated liquid supplied from the concentrated liquid tank 200 is increased. A dilution/concentration unit (300) that re-supplies the concentrate tank (200);

To prevent desalination efficiency of the dilution/concentration unit 300 from being reduced, when the ion concentration of the concentrated solution stored in the concentrate tank 200 reaches the target concentration, the ion concentration of the concentrated solution stored in the concentrate tank 200 is adjusted to the target concentration. It is characterized by including a concentrate concentration maintenance unit 400 that maintains the concentration constant.

The present invention connects a storage tank in which the dilution target liquid, which is a desalination target, and a storage tank in which the concentrated liquid is stored, to a desalination/concentrator where desalination is performed, so that the ion concentration of the dilution target liquid stored in the storage tank is constant through the desalting process. It provides the effect of quickly lowering the concentration.

In addition, the present invention maintains the ion concentration of the concentrated liquid stored in the storage tank at a constant concentration so that the ion concentration of the concentrated liquid stored in the storage tank does not rise above a certain level during the desalination process, thereby enabling continuous operation and improving desalination efficiency. Provides the effect of preventing deterioration.

1 is an overall configuration diagram of the present invention
Figure 2 is a detailed configuration diagram of the dilution/concentration unit of the present invention
Figure 3 is an illustration of the desalting process through the dilution/concentration unit of the present invention.
Figure 4 is a detailed configuration diagram of the concentrate concentration maintenance unit of the present invention
Figure 5 is a first control example of the concentrate concentration maintenance unit of the present invention
Figure 6 is a second control example of the concentrate concentration maintenance unit of the present invention

Embodiments of the present invention will be described in detail with reference to the attached drawings.

The present invention's desalination system (10, hereinafter referred to as the present invention), which is capable of continuous operation and prevents deterioration in desalination efficiency, is a desalination/concentration system in which desalination is performed by combining a storage tank in which the diluted liquid to be desalted is stored and a storage tank in which the concentrated liquid to be concentrated is stored. It has the effect of quickly lowering the ion concentration of the diluted solution stored in the storage tank to a certain concentration through the desalination process by connecting it to the This invention ensures that the ion concentration of the solution to be concentrated is maintained at a constant concentration, enabling continuous operation and preventing desalination efficiency from decreasing. The invention includes a diluent tank (100), a concentrate tank (200), and a dilution/concentration unit. (300), and is characterized in that it includes a concentrate concentration maintenance unit (400).

Specifically, the desalination system of the present invention capable of continuous operation and preventing deterioration in desalination efficiency is, as shown in FIG. 1,

a diluent tank 100 that stores a diluted solution whose ion concentration is lowered depending on the operation of the system;

a concentrated liquid tank 200 that stores a concentrated liquid whose ion concentration increases as the system operates;

Through the desalting process, the ion concentration of the diluted liquid supplied from the diluent tank 100 is lowered and re-supplied to the diluted liquid tank 100, and through the concentration process, the ion concentration of the concentrated liquid supplied from the concentrated liquid tank 200 is increased. A dilution/concentration unit (300) that re-supplies the concentrate tank (200);

To prevent desalination efficiency of the dilution/concentration unit 300 from being reduced, when the ion concentration of the concentrated solution stored in the concentrate tank 200 reaches the target concentration, the ion concentration of the concentrated solution stored in the concentrate tank 200 is adjusted to the target concentration. It is characterized by including a concentrate concentration maintenance unit 400 that maintains the concentration constant.

The diluent tank 100 is configured to store the dilution target solution, which is a desalination target whose ion concentration decreases depending on the operation of the system. The dilution tank 100 contains the initial stock solution (an aqueous solution containing ions, e.g. For example, it may be seawater) is first stored, and the initial stock solution is characterized in that the ion concentration continues to decrease depending on the operation of the system.

The diluent tank 100 is formed to have a certain size and capacity, and the dilution target solution stored in the diluent tank 100 is supplied to the dilution/concentration unit 300 to lower the ion concentration through desalination. In (300), the circulation process of diluted water with a lowered ion concentration through the desalting process and flowing back into the diluent tank 100 is repeated, and the ion concentration of the diluted solution stored in the diluted solution tank 100 continues according to the operation of the system. It becomes lower.

The concentrate tank 200 is configured to store a concentrated liquid whose ion concentration increases depending on the operation of the system. The concentrated liquid tank 200 contains initial raw water (an aqueous solution containing ions, such as tap water) as the concentrated liquid. or salt water) is first stored, and the initially stored raw water is characterized by its ion concentration continuing to increase as the system operates.

The concentrate tank 200 is formed to have a certain size and capacity, and the concentrated solution stored in the concentrate tank 200 is supplied to the dilution/concentration unit 300 to increase the ion concentration through desalting. In (300), the circulation process of diluted water of increased concentration through the desalting process and flowing back into the concentrate tank 200 is repeated, so that the ion concentration of the concentrated liquid stored in the concentrate tank 200 continues to increase according to the operation of the system. do.

The dilution/concentration unit 300 lowers the ion concentration of the diluted liquid supplied from the diluted liquid tank 100 through a desalting process and supplies it back to the diluted liquid tank 100, and supplies it from the concentrated liquid tank 200 through a concentration process. It is configured to increase the ion concentration of the concentrated liquid and re-supply it to the concentrated liquid tank (200).

Specifically, the dilution/concentration unit 300, as shown in FIG. 2,

A pair of electrode housings 310 that form a potential for desalination,

Two electrolyte chambers 315 formed adjacent to each other in a pair of electrode housings 310 to be filled with electrolyte,

A plurality of ion exchange membranes 320 disposed between a pair of electrode housings 310 to form a dilution chamber 330 and a concentration chamber 340,

The dilution target solution stored in the dilution tank 100 flows in, the ion concentration of the inflowed dilution target solution is lowered through a desalination process, and the dilution solution with the lowered ion concentration flows out into the dilution tank 100. A plurality of ions are provided. A plurality of dilution chambers 330 formed between a pair of electrode housings 310 by an exchange membrane 320, and

The concentrated liquid stored in the concentrated liquid tank 200 flows in, and the ion concentration of the concentrated liquid flowing in increases due to the ions coming from the dilution chamber 330 through the ion exchange membrane 320, and the concentrated liquid with the increased ion concentration A concentration chamber 340, which is a plurality of concentration regions formed between a pair of electrode housings 310 by a plurality of ion exchange membranes 320, to flow into the concentrate tank 200;

A first pump 351 and a first pump 351 that allow the diluted liquid stored in the diluent tank 100 to flow into the plurality of dilution chambers 330 at a constant pressure and return the diluted liquid of reduced concentration to the diluted liquid tank 100. 1 A diluent circulation unit 350 including a transfer pipe 352,

A second pump 361 and 2 Characterized in that it includes a concentrate circulation unit 360 including a transfer pipe 362, and the plurality of ion exchange membranes 320 include a plurality of cation exchange membranes 321 and a plurality of anion exchange membranes 322. It is characterized by

The pair of electrode housings 310 are configured to form a potential for desalination. As shown in FIG. 2, a (+) electric housing (Anode housing) to which electricity of (+) polarity is applied, and (-) It consists of a (-) electric housing (cathode housing) to which electricity of polarity is applied.

Therefore, a potential (electric field) for desalination is formed by electricity of (+) and (-) polarity applied to the pair of electrode housings 310, respectively, and the dilution supplied from the diluent tank 100 by the formed potential. Desalination occurs in which ions in the target solution move from the dilution chamber to the electrolyte chamber or concentration chamber.

The electrolyte chamber 315 is filled with an electrolyte supplied from the outside, and is formed in two so as to be adjacent to each other in a pair of electrode housings 310.

Referring to FIG. 3, the (-) ions in the dilution target solution pass through the anion exchange membrane 322 and flow into the electrolyte solution filled in the electrolyte chamber formed adjacent to the (+) electric housing (Anode housing), and (-) electric The (-) ions in the dilution target solution pass through the cation exchange membrane 321 and flow into the electrolyte solution filled in the electrolyte chamber formed adjacent to the cathode housing.

The plurality of ion exchange membranes 320 are disposed between a pair of electrode housings 310 to form the dilution chamber 330 and the concentration chamber 340. The plurality of ion exchange membranes 320 are configured to form a plurality of positive ions. It includes an exchange membrane 321 and a plurality of anion exchange membranes 322.

Referring to FIG. 3, cation exchange membranes 321 and anion exchange membranes 322 are alternately disposed between a pair of electrode housings 310 to form a dilution chamber 330 and a concentration chamber 340, and a dilution chamber ( The (+) ions in the dilution solution introduced into the dilution chamber 330 pass through the cation exchange membrane 321 and move to the electrolyte chamber or the adjacent concentration chamber 340, and the (+) ions in the dilution solution introduced into the dilution chamber 330 move to the electrolyte chamber or the adjacent concentration chamber 340. -) Ions pass through the anion exchange membrane 322 and move to the electrolyte chamber or the adjacent concentration chamber 340.

The dilution chamber 330 is where the diluted solution stored in the diluent tank 100 is introduced, the ion concentration of the inflowed diluted solution is lowered through a desalination process, and the diluted solution (dilution water) with the lowered ion concentration is diluted. It is a plurality of dilution regions formed between a pair of electrode housings 310 by a plurality of ion exchange membranes 320 to flow out into the tank 100.

Referring to FIG. 3, among the ions in the dilution target solution introduced into the dilution chamber 330, (+) ions pass through the cation exchange membrane 321 by the electric potential formed by the pair of electrode housings 310 and are transferred to the electrolyte solution. The negative ions move to the electrolyte chamber or the adjacent concentration chamber 340, and the negative ions pass through the anion exchange membrane 322 by the potential formed by the pair of electrode housings 310 and move to the electrolyte chamber or the adjacent concentration chamber 340. I do it.

The concentrate solution stored in the concentrate tank 200 flows into the concentration chamber 340, and the ion concentration of the inflow concentrate solution increases due to ions passing through the ion exchange membrane 320 and passing from the dilution chamber 330. It is a plurality of concentration regions formed between a pair of electrode housings 310 by a plurality of ion exchange membranes 320 so that the concentration target solution with increased ion concentration flows out into the concentrated solution tank 200.

Referring to FIG. 3, the ion concentration of the concentration solution flowing into the concentration chamber 340 due to the (+) ions and (-) ions coming from the dilution chambers 330 on both sides adjacent to the concentration chamber 340 is the concentration chamber ( 340) The concentration target solution (concentrated water) whose ion concentration is higher than the point of inflow flows out of the concentration chamber 340 and flows back into the concentrated solution tank 200.

The dilution solution circulation unit 350 allows the dilution target solution stored in the dilution tank 100 to flow into the plurality of dilution chambers 330 at a constant pressure, and the dilution target solution (dilution water) with a lowered ion concentration is stored in the dilution tank 100. ) It is a configuration that includes a first pump 351 and a first transfer pipe 352 to be recovered.

The first pump 351 operates to supply the dilution target solution stored in the dilution tank 100 to the plurality of dilution chambers 330 at a constant pressure through the first transfer pipe 352.

In addition, the first transfer pipe 352 allows the dilution target solution stored in the dilution tank 100 to flow into the plurality of dilution chambers 330, and at the same time allows the dilution target solution (dilution water) with a lowered ion concentration to flow into the dilution tank ( 100), as shown in FIG. 3, it is connected and installed between the diluent tank 100 and the front end of the plurality of dilution chambers 330 and between the diluent tank 100 and the rear end of the plurality of dilution chambers 330.

The concentrated liquid circulation unit 360 allows the concentrated liquid stored in the concentrated liquid tank 200 to flow into the plurality of concentration chambers 340 at a certain pressure, and allows the concentrated liquid with increased ion concentration to be recovered into the concentrated liquid tank 200. It is a configuration including a second pump 361 and a second transfer pipe 362.

The second pump 361 operates to supply the concentrated liquid stored in the concentrated liquid tank 200 to the plurality of concentration chambers 340 at a constant pressure through the second transfer pipe 362.

In addition, the second transfer pipe 362 allows the concentrated liquid stored in the concentrated liquid tank 200 to flow into the plurality of concentration chambers 340, and at the same time allows the concentrated liquid (concentrated water) with an increased ion concentration to flow into the concentrated liquid tank ( 200), as shown in FIG. 3, it is connected and installed between the concentrate tank 200 and the front end of the plurality of enrichment chambers 340 and between the concentrate tank 200 and the rear end of the plurality of enrichment chambers 340.

Meanwhile, desalting efficiency varies depending on the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200. Desalination efficiency refers to the degree to which ions in the dilution chamber 330 pass into the concentration chamber 340 through the ion exchange membrane 320.

If the ion concentration in the concentration chamber 340 is excessive, that is, if the ion concentration of the concentration liquid stored in the concentrate tank 200 is above a certain concentration, the ions in the concentration chamber 340 may be transferred through the ion exchange membrane 320. A reverse desalination phenomenon occurs in which the desalination elements pass into the dilution chamber 330, thereby reducing desalination efficiency.

Therefore, in order to prevent desalination efficiency from decreasing, there is a need to prevent the ion concentration of the concentrated solution stored in the concentration chamber 340 from rising above a certain level (target concentration), and the configuration for this is to maintain the concentration of the concentrated solution of the present invention. It is wealth (400).

The concentrate concentration maintenance unit 400 adjusts the ion concentration of the concentrate solution stored in the concentrate tank 200 to the target concentration when the ion concentration of the concentrate solution stored in the concentrate tank 200 reaches the target concentration so that desalination efficiency is not reduced. It is a configuration that is kept constant.

Meanwhile, in the case of a conventional desalination system, when the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200 increases to a concentration that reduces desalination efficiency, the concentrated liquid stored in the concentrated liquid tank 200 is replaced with initial raw water. There was an interruption in the desalination process that stopped the desalination system, making continuous operation difficult. However, in the present invention (10), the ion concentration of the concentrated solution stored in the concentrate tank (200) is adjusted to the target concentration through the concentrate concentration maintenance unit (400). When , the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200 is maintained at a constant target concentration, thereby preventing desalination efficiency from decreasing and enabling continuous operation without stopping the operation of the desalination system.

Specifically, the concentrate concentration maintenance unit 400, as shown in FIG. 4,

a concentration detection sensor 410 that detects the ion concentration of the concentrated solution stored in the concentrate tank 200 and provides the detected ion concentration information to the control unit 470;

A third pump 420 that operates under the control of the control unit 470 so that the concentrated liquid stored in the concentrated liquid tank 200 is supplied to the ion adsorption/desorption unit 440 at a constant pressure,

When the third pump 420 operates, the third transfer pipe 430 allows the concentrated liquid stored in the concentrated liquid tank 200 to be transferred to the ion adsorption/desorption unit 440;

Ion absorption lowers the ion concentration of the concentrated liquid transferred through the third transfer pipe 430 through ion adsorption or increases the ion concentration of the concentrated liquid transferred through the third transfer pipe 430 through ion desorption. /Removable part 440,

A first opening/closing valve 451 whose opening and closing is controlled under the control of the control unit 470 is installed, and a agent for recovering the concentrated liquid with a lowered ion concentration to the concentrated liquid tank 200 through the ion absorption/desorption unit 440 4 transfer pipe 450,

A second opening/closing valve 461 whose opening and closing is controlled under the control of the control unit 470 is installed, and a fifth transfer pipe ( 460) and,

Electricity for ion adsorption and desorption of the ion adsorption/desorption unit 440 is controlled to be applied to the ion adsorption/desorption unit 440, and the ion adsorption/desorption unit (440) is controlled using the concentration information provided by the concentration detection sensor 410. A control unit 470 that controls the concentrated liquid with a lowered ion concentration discharged from the 440 to be recovered into the concentrated liquid tank 200 or the concentrated liquid with a higher ion concentration discharged from the ion absorption/desorption unit 440 to be discharged to the outside. ) is characterized in that it includes.

The concentration detection sensor 410 is configured to detect the ion concentration of the concentrated liquid stored in the concentrate tank 200 and provide the detected ion concentration information to the control unit 470. The control unit 470 determines whether to operate the third pump 420 using the ion concentration information of the concentrate stored in the concentrate tank 200.

Operating the third pump 420 means operating the concentrate concentration maintenance unit 400. Whether or not the concentrate concentration maintenance unit 400 is operated is determined using the ion concentration information of the concentrate stored in the concentrate tank 200. The reason for this decision is that the ion concentration of the concentrate stored in the concentrate tank 200 and the desalting efficiency of the dilution/concentration unit 300 are related.

Desalination efficiency refers to the degree to which ions in the dilution chamber 330 pass through the ion exchange membrane 320 to the enrichment chamber 340. If the ion concentration in the enrichment chamber 340 is excessive, that is, the concentrate tank If the ion concentration of the concentration target solution stored in (200) is above a certain concentration, a reverse desalting phenomenon occurs in which ions in the concentration chamber 340 pass through the ion exchange membrane 320 to the dilution chamber 330, thereby lowering the desalination efficiency. It deteriorates.

Therefore, if the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200 is above a certain concentration (target concentration), the concentrated liquid concentration maintaining unit 400 is operated to prevent a decrease in the desalting efficiency of the dilution/concentrating unit 300. The purpose is to prevent a decrease in the desalination efficiency of the dilution/concentration unit 300 by maintaining the ion concentration of the concentrated solution stored in the concentrate tank 200 at a constant target concentration.

The third pump 420 is configured to operate under the control of the control unit 470 so that the concentrated liquid stored in the concentrated liquid tank 200 is supplied to the ion adsorption/desorption unit 440 at a constant pressure, and the control unit ( According to the control signal of 470), the concentrated liquid stored in the concentrated liquid tank 200 is pumped at a constant pressure so that it is supplied to the ion adsorption/desorption unit 440.

The third transfer pipe 430 is configured to transfer the concentrated liquid stored in the concentrate tank 200 to the ion adsorption/desorption unit 440 when the third pump 420 operates. 430 is a pipe connected between the concentrate tank 200 and the front end of the ion adsorption/desorption unit 440.

The ion adsorption/desorption unit 440 lowers the ion concentration of the concentrated liquid transferred through the third transfer pipe 430 through ion adsorption, or reduces the ion concentration of the concentrated liquid transferred through the third transfer pipe 430. It is a configuration that increases the ion concentration through ion desorption. Additionally, if necessary, the ion adsorption/desorption unit 440 may be comprised of multiple units.

Specifically, the ion adsorption/desorption unit 440, as shown in FIG. 4,

A first carbon electrode 441 to which electricity of different polarities is alternately applied under the control of the control unit 470, and to which anions passing through the anion exchange membrane 443 are adsorbed or the adsorbed anions are desorbed;

It is installed at a certain distance from the first carbon electrode 441, and electricity of a polarity opposite to that applied to the first carbon electrode 441 is alternately applied under the control of the control unit 470 and passes through the cation exchange membrane 444. A second carbon electrode 442 on which one cation is adsorbed or the adsorbed cation is desorbed,

An anion exchange membrane 443 installed adjacent to the first carbon electrode 441,

A cation exchange membrane 444 installed adjacent to the second carbon electrode 442,

It is characterized by including a concentrated liquid movement passage 445 formed between the anion exchange membrane 443 and the cation exchange membrane 444.

The first carbon electrode 441 is configured so that electricity of different polarities is alternately applied under the control of the control unit 470, and anions passing through the anion exchange membrane 443 are adsorbed or the adsorbed anions are desorbed.

For example, when electricity of (+) polarity is applied to the first carbon electrode 441, as shown in FIG. 5, among the ions in the solution to be concentrated, (-) passes through the anion exchange membrane 443. ) ions are adsorbed to the first carbon electrode 441, and conversely, when electricity of (-) polarity is applied to the first carbon electrode 441, as shown in FIG. 6, the first carbon electrode 441 The (-) ions adsorbed are desorbed and pass through the anion exchange membrane 443 to the concentrated liquid transfer passage 445.

The second carbon electrode 442 is installed at a certain distance from the first carbon electrode 441, and electricity of a polarity opposite to that applied to the first carbon electrode 441 is alternately applied under the control of the control unit 470. In this configuration, cations passing through the cation exchange membrane 444 are adsorbed or the adsorbed cations are desorbed.

For example, when electricity of (-) polarity is applied to the second carbon electrode 442, as shown in FIG. 5, among the ions in the solution to be concentrated, (+) passes through the cation exchange membrane 444. ) ions are adsorbed to the second carbon electrode 442, and conversely, when electricity of (+) polarity is applied to the second carbon electrode 442, as shown in FIG. 6, the second carbon electrode 442 The (+) ions adsorbed are desorbed and pass through the cation exchange membrane 444 to the concentrated liquid transfer passage 445.

Referring to FIG. 4, the anion exchange membrane 443 is installed adjacent to the first carbon electrode 441, and the cation exchange membrane 444 is installed adjacent to the second carbon electrode 442.

As shown in FIG. 5, the (-) ions in the concentrated liquid flowing into the concentrated liquid movement passage 445 pass through the anion exchange membrane 443 and move toward the first carbon electrode 441, or 1 As shown in FIG. 6, the (-) ions adsorbed on the carbon electrode 441 pass through the anion exchange membrane 443 and move toward the concentrated liquid movement passage 445.

In addition, as shown in FIG. 5, the (+) ions in the concentrated liquid flowing into the concentrated liquid movement passage 445 pass through the cation exchange membrane 444 and move toward the second carbon electrode 442. As shown in FIG. 6, the (+) ions adsorbed on the second carbon electrode 442 pass through the cation exchange membrane 444 and move toward the concentrated liquid movement passage 445.

The concentrated liquid movement passage 445 is formed by the anion exchange membrane 443 and the cation exchange membrane 444 and is a movement space through which the concentrated liquid flowing out of the concentrated liquid tank 200 moves, and is formed by the first carbon electrode 441. Depending on the electrical polarity applied to the second carbon electrode 442, the ion concentration of the concentrated liquid flowing out of the concentrated liquid tank 200 passing through the concentrated liquid movement passage 445 is desalinated or the ion concentration is lowered. This supplement increases the ion concentration.

The fourth transfer pipe 450 is installed with a first opening/closing valve 451 whose opening and closing is controlled under the control of the control unit 470, and is discharged with a reduced ion concentration through the ion absorption/desorption unit 440. In a configuration where the liquid to be concentrated is returned to the concentrated liquid tank 200, one side of the fourth transfer pipe 450 is connected to the rear end of the liquid to concentrate moving passage 445, and the other side is connected to the concentrated liquid tank 200.

As shown in FIG. 5, when electricity of (+) polarity is applied to the first carbon electrode 441 and electricity of (-) polarity is applied to the second carbon electrode 442, on the fourth transfer pipe 450 The first on/off valve 451 installed in is in an open state under the control of the control unit 470 (at this time, the second on/off valve 461 installed on the fifth transfer pipe 460 is in a closed state), and ion absorption/ The concentrated liquid discharged with a reduced ion concentration through the desorption unit 440 is recovered into the concentrated liquid tank 200 through the fourth transfer pipe 450.

The fifth transfer pipe 460 is equipped with a second opening and closing valve 461 whose opening and closing is controlled by the control of the control unit 470, and the concentrated ion is discharged in a state of increased concentration through the ion adsorption/desorption unit 440. In a configuration that discharges the target liquid to the outside, one side of the fifth transfer pipe 460 is connected to the rear end of the concentrated target liquid movement passage 445, and the other side is connected to the outside.

As shown in FIG. 6, when electricity of (-) polarity is applied to the first carbon electrode 441 and electricity of (+) polarity is applied to the second carbon electrode 442, on the fifth transfer pipe 460 The second on/off valve 461 installed is in an open state under the control of the control unit 470 (at this time, the first on/off valve 451 installed on the fourth transfer pipe 450 is in a closed state), and ion absorption/closing occurs. The concentrated liquid discharged with an increased ion concentration is discharged to the outside through the desorption unit 440.

The control unit 470 controls electricity for ion adsorption and desorption of the ion adsorption/desorption unit 440 to be applied to the ion adsorption/desorption unit 440, and uses the ion concentration information provided by the concentration detection sensor 410. The concentrated liquid with a lowered ion concentration discharged from the ion adsorption/desorption unit 440 is recovered to the concentrated liquid tank 200, or the concentrated liquid with a higher ion concentration discharged from the ion adsorption/desorption unit 440 is stored outside. It is a configuration that controls discharge to .

That is, the control unit 470 controls the polarity of electricity applied to the first carbon electrode 441 and the second carbon electrode 442 of the ion adsorption/desorption unit 440, It is configured so that ion adsorption and desorption processes occur alternately.

Specifically, the control unit 470 operates the third pump 420 when the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200 reaches the target concentration according to the ion concentration information provided by the concentration detection sensor 410. By operating it, the concentrated liquid stored in the concentrated liquid tank 200 flows into the concentrated liquid moving passage 445 of the ion adsorption/desorption unit 440.

With the third pump 420 in operation, the control unit 470 applies (+) polarity to the first carbon electrode 441 during the first time period (ion adsorption time), as shown in FIG. 5. Electricity of negative polarity is applied to the second carbon electrode 442, and at the same time, a first control is performed to open the first on-off valve 451 and close the second on-off valve 461. , Among the ions in the concentrated liquid flowing into the concentrated liquid movement passage 445, (-) ions are adsorbed to the first carbon electrode 441, and (+) ions are adsorbed to the second carbon electrode 442. By adsorbing, the concentrated liquid with lowered ion concentration is recovered into the concentrated liquid tank 200.

After performing the first control, while operating the third pump 420, the control unit 470 operates the first carbon electrode 441 during the second time period (ion desorption time), as shown in FIG. 6. Electricity of (-) polarity is applied to and electricity of (+) polarity is applied to the second carbon electrode 442, and at the same time, the first on-off valve 451 is closed and the second on-off valve 461 is open. By performing the second control, the (-) ions adsorbed on the first carbon electrode 441 are desorbed, and the (+) ions adsorbed on the second carbon electrode 442 are desorbed, so that the ion concentration increases. Ensure that the increased concentrated liquid is discharged to the outside.

The reason for desorbing the ions adsorbed on the first carbon electrode 441 and the second carbon electrode 442 in the second time period (ion desorption time) is that in the next first time period (ion adsorption time), the first carbon This is to prevent the ion adsorption efficiency of the electrode 441 and the second carbon electrode 442 from decreasing.

In the first time period (ion adsorption time), ions are adsorbed to the first carbon electrode 441 and the second carbon electrode 442, and if ion adsorption proceeds in the next first time period without desorption of the adsorbed ions, During the previous ion adsorption time, the ion adsorption efficiency of the first carbon electrode 441 and the second carbon electrode 442 decreased due to the ions adsorbed on the first carbon electrode 441 and the second carbon electrode 442. Because it becomes.

Meanwhile, when performing the second control, the control unit 470 supplies initial raw water (e.g., tap water, salt water) to the concentrated liquid tank 200 equal to the amount of the concentrated liquid discharged to the outside.

For example, a certain amount of concentrated liquid is discharged to the outside using a measuring means for measuring the amount of concentrated liquid discharged to the outside and a supply pipe to supply initial raw water (e.g., tap water, salt water) to the concentrated liquid tank 200. If so, the corresponding amount of initial raw water (e.g., tap water, salt water) is supplied to the concentrate tank 200.

In addition, the control unit 470 periodically alternates between the above-described first control and the second control to keep the ion concentration of the concentrated liquid stored in the concentrated liquid tank 200 constant so as not to increase above the target concentration. .

Although the technical idea of the present invention has been described above with the accompanying drawings, this is an illustrative description of a preferred embodiment of the present invention and does not limit the present invention, and the scope of the present invention is not limited to the embodiments. It will be obvious to those skilled in the art that this invention includes modifications within the scope of the technical idea of the present invention.

10: Desalination system that enables continuous operation and prevents deterioration of desalination efficiency
100: diluent tank
200: Concentrate tank
300: Dilution/Concentration Department
400: Concentrate concentration maintenance unit

Claims (7)

In a desalination system that allows continuous operation and prevents deterioration in desalination efficiency,
a diluent tank 100 that stores a diluted solution whose ion concentration is lowered as the system operates;
a concentrated liquid tank 200 that stores a concentrated liquid whose ion concentration increases as the system operates;
Through the desalting process, the ion concentration of the diluted liquid supplied from the diluent tank 100 is lowered and re-supplied to the diluted liquid tank 100, and through the concentration process, the ion concentration of the concentrated liquid supplied from the concentrated liquid tank 200 is increased. A dilution/concentration unit (300) that re-supplies the concentrate tank (200);
To prevent desalination efficiency of the dilution/concentration unit 300 from being reduced, when the ion concentration of the concentrated solution stored in the concentrate tank 200 reaches the target concentration, the ion concentration of the concentrated solution stored in the concentrate tank 200 is adjusted to the target concentration. A desalination system capable of continuous operation and preventing deterioration in desalination efficiency, comprising a concentrate concentration maintenance unit 400 that maintains the concentration constant.
In claim 1,
In the diluent tank 100, the initial stock solution is initially stored as the dilution target liquid, and the ion concentration of the initially stored initial stock solution is lowered according to the operation of the system,
A desalination system that enables continuous operation and prevents deterioration in desalination efficiency, wherein the concentrate tank 200 initially stores initial raw water as the concentrate liquid, and the ion concentration of the initially stored raw water increases depending on the operation of the system.
In claim 1,
The dilution/concentration unit 300,
A pair of electrode housings 310 that form a potential for desalination,
Two electrolyte chambers 315 formed adjacent to each other in a pair of electrode housings 310 to be filled with electrolyte,
A plurality of ion exchange membranes 320 disposed between a pair of electrode housings 310 to form a dilution chamber 330 and a concentration chamber 340,
The dilution target solution stored in the dilution tank 100 flows in, the ion concentration of the inflowed dilution target solution is lowered through a desalination process, and the dilution solution with the lowered ion concentration flows out into the dilution tank 100. A plurality of ions are provided. A plurality of dilution chambers 330 formed between a pair of electrode housings 310 by an exchange membrane 320, and
The concentrated liquid stored in the concentrated liquid tank 200 flows in, and the ion concentration of the concentrated liquid flowing in increases due to the ions coming from the dilution chamber 330 through the ion exchange membrane 320, and the concentrated liquid with the increased ion concentration A concentration chamber 340, which is a plurality of concentration regions formed between a pair of electrode housings 310 by a plurality of ion exchange membranes 320, to flow into the concentrate tank 200;
A first pump 351 and a first pump 351 that allow the diluted liquid stored in the diluent tank 100 to flow into the plurality of dilution chambers 330 at a constant pressure and return the diluted liquid of reduced concentration to the diluted liquid tank 100. 1 A diluent circulation unit 350 including a transfer pipe 352,
A second pump 361 and 2 Includes a concentrate circulation unit 360 including a transfer pipe 362,
The plurality of ion exchange membranes 320 are,
A desalination system capable of continuous operation and preventing deterioration in desalination efficiency, comprising a plurality of cation exchange membranes 321 and a plurality of anion exchange membranes 322.
In claim 1,
The concentrate concentration maintenance unit 400,
a concentration detection sensor 410 that detects the ion concentration of the concentrated solution stored in the concentrate tank 200 and provides the detected ion concentration information to the control unit 470;
A third pump 420 that operates under the control of the control unit 470 so that the concentrated liquid stored in the concentrated liquid tank 200 is supplied to the ion adsorption/desorption unit 440 at a constant pressure,
When the third pump 420 operates, the third transfer pipe 430 allows the concentrated liquid stored in the concentrated liquid tank 200 to be transferred to the ion adsorption/desorption unit 440;
Ion absorption lowers the ion concentration of the concentrated liquid transferred through the third transfer pipe 430 through ion adsorption or increases the ion concentration of the concentrated liquid transferred through the third transfer pipe 430 through ion desorption. /Removable part 440,
A first opening/closing valve 451 whose opening and closing is controlled under the control of the control unit 470 is installed, and a agent for recovering the concentrated liquid with a lowered ion concentration to the concentrated liquid tank 200 through the ion absorption/desorption unit 440 4 transfer pipe 450,
A second opening/closing valve 461 whose opening and closing is controlled under the control of the control unit 470 is installed, and a fifth transfer pipe ( 460) and,
Electricity for ion adsorption and desorption of the ion adsorption/desorption unit 440 is controlled to be applied to the ion adsorption/desorption unit 440, and the ion adsorption/desorption unit 440 is controlled using the ion concentration information provided by the concentration detection sensor 410. A control unit ( 470) A desalination system capable of continuous operation and preventing deterioration of desalination efficiency.
In claim 4,
Each of the plurality of ion adsorption/desorption units 440,
A first carbon electrode 441 to which electricity of different polarities is alternately applied under the control of the control unit 470, and to which anions passing through the anion exchange membrane 443 are adsorbed or the adsorbed anions are desorbed;
It is installed at a certain distance from the first carbon electrode 441, and electricity of a polarity opposite to that applied to the first carbon electrode 441 is alternately applied under the control of the control unit 470 and passes through the cation exchange membrane 444. A second carbon electrode 442 on which one cation is adsorbed or the adsorbed cation is desorbed,
An anion exchange membrane 443 installed adjacent to the first carbon electrode 441,
A cation exchange membrane 444 installed adjacent to the second carbon electrode 442,
A desalination system capable of continuous operation and preventing deterioration of desalination efficiency, comprising a passage 445 for moving the concentrated liquid formed between an anion exchange membrane 443 and a cation exchange membrane 444.
In claim 4,
The control unit 470,
When the concentration of the concentrated liquid stored in the concentrated liquid tank 200 reaches the target concentration according to the concentration information provided by the concentration detection sensor 410, the third pump 420 is operated,
With the third pump 420 in operation, electricity of positive polarity is applied to the first carbon electrode 441 and electricity of negative polarity is applied to the second carbon electrode 442 during the first time period. At the same time, a first control is performed such that the first on-off valve 451 is opened and the second on-off valve 461 is closed,
After performing the first control, with the third pump 420 operating, during the second time period, electricity of (-) polarity is supplied to the first carbon electrode 441 and (+) to the second carbon electrode 442. ) At the same time as electricity of polarity is applied, a second control is performed to close the first on-off valve 451 and open the second on-off valve 461,
A desalination system capable of continuous operation and preventing deterioration of desalination efficiency, characterized in that the first control and the second control are periodically alternated.
In claim 6,
The control unit 470,
During the second control, continuous operation is possible and desalination efficiency is prevented by controlling the initial raw water to be supplied to the concentrate tank 200 equal to the amount of concentrate discharged to the outside through the fifth transfer pipe 460. Desalination system.