KR20150038912A - Non-Dischargeable Convergence Seawater Distillation Apparatus Using Non-Used Energy - Google Patents

Abstract

According to the present invention, a desalination device comprises a first desalination unit for desalinating the seawater to be separated into the condensed water and the produced water; and a membrane distillation unit into which the the condensed water separated from the first desalination unit is introduced, and cools the condensed water to allow the seawater, to be separated into the first condensed water and the first produced water, to be introduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seawater desalination apparatus for desalination,

The present invention relates to a non-discharge type fused composite seawater desalination apparatus using unexhausted energy, and more particularly, to a desalination system for desalination, Discharge type fused composite seawater desalination apparatus using unused energy that can be minimized.

There is a large amount of water on earth, but there is a shortage of water that humans can use safely. Due to these reasons, seawater desalination technology is being developed.

In order to obtain fresh water from seawater, a process is required to remove components that are dissolved or suspended in seawater and that are inappropriate for water and drinking water standards. There are many ways to desalinate seawater. Among them, reverse osmosis and electrodialysis are mainly used.

The desalination apparatus using the reverse osmosis method has a structure in which ionic substances dissolved in water are almost excluded and pure water is used to remove ionic substances dissolved in the seawater by passing the reverse osmosis membrane.

In order to separate the ionic material and pure water from such raw water, a higher pressure than the osmotic pressure is required. This pressure is called reverse osmosis pressure, and seawater desalination requires a high pressure of about 50 to 70 bar. In order to provide such reverse osmosis pressure, a desalination apparatus using a reverse osmosis method is provided with raw water supply means for pressurizing the raw water.

In general, since a high-pressure pump consuming a large amount of electric power is used as a raw water supply means, there is a disadvantage that considerable energy is consumed for desalination of seawater.

In recent years, the reverse osmosis system also has a high energy consumption, so that a pure osmosis system has been developed in which fresh water is obtained from seawater by using pure osmosis phenomenon without using a high-pressure pump. In the case of this osmotic osmosis system, water of seawater is extracted by osmotic phenomenon using a very high concentration of induction solution rather than seawater. In this method, further heat energy is consumed in order to obtain fresh water from the diluted induction solution . Except when using waste heat, energy consumption is known to be higher in comparison with general reverse osmosis desalination systems.

That is, it is necessary to develop an apparatus and a method for increasing the recovery rate of fresh water for seawater while maintaining a low energy consumption characteristic in any type of desalination apparatus.

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Accordingly, the present invention has been made to solve the conventional problems, and it is an object of the present invention to provide a desalination apparatus and a desalination apparatus for desalination, which are capable of minimizing resources, Discharge type fused composite seawater desalination apparatus.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a seawater desalination apparatus including a first desalination unit separating seawater into desalinated water and produced water, and a second desalination unit separating the concentrated water from the first desalination unit, And a membrane distillation unit into which seawater for cooling into the first concentrated water and the first produced water is introduced.

At this time, the membrane distillation unit may be connected to the first desalination unit to cool the concentrated water and discharge the heated seawater to the first desalination unit.

In the first desalination unit, seawater used as a cold source of heat in the membrane distillation unit flows and flows into the second distilled water and the second concentrated water, and the second concentrated water flows into the membrane distillation unit A nanofiltration membrane.

In addition, the first desalination unit separates the second production water separated from the nanofiltration membrane into a third production water and a third concentrated water, The third concentrated water may include a reverse osmosis membrane that flows into the membrane distillation unit.

The seawater used as a cold source of the membrane distillation unit flows and flows into the first desalination unit, and the seawater is separated into the third production water and the third concentrated water to discharge the third production water to the outside, 3 concentrated water may include a reverse osmosis membrane that flows into the membrane distillation unit.

Further, the apparatus further includes a heat pump unit for supplying heat to the first desalination unit, wherein the bottom pump unit comprises a high-temperature source supply unit and the concentrated water that is separated from the first desalination unit and flows into the membrane distillation unit The first heat exchanger may include a first heat exchanger that heats the heat source through the heat exchanger.

The heatex pump unit further includes a high-temperature source supply unit and seawater flowing from the membrane distillation unit to the first desalination unit to the high-temperature source supply unit, And a second heat exchanger that heats the heat source through the heat exchange.

Further comprising a heat pump unit for supplying heat to the first desalination unit, wherein the bottom pump unit comprises a high-temperature source supply unit, the concentrated water introduced into the membrane distillation unit separated from the first desalination unit, A first heat exchanger in which a high heat source that has recovered heat from the original supply unit flows and heats through heat exchange; and a high heat source that recovers heat from the high temperature source supply unit in the membrane distillation unit, And a second heat exchanger for heating through heat exchange.

In addition, the first heat exchanger and the second heat exchanger may sequentially flow the high heat source.

The heat pump unit may further include a high-temperature source supply unit and the second produced water separated from the nanofiltration membrane and flowing to flow into the reverse osmosis membrane, And a third heat exchanger in which the high-temperature source recovered heat from the high-temperature source supply unit flows and heats through heat exchange.

Further, it is preferable that the heat pump unit further comprises a heat pump unit for supplying heat to the first desalination unit, wherein the first and second concentrated water and the raw water separated from the high- And a fourth heat exchanger in which the high-temperature heat source that has recovered heat from the supply unit flows and heats the heat by heat exchange.

The apparatus may further include a dissolved substance extracting unit for extracting dissolved substances from the first concentrated water discharged from the membrane distillation unit.

The dissolved substance extracting unit may be configured to remove at least a portion of the first concentrated water discharged from the membrane distillation unit and to separate the separated first concentrated water from the fourth concentrated water, Device.

The dissolved substance extracting unit may further include a pressure delayed osmosis unit for introducing the first concentrated water discharged from the membrane distillation unit to use the salt for the differential pressure generation and then discharging the first concentrated water to the decontamination unit .

In addition, the dissolved substance extraction unit separates the first concentrated water discharged from the membrane distillation unit into a sixth product water and a fifth concentrated water to discharge the sixth product water to the outside, and the fifth enriched water And a purified osmotic device for discharging water to the decontamination device.

Also, at least a part of the first concentrated water flows in and flows into the fifth product water and the fourth concentrated water, and the fifth product water is discharged to the outside, and the fourth concentrated water is discharged to the dissolved substance extraction unit And a second desalination unit for introducing the second desalination unit.

The second desalination unit may be an electrodialysis unit.

The seawater desalination apparatus of the present invention has the following effects.

First, it can effectively reduce the abandoned resources by efficiently reusing the enrichment resources generated in the seawater desalination process in multiple stages.

Second, it is possible to increase the production yield by increasing the temperature of seawater, production water and concentrated water by using high heat source obtained from waste heat and heat pump, and to produce concentrated water of high concentration. Can be minimized.

Third, the concentrated water of high temperature is cooled by the natural heat source of seawater, so that the weight of the fresh water system can be reduced.

Fourth, there is an effect that a concentrated water of a high concentration can be utilized for salinity generation to produce electric power.

Fifth, concentrated water having a high concentration can be desalinated through several steps to obtain fresh water having various conditions that can be used in various places of use.

Sixth, there is an effect that a dissolved substance such as salt can be extracted through the decontamination process of concentrated water of high concentration.

Seventh, there is an effect that seawater desalination function can be improved by utilizing unused energy which is not used in the existing apparatus.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a desalination apparatus according to the present invention; FIG.
2 is a schematic diagram of a desalination apparatus according to a modification of the present invention;
3 is a configuration diagram of a desalination apparatus according to a first embodiment of the present invention;
4 is a configuration diagram of a desalination apparatus according to a second embodiment of the present invention;
5 is a configuration diagram of a desalination apparatus according to a third embodiment of the present invention;
6 is a view showing the arrangement of a heat exchanger used in a desalination apparatus according to the present invention;
FIGS. 7 and 8 are diagrams showing a configuration of a desalination apparatus according to a fourth embodiment of the present invention; FIG.
9 is a configuration diagram of a desalination apparatus according to a fifth embodiment of the present invention; And
10 is a configuration diagram of a desalination apparatus according to a sixth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a desalination apparatus according to the present invention. The desalination apparatus 10 according to the present invention comprises a first desalination unit 100 and a membrane distillation unit 200 as shown in FIG.

The first desalination unit 100 is an apparatus for separating seawater flowing in from the outside into desalted water and concentrated water.

The membrane distillation unit 200 receives the concentrated water separated from the first desalination unit 100 and cools the concentrated water through the membrane distillation to cool the concentrated water to the first concentrated water and the first produced water, Lt; / RTI >

In this membrane distillation unit 200, the concentrated water separated from the first desalination unit 100 flows into one side of the membrane through which water vapor passes and the liquid does not pass, and the temperature of the seawater and the concentrated water And is separated into the first concentrated water and the first produced water by the steam generated by the tea.

2 is a schematic configuration diagram of a desalination apparatus according to a modification of the present invention. 1, the desalination apparatus 10 according to the present invention has a structure in which seawater flowing into the first desalination unit 100 and seawater for cooling the concentrated water discharged from the first desalination unit 100 are different from each other Path.

However, when the temperature of the seawater is increased to a proper temperature, the production yield of the first desalination unit 100 is improved. Therefore, as shown in FIG. 2, the concentrated distilled water is cooled in the membrane distillation unit 200, So that it flows into the first desalination unit 100 without being discharged to the first desalination unit 100. Since the seawater discharged from the membrane distillation unit 200 flows through the membrane distillation unit 200 and is discharged in an improved temperature, the first desalination unit 100 is produced The yield can be improved.

Hereinafter, as shown in FIG. 2, the description will be made on the basis that the heated seawater flowing into the membrane distillation unit 200 flows into the first desalination unit 100. It is obvious that the configuration shown in FIG. 1 can be selected in consideration of the usage mode, the installation environment, and the like, and is based on one embodiment only for convenience of explanation.

First Embodiment

3 is a configuration diagram of a desalination apparatus according to the first embodiment of the present invention. The desalination apparatus 10 according to the first embodiment of the present invention has a configuration similar to that of Fig. 2 described above, as shown in Fig.

The first desalination unit 100 separates the seawater used as a cold source of the membrane distillation unit 200 into the second produced water and the second concentrated water while flowing, And a nanofiltration membrane 110 for introducing the nanofiltration membrane.

The nanofiltration membrane 110 is a device for filtering contaminants or impurities present in seawater by passing water through a separation membrane. Here, the contaminants or impurities separated from the seawater correspond to the second concentrated water, and the seawater passing through the separation membrane corresponds to the second production water.

The second concentrated water separated from the nanofiltration membrane 110 is separated into the first concentrated water and the first produced water through the membrane distillation unit 200.

The membrane distillation unit 200 is separated into the first product water and the first concentrated water through the method of recovering the water vapor generated from the second concentrated water flowing into the high temperature as fresh water using the porous hydrophobic membrane. That is, water droplets that have passed through the porous hydrophobic membrane and cooled by sea water caused by cold heat become the first production water, and the portion that flows without passing through the porous hydrophobic membrane becomes the first concentrated water.

Second Embodiment

4 is a configuration diagram of a desalination apparatus according to a second embodiment of the present invention. The desalination apparatus 10 according to the second embodiment of the present invention has the same configuration as that of the first embodiment as a whole.

However, there is a difference in that the first desalination unit 100 is composed of a reverse osmosis membrane (120) instead of the nanofiltration membrane (110).

The reverse osmosis membrane 120 separates the seawater into the third production water and the third concentrated water by using the reverse osmosis phenomenon in which water is moved to the low concentration solution side through the reverse osmosis membrane 120 which is a semipermeable membrane when pressure higher than osmotic pressure is applied to the high concentration solution Device. That is, the water that has passed through the reverse osmosis membrane 120 is the third production water, and the sea water that does not pass through the reverse osmosis membrane 120 is the third concentrated water.

Similar to the nanofiltration membrane 110 of the first embodiment, the reverse osmosis membrane 120 discharges the third produced water to the outside, and the third concentrated water flows into the membrane distillation unit 200 again.

The configuration and function of the membrane distillation unit 200 are the same as those of the first embodiment described above, and thus a detailed description thereof will be omitted.

Third Embodiment

5 is a configuration diagram of a desalination apparatus according to a third embodiment of the present invention. The desalination apparatus 10 according to the third embodiment of the present invention generally comprises a first desalination unit 100 and a membrane distillation unit 200 similar to the first and second embodiments.

The first desalination unit 100 according to the third embodiment includes a nanofiltration membrane 110 and a reverse osmosis membrane 120, and the structure thereof will be described in detail as follows.

The nano-filtration membrane 110 flows into the membrane distillation unit 200 and then the seawater is supplied to the nano-filtration membrane 110. The seawater flows through the nano-filtration membrane 110 and is separated into the second produced water and the second concentrated water.

The separated second concentrated water flows into the membrane distillation unit 200 as in the first embodiment, and the second produced water flows into the reverse osmosis membrane 120 without being discharged to the outside as in the first embodiment.

The reverse osmosis membrane 120 separates the first produced water separated from the nanofiltration membrane 110 into a third produced water and a third concentrated water using a reverse osmosis phenomenon. The third produced water thus separated is discharged to the outside, and the third concentrated water flows into the distillation unit 200 again.

As such, the first desalination unit 100 according to the third embodiment includes the nanofiltration membrane 110 and the reverse osmosis membrane 120. The first desalination unit 100 is composed of a nanofiltration membrane 110 and a reverse osmosis membrane 120. The second concentrated water and the third concentrated water produced through the membrane 110 are then returned to the first concentrated water 1 through the multi-stage concentrated water extraction process which is separated into production water, the production yield can be improved and a concentrated water of high concentration can be produced.

Here, the configuration and function of the nanofiltration membrane 110, the reverse osmosis membrane 120, and the membrane distillation unit 200 are the same as those of the above-described embodiments, and thus a detailed description thereof will be omitted.

Placement of heat exchanger

6 is a configuration diagram showing the arrangement of a heat exchanger used in the desalination apparatus according to the present invention. The seawater desalination apparatus 10 according to the present invention can reduce the damage of the apparatus and improve the production yield by improving the production water and the concentrated water introduced into each apparatus to a predetermined temperature, A heat pump unit is provided.

The heat pump unit is composed of a high-temperature source supply unit 400 and a plurality of heat exchangers.

The high-temperature source supply unit 400 provides a high-temperature source for enhancing the temperature of the concentrated water and the produced water through heat exchange with the concentrated water and the product water flowing into the first fresh water generating unit 100 and the membrane distillation unit 200, respectively As the apparatus, any one of a heat pump, a waste heat source supply unit 400 and a renewable energy supply unit 400 can be used. The renewable energy supply unit 400 uses energy generated by wind, geothermal, solar heat, tidal force, or wave power.

As shown in FIG. 6, a plurality of heat exchangers are provided, and for convenience of description, the respective heat exchangers will be referred to as first heat exchanger 510 to fourth heat exchanger 540.

The first heat exchanger (510) is an apparatus for heating a second concentrated water and a third concentrated water flowing from the first desalination unit (100) to flow into the membrane distillation unit (200), wherein the second concentrated water and the third And is provided at one side of the line through which the concentrated water flows. At this time, the temperatures of the second concentrated water and the third concentrated water flow through the first heat exchanger 510 in consideration of the limitations and productivity of the membrane of the membrane distillation unit 200, and are preferably improved to 20 ° C to 80 ° C, It is preferable that the second concentrated water and the third concentrated water whose temperature has been increased to 60 캜 are introduced into the membrane distillation unit 200.

The first heat exchanger 510 is connected to a line through which the second concentrated water flows and the line through which the third concentrated water flows and flows into one line, Respectively.

The second heat exchanger 520 is for heating seawater discharged after flowing through the membrane distillation unit 200 and flowing into the first desalination unit 100. The nanofiltration membrane 110 and the reverse osmosis membrane 120) through which the seawater flows.

The second heat exchanger 520 improves the temperature of the seawater to 10 ° C to 40 ° C, preferably 30 ° C, in consideration of limitations and productivity of the membrane of the nanofiltration membrane 110 before entering the nanofiltration membrane 110.

The third heat exchanger 530 is a device for heating the second produced water separated from the nanofiltration membrane 110 and flowing into the reverse osmosis membrane 120. The third heat exchanger 530 separates the nanofiltration membrane 110 from the nanofiltration membrane 110, 2 production water flow line.

The third heat exchanger 530 improves the temperature of the second produced water to 20 ° C to 50 ° C, preferably 40 ° C, in consideration of limitations and productivity of the membrane of the reverse osmosis membrane 120.

The fourth heat exchanger 540 is provided between the membrane distillation unit 200 and the second heat exchanger 520 for controlling the temperature of the seawater discharged from the membrane distillation unit 200 and the first concentrated water.

The fourth heat exchanger 540 is introduced at a high temperature through the first heat exchanger 510 to cool the temperature of the first concentrated water passing through the membrane distillation unit 200 and conversely to improve the temperature of the seawater. In this way, although the fourth heat exchanger 540 is shown as one heat exchanger in FIG. 6, it can be composed of two heat exchangers because it performs two functions of temperature reduction of the first concentrated water and temperature increase of the seawater. For convenience of explanation, each of the heat exchangers is referred to as a 4-1 heat exchanger and a 4-2 heat exchanger.

The fourth-fourth heat exchanger is a device for cooling the temperature of the first concentrated water discharged from the membrane distillation unit (200) to a high temperature and flowing into a second desalination unit, which will be described later, At this time, the 4-1 heat exchanger cools the temperature of the first concentrated water to 10 ° C to 30 ° C.

The fourth-to-second heat exchanger is a device for primarily improving the temperature of the seawater before entering the second heat exchanger (520).

The first heat exchanger 510 to the fourth heat exchanger 540 are connected to the high-temperature source supply unit 400 to receive the temperatures required for the first heat exchanger 510 to the fourth heat exchanger 540 . However, in order to efficiently use the high-temperature source supplied from the high-temperature source supply unit 400, as shown in FIG. 6, it is possible to configure the high-temperature source to sequentially flow from the heat exchanger, This configuration will be described in more detail as follows.

The third heat exchanger 530, the second heat exchanger 520, the fourth heat exchanger 530, and the fourth heat exchanger 530 are arranged in the order of temperature required by the first to fourth heat exchangers 510 to 540. [ The heat exchanger 540 needs a higher temperature in that order. Accordingly, the high heat source supplied from the high-temperature source supply unit 400 flows in the respective heat exchangers in the above-described order.

The high-temperature source supplied from the high-temperature source supply unit 400 is supplied to the first heat exchanger 510 to heat the second concentrated water and the third concentrated water. At this time, as described above, the lines for flowing the second concentrated water and the third concentrated water may flow respectively, and may flow in a single mixed state.

Accordingly, the high-temperature source supplied from the high-temperature source supply unit 400 flows through the two first heat exchangers 510 connected in parallel and flows through the second concentrated water and the third concentrated water through heat exchange with the second concentrated water and the third concentrated water. The temperature of the concentrated water is improved, and the temperature of the high heat source is decreased.

The high heat source having passed through the first heat exchanger 510 equipped to heat the second concentrated water of the two first heat exchangers 510 flows into the second heat exchanger 520 and flows into the second heat exchanger 510 relatively to the second concentrated water And then flows into the second heat exchanger 520 which improves the sea water to be improved to a low temperature. Since the seawater is improved to a relatively lower temperature than the second concentrated water, the temperature of the seawater can be sufficiently raised to an appropriate temperature even if a high heat source having a temperature lowered flows through the first heat exchanger 510.

The high heat source that has passed through the first heat exchanger 510 equipped to heat the third concentrated water flows into the third heat exchanger 530 and is heated to a relatively lower temperature than the third concentrated water, And then flows into the third heat exchanger 530 which improves the temperature. The second produced water is improved to a relatively lower temperature than the third concentrated water. Therefore, even when the high heat source having flowed through the first heat exchanger 510 and having the lowered temperature flows into the third heat exchanger 530, The temperature can be sufficiently raised to an appropriate temperature.

The high heat sources having improved the second heat exchanger 520 and the third heat exchanger 530 may be mixed together and directly flow into the high heat source supply unit 400 to reheat the high heat source.

However, in order to utilize the residual heat remaining in the high-temperature source, the fourth heat exchanger 540, preferably the fourth-second heat exchanger, may be firstly heated before the seawater passes through the second heat exchanger 520 . In this way, the high heat source that has passed through the fourth heat exchanger 540 flows through the respective heat exchangers and re-flows into the high heat source supply unit 400 for reheating the cooled high heat source.

Fourth Embodiment

7 and 8 are block diagrams of a desalination apparatus according to a fourth embodiment of the present invention. 7, the desalination apparatus 10 according to the fourth to sixth embodiments of the present invention includes a first desalination unit 100, a membrane distillation unit 200, and a dissolved substance extraction unit (not shown) 300).

Since the first desalination unit 100 and the membrane distillation unit 200 have the same structure as the above-described structures, the dissolved-substance extracting unit 300 will be mainly described in the following.

7 and 8, the dissolved substance extracting unit 300 is a unit for separating at least a portion of the first concentrated water discharged from the membrane distillation unit 200 into a dissolved substance extract and a fourth product water to be.

The dissolved substance extracting unit 300 may use various apparatuses for extracting dissolved substances, but may be an electrolytic water apparatus or a decontamination apparatus 310 such as a reduced pressure evaporator. Dissolved materials such as salts generated through the decontamination unit 310 can be separated and dried by using an apparatus such as an industrial centrifugal separator, a horizontal spray dryer, a hot air dryer, or the like.

Fifth Embodiment

9 is a configuration diagram of a desalination apparatus according to a fifth embodiment of the present invention. As shown in FIG. 9, the desalination apparatus 10 according to the fifth embodiment of the present invention has a configuration similar to that of the fourth embodiment as a whole.

The first desalination unit 100, the membrane distillation unit 200, and the decontamination apparatus 310 of the dissolved substance extraction apparatus according to the fifth embodiment have the same configurations as those of the fourth embodiment described above. However, the dissolved substance extraction apparatus includes a pressure retarded osmosis unit 320 and a forward osmosis unit 330 for use in salinity generation using the first concentrated water introduced from the membrane distillation unit 200, As shown in FIG.

In the present invention, the pressure-delayed osmotic agent 320 and the osmotic agent 330 are both provided for convenience of explanation. However, if necessary, the pressure-delayed osmotic agent 320 and the osmotic agent 330 But any one of them may be provided.

The pressure-delayed osmosis unit 320 is a device for generating electricity through salinity generation by flowing high-concentration first concentrated water discharged from the membrane distillation unit 200. The first concentrated water that has passed through the pressure delay osmotic device 320 may be introduced into the decontamination device 310 and reused.

The power produced through the pressure delay osmotic device 320 may be used to heat the high heat source in the high heat source supply 400.

The forward osmosis unit 330 separates the first concentrated water of high concentration into the sixth produced water and the fifth concentrated water by using a semipermeable membrane. The sixth produced water thus produced is discharged to the outside, and the fifth concentrated water flows into the decontamination unit 310.

Sixth Embodiment

10 is a configuration diagram of a desalination apparatus according to a sixth embodiment of the present invention. The desalination apparatus 10 according to the sixth embodiment of the present invention generally has a configuration similar to that of the fourth embodiment or the fifth embodiment described above. However, as shown in FIG. 10, it further includes a second desalination unit 400.

The second desalination unit 400 is a device for desalting the first concentrated water by introducing at least a part of the first concentrated water discharged from the membrane distillation unit 200, as shown in FIG. At this time, it is preferable that the first concentrated water is introduced into the first concentrated water whose temperature is lowered through heat exchange with seawater through the 4-1 heat exchanger as described above in order to reduce the weight of the second fresh water system.

The second desalination unit 400 may be any device capable of desalting the first concentrated water, but preferably uses an electrodialysis device.

The electrodialysis apparatus is an apparatus for concentrating desalination and salt by electrodialysis of a first concentrated water to a water tank in which a cation exchange membrane and an anion exchange membrane are alternately arranged. Whereby the first concentrated water is separated into the fifth production water and the fourth concentrated water.

The fifth produced water separated through the electrodialysis unit is discharged to the outside, and the fourth concentrated water flows into the dissolved substance extraction unit 300.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: Desalination unit
100: First Desalination Unit
110: nanofiltration membrane
120: reverse osmosis membrane
200: membrane distillation unit
300: Dissolved substance extraction unit
310: Decontamination device
320: Pressure Delayed Osmosis Device
330: Forward Osmosis Unit
400: second desalination unit
500: high heat source supply part
510: first heat exchanger
520: second heat exchanger
530; The third heat exchanger
540: fourth heat exchanger

Claims (17)

A first desalination unit separating the seawater into desalinated water and desalinated water; And
A membrane distillation unit into which the concentrated water separated from the first desalination unit is introduced and into which seawater for separating into the first concentrated water and the first produced water is introduced by cooling the concentrated water;
Wherein the seawater desalination apparatus comprises: The method according to claim 1,
Wherein the membrane distillation unit is connected to the first desalination unit to cool the concentrated water and to discharge the heated seawater to the first desalination unit. 3. The method of claim 2,
The first desalination unit includes:
A seawater desalination unit including a nanofiltration membrane for separating the seawater used as a cold source of the membrane distillation unit into the second produced water and the second concentrated water and flowing the second concentrated water to the membrane distillation unit, . The method of claim 3,
The first desalination unit includes:
Separating the second production water separated from the nanofiltration membrane into the third production water and the third concentrated water from which the salt is removed, and discharges the third production water to the outside, and the third concentrated water is discharged to the membrane distillation unit And a reverse osmosis membrane that flows into the desalination unit. 3. The method of claim 2,
The first desalination unit includes:
The seawater used as the cold source of the membrane distillation unit flows and flows and is separated into the third product water and the third concentrated water to discharge the third product water to the outside and the third concentrated water is discharged to the membrane distillation unit A seawater desalination apparatus comprising an incoming reverse osmosis membrane. The method according to claim 1,
Further comprising a heat pump unit for supplying heat to the first desalination unit,
Wherein the bottom pump unit comprises:
A high heat source; And
A first heat exchanger for separating the concentrated water from the first desalination unit and flowing into the membrane distillation unit, the high heat source recovering heat from the high-temperature source supply unit and flowing through the heat exchanger;
Further comprising a desalination unit for desalinating the seawater. 3. The method of claim 2,
Further comprising a heat pump unit for supplying heat to the first desalination unit,
Wherein the bottom pump unit comprises:
A high heat source; And
A second heat exchanger for circulating the seawater flowing from the membrane distillation unit to the first desalination unit through a heat exchanger,
Further comprising a desalination unit for desalinating the seawater. 3. The method of claim 2,
Further comprising a heat pump unit for supplying heat to the first desalination unit,
Wherein the bottom pump unit comprises:
A high heat source;
A first heat exchanger for separating the concentrated water from the first desalination unit and flowing into the membrane distillation unit, the high heat source recovering heat from the high-temperature source supply unit and flowing through the heat exchanger; And
A second heat exchanger for circulating the seawater flowing from the membrane distillation unit to the first desalination unit through a heat exchanger,
Further comprising a desalination unit for desalinating the seawater. The method of claim 8, wherein
Wherein the first heat exchanger and the second heat exchanger sequentially flow the high heat source. The method of claim 4, wherein
Further comprising a heat pump unit for supplying heat to the first desalination unit,
Wherein the bottom pump unit comprises:
A high heat source; And
A third heat exchanger for separating the second produced water separated from the nanofiltration membrane and flowing into the reverse osmosis membrane, wherein the high heat source recovered heat from the high heat source supply unit flows and heats the heat through the heat exchange;
Further comprising a desalination unit for desalinating the seawater. The method according to claim 1,
Further comprising a heat pump unit for supplying heat to the first desalination unit,
Wherein the bottom pump unit comprises:
A high heat source; And
A fourth heat exchanger for circulating the first concentrated water separated from the membrane distillation unit and the raw water through a heat exchanger,
Further comprising a desalination unit for desalinating the seawater. 3. The method of claim 2,
And a dissolved substance extraction unit for extracting dissolved substance from the first concentrated water discharged from the membrane distillation unit. 13. The method of claim 12,
Wherein the dissolved substance extracting unit comprises:
And a decontamination unit for separating and discharging the first concentrated water flowing into at least a part of the first concentrated water discharged from the membrane distillation unit to the fourth produced water and the dissolved substance. 13.
Wherein the dissolved substance extracting unit comprises:
Further comprising: a pressure delay osmosis device for introducing the first concentrated water discharged from the membrane distillation unit, using the first concentrated water for salinity difference generation, and then discharging the first concentrated water to a decontamination device. 14. The method of claim 13,
Wherein the dissolved substance extracting unit comprises:
The first concentrated water discharged from the membrane distillation unit flows into the sixth product water and the fifth concentrated water to discharge the sixth product water to the outside, and the fifth concentrated water is discharged to the decontamination unit Further comprising an osmotic device. 13. The method of claim 12,
At least a part of the first concentrated water flows and flows into the fifth product water and the fourth concentrated water to discharge the fifth product water to the outside and the fourth concentrated water to flow into the dissolved substance extraction unit And a second desalination unit. 17. The method of claim 16,
Wherein the second desalination unit is an electrodialysis unit.

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