TWM579642U - Smart seawater desalination circulation system - Google Patents

Abstract

The present invention provides a seawater desalination circulation system comprising a seawater collection unit, a heat flow guiding unit, a cold flow guiding unit and a desalination processing unit, the seawater collecting unit comprises at least one desalination collection chamber, and the heat flow guiding unit is configured to extract seawater and perform Heating to form a concentrated salt of high temperature water and introducing into the desalination collection chamber; the cold flow guiding unit is configured to extract seawater as a concentrated salt of low temperature water and generate a low temperature cooling water by heat exchange; the desalination treatment unit is configured to receive the low temperature cooling water After a demineralized distilled water is formed by using a temperature gradient difference from the high-temperature water of the concentrated salt, a part of the desalted distilled water is used as a low-temperature cooling water for the cooling cycle, and another part is provided for use or drinking. Thereby, seawater desalination can be performed on the hull without external energy consumption.

Description

Seawater desalination system

The present invention relates to a field of desalination technology, in particular to a desalination separation membrane for effectively removing seawater turbidity and a desalination circulation system using the desalination membrane.

Freshwater supplies have always been a challenge for vessels that need to work long-term at sea (cruises, fishing boats, etc.) because fresh water from the land requires a lot of space and consumes a lot of energy to carry large freshwater tanks. Another common option is to install reverse Osmosis (RO) on the fishing boat to desalinate seawater. However, RO requires high energy (10 kWh / m3) to push seawater through the reverse osmosis membrane (RO) to obtain clean water, and the reverse osmosis membrane is prone to scale and needs to be replaced frequently. The pure water preparation technology can be roughly divided into two methods, an evaporation method and a thin film method. The evaporation method generally uses heating to boil, and the water is evaporated and then coagulated to remove impurities such as heavy metals, pesticides, ions and dissolved solids in the water. Since the evaporation method needs to be carried out under boiling, the energy consumption cost is high and a large amount of heat energy is required, so it is often co-constructed with a thermal power plant, and the low-pressure steam discharged from the power plant steam turbine is used as an inexpensive heat source. In addition, if applied to large-scale desalination procedures, it also requires a large operating area.

The membrane-pure pure aquatic system is currently based on reverse osmosis and is a separation technique that uses pressure as a driving force. In the case of seawater, the salt concentration is high (the osmotic pressure is about 25 atm when the concentration is 3.5%). If the reverse osmosis operation of seawater desalination is to be carried out, the pressure should be more than 1 time higher than the osmotic pressure (about 50 to 60 atmospheres). ), so it is quite energy intensive. In recent years, with the development of thin film preparation and engineering application technology, combining the advantages of both the thin film method and the distillation method, thin film distillation has been gradually taken seriously.

At present, seawater desalination technology has been relatively mature, and the commonly used seawater desalination technology is mainly divided into evaporation method and membrane method. Both methods have their own advantages and limitations. The evaporation method is to evaporate seawater to obtain steam, and then to condense the steam into fresh water. The advantage is that the original seawater has low requirements, the pretreatment is simple, and the desalinated water has a low salt content. The limitation is that the seawater desalination process occurs. Phase change, large demand for heat, low seawater utilization rate, cooling water carrying heat away, etc.; thin film method is to use natural or synthetic polymer film, plus energy or chemical difference as a driving force, in seawater The salt and moisture leave to get fresh water. The advantage is that the whole process does not undergo phase change. Generally, no heating is required, the energy consumption is low, and the startup and shutdown are simple. The limitation is that seawater temperature fluctuation affects the membrane flux, and the pretreatment is strict and desalination. The water has a high salt content. According to the characteristics of two kinds of seawater desalination technologies, such as thermal method and membrane method, it can be seen that these two methods have certain complementarity. They are composed of hot film coupled seawater desalination technology, which can combine evaporation method and thin film desalination technology to form a film. Membrane Distillation (MD) method. However, Membrane Distillation (MD) is also one of the methods of seawater desalination, but due to the complicated design of commercially available membranes and the need to heat to provide heat flow, resulting in high energy consumption (8 kWh / m3) and high cost, not tall.

Therefore, how to improve the above-mentioned problems, the applicants have deliberately tried to solve the shortcomings of the conventional skills through careful experimentation and research, and a perseverance in view of the lack of the prior art.

In view of the problems of the prior art, the present invention provides a thin film distillation seawater desalination circulation system, which can provide a larger membrane area for more efficient production by providing water resources for the vessel, combined with a simple design and manufacture of a thin film distillation structure. Cooling water for drinking and system cooling cycles. In addition, a seawater desalination cycle system using available heat flow from the vessel (engine cooling water) and cold flow (for cooling cycles) is utilized without external energy consumption.

In order to achieve the purpose of the present invention, the present invention proposes a seawater desalination circulation system comprising a seawater collection unit, a heat flow guiding unit, a cold flow guiding unit and a desalination processing unit, the seawater collecting unit comprising at least one desalination collection chamber and The demineralization collection chamber has at least one water inlet passage; the heat flow guiding unit includes at least one heat flow conduit connected to the demineralization collection chamber and a heating assembly disposed on the heat flow conduit, the heat flow guiding unit is configured to extract seawater and The heating assembly heats the seawater to form a concentrated salt high temperature water, and the concentrated salt high temperature water is introduced into the desalination collection chamber through the water inlet channel; the cold flow guiding unit comprises a plurality of cold flow lines and a heat exchange storage tank for extracting seawater as a concentrated salt of low temperature water and transporting the concentrated salt low temperature water to the heat exchange storage tank for heat exchange by one of the cold flow lines Generating a cryogenic cooling water; the desalination treatment unit is disposed in the desalination collection chamber and includes at least one thin film distillation member and at least one condensation pipeline, the condensation pipeline system Disconnecting the thin film distillation member and the heat exchange storage tank, the thin film distillation member for receiving the low temperature cooling water derived from the other of the cold flow lines, and the concentrated salt high temperature water in the desalination collection chamber a difference in temperature gradient caused by a difference in vapor pressure to form a desalted distilled water which permeates into the interior of the thin film distillation member to form a desalted distilled water, and is sent to the heat exchange storage tank via the condensation line to The concentrated salt low-temperature water is subjected to heat exchange, and a part of the desalted distilled water is used as the low-temperature cooling water for the system to perform a cooling cycle, and another part is used for use or drinking; wherein the thin film distillation piece is made of a hydrophobic porous film To degrease the salt of the concentrated salt high temperature water in the desalting collection chamber.

According to an embodiment of the present invention, there is further included a fresh water tank disposed at a downstream end of the heat exchange storage tank for receiving the demineralized distilled water from the heat exchange storage tank for use or drinking.

According to an embodiment of the present invention, the film distillation member is made of Teflon (PTFE), polyvinyl alcohol (PVA) or polypropylene (PP).

According to an embodiment of the present invention, the average size of the pores of the thin film distillation member is in the range of 0.1 μm to 1 μm.

According to an embodiment of the present invention, the temperature gradient difference is in the range of 15 ° C to 50 ° C.

According to an embodiment of the present invention, the heat exchange storage tank comprises an inner tank body and an outer tank body disposed outside the inner tank, the inner tank body is connected to the condensation pipeline to receive the desalted distilled water, the inner tank The body and the outer tank body are not in communication with each other and an accommodating space is formed therebetween to accommodate the concentrated salt low-temperature water from seawater, and the relatively low-temperature concentrated salt low-temperature water and the relatively high-temperature desalted distilled water are separated from each other. The inner tank body initiates heat exchange to cool the desalted distilled water to form the low temperature cooling water.

According to an embodiment of the present invention, the plurality of thin film distillation members are plural, and each of the two sides of the thin film distillation member is respectively provided with a communication tube, wherein the communication tube on one side is connected to one of the cold flow lines to receive The low-temperature cooling water of the cold flow guiding unit is connected to the condensation line on the other side to transport the desalted distilled water.

According to an embodiment of the present invention, there is further included an air blowing device that communicates with the desalination collection chamber to provide convective gas of the desalination collection chamber.

According to an embodiment of the present invention, the heating assembly is at least one selected from the group consisting of a solar panel, a heater, a heating coil, an engine unit of a hull, and combinations thereof, and the concentrated salt high temperature water has a temperature of at least 60 °C.

In the following, in conjunction with the drawings and the preferred embodiment of the present invention, the technical means adopted by Bentron as a purpose for achieving the desired creation are further explained, and the detailed description and technical contents of the creation are provided. The drawings are only for reference and explanation. It is not intended to limit the creation of this creation. In the following description of the present writing, the orientation or positional relationship of the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is to be understood that the description of the present invention is merely for the convenience of the description, and is not intended to limit the scope of the present invention.

Please refer to FIG. 1 , which depicts the architecture of the seawater desalination cycle system of the present invention. Firstly, the seawater desalination cycle system described in this creation is mainly applied to various vessels that are still in operation, such as fishing boats, cruise ships, etc., but not limited thereto, and may be placed anywhere on the ground adjacent to the ocean. a system for desalination of seawater for the user to use or drink water desalinated from the ocean; and the position or relative position of each component in the drawing (upper, lower, left, and right relative positions) It is not an actual configuration, it is only used to illustrate the use of this creative technique, and is not limited by this; the dotted line in the figure indicates the direction of the fluid. In a specific embodiment, the seawater desalination cycle system described in the present invention is exemplified as being disposed on the hull, and includes: a seawater collecting unit 10, a heat flow guiding unit 20, a cold flow guiding unit 30, and a Desalination treatment unit 40.

The seawater collecting unit 10 includes at least one desalination collection chamber 12 and the desalination collection chamber 12 is provided with at least one water inlet passage 11. In a specific embodiment, the volume and quantity of the desalination collection chamber 12 are based on the hull (not shown). Space and actual desalination treatment efficiency are considered. Although there are two shown in the figure, it is not limited to this. Furthermore, since the desalination collection chamber 12 needs to accommodate a large amount of high-concentration salt seawater extracted from the sea, rust-preventing treatment can be performed on the inner wall surface.

The heat flow guiding unit 20 includes at least one heat flow line 21 connected to the desalination collection chamber 12 and a heating assembly 22 disposed on the heat flow line 21, and the heat flow guiding unit 20 is configured to extract the ocean sw through an extraction device 50. The seawater is heated by the heating unit 22 to a predetermined temperature to form a concentrated salt high temperature water sw1, and the concentrated salt high temperature water sw1 is introduced into the desalting water via the water inlet passage 11 by the heat flow line 21 In the collection chamber 12; wherein the extraction device 50 can be a lift pump.

According to an embodiment of the present invention, the heating assembly 32 is an engine device of the hull, and the concentrated salt high temperature water sw1 is taken from the cooling water required for the operation of the engine, and the extracted seawater is used as the cooling water for the engine operation. And heating to the preset temperature, and the preset temperature is at least 60 ° C or above.

According to an embodiment of the present invention, a filter device 60 may be further disposed on the heat flow line 21 between the ocean and the extraction device 50 to filter impurities in the seawater.

The cold flow guiding unit 30 includes a cold flow conduit 31, 31' and a heat exchange storage tank 32, and the cold flow guiding unit 30 extracts deep seawater in the ocean sw through the extraction device 50 (relatively low temperature seawater farther away from sea level) And through one of the cold flow lines 31, one of the deep seawater low-concentration water sw2 is sent to the heat exchange storage tank 32 for heat exchange to generate a low-temperature cooling water cw for extracting The apparatus 50 is delivered to a thin film distillation member 41 as described below.

In a specific embodiment, the heat exchange storage tank 32 includes an inner tank body 321 and an outer tank body 322 disposed outside the inner tank body 321 . The inner tank body 321 is connected to the condensing line 22 to receive the desalted distilled water. Fw2, the inner tank body 321 and the outer tank body 322 are not in communication with each other and an accommodating space 320 is formed therebetween to accommodate the concentrated salt low temperature water sw2 extracted from the seawater by the cold flow guiding unit 30, and relatively low temperature The concentrated salt low-temperature water sw2 and the relatively high-temperature demineralized distilled water fw2 are heat-exchanged with each other via the inner tank body 321, so that the desalted distilled water fw2 is cooled (or condensed) to form the low-temperature cooling water cw.

The desalination treatment unit 40 is respectively disposed in each of the desalination collection chambers 12. The desalination treatment unit 40 includes a plurality of membrane distillation members 41 and n, and at least one condensation line 42 that communicates with the membranes respectively. a distillation member 41 and the heat exchange storage tank 22 for receiving the low temperature cooling water cw derived from the other of the cold flow lines 31', and which is concentrated with the demineralization collection chamber 12 The difference in temperature gradient between one of the high temperature water w1 causes a vapor pressure difference to form a desalted steam which permeates into the inside of the thin film distillation member and cools to form the desalted distilled water fw2, and then is sent to the decondensed distilled water fw2 through the condensation line 42 The inner tank body 321 in the heat exchange tank 32 exchanges heat with the concentrated salt low temperature water sw2 in the accommodating space 320 to generate a desalted distilled water fw2, and the part of the desalted distilled water fw2 is used as the low temperature cooling water cw The system is subjected to a cooling cycle, and another portion may be used as a clean water uw for use or drinking; wherein the film distillation member 41 is made of a hydrophobic porous film to degrease the concentrated salt in the desalination collection chamber 12. high temperature sw1 salt. The clear water uw for use or drinking can be placed in the fresh water tank 80 disposed at the downstream end of the heat exchange storage tank 32.

According to the above, the microporous and hydrophobic film (hydrophobic porous film) can separate the fluids at different temperatures on both sides, and the temperature difference between the two sides of the film causes a vapor pressure difference, which is driven by the pressure difference. The force causes the vapor molecules to diffuse through the pores of the membrane to the cold side end, which is then cooled and collected by a cold fluid or other condensing device. In general, as long as the inflow of the thin film distillation (the above-mentioned concentrated salt high-temperature water sw1) is heated to 50 ° C or more to make a temperature difference of more than 20 ° C with both sides of the low-temperature cooling water cw in the film, sufficient steam can be generated. The pressure difference causes the velocity of the vapor to pass through the film to meet the requirements of engineering applications; according to an embodiment of the present invention, the preset temperature is at least 40 ° C or higher; preferably, the preset temperature is at least 60 ° C or higher.

According to an embodiment of the present invention, the temperature gradient difference is in the range of 15 ° C to 50 ° C.

According to an embodiment of the present invention, a connecting tube (not shown) is respectively disposed on two sides of the body of the thin film distillation member 41, wherein the connecting tube on one side is connected to one of the cold flow lines 31'. The low-temperature cooling water cw received from the cold flow guiding unit 30 is connected to the condensing line 42 to transport the desalted distilled water fw2.

According to an embodiment of the present invention, there is further included an air blowing device 70 that communicates with the desalination collection chamber 12 for providing a convective gas of the desalination collection chamber 12 such that the heat flow is completely mixed and passes through the thin film distillation member 41. Enhance water vapor and reduce film contamination.

It is added that the membrane with high hydrophobicity, the liquid will not penetrate and only gas molecules will pass through the pores of the membrane, and the membrane itself is only a support for achieving liquid-vapor equilibrium between the liquid and the membrane. At present, there are many sports clothes with waterproof and breathable function. There is a layer of hydrophobic porous film inside the material. For example, GORE-TEX film for commercial applications, rainwater can not penetrate ORE-TEX materials, but the sweat discharged from the body is easy to pass through the small holes. The porosity is up to 90%, and the pore size is 700 times larger than the water vapor molecule. This material is not easy to penetrate water. The affinity/hydrophobicity of the membrane material is generally determined by the contact angle size, and the droplet measurement method is used to observe the contact angle image of the water droplet from the surface of the film. The greater the contact angle, the higher the hydrophobicity of the film; Conversely, if the contact angle is smaller, the hydrophilicity of the film is higher. Generally, the contact angle is greater than 90° for the hydrophobic surface, and conversely for the hydrophilic surface, and the Teflon film contact angle without modification is often more than 120°, so it has high hydrophobicity.

The pore size of the thin film distillation is usually 0.1 to 0.6 μm. When the pore diameter is too large, the liquid easily penetrates into the pores, and the pore size is too small to increase the transport resistance of the vapor molecules in the membrane. Since the vapor flux is proportional to the membrane porosity, high porosity (40~85%) is an important physical property of the film used for this operation; due to the need to separate high and low temperatures, the film needs to have low thermal conductivity (reducing the prevention of both sides of the film) Heat loss and chemical stability are also considered in order to cope with high temperature and wastewater pollution problems.

According to an embodiment of the present invention, the thin film distillation member 41 is made of high hydrophobic porous material made of Teflon (PTFE), polyvinyl alcohol (PVA), difluoroethylene (PVDF) or polypropylene (PP). The film member body; lowerly, the film distillation member 41 is made of Teflon (PTFE), which has excellent hydrophobic properties and high chemical stability.

According to the condensation mode of the thin film distillation member 41 on the low temperature water producing side, the thin film distillation is generally roughly divided into four operation modes: Direct Contact Membrane Distillation (DCMD), Air Gap Membrane Distillation (AGMD). ), Sweep Gas Membrane Distillation (SGMD) and Vacuum Membrane Distillation (VMD).

The direct contact type (DCMD) is a cooling water with a relatively high temperature inlet and a permeate end, which are in direct contact with the film on both sides of the film, and flow in the same direction or in the opposite direction, and the vapor molecules diffuse through the membrane channel to the low temperature permeate end. And collect it directly by condensation. At present, about 80% of the research on thin film distillation belongs to this operation module. The advantage is that the mold assembly has a simple structure, and since both liquids are in direct contact with the film, the heat transfer in the module flow channel and the resistance of the mass transfer are small, so The vapor transmission rate is large, but the membrane heat conduction loss is also relatively high, resulting in lower thermal efficiency.

The difference between air gap type (AGMD) and direct contact type (DCMD) is that the liquid at the osmotic end is not in direct contact with the film, but a condensing heat exchange surface is disposed therein. After the vapor molecules pass through the film, they still pass through an air gap. Diffused to the condensing plate to condense into droplets. Since the film is not in direct contact with the cooling liquid, the heat loss of the film conduction can be reduced, and the condensed liquid can be directly collected and utilized without mixing with the cooling fluid, so the application range is wide, and it has been successfully used for pure water production and concentration. Non-volatile solution. However, the disadvantage is that this air gap is increased, which will increase the mass transfer resistance of the vapor molecules as a whole, and the flux is often significantly lower than the direct contact type.

The gas sweep type (SGMD) changes the liquid at the permeate end to a flowing gas. When the vapor molecules diffuse through the pores of the membrane, they are then taken away by the inert gas that is swept away and collected by condensation through an external device. This method is suitable for removing thin particles. Volatile substances in the solution. Although the permeation flux of this operation is large and the conduction heat loss of the membrane is smaller than the above two operation modules, the procedure needs to be designed with an external condenser, and the equipment cost is high.

The vacuum type (VMD) is similar to the gas sweep type, but it is not a cryogenic fluid on the other side of the membrane, but evacuates the vapor by vacuuming and condenses the water vapor outside the module. This operation can be maintained high. The difference in vapor pressure and the elimination of non-condensable gas (air) in the pores of the membrane reduces the mass transfer resistance of the vapor in the pores of the membrane, which contributes to the improvement of the permeate flux, and the disadvantage is that a vacuum pump is required to maintain a stable vacuum. With negative pressure extraction, the required energy consumption may be higher, and therefore the vapor pressure difference that the operation can provide is large, and the risk of the membrane pores being wetted by the feed liquid is also high. This procedure can be used to extract soluble gases or to remove volatiles from thin solutions, in addition to water treatment.

Accordingly, the present invention proposes an embodiment of a thin film distillation member based on a seawater desalination cycle system, as shown in FIG. In the present embodiment, the thin film distillation member P1 is made of a hydrophobic porous film and is made of one selected from the group consisting of Teflon (PTFE), polyvinyl alcohol (PVA), and polypropylene (PP). A plurality of film holes P10 are distributed on the surface. The thin film distillation member P1 is designed as a body structure in a direct contact type (DCMD) operation mode. The average size of the pores of the thin film distillation member P1 is in the range of 0.1 μm to 1 μm; preferably, the average size of the pores is in the range of 0.4 μm to 1 μm. The two sides of the film structure of the film distillation member P1 are respectively provided with a communication port P11, and a sealing mouth P12 is respectively provided at the upper and lower ends to seal the body. Referring to FIG. 4, an embodiment of the application of the thin film distillation member P1 of FIG. 2 is shown.

The present invention further proposes another embodiment of a thin film distillation member based on a seawater desalination cycle system, as shown in Figures 3a to 3b. In the present embodiment, the film distillation member P2 is formed to include a diaphragm P21 and a serpentine flow path base P22. The diaphragm P21 is made of a hydrophobic porous film and is made of a material selected from the group consisting of Teflon (PTFE). Or one of polyvinyl alcohol (PVA) or polypropylene (PP), a plurality of film pores P210 are distributed on the surface of the membrane P21 and the serpentine flow path base P22 is coated. The film distillation member P2 is designed in a direct contact (DCMD) operation mode. The average size of the pores of the seawater desalination membrane P21 is in the range of 0.1 μm to 1 μm; preferably, the average pore size is in the range of 0.4 μm to 1 μm. The two sides of the serpentine flow path base P22 respectively have a communication port P220, and the size of the flow channel geometry in the serpentine flow path base P22 varies according to the actual application, and is not limited herein.

In summary, the sea tax desalination cycle system described in the present invention utilizes heat flow and cold flow from the vessel itself to reduce energy consumption, allowing wastewater or seawater to permeate through the system, and may be provided according to the size of the hull space. A plurality of independently operated desalination collection chambers continuously produce desalinated fresh water more efficiently. The form of the film distillation member is not particularly limited, and may be a bag type, a sheet shape, a cylindrical shape, a hollow drum type or the like, as long as it can generate a large amount of fresh water for the vessel. In addition, the heat flow comes from the cooling water of the engine, which is used to cool the seawater of the engine. After the engine is heated, the temperature reaches up to 60 °C and enters the desalination collection chamber, and the water vapor permeates through the thin film distillation body to permeate the demineralized distilled water, while the cold current flows from the deep sea. The water is pumped and exchanged with the pumped heat exchange system to produce cryogenic cooling water as a system cooling cycle and fresh water for drinking. Furthermore, the blasting device is more designed to completely mix the heat flow and through the thin film distillation body to enhance water vapor and reduce film contamination.

However, the specific embodiments described above are only used to illustrate the features and functions of the present invention, and are not intended to limit the scope of implementation of the present invention, without departing from the spirit and technical scope of the creation. The equivalent changes and modifications made by the present disclosure are still covered by the scope of the patent application described below.

10‧‧‧Seawater collection unit

11‧‧‧Water inlet channel

12‧‧‧Desalting collection room

20‧‧‧Heat flow guide unit

21‧‧‧Hot flow line

22‧‧‧heating components

30‧‧‧Cold flow guiding unit

31, 31’‧‧‧ cold flow piping

32‧‧‧Heat exchange tank

320‧‧‧ accommodating space

321‧‧‧ inner tank

322‧‧‧ outer trough body

40‧‧‧Desalting unit

41‧‧‧film distillation parts

42‧‧‧Condensation line

50‧‧‧ pumping device

60‧‧‧Filter device

70‧‧‧Blowing device

80‧‧‧light sink

Sw1‧‧‧Concentrated salt high temperature water

Sw2‧‧‧Concentrated salt low temperature water

Fw2‧‧‧desalted distilled water

Cw‧‧‧Cryogenic cooling water

P1‧‧‧film distillation parts

P10‧‧‧ film hole

P11‧‧‧Connected

P12‧‧‧ Seal

P2‧‧‧film distillation parts

P21‧‧‧ diaphragm

P210‧‧‧ film hole

P22‧‧‧Snake channel base

P220‧‧‧Connecting port

Figure 1 is a system architecture diagram showing the seawater desalination system of the present invention. Fig. 2 is a schematic view showing the appearance of an embodiment of the film distillation member of the present invention. 3a-3b are schematic views showing the appearance of another embodiment of the film distillation member of the present invention. Fig. 4 is a view showing the application of the film distillation member of Fig. 2 of the present invention.

Claims (10)

A seawater desalination cycle system comprising: a seawater collection unit comprising at least one desalination collection chamber and the desalination collection chamber having at least one inlet passage; a heat flow guiding unit comprising at least one heat flow conduit connecting the desalination collection chamber a heating assembly disposed on the heat flow conduit, the heat flow guiding unit is configured to extract seawater, and the heating assembly heats the seawater to form a concentrated salt high temperature water, and the hot water pipeline passes the water inlet passage through the water inlet passage The concentrated salt high temperature water is introduced into the desalination collection chamber; a cold flow guiding unit comprises a plurality of cold flow conduits and a heat exchange storage tank, wherein the cold flow guiding unit is configured to extract seawater as a concentrated salt of low temperature water and a cold flow line conveying the concentrated salt low temperature water to the heat exchange storage tank for heat exchange to generate a low temperature cooling water; and a desalination treatment unit disposed in the desalination collection chamber and including at least one thin film distillation piece And the at least one condensation line, the condensation line is respectively connected to the thin film distillation piece and the heat exchange storage tank, and the thin film distillation piece is received from another cold flow line The low temperature cooling water, and a difference in temperature gradient between the temperature gradient of the concentrated salt and the high temperature water in the demineralization collection chamber generates a demineralized water vapor, and the demineralized water vapor permeates into the inner portion of the thin film distillation member to form a temperature. Distilling distilled water and transporting it to the heat exchange storage tank via the condensation line to exchange heat with the concentrated salt low temperature water for demineralized distilled water, and a part of the desalted distilled water is used as the low temperature cooling water for the system to perform a cooling cycle, and Another portion is provided for use or for drinking; wherein the thin film distillation member is in the form of a bag, a sheet, a cylinder, a hollow drum or other form. The seawater desalination cycle system of claim 1, wherein the temperature gradient difference is in the range of 15 ° C to 50 ° C. The seawater desalination cycle system of claim 1, further comprising a fresh water tank disposed at a downstream end of the heat exchange storage tank for receiving the demineralized distilled water from the heat exchange storage tank for Use or drink. The seawater desalination cycle system of claim 1, wherein the heat exchange storage tank comprises an inner tank body and an outer tank body disposed outside the inner tank, the inner tank body connecting the condensation pipeline to receive the desalination Distilled water, the inner tank body and the outer tank body are not in communication with each other and an accommodating space is formed therebetween to accommodate the concentrated salt low-temperature water from seawater, and the concentrated salt low-temperature water and the relatively high temperature of the low-temperature water are relatively low temperature The distilled water initiates heat exchange interaction with each other through the inner tank body to cool the desalted distilled water to form the low-temperature cooling water desalted distilled water. The seawater desalination cycle system of claim 1, wherein the film distillation member is plural, and each of the two sides of the film distillation member is respectively provided with a communication tube, wherein the communication tube on one side is connected to one of the cold currents. The pipeline receives the cryogenic cooling water from the cold flow guiding unit, and the communication pipe on the other side is connected to the condensation pipeline to deliver the desalted distilled water. The seawater desalination cycle system of claim 1, further comprising an air blowing device connected to the desalination collection chamber for providing a convection gas of the desalination collection chamber. The seawater desalination cycle system according to claim 1, wherein the heating component is at least one selected from the group consisting of a solar panel, a heater, a heating coil, an engine device of a hull, and a combination thereof, and a temperature of the concentrated salt high temperature water. At least 60 ° C. The seawater desalination cycle system of claim 1, wherein the film distillation member is made of Teflon (PTFE), polyvinyl alcohol (PVA) or polypropylene (PP). The seawater desalination cycle system according to claim 1, wherein the average pore size of the thin film distillation member is in the range of 0.1 μm to 1 μm. The seawater desalination cycle system of claim 1, wherein the film distillation member is a direct contact Membrane Distillation (DCMD) hydrophobic porous film.