A system and method for desalinating seawater using circulating cooling water

Abstract

The present invention discloses a system and method for desalinating seawater using circulating cooling water. The system includes a cooling tower, and a seawater pool, an air inlet layer, a packing layer, a spray layer, a freshwater collection layer, and a condensation layer, arranged sequentially in the cooling tower from bottom to top. In the method, mist water sprayed from the spray layer sequentially passes through the packing layer and the air inlet layer and converges into the seawater pool. Air entering from the air inlet layer flows upward in the cooling tower, sequentially passing through the packing layer and the spray layer. After the upward-flowing air contacts the downward-flowing water mist in the packing layer and the spray layer, some water evaporates, and the water vapor forms a vapor stream with the upward-flowing airflow. The vapor stream continues to flow upward, passing through the freshwater collection layer and the condensation layer. Steam in the vapor stream condenses in the condensation layer, forming water droplets, which converge downward in the freshwater collection layer. The present invention achieves desalination of seawater using circulating cooling water.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal power generation and seawater desalination, and particularly relates to a system and method for desalinating seawater using circulating cooling water. Background Art

[0002] In thermal power generation technologies such as nuclear power and thermal power, the steam after the turbine has done work needs to be cooled and condensed into water in the condenser using cold water. Seawater is one of the main sources of cold water.

[0003] Direct seawater cooling requires thermal power generation to be built on the seashore, which will cause certain thermal pollution to the ocean. In addition, with the development of industry, the sites suitable for building power stations on the seashore are becoming increasingly scarce. In subsequent thermal power plants, direct seawater cooling is used less and less, while seawater circulation cooling is used more and more.

[0004] The principle of seawater circulation cooling is that after absorbing heat from the turbine exhaust steam in the condenser, the seawater's temperature rises, forming high-temperature seawater. This hot seawater then enters the upper spray layer of the cooling tower, where it forms a mist of droplets that fall. Coming into contact with the rising airflow from the lower portion of the cooling tower, some of the water in the droplets evaporates. As evaporation absorbs heat, the droplet temperature drops, ultimately cooling the high-temperature seawater from the condenser to form low-temperature seawater. Currently, the temperature difference between the high-temperature and low-temperature seawater is approximately 10°C. The evaporated water from the droplets forms steam, which, combined with the rising air from below, forms a vapor flow that is discharged from the top of the cooling tower into the atmosphere. A 1000MW thermal power unit using seawater circulation cooling technology exhausts approximately 5000 tons / h of steam from the cooling tower. This steam eventually dissipates into the surrounding environment, causing some pollution.

[0005] At the same time, thermal power plants require a large amount of fresh water in addition to cold source water. Coastal power plants generally use seawater desalination to obtain fresh water. Summary of the Invention

[0006] Aiming at the existing problems of seawater circulation cooling in coastal thermal power plants and the need to obtain fresh water through seawater desalination, the present invention provides a system and method for desalinating seawater using circulating cooling water.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A system for desalinating seawater using circulating cooling water comprises a cooling tower, and a seawater pool, an air inlet layer, a filler layer, a spray layer, a freshwater collection layer, and a condensation layer arranged in sequence from bottom to top in the cooling tower;

[0009] The mist water sprayed from the spray layer passes through the packing layer and the air inlet layer in turn and converges into the seawater pool;

[0010] The air entering from the air inlet layer flows upward in the cooling tower, passing through the fill layer and the spray layer in sequence;

[0011] After the upward-flowing air contacts the downward-flowing water mist in the packing layer and the spray layer, part of the water evaporates, and the water vapor forms a vapor flow with the upward-flowing air flow. The vapor flow continues to flow upward, passing through the fresh water collection layer and the condensation layer. The steam in the vapor flow condenses in the condensation layer to form water droplets, which converge downward in the fresh water collection layer.

[0012] A further improvement of the present invention is that space for installation and maintenance is left between the seawater pool, the air inlet layer, the filler layer, the spray layer, the fresh water collection layer and the condensation layer.

[0013] A further improvement of the present invention is that it also includes a seawater replenishment device and a concentrated water discharge device.

[0014] The outlet of the seawater replenishing device is connected to the first inlet of the seawater pool, and the first outlet of the seawater pool is connected to the inlet of the concentrated water discharging device.

[0015] A further improvement of the present invention is that it also includes a circulating water pump and a cooling water pump;

[0016] The second outlet of the seawater pool is connected to the inlet of the cooling water pump, the third outlet of the seawater pool is connected to the inlet of the circulating water pump, the outlet of the cooling water pump is connected to the inlet of the condensation layer, and the outlet of the condensation layer is connected to the first inlet of the spray layer.

[0017] A further improvement of the present invention is that it further comprises a concentrated water user, a condenser, a secondary purification device and a fresh water user;

[0018] The outlet of the concentrated water discharge device is connected to the concentrated water user inlet, the outlet of the circulating water pump is connected to the inlet of the condenser, the outlet of the condenser is connected to the second inlet of the spray layer, the outlet of the fresh water collection layer is connected to the inlet of the secondary purification device, and the outlet of the secondary purification device is connected to the inlet of the fresh water user.

[0019] A further improvement of the present invention is that the condensation layer is composed of finned tubes with upward bends.

[0020] A further improvement of the present invention is that the inlet of the condensation layer is connected to the tube inlet of the finned tube, and the seawater with a lower temperature from the outlet of the cooling water pump flows through the tube of the finned tube; the finned tubes are arranged in at least two layers, and the fins of the finned tubes in the same layer have gaps for gas to pass through; the two layers of finned tubes are staggered, that is, the gaps between the fins of the finned tubes in the lower layer are directly opposite to the tubes of the finned tubes in the upper layer; the gas flow flowing upward from the fresh water collection layer condenses to form condensed water after passing through the outside of the finned tubes with a lower temperature; water flow holes are left at the roots of the fins, and the condensed water gathered on the upper part of the fins falls downward into the fresh water collection layer; the outlet of the condensation layer is connected to the tube outlet of the finned tube, and the seawater coming out of the outlet of the condensation layer enters the first inlet of the spray layer.

[0021] A further improvement of the present invention is that the fresh water collection layer is composed of a plurality of wind hoods.

[0022] A further improvement of the present invention is that the gas flow enters the wind hood from the bottom, turns and then flows out of the wind hood. During the turning process, some droplets fall into the fresh water collection layer; the droplets condensed from the condensation layer fall on the upper part of the wind hood and flow into the fresh water collection layer; the condensed water and separated water collected in the fresh water collection layer enter the secondary purification device from the outlet of the fresh water collection layer.

[0023] A method for desalinating seawater using circulating cooling water, based on the system for desalinating seawater using circulating cooling water, comprises:

[0024] The seawater in the seawater pool is pumped through a circulating water pump to increase its pressure head. After entering the condenser and exchanging heat with the exhaust steam of the steam turbine, the temperature rises and forms high-temperature seawater.

[0025] The high-temperature seawater passes through the condenser and enters the spray layer, forming mist water;

[0026] As the mist water drips downward, it comes into contact with the upward flowing air, causing part of the water to evaporate and the seawater to be condensed to form concentrated seawater.

[0027] Water absorbs heat during the evaporation process, which will lower the temperature of the concentrated seawater and form low-temperature concentrated seawater;

[0028] Low-temperature concentrated seawater is collected in the seawater pool;

[0029] The seawater in the seawater pool enters the condensation layer through the cooling water pump, which reduces the temperature of the condensation layer. The steam generated in the packing layer and the spray layer condenses into fresh water droplets after passing through the condensation layer with lower temperature. The fresh water droplets are collected in the fresh water collection layer.

[0030] The fresh water from the fresh water collection layer flows into the secondary purification device and is further processed according to the needs of fresh water users to form fresh water that meets the needs of fresh water users;

[0031] The seawater discharged from the condensation layer enters the spray layer from the first inlet of the spray layer;

[0032] When the salt content of seawater in the seawater pool reaches a predetermined value, part of the concentrated seawater is discharged through the concentrated water discharge device and then sent to the concentrated water user, who can further utilize the seawater with a higher salt content.

[0033] The seawater in the seawater pool is partially evaporated and partially discharged, the water level drops, and the seawater is replenished through the seawater replenishment device to reach the normal water level.

[0034] The present invention has at least the following beneficial technical effects:

[0035] The present invention provides a system and method for desalinating seawater using circulating cooling water. By adding a condensation layer and a fresh water collection layer to the upper part of a circulating cooling tower, most of the steam discharged into the atmosphere can be condensed and collected, thereby saving water resources and reducing pollution to the surrounding environment. For seawater circulating cooling technology, the steam formed by evaporation of seawater in the circulating tower has a low salt content, and the water produced by the condensation of the steam is fresh water. Collecting this fresh water in the fresh water collection layer achieves the desalination of seawater. By adding the condensation layer, most of the steam is condensed, reducing the air pressure in the upper part of the cooling tower, accelerating the air flow rate rising from the bottom of the cooling tower, enhancing the cooling effect of the cooling tower, and achieving a lower seawater temperature. Therefore, the capacity of the circulating water pump can be reduced, reducing investment and operating costs.

[0036] Furthermore, the capacity of the cooling water pump added by the present invention almost offsets the reduced capacity of the circulating water pump, so there is no need to increase investment costs and operating costs.

[0037] Furthermore, the desalination process of seawater actually utilizes the waste heat of the generator set, does not require additional energy, does not require water treatment membranes, and requires very little human operation, so the operating costs are low.

[0038] Furthermore, the fresh water collection layer is located at the upper part of the cooling tower, which is at a higher position and can reach users in a passive manner. Secondary treatment only requires a small amount of cost to achieve higher water quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a structural block diagram of a system for desalinating seawater using circulating cooling water according to the present invention.

[0040] Figure 2 Schematic diagram of the structure of the condensation layer of the present invention.

[0041] Figure 3 Schematic diagram of the structure of the fresh water collection layer of the present invention.

[0042] Description of reference numerals:

[0043] 1. Seawater pool, 2. Air inlet layer, 3. Filling layer, 4. Spray layer, 5. Fresh water collection layer, 6. Condensation layer, 7. Secondary purification device, 8. Fresh water user, 9. Seawater replenishment device, 10. Concentrated water discharge device, 11. Concentrated water user, 12. Cooling tower, 13. Circulating water pump, 14. Condenser, 15. Cooling water pump. DETAILED DESCRIPTION

[0044] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0047] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0050] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0051] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0052] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] like Figure 1 As shown, the present embodiment provides a system for desalinating seawater using circulating cooling water, comprising a cooling tower 12, and a seawater pool 1, an air inlet layer 2, a packing layer 3, a spray layer 4, a freshwater collection layer 5, and a condensation layer 6 arranged in sequence from bottom to top in the cooling tower 12; the mist water sprayed from the spray layer 4 sequentially passes through the packing layer 3 and the air inlet layer 2 and converges into the seawater pool 1; the air entering from the air inlet layer 2 flows upward in the cooling tower 12, passing through the packing layer 3 and the spray layer 4 in sequence; after the upward-flowing air contacts the downward-flowing water mist in the packing layer 3 and the spray layer 4, part of the water evaporates, and the water vapor forms a vapor flow with the upward-flowing air flow, which continues to flow upward, passes through the freshwater collection layer 5 and the condensation layer 6, and the steam in the vapor flow condenses in the condensation layer 6 to form water droplets, which converge downward in the freshwater collection layer 5.

[0055] Example 2

[0056] like Figure 1 As shown, this embodiment provides a system for desalinating seawater using circulating cooling water, including a seawater pool 1, an air inlet layer 2, a packing layer 3, a spray layer 4, a fresh water collection layer 5, a condensation layer 6, a secondary purification device 7, a fresh water user 8, a seawater replenishment device 9, a concentrated water discharge device 10, a concentrated water user 11, a cooling tower 12, a circulating water pump 13, a condenser 14 and a cooling water pump 15.

[0057] The seawater pool 1, air inlet layer 2, packing layer 3, spray layer 4, fresh water collection layer 5, and condensation layer 6 are arranged in sequence from bottom to top in the cooling tower 12, with a certain amount of space left between each layer for installation and maintenance. The mist water sprayed from the spray layer 4 passes through the packing layer 3 and the air inlet layer 2 in sequence and converges into the seawater pool 1. The air entering from the air inlet layer 2 flows upward in the cooling tower 12, passing through the packing layer 3 and the spray layer 4 in sequence. After the upward-flowing air contacts the downward-flowing water mist in the packing layer 3 and the spray layer 4, part of the water evaporates, and the water vapor forms a vapor flow with the upward-flowing air flow. The vapor flow continues to flow upward, passes through the fresh water collection layer 5 and the condensation layer 6, and the steam in the vapor flow condenses in the condensation layer 6 to form water droplets, which converge downward in the fresh water collection layer 5.

[0058] The outlet of the seawater replenishment device 9 is connected to the first inlet of the seawater pool 1, the third outlet of the seawater pool 1 is connected to the inlet of the circulating water pump 13, the second outlet of the seawater pool 1 is connected to the inlet of the cooling water pump 15, the first outlet of the seawater pool 1 is connected to the inlet of the concentrated water discharge device 10, the outlet of the cooling water pump 15 is connected to the inlet of the condensation layer 6, and the outlet of the condensation layer 6 is connected to the first inlet of the spray layer 4.

[0059] The outlet of the concentrated water discharge device 10 is connected to the inlet of the concentrated water user 11, the outlet of the circulating water pump 13 is connected to the inlet of the condenser 14, the outlet of the condenser 14 is connected to the second inlet of the spray layer 4, the outlet of the fresh water collection layer 5 is connected to the inlet of the secondary purification device 7, and the outlet of the secondary purification device 7 is connected to the inlet of the fresh water user 8.

[0060] The condensation layer 6 is composed of finned tubes with upward bends, and its shape is as follows Figure 2 As shown; the inlet of the condensation layer 6 is connected to the inlet of the finned tube, and the seawater with a lower temperature from the outlet of the cooling water pump 15 flows through the tube of the finned tube; the finned tubes are arranged in at least two layers, and the fins of the finned tubes in the same layer have a certain gap to ensure the passage of gas; the two layers of finned tubes are staggered, that is, the fin gap of the finned tube of the lower layer is opposite to the tube of the finned tube of the upper layer; the gas flow flowing upward from the fresh water collection layer 5 condenses to form condensed water after passing through the outside of the finned tube with a lower temperature; water flow holes are left at the root of the fin, and the condensed water accumulated on the upper part of the fin can fall downward into the fresh water collection layer 5; the outlet of the condensation layer 6 is connected to the outlet of the finned tube, and the seawater coming out of the outlet of the condensation layer 6 enters the first inlet of the spray layer 4.

[0061] The fresh water collecting layer 5 is composed of a number of hoods, the shape of which is as follows: Figure 3 As shown; the gas flow enters the hood from the bottom, turns and flows out of the hood, and some droplets fall into the fresh water collection layer 5 during the turning process; the droplets condensed from the condensation layer 6 fall on the upper part of the hood and flow into the fresh water collection layer 5; the condensed water and separated water collected in the fresh water collection layer 5 enter the secondary purification device 7 from the outlet of the fresh water collection layer 5.

[0062] Example 3

[0063] like Figure 1 As shown, this embodiment provides a method for desalinating seawater using circulating cooling water, comprising:

[0064] The seawater in the seawater tank 1 is pumped by the circulating water pump 13 to increase its pressure head and then enters the condenser 14 to exchange heat with the exhaust steam of the steam turbine, whereupon its temperature rises to form high-temperature seawater.

[0065] The high-temperature seawater passes through the condenser 14 and enters the spray layer 4, forming mist water;

[0066] As the mist water drips downward, it comes into contact with the upward flowing air, causing part of the water to evaporate and the seawater to be condensed to form concentrated seawater.

[0067] Water absorbs heat during the evaporation process, which will lower the temperature of the concentrated seawater and form low-temperature concentrated seawater;

[0068] Low-temperature concentrated seawater is collected in seawater pool 1;

[0069] The seawater in the seawater pool 1 enters the condensation layer 6 through the cooling water pump 15, which reduces the temperature of the condensation layer 6. The steam generated in the packing layer 3 and the spray layer 4 condenses into fresh water droplets after passing through the condensation layer 6 with a lower temperature. The fresh water droplets are collected in the fresh water collection layer 5.

[0070] The fresh water from the fresh water collection layer 5 flows into the secondary purification device 7 and is further processed according to the needs of the fresh water user 8 to form fresh water that meets the needs of the fresh water user 8;

[0071] The seawater discharged from the condensation layer 6 enters the spray layer 4 from the first inlet of the spray layer 4;

[0072] When the salt content of the seawater in the seawater tank 1 reaches a predetermined value, part of the concentrated seawater enters the concentrated water user 11 through the concentrated water discharge device 10, and the concentrated water user 11 further utilizes the seawater with a higher salt content;

[0073] The seawater in the seawater pool 1 is partially evaporated and partially discharged, and the water level is lowered. The seawater is replenished through the seawater replenishing device 9 to reach the normal water level.

[0074] Example 4

[0075] Thermal power plants that are directly cooled by seawater cause certain pollution to the surrounding marine environment. Newly built thermal power plants that need to use seawater cooling are required to adopt seawater circulation cooling.

[0076] A coastal city plans to build a 1000MW pressurized water reactor nuclear power plant to generate electricity and supply heat to a nearby chemical park.

[0077] The power station requires the use of seawater circulation cooling. The surrounding residents are worried that the large amount of steam discharged from the cooling tower will pollute the surrounding environment and are quite resistant to it.

[0078] The power station requires a large amount of fresh water to supply heat to the surrounding chemical park. Fresh water resources are relatively scarce, so desalination is needed to meet this demand. Calculations show that 100,000 tons of seawater must be desalinated every hour to produce 4,500 tons of fresh water. Desalination is expensive and requires a large site area, significantly increasing the project's capital costs. Desalination operations consume significant amounts of electricity, water treatment membranes, and labor, resulting in high operating costs.

[0079] By adopting the system and method proposed in the present invention, a condensation layer and a fresh water collection layer are added to the upper part of the cooling tower. Most of the steam in the airflow discharged to the air is condensed and recovered. There is almost no steam emerging from the upper part of the cooling tower, and there is almost no pollution to the surrounding area, which dispels the concerns of the surrounding people.

[0080] Condensate collected from both the condensation layer and the freshwater collection layer has a very low salt content, essentially meeting the water quality requirements for seawater desalination. Because the freshwater is collected at a higher level, it can flow by gravity to users located lower down. For users with higher water quality requirements, secondary purification can meet these requirements.

[0081] As steam condenses above the cooling tower, the air pressure there decreases, increasing the tower's suction force and significantly improving its efficiency. The temperature difference between the hot and cold seawater can reach over 12°C. This increased seawater temperature difference enhances the cooling effect of the condenser, reducing the circulating water pump's capacity to almost the same as the cooling water pump's.

[0082] This method can produce about 5,000 tons of fresh water per hour, which is enough to meet the heating needs. Therefore, the power plant no longer needs to consider building a seawater desalination system, saving a lot of investment.

[0083] After the fresh water in the seawater is extracted, the salt content of the concentrated seawater increases. The secondary utilization of the concentrated seawater reduces environmental pollution and increases additional income for the power plant.

[0084] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0085] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A system for desalinating seawater using circulating cooling water, characterized in that: The cooling tower (12) comprises a seawater pool (1), an air inlet layer (2), a filler layer (3), a spray layer (4), a freshwater collection layer (5), and a condensation layer (6) arranged in sequence from bottom to top in the cooling tower (12); The mist water sprayed from the spray layer (4) passes through the packing layer (3) and the air inlet layer (2) in sequence and converges into the seawater pool (1); The air entering from the air inlet layer (2) flows upward in the cooling tower (12) and passes through the packing layer (3) and the spray layer (4) in sequence; After the upward-flowing air contacts the downward-flowing water mist at the packing layer (3) and the spray layer (4), part of the water evaporates, and the water vapor forms a vapor flow with the upward-flowing air flow. The vapor flow continues to flow upward, passing through the fresh water collection layer (5) and the condensation layer (6). The steam in the vapor flow condenses at the condensation layer (6) to form water droplets, which converge downward at the fresh water collection layer (5). The condensation layer (6) is composed of finned tubes with upward bends; the inlet of the condensation layer (6) is connected to the inlet of the finned tube, and the seawater with a lower temperature from the outlet of the cooling water pump (15) flows through the tube of the finned tube; the finned tubes are arranged in at least two layers, and the fins of the finned tubes in the same layer have gaps for gas flow to pass through; the two layers of finned tubes are staggered, that is, the gaps between the fins of the lower layer of finned tubes are opposite to the tubes of the upper layer of finned tubes; the gas flow flowing upward from the fresh water collection layer (5) condenses after passing through the outside of the finned tubes with a lower temperature, forming condensed water; water flow holes are left at the root of the fins, and the condensed water gathered on the upper part of the fins falls downward into the fresh water collection layer (5); the outlet of the condensation layer (6) is connected to the outlet of the finned tube, and the seawater from the outlet of the condensation layer (6) enters the first inlet of the spray layer (4); The fresh water collection layer (5) is composed of a plurality of wind caps; the gas flow enters the wind caps from the bottom, turns and flows out of the wind caps, and part of the liquid droplets fall into the fresh water collection layer (5) during the turning process; The liquid droplets condensed from the condensation layer (6) fall on the upper part of the hood and flow into the fresh water collection layer (5); the condensed water and separated water collected by the fresh water collection layer (5) enter the secondary purification device (7) from the outlet of the fresh water collection layer (5).

2. The system for desalinating seawater using circulating cooling water according to claim 1, wherein: Space for installation and maintenance is left between the layers of the seawater pool (1), the air inlet layer (2), the filler layer (3), the spray layer (4), the fresh water collection layer (5) and the condensation layer (6).

3. The system for desalinating seawater using circulating cooling water according to claim 1, characterized in that: It also includes a seawater replenishment device (9) and a concentrated water discharge device (10) The outlet of the seawater replenishment device (9) is connected to the first inlet of the seawater pool (1), and the first outlet of the seawater pool (1) is connected to the inlet of the concentrated water discharge device (10).

4. The system for desalinating seawater using circulating cooling water according to claim 3, characterized in that: Also includes a circulating water pump (13) and a cooling water pump (15); The second outlet of the seawater pool (1) is connected to the inlet of the cooling water pump (15), the third outlet of the seawater pool (1) is connected to the inlet of the circulating water pump (13), the outlet of the cooling water pump (15) is connected to the inlet of the condensation layer (6), and the outlet of the condensation layer (6) is connected to the first inlet of the spray layer (4).

5. The system for desalinating seawater using circulating cooling water according to claim 4, characterized in that: It also includes concentrated water users (11), condensers (14), secondary purification devices (7) and fresh water users (8); The outlet of the concentrated water discharge device (10) is connected to the inlet of the concentrated water user (11), the outlet of the circulating water pump (13) is connected to the inlet of the condenser (14), the outlet of the condenser (14) is connected to the second inlet of the spray layer (4), the outlet of the fresh water collection layer (5) is connected to the inlet of the secondary purification device (7), and the outlet of the secondary purification device (7) is connected to the inlet of the fresh water user (8).

6. A method for desalinating seawater using circulating cooling water, characterized in that: The method is based on the system for desalinating seawater using circulating cooling water as described in claim 5, comprising: The seawater in the seawater tank (1) is pressurized by the circulating water pump (13) and then enters the condenser (14) to exchange heat with the exhaust steam of the steam turbine, whereby the temperature is increased to form high-temperature seawater; The high-temperature seawater passes through the condenser (14) and enters the spray layer (4), forming mist water; As the mist water drips downward, it comes into contact with the upward flowing air, causing part of the water to evaporate and the seawater to be condensed to form concentrated seawater. Water absorbs heat during the evaporation process, which will lower the temperature of the concentrated seawater and form low-temperature concentrated seawater; Low-temperature concentrated seawater is collected in a seawater tank (1); The seawater in the seawater pool (1) enters the condensation layer (6) through the cooling water pump (15), so that the temperature of the condensation layer (6) is reduced. The steam generated in the packing layer (3) and the spray layer (4) condenses into fresh water droplets after passing through the condensation layer (6) with a lower temperature. The fresh water droplets are collected in the fresh water collection layer (5); The fresh water from the fresh water collection layer (5) flows into the secondary purification device (7) and is further processed according to the needs of the fresh water user (8) to form fresh water that meets the needs of the fresh water user (8); The seawater discharged from the condensation layer (6) enters the spray layer (4) from the first inlet of the spray layer (4); When the salt content of the seawater in the seawater tank (1) reaches a predetermined value, part of the concentrated seawater enters the concentrated water user (11) through the concentrated water discharge device (10), and the concentrated water user (11) further utilizes the seawater with a higher salt content; The seawater in the seawater pool (1) is partially evaporated and partially discharged, and the water level is lowered. The seawater is replenished through the seawater replenishment device (9) to reach the normal water level.

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