System and method for seawater desalination by using circulating cooling water

Abstract

The invention discloses a system and a method for seawater desalination by using circulating cooling water. The system comprises a cooling tower, and a seawater pool, an air inlet layer, a filler layer, a spraying layer, a fresh water collection layer and a condensation layer which are sequentially arranged in the cooling tower from bottom to top, according to the method, mist water sprayed from a spraying layer sequentially penetrates through a filler layer and an air inlet layer to be converged into a seawater pool, and air entering from the air inlet layer flows upwards in a cooling tower and sequentially penetrates through the filler layer and the spraying layer; after air flowing upwards and water mist flowing downwards are in contact with each other in the filler layer and the spraying layer, part of water is evaporated, steam and air flow flowing upwards form gas-steam flow, the gas-steam flow continues to flow upwards and penetrates through the fresh water collecting layer and the condensation layer, and steam in the gas-steam flow is condensed in the condensation layer to form water drops which are gathered downwards in the fresh water collecting layer. According to the invention, seawater desalination is realized by using circulating cooling water.

Description

Technical Field

[0001] The 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 work in the turbine needs to be cooled and condensed into water in the condenser by 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 the seawater absorbs the heat of the turbine exhaust steam in the condenser, the temperature rises to form high-temperature seawater. The high-temperature seawater enters the spray layer at the top of the cooling tower, forms mist droplets in the spray layer, and contacts the airflow rising from the bottom of the cooling tower. Part of the water in the droplets is evaporated. Due to the heat absorption of evaporation, the temperature of the droplets decreases, and finally the high-temperature seawater from the condenser is cooled to form low-temperature seawater. At present, the temperature difference between high-temperature seawater and low-temperature seawater is about 10°C. The water evaporated from the droplets forms steam, and the steam forms a gas flow with the air rising from the bottom, which is discharged from the top of the cooling tower to the atmosphere. A 1000MW thermal power generating unit adopts sea circulation cooling technology, and the amount of steam discharged from the cooling tower is about 5000t / h. These steam will eventually be scattered in the surrounding environment, causing certain pollution to the surrounding environment.

[0005] At the same time, in addition to cold source water, thermal power plants also require a large amount of fresh 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 solution:

[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 fresh water 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 at 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 at the condensation layer to form water droplets, which converge downward at the fresh water collection layer.

[0012] A further improvement of the present invention is that spaces for installation and maintenance are reserved between the seawater pool, the air intake 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 replenishment 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 discharge 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 also includes 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 inlet of the concentrated water user, 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 inlet of the fin tube, and the seawater with a lower temperature from the outlet of the cooling water pump flows through the tube of the fin tube; the fin tubes are arranged in at least two layers, and the fins of the fin tubes in the same layer have gaps for gas flow to pass through; the two layers of fin tubes are staggered, that is, the gaps between the fins of the lower layer of fin tubes are directly opposite to the tubes of the upper layer of fin tubes; the gas flow flowing upward from the fresh water collection layer condenses to form condensed water after passing through the outside of the fin tube with a lower temperature; water flow holes are left at the roots of the wings, 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 outlet of the fin 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, flows out of the wind hood after turning, and some droplets fall into the fresh water collection layer during the turning process; 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, after the pressure head is raised by the circulating water pump, enters the condenser and exchanges heat with the exhaust steam of the steam turbine, and the temperature rises to form high-temperature seawater;

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

[0026] When 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 concentrated to form concentrated seawater.

[0027] Water absorbs heat during evaporation, which will lower the temperature of concentrated seawater, forming 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 gather 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 the fresh water users to form fresh water that meets the needs of the 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 enters the concentrated water user through the concentrated water discharge device, and the concentrated water user further utilizes 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 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 collecting layer on the upper part of a circulating cooling tower, most of the steam discharged to the atmosphere can be condensed and collected, thereby saving water resources and reducing pollution to the surrounding environment. For the seawater circulating cooling technology, the steam formed by evaporation of seawater in the circulating tower has a low salt content, and the water generated by the condensation of the steam is fresh water. The fresh water is collected in the fresh water collecting layer to achieve the desalination of seawater. By adding a condensation layer, most of the steam is condensed, the air pressure on the upper part of the cooling tower is reduced, the air flow rate rising from the bottom of the cooling tower can be accelerated, the cooling effect of the cooling tower can be enhanced, and a lower seawater temperature can be obtained, so the capacity of the circulating water pump can be reduced, and the investment and operation costs can be reduced.

[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 cost and operation cost.

[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 relatively high, 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 The present invention is a structural block diagram of a system for desalinating seawater using circulating cooling water.

[0040] Figure 2 It is a schematic structural diagram of the condensation layer of the present invention.

[0041] Figure 3 It is a schematic structural diagram 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. Spraying 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] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[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 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, and do not indicate or imply that the referred device or element 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] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates 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 specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

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

[0051] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[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, a system for desalinating seawater using circulating cooling water provided in this embodiment comprises a cooling tower 12, and a seawater pool 1, an air inlet layer 2, a packing layer 3, a spray layer 4, a fresh water collecting layer 5 and a condensing layer 6 which are sequentially arranged in the cooling tower 12 from bottom to top; 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 sequentially; 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 gas-vapor flow with the upward-flowing airflow, and the gas-vapor flow continues to flow upward, passing through the fresh water collecting layer 5 and the condensing layer 6, and the steam in the gas-vapor flow condenses at the condensing layer 6 to form water droplets, which converge downward at the fresh water collecting layer 5.

[0055] Example 2

[0056] like Figure 1 As shown, the present embodiment provides a system for desalinating seawater using circulating cooling water, comprising 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, the air inlet layer 2, the packing layer 3, the spray layer 4, the fresh water collection layer 5, and the condensation layer 6 are sequentially arranged in the cooling tower 12 from bottom to top, and a certain space for installation and maintenance is reserved between each layer; 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, and sequentially passes through the packing layer 3 and the spray layer 4; 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 gas-vapor flow with the upward-flowing airflow, and the gas-vapor flow continues to flow upward, passes through the fresh water collection layer 5 and the condensation layer 6, and the steam in the gas-vapor flow condenses at the condensation layer 6 to form water droplets, which converge downward at 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 fin tube, and the seawater with lower temperature from the outlet of the cooling water pump 15 flows through the tube of the fin tube; the fin tubes are arranged in at least two layers, and the fins of the fin tubes in the same layer have a certain gap to ensure the passage of gas; the two layers of fin tubes are staggered, that is, the fin gap of the lower fin tube is opposite to the tube of the upper fin tube; the gas flow flowing upward from the fresh water collection layer 5 condenses to form condensed water after passing through the outside of the fin tube with lower temperature; water flow holes are left at the root of the fin, and the condensed water gathered 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 fin 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 collection layer 5 is composed of a plurality of hoods, the shape of which is as follows: Figure 3 As shown; the gas flow enters the wind hood from the bottom, turns and flows out of the wind 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 wind 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.

[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 pool 1 is raised in pressure by the circulating water pump 13 and then enters the condenser 14 to exchange heat with the exhaust steam of the steam turbine, and the temperature is increased to form high-temperature seawater;

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

[0066] When 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 concentrated to form concentrated seawater.

[0067] Water absorbs heat during evaporation, which will lower the temperature of concentrated seawater, forming 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, so that the temperature of the condensation layer 6 is reduced, and 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, and 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 pool 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 replenishment 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. All newly built thermal power plants that need to be cooled by seawater 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 the nearby chemical park.

[0077] The power station requires the use of seawater circulation cooling, but 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 needs a lot of fresh water to supply heat to the surrounding chemical park. The surrounding fresh water resources are relatively scarce, and the fresh water supply needs to be met by desalination of seawater. The final calculation is that 100,000 tons of seawater needs to be desalinated every hour to obtain 4,500 tons of fresh water. The investment in seawater desalination is high, and it occupies a large area of ​​the site, which greatly increases the capital construction cost of the project. The operation of seawater desalination consumes a lot of electricity, water treatment membranes and labor, and the operating cost is also very high.

[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, and most of the steam in the airflow discharged to the air is condensed and recovered. The steam is almost invisible in 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] The condensed water collected by the condensation layer and the fresh water collection layer has a very low salt content, which basically meets the water quality requirements of seawater desalination. Since the collected fresh water is at a higher position, it can reach users at a lower position by gravity. For users with higher requirements for water quality, the requirements can be met through secondary purification.

[0081] As the steam condenses at the top of the cooling tower, the air pressure at the top of the cooling tower decreases, increasing the suction force of the cooling tower, greatly improving the efficiency of the cooling tower, and the temperature difference between hot seawater and cold seawater can reach more than 12°C. As the temperature difference of seawater increases, the cooling effect of the condenser is increased, and the capacity of the circulating water pump is reduced, and its reduced capacity is almost the same as the capacity of the cooling water pump.

[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 profits 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0085] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A system for desalinating seawater using circulating cooling water, It is 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 fresh water collection layer (5) and a condensation layer (6) which are sequentially arranged in the cooling tower (12) from bottom to top; 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 upwardly flowing air contacts the downwardly flowing water mist at the packing layer (3) and the spray layer (4), part of the water evaporates, and the water vapor forms a gas-vapor flow with the upwardly flowing air flow. The gas-vapor flow continues to flow upward, passes through the fresh water collection layer (5) and the condensation layer (6), and the steam in the gas-vapor flow condenses at the condensation layer (6) to form water droplets, which converge downward at the fresh water collection layer (5).

2. A system for desalinating seawater using circulating cooling water according to claim 1, It is characterized in that Space for installation and maintenance is reserved between the seawater pool (1), the air intake layer (2), the filler layer (3), the spray layer (4), the fresh water collection layer (5) and the condensation layer (6).

3. A system for desalinating seawater using circulating cooling water according to claim 1, It is 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. A system for desalinating seawater using circulating cooling water according to claim 3, It is characterized in that It 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. A system for desalinating seawater using circulating cooling water according to claim 4, It is characterized in that It also includes a concentrated water user (11), a condenser (14), a secondary purification device (7) and a fresh water user (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 system for desalinating seawater using circulating cooling water according to claim 5, It is characterized in that The condensation layer (6) consists of finned tubes with upward bends.

7. A system for desalinating seawater using circulating cooling water according to claim 6, It is characterized in that 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 directly 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 tube with a lower temperature to form condensed water; water flow holes are left at the root of the fins, and the condensed water gathered on the upper part of the fin 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 coming out of the outlet of the condensation layer (6) enters the first inlet of the spray layer (4).

8. A system for desalinating seawater using circulating cooling water according to claim 5, It is characterized in that The fresh water collection layer (5) is composed of a number of hoods.

9. A system for desalinating seawater using circulating cooling water according to claim 8, It is characterized in that The gas flow enters the hood from the bottom, turns and flows out of the hood, and part of the liquid droplets fall into the fresh water collection layer (5) during the turning process; Liquid droplets condensed from the condensation layer (6) fall onto the upper part of the hood and flow into the fresh water collection layer (5); 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).

10. A method for desalinating seawater using circulating cooling water, It is characterized in that The method is based on a system for desalinating seawater using circulating cooling water as described in claim 5, comprising: The seawater in the seawater pool (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, whereupon the temperature of the seawater increases to form high-temperature seawater; The high-temperature seawater passes through the condenser (14) and enters the spray layer (4) to form mist water; When 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 concentrated to form concentrated seawater. Water absorbs heat during evaporation, which will lower the temperature of concentrated seawater, forming low-temperature concentrated seawater; The 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, and 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, and 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 pool (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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