Steam recovery device, circulation cooling system and circulation cooling method

Abstract

The present application relates to large industrial open cycle cooling water system, specifically to steam recovery device, circulating cooling system and circulating cooling method. Wherein the steam recovery device of the present application, including: at least one condenser pipe group, the condenser pipe group has condenser pipe, the surface of the condenser pipe is provided with fixedly connected heat exchange fin;Buffer cold water tank, the buffer cold water tank has water inlet pipe, the buffer cold water tank is communicated with the water inlet end of the condenser pipe by first pipeline;The first pipeline is communicated with first cooling water supply pump;The water inlet pipe has first valve, and the first pipeline has second valve;Raw water pool, the water outlet end of the condenser pipe is communicated with the raw water pool by second pipeline;Rotary centrifugal separation layer, the rotary centrifugal separation layer has at least two cyclones, each the cyclone has flow guide pipe respectively;The rotary centrifugal separation layer is vertically above the condenser pipe group.

Description

Technical Field

[0001] This invention relates to a large-scale industrial open-type circulating cooling water system, specifically a steam recovery device, a circulating cooling system, and a circulating cooling method. Background Technology

[0002] An open-loop circulating cooling water system is a highly efficient system that absorbs and releases heat through reciprocating circulation. It absorbs excess heat from heat exchange equipment (reactors, condensers, heat exchangers, etc.) through cooling water, releases the heat into the atmosphere through contact with air in a cooling tower, and then reuses the cooled circulating water in the next cycle. Due to its advantages such as good cooling effect, high heat exchange efficiency, and high water resource reuse rate, open-loop circulating cooling water systems are widely used in large-scale industrial cooling systems, particularly in heavy industries such as steel, thermal power, electric power, coking, and metallurgy.

[0003] Due to the open-loop system characteristics, the open-loop circulating cooling water absorbs heat and releases it in the circulating water tower. Along with this heat release, a large amount of water vapor is carried into the atmosphere, causing the circulating water to concentrate. During this concentration process, the mass concentration of calcium and magnesium ions continuously increases. When this concentration exceeds the solubility product of their sparingly soluble salts, scale will precipitate. Simultaneously, bicarbonates, primarily calcium and magnesium, lose equilibrium during the concentration heating process, transforming into carbonates and carbon dioxide. As the circulating water enters the cooling tower, the amount of carbon dioxide released into the air decreases, further contributing to the carbonate formation. Furthermore, the solubility of calcium carbonate, primarily calcium and magnesium, decreases significantly with increasing temperature. Therefore, as the concentration ratio increases, scale formation in the circulating water becomes faster and more abundant. Scale often adheres to the surfaces of heat exchangers and cooling tower packing, significantly impacting the safe operation of the circulating cooling system.

[0004] Currently, open-loop circulating cooling water systems control various indicators during the concentration process, such as increasing the concentration ratio of the circulating water by adding scale inhibitors and reducing the alkalinity of the water by adding concentrated sulfuric acid. This control method is costly, difficult to maintain and repair, and has low controllability. As the makeup water volume gradually increases, salts accumulate in the circulating water system. To control certain water quality indicators and prevent scaling, wastewater discharge is essential to achieve salt balance in the water. However, some local environmental policies require that circulating wastewater not be discharged externally and must be disposed of on-site, resulting in significant environmental upgrades and subsequent operation and maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that the wastewater of the existing open-type circulating cooling water system needs to be disposed of on-site, resulting in huge investment in environmental protection transformation and subsequent operation and maintenance costs; and that the need for water replenishment will also increase the scale problem.

[0006] To solve the above-mentioned technical problems, the present invention provides a steam recovery device, comprising:

[0007] At least one condenser tube assembly, the condenser tube assembly having condenser tubes, the surface of which is provided with fixedly connected heat exchange fins;

[0008] A buffer cold water tank has an inlet pipe, and the buffer cold water tank is connected to the inlet end of the condenser tube through a first pipe; the first pipe is connected to a first cooling water supply pump; the inlet pipe has a first valve, and the first pipe has a second valve;

[0009] The raw water tank is connected to the outlet of the condenser pipe via a second pipe.

[0010] A rotating centrifugal separation layer having at least two hydrocyclones, each of which has a guide tube; the rotating centrifugal separation layer is located vertically above the condenser tube assembly.

[0011] As a preferred embodiment of the steam recovery device of the present invention, it includes at least one fog-catching net, which is at an inclined angle;

[0012] Includes a water collection trough located vertically below the mist-catching net; the water collection trough has a water outlet;

[0013] The device includes an evaporator located vertically below the water collection tank; the evaporator has an overflow outlet on its side; and the evaporator has a drainage trough at an inclined angle above it, with a water inlet inside the drainage trough.

[0014] Includes an evaporator coil, which is connected to an expansion valve, a condenser, and a compressor; the evaporator coil is located inside the evaporator chamber;

[0015] The device includes a water distribution pipe, one end of which is at least partially above the condenser tube assembly but below the rotating centrifugal separation layer and is arranged parallel to the condenser tube assembly; the other end of the water distribution pipe is connected to the bottom of the evaporator; the water distribution pipe is equipped with a second cooling water supply pump; wherein the water distribution pipe above the condenser tube assembly has at least two nozzles.

[0016] In a preferred embodiment of the steam recovery device of the present invention, the inlet of the evaporator is equipped with a float valve.

[0017] The circulating cooling system of the present invention includes the steam recovery device described in any of the preceding claims, and also includes a circulating water tower. The condenser tube assembly, the rotating centrifugal separation layer, and the mist catching net in the steam recovery device are respectively located inside the circulating water tower, and the condenser tube assembly, the rotating centrifugal separation layer, and the mist catching net respectively seal the cross-sections of the circulating water tower at different heights.

[0018] As a preferred embodiment of the circulating cooling system of the present invention, it includes a tower, which is fixedly connected to the circulating water tower; at least the buffer cold water tank, condenser, first cooling water supply pump and second cooling water supply pump of the steam recovery device are respectively installed on the tower.

[0019] The circulating cooling method of the present invention, employing the steam recovery device or the circulating cooling system described in any one of the preceding claims, further includes:

[0020] Steam is obtained from inside the circulating water tower, and the steam is condensed into water and collected using a mist eliminator.

[0021] The water is cooled to a low temperature by exchanging heat with the collected water using an evaporator coil.

[0022] The low-temperature water is sprayed from top to bottom inside the circulating water tower through a nozzle, so that the sprayed water comes into contact with the steam inside the circulating water tower. The water condensed inside the circulating water tower exchanges heat with the steam inside the circulating water tower, thereby lowering the temperature of the steam inside the circulating water tower, allowing more steam to condense into water quickly, and reducing the speed and amount of steam discharged upwards, thus improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost outwards.

[0023] As a preferred embodiment of the circulating cooling method of the present invention, the remaining steam in the circulating water tower is heat-exchanged using a condenser tube assembly; and the water heated by the heat exchange in the condenser tubes is supplied to the raw water tank to raise the operating water temperature of the raw water treatment system.

[0024] The remaining steam in the circulating water tower after heat exchange with the condenser tube group is further treated by the hydrocyclone in the rotating centrifugal separation layer. The water vapor generates centrifugal force as it passes through the hydrocyclone, and the water droplets in the rotating water vapor are dispersed on the wall of the guide tube, and then gradually flow down to the surface of the condenser tube group, the surface of the mist catching net and the inside of the circulating water tower.

[0025] In a preferred embodiment of the circulating cooling method of the present invention, the low-temperature water is sprayed from top to bottom and at least partially sprayed onto the surface of the condenser tube assembly and the mist eliminator, further exchanging heat with the steam in the circulating water tower and improving the heat exchange efficiency of the condenser tube assembly and the mist eliminator.

[0026] Beneficial effects

[0027] This invention solves the above-mentioned existing problems and other existing problems not mentioned above, and correspondingly brings at least the following innovative advantages:

[0028] The steam recovery device, circulating cooling system, and circulating cooling method of this invention, from the perspective of controlling the concentration process of circulating cooling water and reducing water vapor evaporation, recover steam, cool and condense the water vapor evaporated in the circulating water tower, separate the water vapor from the water vapor, and collect the water carried away by evaporation during the concentration process of the circulating water system. Reducing the evaporation rate can reduce the amount of external water replenishment, reduce the entry of external salts, reduce the concentration of salts in the water, reduce the amount of circulating water discharged, and thus reduce the amount of subsequent treatment work.

[0029] The steam recovery device, circulating cooling system, and circulating cooling method of this invention utilize the condensed water inside the circulating water tower to exchange heat with the steam inside the circulating water tower; and utilize the evaporation coil to exchange heat with the collected water, reducing the water to a low temperature before spraying it into the circulating water tower, which greatly improves efficiency, lowers the steam temperature inside the circulating water tower, allows more steam to condense into water quickly, and reduces the speed and amount of steam discharged upwards, thereby improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost outwards.

[0030] The steam recovery device, circulating cooling system, and circulating cooling method of the present invention spray the low-temperature water from top to bottom, and at least partially spray it onto the surface of the condenser tube assembly and the mist eliminator, so as to further exchange heat with the steam in the circulating water tower and improve the heat exchange efficiency of the condenser tube assembly and the mist eliminator.

[0031] The steam recovery device, circulating cooling system, and circulating cooling method of this invention, from the perspective of energy saving, reuse the warm water discharged from the second pipe. This part of the heat is the latent heat released by the steam-water conversion, which has huge energy. Recovering this part of the heat has good economic benefits. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0034] Figure 3 for Figure 1 A magnified view of a portion of region B in the middle;

[0035] Figure 4 for Figure 1 A magnified view of a portion of region C in the middle;

[0036] Figure 5 This is a diagram illustrating the effect of the fog-catching net of the present invention collecting water droplets.

[0037] In the diagram: 1. Condenser coil assembly, 2. Condenser coil, 3. Heat exchange fins, 4. Buffer cold water tank, 5. Inlet pipe, 6. First pipeline, 7. First cooling water supply pump, 8. First valve, 9. Second valve, 10. Raw water tank, 11. Second pipeline, 12. Rotary centrifugal separator, 13. Hydrocyclone, 14. Guide pipe, 15. Mist eliminator, 16. Water collection tank, 17. Outlet, 18. Evaporator, 19. Overflow port, 20. Drainage trough, 21. Inlet, 22. Evaporator coil, 23. Condenser, 24. Water distribution pipe, 25. Second cooling water supply pump, 26. Nozzle, 27. Float valve, 28. Circulating water tower, 29. Tower. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the accompanying drawings, the same reference numerals represent the same parts. It should be noted that the described embodiments are only some, not all, of the embodiments disclosed herein.

[0040] Based on the embodiments described in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0041] The steam recovery device of the present invention includes at least one condenser tube assembly 1. Figure 1 and Figure 4 This demonstrates that the condenser assembly 1 has a condenser 2, such as... Figure 4 As shown, the surface of the condenser tube 2 is provided with heat exchange fins 3 that are fixedly connected.

[0042] Buffer cold water tank 4, see Figure 1 and Figure 3 The buffer cold water tank 4 has a water inlet pipe 5, and the buffer cold water tank 4 is connected to the water inlet end of the condenser pipe 2 through a first pipe 6; Figure 3 The first pipe 6 is connected to a first cooling water supply pump 7; the inlet pipe 5 has a first valve 8, and the first pipe 6 has a second valve 9;

[0043] Raw pool 10, Figure 1 The water outlet of the condenser 2 is shown to be connected to the raw water tank 10 via the second pipe 11;

[0044] Rotary centrifugal separation layer 12, Figure 1 and Figure 4The rotating centrifugal separation layer 12 is shown to have at least two hydrocyclones 13, each of which has a guide tube 14; the rotating centrifugal separation layer 12 is located vertically above the condenser tube assembly 1. The hydrocyclones 13 are cylindrical, with built-in propeller-type blades, and are made of a new silicon carbide ceramic material, which has corrosion-resistant properties.

[0045] like Figure 1 As shown, it includes at least one fog-catching net 15, which is at an inclined angle; that is, one side is higher than the other.

[0046] Including water collection tank 16, Figure 1 and Figure 2 The water collection tank 16 is shown to be located vertically below the mist-catching net 15; the water collection tank 16 has a water outlet 17;

[0047] Including evaporator 18, Figure 1 and Figure 2 The evaporator 18 is shown to be vertically below the water collection tank 16; the side of the evaporator 18 has an overflow port 19; Figure 2 The evaporator 18 is shown to have a drainage trough 20 at an inclined angle above it, and the drainage trough 20 has a water inlet 21 inside it;

[0048] It includes an evaporator coil 22, which is connected to an expansion valve, a condenser 23, and a compressor installed in the condenser 23; Figure 2 This demonstrates that the evaporator coil 22 is located inside the evaporator chamber 18;

[0049] Including water distribution pipe 24, see Figure 1 and Figure 2 One end of the water distribution pipe 24 is at least partially above the condenser tube assembly 1 but below the rotating centrifugal separation layer 12, and this section of the water distribution pipe 24 above the condenser tube assembly 1 is arranged parallel to the condenser tube assembly 1; for example Figure 1 and Figure 2 As shown, the other end of the water distribution pipe 24 is connected to the bottom of the evaporator 18; the water distribution pipe 24 is equipped with a second cooling water supply pump 25; Figure 4 The water distribution pipe 24, which is located above the condenser tube assembly 1, is shown to have at least two nozzles 26.

[0050] like Figure 2As shown, the inlet 21 of the evaporator 18 is equipped with a float valve 27. This embodiment has two usage scenarios. When the float valve 27 is not installed, all water in the water collection tank 16 flows into the evaporator 18. When the evaporator 18 is full, water flows outward from the overflow port 19 and / or the drain trough 20, ensuring that the outward-flowing water has a lower temperature. When the float valve 27 is installed, the float valve 27 pushes the inlet 21 to open or close, thus better ensuring that the water in the evaporator 18 has a lower temperature.

[0051] This embodiment 2 circulating cooling system includes all the solutions of embodiment 1, therefore the similarities will not be repeated, only the differences will be described. The difference is that, see [link to embodiment 1]. Figure 1 It also includes a circulating water tower 28. The condenser tube group 1, the rotating centrifugal separation layer 12 and the mist catching net 15 in the steam recovery device are respectively located at three different positions: high, medium and low in the circulating water tower 28, and the condenser tube group 1, the rotating centrifugal separation layer 12 and the mist catching net 15 respectively seal the cross sections of the circulating water tower 28 at different heights.

[0052] See Figure 1 The device includes a tower 29, which is fixedly connected to the circulating water tower 28; at least the buffer cold water tank 4, condenser 23, first cooling water supply pump 7 and second cooling water supply pump 25 of the steam recovery device are respectively installed on the tower 29.

[0053] The circulating cooling method in this embodiment 3 will employ the steam recovery device described in embodiment 1 or the circulating cooling system described in embodiment 2, and further includes:

[0054] Steam is obtained from inside the circulating water tower 28, and the steam is condensed into water and collected using the mist trap 15;

[0055] The water is cooled to a low temperature by heat exchange between the evaporator coil 22 and the collected water.

[0056] The low-temperature water is sprayed from top to bottom through the nozzle 26 inside the circulating water tower 28, so that the sprayed water comes into contact with the steam inside the circulating water tower 28. The water condensed inside the circulating water tower 28 exchanges heat with the steam inside the circulating water tower 28, thereby lowering the temperature of the steam inside the circulating water tower 28, allowing more steam to condense into water quickly, and reducing the speed and amount of steam discharged upwards, thus improving the cooling efficiency of the circulating water tower 28 and reducing the amount of steam lost outwards.

[0057] Furthermore, the remaining steam in the circulating water tower 28 is heat-exchanged using the condenser tube assembly 1; and the water heated by the heat exchange in the condenser tube 2 is supplied to the raw water tank 10 to raise the operating water temperature of the raw water treatment system.

[0058] The remaining steam in the circulating water tower 28 after heat exchange with the condenser tube group 1 is treated again by the hydrocyclone 13 of the rotating centrifugal separation layer 12. The water vapor generates centrifugal force as it passes through the hydrocyclone 13. The water droplets in the rotating water vapor are dispersed on the wall of the guide pipe 14, and then gradually flow down to the surface of the condenser tube group 1, the surface of the mist catching net 15, and the inside of the circulating water tower 28.

[0059] Furthermore, the low-temperature water is sprayed from top to bottom and at least partially sprayed onto the surfaces of the condenser tube assembly 1 and the mist eliminator 15, further exchanging heat with the steam in the circulating water tower 28 and improving the heat exchange efficiency of the condenser tube assembly 1 and the mist eliminator 15.

[0060] Currently, the circulating water tower 28 releases heat into the atmosphere. During this heat release process, a large number of water molecules are carried, forming water vapor, which enters the atmosphere through the top of the circulating water tower 28. The original solution, due to the use of external water, increases scale buildup. Therefore, the steam recovery device, circulating cooling system, and circulating cooling method of Embodiments 1 to 3 of this invention involve collecting internal steam for use, without using an external water source, thus avoiding the formation of new scale. First, the mist-collecting net 15 collects most of the water, which flows into the evaporator 18. Figure 5 The diagram shows the effect of the mist trap 15 collecting water droplets; the water exchanging heat with the evaporator coil 22 in the evaporator 18 can reach a lower water temperature. Opening the first valve 8, the second valve 9, and the first cooling water supply pump 7 delivers direct-flow cooling water to the condenser coil 1. The remaining steam collected by the mist trap 15 undergoes a secondary heat exchange with the condenser coil 1. The direct-flow cooling water in the condenser coil 2 lowers the surface temperature of the heat exchange fins 3, further reducing the temperature of the rising water vapor. Most of the moisture in the water vapor condenses on the surfaces of the heat exchange fins 3 and the condenser coil 2, forming water droplets, but the condensation process is not completely finished. As the water vapor condenses in the coil 1, the water particles gradually increase in size. Continuing through the rotating centrifugal separation layer 12, the water vapor flow generates a certain rotational force due to the action of the hydrocyclone 13 and the guide pipe 14. Small water particles collide with each other due to the rotational force, gradually increasing in size to form large water particles. Furthermore, the water in the evaporator 18 undergoes heat exchange through the evaporator coil 22 to form even lower temperature water. This low temperature water is sprayed out through the nozzle 26, which on the one hand lowers the temperature in the entire circulating water tower 28, and on the other hand further increases the amount of water collected from the steam by the mist catching net 15, the condenser coil 1, and the rotating centrifugal separation layer 12, thus greatly increasing the amount of water collected from the steam.

[0061] The water discharged from the second pipe 11 is warm water. The pump pool 10 can be a high-density sedimentation tank or a flocculation sedimentation tank. The warm water discharged into the raw water pool 10 can be used as the inlet water of the raw water pretreatment system, which is beneficial to raising the operating water temperature of the raw water treatment system. Especially in winter, when the raw water temperature is low, it helps to improve the operating effect of the sedimentation tank.

[0062] The steam recovery device, circulating cooling system, and circulating cooling method of this invention, from the perspective of controlling the circulating cooling water concentration process and reducing water vapor evaporation, recover steam, cool and condense the water vapor evaporated in the circulating water tower 28, separate the water vapor from the water vapor, and collect the water carried away by evaporation during the concentration process of the circulating water system. Reducing the evaporation amount can reduce the amount of external water replenishment, reduce the entry of external salts, reduce the concentration of salts in the water, reduce the amount of circulating water discharged, and thus reduce the amount of subsequent treatment work.

[0063] The steam recovery device, circulating cooling system, and circulating cooling method of the present invention utilize the condensed water inside the circulating water tower 28 to exchange heat with the steam inside the circulating water tower 28; and utilize the evaporation coil 22 to exchange heat with the collected water, reducing the water to a low temperature before spraying it into the circulating water tower 28, which greatly improves efficiency, lowers the steam temperature inside the circulating water tower 28, allows more steam to condense into water quickly, and reduces the speed and amount of steam discharged upwards, thereby improving the cooling efficiency of the circulating water tower 28 and reducing the amount of steam lost outwards.

[0064] The steam recovery device, circulating cooling system, and circulating cooling method of the present invention spray the low-temperature water from top to bottom and at least partially spray it onto the surface of the condenser tube assembly 1 and the mist catching net 15, so as to further exchange heat with the steam in the circulating water tower 28 and improve the heat exchange efficiency of the condenser tube assembly 1 and the mist catching net 15.

[0065] From an energy-saving perspective, the steam recovery device, circulating cooling system, and circulating cooling method of this invention reuse the warm water discharged from the second pipe 11. This heat is the latent heat released by the steam-water conversion, which has great energy. Recovering this heat has good economic benefits.

[0066] The terms "first," "second," and similar words used in the specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" mean that the elements or objects preceding "comprising" cover the elements or objects listed after "comprising" or "including" and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are only used to indicate relative positional relationships, and these relative positional relationships may also change accordingly when the absolute position of the described object changes.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of protection of the present invention is defined by the appended claims. For those skilled in the art, other embodiments can be obtained based on the accompanying drawings without creative effort, and any modifications based on the claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A steam recovery device, characterized in that, include: At least one condenser tube assembly, the condenser tube assembly having condenser tubes, the surface of which is provided with fixedly connected heat exchange fins; A buffer cold water tank has an inlet pipe, and the buffer cold water tank is connected to the inlet end of the condenser tube through a first pipe; the first pipe is connected to a first cooling water supply pump; the inlet pipe has a first valve, and the first pipe has a second valve; The raw water tank is connected to the outlet of the condenser pipe via a second pipe. A rotating centrifugal separation layer having at least two hydrocyclones, each of which has a guide tube; the rotating centrifugal separation layer is located vertically above the condenser tube assembly; Includes at least one fog-catching net, which is at an inclined angle; Includes a water collection trough located vertically below the mist-catching net; the water collection trough has a water outlet; The device includes an evaporator located vertically below the water collection tank; the evaporator has an overflow outlet on its side; and the evaporator has a drainage trough at an inclined angle above it, with a water inlet inside the drainage trough. Includes an evaporator coil, which is connected to an expansion valve, a condenser, and a compressor; the evaporator coil is located inside the evaporator chamber; The device includes a water distribution pipe, one end of which is at least partially above the condenser tube assembly but below the rotating centrifugal separation layer and is arranged parallel to the condenser tube assembly; the other end of the water distribution pipe is connected to the bottom of the evaporator; the water distribution pipe is equipped with a second cooling water supply pump; wherein the water distribution pipe above the condenser tube assembly has at least two nozzles.

2. The steam recovery device according to claim 1, characterized in that, The evaporator has a float valve at its water inlet.

3. A circulating cooling system, characterized in that, The steam recovery device according to any one of claims 1 to 2 further includes a circulating water tower, wherein the condenser tube assembly, the rotating centrifugal separation layer and the mist catching net in the steam recovery device are respectively located inside the circulating water tower, and the condenser tube assembly, the rotating centrifugal separation layer and the mist catching net respectively seal the cross sections of the circulating water tower at different heights.

4. The circulating cooling system according to claim 3, characterized in that, The device includes a tower frame, which is fixedly connected to the circulating water tower; at least the buffer cold water tank, condenser, first cooling water supply pump and second cooling water supply pump of the steam recovery device are respectively installed on the tower frame.

5. A circulating cooling method, characterized in that, The steam recovery device according to any one of claims 1 to 2 or the circulating cooling system according to any one of claims 3 to 4 further includes: Steam is obtained from inside the circulating water tower, and the steam is condensed into water and collected using a mist eliminator. The water is cooled to a low temperature by exchanging heat with the collected water using an evaporator coil. The low-temperature water is sprayed from top to bottom inside the circulating water tower through a nozzle, so that the sprayed water comes into contact with the steam inside the circulating water tower. The water condensed inside the circulating water tower exchanges heat with the steam inside the circulating water tower, thereby lowering the temperature of the steam inside the circulating water tower, allowing more steam to condense into water quickly, and reducing the speed and amount of steam discharged upwards, thus improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost outwards.

6. The circulating cooling method according to claim 5, characterized in that, The remaining steam in the circulating water tower is heat-exchanged using the condenser tube assembly; and the water heated by the heat exchange in the condenser tubes is supplied to the raw water tank to raise the operating water temperature of the raw water treatment system. The remaining steam in the circulating water tower after heat exchange with the condenser tube group is further treated by the hydrocyclone in the rotating centrifugal separation layer. The water vapor generates centrifugal force as it passes through the hydrocyclone, and the water droplets in the rotating water vapor are dispersed on the wall of the guide tube, and then gradually flow down to the surface of the condenser tube group, the surface of the mist catching net and the inside of the circulating water tower.

7. The circulating cooling method according to claim 6, characterized in that, The low-temperature water is sprayed from top to bottom and at least partially onto the surface of the condenser tube assembly and the mist eliminator, further exchanging heat with the steam in the circulating water tower and improving the heat exchange efficiency of the condenser tube assembly and the mist eliminator.

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