Steam recovery device, circulating cooling system and circulating cooling method

Abstract

The invention relates to a large industrial open type circulating cooling water system, in particular to a steam recovery device, a circulating cooling system and a circulating cooling method. The steam recovery device comprises at least one condensation pipe set, the condensation pipe set is provided with condensation pipes, and fixedly-connected heat exchange fins are arranged on the surfaces of the condensation pipes; the buffer cold water tank is provided with a water inlet pipe, and the buffer cold water tank is communicated with the water inlet end of the condensation pipe through a first pipeline; the first pipeline is communicated with a first cooling water supply pump; the water inlet pipe is provided with a first valve, and the first pipeline is provided with a second valve; the water outlet end of the condensation pipe is communicated with the raw water tank through a second pipeline; the rotary centrifugal separation layer is provided with at least two hydrocyclones, and each hydrocyclone is provided with a flow guide pipe; and the rotary centrifugal separation layer is positioned vertically above the condensation pipe group.

Description

Technical Field

[0001] The invention relates to a large-scale industrial open circulating cooling water system, in particular to a steam recovery device, a circulating cooling system and a circulating cooling method. Background Art

[0002] The open circulating cooling water system is a highly efficient system that absorbs and releases heat in a reciprocating cycle. The cooling water absorbs the excess heat of the heat exchange equipment (reactor, condenser, heat exchanger, etc.), and releases the heat into the atmosphere through the contact with the air in the cooling tower. The cooled circulating water is reused to continue to enter the next cycle. The open circulating cooling water system is widely used in large industrial cooling systems due to its advantages such as good cooling effect, high heat exchange efficiency, and high water resource reuse rate. It is widely used in heavy industries such as steel, thermal power, electricity, coking, and metallurgy.

[0003] Due to the characteristics of the open system, the open circulating cooling water absorbs heat and releases it in the circulating water tower. Along with the release of heat, the heat will take away a large amount of water vapor into the atmosphere, causing the concentration of the circulating water body. During the concentration process, the mass concentration of calcium and magnesium ions will continue to increase. When it exceeds the solubility product of its insoluble salts, scaling will precipitate. At the same time, bicarbonate mainly composed of calcium and magnesium loses balance and is converted into carbonate and carbon dioxide during the concentration and heating process. After the circulating water enters the cooling tower, the amount of carbon dioxide entering the air continues to decrease, and the equilibrium reaction further produces carbonate. Furthermore, the solubility of calcium carbonate mainly composed of calcium and magnesium decreases significantly with the increase in temperature. Therefore, as the concentration rate of circulating water increases, the scale in the water body is generated faster and more. The scale is often attached to the surface of the heat exchanger and the surface of the heat exchange filler of the cooling tower, which has a great impact on the safe operation of the circulating cooling system.

[0004] At present, open circulating cooling water systems are all controlled by various indicators in the concentration process, such as adding scale inhibitors to increase the concentration rate of circulating water, adding concentrated sulfuric acid to reduce the alkalinity in the water body, etc. for post-control. This control method has high investment costs, is difficult to maintain and repair, and has low control and manipulability. As the amount of water replenishment gradually increases, the salts in the circulating water system gradually accumulate. In order to control certain water quality indicators and ensure that the water body does not scale, water body sewage discharge is essential, and the discharge of wastewater can achieve salt balance in the water body. Some local environmental protection policies require that circulating sewage is not allowed to be discharged and must be consumed within the factory, which will cause huge investment in environmental protection transformation and subsequent operation and maintenance costs. Summary of the invention

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

[0006] In order to solve the above technical problems, the steam recovery device of the present invention comprises: At least one condenser tube group, the condenser tube group having condenser tubes, the surface of the condenser tubes being provided with fixedly connected heat exchange fins; A buffer cold water tank, the buffer cold water tank having a water inlet pipe, the buffer cold water tank is connected to the water inlet end of the condenser pipe through a first pipe; the first pipe is connected to a first cooling water supply pump; the water inlet pipe has a first valve, and the first pipe has a second valve; A raw water pool, wherein the water outlet end of the condenser pipe is connected to the raw water pool through a second pipe; The rotating centrifugal separation layer has at least two cyclones, each of which has a flow guide tube; the rotating centrifugal separation layer is located vertically above the condensing tube group.

[0007] As a preferred embodiment of the steam recovery device of the present invention, it comprises at least one mist catching net, which is at an inclined angle; It comprises a water collecting tank, which is located vertically below the mist catching net; the water collecting tank has a water outlet; The evaporator comprises an evaporator box, which is located vertically below the water collecting tank; the side of the evaporator box has an overflow port; the top of the evaporator box has a drainage groove at an inclined angle, and the drainage groove has a water inlet; It includes an evaporating coil connected to an expansion valve, a condenser and a compressor; the evaporating coil is located in the evaporating box; It includes a water distribution pipe, one end of which is at least partially located above the condensing tube group but below the rotating centrifugal separation layer, and is arranged in parallel with the condensing tube group; the other end of the water distribution pipe is connected to the bottom of the evaporator; the water distribution pipe is installed with a second cooling water supply pump; wherein the water distribution pipe located above the condensing tube group has at least two nozzles.

[0008] As a preferred embodiment of the steam recovery device of the present invention, the water inlet of the evaporation box has a float valve.

[0009] The circulating cooling system of the present invention comprises the steam recovery device as described in any of the foregoing items, and also comprises a circulating water tower, wherein the condensing pipe group, the rotating centrifugal separation layer and the mist collection net in the steam recovery device are respectively located in the circulating water tower, and the condensing pipe group, the rotating centrifugal separation layer and the mist collection net respectively seal the cross-sections of the circulating water tower at different heights.

[0010] As a preferred embodiment of the circulating cooling system of the present invention, it 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 in the steam recovery device are respectively installed on the tower frame.

[0011] The circulating cooling method of the present invention adopts the steam recovery device described in any one of the above or the circulating cooling system described in any one of the above, and further comprises: Get the steam inside the circulating water tower, condense the steam into water using a mist catcher and collect it; The evaporator coil is used to exchange heat with the collected water to reduce the water to low temperature; The low-temperature water is sprayed from top to bottom in the circulating water tower through a nozzle, so that the sprayed water contacts the steam in the circulating water tower, and the condensed water in the circulating water tower is used to perform heat exchange on the steam in the circulating water tower; the temperature of the steam in the circulating water tower is reduced, more steam can be condensed into water quickly, and the speed and amount of steam discharged upward are reduced, thereby improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost to the outside.

[0012] As a preferred embodiment of the circulating cooling method of the present invention, the remaining steam in the circulating water tower is heat exchanged by using a condenser group; and the water heated by heat exchange in the condenser is supplied to the raw water pool to increase the operating water temperature of the raw water treatment system; The cyclone with a rotating centrifugal separation layer is used to process the remaining steam in the circulating water tower after heat exchange with the condensing tube group, so that the water vapor generates centrifugal force through the cyclone, and water droplets in the rotating water vapor are dispersed on the wall of the guide pipe, and then gradually flow down to the surface of the condensing tube group, the surface of the mist collection net and the circulating water tower.

[0013] As 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 group and the mist collection net, further exchanging heat with the steam in the circulating water tower and improving the heat exchange efficiency of the condenser tube group and the mist collection net.

[0014] Beneficial Effects The present invention solves the above existing problems and other existing problems not mentioned above and accordingly brings at least the following innovative advantages: The steam recovery device, circulating cooling system and circulating cooling method of the present invention recover steam from the perspective of controlling the circulating cooling water concentration process and reducing water vapor evaporation, analyze the water in the water vapor by cooling and condensing the evaporated water vapor in the circulating water tower, and collect the water evaporated and carried away in the concentration process of the circulating water system again. Reducing the evaporation amount can reduce the external water replenishment amount, reduce the entry of external salts, reduce the concentration of salts in the water body, reduce the amount of circulating water discharged, and thus reduce the subsequent processing engineering workload.

[0015] The steam recovery device, circulating cooling system and circulating cooling method of the present invention utilize the condensed water in the circulating water tower to perform heat exchange on the steam in the circulating water tower; and utilize the evaporating coil to perform heat exchange with the collected water, reduce the water to low-temperature water and then spray it into the circulating water tower, thereby greatly improving the efficiency, reducing the steam temperature in the circulating water tower, allowing more steam to condense into water quickly, and reducing the speed and amount of steam discharged upward, thereby improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost to the outside.

[0016] 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 onto the surface of the condenser tube group and the mist collection net, further exchanging heat with the steam in the circulating water tower, and improving the heat exchange efficiency of the condenser tube group and the mist collection net.

[0017] The steam recovery device, circulating cooling system and circulating cooling method of the present invention, from the perspective of energy saving, reuse the warm water discharged from the second pipe. This part of heat is the latent heat released by steam-water conversion and has huge energy. Recovering this part of heat has good economic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall structural effect diagram of the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A area; Figure 3 for Figure 1 A partial enlarged view of the middle B area; Figure 4 for Figure 1 A partial enlarged view of the middle C area; Figure 5 This is a rendering of the mist-catching net of the present invention collecting water droplets.

[0019] In the figure: 1. condenser tube group, 2. condenser tube, 3. heat exchange fin, 4. buffer cold water tank, 5. water 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. rotating centrifugal separation layer, 13. cyclone, 14. guide pipe, 15. mist catcher, 16. water collecting tank, 17. water outlet, 18. evaporation box, 19. overflow, 20. drain tank, 21. water inlet, 22. evaporation coil, 23. condenser, 24. water distribution pipe, 25. second cooling water supply pump, 26. nozzle, 27. float valve, 28. circulating water tower, 29. tower frame. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present disclosure.

[0021] The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only part of the embodiments of the present disclosure, but not all of the embodiments.

[0022] Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present disclosure.

[0023] The steam recovery device of the present invention comprises at least one condenser tube group 1, Figure 1 and Figure 4 The condenser tube set 1 is shown to have a condenser tube 2, such as Figure 4 As shown, the surface of the condenser tube 2 is provided with fixedly connected heat exchange fins 3; 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 tube 2 through a first pipe 6; Figure 3 It is shown that the first pipeline 6 is connected to a first cooling water supply pump 7; the water inlet pipe 5 has a first valve 8, and the first pipeline 6 has a second valve 9; Raw pool 10, Figure 1 It is shown that the water outlet end of the condenser pipe 2 is connected to the raw water pool 10 through the second pipe 11; The centrifugal separation layer 12 is rotated, Figure 1 and Figure 4The rotating centrifugal separation layer 12 is shown to have at least two cyclones 13, each of which has a guide tube 14; the rotating centrifugal separation layer 12 is located vertically above the condenser tube group 1. The cyclone 13 is cylindrical, with propeller blades built in, and is made of new silicon carbide ceramic material, which has anti-corrosion properties.

[0024] like Figure 1 As shown, at least one mist catching net 15 is included, and the mist catching net 15 is at an inclined angle, that is, one side is higher than the other side; It includes a water collection tank 16, Figure 1 and Figure 2 It is shown that the water collection tank 16 is located vertically below the mist catching net 15; the water collection tank 16 has a water outlet 17; Including evaporator box 18, Figure 1 and Figure 2 The evaporation box 18 is shown to be located vertically below the water collecting tank 16; the side of the evaporation box 18 has an overflow port 19; Figure 2 It is shown that the evaporation box 18 has a drainage groove 20 at an inclined angle above, and a water inlet 21 is provided in the drainage groove 20; It includes an evaporation coil 22, which is connected to an expansion valve, a condenser 23 and a compressor installed in the condenser 23; Figure 2 The evaporation coil 22 is shown to be located within the evaporation box 18; Including water distribution pipe 24, see Figure 1 and Figure 2 One end of the water distribution pipe 24 is at least partially located above the condensing tube group 1 but below the rotating centrifugal separation layer 12, and the section of the water distribution pipe 24 located above the condensing tube group 1 is arranged in parallel with the condensing tube group 1; Figure 1 and Figure 2 As shown, the other end of the water distribution pipe 24 is connected to the bottom of the evaporation box 18; the water distribution pipe 24 is installed with a second cooling water supply pump 25; Figure 4 It is shown that the water distribution pipe 24 located above the condensation pipe group 1 has at least two nozzles 26.

[0025] like Figure 2 As shown, the water inlet 21 of the evaporation box 18 has a float valve 27. This embodiment has two usage scenarios. When the float valve 27 is not installed, the water in the water collection tank 16 flows into the evaporation box 18. When the evaporation box 18 is full, the water flows outward from the overflow port 19 and / or the drain tank 20, so that the water flowing outward has a lower water temperature. When the float valve 27 is installed, the float valve 27 drives the water inlet 21 to be opened or closed, so as to better ensure that the water in the evaporation box 18 has a lower temperature.

[0026] The circulating cooling system of this embodiment 2 includes all the solutions of embodiment 1, so the similarities are not repeated here, and only the differences are described. The difference is that, see Figure 1 , also includes a circulating water tower 28, the condensing pipe 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 of high, medium and low in the circulating water tower 28, and the condensing pipe 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.

[0027] See also Figure 1 , including a tower 29, which is fixedly connected to the circulating water tower 28; at least the buffer cold water tank 4, the condenser 23, the first cooling water supply pump 7 and the second cooling water supply pump 25 in the steam recovery device are respectively installed on the tower 29.

[0028] The circulating cooling method of this embodiment 3 adopts the steam recovery device described in embodiment 1 or the circulating cooling system described in embodiment 2, and also includes: The steam in the circulating water tower 28 is obtained, and the steam is condensed into water by the mist capture net 15 and collected; The evaporating coil 22 is used to exchange heat with the collected water to reduce the water to low temperature; The low-temperature water is sprayed from top to bottom in the circulating water tower 28 through the nozzle 26, so that the sprayed water contacts the steam in the circulating water tower 28, and the condensed water in the circulating water tower 28 is used to perform heat exchange on the steam in the circulating water tower 28; the steam temperature in the circulating water tower 28 is reduced, more steam can be condensed into water quickly, and the speed and amount of steam discharged upward are reduced, thereby improving the cooling efficiency of the circulating water tower 28 and reducing the amount of steam lost to the outside.

[0029] Furthermore, the condenser group 1 is used to perform heat exchange on the remaining steam in the circulating water tower 28; and the water heated by heat exchange in the condenser 2 is supplied to the raw water pool 10 to increase the operating water temperature of the raw water treatment system; The cyclone 13 of the rotating centrifugal separation layer 12 is used to process the remaining steam in the circulating water tower 28 after heat exchange with the condensing tube group 1, so that the water vapor generates centrifugal force through the cyclone 13, and water droplets in the rotating water vapor are dispersed on the wall of the guide tube 14, and then gradually flow down to the surface of the condensing tube group 1, the surface of the mist collection net 15 and the circulating water tower 28.

[0030] Furthermore, the low-temperature water is sprayed from top to bottom and at least partially sprayed onto the surface of the condenser tube group 1 and the mist collection net 15, further exchanging heat with the steam in the circulating water tower 28, and improving the heat exchange efficiency of the condenser tube group 1 and the mist collection net 15.

[0031] At present, the circulating water tower 28 releases heat into the atmosphere. In the process of heat release, a large amount of water molecules are carried to form water vapor, which enters the atmosphere through the top of the circulating water tower 28. The original solution uses external water, which will increase scale. Therefore, the steam recovery device, circulating cooling system and circulating cooling method of embodiments 1 to 3 of the present invention have the steps of collecting internal steam for use, not using external water sources, and not adding new scale. First, the mist capture net 15 collects most of the water and flows it into the evaporation box 18, where Figure 5 The effect diagram of the mist catcher 15 gathering water droplets is shown; the water in the evaporation box 18 that is heat exchanged with the evaporation coil 22 can reach a lower water temperature. The first valve 8, the second valve 9 and the first cooling water supply pump 7 are opened to transport the direct cooling water to the condensation tube group 1. The remaining steam after being collected by the mist catcher 15 is heat exchanged with the condensation coil 1 for the second time. The direct cooling water in the condensation tube 2 reduces the surface temperature of the heat exchange fin 3, thereby further reducing the water vapor temperature during the rising process. Most of the water in the water vapor condenses on the surface of the heat exchange fin 3 and the condensation tube 2 to form water droplets, but the condensation process is not completely completed. The water vapor is condensed through the tube group 1, and the water particles gradually increase. When it continues to pass through the rotating centrifugal separation layer 12, due to the action of the cyclone 13 and the guide tube 14, the water vapor flow generates a certain rotational force. The small particles of water collide with each other due to the action of the rotational force, gradually increase, and form large particles of water. The water in the evaporation box 18 undergoes heat exchange through the evaporation coil 22 to form even lower temperature low-temperature water, which is sprayed out through the nozzle 26. On the one hand, it reduces the temperature in the entire circulating water tower 28, and on the other hand, it further increases the amount of water collected from the steam by the mist collection net 15, the condensation coil 1 and the rotating centrifugal separation layer 12, thereby greatly increasing the amount of water collected from the steam.

[0032] Among them, the water discharged from the second pipe 11 is warm water, and the pump water tank 10 can be a high-density sedimentation tank or a flocculation sedimentation tank. The warm water is discharged into the raw water tank 10, which can be used as the inlet water of the raw water pretreatment system, which is beneficial to improve the operating water temperature of the raw water treatment system, especially in winter conditions, when the raw water temperature is low, which helps to improve the operation effect of the sedimentation tank.

[0033] The steam recovery device, circulating cooling system and circulating cooling method of the present invention recover steam from the perspective of controlling the circulating cooling water concentration process and reducing water vapor evaporation, and analyze the water in the water vapor by cooling and condensing the evaporated water vapor in the circulating water tower 28, and collect the water evaporated and carried away in the concentration process of the circulating water system again. Reducing the evaporation amount can reduce the external water replenishment amount, reduce the entry of external salts, reduce the concentration of salts in the water body, reduce the amount of circulating water discharged, and thus reduce the subsequent processing engineering workload.

[0034] The steam recovery device, circulating cooling system and circulating cooling method of the present invention utilize the condensed water in the circulating water tower 28 to perform heat exchange on the steam in the circulating water tower 28; and utilize the evaporating coil 22 to perform heat exchange with the collected water, reduce the water to low-temperature water and then spray it into the circulating water tower 28, thereby greatly improving the efficiency, reducing the steam temperature in the circulating water tower 28, allowing more steam to condense into water quickly, and reducing the speed and amount of steam discharged upward, thereby improving the cooling efficiency of the circulating water tower 28 and reducing the amount of steam lost to the outside.

[0035] 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 onto the surface of the condenser tube group 1 and the mist collection net 15, further exchanging heat with the steam in the circulating water tower 28, and improving the heat exchange efficiency of the condenser tube group 1 and the mist collection net 15.

[0036] The steam recovery device, circulating cooling system and circulating cooling method of the present invention, from the perspective of energy saving, reuse the warm water discharged from the second pipe 11. This part of heat is the latent heat released by steam-water conversion and has huge energy. Recovering this part of heat has good economic effect.

[0037] The words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The preferred embodiments of the present invention described above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the attached claims. For ordinary technicians in this field, other embodiments can be obtained according to the drawings without creative work, and any changes based on the claims of the present invention are within the protection scope of the present invention.

Claims

1. A steam recovery device, characterized in that: include: At least one condenser tube group, the condenser tube group having condenser tubes, the surface of the condenser tubes being provided with fixedly connected heat exchange fins; A buffer cold water tank, the buffer cold water tank having a water inlet pipe, the buffer cold water tank is connected to the water inlet end of the condenser pipe through a first pipe; the first pipe is connected to a first cooling water supply pump; the water inlet pipe has a first valve, and the first pipe has a second valve; A raw water pool, wherein the water outlet end of the condenser pipe is connected to the raw water pool through a second pipe; The rotating centrifugal separation layer has at least two cyclones, each of which has a flow guide tube; the rotating centrifugal separation layer is located vertically above the condensing tube group.

2. The steam recovery device according to claim 1, characterized in that: comprising at least one mist catching net, the mist catching net being at an inclined angle; It comprises a water collecting tank, which is located vertically below the mist catching net; the water collecting tank has a water outlet; The evaporator comprises an evaporator box, which is located vertically below the water collecting tank; the side of the evaporator box has an overflow port; the top of the evaporator box has a drainage groove at an inclined angle, and the drainage groove has a water inlet; It includes an evaporating coil connected to an expansion valve, a condenser and a compressor; the evaporating coil is located in the evaporating box; It includes a water distribution pipe, one end of which is at least partially located above the condensing tube group but below the rotating centrifugal separation layer, and is arranged in parallel with the condensing tube group; the other end of the water distribution pipe is connected to the bottom of the evaporator; the water distribution pipe is installed with a second cooling water supply pump; wherein the water distribution pipe located above the condensing tube group has at least two nozzles.

3. The steam recovery device according to claim 2, characterized in that: The water inlet of the evaporation box is provided with a float valve.

4. Circulating cooling system, characterized in that: The steam recovery device comprises the steam recovery device as described in any one of claims 1 to 3, and further comprises a circulating water tower, wherein the condensing pipe group, the rotating centrifugal separation layer and the mist collecting net in the steam recovery device are respectively located in the circulating water tower, and the condensing pipe group, the rotating centrifugal separation layer and the mist collecting net respectively seal the cross-sections of the circulating water tower at different heights.

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

6. A circulating cooling method, characterized in that: The steam recovery device according to any one of claims 1 to 3 or the circulating cooling system according to any one of claims 4 to 5 further comprises: Get the steam inside the circulating water tower, condense the steam into water using a mist catcher and collect it; The evaporator coil is used to exchange heat with the collected water to reduce the water to low temperature; The low-temperature water is sprayed from top to bottom in the circulating water tower through a nozzle, so that the sprayed water contacts the steam in the circulating water tower, and the condensed water in the circulating water tower is used to perform heat exchange on the steam in the circulating water tower; the temperature of the steam in the circulating water tower is reduced, more steam can be condensed into water quickly, and the speed and amount of steam discharged upward are reduced, thereby improving the cooling efficiency of the circulating water tower and reducing the amount of steam lost to the outside.

7. The circulating cooling method according to claim 6, characterized in that: The remaining steam in the circulating water tower is heat exchanged by using a condenser tube group; and the water heated by heat exchange in the condenser tube is supplied to the raw water pool to increase the operating water temperature of the raw water treatment system; The cyclone with a rotating centrifugal separation layer is used to process the remaining steam in the circulating water tower after heat exchange with the condensing tube group, so that the water vapor generates centrifugal force through the cyclone, and water droplets in the rotating water vapor are dispersed on the wall of the guide pipe, and then gradually flow down to the surface of the condensing tube group, the surface of the mist collection net and the circulating water tower.

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

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