Water circulation system of offshore converter station

Abstract

The utility model relates to the technical field of seawater desalination, and discloses an offshore converter station water circulation system which comprises a seawater lift pump, a main filter, a first primary heat exchanger and a seawater desalination system, a water suction port of the seawater lift pump is located below the sea level, and a water outlet of the seawater lift pump is connected with an inlet of the main filter; an outlet of the main filter is connected with a first input end of the first primary heat exchanger and a first inlet of the seawater desalination system; a second output end and a second input end of the first primary heat exchanger are connected with a heat exchange port of the heating and ventilation system through a cooling pipeline; a condensate water outlet of the heating and ventilation system is connected with a second inlet of the seawater desalination system through a condensation pipeline. According to the seawater desalination system disclosed by the utility model, the condensed water generated by the heating and ventilation system can be collected and desalinated to output fresh water, so that the conditions of precipitation and corrosion of silt and minerals in the seawater desalination system are reduced, and the service life of a water circulation system is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of seawater desalination, in particular to a water circulation system for an offshore converter station. Background Art

[0002] The converter station of the offshore wind power flexible DC transmission platform is often designed in unmanned mode. The cooling water circulation system, HVAC system, fire protection system and domestic water system of the converter station must meet the requirements of maintenance-free or automatic maintenance. However, in actual use, the circulating water of each system needs to be replenished in time due to use, evaporation, overflow, leakage, siphonage and other reasons. At the same time, when a manned living platform is set up, domestic water relies on ship water supply and cannot be replenished cheaply. When only the filtered seawater is used as the system water source, the seawater sediment, microorganisms, corrosive minerals, etc. in the sea area will reduce the service life of the seawater desalination system. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to solve the problem in the prior art that sufficient fresh water cannot be provided for an offshore converter station only by lifting seawater, thereby providing a water circulation system for an offshore converter station.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] The utility model provides a water circulation system of an offshore converter station, comprising: a seawater lifting pump, a main filter, a first-stage heat exchanger and a seawater desalination system, wherein the seawater lifting pump has a water inlet located below the sea level, and a water outlet connected to the inlet of the main filter, and is used to pump seawater into the main filter; the main filter has an outlet connected to a first input end of the first-stage heat exchanger and a first inlet of the seawater desalination system, and is used to filter impurities in the seawater and then send the seawater into the first-stage heat exchanger and the seawater desalination system; the first-stage heat exchanger has a second output end and a second The input end is connected to the heat exchange port of the HVAC system through a cooling pipe, which is used to cool the HVAC system with seawater as a cold source, and then discharge the circulated seawater into the sea through the first output end through the outlet pipe; the HVAC system, its condensate outlet is connected to the second inlet of the seawater desalination system through a condensation pipe; the seawater desalination system is used to collect the seawater output by the main filter and the condensate generated during the cooling process of the HVAC system, and after desalination treatment of the seawater and the condensate, replenish fresh water for the equipment in the converter station; an external cooling water circulation system is formed between the first-stage heat exchanger and the HVAC system.

[0006] The utility model provides a water circulation system for an offshore converter station. The desalination system collects condensed water generated by a heating and ventilation system on the basis of collecting and lifting seawater. The desalination system replenishes fresh water for the equipment after desalinating the condensed water and seawater. Since the content of sediment and minerals in the condensed water is less than that in the seawater, the use of condensed water for desalination can reduce corrosion to the desalination system and reduce sediment deposition in the system, thereby extending the service life of the equipment of the desalination system. In addition, the desalination system is supplied with water through two water sources to ensure sufficient fresh water reserves, providing reliable protection for the normal use of the equipment of the offshore converter station and the normal life of the personnel.

[0007] In an optional embodiment, the water circulation system of the offshore converter station also includes: a second-level heat exchanger and multiple secondary heat exchangers, wherein the second-level heat exchanger has a first input end connected to the outlet of the main filter, a first output end connected to the sea through a water outlet pipe, a second output end connected to the first input end of each secondary heat exchanger, and a second input end connected to the first output end of each secondary heat exchanger, which is used to isolate and heat exchange the seawater output from the main filter and then input the seawater into each secondary heat exchanger; the second output end and the second input end of each secondary heat exchanger are connected to the heat exchange port of an electrical equipment through a cooling pipe; after the secondary heat exchanger uses the seawater as a cold source to cool the electrical equipment, the secondary heat exchanger discharges the circulated seawater into the sea through the second-level heat exchanger; an internal cooling water circulation system is formed between the secondary heat exchanger and the electrical equipment; and an intermediate water circulation system is formed between the second-level heat exchanger and the secondary heat exchanger.

[0008] The offshore converter station water circulation system provided by the utility model is equipped with a first-level heat exchanger and a second-level heat exchanger respectively, which can separate the HVAC system from the electrical equipment to prevent the two types of equipment from affecting each other; each electrical equipment is isolated from the second-level heat exchanger by a second-level heat exchanger, which ensures that the electrical equipment is fully cooled while ensuring that the cooling circulation and heat exchange between the various devices are carried out normally without interfering with each other.

[0009] In an optional embodiment, the seawater desalination system replenishes circulating fresh water for the HVAC system through the water replenishment port of the HVAC system.

[0010] In an optional embodiment, the seawater desalination system replenishes fresh water for the water seal of the accident oil pool through the water replenishment port of the water seal well.

[0011] In an optional embodiment, the HVAC system includes a plurality of HVAC fans arranged in different machine rooms, and the offshore converter station water circulation system also includes: a dehumidifier and a water tank arranged in the machine room, wherein the water tank is arranged below the dehumidifier; the outlet of each water tank is connected to the condensation pipe through a condensation branch pipe; after the dehumidifier collects and aggregates the condensed water generated by the HVAC fans into the water tank, the condensed water flows into the seawater desalination system through the condensation branch pipe and the condensation pipe in turn.

[0012] The utility model provides a water circulation system for an offshore converter station, wherein the dehumidifier can quickly collect condensed water from a heating and ventilation fan and moisture in the air, thereby increasing the amount of water collected.

[0013] In an optional embodiment, a three-way valve is provided on the condensation branch pipe; when the HVAC fan is cut off, the three-way valve is used to discharge the condensed water in the condensation branch pipe and the water tank.

[0014] The utility model provides an offshore converter station water circulation system, and when the HVAC fan needs to be removed for maintenance, the condensed water in the condensation branch pipe and the water tank of the HVAC system can be conveniently and quickly discharged through the three-way valve.

[0015] In an optional embodiment, the seawater desalination system includes: a raw water tank, a seawater desalination device and a clean water tank, wherein the raw water tank has a first inlet connected to the outlet of the main filter, a second inlet connected to the outlet of each water tank through a condensation pipe, and an outlet connected to the inlet of the seawater desalination device, and is used to collect seawater output by the main filter and condensed water generated during the cooling process of each HVAC fan; the seawater desalination device has an outlet connected to the inlet of the clean water tank, and is used to desalinate the seawater and condensed water in the raw water tank and then output fresh water; the clean water tank is used to store fresh water and replenish fresh water for the equipment in the converter station.

[0016] In an optional embodiment, the raw water tank includes an overflow port; the overflow port is used to discharge excess water in the raw water tank.

[0017] In an optional embodiment, the offshore converter station water circulation system also includes: a seawater sedimentation overflow water tank, whose inlet is connected to the outlet of the main filter, and whose outlet is connected to the first inlet of the raw water tank, which is used to precipitate the silt in the seawater output by the main filter and then discharge the overflow clean seawater.

[0018] The utility model provides a water circulation system for an offshore converter station. After the seawater sedimentation overflow water tank precipitates impurities such as mud and sand in the water, the overflow clean seawater is discharged to the raw water tank through the outlet. By preliminarily filtering the impurities in the water, the burden on the back-end equipment is reduced, thereby increasing the service life of the seawater desalination system.

[0019] In an optional embodiment, the offshore converter station water circulation system also includes: an electric valve, which is arranged on the pipeline between the outlet of the main filter and the first inlet of the raw water tank; when the electric valve is closed, the raw water tank only collects condensed water generated during the cooling process of each HVAC fan.

[0020] The offshore converter station water circulation system provided by the utility model can control the opening or closing of the electric valve through remote electrical control, thereby improving the automation degree of the water circulation system and facilitating remote operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A composition diagram of a specific example of a water circulation system for an offshore converter station according to an embodiment of the utility model;

[0023] Figure 2 A composition diagram of another specific example of the offshore converter station water circulation system according to an embodiment of the utility model;

[0024] Figure 3 The present invention is a composition diagram of a specific example of a seawater desalination system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] The utility model provides a water circulation system for an offshore converter station, such as Figure 1 As shown, it includes: a seawater lifting pump 1, a main filter 2, a first stage heat exchanger 3 and a seawater desalination system 4.

[0030] like Figure 1 As shown, the seawater lifting pump 1 has a water inlet below the sea level, and its outlet is connected to the inlet of the main filter 2, which is used to pump seawater into the main filter 2; the main filter 2 has an outlet connected to the first input end of the first primary heat exchanger 3 and the first inlet of the seawater desalination system 4, which is used to filter impurities in the seawater and then send the seawater into the first primary heat exchanger 3 and the seawater desalination system 4; the first primary heat exchanger 3 has a second output end and a second input end connected to the heat exchange port of the HVAC system 5 through a cooling pipe, which is used to use the seawater as a cold source to cool the HVAC system 5, and then discharge the circulated seawater into the sea through the first output end and the outlet pipe. The HVAC system 5 has a condensate outlet connected to the second inlet of the seawater desalination system 4 through a condensation pipe.

[0031] Figure 1 In the figure, the seawater desalination system 4 is used to collect the seawater output by the main filter 2 and the condensed water generated during the cooling process of the HVAC system 5, and after desalination treatment of the seawater and the condensed water, replenish fresh water for the equipment in the converter station; an external cooling water circulation system is formed between the first-stage heat exchanger 3 and the HVAC system 5.

[0032] Specifically, Figure 1 In the figure, the seawater lifting pump 1 is located in the seawater pump shaft, which extends from the platform of the offshore converter station to the lower end of the water suction port of the seawater lifting pump 1. The seawater pump shaft is used to prevent marine organisms, marine floating objects and debris from impacting and disturbing the seawater lifting pump 1. The seawater lifting pump 1 is a submersible pump, which pumps seawater to the platform of the offshore converter station when started, and supplies water to the cooling circulation system and water circulation system of the offshore converter station equipment.

[0033] Specifically, Figure 1 In the process, the seawater lifting pump 1 first lifts the seawater to the main filter 2, and after filtering out larger particles, silt and impurities in the seawater, the main filter sends the seawater to the seawater desalination system 4 through one pipeline, and sends the seawater to the first-stage heat exchanger 3 through another pipeline. The first-stage heat exchanger 3 uses seawater as a cold source, cools the HVAC system 5, recovers the circulated seawater, and discharges it into the sea through the first output end through the outlet pipe, thereby realizing the heat exchange of the cooling cycle of the HVAC system 5. In the process of cooling the HVAC system 5 by the first-stage heat exchanger 3, condensed water will be generated on the outer wall of the HVAC system pipe. After the condensed water is collected and aggregated into the seawater desalination system 4, the seawater desalination system 4 desalinates the seawater and condensed water transported by the main filter 2, thereby outputting fresh water to replenish fresh water for the equipment in the converter station.

[0034] For example, Figure 1 In the operation, the operator can control the opening and closing states of the first inlet and the second inlet of the seawater desalination system 4. Since there are still silt, minerals or other solid impurities in the seawater transported by the main filter 2, and there are fewer impurities in the condensed water, in order to reduce the deposition and corrosion of impurities in the seawater in the seawater desalination system 4, the operator can close the first inlet of the seawater desalination system 4, and only open the second inlet to collect the condensed water and desalinate the condensed water, thereby extending the service life of the seawater desalination system 4. When the demand for fresh water is large and the condensed water is insufficient to meet the demand for fresh water, the operator can open the first inlet and the second inlet of the seawater desalination system 4 at the same time, and desalinate the seawater and condensed water at the same time, so as to increase the output of fresh water and meet the water supply demand.

[0035] The water circulation system of the offshore converter station provided in this embodiment, the desalination system, on the basis of collecting and lifting seawater, adds a channel for collecting condensed water generated by the HVAC system. The desalination system replenishes fresh water for the equipment after desalination of the condensed water and seawater. Since the content of sediment and minerals in the condensed water is less than that in the seawater, the use of condensed water for desalination can reduce the corrosion of the desalination system and the deposition of sediment in the system, thereby extending the service life of the equipment of the desalination system. In addition, the desalination system is supplied with water through two water sources to ensure sufficient fresh water reserves, providing reliable protection for the normal use of the equipment of the offshore converter station and the normal life of the personnel.

[0036] In some optional embodiments, such as Figure 2As shown, the water circulation system of the offshore converter station also includes: a second primary heat exchanger 6 and multiple secondary heat exchangers 7, wherein the second primary heat exchanger 6 has a first input end connected to the outlet of the main filter 2, a first output end connected to the sea through a water outlet pipe and a leak detection pipe, a second output end connected to the first input end of each secondary heat exchanger 7, and a second input end connected to the first output end of each secondary heat exchanger 7, which is used to isolate and heat exchange the seawater output from the main filter 2 and then input the seawater into each secondary heat exchanger 7.

[0037] like Figure 2 As shown, the second output end and the second input end of each secondary heat exchanger 7 are connected to the heat exchange port of an electrical device through a cooling pipe; after the secondary heat exchanger 7 uses seawater as a cold source to cool the electrical equipment, the secondary heat exchanger 7 discharges the circulated seawater into the sea through the second first-stage heat exchanger 6; an internal cooling water circulation system is formed between the secondary heat exchanger 7 and the electrical equipment; and an intermediate water circulation system is formed between the second first-stage heat exchanger 6 and the secondary heat exchanger 7.

[0038] For example, Figure 2 Taking the valve hall and transformer as examples of electrical equipment including two secondary heat exchangers 7, the main filter 2 sends the filtered seawater into the second primary heat exchanger 6, and the second primary heat exchanger 6 then sends the seawater into each secondary heat exchanger 7. The two secondary heat exchangers 7 use the seawater as a cold source to circulate and cool the valve hall and the transformer, and the circulated seawater is collected into the second primary heat exchanger 6 through each secondary heat exchanger 7. The second primary heat exchanger 6 discharges the circulated seawater into the sea through the leak detection tank. Since the second primary heat exchanger 6 and the secondary heat exchanger 7 are provided with two-stage heat exchangers, it can ensure that the electrical equipment is fully exchanged, and the cooling cycle and heat exchange between the various electrical equipment can proceed normally without interfering with each other.

[0039] For example, Figure 2 In the offshore converter station, a three-circulation structure is often used. The three-circulation water cooling system provides a cold source for the equipment in the station. It is divided into three parts: external cooling water circulation, intermediate water circulation and internal cooling water circulation. Seawater is used as the cooling medium of the external cooling water circulation to provide the system cold source. At the same time, it is used as the system water source after passing through the main filter 2 and the seawater desalination system 4. Among them,

[0040] (1) Internal cooling water circulation system: The internal cooling medium of the electrical equipment converter valve absorbs the heat of the electrical equipment and its temperature rises. After the temperature rises, heat exchange is carried out in the intermediate water circulation system of the secondary heat exchanger 7. The internal cooling medium flows back to the equipment after the temperature drops.

[0041] (2) Intermediate circulation: The secondary heat exchanger 7 exchanges and absorbs the heat of the internal circulation system to increase the temperature, and the primary heat exchanger exchanges heat with the external cooling water to cool it down, providing a heat exchange cold source for the internal cooling circulation system. By setting up the intermediate circulation, the conductivity and corrosion of the external circulating seawater can be reduced to reduce the impact of the internal cooling circulation directly involved in the electrical equipment.

[0042] (3) External circulation: The circulation mainly provides heat exchange cold source for the intermediate cooling circulation and HVAC system 5. The cooling medium is seawater, which is injected back into the sea after heat exchange.

[0043] It should be noted that the number and stages of heat exchangers can be set according to the number of electrical equipment and the cooling requirements of the electrical equipment, and are not limited here.

[0044] In an optional embodiment, if Figure 2 As shown, the seawater desalination system 4 replenishes circulating fresh water for the HVAC system 5 through the water replenishment port of the HVAC system 5; the seawater desalination system 4 replenishes fresh water for the water seal of the accident oil pool through the water replenishment port of the water seal well.

[0045] For example, Figure 2 The fresh water produced by the seawater desalination system 4 can be used to replenish water for various equipment in the offshore converter station, such as replenishing water for the living platform to meet the survival needs of personnel; it can also be used to replenish water for fire-fighting equipment in the fire-fighting system, such as fire-fighting water tanks, fine water mist water tanks, and helicopter foam water tanks; it can also be used to supplement circulating water for the HVAC system 5 and replenish water for the water seal of the accident oil pool.

[0046] In some optional embodiments, such as Figure 3 As shown, the HVAC system includes a plurality of HVAC fans 8 arranged in different machine rooms, and the offshore converter station water circulation system also includes: a dehumidifier 9 and a water tank 10 arranged in the machine room, wherein the water tank 10 is arranged below the dehumidifier 9; the outlet of each water tank 10 is connected to the condensation pipe 12 through a condensation branch pipe 11; after the dehumidifier 9 collects and aggregates the condensed water generated by the HVAC fans 8 into the water tank 10, the condensed water flows into the seawater desalination system 4 through the condensation branch pipe 11 and the condensation pipe 12 in sequence. A three-way valve 13 is arranged on the condensation branch pipe 11; when the HVAC fans 8 are cut off, the three-way valve 13 is used to discharge the condensed water in the condensation branch pipe 11 and the water tank 10.

[0047] For example, Figure 3In the embodiment, each machine room can be arranged on each floor of the offshore converter station, the desalination system 4 can be arranged on the first floor, and the dehumidifier 9 is used to collect the condensed water on the outer wall of the pipe and the water vapor in the air during the cooling process of the HVAC fan 8, and collect them into the water tank 10. The water tank 10 collects the internal condensed water into the condensation pipe 12 through the condensation branch pipe 11 connected to the drain port, so that the desalination system 4 can collect the condensed water discharged from the water tanks in the machine rooms on each floor through the condensation pipe 12. When the HVAC fan 8 needs to be removed for maintenance, the condensed water in the condensation branch pipe 11 and the water tank 10 can be conveniently and quickly discharged by opening the three-way valve 13, wherein the three-way valve 13 can be manually controlled or electrically controlled.

[0048] In some optional embodiments, such as Figure 3 As shown, the seawater desalination system 4 includes: a raw water tank 41, a seawater desalination device 42 and a clean water tank 43, wherein the raw water tank 41 has a first inlet connected to the outlet of the main filter 2, a second inlet connected to the outlet of each water tank 10 through a condensation pipe 12, and an outlet connected to the inlet of the seawater desalination device 42, which is used to collect the seawater output by the main filter 2 and the condensed water generated during the cooling process of each HVAC fan 8; the seawater desalination device 42 has an outlet connected to the inlet of the clean water tank 43, which is used to desalinate the seawater and condensed water in the raw water tank 41 and then output fresh water; the clean water tank 43 is used to store fresh water and replenish fresh water for the equipment in the converter station.

[0049] Figure 3 In the embodiment, the raw water tank 41 includes an overflow port; the overflow port is used to discharge the excess water in the raw water tank 41. The water circulation system of the offshore converter station also includes: a seawater sedimentation overflow water tank 14 and an electric valve 15, wherein the seawater sedimentation overflow water tank 14 has an inlet connected to the outlet of the main filter 2, and an outlet connected to the first inlet of the raw water tank 41, and is used to precipitate the sediment in the seawater output by the main filter 2 and then discharge the overflow clean seawater. The electric valve 15 is arranged on the pipeline between the outlet of the main filter 2 and the first inlet of the raw water tank 41; when the electric valve 15 is closed, the raw water tank 41 only collects the condensed water generated during the cooling process of each HVAC fan 8.

[0050] Exemplarily, the electric valve 15 can be set on the pipeline between the outlet of the raw water tank and the inlet of the seawater desalination device 42, on the pipeline between the outlet of the seawater desalination device 42 and the inlet of the clean water tank 43, or on any other liquid pipeline, so as to control the liquid flow in the pipeline by controlling the on-off state of the electric valve 15.

[0051] Specifically, Figure 3In the process, after the seawater passes through the main filter 2 to filter out impurities, it enters the seawater sedimentation overflow water tank 14 through the electric valve 15. After the silt and minerals in the seawater are precipitated in the seawater sedimentation overflow water tank 14, the clean seawater enters the raw water tank 41 through the outlet of the seawater sedimentation overflow water tank 14. The seawater passes through the main filter 2 and the seawater sedimentation overflow water tank 14 to reduce the content of impurities such as silt and minerals. The filtered seawater and condensed water are stored in the raw water tank 41. When there is too much water in the raw water tank, the excess raw water can be discharged through the overflow port.

[0052] Specifically, Figure 3 In the process, the seawater and condensed water in the raw water tank 41 are desalinated by the seawater desalination device 42. During the treatment process, the seawater desalination device 42 discharges impurities through the bottom outlet to prevent the impurities from depositing and affecting the efficiency of the desalination treatment and the service life of the device. The desalinated fresh water is stored in the clean water tank 43 as the fresh water source of the offshore converter station water circulation system. The fresh water can be passed through the corresponding pipelines, and the water circulation pump and pressure pipe are used to replenish fresh water for the domestic water tank and various equipment.

[0053] It should be noted that by controlling the on / off state of the electric valve 15, it is possible to control whether seawater flows into the first inlet of the raw water tank. When the electric valve 15 is closed at ordinary times, the raw water tank 41 only collects condensed water and desalinates the condensed water, thereby extending the service life of the seawater desalination system 4; when the demand for fresh water is large, or when the condensation pipe and HVAC system are under maintenance, the condensed water is insufficient to meet the demand for fresh water, and the operator can open the electric valve 15 to allow seawater to flow into the raw water tank, and at the same time desalinate the seawater and condensed water, thereby increasing the output of fresh water and meeting the water supply demand.

[0054] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A water circulation system for an offshore converter station, characterized in that: include: Seawater lifting pump, main filter, first stage heat exchanger and seawater desalination system, including: A seawater lifting pump, whose water inlet is located below the sea level and whose water outlet is connected to the inlet of the main filter, and is used to pump seawater into the main filter; A main filter, whose outlet is connected to the first input end of the first-stage heat exchanger and the first inlet of the seawater desalination system, and is used to filter impurities in seawater and then send the seawater into the first-stage heat exchanger and the seawater desalination system; The first stage heat exchanger, whose second output end and second input end are connected to the heat exchange port of the HVAC system through a cooling pipe, is used to use seawater as a cold source to cool the HVAC system, and then discharge the circulated seawater into the sea through the first output end and the outlet pipe; A HVAC system, wherein a condensate outlet thereof is connected to a second inlet of the seawater desalination system via a condensate pipe; The seawater desalination system is used to collect the seawater output by the main filter and the condensed water generated during the cooling process of the HVAC system, and after desalination treatment of the seawater and the condensed water, replenish fresh water for the equipment in the converter station; An external cooling water circulation system is formed between the first-stage heat exchanger and the HVAC system.

2. The offshore converter station water circulation system according to claim 1, characterized in that: Also includes: The second primary heat exchanger and multiple secondary heat exchangers, wherein, A second primary heat exchanger, whose first input end is connected to the outlet of the main filter, whose first output end is connected to the sea through the outlet pipe, whose second output end is connected to the first input end of each of the secondary heat exchangers, and whose second input end is connected to the first output end of each of the secondary heat exchangers, is used to isolate and heat-exchange the seawater output from the main filter and then input the seawater into each of the secondary heat exchangers; The second output end and the second input end of each of the secondary heat exchangers are connected to a heat exchange port of an electrical device through a cooling pipe; After the secondary heat exchanger uses the seawater as a cold source to cool the electrical equipment, the secondary heat exchanger discharges the circulated seawater into the sea through the second primary heat exchanger; An internal cooling water circulation system is formed between the secondary heat exchanger and the electrical equipment; An intermediate water circulation system is formed between the second-stage heat exchanger and the second-stage heat exchanger.

3. The offshore converter station water circulation system according to claim 1, characterized in that: The seawater desalination system replenishes circulating fresh water for the HVAC system through the water replenishment port of the HVAC system.

4. The offshore converter station water circulation system according to claim 1, characterized in that: The seawater desalination system replenishes fresh water for the water seal of the accident oil pool through the water replenishment port of the water seal well.

5. The offshore converter station water circulation system according to claim 1, characterized in that: The HVAC system includes a plurality of HVAC fans arranged in different machine rooms, and the offshore converter station water circulation system also includes: a dehumidifier and a water tank arranged in the machine room, wherein: a water tank, which is arranged below the dehumidifier; The outlet of each water tank is connected to the condensation pipeline through a condensation branch pipe; After the dehumidifier collects the condensed water generated by the HVAC fan and collects it in the water tank, the condensed water flows into the seawater desalination system through the condensation branch pipe and the condensation pipeline in sequence.

6. The offshore converter station water circulation system according to claim 5, characterized in that: A three-way valve is provided on the condensation branch pipe; When the HVAC fan is cut off, the three-way valve is used to discharge the condensed water in the condensation branch pipe and the water tank.

7. The offshore converter station water circulation system according to claim 6, characterized in that: The seawater desalination system comprises: a raw water tank, a seawater desalination device and a clean water tank, wherein: A raw water tank, whose first inlet is connected to the outlet of the main filter, whose second inlet is connected to the outlet of each water tank through the condensation pipeline, and whose outlet is connected to the inlet of the seawater desalination device, and which is used to collect the seawater output by the main filter and the condensed water generated during the cooling process of each HVAC fan; A seawater desalination device, whose outlet is connected to the inlet of the clean water tank, and is used to desalinate the seawater and condensed water in the raw water tank and then output fresh water; A clean water tank is used to store fresh water and replenish fresh water for the equipment in the converter station.

8. The offshore converter station water circulation system according to claim 7, characterized in that: The raw water tank includes an overflow port; The overflow port is used to discharge excess water in the raw water tank.

9. The offshore converter station water circulation system according to claim 7, characterized in that: Also includes: The seawater sedimentation overflow water tank has an inlet connected to the outlet of the main filter and an outlet connected to the first inlet of the raw water tank, and is used to discharge overflow clean seawater after sedimentation in the seawater output by the main filter.

10. The offshore converter station water circulation system according to claim 7, characterized in that: Also includes: an electric valve, which is arranged on a pipeline between the outlet of the main filter and the first inlet of the raw water tank; When the electric valve is closed, the raw water tank only collects condensed water generated during the cooling process of each HVAC fan.

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