Seawater cooling device and seawater pump control method

Abstract

The application discloses a seawater cooling device and a seawater pump control method, and is characterized in that the device comprises seawater pumps, seawater filters, seawater heat exchangers, devices to be cooled and a seawater pump control system; wherein the seawater pumps are multiple, and water delivery ends of the seawater pumps are connected with seawater inlets of the multiple seawater heat exchangers through the seawater filters; the seawater heat exchangers further comprise fresh water inlets and fresh water outlets, which are used for realizing circulation of fresh water in the seawater heat exchangers and heat exchange between seawater and fresh water; the fresh water inlets and the fresh water outlets are connected with water outlets and water inlets of cooling systems in the multiple devices to be cooled respectively, so as to realize internal cooling of the devices to be cooled by the fresh water; the seawater pump control system collects data from sensors on the seawater pumps, the seawater filters, the seawater heat exchangers and the devices to be cooled, and realizes state control of the seawater pumps based on the data. The application ensures effective heat exchange of the system for air conditioners and other devices to be cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seawater cooling, and more particularly, to a seawater cooling device and a seawater pump control method. BACKGROUND

[0002] At present, with the continuous development of high voltage direct current transmission (HVDC) technology, the characteristics of super-long distance and large capacity power transmission, low cost and small loss make it widely used in China and other countries. In order to effectively solve the problem of large capacity and long distance of offshore wind farm, it is necessary to introduce high voltage direct current transmission technology into offshore wind farm and establish a converter station on the sea.

[0003] The converter station generates a large amount of heat, and in order to ensure the continuous large-scale operation of the converter station, a reliable cooling system needs to be provided for it. The existing converter station cooling system is usually realized by water circulation. However, the location of the offshore converter station makes it difficult to obtain more fresh water resources, and direct use of seawater cooling is easy to cause corrosion of the cooled equipment or cooling system, reducing the service life.

[0004] Background document CN115060105A discloses a seawater heat exchange system, its control device and ship. In the document, the seawater in the seawater heat exchanger is used to cool the fresh water in the fresh water heat exchanger. In addition, the seawater pump is an important component of the seawater cooling device as a seawater driving device, and its safe and stable operation can effectively ensure the cooling requirements of the cooling system and ensure the safe and stable operation of the cooled device.

[0005] However, there are still some problems in the prior art. For example, the seawater pump in the seawater heat exchange system is usually prone to temporary failure of the equipment due to temperature and other factors after a long time of work. If the state of the seawater pump cannot be monitored in time, the cooled device may not be able to exchange heat due to the reduction of seawater heat exchange efficiency.

[0006] In view of the above problems, there is an urgent need for a seawater cooling device and a seawater pump control method. SUMMARY

[0007] To solve the problems in the prior art, the present application provides a seawater cooling device and a seawater pump control method, which realizes the cooling of the cooled device by the combination of seawater pump, seawater filter, seawater heat exchanger, cooled device and seawater pump control system.

[0008] The present application adopts the following technical solutions.

[0009] The first aspect of the present application relates to a seawater cooling device, the device comprising a seawater pump, a seawater filter, a seawater heat exchanger, a device to be cooled, and a seawater pump control system; wherein the seawater pump is multiple, and the water delivery end of the seawater pump is connected with the seawater inlet of the multiple seawater heat exchangers through the seawater filter; the seawater heat exchanger further comprises a fresh water inlet and a fresh water outlet, which are used to realize the circulation of fresh water in the seawater heat exchanger and the heat exchange between seawater and fresh water; the fresh water inlet and the fresh water outlet are connected with the water outlet and the water inlet of the cooling system in the multiple devices to be cooled, so as to realize the internal cooling of the device to be cooled by the fresh water; the seawater pump control system collects data from the sensors on the seawater pump, the seawater filter, the seawater heat exchanger, and the device to be cooled, and realizes the state control of the seawater pump based on the data.

[0010] Preferably, the seawater pump comprises a main seawater pump and a standby seawater pump; wherein each seawater pump is provided with a start-stop controller, and the start-stop controller realizes the start-stop control of the seawater pump based on the seawater pump control system; when the seawater pump control system is started, the start-stop controller of the main seawater pump is in the starting state by default, and the start-stop controller of the standby seawater pump is in the stopping state by default.

[0011] Preferably, the water delivery end of the seawater pump is further provided with a pressure sensor, which is used to detect the pressure of the water delivery end of the seawater pump and transmit the detection result to the seawater pump control system; when the detection result is lower than the protection setting value, the other seawater pump in the stopping state is started.

[0012] Preferably, the seawater inlet and the outlet of the seawater heat exchanger are respectively provided with a temperature sensor and a flow meter, which are used to realize the statistics of the heat exchange amount of the seawater heat exchanger in unit time, and transmit the statistical result to the seawater pump control system; the seawater pump control system simultaneously collects the heat dissipation amount of the cooled device in unit time, and realizes the start-stop control of the seawater pump by comparing the heat exchange amount and the heat dissipation amount.

[0013] Preferably, the seawater heat exchanger is a non-contact plate heat exchanger.

[0014] Preferably, the device further comprises a leak detection tank, the water inlet of the leak detection tank is connected with the water outlet of the seawater filter and the water outlet of the seawater heat exchanger through a drainage pipeline, and the leak detection tank is further provided with a liquid level sensor inside.

[0015] Preferably, the leak detection tank and the drainage pipeline are integrally formed, the leak detection tank is arranged at the end of the drainage pipeline, and the leak detection tank is above the liquid level of the seawater pump, the seawater filter, and the seawater heat exchanger.

[0016] The second aspect of the present application relates to a seawater pump control method, which is implemented by the seawater cooling device of the first aspect of the present application, and comprises the following steps: step 1, collecting the current heat dissipation of the device to be cooled in the seawater cooling device, and estimating the current heat exchange of the seawater pump based on the current heat dissipation; step 2, calculating the number of seawater pumps that should be currently activated based on the rated heat exchange and the current heat exchange of each seawater pump; and step 3, performing start-stop control on the seawater pumps based on the number.

[0017] Preferably, the seawater pump control system also implements power supply switching to supply power to the seawater pumps.

[0018] Preferably, the control system collects the running time of the seawater pumps, and if the running time of the current seawater pump exceeds a set threshold, it is determined whether there is an idle seawater pump in the seawater cooling device, and if so, the current seawater pump is stopped and the idle seawater pump is started.

[0019] The present application has the advantages that, compared with the prior art, the seawater cooling device of the present application implements cooling of the device to be cooled by the combination of a seawater pump, a seawater filter, a seawater heat exchanger, a device to be cooled, and a seawater pump control system. The present application is effective and reliable, and accurately monitors the operation of the system by providing various sensors on each component, thereby ensuring effective heat exchange of the system for air conditioning and other cooling equipment.

[0020] The present application also has the following advantages:

[0021] 1. The present application sets temperature sensors, pressure sensors, flow meters and other sensors at reasonable positions of each device, and realizes monitoring and elimination of various faults through comprehensive analysis and control, and realizes accurate and reasonable heat exchange by reasonably controlling the start, switching and stop of the seawater pumps.

[0022] 2. The method of the present application saves the control energy consumption of the seawater pump, improves the service life of the seawater pump, simplifies the function of the seawater pump, and reduces the cost of the seawater pump. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Figure 1 is a device connection diagram of the seawater cooling device of the present application;

[0024] Figure 2 Figure 2 is a step diagram of the seawater pump control method of the present application;

[0025] Figure 3 Figure 3 is a power supply diagram of the seawater pump in the seawater cooling device of the present application. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present application. The described embodiments of the present application are only a part of the embodiments of the present application, rather than all the embodiments. Based on the spirit of the present application, all other embodiments of the present application not described in the present application, which are obtained by those skilled in the art without creative labor according to the embodiments described in the present application, shall fall within the protection scope of the present application.

[0027] Figure 1 It is a schematic diagram of equipment connection of the seawater cooling device of the present application. As shown in the figure, Figure 1 the first aspect of the present application relates to a seawater cooling device, which comprises a seawater pump, a seawater filter, a seawater heat exchanger, a device to be cooled and a seawater pump control system; wherein the seawater pump is multiple, and the water delivery end of the seawater pump is connected with the seawater inlet of the multiple seawater heat exchangers through the seawater filter; the seawater heat exchanger further comprises a fresh water inlet and a fresh water outlet, which are used to realize the circulation of fresh water in the seawater heat exchanger and the heat exchange between seawater and fresh water; the fresh water inlet and the fresh water outlet are connected with the water outlet and the water inlet of the cooling system in the multiple devices to be cooled respectively, so as to realize the internal cooling of the device to be cooled by fresh water; the seawater pump control system collects data from the sensors on the seawater pump, the seawater filter, the seawater heat exchanger and the device to be cooled, and realizes the state control of the seawater pump based on the data.

[0028] It can be understood that the various equipment in the seawater cooling device in the present application are connected with each other, wherein the number of seawater pumps and the number of devices to be cooled can be reasonably set according to actual demand. It needs to be specially pointed out that the device to be cooled in the present application can not only include those traditional equipment which need to be heat exchanged and cooled, but also can include air conditioners and other devices which need to be precisely temperature controlled. The way of cooling and temperature control for the air conditioners and other devices in the present application can include various ways, for example, it can be realized by adjusting the rotating speed of the seawater pump, or it can be realized by controlling the flow of the seawater inlet and outlet in the seawater heat exchanger, etc.

[0029] Considering that the seawater pump in the prior art also needs to be temperature controlled and temporarily regulated in the case of long-term operation, therefore, a relatively sufficient number of seawater pumps can be provided in the present application.

[0030] The device can also contain multiple seawater filters, for example, one for one backup, three for one backup, etc., so as to realize continuous filtration of impurities in seawater. The seawater filter can be provided with an automatic cleaning function in an embodiment of the present application.

[0031] Preferably, the seawater pump comprises a main seawater pump and a standby seawater pump; each seawater pump is provided with a start-stop controller, which realizes start-stop control of the seawater pump based on a seawater pump control system; when the seawater pump control system is started, the start-stop controller of the main seawater pump is in a start state by default, and the start-stop controller of the standby seawater pump is in a stop state by default.

[0032] In an embodiment of the present application, three main seawater pumps and one standby seawater pump are provided. Each seawater pump is trained to start and stop, and the seawater pump that is started first is stopped before a preset time, and the seawater pump that is started later is stopped later, so that three seawater pumps are in a running state and one seawater pump is in a resting state at each moment through the training mode. Specifically, the seawater pump receives control information provided by the seawater pump control system, thereby realizing start and stop control.

[0033] Preferably, the seawater pump is further provided with a pressure sensor on the water delivery end, which is used for detecting the pressure of the water delivery end of the seawater pump and transmitting the detection result to the seawater pump control system; when the detection result is lower than a protection setting value, the other seawater pump in the stop state is started.

[0034] It can be understood that the seawater pump is provided with a pressure sensor on the water delivery end, which can detect the pressure of the water delivery end of the seawater pump. The seawater pump control system can control the seawater pump or other equipment according to the data in the pressure sensor.

[0035] Preferably, the seawater inlet and outlet of the seawater heat exchanger are respectively provided with temperature sensors and flow meters, which are used for counting the heat exchange amount of the seawater heat exchanger in a unit time and transmitting the counting result to the seawater pump control system; the seawater pump control system simultaneously collects the heat dissipation amount of the cooled device in a unit time, and realizes start-stop control of the seawater pump by comparing the heat exchange amount and the heat dissipation amount.

[0036] It can be understood that the seawater inlet and outlet of the seawater heat exchanger are also provided with temperature sensors and flow meters in the present application. Since the temperature difference and the flow are metered, the actual heat exchange amount of the seawater heat exchanger in a unit time can be obtained, and therefore, through this method, the running efficiency or the start-stop number of the seawater pump can be provided according to the heat dissipation amount required by the cooled device.

[0037] Preferably, the seawater heat exchanger is a non-contact plate heat exchanger. The plate heat exchanger is a new type of high-efficiency and compact heat exchanger that has been developed and widely used in recent decades. It is composed of a series of parallel thin metal plates with corrugated surfaces stacked together, and the spiral plate heat exchanger is more compact and has better heat transfer performance.

[0038] Preferably, the device further comprises a leak detection tank, the water inlets of the leak detection tank are connected with the water outlets of the seawater filter and the seawater heat exchanger through the drain pipeline respectively; and the leak detection tank is further provided with a liquid level sensor inside for detecting the liquid level inside the leak detection tank when the seawater pump is stopped; when the liquid level inside the leak detection tank changes by more than a set value within a short time, a seawater leakage warning is sent through the seawater pump control system.

[0039] It should be noted that the various devices in the application can be made of super duplex steel material, which can prevent the device parts from being corroded by seawater during long-term contact with seawater, thus having excellent performance. In addition, there are a large number of connection points between various parts of the seawater pump, the seawater filter, the seawater heat exchanger and the equipment and the equipment. Some of these connection points are made in the form of flanges, and some are realized in the form of bolt connection points. When the bolt is loose, the connection between the equipment may not be tight and reliable, and there may be a possibility of water leakage. Therefore, the leak detection tank is provided to prevent the problem of water leakage of the entire device from being detected. It is easy to think that the leak detection tank can easily determine whether there is a seawater leakage point inside the seawater cooling device by monitoring the liquid level of the seawater when the seawater cooling device is stopped, thereby ensuring the safety of the entire cooling device and preventing the invalid operation of the seawater pump, prolonging the service life of the seawater pump.

[0040] In the application, when the entire device is in an intermittent stop state, the overall inspection of the device state can be realized through the leak detection tank. In order to realize this inspection, the leak detection tank, the seawater pump in the stopped state, the seawater filter, the seawater heat exchanger and the internal seawater pipeline of the equipment are connected and connected with the outside only through the liquid level of the leak detection tank.

[0041] In this way, if any one device leaks, the liquid level of the leak detection tank will change greatly within a short period of time. At this time, a leakage warning can be sent according to the liquid level sensor inside the leak detection tank. If the liquid level inside the leak detection tank does not change greatly within a short period of time, it means that only normal evaporation of seawater may occur in the leak detection tank, and no leakage occurs in the internal communication pipeline of the seawater.

[0042] Preferably, the leak detection tank and the drain pipeline are integrally formed, the leak detection tank is arranged at the end of the drain pipeline, and the drain pipeline at least includes a vertically arranged pipeline near the leak detection tank, so that the leak detection tank is above the liquid level of the seawater pump, the seawater filter and the seawater heat exchanger.

[0043] In the prior art, the control of the seawater pump is mainly realized by the rotating speed. In order to ensure the cooling performance of seawater to fresh water, the rotating speed of the seawater pump is usually set to be relatively high, so that the seawater pump can fully cool the fresh water. This technology makes the seawater heat exchanger only ensure the heat exchange for some to-be-cooled devices which do not require high accuracy of temperature, and if the to-be-cooled device is an air conditioner or other equipment which needs to accurately control and adjust the temperature, the seawater pump in the prior art needs to accurately and frequently adjust the rotating speed. This makes the seawater pump consume a large amount of energy in the process of frequently adjusting the rotating speed, reduces the service life of the seawater pump, increases the number of rotating speed adjustment gears of the seawater pump, and increases the cost of the seawater pump.

[0044] In the present application, the leak detection tank can be integrally formed with the drain pipe, and the leak detection tank can be cylindrical or other similar shapes, only the end of the drain pipe is designed to be widened. In addition, considering that the leak detection tank in the present application can also be directly connected with the water outlet of the seawater filter, this arrangement also makes the leak detection tank directly receive the remaining seawater provided by the seawater pump which cannot be fully used by the seawater heat exchanger.

[0045] Therefore, when the seawater heat exchanger is an air conditioner or other equipment which needs to accurately control the temperature, the seawater heat exchanger and other equipment can regulate the water inflow of the seawater heat exchanger itself, and the excess seawater can be directly discharged through the leak detection tank. Therefore, the seawater pump no longer needs to accurately control the rotating speed to adjust the water inflow, and still meets the temperature control requirements of the accurate equipment such as the air conditioner. Therefore, in the present application, the leak detection tank is added, so that the accurate temperature control equipment such as the air conditioner can be used as one of the to-be-cooled devices, and the common regulation is realized. At the same time, this method can avoid frequently adjusting the rotating speed of the seawater pump, save the control energy consumption of the seawater pump, improve the service life of the seawater pump, simplify the function of the seawater pump, and reduce the cost of the seawater pump.

[0046] Figure 2 The present application is a seawater pump control method. As shown in Figure 2 The second aspect of the present application relates to a seawater pump control method, which is realized by the seawater cooling device in the first aspect of the present application. The method comprises the following steps: step 1, collecting the current heat dissipation of the to-be-cooled device in the seawater cooling device, and estimating the current heat exchange of the seawater pump based on the current heat dissipation; step 2, calculating the number of seawater pumps that should be started based on the rated heat exchange and the current heat exchange of each seawater pump; and step 3, starting and stopping the seawater pump based on the number.

[0047] It is easy to understand that in the method of the present application, the current heat exchange amount required can be estimated by the current heat dissipation amount of the device to be cooled in the device to be cooled, and after the heat exchange amount is determined, the number of seawater pumps required can be estimated according to the rated heat exchange amount of each seawater pump. Through this simple method, the present application can realize the start-stop control of the seawater pump.

[0048] Specifically, for the seawater heat exchanger, the seawater side of each group plate heat exchanger includes the inlet and outlet temperature and flow, and the actual heat dissipation amount can be calculated as:

[0049]

[0050] Wherein, q is the circulating flow of seawater, which can be measured by a flow meter,

[0051] C is the specific heat capacity of seawater, which is set to 4.08 kJ / (kg·℃) in the present application,

[0052] Δt is the temperature difference between the inlet and outlet of the seawater, which can be measured by a temperature sensor.

[0053] Using the above parameters, the heat transfer realized by the seawater in the seawater heat exchanger, that is, the heat exchange amount Q of the seawater heat exchanger, can be calculated.

[0054] Preferably, the seawater pump control system also uses power switching to supply power to the seawater pump. Figure 3 A schematic diagram of the power supply of the seawater pump in the seawater cooling device of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, the seawater pump in the present application can be started in two different ways, soft start and power frequency start. Both of the two starting methods use the power from the bus after the double power switching to realize the connection between the seawater pump and the power supply. In this way, when a single line fails, it will not affect the stable operation of the seawater pump.

[0055] Preferably, the control system collects the running time of the seawater pump, and if the running time of the current seawater pump exceeds the set threshold, it is determined whether there is an idle seawater pump in the seawater cooling device, and if there is, the current seawater pump is stopped and the idle seawater pump is started.

[0056] The seawater pump control system in the present application can use various ways to collect sensing data and control each device. In an embodiment of the present application, the control of the seawater pump can be realized by using PLC (Programmable Logic Controller).

[0057] As shown in FIG. 1 Figure 1As shown in the embodiment, four seawater pumps are provided, three of which are used and one is a spare, and each seawater pump is powered by two alternating current power supply lines, and the number of seawater pumps in operation is determined according to the heat dissipation of the system. When the water inlet temperature of the to-be-cooled device and the newly added air conditioning system is high, three seawater pumps can be automatically started to cool the to-be-cooled device and the air conditioner. When the to-be-cooled device and the air conditioner are in operation, the seawater pump is not completely stopped, but the number of seawater pumps is adjusted to ensure that the heat exchange performance of the device meets the requirements.

[0058] In the present application, the seawater pump can be switched at a fixed time or when a fault occurs. Specifically, the seawater pump can be switched periodically by a switching period, and the length of the period can be considered as a setting. For example, after #1 seawater pump runs continuously for 12 hours without any fault, the seawater pump control system in the present application can start the seawater pump automatic switching logic to ensure that the standby seawater pump is put into soft start operation while the #1 main seawater pump is stopped.

[0059] In addition, when the seawater pump overheats, the soft starter alarms, and the power supply alarms, the operation state of the seawater pump can be switched, for example, from the main pump to the standby pump. In addition, a pressure sensor is arranged at the outlet of each seawater pump, and when the measured value of the pressure sensor is lower than the protection setting value, the standby pump is switched to soft start operation.

[0060] In the above switching process, if the current seawater pump fails to switch to the standby pump and there is no other available standby pump, the original seawater pump in operation can be switched back.

[0061] The seawater cooling device in the present application can ensure the cooling requirements of the entire offshore direct current converter station. Since the power consumption of the seawater pump is large, the control method can accurately control the number of seawater pumps to start and stop according to the heat generated by the to-be-cooled device, thereby reducing the power consumption; the seawater pump is controlled by polling through the timing switching, thereby prolonging the service life of the seawater pump; and the reliability of the seawater cooling device is improved through the fault switching.

[0062] The seawater cooling device of the present application has the advantages that, compared with the prior art, the seawater cooling device of the present application is combined with a seawater pump, a seawater filter, a seawater heat exchanger, a to-be-cooled device, and a seawater pump control system to cool the to-be-cooled device. The present application is effective and reliable, and various sensors are arranged on each element to accurately monitor the operation of the system, thereby ensuring the effective heat exchange of the system for the air conditioner and other to-be-cooled devices.

[0063] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A seawater cooling device, characterized in that: the device comprises seawater pumps, seawater filters, seawater heat exchangers, devices to be cooled, and a seawater pump control system; wherein, the seawater pumps are multiple, and the water delivery ends of the seawater pumps are connected to the seawater inlets of multiple seawater heat exchangers through the seawater filters; the seawater heat exchangers further comprise fresh water inlets and outlets for realizing the circulation of fresh water in the seawater heat exchangers and the heat exchange between seawater and fresh water; the fresh water inlets and outlets are connected to the water outlets and inlets of the cooling systems in multiple devices to be cooled, so as to realize the internal cooling of the devices to be cooled by the fresh water; the seawater pump control system collects data from sensors on the seawater pumps, seawater filters, seawater heat exchangers, and devices to be cooled, and realizes the state control of the seawater pumps based on the data; the device further comprises a leak detection tank, the water inlets of the leak detection tank are connected to the water outlets of the seawater filters and the water outlets of the seawater heat exchangers through drainage pipelines, and a liquid level sensor is further arranged in the leak detection tank; the leak detection tank and the drainage pipeline are integrally formed, the leak detection tank is arranged at the end of the drainage pipeline, and the leak detection tank is above the liquid level of the seawater pumps, seawater filters, and seawater heat exchangers; the leak detection tank is cylindrical and is designed to be widened only at the end of the drainage pipeline.

2. The seawater cooling device according to claim 1, characterized in that: the seawater pumps comprise main seawater pumps and standby seawater pumps; wherein, each seawater pump is provided with a start-stop controller, and the start-stop controller realizes the start-stop control of the seawater pump based on the seawater pump control system; when the seawater pump control system is started, the start-stop controller of the main seawater pump is in the starting state by default, and the start-stop controller of the standby seawater pump is in the stopping state by default.

3. The seawater cooling device according to claim 2, characterized in that: the water delivery end of the seawater pump is further provided with a pressure sensor, the pressure sensor is used for detecting the pressure of the water delivery end of the seawater pump and transmitting the detection result to the seawater pump control system; when the detection result is lower than the protection setting value, the other seawater pump in the stopping state is started.

4. The seawater cooling device according to claim 3, characterized in that: the seawater inlets and outlets of the seawater heat exchangers are respectively provided with temperature sensors and flow meters, the temperature sensors and flow meters are used for realizing the statistics of the heat exchange amount of the seawater heat exchanger in unit time and transmitting the statistical result to the seawater pump control system; the seawater pump control system simultaneously collects the heat dissipation amount of the cooled device in unit time, and realizes the start-stop control of the seawater pump by comparing the heat exchange amount and the heat dissipation amount.

5. The seawater cooling device according to claim 4, characterized in that: the seawater heat exchanger is a non-contact plate heat exchanger.

6. A seawater pump control method, characterized in that: the method is realized by using the seawater cooling device according to any one of claims 1-5; and the method comprises the following steps: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Step 1, collecting the current heat dissipation of the device to be cooled in the seawater cooling device, and estimating the current heat exchange capacity of the seawater pump based on the current heat dissipation; Step 2, calculating the number of seawater pumps that should be currently started based on the rated heat exchange capacity of each seawater pump and the current heat exchange capacity; Step 3, starting and stopping the seawater pumps based on the number.

7. The seawater pump control method according to claim 6, characterized in that: the seawater pump control system further adopts a power switching mode to supply power to the seawater pumps.

8. The seawater pump control method according to claim 7, characterized in that: the seawater pump control system collects the running time of the seawater pumps, and if the running time of the current seawater pump exceeds a set threshold, it is determined whether there is an idle seawater pump in the seawater cooling device, and if there is, the current seawater pump is stopped and the idle seawater pump is started. ​ ​

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