Automatic anti-fouling device for a marine vessel cooling system and marine vessel

Abstract

This invention relates to the field of marine cooling systems, specifically an automatic antifouling device for marine cooling systems and the corresponding vessel. The automatic antifouling device includes a centralized seawater heat exchanger, an ultrasonic generator, a power supply, and a switch control assembly. The outer wall of the heat exchange tubes of the centralized seawater heat exchanger is coated with a piezoelectric coating. The centralized seawater heat exchanger facilitates heat exchange between the ship's heat source and seawater. The ultrasonic generator is correspondingly installed with the centralized seawater heat exchanger and transmits ultrasonic waves to it. The power supply is electrically connected to the ultrasonic generator. The switch control assembly is connected between the power supply and the ultrasonic generator and controls the switching between the power supply and the ultrasonic generator based on the ship's speed or the flow rate of the seawater in the centralized seawater heat exchanger. This application enables timed automatic cleaning of the marine cooling system heat exchanger, improving the long-term operational reliability of the marine cooling system.

Description

Technical Field

[0001] This invention relates to the field of marine cooling systems, and more particularly to an automatic antifouling device for marine cooling systems and a ship. Background Technology

[0002] Marine cooling systems are critical systems in marine engineering used to cool heat sources such as generator sets and electromechanical equipment. Their main function is to promptly remove the heat generated during equipment operation by circulating seawater or other cooling media, ensuring efficient operation within normal temperature ranges and preventing performance degradation or damage caused by overheating.

[0003] Considering the complexity of seawater composition, and especially its corrosiveness, which negatively impacts the long-term safe and reliable operation of seawater pipelines within the hull, high-performance ships commonly employ staged cooling technology. This technology utilizes a centralized seawater heat exchanger for heat exchange between seawater and freshwater, which then cools the heat exchangers of the ship's heat source users. In this system, seawater only contacts the centralized seawater heat exchanger, shortening the seawater corrosion boundary and reducing the risk of system corrosion and leakage.

[0004] In addition, in order to reduce the power consumption of the sea-through pump source for transporting cooling water to the sea-through heat exchanger, a "bucket" set on the side of the ship is used to guide seawater into the seawater centralized heat exchanger by gravity, thereby improving the economic efficiency of the ship system operation.

[0005] On the other hand, in the aforementioned centralized self-flowing sea-cooling system, due to the highly concentrated cooling load outlet channels, blockage by contaminants will severely affect the normal cooling of heat-generating equipment. Therefore, the requirement for unobstructed channels is extremely high. Among these, marine organism attachment is a key factor affecting the normal operation of the centralized self-flowing sea-cooling system. During the operation of ships in seawater, various free microorganisms, plants, and animals are attracted to attach and grow on the functional surfaces of the sea-flowing heat exchanger. Over time, this eventually forms a marine organism attachment layer. Especially under the conditions of low seawater levels during low-speed navigation (or berthing) of the ship, marine organisms easily attach to the surface of the heat exchange tubes and grow at an extremely rapid rate, seriously affecting the normal operation of the heat exchanger.

[0006] To slow down the growth of marine organisms, various solutions have emerged, such as seawater electrolysis, chemical release, and antifouling coatings. However, these solutions generally suffer from low efficiency, high consumption, and poor sustainability, making it difficult to meet the requirements for efficient and reliable operation of centralized self-flowing sea cooling systems, especially the requirements for antifouling of sea cooling systems under long-term low-speed or moored conditions. Summary of the Invention

[0007] This invention provides an automatic antifouling device and vessel for a marine cooling system, which solves the problem in the prior art where marine organisms easily adhere to the surface of heat exchange tubes and grow at a very fast rate when the seawater is low during low-speed navigation (or berthing) of the ship, seriously affecting the normal operation of the heat exchanger. This invention enables timed automatic cleaning of the marine heat exchanger and improves the long-term operational reliability of the marine cooling system.

[0008] This invention provides an automatic antifouling device for a ship's sea-going cooling system, comprising:

[0009] A centralized seawater heat exchanger, wherein the outer wall of the heat exchange tubes of the centralized seawater heat exchanger is coated with a piezoelectric coating, and the centralized seawater heat exchanger is used to realize heat exchange between the ship's heat source and seawater.

[0010] An ultrasonic generator is provided, which is installed at the low-flow-rate section of the seawater centralized heat exchanger and is used to send ultrasonic waves to the seawater centralized heat exchanger.

[0011] A power supply, which is electrically connected to the ultrasonic generator;

[0012] A switch control component is connected between the power supply and the ultrasonic generator. The switch control component is used to control the on / off connection between the power supply and the ultrasonic generator according to the ship's speed or the flow rate of the seawater in the seawater centralized heat exchanger.

[0013] According to the present invention, an automatic antifouling device for a ship's sea-ventilated cooling system includes a switch control component comprising a nano-triboelectric generator, an electromagnetic device, and a normally closed switch. The normally closed switch is connected in series between the power supply and the ultrasonic generator. The normally closed switch, in conjunction with the electromagnetic device, controls the on / off state of the circuit between the power supply and the ultrasonic generator. The electromagnetic device is electrically connected to the nano-triboelectric generator. The nano-triboelectric generator generates electricity according to the scouring speed of seawater and supplies power to the electromagnetic device, thereby controlling the on / off state of the circuit between the power supply and the ultrasonic generator according to the ship's speed.

[0014] According to the present invention, an automatic antifouling device for a ship's sea-going cooling system is provided, wherein the nano-triboelectric generator is arranged at the seawater inlet of the seawater centralized heat exchanger and is in direct contact with the seawater inlet.

[0015] According to the present invention, an automatic antifouling device for a marine cooling system is provided, the automatic antifouling device for a marine cooling system further includes a time control switch, the time control switch being connected in series between the power supply and the ultrasonic generator, the time control switch being opened and closed according to a preset interval time.

[0016] According to the present invention, an automatic antifouling device for a ship's sea-ventilated cooling system is provided, wherein the relationship between the operating time DT1 and the interval time DT2 of the ultrasonic generator and the marine organism attachment cycle is as follows:

[0017] T1 < DT2 < T2 < DT1 < T3

[0018] Among them, 0-T1 is an organic film formed by organic molecules in seawater, which provides nutrients for marine organisms to attach to.

[0019] T1-T2 refers to the adhesion of bacteria and tiny plants and animals to the organic film, forming a microbial film;

[0020] T2-T3 represents the dormant bodies of prokaryotes, animal larvae, and algae that begin to grow on the surface of the microbial film, forming a biological community;

[0021] After T3, large fouling organisms grow rapidly.

[0022] According to the present invention, an automatic antifouling device for a marine cooling system is provided, wherein the ultrasonic generator is installed at the low-flow-rate section of the seawater centralized heat exchanger.

[0023] According to the present invention, an automatic antifouling device for a marine cooling system is provided, wherein the piezoelectric coating is doped with a high thermal conductivity material.

[0024] According to the present invention, an automatic antifouling device for a marine cooling system is provided, wherein the ultrasonic waves emitted by the ultrasonic generator include linear frequency-adjustable ultrasonic waves, stepped frequency-adjustable ultrasonic waves, and curved frequency-adjustable ultrasonic waves.

[0025] According to the present invention, an automatic antifouling device for a marine cooling system is provided, wherein the frequency of the ultrasonic generator is 18kHz-25kHz.

[0026] The present invention also provides a ship, including a hull and a sea-ventilated cooling system, wherein the sea-ventilated cooling system includes the automatic antifouling device for the ship's sea-ventilated cooling system described in any of the above claims.

[0027] The automatic antifouling device for a marine cooling system provided by this invention, by setting an ultrasonic generator corresponding to the seawater centralized heat exchanger, generates high-frequency ultrasonic waves in areas where marine organisms easily attach. These ultrasonic waves have a mechanical vibration effect, effectively removing marine organisms and contaminants attached to the surface of the heat exchange tubes. Furthermore, the ultrasonic generator can automatically control the generation of ultrasonic waves according to changes in seawater flow velocity. At low speeds or when moored, the ultrasonic generator automatically starts to perform cleaning; at high speeds, the ultrasonic generator automatically shuts off to avoid unnecessary energy consumption. Simultaneously, the piezoelectric coating sprayed on the outside of the heat exchange tubes generates pulsed electrical signals under the action of ultrasonic waves. These pulsed electrical signals can simulate the defense mechanisms of marine organisms, interfering with the attachment process and further enhancing the antifouling effect. Thus, through the synergistic effect of the mechanical vibration of the ultrasonic waves and the pulsed electrical signals of the piezoelectric coating, the system can effectively remove and prevent the attachment of marine organisms, reducing the accumulation of contaminants on the surface of the heat exchange tubes. This reduces the risk of heat exchanger performance degradation and system failure caused by marine organism attachment and contaminant blockage, significantly improving the reliability and economy of the marine cooling system in long-term operation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the centralized self-flowing offshore cooling system provided by the present invention.

[0030] Figure 2 This is a schematic diagram of the automatic anti-fouling device provided by the present invention.

[0031] Figure 3 This is a schematic diagram of the cross-section of the heat exchange tube with the piezoelectric coating provided by the present invention.

[0032] Figure 4 This is a schematic diagram of the attachment patterns of marine organisms provided by the present invention.

[0033] Figure 5 This is a schematic diagram of the opening and closing cycle of the time-controlled switch provided by the present invention.

[0034] Figure 6 This is a schematic diagram of the linear rising / falling ultrasonic spectrum provided by the present invention.

[0035] Figure 7 This is a schematic diagram of the stepped rise / fall ultrasonic spectrum provided by the present invention.

[0036] Figure 8This is a schematic diagram of the curved rising / falling ultrasonic spectrum provided by the present invention.

[0037] Figure label:

[0038] 10. Drainage bucket; 20. Seawater centralized heat exchanger; 201. Heat exchange tube; 201a. Piezoelectric coating; 201b. High thermal conductivity material; 30. Seawater discharge pipe; 40. Internal circulation cooling water inlet pipe; 50. Freshwater pump; 60. Heat source heat exchanger; 70. Internal circulation cooling water outlet pipe; 80. Nano-triboelectric generator; 90. Ultrasonic generator; 100. Power supply; 110. Time control switch; 120. Normally closed switch; 130. Electromagnetic device. Detailed Implementation

[0039] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0040] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0042] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] The following is combined Figures 1 to 8 The present invention provides a detailed description of an automatic antifouling device for a marine cooling system and a ship, through specific embodiments and application scenarios.

[0045] In embodiments of the present invention, such as Figure 2 As shown, the automatic antifouling device includes a seawater centralized heat exchanger 20, an ultrasonic generator 90, a power supply 100, and a switch control assembly. The outer wall of the heat exchange tubes 201 of the seawater centralized heat exchanger 20 is coated with a piezoelectric coating 201a. The seawater centralized heat exchanger 20 is used to realize heat exchange between the ship's heat source and seawater. The ultrasonic generator 90 is correspondingly arranged with the seawater centralized heat exchanger 20 and is used to send ultrasonic waves to the seawater centralized heat exchanger 20. The power supply 100 is electrically connected to the ultrasonic generator 90. The switch control assembly is connected between the power supply 100 and the ultrasonic generator 90 and is used to control the on / off state between the power supply 100 and the ultrasonic generator 90 according to the ship's speed or the flow rate of the seawater in the seawater centralized heat exchanger 20.

[0046] This application, by setting an ultrasonic generator 90 corresponding to the seawater centralized heat exchanger 20, can generate high-frequency ultrasonic waves in areas where marine organisms easily attach. These ultrasonic waves have a mechanical vibration effect, which can effectively remove marine organisms and dirt attached to the surface of the heat exchange tube 201. Furthermore, the ultrasonic generator 90 can automatically control the generation of ultrasonic waves according to changes in seawater flow velocity. Under low-speed or moored conditions, the ultrasonic generator 90 automatically starts to perform cleaning; at high speeds, the ultrasonic generator 90 automatically shuts down to avoid unnecessary energy consumption. Simultaneously, the piezoelectric coating 201a sprayed on the outside of the heat exchange tube 201 generates pulsed electrical signals under the action of ultrasonic waves. These pulsed electrical signals can simulate the defense mechanisms of marine organisms, interfering with the attachment process of marine organisms and further enhancing the antifouling effect. Thus, through the synergistic effect of the mechanical vibration of ultrasound and the pulsed electrical signal of the piezoelectric coating 201a, the system can effectively remove and prevent marine organisms from attaching, reduce the accumulation of dirt on the surface of the heat exchange tube 201, thereby reducing the risk of heat exchanger performance degradation and system failure caused by marine organism attachment and dirt blockage, and significantly improving the reliability and economy of the sea cooling system in long-term operation.

[0047] The main function of the seawater centralized heat exchanger 20 is to realize heat exchange between the seawater cooling subsystem and the internal circulating cooling water subsystem.

[0048] The nano-triboelectric generator 80 is installed at a location sensitive to seawater flow velocity (preferably at the inlet of the centralized seawater heat exchanger 20). It can sensitively detect changes in seawater flow velocity and generate electricity based on the seawater scouring speed. When the ship is traveling at high speed, the seawater flow velocity is high, and the nano-triboelectric generator 80 generates sufficient electrical energy; while at low speeds or when the ship is moored, the seawater flow velocity is low, and the electrical energy generated by the nano-triboelectric generator 80 decreases. The electrical energy generated by the nano-triboelectric generator 80 is directly supplied to the electromagnetic device 130 as a control signal source. In this way, the nano-triboelectric generator 80 can automatically control the operating state of the ultrasonic generator 90 according to the ship's speed. The nano-triboelectric generator 80 only activates the ultrasonic generator 90 when needed (at low speeds or when moored), avoiding unnecessary energy consumption and improving the system's economy.

[0049] Electromagnetic device 130 and normally closed switch 120 are connected in series between power supply 100 and ultrasonic generator 90 to control the circuit's on / off state. When the nano-triboelectric generator 80 generates sufficient electrical energy, electromagnetic device 130 is energized, attracting the ferromagnetic lever of normally closed switch 120, thus disconnecting the circuit. When the nano-triboelectric generator 80 cannot generate sufficient electrical energy, electromagnetic device 130 is de-energized, normally closed switch 120 closes, and the circuit is connected. Electromagnetic device 130 automatically controls the start and stop of ultrasonic generator 90 based on the electrical energy output of nano-triboelectric generator 80, realizing an automatic anti-fouling function based on ship speed.

[0050] Normally closed switch 120 is connected in series with electromagnetic device 130 to control the circuit connection between power supply 100 and ultrasonic generator 90. Under normal circumstances, normally closed switch 120 is closed to ensure circuit continuity. The ferromagnetic tab of normally closed switch 120 operates under the control of electromagnetic device 130 to automatically open and close the circuit. When electromagnetic device 130 is energized, normally closed switch 120 is open; when electromagnetic device 130 is de-energized, normally closed switch 120 is closed.

[0051] Thus, the nano-triboelectric generator 80 generates electrical energy according to changes in seawater flow velocity, and the electromagnetic device 130 controls the opening and closing of the normally closed switch 120 based on the presence or absence of electrical energy, thereby realizing the automatic start and stop of the ultrasonic generator 90. Under low-speed or moored conditions, the ultrasonic generator 90 automatically starts to perform cleaning; at high speeds, the ultrasonic generator 90 automatically shuts down to avoid unnecessary energy consumption.

[0052] Reference Figure 2 According to the present invention, an automatic antifouling device for a marine cooling system is provided. The automatic antifouling device for a marine cooling system further includes a time control switch 110, which is connected in series between a power supply 100 and an ultrasonic generator 90. The time control switch 110 is opened and closed according to a preset interval.

[0053] Understandably, the timer switch 110 contains an internal timer that can be set to activate and deactivate at specific intervals. When the preset activation time is reached, the timer switch 110 closes the circuit, connecting the power supply and causing the ultrasonic generator 90 to start operating. When the preset deactivation time is reached, the timer switch 110 disconnects the circuit, cutting off the power supply and causing the ultrasonic generator 90 to stop operating. According to marine biological research, the attachment and growth of marine organisms follow certain cyclical patterns. The timer switch 110 can be set with appropriate activation frequencies and durations based on these patterns to effectively prevent the attachment and reproduction of marine organisms during critical time periods.

[0054] When the ship is sailing at low speed or even anchored, the seawater flow rate and velocity entering the seawater channel of the centralized seawater heat exchanger 20 are low. Therefore, marine organisms may gradually attach and grow. At this time, because the nano-triboelectric generator 80 is under the condition of low-velocity seawater scouring, it cannot generate continuous electrical energy to excite the electromagnetic device 130 to form electromagnetic force. The ferromagnetic lever of the normally closed switch 120 closes to form a connected circuit, which enables the supply of power to the ultrasonic generator 90. With the timed opening and closing of the timer switch 110, the power supply 100 continuously supplies power to the ultrasonic generator 90 at intervals of DT2, and the power supply duration is DT1. Within the DT1 time range, the ultrasonic generator 90 emits linear, stepwise, or curved frequency-increasing (or decreasing) ultrasonic waves in the high-frequency range of 18kHz-25kHz under programmable regulation. This frequency band covers the anaerobic range of different marine organism populations, making it difficult for various large marine organisms, biological communities, and their attached condition modes and microbial films to form. This completely blocks the conditions for marine organism attachment and growth, ensuring that the seawater centralized heat exchanger 20 will not be blocked by marine organisms under long-term low-speed navigation or anchoring conditions.

[0055] Reference Figures 4 to 8 According to the automatic antifouling device for a ship's sea-cooling system provided by the present invention, the relationship between the operating time DT1 and the interval time DT2 of the ultrasonic generator 90 and the marine organism attachment cycle is as follows: T1 < DT2 < T2 < DT1 < T3, where 0-T1 is the period when organic molecules in seawater form an organic film, providing nutrients for marine organism attachment; T1-T2 is the period when bacteria and microorganisms adhere to the organic film, forming a microbial film; T2-T3 is the period when dormant prokaryotes, animal larvae and algae begin to grow on the surface of the microbial film, forming a biological community; and after T3, large fouling organisms grow rapidly.

[0056] Understandably, the closing and opening times DT1 and DT2 of the time-controlled switch 110 are set according to the attachment conditioned modulus of marine organisms and biofilm formation cycles. Specifically: According to the attachment patterns of marine organisms: During the period from 0 to T1, organic molecules in seawater, such as free proteins, polysaccharides, and metabolic products of biological cells, form an organic film of a certain thickness, providing the necessary nutrients for the attachment and survival of marine organisms; During the period from T1 to T2, bacteria and microorganisms adhere to the conditioned modulus under external environmental conditions through electrostatic forces, van der Waals forces, etc., forming a biofilm; Since these periods are relatively short, the formed conditioned modulus or biofilm is easily removed by ultrasound. Therefore, the ultrasonic operation interval DT2 of the antifouling system needs to be greater than T1 to meet energy-saving requirements, while being less than T2 to achieve efficient cleaning; During the period from T2 to T3, resistant dormant forms of prokaryotes, animal larvae, and algae begin to grow on the surface of the biofilm, forming a biological community; After T3, large fouling organisms grow rapidly, at which point ultrasound becomes difficult to remove them. Therefore, in order to achieve broad-spectrum and efficient removal of conditional membranes, biofilms and biological communities, and to avoid the growth of large fouling organisms, the ultrasonic running time DT1 of the antifouling system should be greater than T2, and in order to reduce power consumption, the running time DT1 needs to be controlled within T3.

[0057] In summary, the relationship between the running time DT1 and the interval time DT2 of the ultrasonic generator 90 and the marine organism attachment cycle is: T1 < DT2 < T2 < DT1 < T3.

[0058] Reference Figure 1 According to the present invention, an automatic antifouling device for a ship's sea-crossing cooling system is provided, wherein a nano-friction generator 80 is arranged at the seawater inlet of the seawater centralized heat exchanger 20 and is in direct contact with the flowing seawater at the seawater inlet.

[0059] Understandably, since the nano-triboelectric generator 80 is in direct contact with flowing seawater, the seawater can directly act on the blades or other load-bearing structures of the nano-triboelectric generator 80 as it flows through the channel. This arrangement maximizes the utilization of the flowing kinetic energy of the seawater, enabling the nano-triboelectric generator 80 to more effectively capture the scouring energy of the seawater, thereby improving power generation efficiency.

[0060] Reference Figure 1 According to the present invention, an automatic antifouling device for a ship's sea-cooling system is provided, wherein an ultrasonic generator 90 is correspondingly arranged with the seawater centralized heat exchanger 20, and the ultrasonic generator 90 is arranged in a low-flow-velocity part of the seawater centralized heat exchanger 20 (e.g., behind the baffle).

[0061] Understandably, since the low-velocity zone of the seawater central heat exchanger 20 (e.g., behind the baffle) is where marine organisms are most likely to attach, and is also a blind spot for ultrasonic cleaning, placing the ultrasonic generator 90 in the low-velocity zone of the seawater central heat exchanger 20 can more effectively remove the main attachment sites of marine organisms, and the reflection of ultrasonic waves by multiple baffles can make the ultrasonic antifouling effect more uniform in the complex flow channel.

[0062] Reference Figure 3 According to the present invention, an automatic antifouling device for a marine cooling system is provided, wherein a piezoelectric coating 201a is doped with a high thermal conductivity material 201b.

[0063] It is understandable that the piezoelectric coating 201a usually has poor thermal conductivity. In order to avoid the impact of coating the heat exchange tube 201 with the piezoelectric coating 201a on the heat exchange performance, a high thermal conductivity material 201b (such as graphene or carbon nanotubes) is doped into the piezoelectric coating 201a to reduce the thermal resistance of the coating and improve the heat exchange performance while ensuring the ability to prevent marine organisms.

[0064] The present invention also provides a ship, including a hull and a sea-ventilated cooling system, wherein the sea-ventilated cooling system includes the automatic anti-fouling device for the ship's sea-ventilated cooling system as described above.

[0065] The seawater cooling system includes a seawater cooling subsystem and an internal circulation cooling water subsystem. The seawater centralized heat exchanger 20 has a seawater channel and an internal circulation cooling medium channel. The seawater channel is connected to the seawater cooling subsystem, and the internal circulation cooling medium channel is connected to the internal circulation cooling water subsystem. The seawater centralized heat exchanger 20 is used to exchange heat between the seawater cooling subsystem and the internal circulation cooling water subsystem. The main function of the seawater centralized heat exchanger 20 is to realize the heat exchange between the seawater cooling subsystem and the internal circulation cooling water subsystem.

[0066] The seawater cooling subsystem is used to introduce seawater as a cooling medium. Seawater can enter the system through the diversion bucket 10 or other means, passing through the seawater channels of the centralized seawater heat exchanger 20, carrying away heat from the heat exchanger, thereby cooling the internal circulating cooling medium. The seawater cooling subsystem provides the necessary cooling capacity for the entire cooling cycle, ensuring that the system can effectively reduce the temperature of the ship's heat source.

[0067] The internal circulation cooling water subsystem circulates an internal circulation cooling medium (usually fresh water), whose main function is to exchange heat with the ship's heat sources. The subsystem uses a pump to drive the cooling medium to circulate within the system, transferring heat generated by the ship's heat sources (such as generator sets, electromechanical equipment, etc.) to the seawater centralized heat exchanger 20. The internal circulation cooling medium exchanges heat with seawater in the seawater centralized heat exchanger 20, thereby removing heat and ensuring that the heat source equipment operates within its normal temperature range.

[0068] Reference Figure 1 According to the present invention, an automatic antifouling device for a ship's seawater cooling system includes a seawater cooling subsystem comprising a diversion bucket 10 and a seawater discharge pipe 30. The diversion bucket 10 is connected to the inlet of the seawater channel, and the seawater discharge pipe 30 is connected to the outlet of the seawater channel.

[0069] Understandably, the diversion bucket 10 is mounted on the side of the ship, and its main function is to efficiently introduce seawater into the seawater channel. This design utilizes the hydrodynamic force of the ship's navigation, using the "bucket" structure to allow seawater to flow into the system by gravity, reducing reliance on additional pumping equipment.

[0070] The seawater discharge pipe 30 is connected to the outlet of the seawater channel, and its main function is to discharge the seawater after heat exchange out of the system. By rationally designing the discharge pipe, it is ensured that seawater can be discharged smoothly and avoids accumulation in the system, thereby maintaining the normal operation of the system.

[0071] Reference Figure 1 According to the present invention, an automatic antifouling device for a marine cooling system includes an internal circulation cooling water subsystem comprising an internal circulation cooling water inlet pipe 40, a freshwater pump 50, a heat source heat exchanger 60, and an internal circulation cooling water outlet pipe 70. The internal circulation cooling water inlet pipe 40 is connected to the outlet of the internal circulation cooling medium channel, and the internal circulation cooling water outlet pipe 70 is connected to the inlet of the internal circulation cooling medium channel. The heat source heat exchanger 60 is connected to both the internal circulation cooling water inlet pipe 40 and the internal circulation cooling water outlet pipe 70. The freshwater pump 50 is connected to the internal circulation cooling water inlet pipe 40. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic antifouling device for a ship's sea-ventilated cooling system, characterized in that, include: A centralized seawater heat exchanger, wherein the outer wall of the heat exchange tubes of the centralized seawater heat exchanger is coated with a piezoelectric coating, and the centralized seawater heat exchanger is used to realize heat exchange between the ship's heat source and seawater. An ultrasonic generator is provided, which is installed at the low-flow-rate section of the seawater centralized heat exchanger and is used to send ultrasonic waves to the seawater centralized heat exchanger. A power supply, which is electrically connected to the ultrasonic generator; A switch control assembly is connected between the power supply and the ultrasonic generator. The switch control assembly is used to control the on / off connection between the power supply and the ultrasonic generator according to the ship's speed or the flow rate of the seawater in the seawater central heat exchanger. The switch control assembly includes a nano-triboelectric generator, an electromagnetic device, and a normally closed switch. The normally closed switch is connected in series between the power supply and the ultrasonic generator. The normally closed switch, in conjunction with the electromagnetic device, controls the on / off state of the circuit between the power supply and the ultrasonic generator. The electromagnetic device is electrically connected to the nano-triboelectric generator. The nano-triboelectric generator generates electricity according to the scouring speed of seawater and supplies power to the electromagnetic device, thereby realizing the control of the on / off state of the circuit between the power supply and the ultrasonic generator according to the ship's speed. The automatic antifouling device of the ship's sea-crossing cooling system also includes a time control switch, which is connected in series between the power supply and the ultrasonic generator. The time control switch opens and closes according to a preset interval.

2. The automatic antifouling device for a ship's sea-crossing cooling system according to claim 1, characterized in that, The nano-triboelectric generator is located at the seawater inlet of the seawater central heat exchanger and is in direct contact with the seawater at the seawater inlet.

3. The automatic antifouling device for a ship's sea-crossing cooling system according to claim 1, characterized in that, The relationship between the ultrasonic generator's operating time DT1 and its interval DT2 and the marine organism attachment cycle is as follows: T1 < DT2 < T2 < DT1 < T3 Among them, 0-T1 is an organic film formed by organic molecules in seawater, which provides nutrients for marine organisms to attach to. T1-T2 refers to the adhesion of bacteria and tiny plants and animals to the organic film, forming a microbial film; T2-T3 represents the dormant bodies of prokaryotes, animal larvae, and algae that begin to grow on the surface of the microbial film, forming a biological community; After T3, large fouling organisms grow rapidly.

4. The automatic antifouling device for a ship's sea-ventilated cooling system according to any one of claims 1 to 3, characterized in that, The ultrasonic generator is installed at the low-velocity section of the seawater centralized heat exchanger.

5. The automatic antifouling device for a ship's sea-crossing cooling system according to any one of claims 1 to 3, characterized in that, The piezoelectric coating is doped with a material with high thermal conductivity.

6. The automatic antifouling device for a ship's sea-ventilated cooling system according to any one of claims 1 to 3, characterized in that, The ultrasonic waves emitted by the ultrasonic generator include linear frequency-increasing ultrasonic waves, stepped frequency-increasing ultrasonic waves, and curved frequency-increasing ultrasonic waves.

7. The automatic antifouling device for a ship's sea-crossing cooling system according to claim 6, characterized in that, The frequency of the ultrasonic generator is 18kHz-25kHz.

8. A ship, characterized in that, It includes a ship's side and a sea-ventilated cooling system, wherein the sea-ventilated cooling system includes an automatic antifouling device for a ship's sea-ventilated cooling system as described in any one of claims 1 to 6.

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