Cooling and flushing device and method for fresh water heat exchanger of marine main engine

Abstract

The invention relates to the technical field of ship cooling systems, in particular to a ship main engine fresh water heat exchanger cooling and flushing device which comprises a seawater supply pipe, a seawater pump, a main engine fresh water heat exchanger, a forward and reverse water inlet pipe, a forward and reverse water outlet pipe and a pressure pulse generator. The seawater supply pipe conveys seawater in the forward direction and the reverse direction for alternate flushing, the pressure pulse generator conducts pressure pulse flushing, and the ultrasonic generator emits ultrasonic waves for cleaning. Dirt and impurities attached to the heat exchange surface in the main engine fresh water heat exchanger are comprehensively and efficiently removed, the heat exchange effect of the main engine fresh water heat exchanger is guaranteed, the service life of the main engine fresh water heat exchanger is long, the amount of seawater leaking into an engine room is reduced, normal operation of a ship main engine is guaranteed, and navigation safety and economical efficiency of a ship are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship cooling systems, and in particular to a cooling and flushing device and method for a freshwater heat exchanger of a ship main engine. Background Art

[0002] During the operation of a ship, the main engine freshwater heat exchanger plays a vital role. It transfers the heat generated by the main engine to fresh water, which is then cooled by seawater, thereby ensuring the normal operating temperature of the main engine. However, since seawater contains a large amount of impurities, microorganisms, and salt, the heat exchange surface inside the heat exchanger is easily covered with dirt, biological attachment, and corrosion products during long-term use, resulting in a decrease in heat exchange efficiency, which in turn causes the main engine temperature to be too high, affecting the safe and stable operation of the ship. Conventional dredging is to open the end covers on both sides of the heat exchanger and dredge it with a needle. However, dredging is extremely inconvenient, easily affecting production operations, the surrounding area is easily dirty, and a large amount of seawater leaks into the engine room. Summary of the Invention

[0003] The purpose of the present invention is to provide a cooling and flushing device and method for a freshwater heat exchanger of a ship's main engine, which aims to effectively remove dirt, biological attachment and corrosion products covering the heat exchange surface inside the main engine freshwater heat exchanger, improve the heat exchange efficiency of the main engine freshwater heat exchanger, and ensure the normal operation of the ship's main engine.

[0004] To achieve the above-mentioned object, the present invention provides a cooling and flushing device for a freshwater heat exchanger of a ship main engine, comprising: a seawater supply pipe, the seawater supply pipe inputting external seawater, the seawater supply pipe being provided with a first valve body; A seawater pump is provided on the seawater supply pipe to provide seawater delivery pressure; The main engine fresh water heat exchanger has an inlet and an outlet, and an ultrasonic generator is installed inside the main engine fresh water heat exchanger; a forward water inlet pipe, wherein a first end of the forward water inlet pipe is connected to the second end of the seawater supply pipe, and a second end of the forward water inlet pipe is connected to the inlet; a forward water outlet pipe, wherein a first end of the forward water outlet pipe is connected to the outlet, and a second end of the forward water outlet pipe is connected to external seawater; a reverse water inlet pipe, wherein a first end of the reverse water inlet pipe is connected to the second end of the seawater supply pipe, and a second end of the reverse water inlet pipe is connected to the forward water outlet pipe; a reverse water outlet pipe, wherein a first end of the reverse water outlet pipe is connected to the forward water inlet pipe, and a second end of the reverse water outlet pipe is connected to external seawater; There are two second valve bodies, one of which is provided on the forward water inlet pipe and located at the front end of the first end of the reverse water outlet pipe, and the other is provided on the forward water outlet pipe and located between the rear end of the second end of the reverse water inlet pipe and the front end of the second end of the reverse water outlet pipe; There are two third valve bodies, one of which is provided on the reverse water inlet pipe and the other is provided on the reverse water outlet pipe; There are two pressure pulse generators, one of which is arranged in the forward water inlet pipe and the other is arranged in the reverse water inlet pipe; and A controller is electrically connected to the first valve body, the second valve body, the third valve body, the seawater pump, the pressure pulse generator and the ultrasonic generator.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows: As a further improvement of the above technical solution, there are two seawater pumps, one for use and one for backup, which are arranged in parallel on the seawater supply pipe.

[0006] As a further improvement of the above technical solution, the ship main engine fresh water heat exchanger cooling and flushing device also includes a fourth valve body and a fifth valve body. The fourth valve body is arranged on the seawater supply pipe and located at the front end of each seawater pump; the fifth valve body is a stop check valve, which is arranged on the seawater supply pipe and located at the rear end of each seawater pump.

[0007] As a further improvement of the above technical solution, the ship main engine fresh water heat exchanger cooling and flushing device also includes a sixth valve body, which is a stop check valve and is arranged at the second end of the forward water outlet pipe.

[0008] As a further improvement of the above technical solution, temperature sensors are installed at the inlet and outlet of the main fresh water heat exchanger, and flow meters are installed on the forward water inlet pipe, forward water outlet pipe, reverse water inlet pipe and reverse water outlet pipe. The temperature sensor and flow meter are electrically connected to the controller.

[0009] The present invention also provides a method for using the above-mentioned ship main engine freshwater heat exchanger cooling and flushing device, which is automatically operated by a controller and includes the following steps: Step S1, forward cooling and flushing with seawater: Open the first and second valve bodies, close the third valve body, and activate the pressure pulse generator on the forward water inlet pipe. The seawater supply pipe inputs external seawater, which passes through the forward water inlet pipe and enters the inlet of the main engine fresh water heat exchanger. It exchanges heat in the main engine fresh water heat exchanger and flushes the heat exchange surface. Then, it enters the forward water outlet pipe from the outlet of the main engine fresh water heat exchanger and is discharged from the ship. Step S2, seawater reverse flushing: Close the second valve body, open the third valve body, and activate the pressure pulse generator on the reverse water inlet pipe. Seawater passes through the reverse water inlet pipe and enters from the outlet of the main engine fresh water heat exchanger, flushes the heat exchange surface in the main engine fresh water heat exchanger, and then enters the reverse water outlet pipe from the inlet of the main engine fresh water heat exchanger and is discharged from the ship; In step S1 and step S2, while the seawater pump pumps seawater, the ultrasonic generator in the main engine freshwater heat exchanger emits ultrasonic pulses.

[0010] As a further improvement of the above technical solution, the temperature sensor sends the detected temperature signal to the controller, and the flow meter sends the detected flow signal to the controller. The controller automatically adjusts the opening of each valve body according to the temperature data and flow data to adjust the seawater flow.

[0011] The beneficial effects of the present invention are as follows: the ship main engine freshwater heat exchanger cooling and flushing device of the present invention achieves relatively comprehensive and efficient cleaning of the main engine freshwater heat exchanger by adopting seawater forward and reverse flushing, pressure pulse flushing by a pressure pulse generator and ultrasonic cleaning by an ultrasonic generator, which can effectively solve the problem of reduced heat exchange efficiency of the main engine freshwater heat exchanger due to the adhesion of dirt and impurities, and can reduce the amount of seawater leaking into the engine room without affecting the safe production of the ship by utilizing the gaps between ship operations, making the engine room cleaner and more beautiful, ensuring the normal operation of the ship main engine, and improving the navigation safety and economy of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and examples.

[0013] Figure 1 This is a structural diagram of a cooling and flushing device for a freshwater heat exchanger of a ship main engine provided by a preferred embodiment of the present invention; Figure 2 This is a connection diagram of the controller in the cooling and flushing device of the fresh water heat exchanger of the main engine of the ship provided by the preferred embodiment of the present invention; In the figure: 1. Main engine fresh water heat exchanger; 11. Inlet; 12. Outlet; 2. Seawater supply pipe; 21. First valve body; 31. Forward water inlet pipe; 32. Forward water outlet pipe; 33. Second valve body; 34. Sixth valve body; 41. Reverse water inlet pipe; 42. Reverse water outlet pipe; 43. Third valve body; 5. Seawater pump; 51. Fourth valve body; 52. Fifth valve body; 6. Controller; 7. Pressure pulse generator; 8. Ultrasonic generator; 9. Temperature sensor; 10. Flow meter. DETAILED DESCRIPTION

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0016] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0017] In the present invention, the first end is an end close to the water inlet direction of the seawater supply pipe 2, and the second end is an end close to the water outlet direction of the forward water outlet pipe 32.

[0018] First embodiment: like Figure 1 、 Figure 2 As shown, a first embodiment of the present invention provides a cooling and flushing device for a freshwater heat exchanger of a ship main engine, comprising: A seawater supply pipe 2, which inputs external seawater and is provided with a first valve body 21; A seawater pump 5 is provided on the seawater supply pipe 2 to provide seawater delivery pressure; The main engine fresh water heat exchanger 1 has an inlet 11 and an outlet 12, and an ultrasonic generator 8 is installed inside the main engine fresh water heat exchanger 1; a forward water inlet pipe 31, wherein a first end of the forward water inlet pipe 31 is connected to the second end of the seawater supply pipe 2, and a second end of the forward water inlet pipe 31 is connected to the inlet 11; a forward water outlet pipe 32 , wherein a first end of the forward water outlet pipe 32 is connected to the outlet 12 , and a second end of the forward water outlet pipe 32 is connected to external seawater; A reverse water inlet pipe 41, wherein a first end of the reverse water inlet pipe 41 is connected to the second end of the seawater supply pipe 2, and a second end of the reverse water inlet pipe 41 is connected to the forward water outlet pipe 32; A reverse water outlet pipe 42, wherein a first end of the reverse water outlet pipe 42 is connected to the forward water inlet pipe 31, and a second end of the reverse water outlet pipe 42 is connected to external seawater; There are two second valve bodies 33, one of which is provided on the forward water inlet pipe 31 and is located at the front end of the first end of the reverse water outlet pipe 42, and the other is provided on the forward water outlet pipe 32 and is located between the rear end of the second end of the reverse water inlet pipe 41 and the front end of the second end of the reverse water outlet pipe 42; There are two third valve bodies 43, one of which is provided on the reverse water inlet pipe 41 and the other is provided on the reverse water outlet pipe 42; There are two pressure pulse generators 7, one of which is provided in the forward water inlet pipe 31 and the other is provided in the reverse water inlet pipe 41; and The controller 6 is electrically connected to the first valve body 21 , the second valve body 33 , the third valve body 43 , the seawater pump 5 , the pressure pulse generator 7 and the ultrasonic generator 8 .

[0019] The seawater supply pipe 2 is used to input external seawater, and the first end of the seawater supply pipe 2 is connected to the external, relatively cool seawater. In this embodiment, the seawater supply pipe 2 is provided to transport external seawater. By opening the first valve body 21 to allow the external seawater to enter the main engine freshwater heat exchanger 1 for heat exchange, the equipment is cooled, and the heat-exchanged seawater is discharged from the hull.

[0020] like Figure 1 As shown, further, the ship main engine fresh water heat exchanger cooling and flushing device also includes a sixth valve body 34, which is a stop check valve and is arranged at the second end of the forward outlet pipe 32 to prevent seawater after external heat exchange from flowing back into the forward outlet pipe 32 and the reverse outlet pipe 42. The sixth valve body 34 is normally open in all working conditions.

[0021] Preferably, there are two seawater pumps 5, one for use and one for backup, installed in parallel on the seawater supply pipe 2. The ship's main engine freshwater heat exchanger cooling and flushing device also includes a fourth valve body 51 and a fifth valve body 52. The fourth valve body 51 is a manual gate valve installed on the seawater supply pipe 2 and located at the front end of each seawater pump 5; the fifth valve body 52 is a manual stop check valve installed on the seawater supply pipe 2 and located at the rear end of each seawater pump 5. When one seawater pump 5 requires maintenance, the fourth valve body 51 and the fifth valve body 52 on either side of it are manually closed, and the fourth valve body 51 and the fifth valve body 52 on either side of the other seawater pump 5 are opened to ensure normal seawater transportation.

[0022] The seawater pump 5 should be a corrosion-resistant centrifugal pump with high head and large flow. The head should be accurately calculated according to the resistance and pipeline loss of the main engine fresh water heat exchanger 1 to ensure that the reverse water flow has sufficient impact force to effectively flush the heat exchange surface of the main engine fresh water heat exchanger 1. The flow rate should meet the requirements of completing the backwash operation in a short time. The ship's own fire pump or main pump can be selected as the seawater pump.

[0023] In this embodiment, by providing a reverse water inlet pipe 41 and a reverse water outlet pipe 42, closing the second valve body 33 and opening the third valve body 43, seawater can reversely enter the main engine fresh water heat exchanger 1 for heat exchange, while flushing away the dirt, biological attachment and corrosion products covering the heat exchange surface inside the main engine fresh water heat exchanger 1 and discharging them to the outside of the ship. Forward and reverse flushing are performed alternately, and the flushing effect is better, further ensuring the heat exchange effect and service life of the main engine fresh water heat exchanger 1.

[0024] The pressure pulse generator 7 is a device that can generate periodic or non-periodic pressure pulses, generating intermittent high-pressure pulse water flow. The high-pressure pulse water flow can more effectively flush the dirt, biological attachment and corrosion products covering the heat exchange surface inside the host fresh water heat exchanger 1, thereby improving the flushing effect.

[0025] By installing an ultrasonic generator 8 inside the main fresh water heat exchanger 1 and emitting ultrasonic pulses, the ultrasonic waves can generate alternating positive and negative pressures, so that the dirt, biological attachments and corrosion products covering the heat exchange surface inside the main fresh water heat exchanger 1 are dispersed and removed, thereby improving the cleaning effect.

[0026] Preferably, temperature sensors 9 are installed at the inlet 11 and outlet 12 of the main freshwater heat exchanger 1, and flow meters 10 are installed on the forward water inlet pipe 31, the forward water outlet pipe 32, the reverse water inlet pipe 41 and the reverse water outlet pipe 42. The temperature sensor 9 and the flow meter 10 are electrically connected to the controller 6. The temperature sensor 9 is used to monitor the seawater temperature in real time, and the flow meter 10 is used to monitor the seawater flow in real time; the temperature sensor 9 sends the detected temperature signal to the controller 6, and the flow meter 10 sends the detected flow signal to the controller 6. The controller 6 automatically adjusts the opening of each valve body according to the temperature data and the flow data to adjust the seawater flow, thereby ensuring that the main freshwater heat exchanger 1 operates within the optimal temperature range and improving the heat exchange efficiency and flushing effect.

[0027] Further preferably, the controller 6 has a built-in intelligent algorithm that can automatically adjust the cleaning strategy based on monitoring data such as temperature and flow rate; for example, when a decrease in heat exchange efficiency is detected, the backwash program is automatically started, and the frequency of pressure pulse flushing by the pressure pulse generator 7 and ultrasonic cleaning by the ultrasonic generator 8 is increased, thereby realizing intelligent cleaning of the main fresh water heat exchanger 1.

[0028] In this application, electrical connection refers to the connection between different components in a circuit through physical lines such as PCB copper foil or wires that can transmit electrical signals. The controller 6 can be a commercially available PLC controller 6, and the control program is the existing technology.

[0029] The cooling and flushing device for the freshwater heat exchanger of a ship main engine of the present invention comprises a seawater supply pipe 2, a seawater pump 5, a main engine freshwater heat exchanger 1, a forward water inlet pipe 31, a forward water outlet pipe 32, a reverse water inlet pipe 41, a reverse water outlet pipe 42, a second valve body 33, a third valve body 43 and a pressure pulse generator 7. When the ship is operating, the seawater pump 5 pumps seawater, and the seawater supply pipe 2 is opened in the forward and reverse directions by opening the first valve body 21 and the second valve body 33 and closing the third valve body 43, and by opening the third valve body 43 and closing the second valve body 33. The seawater is transported alternately for flushing, the pressure pulse generator 7 performs pressure pulse flushing, and the ultrasonic generator 8 emits ultrasonic waves for cleaning. While cooling the main fresh water heat exchanger 1, the dirt, biological attachment and corrosion products covering the heat exchange surface inside the main fresh water heat exchanger 1 are removed more comprehensively and efficiently, reducing the accumulation and attachment of dirt, biological attachment and corrosion products on the heat exchange surface inside the main fresh water heat exchanger 1, ensuring the heat exchange effect of the main fresh water heat exchanger 1 and extending the service life of the main fresh water heat exchanger 1.

[0030] Second embodiment: This embodiment discloses a method for applying the aforementioned cooling and flushing device for the freshwater heat exchanger of a ship main engine, which is automatically operated by the controller 6 and includes the following steps: Step S1, forward cooling and flushing with seawater: Open the first valve body 21 and the second valve body 33, close the third valve body 43, and activate the pressure pulse generator 7 on the forward water inlet pipe 31. The seawater supply pipe 2 inputs external seawater. The seawater passes through the forward water inlet pipe 31 and enters the inlet 11 of the main engine fresh water heat exchanger 1. The seawater exchanges heat in the main engine fresh water heat exchanger 1 and flushes the heat exchange surface. The seawater then enters the forward water outlet pipe 32 through the outlet 12 of the main engine fresh water heat exchanger 1 and is discharged from the ship. Step S2, seawater backwashing: Close the second valve body 33, open the third valve body 43, and activate the pressure pulse generator 7 on the reverse water inlet pipe 41. Seawater passes through the reverse water inlet pipe 41 and enters the outlet 12 of the main engine fresh water heat exchanger 1, flushes the heat exchange surface in the main engine fresh water heat exchanger 1, and then enters the reverse water outlet pipe 42 through the inlet 11 of the main engine fresh water heat exchanger 1 and is discharged from the ship. In step S1 and step S2 , while the seawater pump 5 pumps seawater, the ultrasonic generator 8 in the main engine freshwater heat exchanger 1 emits ultrasonic pulses.

[0031] Working principle of back flushing: Back flushing mainly uses reverse water flow to flush the heat exchange surface inside the main engine fresh water heat exchanger 1 to remove attached dirt and impurities. Under normal working conditions, seawater flows in from the inlet 11 of the main engine fresh water heat exchanger 1, passes through the heat exchange surface and flows out from the outlet 12, thereby cooling the fresh water in the main engine fresh water heat exchanger 1. When the back flushing program is started, the valve is switched to allow seawater to flow in reverse from the outlet 12 of the main engine fresh water heat exchanger 1. The strong reverse water flow impacts the heat exchange surface, washes off the attached dirt and impurities, and discharges them through the ship's sewage outlet. This back flushing method can effectively remove dirt, biological attachment and corrosion products covering the heat exchange surface inside the main engine fresh water heat exchanger 1, and restore its heat exchange performance.

[0032] According to the method of the present invention, when the ship is operating, seawater is transported alternately in forward and reverse directions, and at the same time, a pressure pulse generator 7 is started to perform pressure pulse flushing, and an ultrasonic generator 8 emits ultrasonic waves for cleaning, thereby achieving a relatively comprehensive and efficient removal of dirt, biological attachments and corrosion products covering the heat exchange surface inside the freshwater heat exchanger 1 of the ship's main engine. The method is automatically operated by a controller 6, and has a high degree of automation.

[0033] Any matters not mentioned in the above specific embodiments of the present invention belong to the common knowledge in this field and can be implemented with reference to the common knowledge.

[0034] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A cooling and flushing device for a freshwater heat exchanger of a ship main engine, characterized by: include: a seawater supply pipe, the seawater supply pipe inputting external seawater, the seawater supply pipe being provided with a first valve body; A seawater pump is provided on the seawater supply pipe to provide seawater delivery pressure; The main engine fresh water heat exchanger has an inlet and an outlet, and an ultrasonic generator is installed inside the main engine fresh water heat exchanger; a forward water inlet pipe, wherein a first end of the forward water inlet pipe is connected to the second end of the seawater supply pipe, and a second end of the forward water inlet pipe is connected to the inlet; a forward water outlet pipe, wherein a first end of the forward water outlet pipe is connected to the outlet, and a second end of the forward water outlet pipe is connected to external seawater; a reverse water inlet pipe, wherein a first end of the reverse water inlet pipe is connected to the second end of the seawater supply pipe, and a second end of the reverse water inlet pipe is connected to the forward water outlet pipe; a reverse water outlet pipe, wherein a first end of the reverse water outlet pipe is connected to the forward water inlet pipe, and a second end of the reverse water outlet pipe is connected to external seawater; There are two second valve bodies, one of which is provided on the forward water inlet pipe and located at the front end of the first end of the reverse water outlet pipe, and the other is provided on the forward water outlet pipe and located between the rear end of the second end of the reverse water inlet pipe and the front end of the second end of the reverse water outlet pipe; There are two third valve bodies, one of which is provided on the reverse water inlet pipe and the other is provided on the reverse water outlet pipe; There are two pressure pulse generators, one of which is arranged on the forward water inlet pipe and the other is arranged on the reverse water inlet pipe; as well as A controller is electrically connected to the first valve body, the second valve body, the third valve body, the seawater pump, the pressure pulse generator and the ultrasonic generator.

2. The cooling and flushing device for freshwater heat exchanger of a ship main engine according to claim 1, characterized in that: There are two seawater pumps, one for use and one for backup, which are arranged in parallel on the seawater supply pipe.

3. The cooling and flushing device for the freshwater heat exchanger of a ship main engine according to claim 2, characterized in that: It also includes a fourth valve body and a fifth valve body. The fourth valve body is arranged on the seawater supply pipe and located at the front end of each seawater pump; the fifth valve body is a stop check valve, which is arranged on the seawater supply pipe and located at the rear end of each seawater pump.

4. The cooling and flushing device for the freshwater heat exchanger of a ship main engine according to claim 3, characterized in that: It also includes a sixth valve body, which is a stop check valve and is arranged at the second end of the forward water outlet pipe.

5. The cooling and flushing device for freshwater heat exchanger of a ship main engine according to claim 4, characterized in that: Temperature sensors are installed at the inlet and outlet of the main fresh water heat exchanger, and flow meters are installed on the forward water inlet pipe, forward water outlet pipe, reverse water inlet pipe and reverse water outlet pipe. The temperature sensors and flow meters are electrically connected to the controller.

6. A method for using the device for cooling and flushing a freshwater heat exchanger for a marine main engine according to any one of claims 1 to 5, characterized in that: Automatic operation through the controller includes the following steps: Step S1, forward cooling and flushing with seawater: Open the first and second valve bodies, close the third valve body, and activate the pressure pulse generator on the forward water inlet pipe. The seawater supply pipe inputs external seawater, which passes through the forward water inlet pipe and enters the inlet of the main engine fresh water heat exchanger. It exchanges heat in the main engine fresh water heat exchanger and flushes the heat exchange surface. Then, it enters the forward water outlet pipe from the outlet of the main engine fresh water heat exchanger and is discharged from the ship. Step S2, seawater reverse flushing: Close the second valve body, open the third valve body, and activate the pressure pulse generator on the reverse water inlet pipe. Seawater passes through the reverse water inlet pipe and enters from the outlet of the main engine fresh water heat exchanger, flushes the heat exchange surface in the main engine fresh water heat exchanger, and then enters the reverse water outlet pipe from the inlet of the main engine fresh water heat exchanger and is discharged from the ship; In step S1 and step S2, while the seawater pump pumps seawater, the ultrasonic generator in the main engine freshwater heat exchanger emits ultrasonic pulses.

7. The method for cooling and flushing a freshwater heat exchanger of a ship main engine according to claim 6, characterized in that: The temperature sensor sends the detected temperature signal to the controller, and the flow meter sends the detected flow signal to the controller. The controller automatically adjusts the opening of each valve body according to the temperature data and the flow data to adjust the seawater flow.

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