A marine main engine cooling system and a marine

Abstract

The application relates to a ship main engine cooling system and a ship, and belongs to the technical field of ship engineering. The ship main engine cooling system comprises a closed circulation loop which comprises a ship main engine and an outboard cooler connected by pipelines and forming circulation; and a waste heat utilization device which comprises an electric water heater and a waste heat utilization pipeline arranged in the electric water heater. The waste heat utilization pipeline is arranged on the closed circulation loop and located downstream of the outlet of the ship main engine. The waste heat utilization pipeline of the application is arranged downstream of the outlet of the ship main engine, can directly receive high-temperature cooling water flowing out of the ship main engine, and can efficiently transfer the waste heat of the high-temperature cooling water to the electric water heater for heating domestic water, thereby significantly reducing the power demand of the electric water heater, avoiding waste of a large amount of waste heat directly circulating to the outboard cooler, realizing full recycling of the heat taken away by the cooled water, and effectively solving the problem of insufficient waste heat utilization.

Description

Technical Field

[0001] This application relates to the field of marine engineering technology, and in particular to a marine main engine cooling system and a ship. Background Technology

[0002] Currently, the mainstream international marine vessels adopt a central cooling system, which includes three systems: seawater cooling, low-temperature freshwater cooling, and high-temperature freshwater cooling. The cooling sequence is seawater → low-temperature freshwater → high-temperature freshwater cooling. This system has significant advantages: seawater indirectly cools the freshwater, greatly reducing pipeline corrosion and maintenance costs; high-temperature and low-temperature freshwater cooling separate systems cool different equipment, enhancing adaptability and equipment performance, and improving system reliability.

[0003] In existing technologies, the waste heat (heat energy carried by high-temperature fresh water) carried away by water during the cooling process of the system equipment is not effectively recovered and is directly emitted into the environment, resulting in serious energy waste. This leads to increased ship energy consumption and operating costs, and contradicts the "green and low-carbon" development trend of the shipping industry. Therefore, it is necessary to study and improve the existing structure to provide a ship main engine cooling system and ship that can achieve a more practical purpose. Summary of the Invention

[0004] In view of the shortcomings or deficiencies mentioned above in the background art, the present application provides a marine main engine cooling system and a ship to solve the problem that the heat carried away by cooling water cannot be fully utilized in the related art.

[0005] In a first aspect, embodiments of this application provide a marine main engine cooling system, including: A closed-loop circulation system, comprising a ship's main engine and an outboard cooler connected by piping to form a circulation loop; The waste heat recovery device includes an electric hot water tank and a waste heat recovery pipeline installed inside the electric hot water tank. The waste heat recovery pipeline is installed on the closed-loop circuit and located downstream of the outlet of the ship's main engine, and is used to recover the waste heat of the ship's main engine for use in the electric hot water tank.

[0006] In one aspect, in some embodiments, the closed-loop circulation includes a heating channel disposed within the electric hot water tank and configured to exchange heat with the heating element within the tank, the heating channel being disposed on the closed-loop circulation and located upstream of the inlet of the ship's main engine.

[0007] In a first aspect, in some embodiments, the closed-loop circulation includes a first bypass passage disposed between the ship's main engine outlet and the heating channel inlet for bypassing the outboard cooler, and a first valve cooperating with the first bypass passage to partially or completely divert fluid flowing to the outboard cooler.

[0008] In a first aspect, in some embodiments, the closed-loop circulation includes a second bypass passage disposed between the outlet of the outboard cooler and the inlet of the ship's main engine for bypassing the heating channel, and a second valve cooperating with the second bypass passage to partially or completely divert the fluid flowing to the heating channel.

[0009] In a first aspect, in some embodiments, the closed-loop circulation includes a third bypass passage disposed between the ship's main engine outlet and the outboard cooler inlet for bypassing the waste heat recovery pipeline, and a third valve cooperating with the third bypass passage to partially or completely divert fluid flowing to the waste heat recovery pipeline.

[0010] In a first aspect, in some embodiments, the waste heat utilization device further includes a water generator connected between the ship's main engine outlet and the outboard cooler inlet to utilize the waste heat of the ship's main engine for auxiliary heating, and a fourth valve for partially or completely diverting the fluid flowing to the water generator.

[0011] In some embodiments, the closed-loop circuit is provided with a branch passage connected in parallel with the ship's main engine and a fifth valve for regulating the flow of the branch passage. The branch passage is provided with heat load equipment, which includes a generator, an air conditioning compressor, or an air conditioning condenser.

[0012] In a first aspect, in some embodiments, the closed-loop circulation includes a return flow path for returning fluid from the outlet end of the ship's main engine to the inlet end, and the return flow path is provided with a regulating valve for adjusting the flow rate. An expansion tank for pressure control and media compensation is connected to the closed-loop circulation system.

[0013] In one aspect, in some embodiments, the outboard cooler is a box-type cooler, which includes a cooling tube bundle for contacting the external waters of the ship, an inlet flange communicating with the inlet end of the cooling tube bundle, and an outlet flange communicating with the outlet end of the cooling tube bundle.

[0014] Secondly, embodiments of this application provide a ship, including: The ship's main engine cooling system described in any of the above items.

[0015] The beneficial effects of the technical solution provided in this application include: This application provides a ship engine cooling system and a ship, which is a closed-loop system. The system includes a ship engine and an outboard cooler connected by pipelines to form a loop. The waste heat utilization device includes an electric hot water tank and a waste heat utilization pipeline installed in the electric hot water tank. The waste heat utilization pipeline is installed on the closed-loop system and located downstream of the outlet of the ship engine.

[0016] Therefore, the waste heat utilization pipeline is arranged downstream of the ship's main engine outlet, which can directly receive the high-temperature cooling water flowing out of the ship's main engine and efficiently transfer its waste heat to the electric hot water tank for heating domestic water, significantly reducing the power demand of the electric hot water tank. At the same time, it avoids a large amount of waste heat being directly circulated to the outboard cooler and wasted, realizing the full recovery and utilization of the heat carried away by the cooling water, and effectively solving the problem of insufficient waste heat utilization. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the ship's main engine cooling system according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the external cooler according to an embodiment of this application; Figure 3 This is a structural side view of the external cooler according to an embodiment of this application; Figure 4 This is a top view of the structure of the external cooler according to an embodiment of this application.

[0019] The attached diagram lists the components represented by each number as follows: 1. Main engine; 2. Outboard cooler; 21. Cooling tube bundle; 22. Inlet flange; 23. Outlet flange; 3. Electric hot water tank; 31. Waste heat recovery pipeline; 32. Heating flow channel; 4. First bypass passage; 5. First valve; 6. Second bypass passage; 7. Second valve; 8. Third bypass passage; 9. Third valve; 10. Water maker; 11. Fourth valve; 12. Branch passage; 13. Fifth valve; 14. Heat load equipment; 15. Return passage; 16. Regulating valve; 17. Expansion tank. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In view of the shortcomings or deficiencies mentioned above in the background art, the present application provides a marine main engine cooling system and a ship to solve the problem that the heat carried away by cooling water cannot be fully utilized in the related art.

[0022] See Figures 1 to 4 As shown, the first aspect of this application provides a marine main engine cooling system, including: A closed-loop circulation system includes a ship's main engine 1 and an outboard cooler 2 connected by pipelines to form a circulation. The waste heat recovery device includes an electric hot water tank 3 and a waste heat recovery pipeline 31 installed in the electric hot water tank 3. The waste heat recovery pipeline 31 is installed on a closed loop and located downstream of the outlet of the ship's main engine 1, and is used to recover the waste heat of the ship's main engine 1 for use in the electric hot water tank 3.

[0023] In the marine main engine cooling system of this application embodiment, fresh water can be used as the cooling medium in the closed-loop circuit. The marine main engine 1 drives the fresh water to circulate in the circuit through its own engine-driven pump. During normal operation, the fresh water flows through the marine main engine 1, absorbs waste heat, and is converted into high-temperature fresh water, which is then transported to the downstream waste heat utilization pipeline 31. Waste heat utilization pipeline 31 efficiently transfers the waste heat of high-temperature fresh water to electric hot water tank 3 for heating domestic water, significantly reducing the power demand of electric hot water tank 3. At the same time, it avoids a large amount of waste heat being directly circulated to the external cooler 2 and wasted, thereby realizing the full recovery and utilization of the heat carried away by the cooling water and solving the problem of insufficient waste heat utilization.

[0024] It should be noted that, depending on the ship type, one or more main engines 1 can be connected in parallel to the cooling system; similarly, the number of outboard coolers 2 can be flexibly increased or decreased according to the actual cooling needs of the ship, supporting on-demand configuration or redundant backup, to ensure that the system efficiently adapts to the thermal management requirements of ships of different sizes.

[0025] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a marine main engine cooling system. The closed-loop circulation of the marine main engine cooling system includes a heating channel 32 disposed in an electric hot water tank 3 and configured to exchange heat with the heating element inside the tank. The heating channel 32 is disposed on the closed-loop circulation and located upstream of the inlet of the marine main engine 1.

[0026] In this embodiment, the closed-loop circulation includes a heating channel 32 installed inside the electric hot water tank 3, which exchanges heat with the heating element inside the tank. For example, the heating channel 32 is a metal heat-conducting pipe, and the heating element is an electric heating wire surrounding the heat-conducting pipe. The heating channel 32 is connected to the closed-loop circulation and located upstream of the inlet of the ship's main engine 1. It can directly deliver heated cooling water to the ship's main engine 1 during the start-up preparation phase, achieving a warm-up function and effectively avoiding thermal stress damage to the equipment during cold starts.

[0027] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a ship engine cooling system. The closed-loop circulation of the ship engine cooling system includes a first bypass passage 4 disposed between the outlet of the ship engine 1 and the inlet of the heating flow channel 32 for bypassing the outboard cooler 2, and a first valve 5 cooperating with the first bypass passage 4 to partially or completely divert the fluid flowing to the outboard cooler 2.

[0028] In this embodiment, the closed-loop circulation circuit is provided with a first bypass passage 4 for bypassing the outboard cooler 2, thus preventing the heat from the high-temperature water from being exchanged to the outside and wasted in the outboard cooler 2. For example, the first valve 5 includes a temperature control valve on the first bypass passage 4 and a shut-off valve connected to the inlet end of the outboard cooler 2. When the shut-off valve is open, the opening degree can be adjusted by the temperature control valve to allow some cooling water to flow to the outboard cooler 2. When warming up the cylinder, the shut-off valve is closed so that the cooling water bypasses the outboard cooler 2, ensuring that all the high-temperature heat output from the heating channel 32 is used for warming up the main engine 1, thereby improving the warming up efficiency of the main engine 1. In other embodiments, the first valve 5 can be a three-way valve and installed at the pipe junction of the inlet of the first bypass channel 4 to achieve precise diversion control of the cooling water.

[0029] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a marine main engine cooling system. The closed-loop circulation of the marine main engine cooling system includes a second bypass passage 6 disposed between the outlet of the outboard cooler 2 and the inlet of the marine main engine 1 for bypassing the heating flow channel 32, and a second valve 7 cooperating with the second bypass passage 6 to partially or completely divert the fluid flowing to the heating flow channel 32.

[0030] In this embodiment, the closed-loop circulation circuit is provided with a second bypass passage 6 for bypassing the heating channel 32; the second valve 7 is a three-way valve, installed at the inlet end of the second bypass passage 6. By regulating the flow rate entering the heating channel 32 and the second bypass passage 6, the temperature of the high-temperature freshwater entering the ship's main engine 1 can be controlled to maintain it within the range required for tank warming. In other embodiments, adjustable valves can be installed on the heating channel 32 and the second bypass passage 6 respectively, which can also achieve precise flow control.

[0031] In addition, in this embodiment, the external coolers 2 can be symmetrically arranged on the port and starboard sides of the hull to achieve redundancy. Under normal operating conditions, both coolers can be used simultaneously to optimize cooling effect; in the event of extremely low load or unilateral leakage, the faulty cooler can be isolated to ensure continuous system operation and reduce maintenance costs.

[0032] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application provides a marine main engine cooling system. The closed-loop circulation of the marine main engine cooling system includes a third bypass passage 8 disposed between the outlet of the marine main engine 1 and the inlet of the outboard cooler 2 for bypassing the waste heat utilization pipeline 31, and a third valve 9 cooperating with the third bypass passage 8 to partially or completely divert the fluid flowing to the waste heat utilization pipeline 31.

[0033] In this embodiment, a third bypass passage 8 is provided in the closed-loop circulation system to bypass the waste heat utilization pipeline 31. The third valve 9 is a three-way valve installed at the inlet of the third bypass passage 8. By adjusting the flow rate into the waste heat utilization pipeline 31 and the third bypass passage 8, the amount of waste heat delivered to the waste heat utilization pipeline 31 is controlled, enabling the electric water heater 3 to accurately control the domestic water temperature range using waste heat. In other embodiments, adjustable valves can be configured on the waste heat utilization pipeline 31 and the third bypass passage 8 to similarly meet the flow rate control requirements.

[0034] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a ship main engine cooling system. The waste heat utilization device of the ship main engine cooling system further includes a water generator 10 connected between the outlet of the ship main engine 1 and the inlet of the outboard cooler 2 to utilize the waste heat of the ship main engine 1 for auxiliary heating, and a fourth valve 11 for partially or completely diverting the fluid flowing to the water generator 10.

[0035] In this embodiment, a water maker 10 is added to the waste heat recovery device and connected between the outlet of the ship's main engine 1 and the inlet of the outboard cooler 2. This allows the waste heat from the main engine to assist in heating the water production process, reducing electricity consumption. The fourth valve 11 is a three-way valve installed at the junction of the outlet pipe of the ship's main engine 1 and the inlet pipe of the water maker 10. By adjusting the flow rate into the water maker 10, the waste heat can be precisely matched to the needs of the water maker 10, reducing heat waste. In other embodiments, an adjustable valve can be configured on the inlet pipe of the water maker 10, which can also achieve efficient flow control.

[0036] It should be noted that the water maker 10 can be connected to a closed-loop system by installing waste heat utilization pipelines, and directly use the waste heat of the high-temperature fresh water from the ship's main engine outlet to assist in heating the water production process, thereby achieving efficient waste heat recovery. This method works in conjunction with the waste heat utilization of the electric hot water tank 3 to significantly reduce system energy consumption and improve the overall energy efficiency of the ship.

[0037] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a marine main engine cooling system. The closed-loop circulation of the marine main engine cooling system is provided with a branch passage 12 connected in parallel with the marine main engine 1 and a fifth valve 13 for regulating the flow of the branch passage 12. A heat load device 14 is provided on the branch passage 12, and the heat load device 14 includes a generator, an air conditioning compressor or an air conditioning condenser.

[0038] In this embodiment, a branch passage 12 is added to the closed-loop circulation system in parallel with the main engine 1. The fifth valve 13 is a three-way valve and is installed at the junction of the inlet of the branch passage 12 and the inlet pipe of the main engine 1. The cooling water after the outboard cooler 2 is cooled can be diverted to the heat load equipment 14 for cooling.

[0039] The heat load equipment 14 includes a generator, an air conditioning compressor, or a condenser, etc., and can be connected in series with the branch passage 12 through its own cooling flow channel. The branch passage 12 can be equipped with a water pump and a shut-off valve located upstream of the heat load equipment 14 to control the cooling water flow rate and on / off, thereby improving the cooling efficiency of the heat load equipment 14.

[0040] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a marine main engine cooling system. The closed-loop circulation of the marine main engine cooling system includes a return flow path 15 for returning fluid from the outlet end of the marine main engine 1 to the inlet end. A regulating valve 16 for adjusting the flow rate is provided on the return flow path 15. An expansion tank 17 for pressure stabilization and medium compensation is connected to the closed-loop circulation.

[0041] In this embodiment, the closed-loop circuit is provided with a return pipeline for returning the cooling water from the outlet of the ship's main engine 1 to the inlet end. A temperature control valve can be configured on the return pipeline as a regulating valve 16 to control the mixing ratio of the high-temperature fresh water from the outlet of the ship's main engine 1 and the low-temperature fresh water output from the outboard cooler 2 by adjusting the flow rate, so as to ensure that the temperature of the cooling water entering the ship's main engine 1 is accurately matched to the requirements.

[0042] In addition, an expansion tank 17 is connected to the closed-loop circulation circuit for pressure stabilization and medium compensation. A shut-off valve is installed at its inlet end to facilitate system maintenance and repair.

[0043] Firstly, in some alternative embodiments: see Figures 1 to 4As shown, this application embodiment provides a ship main engine cooling system. The outboard cooler 2 of the ship main engine cooling system is a box-type cooler, which includes a cooling tube bundle 21 for contacting the external water of the ship, an inlet flange 22 communicating with the inlet end of the cooling tube bundle 21, and an outlet flange 23 communicating with the outlet end of the cooling tube bundle 21.

[0044] In this embodiment, the outboard cooler 2 is a box-type cooler, comprising a cooling tube bundle 21 in contact with the external water of the ship, an inlet flange 22 communicating with the inlet of the tube bundle, and an outlet flange 23 communicating with the outlet end, which is directly connected to a closed-loop circulation circuit. Fresh water is used as the cooling medium inside, and the high-temperature fresh water efficiently exchanges heat with the external seawater in the cooling tube bundle 21 to achieve cooling. This eliminates the need for a separate seawater circulation pipeline, significantly simplifying the system structure, reducing maintenance costs, and improving operational reliability.

[0045] See Figures 1 to 4 As shown, a second aspect of this application provides a ship, including: The ship's main engine cooling system of any of the above embodiments.

[0046] The ship in this application adopts the ship main engine cooling system of any of the above embodiments, which can efficiently recover the waste heat of the ship main engine 1 for heating of the electric hot water tank 3, water production of the water maker 10 and cooling of the heat load equipment 14, realize efficient utilization of waste heat, significantly reduce energy consumption, reduce carbon emissions, meet the requirements of green shipping, and improve system reliability and energy efficiency.

[0047] For example, in this embodiment, both the port and starboard sides of the ship are equipped with outboard coolers 2. During the warm-up operation, fresh water flows out from the port outboard cooler 2 and is divided by the fifth valve 13: part of it is sent to the heat load equipment 14 (equipment that requires low-temperature fresh water cooling, such as auxiliary engines, air conditioners, etc.), and part of it is sent through the second valve 7 to the heating channel 32 of the electric hot water tank 3 (the electric hot water tank 3 can be heated by electric heating wire, and the temperature is controlled at about 80°C) to preheat the ship's main engine 1.

[0048] After the ship's main engine 1 starts, the high-temperature freshwater is mixed with the low-temperature freshwater via reflux. Part of the mixture enters the water maker 10 to utilize waste heat, while the rest is heated for domestic water via waste heat utilization pipeline 31. Excess heat is cooled by the outboard cooler 2. The coolers on both port and starboard sides are equipped with bypass temperature control valves to adjust the bypass flow rate. When water is scarce, the expansion tank 17 is replenished. The main engine has an integrated pump to provide power for freshwater circulation. A water pump and shut-off valve are installed upstream of the heat load equipment 14 to achieve efficient system operation and efficient utilization of waste heat.

[0049] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A marine main engine cooling system, characterized in that, include: A closed-loop circulation system includes a ship's main engine (1) and an outboard cooler (2) connected by pipes to form a circulation. The waste heat utilization device includes an electric hot water tank (3) and a waste heat utilization pipeline (31) installed in the electric hot water tank (3). The waste heat utilization pipeline (31) is installed on the closed circulation loop and located downstream of the outlet of the ship's main engine (1).

2. The marine main engine cooling system as described in claim 1, characterized in that: The closed-loop circulation includes a heating channel (32) disposed in the electric hot water tank (3) and configured to exchange heat with the heating element inside the tank. The heating channel (32) is disposed on the closed-loop circulation and located upstream of the inlet of the ship's main engine (1).

3. The marine main engine cooling system as described in claim 2, characterized in that: The closed-loop circulation includes a first bypass passage (4) disposed between the outlet of the ship's main engine (1) and the inlet of the heating channel (32) for bypassing the outboard cooler (2), and a first valve (5) cooperating with the first bypass passage (4) to partially or completely divert the fluid flowing to the outboard cooler (2).

4. The marine main engine cooling system as described in claim 2 or 3, characterized in that: The closed-loop circulation includes a second bypass passage (6) located between the outlet of the outboard cooler (2) and the inlet of the ship's main engine (1) for bypassing the heating channel (32), and a second valve (7) cooperating with the second bypass passage (6) to partially or completely divert the fluid flowing to the heating channel (32).

5. The marine main engine cooling system as described in claim 1, characterized in that: The closed-loop circulation includes a third bypass passage (8) located between the outlet of the ship's main engine (1) and the inlet of the outboard cooler (2) for bypassing the waste heat utilization pipeline (31), and a third valve (9) cooperating with the third bypass passage (8) to partially or completely divert the fluid flowing to the waste heat utilization pipeline (31).

6. The marine main engine cooling system as described in claim 1, characterized in that: The waste heat utilization device also includes a water generator (10) connected between the outlet of the ship's main engine (1) and the inlet of the outboard cooler (2) to utilize the waste heat of the ship's main engine (1) for auxiliary heating, and a fourth valve (11) for partially or completely diverting the fluid flowing to the water generator (10).

7. The marine main engine cooling system as described in claim 1, characterized in that: The closed-loop circuit is provided with a branch passage (12) connected in parallel with the ship's main engine (1) and a fifth valve (13) for regulating the flow of the branch passage (12). The branch passage (12) is provided with a heat load device (14), which includes a generator, an air conditioning compressor or an air conditioning condenser.

8. The marine main engine cooling system as described in claim 1, characterized in that: The closed-loop circulation includes a return flow path (15) for returning fluid from the outlet end of the ship's main engine (1) to the inlet end, and a regulating valve (16) for adjusting the flow rate is provided on the return flow path (15); an expansion tank (17) for pressure stabilization and medium compensation is connected to the closed-loop circulation.

9. The marine main engine cooling system as described in claim 1, characterized in that: The outboard cooler (2) is a box-type cooler, which includes a cooling tube bundle (21) for contacting the external water of the ship, an inlet flange (22) connected to the inlet end of the cooling tube bundle (21), and an outlet flange (23) connected to the outlet end of the cooling tube bundle (21).

10. A ship, characterized in that, include: The ship engine cooling system according to any one of claims 1 to 9.

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