A method of cooling a marine in-hull generator

Abstract

The application discloses a ship in-dock generator cooling method, comprising the following steps: pumping seawater to a first ballast tank and a second ballast tank; starting the generator to test the generator; determining the number of generators in a first tail pump cabin; if all the generators in the first tail pump cabin are started, pumping seawater to a first cooler through a first branch pipe, and pumping seawater in the first ballast tank to the first cooler; determining the number of generators in a second tail pump cabin; if all the generators in the second tail pump cabin are started, pumping seawater to a second cooler through the first branch pipe and pumping seawater to the second cooler through a second branch pipe; determining the number of generators in a third tail pump cabin; if all the generators in the third tail pump cabin are started, pumping seawater to a third cooler through the second branch pipe, and pumping seawater in the second ballast tank to the third cooler. The ship in-dock generator cooling method can meet the cooling requirement when six generators work simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, and in particular to a method for cooling a generator in a ship dock. BACKGROUND

[0002] A ship is launched after being built to a certain extent in a dock, and is moored at a wharf, and the remaining construction work is completed at the wharf. A large amount of equipment commissioning work needs to be carried out during the construction of the ship at the wharf, and some of the equipment commissioning work needs to use the generator on the ship to provide power. Therefore, the generator of the ship needs to complete all the test work during the construction in the dock to achieve a normal use level.

[0003] When the ship is tested in the dock, sea water needs to be used to cool the generator, so as to ensure the normal test of the generator. According to the power of the generator, the amount of sea water required is different. At present, the method for cooling the generator during the test of the generator in the ship dock is to connect a tooling hose to the fire water main of the fire corridor at the edge of the dock, and connect the other end of the tooling hose to the plate cooler on the ship, and use the plate cooler to provide cooling sea water to cool the generator. However, this method is only suitable for generators with a power of less than 3000KW. The existing ship is equipped with six generators, and the power of each generator is greater than 3000KW. Therefore, the existing method for cooling the generator in the ship dock cannot meet the test requirements of the six generators, and cannot provide enough sea water to cool the six generators. SUMMARY

[0004] The purpose of the present application is to provide a method for cooling a generator in a ship dock, so as to solve the problem that the existing method for cooling the generator in the ship dock cannot meet the test requirements of the six generators, and cannot provide enough sea water to cool the six generators.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A method for cooling generators in a ship dock, the ship comprising a first stern pump room, a second stern pump room and a third stern pump room which are spaced apart along the width direction of the ship, the first stern pump room, the second stern pump room and the third stern pump room are each provided with two generators, the ship further comprises a first ballast tank and a second ballast tank which are spaced apart along the width direction of the ship, a fire-fighting seawater main is communicated with a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe each extend to the stern pump room of the ship, a first cooler in the first stern pump room is communicated with the first branch pipe through a pipeline, a second cooler in the second stern pump room is communicated with the first branch pipe through a pipeline, the second cooler in the second stern pump room is further communicated with the second branch pipe through a pipeline, a third cooler in the third stern pump room is communicated with the second branch pipe through a pipeline, the first ballast tank is communicated with the first branch pipe through a pipeline, the first ballast tank is further communicated with the first cooler through a pipeline, the second ballast tank is communicated with the second branch pipe through a pipeline, and the second ballast tank is further communicated with the third cooler through a pipeline; the method for cooling generators in the ship dock comprises:

[0007] Pumping seawater to the first ballast tank and the second ballast tank;

[0008] Starting the generators to perform generator test;

[0009] Determining the number of generators in the first stern pump room which are in operation, if all the generators in the first stern pump room are in operation, pumping seawater to the first cooler through the first branch pipe, and pumping seawater in the first ballast tank to the first cooler;

[0010] Determining the number of generators in the second stern pump room which are in operation, if all the generators in the second stern pump room are in operation, pumping seawater to the second cooler through the first branch pipe, and pumping seawater to the second cooler through the second branch pipe;

[0011] Determining the number of generators in the third stern pump room which are in operation, if all the generators in the third stern pump room are in operation, pumping seawater to the third cooler through the second branch pipe, and pumping seawater in the second ballast tank to the third cooler.

[0012] As a preferred, determining the number of generators in the first stern pump room which are in operation further comprises the following steps:

[0013] If one generator in the first stern pump room is in operation, pumping seawater to the first cooler through the first branch pipe, and disconnecting the first ballast tank from the first cooler.

[0014] As a preferred solution of the above-mentioned ship in-dock generator cooling method, pumping seawater to the first cooler through the first branch pipe, after disconnecting the communication between the first ballast tank and the first cooler, further comprises the following steps:

[0015] Real-time monitoring the temperature of the first cooler, determining whether the temperature of the first cooler is greater than a first set temperature range, if yes, pumping seawater in the first ballast tank to the first cooler.

[0016] As a preferred solution of the above-mentioned ship in-dock generator cooling method, determining the number of generators in use of the third tail pump cabin further comprises the following steps:

[0017] If one generator in the third tail pump cabin is in use, pumping seawater to the third cooler through the second branch pipe, disconnecting the communication between the second ballast tank and the third cooler.

[0018] As a preferred solution of the above-mentioned ship in-dock generator cooling method, pumping seawater to the third cooler through the second branch pipe, after disconnecting the communication between the second ballast tank and the third cooler, further comprises the following steps:

[0019] Real-time monitoring the temperature of the third cooler, determining whether the temperature of the third cooler is greater than a second set temperature range, if yes, pumping seawater in the second ballast tank to the third cooler.

[0020] As a preferred solution of the above-mentioned ship in-dock generator cooling method, determining the number of generators in use of the second tail pump cabin further comprises the following steps:

[0021] If one generator in the second tail pump cabin is in use, pumping seawater to the second cooler through the first branch pipe, disconnecting the communication between the second branch pipe and the second cooler.

[0022] As a preferred solution of the above-mentioned ship in-dock generator cooling method, pumping seawater to the second cooler through the first branch pipe, after disconnecting the communication between the second branch pipe and the second cooler, further comprises the following steps:

[0023] Real-time monitoring the temperature of the second cooler, determining whether the temperature of the second cooler is greater than a third set temperature range, if yes, pumping seawater to the second cooler through the second branch pipe.

[0024] As a preferred solution of the above-mentioned ship in-dock generator cooling method, the first ballast tank and the second ballast tank are both installed with liquid level monitoring devices, and the ship in-dock generator cooling method further comprises:

[0025] Real-time monitoring of the water level of the first ballast tank and the second ballast tank, if the water level of the first ballast tank is greater than the first set water level, stop pumping seawater into the first ballast tank, if the water level in the second ballast tank is greater than the second set water level, stop pumping seawater into the second ballast tank.

[0026] As a preferred solution of the above-mentioned ship dock generator cooling method, the first tail pump room, the second tail pump room and the third tail pump room are all provided with a drain port, the first cooler is connected to the drain port of the first tail pump room through a pipeline, the second cooler is connected to the drain port of the second tail pump room through a pipeline, the third cooler is connected to the drain port of the third tail pump room through a pipeline, a water level monitoring device is installed on the dock bottom, a submersible pump is installed on the dock bottom, the submersible pump is used to pump seawater in the dock to outside the dock, the generator is started, and after the generator test, the following steps are further included:

[0027] The heat exchange waste water of the first cooler, the second cooler and the third cooler is discharged to the dock bottom;

[0028] Real-time monitoring of the water level of the dock bottom, if the water level of the dock bottom is higher than the set safety height, the submersible pump is controlled to discharge the waste water of the dock bottom to outside the dock.

[0029] The beneficial effects of the present application are:

[0030] The application provides a ship dock generator cooling method, which comprises the following steps: pumping seawater to a first ballast tank and a second ballast tank; starting a generator to perform a generator test; determining the number of generators in a first tail pump cabin that are in operation; if all the generators in the first tail pump cabin are in operation, pumping seawater to a first cooler through a first branch pipe and pumping seawater in the first ballast tank to the first cooler; determining the number of generators in a second tail pump cabin that are in operation; if all the generators in the second tail pump cabin are in operation, pumping seawater to a second cooler through the first branch pipe and pumping seawater to the second cooler through a second branch pipe; determining the number of generators in a third tail pump cabin that are in operation; if all the generators in the third tail pump cabin are in operation, pumping seawater to a third cooler through the second branch pipe and pumping seawater in the second ballast tank to the third cooler. In detail, before the generator test, a certain amount of seawater is stored in the first ballast tank and the second ballast tank. During the test, the working conditions of the generators are determined, and when the two generators in the first tail pump cabin are both started, the seawater in the fire-fighting seawater main pipe is pumped to the first cooler through the first branch pipe, and the seawater in the first ballast tank is also pumped to the first cooler, so that the cooling requirement of the two generators in the first tail pump cabin working simultaneously can be met; similarly, when the two generators in the third tail pump cabin are both started, the seawater in the fire-fighting seawater main pipe is pumped to the third cooler through the second branch pipe, and the seawater in the second ballast tank is also pumped to the third cooler, so that the cooling requirement of the two generators in the third tail pump cabin working simultaneously can be met; when the two generators in the second tail pump cabin are both started, the seawater is pumped to the second cooler through the first branch pipe and the second branch pipe, so that the cooling requirement of the two generators in the second tail pump cabin working simultaneously can be met.

[0031] Therefore, the ship dock generator cooling method can meet the cooling requirement of the six generators working simultaneously by using the first ballast tank, the second ballast tank and the fire-fighting seawater main pipe to provide cooling seawater for the generators. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Figure 1 is a connection diagram of a ship, a fire-fighting seawater main pipe, a first branch pipe and a second branch pipe provided by an embodiment of the application;

[0033] Figure 2 Figure 2 is a flowchart of a ship dock generator cooling method provided by an embodiment of the application.

[0034] In the drawings:

[0035] 11, first tail pump cabin; 111, first cooler; 12, second tail pump cabin; 121, second cooler; 13, third tail pump cabin; 131, third cooler; 14, first ballast tank; 15, second ballast tank;

[0036] 2. fire water main; 21. first branch; 22. second branch. DETAILED DESCRIPTION

[0037] The application will be further described below in conjunction with the drawings and examples. It is to be understood that the examples described herein are merely illustrative of the present application and are not in any way to be construed as limiting the present application. In addition, it should also be understood that, for the purpose of convenience and brevity, only those structures of the present application that are relevant to the present application are shown in the drawings.

[0038] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "up", "down", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0041] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0042] At present, the generator cooling method for generator test in the ship dock is that a tooling hose is connected to the fire-fighting sea water main of the fire-fighting corridor at the dock side, and the other end of the tooling hose is connected to the plate cooler on the ship, and the plate cooler is used to provide cooling sea water to cool the generator. However, this method is only suitable for generators with power less than 3000KW. The existing ship is equipped with six generators, and the power of each generator is greater than 3000KW. Therefore, the existing generator cooling method in the ship dock cannot meet the test requirements of the six generators, and cannot provide enough sea water to cool the six generators. To solve the above problems, the technical scheme is provided as follows.

[0043] Embodiment one

[0044] As shown in Figure 1 Embodiment one of the present application provides a ship, which comprises a first tail pump cabin 11, a second tail pump cabin 12 and a third tail pump cabin 13 distributed along the width direction of the ship, and each of the first tail pump cabin 11, the second tail pump cabin 12 and the third tail pump cabin 13 is equipped with two generators. When the generators are tested, any two, three, four, five or six generators can be selected to be started. The ship further comprises a first ballast tank 14 and a second ballast tank 15 arranged along the width direction of the ship, and the fire-fighting sea water main 2 is communicated with a first branch pipe 21 and a second branch pipe 22, and the first branch pipe 21 and the second branch pipe 22 both extend to the tail pump cabin of the ship. The first cooler 111 in the first tail pump cabin 11 is connected to the first branch pipe 21 through a pipeline, the second cooler 121 in the second tail pump cabin 12 is connected to the first branch pipe 21 through a pipeline, the second cooler 121 in the second tail pump cabin 12 is also connected to the second branch pipe 22 through a pipeline, the third cooler 131 in the third tail pump cabin 13 is connected to the second branch pipe 22 through a pipeline, the first ballast tank 14 is connected to the first branch pipe 21 through a pipeline, the first ballast tank 14 is also connected to the first cooler 111 through a pipeline, the second ballast tank 15 is connected to the second branch pipe 22 through a pipeline, and the second ballast tank 15 is also connected to the third cooler 131 through a pipeline.

[0045] In detail, the first cooler 111 is used to cool the two generators in the first tail pump cabin 11, the second cooler 121 is used to cool the two generators in the second tail pump cabin 12, and the third cooler 131 is used to cool the two generators in the third tail pump cabin 13. More specifically, the first cooler 111, the second cooler 121 and the third cooler are all fresh water coolers.

[0046] It should be noted that control valves are installed between the above-mentioned pipelines to selectively open or close the pipelines. In order to avoid redundancy, this embodiment will not be described in detail.

[0047] It should be noted that in the embodiment, the water pump is used to provide power for the seawater delivery, and the specific number and installation position of the water pump are not described.

[0048] Specifically, the first ballast tank 14 and the second ballast tank 15 are both provided with a liquid level monitoring device. The liquid level monitoring device is used to detect the liquid level of the first ballast tank 14 and the second ballast tank 15. Preferably, the liquid level monitoring device is a liquid level sensor.

[0049] Specifically, the first tail pump cabin 11, the second tail pump cabin 12 and the third tail pump cabin 13 are all provided with a drain port, the first cooler 111 is connected to the drain port of the first tail pump cabin 11 through a pipeline, the second cooler 121 is connected to the drain port of the second tail pump cabin 12 through a pipeline, the third cooler 131 is connected to the drain port of the third tail pump cabin 13 through a pipeline, a water level monitoring device is installed on the dock bottom, and a submersible pump is installed on the dock bottom. The submersible pump is used to pump seawater in the dock to outside the dock. In detail, the waste water after heat exchange of the first cooler 111, the second cooler 121 and the third cooler 131 is discharged to the dock bottom through the drain port, and the water level of the waste water in the dock bottom is monitored by the water level monitoring device. When the water level reaches a certain height, the submersible pump is used to discharge the waste water to outside the dock. Preferably, the water level monitoring device is a water level sensor.

[0050] Embodiment two

[0051] As shown in Figure 2 Embodiment two of the present application provides a method for cooling a generator in a dock, which specifically comprises:

[0052] S100, pumping seawater to the first ballast tank 14 and the second ballast tank 15.

[0053] S200, starting the generator to test the generator.

[0054] S300, determining the number of generators in use in the first tail pump cabin 11. If all the generators in the first tail pump cabin 11 are in use, seawater is pumped to the first cooler 111 through the first branch pipe 21, and seawater in the first ballast tank 14 is pumped to the first cooler 111.

[0055] S400, determining the number of generators in use in the second tail pump cabin 12. If all the generators in the second tail pump cabin 12 are in use, seawater is pumped to the second cooler 121 through the first branch pipe 21, and seawater is pumped to the second cooler 121 through the second branch pipe 22.

[0056] S500, determining the number of generators in use in the third tail pump cabin 13. If all the generators in the third tail pump cabin 13 are in use, seawater is pumped to the third cooler 131 through the second branch pipe 22, and seawater in the second ballast tank 15 is pumped to the third cooler 131.

[0057] In detail, before the generator test, first, a certain amount of seawater is stored by the first ballast tank 14 and the second ballast tank 15. In operation, first, the working condition of the generator is determined. When both of the two generators in the first tail pump cabin 11 are turned on, the seawater of the fire-fighting seawater main pipe 2 is pumped to the first cooler 111 by the first branch pipe 21, and at the same time, the seawater in the first ballast tank 14 is pumped to the first cooler 111, so as to meet the cooling requirement when both of the two generators in the first tail pump cabin 11 work at the same time. Similarly, when both of the two generators in the third tail pump cabin 13 are turned on, the seawater of the fire-fighting seawater main pipe 2 is pumped to the third cooler 131 by the second branch pipe 22, and at the same time, the seawater in the second ballast tank 15 is pumped to the third cooler 131, so as to meet the cooling requirement when both of the two generators in the third tail pump cabin 13 work at the same time. When both of the two generators in the second tail pump cabin 12 are turned on, the seawater is pumped to the second cooler 121 by the first branch pipe 21 and the second branch pipe 22 at the same time, so as to meet the cooling requirement when both of the two generators in the second tail pump cabin 12 work at the same time. Thus, the ship generator cooling method provided by the embodiment can meet the cooling requirement when six generators work at the same time by using the first ballast tank 14, the second ballast tank 15 and the fire-fighting seawater main pipe 2 to provide cooling seawater for the generators.

[0058] Specifically, determining the number of generators in the first tail pump cabin 11 includes the following steps: if one generator in the first tail pump cabin 11 is turned on, the seawater is pumped to the first cooler 111 by the first branch pipe 21, and the communication between the first ballast tank 14 and the first cooler 111 is disconnected.

[0059] Thus, the situation that the first branch pipe 21 and the first ballast tank 14 provide cooling seawater to the first cooler 111 at the same time when one generator in the first tail pump cabin 11 is turned on can be avoided.

[0060] Further, if one generator in the first tail pump cabin 11 is turned on, the seawater is pumped to the first cooler 111 by the first branch pipe 21 after the communication between the first ballast tank 14 and the first cooler 111 is disconnected, and the following steps are further included: the temperature of the first cooler 111 is monitored in real time, and it is determined whether the temperature of the first cooler 111 is greater than a first set temperature range. If yes, the seawater in the first ballast tank 14 is pumped to the first cooler 111.

[0061] In this way, if the first branch pipe 21 is blocked or leaks, the seawater of the first cooler 111 is insufficient, and the generator cannot be effectively cooled. At this time, the seawater in the first ballast tank 14 is pumped to the first cooler 111, so as to ensure that the test of the generator can be carried out normally.

[0062] Specifically, the step of judging the number of the generators in the third tail pump room 13 further comprises the following steps: if one generator in the third tail pump room 13 is in use, pumping seawater to the third cooler 131 through the second branch pipe 22, and disconnecting the communication between the second ballast room 15 and the third cooler 131. Thus, the situation that the first branch pipe 21 and the second branch pipe 22 simultaneously provide cooling seawater to the second cooler 121 when one generator in the second tail pump room 12 is in use can be avoided.

[0063] Further, if one generator in the third tail pump room 13 is in use, after pumping seawater to the third cooler 131 through the second branch pipe 22 and disconnecting the communication between the second ballast room 15 and the third cooler 131, the method further comprises the following steps: monitoring the temperature of the third cooler 131 in real time, judging whether the temperature of the third cooler 131 is greater than the second set temperature range, if yes, pumping the seawater in the second ballast room 15 to the third cooler 131.

[0064] In this way, if the third cooler 131 is short of seawater due to the blockage or leakage of the second branch pipe 22, the generator cannot be effectively cooled, at this time, the seawater in the second ballast room 15 is pumped to the third cooler 131, thereby ensuring that the test of the generator can be carried out normally.

[0065] Specifically, the step of judging the number of the generators in the second tail pump room 12 further comprises the following steps: if one generator in the second tail pump room 12 is in use, pumping seawater to the second cooler 121 through the first branch pipe 21, and disconnecting the communication between the second branch pipe 22 and the second cooler 121. Alternatively, pumping seawater to the cooler through the second branch pipe 22, and disconnecting the communication between the first branch pipe 21 and the second cooler 121. Thus, the situation that the first branch pipe 21 and the second branch pipe 22 simultaneously provide cooling seawater to the second cooler 121 when one generator in the second tail pump room 12 is in use can be avoided.

[0066] Further, if one generator in the second tail pump room 12 is in use, after pumping seawater to the second cooler 121 through the first branch pipe 21 and disconnecting the communication between the second branch pipe 22 and the second cooler 121, the method further comprises the following steps: monitoring the temperature of the second cooler 121 in real time, judging whether the temperature of the second cooler 121 is greater than the third set temperature range, if yes, pumping seawater to the second cooler 121 through the second branch pipe 22. Alternatively, monitoring the temperature of the second cooler 121 in real time, judging whether the temperature of the second cooler 121 is greater than the third set temperature range, if yes, pumping seawater to the second cooler 121 through the first branch pipe 21.

[0067] In this way, if the first branch pipe 21 or the second branch pipe 22 is blocked or leaks, resulting in insufficient seawater for the second cooler 121, the generator cannot be effectively cooled. At this time, seawater is pumped to the second cooler 121 through the second branch pipe 22 or the first branch pipe 21, thereby ensuring that the generator test can be carried out normally.

[0068] In detail, the first cooler 111, the second cooler 121, and the third cooler 131 are each provided with a temperature sensor for monitoring the water temperature of the first cooler 111, the second cooler 121, and the third cooler 131. It should be noted that the first set temperature range, the second set temperature range, and the third set temperature range need to be set according to the actual parameters of the generator, and are not limited herein.

[0069] Specifically, the ship dock generator cooling method further comprises: monitoring the water level of the first ballast tank 14 and the second ballast tank 15 in real time, if the water level of the first ballast tank 14 is greater than the first set water level, stopping pumping seawater into the first ballast tank 14, if the water level in the second ballast tank 15 is greater than the second set water level, stopping pumping seawater into the second ballast tank 15. In this way, the amount of seawater injected into the first ballast tank 14 and the second ballast tank 15 can be more conveniently controlled. In detail, the first set water level and the second set water level are the same, and the specific parameters of the first set water level and the second set water level need to be set according to the actual test requirements.

[0070] Specifically, after starting the generator and performing the generator test, the following steps are further included: the heat exchange waste water of the first cooler 111, the second cooler 121, and the third cooler 131 is discharged to the dock bottom; the water level of the dock bottom is monitored in real time, and if the water level of the dock bottom is higher than the set safety height, the submersible pump is controlled to discharge the waste water of the dock bottom to the outside of the dock. In detail, during the generator test, the waste water of the first cooler 111, the second cooler 121, and the third cooler 131 is continuously discharged to the dock bottom through the pipeline to ensure that seawater can be continuously pumped to the first cooler 111, the second cooler 121, and the third cooler 131 for heat exchange. The water level of the dock bottom is monitored in real time, and when the water level of the waste water in the dock bottom is higher than the set safety height, the submersible pump is used to pump it out to the outside of the dock to ensure the safety of the ship and the equipment. In detail, the set safety height needs to be set according to the actual parameters of the ship.

[0071] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method of cooling generators in a ship dock, the ship comprising a first stern pump room (11), a second stern pump room (12) and a third stern pump room (13) spaced apart in the direction of the width of the ship, each of the first stern pump room (11), the second stern pump room (12) and the third stern pump room (13) being provided with two generators, the ship further comprising a first ballast tank (14) and a second ballast tank (15) spaced apart in the direction of the width of the ship, characterized in that, The fire-fighting sea water main (2) is communicated with a first branch pipe (21) and a second branch pipe (22), the first branch pipe (21) and the second branch pipe (22) both extend to a tail pump cabin of the ship, a first cooler (111) in a first tail pump cabin (11) is communicated with the first branch pipe (21) through a pipeline, a second cooler (121) in a second tail pump cabin (12) is communicated with the first branch pipe (21) through a pipeline, the second cooler (121) in the second tail pump cabin (12) is also communicated with the second branch pipe (22) through a pipeline, a third cooler (131) in a third tail pump cabin (13) is communicated with the second branch pipe (22) through a pipeline, the first ballast tank (14) is communicated with the first branch pipe (21) through a pipeline, the first ballast tank (14) is also communicated with the first cooler (111) through a pipeline, the second ballast tank (15) is communicated with the second branch pipe (22) through a pipeline, the second ballast tank (15) is also communicated with the third cooler (131) through a pipeline; the ship dock generator cooling method comprises: Pumping sea water to the first ballast tank (14) and the second ballast tank (15); Starting a generator and performing a generator test; Judging a generator start-up number of the first tail pump cabin (11), if all the generators of the first tail pump cabin (11) are started up, pumping sea water to the first cooler (111) through the first branch pipe (21), and pumping sea water of the first ballast tank (14) to the first cooler (111); Judging a generator start-up number of the second tail pump cabin (12), if all the generators of the second tail pump cabin (12) are started up, pumping sea water to the second cooler (121) through the first branch pipe (21), and pumping sea water to the second cooler (121) through the second branch pipe (22); Judging a generator start-up number of the third tail pump cabin (13), if all the generators of the third tail pump cabin (13) are started up, pumping sea water to the third cooler (131) through the second branch pipe (22), and pumping sea water of the second ballast tank (15) to the third cooler (131).

2. A method of cooling an in-dock ship generator as claimed in claim 1, wherein, The step of judging the generator start-up number of the first tail pump cabin (11) further comprises the following steps: If one generator of the first tail pump cabin (11) is started up, pumping sea water to the first cooler (111) through the first branch pipe (21), and disconnecting the first ballast tank (14) and the first cooler (111).

3. A method of cooling an in-dock ship generator as claimed in claim 2, wherein, The step of pumping sea water to the first cooler (111) through the first branch pipe (21) and disconnecting the first ballast tank (14) and the first cooler (111) further comprises the following steps: Real-time monitoring of the temperature of the first cooler (111), to determine whether the temperature of the first cooler (111) is greater than the first set temperature range, if yes, the sea water in the first ballast tank (14) is pumped to the first cooler (111).

4. A method of cooling an in-dock marine generator as claimed in claim 1, wherein, The determination of the number of generators enabled in the third tail pump cabin (13) further comprises the following steps: If the generator of the third tail pump cabin (13) is enabled, the sea water is pumped to the third cooler (131) through the second branch pipe (22), and the communication between the second ballast tank (15) and the third cooler (131) is disconnected.

5. A method of cooling an in-dock ship generator as claimed in claim 4, wherein, After pumping sea water to the third cooler (131) through the second branch pipe (22) and disconnecting the communication between the second ballast tank (15) and the third cooler (131), the method further comprises the following steps: Real-time monitoring of the temperature of the third cooler (131), to determine whether the temperature of the third cooler (131) is greater than the second set temperature range, if yes, the sea water in the second ballast tank (15) is pumped to the third cooler (131).

6. A method of cooling an in-dock marine generator as claimed in claim 1, wherein, The determination of the number of generators enabled in the second tail pump cabin (12) further comprises the following steps: If the generator of the second tail pump cabin (12) is enabled, the sea water is pumped to the second cooler (121) through the first branch pipe (21), and the communication between the second branch pipe (22) and the second cooler (121) is disconnected.

7. A method of cooling an in-dock ship generator as claimed in claim 6, wherein, After pumping sea water to the second cooler (121) through the first branch pipe (21) and disconnecting the communication between the second branch pipe (22) and the second cooler (121), the method further comprises the following steps: Real-time monitoring of the temperature of the second cooler (121), to determine whether the temperature of the second cooler (121) is greater than the third set temperature range, if yes, the sea water is pumped to the second cooler (121) through the second branch pipe (22).

8. A method of cooling an in-dock ship generator as claimed in claim 1, wherein said first ballast tank (14) and said second ballast tank (15) are each fitted with a liquid level monitoring device, characterized in that, The ship dock generator cooling method further comprises: Real-time monitoring of the water level height of the first ballast tank (14) and the second ballast tank (15), if the water level height of the first ballast tank (14) is greater than the first set water level height, stopping pumping sea water into the first ballast tank (14), if the water level height in the second ballast tank (15) is greater than the second set water level height, stopping pumping sea water into the second ballast tank (15).

9. The method of claim 1, wherein the first stern pump room (11), the second stern pump room (12) and the third stern pump room (13) are each provided with a drain, the first cooler (111) is connected to the drain of the first stern pump room (11) by a pipe, the second cooler (121) is connected to the drain of the second stern pump room (12) by a pipe, the third cooler (131) is connected to the drain of the third stern pump room (13) by a pipe, a water level monitoring device is installed on the dock bottom, and a submersible pump is installed on the dock bottom and used to pump seawater in the dock to outside the dock. Starting the generator and conducting the generator test further comprises the following steps: The heat exchange waste water of the first cooler (111), the second cooler (121) and the third cooler (131) is discharged to the dock bottom; Real-time monitoring of the water level height of the dock bottom, if the water level height of the dock bottom is higher than the set safety height, controlling the submersible pump to discharge the waste water of the dock bottom to outside the dock.

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