CN112855387A

CN112855387A - Ship and marine LNG cold energy recovery system thereof

Info

Publication number: CN112855387A
Application number: CN201911183906.0A
Authority: CN
Inventors: 罗哲; 蒋孙建; 尹辉; 于海东; 李国华
Original assignee: Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Current assignee: Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2021-05-28

Abstract

The invention provides a ship and a marine LNG cold energy recovery system thereof. The tank body is used for storing liquid LNG. The engine is located on one side of the tank and is configured to receive gaseous LNG vaporized from the liquid LNG. Vaporization system includes first pipeline and first vaporizer, the both ends intercommunication jar liquid outlet of the body and the air inlet of engine of first pipeline, first vaporizer is installed on first pipeline for the liquid LNG of vaporization, first vaporizer vaporizes liquid LNG, and produce a large amount of cold energy, and cold energy recovery system and the heat exchange of first vaporizer, take away and utilize the cold energy by the release of first vaporizer, thereby the realization is by cold energy recovery system make full use of the cold energy of first vaporizer release, and improve the utilization ratio of cold energy.

Description

Ship and marine LNG cold energy recovery system thereof

Technical Field

The invention relates to the technical field of ships, in particular to a ship and a marine LNG cold energy recovery system thereof.

Background

Liquefied Natural Gas (LNG) is used as a new ship energy source, has the advantages of low carbon, environmental protection, economy and the like, and gradually forms a natural gas ship power industry chain, and at present, ships realize marine transportation under the energy supply of the Liquefied Natural Gas (LNG).

With the development of ships powered by Liquefied Natural Gas (LNG) in domestic fishery, a living room and a refrigerating chamber are arranged in the ships, the living room is mainly convenient for operators to live and the refrigerating chamber is mainly used for freezing and refreshing food.

In the related art, Liquefied Natural Gas (LNG) is stored in a ship as a liquid state and is supplied to the ship after being vaporized, however, the Liquefied Natural Gas (LNG) releases cold energy when being vaporized, and the cold energy is discharged outside the ship and is not effectively utilized, resulting in a low utilization rate of the cold energy.

Disclosure of Invention

The invention aims to provide a ship and a marine LNG cold energy recovery system thereof, and solves the problem that the utilization rate of cold energy released by liquefied natural gas through vaporization is low in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

according to one aspect of the present invention, there is provided a marine LNG cold energy recovery system comprising: the tank body is used for storing liquid LNG; the engine is positioned on one side of the tank body; the engine is configured to receive the gaseous LNG vaporized from the liquid LNG; a vaporization system comprising a first conduit and a first vaporizer; two ends of the first pipeline are communicated with the liquid outlet of the tank body and the air inlet of the engine; the first vaporizer is installed on the first pipeline to vaporize the liquid LNG; and the cold energy recovery system exchanges heat with the first vaporizer, and takes away and utilizes the cold energy released by the first vaporizer.

Optionally, the cold energy recovery system includes: the cold energy release device is used for releasing the cold energy; the first loop pipeline is communicated with the first vaporizer and the cold energy release device and forms a first closed loop together; the refrigerant reservoir is arranged on the first loop pipeline and used for providing a first refrigerant, and the first refrigerant circulates on the first closed loop and exchanges heat with the first vaporizer; and the driving pump is arranged on the first loop pipeline to provide power for the first refrigerant to circularly flow in the first closed loop.

Optionally, the cold energy recovery system further comprises: the first temperature detector is arranged corresponding to the cold energy release device; the first temperature detector is used for detecting the temperature of the cold energy release device; two ends of the second pipeline are communicated with the first loop pipeline, and two ends of the second pipeline are respectively connected with two sides of the cold energy release device; the first reversing valve is positioned at the communication position of the second pipeline and the first loop pipeline and is positioned on one side facing to the inlet end of the cold energy release device; the first reversing valve is provided with two first channels which are respectively communicated with the first loop pipeline and the second pipeline; the first reversing valve is electrically connected with the first temperature detector and controls the conduction of the cold energy release device and the second pipeline according to the first temperature detector.

Optionally, the cold energy releasing device, the second pipeline, the first reversing valve and the first temperature detector are all provided with a plurality of cold energy releasing devices, and the cold energy releasing devices, the second pipeline, the first reversing valve and the first temperature detector correspond to one another.

Optionally, the first refrigerant is a calcium chloride solution.

Optionally, the vaporization systems have multiple groups, and the multiple groups of vaporization systems are arranged at intervals.

Optionally, the marine LNG cold energy recovery system further includes: a second vaporizer mounted on the first pipe and located between the first vaporizer and the engine; and a second loop pipeline which is communicated with the second vaporizer and the engine and forms a second closed loop together, wherein the second closed loop is used for a second refrigerant contained in the engine to flow, so that the second refrigerant and the second vaporizer exchange heat.

Optionally, a second temperature detector is arranged on the second stage vaporizer, and the second temperature detector is used for detecting the temperature of the second stage vaporizer; a third pipeline and a second reversing valve are arranged on the second loop pipeline; two ends of the third pipeline are communicated with the second loop pipeline, and two ends of the third pipeline are respectively connected with two sides of the second-stage vaporizer; the second reversing valve is positioned at the communication position of the third pipeline and the second loop pipeline and is positioned at one side facing the inlet end of the second-stage carburetor; the second reversing valve is provided with two second channels which are respectively communicated with the second loop pipeline and the third pipeline; the second reversing valve is electrically connected with the second temperature detector and controls the conduction of the second-stage carburetor and the third pipeline according to the second temperature detector.

Optionally, the marine LNG cold energy recovery system further includes: a third loop pipeline, two ends of which are communicated with the liquid outlet and the air inlet of the tank body; and a third vaporizer mounted on the third loop conduit; the third vaporizer is configured to vaporize the liquid LNG discharged from the liquid outlet, so that the gaseous LNG vaporized from the liquid LNG enters the tank through the gas inlet, thereby pressurizing the tank.

According to another aspect of the invention, the invention also provides a ship comprising any one of the marine LNG cold energy recovery systems described above.

According to the technical scheme, the invention has at least the following advantages and positive effects:

in the marine LNG cold energy recovery system according to the embodiment of the present invention, two ends of a first pipeline communicate a liquid outlet of a tank and an air inlet of an engine, a first vaporizer is installed on the first pipeline and used for vaporizing liquid LNG, the first vaporizer vaporizes the liquid LNG and generates a large amount of cold energy, and the cold energy recovery system exchanges heat with the first vaporizer to take away and utilize the cold energy released by the first vaporizer, thereby achieving that the cold energy released by the first vaporizer is fully utilized by the cold energy recovery system and improving the utilization rate of the cold energy.

Drawings

Fig. 1 is a connection diagram of the marine LNG cold energy recovery system of the present invention.

Fig. 2 is a connection diagram of the vaporization system of the marine LNG cold energy recovery system of the present invention.

Fig. 3 is a connection diagram of a cold energy recovery system of the marine LNG cold energy recovery system according to the present invention.

Fig. 4 is a connection diagram of a pressurization system of the marine LNG cold energy recovery system according to the present invention.

The reference numerals are explained below:

100. a marine LNG cold energy recovery system;

1. a tank body; 11. a liquid outlet; 12. a first air inlet;

2. an engine; 21. a second air inlet; 22. a water inlet; 23. a water outlet;

3. a vaporization system; 31. a first conduit; 32. a first vaporizer; 33. a second vaporizer; 34. a fourth conduit; 35. a third directional control valve;

4. a cold energy recovery system; 4a, a first closed loop; 41. a cold energy release device; 42. a first loop conduit; 43. a refrigerant reservoir; 44. driving the pump; 45. a first temperature detector; 46. a second conduit; 47. a first direction changing valve; 48. a one-way valve;

5. a second loop conduit; 5a, a second closed loop;

6. a second temperature detector;

7. a third pipeline;

8. a second directional control valve;

9. a pressurization system; 9a, a third closed loop; 91. a third loop conduit; 93. a third vaporizer.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

Referring to fig. 1, the present invention provides a marine LNG cold energy recovery system 100 and a ship having the same 100. The boats and ships have Liquefied Natural Gas (LNG), and this Liquefied Natural Gas (LNG) need just can supply boats and ships to use after the vaporization, and wherein, Liquefied Natural Gas (LNG) releases cold energy when the vaporization and is driven and utilize by marine LNG cold energy recovery system 100, and is optional, and marine LNG cold energy recovery system 100 can carry the cold energy to the device that corresponds on the boats and ships. The corresponding devices are living room and refrigerating room, which is not limited here.

The marine LNG cold energy recovery system 100 according to the present invention is generally installed in a ship, and the marine LNG cold energy recovery system 100 mainly includes a tank 1, an engine 2, a vaporization system 3, and a cold energy recovery system 4. The engine 2 is positioned at one side of the tank body 1, and a vaporization system 3, a cold energy recovery system 4 and a pressurization system 9 are arranged between the tank body 1 and the engine 2.

Referring to fig. 2, the tank 1 is mainly used for storing liquid LNG and protecting the liquid LNG from the outside. The tank body 1 can be an LNG storage tank.

The tank 1 has a plurality of liquid outlets 11 and a first gas inlet 12, wherein the liquid LNG is discharged from the tank 1 along the liquid outlets 11, and the gas can be introduced into the tank 1 along the first gas inlet 12.

The engine 2 is located at the right side of the tank 1, and the engine 2 is configured to receive the gaseous LNG vaporized from the liquid LNG and to use the gaseous LNG to power the ship.

The engine 2 is provided with a second intake port 21, and the second intake port 21 is mainly used for receiving gaseous LNG which enters the engine 2 along the second intake port 21.

The engine 2 is provided with a water inlet 22 and a water outlet 23, and the water inlet 22 and the water outlet 23 are arranged at intervals with the second air inlet 21.

Wherein the water outlet 23 communicates with the water inlet 22, and cooling water for cooling the engine 2 can circulate in the water inlet 22 and the water outlet 23. The operating temperature of the engine 2 is prevented from being excessively high by the heat exchange with the engine 2 by the cooling water that absorbs the heat emitted from the engine 2.

The vaporization system 3 includes a first pipe 31, a first vaporizer 32, and a second vaporizer 33, and the first pipe 31, the first vaporizer 32, and the second vaporizer 33 are located between the tank 1 and the engine 2 and are communicated with each other.

Two ends of the first pipeline 31 are communicated with the corresponding liquid outlet 11 of the tank 1 and the second air inlet 21 of the engine 2, and the first pipeline 31 is used as a pipeline between the tank 1 and the engine 2 and can supply liquid and convey gaseous LNG.

The first vaporizer 32 and the second vaporizer 33 both function to vaporize the liquid LNG, which releases a large amount of cold energy upon vaporization.

The first vaporizer 32 and the second vaporizer 33 are both installed on the first pipeline 31 and sequentially arranged in the direction from the tank 1 to the engine 2, and the first vaporizer 32 and the second vaporizer 33 sequentially perform two-stage vaporization on the liquid LNG, thereby further improving the quality of the gaseous LNG and enabling the gaseous LNG to be better utilized by the engine 2.

The first vaporizer 32 vaporizes the liquid LNG for the first time, and the liquid LNG is vaporized in the first vaporizer 32 to generate a large amount of cold energy, which can be taken away and utilized by the cold energy recovery system 4, so that the cold energy released by the first vaporizer 32 is sufficiently utilized by the cold energy recovery system 4, and the utilization rate of the cold energy is improved.

In addition, since the fourth pipe 34 is connected to both sides of the first vaporizer 32 and both ends of the fourth pipe 34 are communicated with the first pipe 31, the fourth pipe 34 is communicated with the first pipe 31 while avoiding the first vaporizer 32, so that the liquid LNG flowing into the first pipe 31 cannot pass through the first vaporizer 32.

A third reversing valve 35 is arranged at the joint of the fourth pipeline 34 and the first pipeline 31, the third reversing valve 35 is arranged at one side facing the inlet end of the first vaporizer 32, and two third channels are arranged on the third reversing valve 35 and are respectively communicated with the first loop pipeline 42 and the second pipeline 46, that is, the liquid LNG can flow to the first pipeline 31 or the fourth pipeline 34 through the third reversing valve 35.

While the liquid LNG can flow to the fourth pipeline 34 through the third direction changing valve 35, the liquid LNG flows to the second vaporizer 33 while bypassing the first vaporizer 32.

While the liquid LNG can flow to the first pipe 31 through the third direction changing valve 35, the liquid LNG flows to the first vaporizer 32 and is vaporized at the first vaporizer 32 to generate a large amount of cold energy, which is taken away and utilized by the cold energy recovery system 4.

Referring to fig. 3, the cold energy recovery system 4 exchanges heat with the first vaporizer 32, and takes away and utilizes cold energy released from the first vaporizer 32. The cold energy recovery system 4 includes a cold energy releasing device 41, a first loop pipe 42, a refrigerant reservoir 43 and a driving pump 44, the first loop pipe 42 may be formed by connecting a plurality of pipes, communicates the first vaporizer 32 and the cold energy releasing device 41, and together form a first closed loop 4a, and the first closed loop 4a may be an annular loop.

When the first vaporizer 32 is provided in plurality, the plurality of first vaporizers 32 are collected and communicated with the first loop pipe 42, so that the cold energy released by the plurality of first vaporizers 32 can be uniformly processed.

The refrigerant reservoir 43 is disposed on the first loop pipe 42 and on the first closed loop 4 a. The refrigerant reservoir 43 stores a large amount of the first refrigerant and can replenish the first refrigerant.

The refrigerant reservoir 43 is configured to provide a first refrigerant, which circulates on the first closed loop 4a and exchanges heat with the first vaporizer 32, and optionally, the first refrigerant contacts the first vaporizer 32 to exchange heat.

The first refrigerant is a calcium chloride solution, and the calcium chloride solution flows in the first loop pipe 42 independently, so that the first refrigerant and other refrigerants are prevented from being mixed.

The calcium chloride solution can reduce the freezing point of the first loop pipeline 42, effectively prevent the refrigerant from freezing after absorbing cold energy, and avoid the refrigerant from freezing the first loop pipeline 42. The first loop pipe 42 is made of an anticorrosive material, and can prevent corrosion of the calcium chloride solution.

A drive pump 44 is disposed on the first loop conduit 42 and on the first closed loop 4 a. The drive pump 44 may alternatively be a dual pump drive pump.

The driving pump 44 is used as a power component of the cold energy recovery system 4, and provides power for the first refrigerant to flow in the first closed loop 4a in a circulating manner, and the first refrigerant can flow in the first closed loop 4a in a circulating manner under the driving of the driving pump 44, so that the cold energy released from the first vaporizer 32 is delivered to the cold energy releasing device 41.

The cold energy releasing device 41 is used for releasing the cold energy released from the first vaporizer 32, and the temperature of the cold energy releasing device 41 is adjusted by the cold energy, so that the cold energy is fully utilized. Specifically, the cold energy releasing device 41 may be a living room, a refrigerating chamber or a fishing cabin, which is not limited herein.

The cold energy releasing device 41 is correspondingly provided with a first temperature detector 45, the first temperature detector 45 is used for detecting the temperature of the cold energy releasing device 41, and optionally, the first temperature detector 45 is installed on the inner wall of the cold energy releasing device 41. The first temperature detector 45 may be a temperature sensor.

The two sides of the cold energy releasing device 41 are connected with second pipelines 46, and two ends of the second pipelines 46 are communicated with the first loop pipeline 42, so that the second pipelines 46 avoid the cold energy releasing device 41 and are communicated with the first loop pipeline 42, and the first refrigerant flowing to the second pipelines 46 cannot pass through the cold energy releasing device 41.

A first direction valve 47 is arranged at a communication position of the second pipeline 46 and the first loop pipeline 42, the first direction valve 47 is positioned at one side facing the inlet end of the cold energy releasing device 41, two first channels are arranged on the first direction valve 47, the two first channels are respectively communicated with the first loop pipeline 42 and the second pipeline 46, namely, the first refrigerant can flow to the first loop pipeline 42 or the second pipeline 46 through the first direction valve 47.

In addition, the first direction valve 47 is electrically connected to the first temperature detector 45, and controls the conduction of the cold energy releasing device 41 and the second pipeline 46 according to the first temperature detector 45.

When the temperature detected by the first temperature detector 45 is normal, the first direction valve 47 is connected to the second pipeline 46, so that the first refrigerant flows to the second pipeline 46 through the first direction valve 47, and at this time, the cold energy carried by the first refrigerant is not utilized by the cold energy releasing device 41.

When the temperature detected by the first temperature detector 45 is abnormal, the first reversing valve 47 is communicated with the first loop pipeline 42, so that the first refrigerant flows to the cold energy release device 41 through the first reversing valve 47, and at this time, the cold energy carried by the first refrigerant is conveyed to the cold energy release device 41 and is utilized by the cold energy release device 41.

The first loop pipe 42 is provided with a check valve 48, and the check valve 48 controls the flow direction of the first refrigerant, so that the first refrigerant flows clockwise in a single direction, and the first refrigerant can conveniently pass through the first reversing valve 47 to select the cold energy release device 41 and the second pipe 46.

Wherein, a group of control components of the cold energy releasing device 41 is formed by the second pipeline 46, the first reversing valve 47 and the first temperature detector 45, and the group of control components is correspondingly arranged relative to the cold energy releasing device 41, so that the group of control components can independently control a corresponding cold energy releasing device 41. When there are a plurality of cold energy discharging devices 41, the control components do not interfere with each other. The utilization rate of the cold energy is further improved by better utilizing the cold energy through the plurality of cold energy releasing devices 41 and the corresponding control components.

The second vaporizer 33 in the vaporization system 3 is located between the first vaporizer 32 and the engine 2. The second vaporizer 33 serves to further vaporize the LNG vaporized by the first vaporizer 32, so that the gaseous LNG is more sufficiently vaporized, the presence of liquid LNG is avoided, and the service life of the engine 2 is improved.

The second vaporizer 33 is provided with a second temperature detector 6, and the second temperature detector 6 is used for detecting the temperature of the second vaporizer 33. Optionally, the second temperature detector 6 is mounted on the inner wall of the second vaporizer 33. The second temperature detector 6 may be a temperature sensor.

A second loop pipeline 5 is connected between the second vaporizer 33 and the engine 2, the second loop pipeline 5 is communicated with the second vaporizer 33 and the water inlet 22 and the water outlet 23 of the engine 2, and forms a second closed loop 5a together, the second closed loop 5a is used for flowing a second refrigerant contained in the engine 2, so that the second refrigerant exchanges heat 33 with the second vaporizer, and at this time, the second refrigerant is cooling water for cooling the engine 2, and the cooling water absorbs heat emitted by the engine 2.

The second refrigerant flows in the second closed loop 5a, and the first refrigerant flows in the first closed loop 4a, wherein the first closed loop 4a and the second closed loop 5a are separated from each other, so that the first refrigerant and the second refrigerant are mutually independent, and the first refrigerant and the second refrigerant are prevented from being mixed.

The cooling water absorbing the heat emitted from the engine 2 contacts the second vaporizer 33 and exchanges heat, so that the vaporized LNG vaporized by the second vaporizer 33 is returned to the temperature to maintain a normal state.

The second loop pipeline 5 is provided with a third pipeline 7, two ends of the third pipeline 7 are communicated with the second loop pipeline 5, and two ends of the third pipeline 7 are respectively connected with two sides of the second vaporizer 33, so that the third pipeline 7 avoids the second vaporizer 33 and is communicated with the second loop pipeline 5, and the second refrigerant flowing to the third pipeline 7 cannot pass through the second vaporizer 33.

A second direction valve 8 is arranged at the communication part of the third pipeline 7 and the second loop pipeline 5, and the second direction valve 8 is arranged at one side facing to the inlet end of the second vaporizer 33. The second reversing valve 8 is provided with two second channels, and the two second channels are respectively communicated with the second loop pipeline 5 and the third pipeline 7, namely, the second refrigerant can flow to the second loop pipeline 5 or the third pipeline 7 through the second reversing valve 8.

In addition, the second direction valve 8 is electrically connected with the second temperature detector 6, and controls the conduction of the second vaporizer 33 and the third pipeline 7 according to the second temperature detector 6.

When the temperature detected by the second temperature detector 6 is normal, the second reversing valve 8 is communicated with the third pipeline 7, so that the second refrigerant flows to the third pipeline 7 through the second reversing valve 8, and at this time, the cold energy carried by the second refrigerant is not utilized by the second vaporizer 33.

When the temperature detected by the second temperature detector 6 is abnormal, the second reversing valve 8 is communicated with the second loop pipeline 5, so that the second refrigerant flows to the second vaporizer 33 through the second reversing valve 8, at this time, the cold energy carried by the second refrigerant is transmitted to the second vaporizer 33, so that the second vaporizer 33 absorbs the heat on the cooling water, and the normal temperature of the gaseous LNG in the second vaporizer 33 is maintained.

Referring to fig. 4, the LNG cold energy recovery system 100 for a ship further includes a pressurization system 9, and the pressurization system 9 acts on the tank body 1. The pressurization system 9 comprises a third loop pipeline 91 and a third vaporizer 92, two ends of the third loop pipeline 91 are communicated with the liquid outlet 11 and the first air inlet 12 of the tank body 1, and the third loop pipeline 91 is provided with the third vaporizer 92 to form a third closed loop 9a together.

The third vaporizer 92 is configured to vaporize the liquid LNG discharged from the liquid outlet 11, and to introduce the gaseous LNG vaporized from the liquid LNG into the tank 1 through the first gas inlet 12, so as to pressurize the tank 1. By converting the liquid LNG into a large amount of gaseous LNG under the action of the third vaporizer 92, the large amount of gaseous LNG is filled in the tank 1, so that the gas pressure of the tank 1 is maintained at a normal level.

in the marine LNG cold energy recovery system 100 according to the embodiment of the present invention, two ends of a first pipeline 31 communicate with a liquid outlet 11 of the tank 1 and a second air inlet 21 of the engine 2, a first vaporizer 32 is installed on the first pipeline 31 and is configured to vaporize the liquid LNG, the first vaporizer 32 vaporizes the liquid LNG and generates a large amount of cold energy, and the cold energy recovery system 4 exchanges heat with the first vaporizer 32 to take away and utilize the cold energy released by the first vaporizer 32, so that the cold energy released by the first vaporizer 32 is fully utilized by the cold energy recovery system 4, and the utilization rate of the cold energy is improved.

The second vaporizer 33 serves to further vaporize the LNG vaporized by the first vaporizer 32, so that the gaseous LNG is more sufficiently vaporized, the presence of liquid LNG is avoided, and the service life of the engine 2 is improved.

The first refrigerant flows in the first closed loop 4a, wherein the first closed loop 4a and the second closed loop 5a are spaced from each other, so that mutual independence of the first refrigerant and the second refrigerant is realized, and the first refrigerant and the second refrigerant are prevented from being mixed.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A marine LNG cold energy recovery system, comprising:

the tank body is used for storing liquid LNG;

the engine is positioned on one side of the tank body; the engine is configured to receive the gaseous LNG vaporized from the liquid LNG;

a vaporization system comprising a first conduit and a first vaporizer; two ends of the first pipeline are communicated with the liquid outlet of the tank body and the air inlet of the engine; the first vaporizer is installed on the first pipeline to vaporize the liquid LNG; and

and the cold energy recovery system exchanges heat with the first vaporizer, and takes away and utilizes the cold energy released by the first vaporizer.

2. The marine LNG cold energy recovery system of claim 1, wherein the cold energy recovery system comprises:

the cold energy release device is used for releasing the cold energy;

the first loop pipeline is communicated with the first vaporizer and the cold energy release device and forms a first closed loop together;

the refrigerant reservoir is arranged on the first loop pipeline and used for providing a first refrigerant, and the first refrigerant circulates on the first closed loop and exchanges heat with the first vaporizer; and

and the driving pump is arranged on the first loop pipeline to provide power for the first refrigerant to circularly flow in the first closed loop.

3. The marine LNG cold energy recovery system of claim 2, further comprising:

the first temperature detector is arranged corresponding to the cold energy release device; the first temperature detector is used for detecting the temperature of the cold energy release device;

two ends of the second pipeline are communicated with the first loop pipeline, and two ends of the second pipeline are respectively connected with two sides of the cold energy release device; and

a first reversing valve located at the communication of the second pipeline and the first loop pipeline and on the side facing the inlet end of the cold energy release device; the first reversing valve is provided with two first channels which are respectively communicated with the first loop pipeline and the second pipeline; the first reversing valve is electrically connected with the first temperature detector and controls the conduction of the cold energy release device and the second pipeline according to the first temperature detector.

4. The marine LNG cold energy recovery system of claim 3, wherein the cold energy release device, the second pipeline, the first reversing valve and the first temperature detector are provided in plurality and in one-to-one correspondence.

5. The marine LNG cold energy recovery system of claim 2, wherein the first refrigerant is a calcium chloride solution.

6. The marine LNG cold energy recovery system of claim 1, wherein the vaporization systems have a plurality of sets, the plurality of sets being spaced apart.

7. The marine LNG cold energy recovery system of claim 2, further comprising:

a second vaporizer mounted on the first pipe and located between the first vaporizer and the engine; and

and a second loop pipeline which is communicated with the second vaporizer and the engine and forms a second closed loop together, wherein the second closed loop is used for a second refrigerant contained in the engine to flow, so that the second refrigerant and the second vaporizer exchange heat.

8. The marine LNG cold energy recovery system of claim 7, wherein a second temperature detector is provided on the second stage vaporizer for detecting the temperature of the second stage vaporizer;

a third pipeline and a second reversing valve are arranged on the second loop pipeline;

two ends of the third pipeline are communicated with the second loop pipeline, and two ends of the third pipeline are respectively connected with two sides of the second-stage vaporizer;

the second reversing valve is positioned at the communication position of the third pipeline and the second loop pipeline and is positioned at one side facing the inlet end of the second-stage carburetor; the second reversing valve is provided with two second channels which are respectively communicated with the second loop pipeline and the third pipeline; the second reversing valve is electrically connected with the second temperature detector and controls the conduction of the second-stage carburetor and the third pipeline according to the second temperature detector.

9. The marine LNG cold energy recovery system of claim 1, further comprising:

a third loop pipeline, two ends of which are communicated with the liquid outlet and the air inlet of the tank body; and

a third vaporizer mounted on the third loop conduit; the third vaporizer is configured to vaporize the liquid LNG discharged from the liquid outlet, so that the gaseous LNG vaporized from the liquid LNG enters the tank through the gas inlet, thereby pressurizing the tank.

10. A ship comprising a ship according to any one of claims 1 to 9 and a marine LNG cold energy recovery system therefor.