CN112524473B

CN112524473B - Marine storage tank

Info

Publication number: CN112524473B
Application number: CN202011438833.8A
Authority: CN
Inventors: 罗哲; 于海东; 柏枫
Original assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Current assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-05-06
Anticipated expiration: 2040-12-07
Also published as: CN112524473A

Abstract

The invention provides a marine storage tank, which comprises a tank body for storing fuel and a cold box connected to the outer side of the tank body, wherein the cold box comprises: the shell is arranged at one end of the tank body and hermetically wraps the end of the tank body from the outer side; the partition board is vertically arranged in the shell and connected with the tank body, and separates the inner cavity of the shell into two cold box cavities which are opposite and sealed along the transverse direction of the tank body; the two cold box sub-cavities are respectively communicated with the two liquid outlets in a one-to-one correspondence manner; two sets of air supply devices are respectively arranged in the cavities of the two cold boxes one by one; each gas supply device comprises a cold energy recovery tank, a gasifier and a gas supply pipe; one end of the gas supply pipe is communicated with the outlet of the gasifier, and the other end of the gas supply pipe is higher than the gasifier and penetrates through the shell upwards to supply gas to the outside. This two cold box structures are located the same of LNG storage tank and serve to this whole axial length that has reduced traditional cold box, and isolated two cold box structures each other have sealed, the function of mutual noninterference, have improved gas supply unit's reliability.

Description

Marine storage tank

Technical Field

The invention relates to the technical field of natural gas single-fuel power ships, in particular to a marine storage tank.

Background

Liquefied Natural Gas (LNG) is used as a new ship energy source, and has the advantages of low carbon, environmental protection, economy and the like. The natural gas fuel ship engine is produced in the background of the industry, the single natural gas fuel is used as a driving fuel, and the domestic design and manufacture are completed. There is a real need to provide satisfactory fuels for such new marine engines. Especially with the vigorous development and application of natural gas on water in recent years, a number of LNG-powered ships have been launched successively and tested successfully.

Storage tanks for storing LNG on existing LNG-powered ships have a single-cold-tank gas supply mode and a double-cold-tank gas supply mode. At present, the double cold boxes are respectively arranged at the end sockets at two ends of the storage tank. Because the air supply pipeline is arranged in the cold box, the volume of the cold box is large, and the arrangement mode occupies the installation space of the ship body.

Disclosure of Invention

The invention aims to provide a marine storage tank, which aims to solve the problem that a double-cold-tank structure of an LNG storage tank in the prior art occupies too much space of a ship body.

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

the utility model provides a marine storage tank, this marine storage tank includes the jar body that is used for storing fuel and connects the cold box in jar external side, set up two liquid outlets along horizontal spaced on the tip of the jar body, the cold box includes: the shell is arranged at one end of the tank body and hermetically wraps the end of the tank body from the outer side; the partition plate is vertically arranged in the shell and is connected with the tank body, and the inner cavity of the shell is divided into two cold box cavities which are opposite and sealed along the transverse direction of the tank body; the two cold box sub-cavities are respectively communicated with the two liquid outlets in a one-to-one correspondence manner; two sets of air supply devices are respectively arranged in the cavities of the two cold boxes one by one; each gas supply device comprises a cold energy recovery tank, a gasifier and a gas supply pipe; the liquid inlet of the cold energy recovery tank is communicated with the corresponding liquid outlet; the inlet of the gasifier is communicated with the liquid outlet of the cold energy recovery tank; one end of the gas supply pipe is communicated with an outlet of the gasifier, and the other end of the gas supply pipe is higher than the gasifier and penetrates the shell upwards to supply gas to the outside.

According to one embodiment of the invention, the partition is coplanar with the axis of the tank.

According to one embodiment of the invention, one end of the partition has an arcuate profile adapted to the outer wall of the end of the tank to enable corresponding attachment thereto.

According to one embodiment of the invention, the cold energy recovery tank is located in the middle of the cold box cavity in the direction of the axis of the tank body.

According to one embodiment of the invention, the gas supply pipe comprises an axial pipe section and an inclined pipe section bent upwards and extending from one end of the axial pipe section; the axial pipe section extends along the axis of the tank body and is communicated with the gasifier; the inclined pipe section is positioned above the cold energy recovery tank and extends outwards out of the shell.

According to one embodiment of the invention, a mounting hole is formed in the side wall of the housing, and the mounting hole is communicated with one of the cold box cavities; the end socket is provided with a liquid filling port and a gas filling port which are vertically spaced, and the gas filling port is higher than the liquid filling port; the gas filling phase port and the liquid filling phase port are both communicated with the other cold box cavity;

the cold box further comprises a filling liquid phase pipe and a filling gas phase pipe which are fixed in the mounting hole in a penetrating mode, the filling liquid phase pipe penetrates through the partition plate to be connected and communicated with the filling liquid phase port, and the filling gas phase pipe penetrates through the partition plate to be correspondingly connected with the filling gas phase port.

According to an embodiment of the present invention, the mounting hole is located closer to the tank body than the cold energy recovery tank, and is located at an upper portion of the outer shell.

According to one embodiment of the invention, the bottom of the shell is also provided with two sewage discharge holes which are transversely spaced along the tank body; the two sewage discharge holes are respectively communicated with the two cold box sub-cavities in a one-to-one correspondence manner.

According to one embodiment of the invention, the housing includes a barrel portion and a cover plate; the barrel part is cylindrical and is fixedly connected with the outer wall of the tank body along the axis direction of the tank body; the cover plate is arranged at the other end of the cylinder body part far away from the tank body in a sealing way, and two spaced manholes are formed in the cover plate; the two manholes are respectively communicated with the two cold box cavities in a one-to-one correspondence mode.

According to one embodiment of the invention, the gas supply device further comprises a first liquid inlet pipe; the first liquid inlet pipe penetrates through the shell and is communicated with the top of the cold energy recovery tank; the first liquid inlet pipe is arranged close to the gas supply pipe and is positioned at the upper part of the shell.

According to an embodiment of the present invention, at least one of the gas supply devices further comprises an auxiliary gas supply pipe; the auxiliary air supply pipe penetrates through the shell and is communicated with the air supply pipe; the auxiliary air supply pipe is disposed adjacent to the air supply pipe and at an upper portion of the housing.

According to one embodiment of the invention, the gas supply device further comprises a second liquid inlet pipe; the second liquid inlet pipe is opposite to the gasifier; the second liquid inlet pipe penetrates through the shell and is communicated with the gasifier, and the second liquid inlet pipe is positioned at the upper part of the shell.

According to an embodiment of the invention, the gas supply device further comprises a gas tank; the gas tank is fixedly arranged on the clapboard and is suspended above the gasifier; the gas inlet of the gas tank is communicated with the outlet of the gasifier and is used for storing the vaporized fuel gas; and the gas outlet of the gas tank is communicated with the end part of the gas supply pipe in the shell.

According to the technical scheme, the marine storage tank provided by the invention at least has the following advantages and positive effects:

the marine storage tank improves the arrangement mode of the cold box, and particularly forms two independent and sealed sub-cavities by arranging the partition plates in the cold box to separate the inner cavity of the cold box, and respectively arranges the air supply devices in the sub-cavities of the cold box, namely, a double-cold-box structure is formed. And, the double cold box structure is located on the same end of the LNG storage tank, thereby reducing the overall axial length of the conventional cold box. Therefore, the installation space of the ship body is saved, the mutually isolated double-cold-box structures have the functions of sealing and mutual noninterference, and the reliability of the gas supply device is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a marine storage tank according to an embodiment of the present invention.

FIG. 2 is a schematic view of the interior of the cold box in an embodiment of the present invention.

Fig. 3 is a schematic view of a pipeline structure on a sealing head of a tank body in the embodiment of the invention.

Fig. 4 is a side view of fig. 2.

Fig. 5 is a top view of fig. 2.

Fig. 6 is a front view of fig. 2.

The reference numerals are explained below:

1-tank body, 11-cylinder body, 13-end enclosure, 101-liquid outlet, 102-liquid filling port, 103-gas filling port, 104-safety valve port,

3-a cold box,

31-shell, 311-barrel part, 312-cover plate, 301-manhole, 302-sewage hole, 303-mounting hole, 32-clapboard,

33-a cold box sub-chamber, 33 a-a first sub-chamber, 33 b-a second sub-chamber,

35-gas supply device, 351-cold energy recovery tank, 352-gasifier, 353-gas supply pipe, 3531-axial pipe section, 3533-inclined pipe section, 356-auxiliary gas supply pipe, 357-gas tank, 358-first liquid inlet pipe, 359-second liquid inlet pipe,

361-liquid filling pipe, 362-gas filling pipe,

37-a diffusing pipeline device,

38-diffusing tube.

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.

The embodiment provides a marine storage tank for supplying a natural gas fuel meeting requirements to a marine gas engine, which mainly comprises a tank body for storing the fuel (liquefied natural gas LNG) and a cold box connected to the outer side of one end of the tank body. The interior of the cold box is provided with a partition plate to form two independent cold box sub-cavities, and a set of air supply device is correspondingly arranged in each cold box sub-cavity; because the arrangement of the partition plate provides reliable sealing performance, the two sets of air supply devices can not interfere with each other when in work. Meanwhile, the double-cold box structure is positioned at the same end of the tank body, so that the space on the ship occupied by the whole tank body can be effectively reduced.

Referring to fig. 1, fig. 1 shows a specific structure of a marine storage tank provided in this embodiment, which includes a tank body 1 and a cold box 3 connected to an outer side of the tank body 1.

The tank body 1 is horizontally arranged and comprises a tank body 11 and end sockets 13 arranged at two ends of the tank body 11.

The cold box 3 comprises a shell 31 connected with the end enclosure 13, a partition plate 32 arranged in the shell 31 and two sets of air supply devices 35.

The outer shell 31 is provided at one end of the can body 1 and hermetically wraps the end of the can body 1 from the outside to provide good sealability.

The partition 32 is vertically arranged inside the shell 31 and connected with the tank body 1, and divides the inner cavity of the shell 31 into two cold box cavities 33 which are opposite and sealed along the transverse direction of the tank body 1.

Specifically, the housing 31 includes a cylindrical body portion 311 and a cover plate 312.

The cylindrical part 311 is cylindrical, and the diameter of the cylindrical part is correspondingly matched with that of the tank body 1; one end of the cylindrical portion 311 is hooped on the outer wall of the can body 1 along the axial direction of the can body 1.

The cover 312 is sealed at the other end of the body 311 away from the tank 1 to form a closed space. The cover plate 312 is provided with two spaced manholes 301; two manholes 301 communicate with each other with two cold box chamber 33 one-to-one respectively, and manhole 301 supplies the staff to get into and carries out the pipeline in the cold box chamber 33 and overhauls.

Two sets of air supply devices 35 are respectively arranged in the two cold box cavities 33 one by one and used for providing fuel gas for the marine engine one by one.

Referring to fig. 2, the partition 32 is in the same plane with the axis of the tank 1, i.e. the two cold box cavities 33 are symmetrically arranged along the axis.

One end of the partition plate 32 is provided with an arc-shaped outline matched with the outer wall of the end part of the tank body 1 so as to be correspondingly connected and fixed on the outer wall; the other end of the partition plate 32 is vertical and abuts against the inner surface of the cover plate 312.

In this embodiment, the partition plate 32 and the housing 31 are made of stainless steel, which has the advantages of corrosion resistance and good sealing.

Because the setting of baffle 32, two cold box sub-chambers 33 are isolated each other and sealed, have guaranteed both mutual noninterference, have divided two less safe ranges promptly, cause the too big problem of influence scope when avoiding taking place the leakage problem among the air feeder 35.

For convenience of description, hereinafter, the two cold box sub-chambers 33 may be a first sub-chamber 33a and a second sub-chamber 33b, respectively.

Referring to fig. 3, the end enclosure 13 connected to the partition plate 32 is provided with two liquid outlets 101 spaced along the transverse direction of the tank 1 for providing an air supply source for the air supply device 35.

The two cold box cavities 33 are respectively communicated with the two liquid outlets 101 in a one-to-one correspondence manner, so that the two gas supply devices 35 have independent gas supply sources, insufficient gas supply caused when the pipeline breaks down is avoided, and the dangerous condition caused by the loss of power of the ship is avoided.

The end socket 13 is also provided with a liquid filling port 102 and a gas filling port 103 which are spaced up and down in the height direction, and the gas filling port 103 is higher than the liquid filling port 102. Wherein, the liquid filling port 102 and the gas filling port 103 are used for filling the fuel liquid from the outside into the tank 1. The gas-filling port 103 and the liquid-filling port 102 are located on one lateral side of the end cap 13.

The sealing head 13 is further provided with a relief valve port 104 above the liquid outlet 101 for dispensing.

Referring to fig. 4 to 6, each air supply device 35 includes a cooling energy recovery tank 351, a vaporizer 352, and an air supply pipe 353.

Wherein, the cold energy recovery tank 351 and the gasifier 352 are arranged at intervals in the axis direction of the tank body 1 in the cold box cavity 33, and the cold energy recovery tank 351 is closer to the tank body 1 than the gasifier 352. Preferably, the cold energy recovery tank 351 and the vaporizer 352, each located in two cold box sub-chambers 33, are symmetrically arranged with respect to the partition 32 so that the weight of each component in the cold box 3 is uniformly dispersed.

The cold energy recovery tank 351 is used to communicate with the tank 1, thereby recovering the cold energy of the LNG liquid and providing a liquid source for the vaporizer 352.

Specifically, a liquid inlet is disposed at the bottom of the cold energy recovery tank 351, and the liquid inlet is communicated with the corresponding liquid outlet 101 on the tank body 1.

Preferably, the cold energy recovery tank 351 is located at the middle of the cold box chamber 33 in the axial direction of the can body 1. Since the volume of the cold energy recovery tank 351 is larger than that of the vaporizer 352, it stores more liquid and has a heavy weight; therefore, the arrangement in the middle part is beneficial to weight balance, and one side of the cold box 3 is prevented from being too heavy.

The vaporizer 352 is a heat exchanger dedicated to LNG vaporization, and an inlet of the vaporizer 352 is communicated with the liquid outlet 101 of the cold energy recovery tank 351 to vaporize Liquefied Natural Gas (LNG) from the cold energy recovery tank 351.

The vaporizer 352 has a vertical structure, can vaporize water, glycol and other solutions as intermediate heating media, and has the advantages of compact structure, small floor area and the like.

A gas supply pipe 353 has one end communicating with an outlet of the vaporizer 352 and the other end passing upward through the housing 31 above the vaporizer 352 to supply gas to the outside.

Specifically, the gas supply pipe 353 includes an axial pipe section 3531 and an inclined pipe section 3533 bent and extended upward from one end of the axial pipe section 3531. An axial tube section 3531 extends along the axis of the vessel 1 and is connected to the gasifier 352. A control valve for shut-off is arranged on the axial pipe section 3531. The inclined pipe section 3533 is located above the cold energy recovery tank 351 and extends outward from the outer case 31. That is, the opening position of the air supply pipe 353 on the casing 31 is close to the cold energy recovery tank 351, and is located not only at the middle portion of the casing 31 but also at the upper portion of the casing 31.

Further, the air supply device 35 in the second sub-chamber 33b further comprises an auxiliary air supply pipe 356. The auxiliary air supply pipe 356 is used as a backup in case of failure of the air supply pipe 353.

The structure of the auxiliary air supply pipe 356 is similar to that of the air supply pipe 353, and both are designed to be bent. One end of the auxiliary air supply pipe 356 is connected and communicated with the side wall of the air supply pipe 353, and the joint of the two is positioned at the upstream of the control valve on the axial pipeline; the other end of the auxiliary air supply pipe 356 passes out of the housing 31 and is disposed close to the air supply pipe 353, also located at the upper portion of the housing 31. It should be noted that the auxiliary air supply pipe 356 is correspondingly disposed on one side of the sub-chamber; if necessary, an auxiliary air supply pipe 356 may be further provided to the sub-chamber on the other side.

During operation, the low-temperature LNG fuel may flow into the cold energy recovery tank 351 under the pressure of the gas phase space in the tank body 1 to recover the cold energy of the LNG. Then the low-temperature fuel in the cold energy recovery tank 351 is heated by the gasifier 352 and gasified into gas fuel, and the gas flow and pressure are controlled by the proportional control valve on the gas supply pipe 353, so that the flow, pressure and temperature of the supplied gas fuel can meet the requirement of the continuous and stable operation of the marine gas engine. Moreover, when the air supply device 35 in the cold box sub-chamber 33 on one side has a fault, the air supply device 35 in the sub-chamber on the other side can be switched to the air supply source of the engine, and simultaneously, the root valve on the fault side can be automatically closed to cut off the fault source, thereby realizing uninterrupted air supply.

As shown in fig. 5, the bottom of the housing 31 is further provided with two sewage draining holes 302 spaced along the transverse direction of the tank 1; the two sewage discharge holes 302 are respectively communicated with the two cold box sub-cavities 33 in a one-to-one correspondence manner, so that sewage discharge treatment can be carried out when leakage occurs in the respective sub-cavities.

In this embodiment, the gas supply device 35 further includes a gas tank 357 to buffer the vaporized LNG gas.

The gas tank 357 is provided between the vaporizer 352 and the gas supply pipe 353.

Specifically, the air tank 357 is fixedly disposed on the partition 32 and suspended above the vaporizer 352. The tank 357 has a smaller volume than the gasifier 352. The air inlet of the air tank 357 is connected to the outlet of the vaporizer 352 for storing the fuel gas from the vaporizer 352; the gas outlet of the gas tank 357 communicates with the gas supply pipe 353 at the inner end inside the housing 31.

In this embodiment, the cold box 3 also has a filling function, which comprises a liquid filling phase pipe 361 and a gas filling phase pipe 362.

Correspondingly, a mounting hole 303 is formed in a side wall of the housing 31, and the mounting hole 303 is communicated with one of the cold box sub-chambers 33 (the second sub-chamber 33 b).

The mounting hole 303 is located closer to the tank body 1 than the cold energy recovery tank 351 and at the upper portion of the housing 31.

The gas-filling phase port 103 and the liquid-filling phase port 102 are located on one lateral side of the end closure 13 and are communicated with the other cold box sub-chamber 33 (the first sub-chamber 33 a).

A liquid-filling pipe 361 and a gas-filling pipe 362 are respectively fixed in the mounting hole 303 in a penetrating way, and the inner end of the liquid-filling pipe 361 in the cold box 3 passes through the partition plate 32 and extends to the liquid-filling port 102 to realize connection and communication; the inner end of the gas-filling pipe 362 is connected to the gas-filling port 103 through the partition 32.

In the using process, when the low-temperature fuel in the tank body 1 is insufficient, liquid phase pipelines and gas phase pipelines of a liquid supply gas station or a tank car and the like are respectively connected with a liquid filling phase pipe 361 and a gas filling phase pipe 362 in a one-to-one correspondence mode, and liquid enters a filtering system through a liquid pump or a pressurized liquid, and then the storage tank is filled with liquid through selecting an upper liquid filling valve or a lower liquid filling valve. Moreover, when the pressure in the storage tank is higher, partial pressure can be released to a gas filling station or a tank car storage tank through a gas phase port, so that emptying loss is reduced. When the fuel is full, an alarm signal can be sent out through overflow protection equipment attached to the pipeline, and the main filling valve is automatically cut off, so that the fuel is prevented from being over-filled.

Further, the gas supply device 35 further comprises a first liquid inlet pipe 358.

First feed liquor pipe 358 is used for providing external low temperature LNG for cold energy recovery tank 351, avoids influencing the air feed when the inside LNG of storage tank is not enough.

The first liquid inlet pipe 358 penetrates the housing 31 to be connected and communicated with the top of the cold energy recovery tank 351. And the first liquid inlet pipe 358 is disposed adjacent to the gas supply pipe 353 and at the upper portion of the housing 31. That is, the air supply pipe 353, the auxiliary air supply pipe 356, and the first liquid inlet pipe 358 are all disposed adjacently and collectively in a triangular distribution.

The gas supply means 35 further comprises a second liquid inlet pipe 359. The second inlet 359 is used to provide ambient cryogenic LNG or other medium to the vaporizer 352 for use as an auxiliary liquid feed.

A second inlet pipe 359 is disposed opposite the vaporizer 352; a second liquid inlet pipe 359 communicates with the bottom of the gasifier 352 through the shell 31. And a second liquid inlet pipe 359 is located at an upper portion of the housing 31 and is spaced apart from the gas supply pipe 353 in the axial direction.

In the present embodiment, the cold box 3 also has a diffusing function.

A safety valve port 104 is arranged above the liquid outlet 101 of the seal head 13 of the tank body 1, and a Y-shaped diffusion pipeline device 37 is communicated with the safety valve port 104. The diffusing device is also externally connected with a diffusing pipe which penetrates out of the outer side of the cold box 3.

When the pressure in the tank body 1 is too high, combustible gas can be led to a safe area to be discharged through the diffusing pipeline device 37 in the gas supply devices 35 in the two sub-chambers in a manual or automatic mode, so that safety accidents are prevented.

In summary, the marine storage tank provided by the invention at least has the following advantages and positive effects:

the marine storage tank improves the arrangement mode of the cold box 3, and particularly forms two independent and sealed sub-cavities by arranging the partition plates 32 in the cold box 3 to separate the inner cavity of the cold box, and respectively arranges the air supply devices 35 in the sub-cavities 33 of the cold box, namely, a double-cold-box structure is formed. And, the double cold box structure is located on the same end of the LNG storage tank, thereby reducing the overall axial length of the conventional cold box 3. Thus, the installation space of the ship body is saved, the mutually isolated double-cold-box structure has the functions of sealing and mutual noninterference, and the reliability of the air supply device 35 is improved.

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. The utility model provides a marine storage tank, its characterized in that, this marine storage tank includes the jar body that is used for storing fuel and connects in the cold box of jar external side, two liquid outlets along horizontal spaced have been seted up to head department on the one end tip of the jar body, the cold box includes:

the shell is arranged at the end socket and hermetically wraps the end socket from the outer side;

the partition plate is vertically arranged in the shell and is connected with the end enclosure, and the inner cavity of the shell is divided into two cold box cavities which are opposite and sealed along the transverse direction of the tank body; the two cold box sub-cavities are respectively communicated with the two liquid outlets in a one-to-one correspondence manner;

two sets of air supply devices are respectively arranged in the cavities of the two cold boxes one by one; each gas supply device comprises a cold energy recovery tank, a gasifier and a gas supply pipe; the liquid inlet of the cold energy recovery tank is communicated with the corresponding liquid outlet; the inlet of the gasifier is communicated with the liquid outlet of the cold energy recovery tank; one end of the gas supply pipe is communicated with an outlet of the gasifier, and the other end of the gas supply pipe is higher than the gasifier and penetrates the shell upwards to supply gas to the outside;

a mounting hole is formed in the side wall of the shell and communicated with one of the cold box cavities;

the end socket is provided with a liquid filling port and a gas filling port which are vertically spaced in the height direction, and the gas filling port and the liquid filling port are both communicated with the other cold box cavity; the cold box further comprises a filling liquid phase pipe and a filling gas phase pipe which are fixed in the mounting hole in a penetrating mode, the filling liquid phase pipe penetrates through the partition plate to be connected and communicated with the filling liquid phase port, and the filling gas phase pipe penetrates through the partition plate to be correspondingly connected with the filling gas phase port.

2. The marine tank of claim 1, wherein:

the axis of the partition plate and the axis of the tank body are in the same plane.

3. The marine tank of claim 1, wherein:

one end of the partition plate is provided with an arc-shaped outline matched with the outer wall of the end part of the tank body so as to be correspondingly connected and fixed on the outer wall.

4. The marine tank of claim 1, wherein:

the cold energy recovery tank is positioned at the middle part of the cold box cavity along the axis direction of the tank body.

5. Marine tank according to claim 4, characterised in that:

the gas supply pipe comprises an axial pipe section and an inclined pipe section which is bent upwards and extends out of one end of the axial pipe section; the axial pipe section extends along the axis of the tank body and is communicated with the gasifier; the inclined pipe section is positioned above the cold energy recovery tank and extends outwards out of the shell.

6. The marine tank of claim 1, wherein:

the filling gas phase port is higher than the filling liquid phase port.

7. The marine tank of claim 1, wherein:

the mounting hole is closer to the tank body than the cold energy recovery tank, and is located at an upper portion of the outer shell.

8. The marine tank of claim 1, wherein:

the bottom of the shell is also provided with two sewage discharge holes which are transversely spaced along the tank body;

the two sewage draining holes are respectively communicated with the two cold box cavities in a one-to-one correspondence manner.

9. The marine tank of claim 1, wherein:

the shell comprises a barrel part and a cover plate;

the barrel part is cylindrical and is fixedly connected with the outer wall of the tank body along the axis direction of the tank body; the cover plate is arranged at the other end of the cylinder body part far away from the tank body in a sealing way, and two spaced manholes are formed in the cover plate; the two manholes are respectively communicated with the two cold box cavities in a one-to-one correspondence mode.

10. The marine tank of claim 1, wherein:

the gas supply device also comprises a first liquid inlet pipe;

the first liquid inlet pipe penetrates through the shell and is communicated with the top of the cold energy recovery tank; the first liquid inlet pipe is arranged close to the gas supply pipe and is positioned at the upper part of the shell.

11. The marine tank of claim 1, wherein:

at least one gas supply device also comprises an auxiliary gas supply pipe;

the auxiliary air supply pipe penetrates through the shell and is communicated with the air supply pipe; the auxiliary air supply pipe is disposed adjacent to the air supply pipe and at an upper portion of the housing.

12. The marine tank of claim 1, wherein:

the gas supply device also comprises a second liquid inlet pipe;

the second liquid inlet pipe is opposite to the gasifier; the second liquid inlet pipe penetrates through the shell and is communicated with the gasifier, and the second liquid inlet pipe is positioned at the upper part of the shell.

13. The marine tank of claim 1, wherein:

the gas supply device further comprises a gas tank;

the gas tank is fixedly arranged on the clapboard and is suspended above the gasifier;

the gas inlet of the gas tank is communicated with the outlet of the gasifier and is used for storing the vaporized fuel gas; and the gas outlet of the gas tank is communicated with the end part of the gas supply pipe in the shell.