KR102406282B1 - Liquefied hydrogen storage tank venting system for liquefied hydrogen vessels - Google Patents

Abstract

A liquid hydrogen storage tank vent device of a liquid hydrogen ship is disclosed. The liquid hydrogen storage tank vent device of the disclosed liquid hydrogen ship, is coupled to the hull, the hydrogen storage tank unit in which liquid hydrogen is stored; a vent pipe part coupled to the hydrogen storage tank part and through which the hydrogen gas leaked from the hydrogen storage tank part flows; and a discharge nozzle part connected to the vent pipe part and disposed in the lower region of the hull for discharging the hydrogen gas, wherein the vent pipe part includes a vent line communicating the hydrogen storage tank part and the discharge nozzle part Including, at least a portion of the vent line is characterized in that it is installed in the interior of the hull.

Description

Liquefied hydrogen storage tank venting system for liquefied hydrogen vessels

The present invention relates to a venting apparatus for a liquid hydrogen storage tank for a liquid hydrogen ship, and more particularly, to a liquid hydrogen storage tank vent apparatus for a liquid hydrogen ship with an easy structural design.

In recent years, the demand for energy is continuously increasing due to the rapid development of industrialization and the increase of the population. Accordingly, there is an urgent need for supply and demand for alternative energy due to the depletion of fossil fuels.

In particular, in the case of Korea, energy consumption is so large that it ranks in the top 10 in the world, yet more than 90% of the energy used is dependent on foreign imports, so measures to secure energy are urgently needed.

Hydrogen is being considered as an alternative energy source that is attracting attention to solve complex energy problems facing the world.

Hydrogen is not only the most abundant element on the planet after carbon and nitrogen, but also produces only a very small amount of nitrogen oxide during combustion and is a clean energy source that does not emit any other pollutants. It can be made from raw materials, and since it is recycled back into water after use, it can be said to be an optimal alternative energy source without fear of exhaustion.

When used as liquid hydrogen, hydrogen has the highest energy density to weight on earth, and its storage efficiency is secured with a volume of less than 1/770 compared to gaseous form, so it is used as a fuel for hydrogen vehicles, unmanned aerial vehicles, and rocket propellants. If this is solved, hydrogen fueled ships that use hydrogen as fuel are expected to become a technology that preoccupies the future shipbuilding market.

In addition to the above-described hydrogen fuel-propelled ship, a hydrogen transport ship capable of transporting liquid hydrogen has a high value.

However, since liquefied hydrogen has a lower liquefaction temperature than cryogenic LNG (-162℃) with a liquefaction temperature of -253℃, it is vaporized more easily than LNG, and the evaporation rate per volume (BOR: Boil-Off Rate) is lower than that of LNG. ten times as much

Due to these properties of liquid hydrogen, the problem of increasing the pressure in the storage tank due to the hydrogen gas (BOG: Boil-Off Gas) generated in the storage tank is much more serious than that of LNG.

If the pressure inside the storage tank is left unattended, it may lead to the risk of an explosion, so it is necessary to treat the hydrogen gas generated in the storage tank. As such a solution, a method of discharging hydrogen gas generated in the storage tank by installing a vent mast vertically high on the upper part of the hull was used in the prior art.

On the other hand, hydrogen is a combustible gas, and the location of the final outlet of the vent mast is limited according to the hazardous area stipulated in the International Ship Safety Regulations (IGC code) related to ships. Here, the hazardous area is Zone 0, Zone It can be classified into 1, Zone 2.

Zone 0 is a place where explosive gas atmosphere exists continuously/for a long time or frequently (inside a fuel tank, in piping and equipment containing fuel, in a pressure relief pipe for fuel tank or in a venting pipe, etc.).

Zone 1 is an area where explosive gas atmospheres are generated periodically or frequently during normal operation (eg, tank junction areas, fuel storage areas and inter-barrier areas).

Zone 2 is a place where an explosive gas atmosphere is not created during normal operation or can exist only for a short period even if it is created (such as an area within 1.5 m around an open or semi-enclosed area of Zone 1).

According to the current regulations (Low Flash Point Fuel Vessel Rules), the final outlet of the vent mast is Zone 1, at least 6m above the work area and passageway, and at least from the nearest air inlet to the residential area, work area and other non-hazardous areas. It should be placed more than 10m away.

Conventionally, the vent mast was designed to rise vertically from the upper part of the hull by these regulations, but in the case of a small ship, there is a problem in that there is a limit in installing the vent mast high due to the limited size of the ship.

In addition, when the vent mast having a relatively high height compared to the size of the hull is installed, it is difficult to design the structural strength of the ship and additional structural materials are required to install additional supports for supporting the vent mast.

Therefore, the problem to be solved by the present invention is to provide a vent device for a liquid hydrogen storage tank of a liquid hydrogen ship that facilitates the structural strength design of the ship and does not require additional structural materials.

Meanwhile, the technical problem of the present invention is not limited to the above-mentioned problems, and another problem not mentioned will be clearly understood by those skilled in the art from the following description.

A liquid hydrogen storage tank vent device of a liquid hydrogen ship according to an aspect of the present invention includes: a hydrogen storage tank unit coupled to a hull and storing liquid hydrogen therein; a vent pipe part coupled to the hydrogen storage tank part and through which the hydrogen gas leaked from the hydrogen storage tank part flows; and a discharge nozzle part connected to the vent pipe part and disposed in the lower region of the hull to discharge the hydrogen gas, wherein the vent pipe part is a vent line communicating the hydrogen storage tank part and the discharge nozzle part It is characterized in that it is installed inside the hull.

The hydrogen storage tank unit, a hydrogen storage tank constituting the inner container and the outer container, is provided in the vertical direction of the inner container, the outlet for discharging the leaked hydrogen gas to the outside of the inner container, and between the inner container and the outer container It is interposed and is provided at the lower portion in the vertical direction of the outer container, and may include a discharge pipe for discharging the hydrogen gas introduced from the outlet to the outside.

The vent pipe part further includes a vent valve installed between the vent line connected to the discharge pipe of the hydrogen storage tank part and configured to open when the hydrogen gas supplied from the discharge pipe exceeds a set pressure, and the set pressure is 1 to less than 20 bar.

The discharge nozzle part is disposed at a height lower than the waterline of the hull, and may be formed to form a shape for preventing the inflow of seawater.

The discharge nozzle part is coupled to the vent pipe part, the first body is formed with a hollow interior, and is connected to the first body, is formed with a hollow interior, and is different from the size of the inner diameter of the first body It may include a second body formed in a shape having the size of the inner diameter.

The size of the inner diameter of the second body may be smaller than the size of the inner diameter of the first body.

The discharge nozzle unit may include a third body formed with a hollow interior, connected to the first body and the second body, and disposed between the first body and the second body.

The third body may be formed in an inclined shape such that the size of the inner diameter decreases from the first body toward the second body.

The hydrogen storage tank is composed of a pressure tank using the internal pressure charged in the inner container as a hydrogen supply means for propulsion of the ship, and the set pressure of the vent valve may be less than a to 20 bar, where, The a is the pressure obtained by adding the atmospheric pressure and the sea water pressure according to the distance (H) from the sea level to the discharge nozzle part.

The hydrogen storage tank is composed of an atmospheric pressure tank in which the internal pressure charged in the inner container is atmospheric pressure, and the vent piping unit re-liquefies the hydrogen gas flowing out from the hydrogen storage tank to recharge the hydrogen storage tank. In order to do so, the pressure for discharging the hydrogen gas leaked from the hydrogen storage tank may be supplied from the compressor of the reliquefaction system mounted on the ship.

The vent piping unit includes a first discharge line through which the hydrogen gas discharged from the hydrogen storage tank flows to the compressor of the re-liquefaction system, and a second discharge line through which the pressurized hydrogen gas discharged from the compressor is transferred to the discharge nozzle unit. including a line, wherein the reliquefaction system further comprises a hydrogen gas distributor controlling to discharge excess hydrogen gas exceeding the hydrogen gas capacity operated in the reliquefaction system to the second discharge line of the vent piping part can

The pressure of the hydrogen gas discharged to the second discharge line of the vent pipe portion may be less than a to 20 bar. Here, a is the pressure obtained by adding the atmospheric pressure and the seawater pressure according to the distance H from the sea level to the discharge nozzle part.

Embodiments of the present invention, a hydrogen storage tank part in which hydrogen is stored and a vent piping part through which outflow hydrogen leaked from the hydrogen storage tank part flows, and a discharge nozzle disposed in the lower area of the hull to discharge hydrogen outflow By providing the part, there is no need to install the vent mast in the upper region of the hull, and accordingly, the structural strength design of the ship is facilitated and additional structural materials such as a support for supporting the vent mast are not required.

In addition, embodiments of the present invention by having a vent line installed in the interior of the hull, it is possible to prevent the vent line from being damaged by external factors during anchoring and running of the shelf.

On the other hand, the effects described above are merely exemplary, and effects predicted or expected from the detailed configuration of the present invention from the point of view of those skilled in the art may also be added to the inherent effects of the present invention.

1 is a view showing a liquid hydrogen storage tank vent device of a liquid hydrogen ship according to a first embodiment of the present invention.
FIG. 2 is a view showing a cross-section of part 'A' of FIG. 1 .
FIG. 3 is a view showing the hydrogen storage tank of FIG. 1 .
4 is a view showing a vent device for a liquid hydrogen storage tank of a liquid hydrogen ship according to a second embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components will be given the same reference numbers regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

While the present disclosure has been illustrated and described in detail in the drawings and the foregoing description, the present disclosure is to be considered illustrative and not restrictive in nature, and only certain embodiments have been shown and described, which are within the spirit of the present disclosure. It will be understood that all changes and modifications that are introduced are desirably protected.

1 is a view showing a vent device for a liquid hydrogen storage tank of a liquid hydrogen ship according to a first embodiment of the present invention, FIG. 2 is a view showing a cross-section of part 'A' of FIG. 1, FIG. 3 is a view 1 is a view showing the hydrogen storage tank unit.

The liquid hydrogen storage tank vent device of the liquid hydrogen ship according to this embodiment, as shown in FIGS. 1 to 3, a hydrogen storage tank unit 110, a vent piping unit 120 and a discharge nozzle unit ( 130). The liquid hydrogen ship of this embodiment is a hydrogen fueled propulsion ship propelled by using hydrogen as a fuel.

The hydrogen storage tank unit 110 is coupled to the hull P as shown in FIG. 1 . In this embodiment, the hydrogen storage tank unit 110 may be disposed on the upper portion of the deck or disposed inside the hull (P).

Liquid hydrogen used for propulsion of the hull P is stored in the hydrogen storage tank unit 110 .

The hydrogen storage tank unit 110 is provided in the vertical direction of the hydrogen storage tank 111 constituting the inner container 111a and the outer container 111b, and the inner container 111a, as shown in FIG. 3 . However, the outlet 112 for discharging the hydrogen gas leaked from the inner container 111a to the outside of the inner container 111a and the inner container 111a and the outer container 111b are interposed between the vertical direction of the outer container 111b. It is provided at the bottom and includes a discharge pipe 113 for discharging the hydrogen gas introduced from the discharge port 112 to the outside.

The hydrogen storage tank 111 includes an inner container 111a and an outer container 111b surrounding the inner container 111a and a heat insulating member disposed between the inner container 111a and the outer container 111b. In this embodiment, the hydrogen storage tank 111 is composed of a pressure tank using the internal pressure charged in the inner container (111a) as a hydrogen supply means for propulsion of the vessel.

The vent piping unit 120 is coupled to the hydrogen storage tank unit 110 and is supported on the hull (P). The hydrogen gas leaked from the hydrogen storage tank part 110 flows inside the vent piping part 120 .

As shown in FIG. 1, the vent piping unit 120 according to this embodiment communicates with the hydrogen storage tank unit and the discharge nozzle unit, and at least some of the lines are installed inside the hull P. The vent line 121 ) and a vent valve 122 installed between the vent line 121 connected to the discharge pipe 113 of the hydrogen storage tank and configured to open when the hydrogen gas supplied from the discharge pipe 113 exceeds a set pressure.

At least a portion of the vent line 121 is installed inside the hull (P). As such, at least the vent line 121 of the portion facing the discharge nozzle is installed inside the hull P, thereby preventing the vent line 121 from being damaged by external factors during anchoring and running of the shelf. In FIG. 1, it should be understood that the vent line 121 portion corresponding to the discharge nozzle unit 130 located below the sea level from below the upper surface of the ship P is installed inside the hull.

In this embodiment, the vent valve 122 is a relief valve, and the vent valve 122 is opened when the hydrogen gas supplied from the discharge pipe 113 exceeds a set pressure. The pressure set to open the vent valve 122 is 1 to less than 20 bar, preferably a to less than 20 bar. Here, a is the pressure obtained by adding the atmospheric pressure and the seawater pressure according to the distance (H) from the sea level to the discharge nozzle part

Meanwhile, the discharge nozzle unit 130 is connected to the vent pipe unit 120 . The discharge nozzle unit 130 is disposed in the lower region of the hull (P) to discharge the leaked hydrogen gas.

The discharge nozzle unit 130 is disposed at a lower height than the waterline (waterline) of the hull (P). The waterline refers to a line at which a ship is exposed above the water surface or a limit line at which the hull P is submerged, and the waterline is indicated by sea level in FIG. 1 .

As described above, the liquid hydrogen storage tank vent device of the liquid hydrogen ship according to this embodiment is disposed below the waterline and includes a discharge nozzle unit 130 for discharging outflow hydrogen, as in the prior art, a vent on the upper part of the hull (P). There is no need to install a mast, so the structural strength design of the ship is easy.

As shown in FIG. 2 , the discharge nozzle unit 130 according to this embodiment is coupled to the vent pipe unit 120 and has a hollow inside, so that the first body 131 and the first body 131 are formed. ) connected to a hollow inside, the second body 132 is formed in a shape having a size different from the size of the inside diameter of the first body 131, and the inside is hollow to form the first body 131 ) and a third body 133 connected to the second body 132 and disposed between the first body 131 and the second body 132, and disposed inside the first body 131, It includes a filter 134 to prevent intrusion.

The first body 131 is coupled to the vent pipe 120 . The first body 131 is formed in a circular pipe shape with a hollow inside.

The second body 132 is connected to the first body 131 through the third body 133 . The second body 132 is formed in a circular pipe shape with a hollow inside. In this embodiment, the second body 132 is formed in a shape having an inner diameter smaller than that of the first body 131 . A nozzle outlet M through which the outflow hydrogen is discharged is formed at the distal end of the second body 132 .

As described above, the discharge nozzle unit 130 according to the present embodiment includes the second body 132 having an inner diameter smaller than the inner diameter of the first body 131, so that the outflow hydrogen is finally discharged. It is possible to form a narrow shape of the nozzle discharge port (M) to be, and accordingly, it is possible to minimize the intrusion of seawater into the discharge nozzle unit 130 inside.

The third body 133 is disposed between the first body 131 and the second body 132 to connect the first body 131 and the second body 132 . This third body 133 is formed in a hollow shape inside.

In this embodiment, the third body 133 is formed in an inclined shape such that the size of the inner diameter decreases in the direction from the first body 131 to the second body 132 as shown in FIG. 2 . .

The filter 134 is disposed inside the first body 131 . The filter 134 is formed in a circular disk shape, and the outer circumferential surface of the filter 134 is coupled to the inner circumferential surface of the first body 131 .

The filter 134 according to the present embodiment prevents foreign substances contained in seawater from entering the interior of the first body 131 . To this end, the filter 134 may be formed of a porous material.

In addition, a special coating film or active surface treatment is performed on the outer and inner surfaces of the discharge nozzle unit 130 of this embodiment to prevent shellfish from sticking to the outer and inner surfaces of the discharge nozzle unit 130 .

On the other hand, the liquid hydrogen storage tank vent device of the liquid hydrogen ship according to this embodiment is provided with an opening and closing cover (not shown) provided on the hull P to open and close the discharge nozzle unit 130 . This opening/closing cover (not shown) exposes the discharge nozzle unit 130 to the outside only when the hydrogen gas is discharged from the discharge nozzle unit 130, and when the hydrogen gas is not discharged, the discharge nozzle unit 130 is closed. shielded from the outside.

Hereinafter, the operation of the liquid hydrogen storage tank vent device of the liquid hydrogen vessel of this embodiment will be described with reference to FIGS. 1 and 2 .

First, in order to prevent damage to the hydrogen storage tank unit 110 when the internal pressure of the hydrogen storage tank unit 110 is abnormally increased by the hydrogen gas vaporized in the hydrogen storage tank unit 110, a vent valve 122 is used. is opened so that hydrogen gas flows out into the vent piping unit 120 .

The leaked hydrogen gas is moved along the vent pipe part 120 and discharged into seawater through the discharge nozzle part 130 .

As described above, the liquid hydrogen storage tank vent device of the liquid hydrogen vessel according to this embodiment is for a vent through which the hydrogen storage tank unit 110 in which hydrogen is stored and the outflow hydrogen leaked from the hydrogen storage tank unit 110 flows. By having the piping unit 120 and the discharge nozzle unit 130 disposed in the lower region of the hull (P) for discharging outflow hydrogen, there is no need to install a vent mast in the upper region of the hull (P) as in the prior art. As a result, it is easy to design the structural strength of the ship, and there is an advantage in that additional structural materials such as supports to support the vent mast are not required.

In addition, the liquid hydrogen storage tank vent device of the liquid hydrogen ship according to this embodiment is provided with a vent line 121 installed inside the hull (P), so that the vent line 121 due to external factors during anchoring and operation of the shelf ) can be prevented from being damaged.

4 is a view showing a vent device for a liquid hydrogen storage tank of a liquid hydrogen ship according to a second embodiment of the present invention. The reliquefaction system 250 is mounted on the hull P, and for the convenience of the illustration, the reliquefaction system 250 is shown on the outside of the hull P in FIG. 4 .

Hereinafter, a second embodiment of the present invention will be described. In this embodiment, there is only a difference in the type of the hydrogen storage tank (not shown) and the configuration of the vent piping 220 compared to the first embodiment, and in the vent piping portion, the hydrogen storage tank and the discharge nozzle are In other configurations including that the communicating vent line is installed inside the hull, it is the same as the configuration of the first embodiment of FIGS.

The liquid hydrogen ship according to this embodiment shown in FIG. 4 is a ship for transporting liquid hydrogen. In FIG. 4, LH2 represents liquid hydrogen, and GH2 represents hydrogen gas.

4, the hydrogen storage tank unit 210 is coupled to the hull (P). In this embodiment, the hydrogen storage tank unit 210 may be disposed inside the hull (P).

A plurality of such hydrogen storage tank units 210 may be provided to be spaced apart from each other. Each of the plurality of hydrogen storage tank units 210 is connected to the vent piping unit 220 .

As described above, since the liquid hydrogen ship of this embodiment is a ship that transports liquid hydrogen unlike the first embodiment, the hydrogen storage tank (not shown) of this embodiment is different from the first embodiment in the inner container (not shown). It consists of an atmospheric pressure tank in which the charged internal pressure becomes atmospheric pressure. Accordingly, the internal pressure of the hydrogen storage tank unit 210 may be smaller than that of the first embodiment, and accordingly, the pressure of the hydrogen gas discharged from the discharge nozzle unit 130 is the external pressure (atmospheric pressure + seawater pressure according to the seawater pressure). ) can be smaller than

In order to solve this problem, the liquid hydrogen vessel according to the present embodiment is equipped with a re-liquefaction system 250 . In addition, the vent piping unit 220 of this embodiment is mounted on the hull (P) to re-liquefy the hydrogen gas flowing out from the hydrogen storage tank (not shown) to recharge it into a hydrogen storage tank (not shown). The pressure for discharging the hydrogen gas leaked from the hydrogen storage tank (not shown) is supplied from the compressor 251 of the system 250 .

To this end, the vent piping 220 is the first in which the hydrogen gas leaked from the hydrogen storage tank (not shown) flows to the compressor 251 provided in the reliquefaction system 250 as shown in FIG. 4 . It includes a discharge line L1 and a second discharge line L2 through which the pressurized hydrogen gas discharged from the compressor 251 is transferred to the discharge nozzle unit 130 .

The reliquefaction system 250 used in this embodiment transfers excess hydrogen gas exceeding the capacity of the hydrogen gas operated in the reliquefaction system 250 to the second discharge line L2 of the vent piping unit 220 . It further includes a hydrogen gas distributor 252 for controlling the discharge.

In this embodiment, the pressure of the hydrogen gas distributed to the second discharge line L2 through the hydrogen gas distributor 252 is a to less than 20 bar. Here, a is the pressure obtained by adding the atmospheric pressure and the seawater pressure according to the distance (H) from the sea level to the discharge nozzle part.

As described above, the liquid hydrogen storage tank vent device of the liquid hydrogen ship according to this embodiment includes a first discharge line (L1) and a second discharge line (L2) connected to the re-liquefaction system 250. By having an inner container ( The pressure of hydrogen gas discharged from the discharge nozzle unit 130 while using a hydrogen storage tank (not shown) consisting of an atmospheric pressure tank in which the internal pressure charged in the inner pressure is atmospheric pressure is the external pressure, that is, the sum of atmospheric pressure and seawater pressure. It can be higher than the sea water pressure according to the

Although the present embodiment has been described in detail with reference to the drawings above, the scope of the present embodiment is not limited to the drawings and description described above.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

Although the present embodiment has been described in detail with reference to the drawings above, the scope of the present embodiment is not limited to the drawings and description described above.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

110: hydrogen storage tank unit 111a: inner container
111b: outer container 111: hydrogen storage tank
112: outlet 113: outlet pipe
120, 220: piping for vent 121: vent line
122: vent valve 130: discharge nozzle unit
131: first body 132: second body
133: third body 134: filter
250: reliquefaction system 251: compressor
252: hydrogen gas distributor P: hull
L1: first discharge line L2: second discharge line

Claims (13)

delete delete a hydrogen storage tank unit coupled to the hull and disposed on the deck and exposed to the atmosphere, in which liquid hydrogen is stored;
a vent pipe part coupled to the hydrogen storage tank part and through which the hydrogen gas leaked from the hydrogen storage tank part flows; and
It is connected to the pipe for the vent and is disposed in the lower region of the hull and includes a discharge nozzle for discharging the hydrogen gas,
The hydrogen storage tank unit,
a hydrogen storage tank comprising an inner container and an outer container;
an outlet provided at an upper portion of the inner container in the vertical direction and discharging the leaked hydrogen gas to the outside of the inner container; and
It is interposed between the inner container and the outer container, and is provided at the lower portion in the vertical direction of the outer container, and includes a discharge pipe for discharging the hydrogen gas introduced from the outlet to the outside,
The vent pipe portion,
It is installed between the vent line connected to the discharge pipe of the hydrogen storage tank part, further comprising a vent valve configured to open when the hydrogen gas supplied from the discharge pipe exceeds a set pressure,
The vent piping part includes a vent line communicating the hydrogen storage tank part and the discharge nozzle part, and a part of the vent line is installed outside the hull and the rest is installed inside the hull,
The set pressure of the vent valve is less than a to 20 bar, wherein a is the pressure obtained by adding the atmospheric pressure and the seawater pressure according to the distance (H) from the sea level to the discharge nozzle part,
Venting device for liquid hydrogen storage tank of liquid hydrogen ship.
4. The method of claim 3,
The discharge nozzle unit,
It is disposed at a height lower than the waterline of the hull,
Characterized in that it is formed to form a shape to prevent the inflow of seawater,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
5. The method of claim 4,
The discharge nozzle unit,
a first body coupled to the vent pipe portion, the first body having a hollow interior; and
A second body connected to the first body and formed with a hollow inside, the second body being formed in a shape having an inner diameter different from that of the first body
containing,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
6. The method of claim 5,
The size of the inner diameter of the second body is characterized in that smaller than the size of the inner diameter of the first body,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
7. The method of claim 6,
The discharge nozzle unit,
The interior is formed hollow and connected to the first body and the second body, including a third body disposed between the first body and the second body,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
8. The method of claim 7,
The third body,
Characterized in that the first body is formed in an inclined shape such that the size of the inner diameter decreases in the direction from the first body toward the second body,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
delete 4. The method of claim 3,
The hydrogen storage tank,
and an atmospheric pressure tank in which the internal pressure charged in the inner container becomes atmospheric pressure,
The vent pipe portion,
In order to reliquefy the hydrogen gas flowing out from the hydrogen storage tank and recharge it into the hydrogen storage tank, a pressure for discharging the hydrogen gas leaked from the hydrogen storage tank is supplied from a compressor of a reliquefaction system mounted on a ship. to do,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
11. The method of claim 10,
The vent pipe portion,
a first discharge line through which the hydrogen gas discharged from the hydrogen storage tank flows to the compressor of the reliquefaction system; and
and a second discharge line through which the pressurized hydrogen gas discharged from the compressor is transferred to the discharge nozzle unit,
The reliquefaction system,
Characterized in that it further comprises a hydrogen gas distributor controlling to discharge excess hydrogen gas exceeding the hydrogen gas capacity operated in the reliquefaction system to the second discharge line of the vent piping part,
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
12. The method of claim 11,
The pressure of the hydrogen gas discharged to the second discharge line of the vent piping part is a to less than 20 bar, and a is the atmospheric pressure and the seawater pressure according to the distance (H) from the sea level to the discharge nozzle part. characterized in that
Liquid hydrogen storage tank venting device of liquid hydrogen ship.
A liquid hydrogen vessel comprising:
Claims 3 to 8, comprising the liquid hydrogen storage tank vent device according to any one of claims 10 to 12,
liquid hydrogen vessel.

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