WO2021045534A1

WO2021045534A1 - Liquefied gas storage tank and ship including same

Info

Publication number: WO2021045534A1
Application number: PCT/KR2020/011871
Authority: WO
Inventors: 손상훈; 노명현; 김응수
Original assignee: 주식회사 포스코
Priority date: 2019-09-06
Filing date: 2020-09-03
Publication date: 2021-03-11
Also published as: WO2021045534A8; JP7442626B2; KR20210029896A; CN114341543A; JP2022547021A; CN114341543B

Abstract

A liquefied gas storage tank according to an embodiment of the present invention is provided with: a tank unit in which liquefied gas is stored; a pump unit which is installed inside the tank unit, suctions the liquefied gas stored inside the tank unit through an inflow pipe part, and supplies the liquefied gas to the outside; and a backflow prevention unit in through which the liquefied gas flows but from which the liquefied gas is not discharged. The liquefied gas storage tank may comprise an inner box unit provided to surround the vicinity of the inflow pipe part.

Description

Liquefied gas storage tank and ship including the same

The present invention relates to a liquefied gas storage tank and a ship including the same.

In general, petroleum resources used for transportation fuels such as automobiles and ships and various fuels used at home and abroad are gradually depleted, and the use of liquefied gas as an alternative energy is increasing due to rising oil prices and strict environmental regulations.

For example, the liquefied gas includes liquefied natural gas (LNG) or liquefied propane gas (LPG). These liquefied gases have a significantly smaller volume than gaseous (e.g., LNG can reduce the volume to 1/600 when liquefied, and LPG can be reduced to 1/250 when liquefied), so it is convenient for storage and transportation in the liquefied state. There is a difficulty in maintaining the temperature below the boiling point (about -162 ℃ for LNG, about -50 ℃ for LPG).

In order to store such liquefied gas, a cryogenic liquefied gas storage tank that maintains the liquefied gas below the boiling point is required.

However, the liquefied gas storage tank is a structure that stores liquefied fuel of a transportation engine such as a ship, and since liquid is stored therein, it is inevitably a liquefied gas storage tank according to the movement of a floating structure such as a ship or a land transportation engine. Is not always able to be leveled with respect to the water surface or the ground, thereby causing a flow of liquid fuel.

In addition, as the liquid fuel is consumed, the level of the liquefied gas fuel in the liquefied gas storage tank is lowered, and when the above-described inclination of the liquefied gas storage tank occurs, the liquefied gas fuel inside the liquefied gas storage tank is transferred to the outside. There is a problem that the inlet pipe portion of the supplied pump unit is not immersed in the liquefied gas fuel but is removed from it and is exposed to the space of the liquefied gas storage tank.

Accordingly, gas such as vaporized fuel gas is introduced through the inlet pipe, and accordingly, gas is introduced into the configuration of the engine, etc. to which the liquefied gas fuel is to be supplied, causing failure. There is a problem that the engine system of the engine must be shut down.

As a result, the capacity of the liquefied gas storage tank cannot be utilized to the maximum, loss of travel distance, time loss due to frequent fuel injection, and ships due to the fact that the liquefied gas fuel must always be filled to a certain depth or more in the liquefied gas storage tank. As the weight of the transportation engine increases, there is a limit to the reduction in fuel consumption efficiency.

In addition, when a part of the inlet pipe is not immersed in the liquefied gas fuel, but is exposed to the space of the liquefied gas storage tank, it is exposed to a relatively high temperature region, so even if the liquefied gas fuel flows into the inlet pipe, it is vaporized during transport. There is a problem that is transmitted to the outside of the back.

Therefore, in order to solve or improve the above-described problem, a study on a liquefied gas storage tank and a ship including the same is required.

An object of the present invention is to provide a liquefied gas storage tank and a ship including the same, which prevents the problem that the inlet pipe portion of the pump unit is not immersed in the liquefied gas fuel and is exposed to the space of the liquefied gas storage tank.

In another aspect, an object of the present invention is to provide a liquefied gas storage tank and a ship including the same, which prevents the problem that the inlet pipe of the pump unit is exposed to a relatively high temperature space filled with gas of the liquefied gas storage tank.

A liquefied gas storage tank according to an embodiment of the present invention is a tank unit in which liquefied gas is stored, a pump installed inside the tank unit, and sucks the liquefied gas stored in the tank unit through an inlet pipe and supplies it to the outside. It may include a unit and an inner box unit provided with a backflow prevention unit in which the liquefied gas is introduced but not discharged, and is provided to surround the inlet pipe portion.

In addition, the backflow prevention part of the liquefied gas storage tank according to an embodiment of the present invention may include a first flip door provided in the inner box unit to be opened and closed only in one direction.

Here, the first flip door of the liquefied gas storage tank according to an embodiment of the present invention may be characterized in that at least one is provided on an upper wall portion or a side wall portion of the inner box unit.

Specifically, the first flip door of the liquefied gas storage tank according to an embodiment of the present invention has one end hinged to one side of the opening of the inner box unit, and the other end is caught on the inner surface of the inner box unit. It may be provided to be extended so as to be moved in close contact with the inner box unit by elasticity.

In addition, the reverse flow prevention portion of the liquefied gas storage tank according to an embodiment of the present invention, the extended inlet end portion disposed to face the outside of the inner box unit and provided with a first flip door, and the inner box unit. It may include an extension pipe provided with an extended extended discharge end.

Here, the extension pipe of the liquefied gas storage tank according to an embodiment of the present invention is formed in the shape of a curved pipe disposed at a center portion lower in height than the extension inlet end portion, and higher in height than the extension outlet end portion. can do.

In addition, the backflow prevention part of the liquefied gas storage tank according to an embodiment of the present invention is disposed on the side wall of the inner box unit and is provided in the form of a fallopian tube communicating with the outside, and the first flip door is provided at the inner end. It may include an inclined pipe.

In addition, the backflow prevention part of the liquefied gas storage tank according to an embodiment of the present invention includes a differential pressure inlet end extending outward of the inner box unit, and a height lower than the differential pressure inlet end extending into the inner box unit. It may include a differential pressure pipe provided with a differential pressure discharge end disposed as.

In addition, the liquefied gas storage tank according to an embodiment of the present invention may include a low temperature maintenance unit provided to be in contact with at least the inlet pipe portion, and containing the liquefied gas therein.

Here, the low temperature maintenance unit of the liquefied gas storage tank according to an embodiment of the present invention is provided to communicate with the inside of the inner box unit by inserting the inlet pipe portion, and includes an insertion cylinder portion in contact with the inlet pipe portion. I can.

Specifically, the insertion cylinder part of the liquefied gas storage tank according to an embodiment of the present invention includes an inner pipe part in contact with the inlet pipe part and a predetermined distance from the inner pipe part to receive the liquefied gas, and one end thereof is the inner pipe part. It may include an exterior portion combined with.

In addition, the insertion cylinder part of the liquefied gas storage tank according to an embodiment of the present invention may be extended to the outside of the inner box unit, but may be extended upward, and the upper end may be opened.

In addition, the low temperature maintenance unit of the liquefied gas storage tank according to an embodiment of the present invention is in communication with an upper end of the insertion cylinder and extends to an upper wall portion of the inner box unit or an upper wall portion and a side wall portion of the inner box unit, It may include a double wall portion provided with a second flip door that opens and closes only in one direction so that the liquefied gas is introduced into the interior.

In addition, the inner box unit of the liquefied gas storage tank according to an embodiment of the present invention may be characterized in that it shares at least one side wall portion with a support member provided inside the tank unit.

Here, the inner box unit of the liquefied gas storage tank according to an embodiment of the present invention may be characterized in that a side wall portion coupled between the support members is provided to extend upwardly than an upper wall portion.

A ship according to another embodiment of the present invention may include a hull including an engine unit provided with the liquefied gas storage tank and the liquefied gas storage tank and provides driving force.

In the liquefied gas storage tank of the present invention and a ship including the same, the inlet pipe portion of the pump unit is not immersed in the liquefied gas fuel, and there is an advantage of preventing the problem of being exposed to the space of the liquefied gas storage tank.

In another aspect, the liquefied gas storage tank of the present invention and a ship including the same have an advantage of preventing the problem of being exposed to a relatively high temperature space filled with gas of the liquefied gas storage tank in the inlet pipe portion of the pump unit.

Accordingly, there is an effect of preventing a problem in which gas is introduced into a configuration such as an engine to which the liquefied gas fuel is to be supplied, thereby preventing a problem in which the engine unit is stopped while the ship is moving.

In addition, the capacity of the liquefied gas storage tank can be utilized to the maximum, thereby increasing the operating distance, preventing time loss due to frequent fuel injection, and the liquefied gas storage tank must be always filled with liquefied gas fuel to a certain depth or more. There is an effect of improving the problem of reducing fuel consumption efficiency by increasing the weight of the ship.

However, various and beneficial advantages and effects of the present invention are not limited to the above-described contents, and may be more easily understood in the course of describing specific embodiments of the present invention.

1 is a front view showing a liquefied gas storage tank of the present invention.

2 is a front view showing a state in which the liquefied gas storage tank of the present invention is inclined.

3 is a front view and a plan view showing a portion of the inner box unit in the liquefied gas storage tank of the present invention.

4 is a front view and a plan view showing an embodiment in which a first flip door is provided on an upper wall of an inner box unit in the liquefied gas storage tank of the present invention.

5 is a front view and a side view showing an embodiment in which the inner box unit shares the support member and the side wall portion in the liquefied gas storage tank of the present invention.

6 is a front view showing an embodiment in which the sidewall portion of the inner box unit is formed with an extension in the liquefied gas storage tank of the present invention.

7 is a front view showing an embodiment in which a differential pressure pipe is provided in the inner box unit in the liquefied gas storage tank of the present invention.

8 is a front view showing an embodiment in which an extension pipe is provided in the inner box unit in the liquefied gas storage tank of the present invention.

9 is a front view showing an embodiment in which a plurality of first flip doors are provided on the side wall of the inner box unit in the liquefied gas storage tank of the present invention.

10 is a front view showing an embodiment in which an inclined pipe is provided on a side wall portion of the inner box unit in the liquefied gas storage tank of the present invention.

11 is a front view showing an embodiment provided with a low temperature maintenance unit in the liquefied gas storage tank of the present invention.

12 is a front view showing an embodiment in which the low temperature maintenance unit extends to the side wall in the liquefied gas storage tank of the present invention.

13 is a front view showing an embodiment in which only an insertion cylinder part is provided in the low temperature maintenance unit in the liquefied gas storage tank of the present invention.

14 is a side view showing a liquefied gas storage tank and a ship including the same according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided in order to more completely explain the present invention to those with average knowledge in the art. In the drawings, the shapes and sizes of elements may be exaggerated for clearer explanation.

In addition, expressions in the singular in this specification include a plurality of expressions unless clearly defined otherwise in the context, and reference numerals given in the same reference numerals or in a similar manner throughout the specification refer to the same or corresponding elements. It should be done.

The present invention relates to a liquefied gas storage tank (1) and a ship including the same, while the inner box unit (300) surrounds the inlet pipe portion (210) of the pump unit (200) and the liquefied gas (L) is introduced but not discharged. By providing the non-return preventing part 310, the inlet pipe part 210 is not immersed in the liquefied gas (L) fuel, but it is possible to prevent the problem of being exposed to the space of the liquefied gas storage tank 1, and other From the side, by including the low temperature maintenance unit 400, it is possible to prevent a problem in which the inlet pipe part 210 is exposed to a relatively high temperature space filled with gas of the liquefied gas storage tank 1.

Thereby, it is possible to prevent the problem that the gas flows into the configuration of the engine to which the liquefied gas (L) fuel is to be supplied and fails, thereby preventing the problem that the engine unit 2a is stopped while the ship is moving, and also liquefied. It is possible to utilize the capacity of the gas storage tank 1 to the maximum, thereby improving the problem of increasing the operating distance, preventing time loss due to frequent fuel injection, and reducing fuel consumption efficiency due to an increase in the weight of the ship. .

Specifically, referring to the drawings, FIG. 1 is a front view showing a liquefied gas storage tank 1 of the present invention, and FIG. 2 is a front view showing an inclined state of the liquefied gas storage tank 1 of the present invention. 3 is a front view and a plan view showing a portion of the inner box unit 300 in the liquefied gas storage tank 1 of the present invention, and FIG. 4 is an inner box unit 300 in the liquefied gas storage tank 1 of the present invention. ) Is a front view and a plan view showing an embodiment in which one first flip door 311 is provided on the upper wall part 320. 9 is a front view showing an embodiment in which a plurality of first flip doors 311 are provided on the side wall portion 330 of the inner box unit 300 in the liquefied gas storage tank 1 of the present invention.

Referring to the drawings, the liquefied gas storage tank 1 according to an embodiment of the present invention is a tank unit 100 in which liquefied gas L is stored, and is installed inside the tank unit 100, and the tank unit (100) A pump unit 200 that sucks the liquefied gas (L) stored inside and supplies it to the outside by sucking the liquefied gas (L) through the inlet pipe part 210 and a backflow prevention part 310 where the liquefied gas (L) is introduced but not discharged Is provided, and may include an inner box unit 300 provided to surround the inlet pipe part 210.

In this way, the liquefied gas storage tank 1 of the present invention is provided to surround the inlet pipe 210 of the pump unit 200, but accommodates the liquefied gas L in one-way. , As the liquefied gas (L) fuel is used in the tank unit 100, the water level is lowered, or the liquefied gas (L) is inclined by the liquefied gas storage tank 1 due to sloshing of a ship, etc. ) Even if the fuel is biased toward one side, it is possible to fill the vicinity of the inlet pipe part 210 with liquefied gas (L) fuel.

The tank unit 100 is a configuration capable of storing cryogenic liquefied gas (L) such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG), and is generally provided by being combined with the hull 2 of a ship. Can be.

Here, in the case where the liquefied gas (L) is stored, an insulating material is coupled to the outer surface of the tank unit 100 to ensure heat insulation of the liquefied gas (L),

In addition, the tank unit 100 may be provided with a support member 110 therein to store the liquefied gas (L) of the internal high pressure, such a support member 110 is the circumference of the tank unit 100 It may be provided in a ring shape in the direction. For example, the support member 110 may be provided in the form of a disk having a hole formed therein.

The pump unit 200 serves to deliver the liquefied gas (L) fuel inside the tank unit 100 to the outside.

However, in order for the pump unit 200 to deliver the liquefied gas (L) fuel to the outside, the inlet pipe part 210 of the pump unit 200 must be provided by being immersed in the liquefied gas (L). When a phenomenon occurs, conventionally, there is a problem that the inlet pipe part 210 is not immersed in the liquefied gas (L) fuel, but is exposed to the gas space of the liquefied gas storage tank 1. By providing the unit 300, it is possible to improve this problem.

Here, the inlet pipe part 210 passes through the upper surface of the tank unit 100 and is connected to the outside and extends into the inside of the tank unit 100, or passes through the bottom part of the tank unit 100 and is connected to the outside. As a result, the tank unit 100 may be extended into the inside of the tank unit 100, and may also be connected to the outside through a sidewall of the tank unit 100 to extend into the inside of the tank unit 100.

The inner box unit 300 serves to fill the periphery of the inlet pipe part 210 with the liquefied gas (L) fuel. To this end, the inner box unit 300 is provided in the form of a container surrounding the inlet pipe part 210, and includes a backflow prevention part 310 through which the liquefied gas L is introduced but not discharged.

An example of such a backflow prevention part 310 may include a flip-type first flip door 311 that opens only in one direction.

That is, the backflow prevention part 310 of the liquefied gas storage tank 1 according to an embodiment of the present invention is provided in the inner box unit 300, the first flip door provided to be opened and closed only in one direction. (311) may be included.

In other words, the first flip door 311 may be configured to seal the opened area of the inner box unit 300, but the liquefied gas L may be configured to move open in the inflow direction.

Specifically, the first flip door 311 of the liquefied gas storage tank 1 according to an embodiment of the present invention has one end hinged to one side of the opening of the inner box unit 300, and the other end It is provided to extend so as to be caught on the inner surface of the inner box unit 300, but may be characterized in that it moves in close contact with the inner box unit 300 by elasticity.

That is, when the first flip door 311 is pushed to move the liquefied gas L from the inside of the inner box unit 300 to the outside, it is moved to close the opened area of the inner box unit 300 , Whereas the liquefied gas L is moved from the outside of the inner box unit 300 to the inside of the inner box unit 300 while not being driven to be opened anymore, the first flip door 311 is connected to the inner When pushed toward the inside of the box unit 300, it is rotated and driven to open.

At this time, the first flip door 311 may be provided at one end portion hinged with the inner box unit 300 with a spring member or the like having an elastic force acting outward.

Here, the first flip door 311 of the liquefied gas storage tank 1 according to an embodiment of the present invention is at least one on the upper wall portion 320 or the side wall portion 330 of the inner box unit 300 It may be characterized in that it is provided.

In other words, the opened opening through which the liquefied gas L is introduced into the inner box unit 300 may be formed in the side wall portion 330 as well as the upper wall portion 320 of the inner box unit 300. The number can be singular or plural. As described above, the first flip door 311 is installed in an opening formed in at least one of the upper wall part 320 and the side wall part 330 so that the liquefied gas L is accommodated only by the inner box unit 300. Can be configured.

In addition, the inner box unit 300 is configured to seal the periphery of the inlet pipe part 210 when the first flip door 311 is closed. In this case, the inner box unit 300 is liquefied. When the gas L is vaporized due to a temperature increase or the like, since it is vaporized in a sealed region, it cannot be vaporized more than a certain amount. Accordingly, it is possible to improve the vaporization problem of the liquefied gas (L).

5 is a front view and a side view showing an embodiment in which the inner box unit 300 shares the support member 110 and the side wall portion 330 in the liquefied gas storage tank 1 of the present invention, and FIG. 6 is In the liquefied gas storage tank 1 of the present invention, the side wall portion 330 of the inner box unit 300 is a front view showing an embodiment in which the extension portion 330a is formed.

Referring to the drawings, the inner box unit 300 of the liquefied gas storage tank 1 according to an embodiment of the present invention includes a support member 110 provided inside the tank unit 100 and at least one side wall. It may be characterized by sharing the unit 330.

Accordingly, as the inner box unit 300 is provided, the problem of increasing the weight of the liquefied gas storage tank 1 can be improved.

In addition, since it is provided integrally with the support member 110 coupled to the tank unit 100, it is possible to further increase the coupling force of the inner box unit 300.

Here, in the inner box unit 300 of the liquefied gas storage tank 1 according to an embodiment of the present invention, the side wall portion 330 coupled between the support member 110 is higher than the upper wall portion 320. It may be characterized in that it is provided to be extended.

That is, in addition to the side wall portion 330 replaced by the support member 110, the remaining side wall portion 330 provided in addition to the upper wall portion 320 is configured to include an extension portion 330a that extends further upward than the upper wall portion 320. It can be.

According to this, even when the liquefied gas L inside the tank unit 100 flows due to fluctuations, etc., the surrounding of the inner box unit 300 serves as a breakwater member so as not to be affected by the flow of the liquefied gas L. Will do.

Accordingly, the inflow of the liquefied gas L into the inner box unit 300 can be stably performed.

7 is a front view showing an embodiment in which a differential pressure pipe 314 is provided in the inner box unit 300 in the liquefied gas storage tank 1 of the present invention. Accordingly, the backflow prevention part 310 of the liquefied gas storage tank 1 has a differential pressure inlet end 314a extending outward of the inner box unit 300 and extending into the inner box unit 300. A differential pressure pipe 314 having a differential pressure discharge end 314b disposed at a height lower than the differential pressure inlet end 314a may be included.

In this way, since the backflow prevention part 310 includes the differential pressure pipe 314, the liquefied gas L can be configured to flow into the inner box unit 300 but not be discharged.

That is, provided to surround the inlet pipe part 210, but by receiving the liquefied gas (L) in one direction, the liquefied gas (L) fuel is removed to one side by the inclination of the tank unit 100 Even if it loses, it is possible to fill the vicinity of the inlet pipe part 210 with liquefied gas (L) fuel.

This differential pressure pipe 314 is because the differential pressure discharge end 314b disposed inside the inner box unit 300 is positioned lower than the differential pressure inlet end 314a disposed outside the inner box unit 300 The liquefied gas L can be moved to the inner box unit 300 due to the difference in pressure.

That is, the height of the central portion of the differential pressure pipe 314 is not considered, and only the heights of both ends of the differential pressure pipe 314 determine the flow direction of the liquefied gas L. Since it is higher than the differential pressure discharge end 314b, the liquefied gas L flows from the differential pressure inlet end 314a to the differential pressure discharge end 314b.

8 is a front view showing an embodiment in which an extension pipe 312 is provided in the inner box unit 300 in the liquefied gas storage tank 1 of the present invention. The reverse flow prevention part 310 of the liquefied gas storage tank 1 according to the above is disposed to face the outside of the inner box unit 300, and an extended inlet end 312a provided with a first flip door 311, It may include an extension pipe 312 provided with an extension discharge end 312b extending into the inner box unit 300.

That is, since the extension pipe 312 is provided with the first flip door 311 at the extension inlet end 312a, the liquefied gas L flows into the inner box unit 300, It can be configured so that it cannot be deviated from the outside.

Moreover, since the extension pipe 312 is extended into the inner box unit 300, the liquefied gas L accommodated in the inner box unit 300 is discharged from the extended discharge end 312b. It is possible to increase the path moving in the direction of the extended inflow end 312a. Accordingly, it is possible to more effectively prevent a problem in which the liquefied gas L in the inner box unit 300 is separated to the outside through the first flip door 311.

Here, the extension pipe 312 of the liquefied gas storage tank 1 according to an embodiment of the present invention is disposed at a lower height than the extension inlet end 312a at the center, and is higher than the extension discharge end 312b. It may be characterized in that it is formed in the shape of a curved tube that is arranged high in height.

That is, when the extension pipe 312 is in a curved tube shape than when in a straight shape, the movement path of the liquefied gas L can be further increased, so that the liquefied gas L can be more effectively prevented from leaving. .

10 is a front view showing an embodiment in which an inclined pipe 313 is provided on the side wall portion 330 in the inner box unit 300 in the liquefied gas storage tank 1 of the present invention. The backflow prevention part 310 of the liquefied gas storage tank 1 according to an embodiment of the present invention is disposed on the sidewall part 330 of the inner box unit 300 and is provided in the form of a fallopian tube communicating with the outside, An inclined pipe 313 provided with the first flip door 311 may be included at the inner end 313a.

In other words, since the inclined pipe 313 is also provided with the first flip door 311 at the inner end 313a, the liquefied gas L flows into the inner box unit 300, It can be configured so that it cannot be deviated from the outside.

In addition, the inclined pipe 313 is configured to increase in width from the inner end 313a to the outer end, whereby the liquefied gas L accommodated in the inner box unit 300 is removed to the outside. Since it must pass through a relatively narrow area, it is possible to increase the effect of preventing separation from the outside, and when the liquefied gas L is accommodated into the inner box unit 300 from the outside of the inner box unit 300 Since it only needs to pass through a relatively large area, there is an effect of more easily accommodating the liquefied gas (L).

11 is a front view showing an embodiment in which a low temperature maintenance unit 400 is provided in the liquefied gas storage tank 1 of the present invention, and FIG. 12 is a low temperature maintenance unit 400 in the liquefied gas storage tank 1 of the present invention. ) Is a front view showing an embodiment extended to the side wall portion 330, FIG. 13 is an embodiment in which only the insertion cylinder portion 410 is provided in the low temperature maintenance unit 400 in the liquefied gas storage tank 1 of the present invention It is a front view showing.

Referring to the drawings, a low-temperature maintenance unit provided to be in contact with at least the inlet pipe part 210 of the liquefied gas storage tank 1 according to an embodiment of the present invention, and the liquefied gas L is contained therein ( 400).

That is, the liquefied gas storage tank 1 of the present invention can maintain the inlet pipe part 210 at a low temperature by providing the low temperature maintenance unit 400, thereby moving through the inlet pipe part 210 It is possible to prevent the problem that the liquefied gas L is vaporized due to an increase in temperature.

In other words, even if the inlet pipe portion 210 may be filled with the liquefied gas (L) by the inner box unit 300, the liquefaction received in the inner box unit 300 through the inlet pipe portion 210 When the gas L is discharged to the outside, a relatively high temperature gas region may also be formed around the inlet pipe part 210. In this case, the liquefied gas L that has been moved through the inlet pipe part 210 is vaporized. Since a problem may occur, the low temperature maintenance unit 400 is provided.

Specifically, the low temperature maintenance unit 400 of the liquefied gas storage tank 1 according to an embodiment of the present invention is provided to communicate with the inside of the inner box unit 300 by inserting the inlet pipe part 210 However, it may include an insertion cylinder part 410 in contact with the inlet pipe part 210.

In other words, the low temperature maintenance unit 400 includes the insertion cylinder part 410 which is in contact with the inlet pipe part 210 and accommodates a relatively low temperature liquefied gas L therein.

For example, the liquefied gas (L) may include liquefied natural gas (LNG) or liquefied propane gas (LPG), and the liquefied natural gas has a boiling point of about -162 °C. In the case of the liquefied propane gas, since the boiling point is about -50 °C, the inlet pipe part 210 can be maintained at about -162 °C and about -50 °C, respectively.

To this end, the insertion cylinder part 410 may include an inner tube part 411 and an exterior part 412. The insertion cylinder part 410 of the liquefied gas storage tank 1 according to an embodiment of the present invention is spaced apart from the inner pipe part 411 in contact with the inlet pipe part 210 and the inner pipe part 411 at a predetermined interval. The liquefied gas (L) may be accommodated, and an outer end portion 412 may be coupled to the inner tube portion 411.

Here, the inner pipe part 411 is in contact with the inlet pipe part 210 inserted therein, and a space is formed between the inner pipe part 411 and the outer part 412 to accommodate the liquefied gas (L). There will be.

That is, the inner pipe part 411 and the outer part 412 have a double pipe structure, and the lower part is combined with each other to have a structure capable of receiving the liquefied gas L without escaping.

In addition, since the upper end of the insertion cylinder 410 is extended to the outside of the inner box unit 300 to be positioned above the inner box unit 300, the upper end of the insertion cylinder 410 is formed in an open form, The liquefied gas (L) is accommodated therein, but the surroundings of the inlet pipe part 210 can be maintained in a low temperature environment.

That is, the insertion cylinder part 410 of the liquefied gas storage tank 1 according to an embodiment of the present invention extends to the outside of the inner box unit 300 but extends upward, and has an open upper end. It can be characterized by that.

In this embodiment, it is possible to accommodate the liquefied gas L without separately providing a first flip door 311 or the like at the upper end of the insertion cylinder part 410. For this, reference may be made to FIG. 13.

However, if the first flip door 311 for moving the liquefied gas L in only one direction can be provided at the upper end of the insertion cylinder, it may be provided.

And, the low temperature maintenance unit 400 of the liquefied gas storage tank 1 according to an embodiment of the present invention is in communication with the upper end of the insertion cylinder 410, the upper wall of the inner box unit 300 ( 320) or a second flip door 421 that extends to the upper wall portion 320 and the side wall portion 330 of the inner box unit 300 and opens and closes in only one direction so that the liquefied gas L flows into the interior. It may include a double wall portion 420 is provided.

In addition to forming the inlet pipe part 210 in a low-temperature environment, the double-wall part 420 has an effect of forming the outer part of the inner box unit 300 in a low-temperature environment.

Accordingly, it is possible to improve a problem in which the liquefied gas L accommodated in the inner box unit 300 is exposed to a high temperature environment and vaporized.

In other words, the double wall portion 420 may be provided on the upper wall portion 320 of the inner box unit 300 and may be formed in a "b" shape when viewed in a front cross-sectional view. For this, reference may be made to FIG. 11.

According to this, in addition to being able to arrange liquefied gas (L) in order to maintain the inlet pipe part 210 in a low temperature environment by the insertion cylinder part 410, the upper wall part 320 of the inner box unit 300 Liquefied gas (L) can also be placed in order to keep the) in a low-temperature environment.

In addition, the double wall portion 420 may be provided on the upper wall portion 320 and the side wall portion 330 of the inner box unit 300 and may be formed in an "n" shape when viewed in a front cross-sectional view. For this, reference may be made to FIG. 12.

According to this, in addition to being able to arrange liquefied gas (L) in order to maintain the inlet pipe part 210 in a low temperature environment by the insertion cylinder part 410, the upper wall part 320 of the inner box unit 300 ) And the liquefied gas (L) may be disposed in order to maintain the sidewall portion 330 in a low-temperature environment.

Here, in order to accommodate the liquefied gas (L) in the double wall portion 420, the double wall portion 420 may be a double plate having a space therein, and the outer portion of the insertion cylinder portion 410 ( It may be connected to be in communication with the space between the 412 and the inner tube part 411.

In addition, in order to receive the liquefied gas L into the double wall part 420, a second flip door 421 is provided on the upper surface to transfer the liquefied gas L into the double wall part 420. However, it may be configured to prevent it from being moved to the outside.

14 is a side view showing a liquefied gas storage tank 1 and a ship including the same according to the present invention, and referring to the drawings, a ship according to another embodiment of the present invention includes the liquefied gas storage tank 1 and the The liquefied gas storage tank 1 is installed and may include a hull 2 including an engine unit 2a providing driving force.

That is, because the vessel includes the above-described liquefied gas storage tank 1, the water level is lowered or the ship is slanted as the liquefied gas (L) fuel is used in the tank unit 100. Even if the liquefied gas (L) fuel is shifted to one side due to the inclination of the liquefied gas storage tank 1 due to the inclination of the liquefied gas (L) fuel, it is possible to fill the periphery of the inlet pipe part 210 with liquefied gas (L) fuel, ), it is possible to stably supply the liquefied gas (L) as fuel.

In addition, by maintaining the periphery of the inlet pipe part 210 in a low-temperature environment, it is possible to prevent vaporization of the liquefied gas L moving through the inlet pipe part 210.

Accordingly, it is possible to prevent a problem in which gas is introduced into a configuration such as an engine to which the liquefied gas (L) fuel is to be supplied, thereby preventing a problem that the engine unit 2a is stopped while the ship is moving, and also the liquefied gas It is possible to utilize the capacity of the storage tank 1 to the maximum, thereby improving the problem of increasing the operating distance, preventing time loss due to frequent fuel injection, and reducing fuel consumption efficiency due to an increase in the weight of the ship.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary knowledge.

Claims

A tank unit for storing liquefied gas;

A pump unit installed inside the tank unit and suctioning the liquefied gas stored in the tank unit through an inlet pipe and supplying it to the outside; And

An inner box unit provided with a backflow prevention part through which the liquefied gas is introduced but not discharged, and is provided to surround the inlet pipe part;

Liquefied gas storage tank comprising a.
The method of claim 1,

The backflow prevention part,

A first flip door provided in the inner box unit to be opened and closed only in one direction;

Liquefied gas storage tank comprising a.
The method of claim 2,

The liquefied gas storage tank, wherein at least one of the first flip doors is provided on an upper wall portion or a side wall portion of the inner box unit.
The method of claim 2,

The first flip door has one end hingedly coupled to one side of the opening of the inner box unit, and the other end is provided to extend so as to be caught on the inner surface of the inner box unit, but moves in close contact with the inner box unit by elasticity Liquefied gas storage tank, characterized in that the.
The method of claim 2,

The backflow prevention part,

An extension pipe disposed to face the outside of the inner box unit and having an extended inlet end having a first flip door and an extended discharge end extending into the inner box unit;

Liquefied gas storage tank comprising a.
The method of claim 5,

The extension pipe is a liquefied gas storage tank, characterized in that formed in the shape of a curved pipe is disposed at a height lower than the extension inlet end portion in the central portion, the height is arranged higher than the extension discharge end portion.
The method of claim 2,

The backflow prevention part,

An inclined pipe disposed on a side wall of the inner box unit, provided in the form of a fallopian tube communicating with the outside, and having the first flip door at an inner end thereof;

Liquefied gas storage tank comprising a.
The method of claim 1,

The backflow prevention part,

A differential pressure pipe having a differential pressure inlet end extending outward of the inner box unit and a differential pressure outlet end extending into the inner box unit and disposed at a height lower than the differential pressure inlet end;

Liquefied gas storage tank comprising a.
The method of claim 1,

A low temperature maintenance unit provided to be in contact with at least the inlet pipe part and containing the liquefied gas therein;

Liquefied gas storage tank comprising a.
The method of claim 9,

The low temperature maintenance unit,

An insertion cylinder part which is provided to communicate with the inside of the inner box unit by inserting the inlet pipe part, and which is in contact with the inlet pipe part;

Liquefied gas storage tank comprising a.
The method of claim 10,

The insertion cylinder part,

An inner pipe portion in contact with the inlet pipe portion; And

An outer portion spaced apart from the inner pipe portion to receive the liquefied gas, and one end portion coupled to the inner pipe portion;

Liquefied gas storage tank comprising a.
The method of claim 10,

The insertion cylinder portion, the liquefied gas storage tank, characterized in that the form extending to the outside of the inner box unit, extending upwardly, and an upper end portion of which is open.
The method of claim 10,

The low temperature maintenance unit,

A second flip door communicating with the upper end of the insertion cylinder unit and extending to the upper wall of the inner box unit or to the upper and side walls of the inner box unit, and opening and closing in only one direction so that the liquefied gas is introduced into the interior is provided. Double wall portion;

Liquefied gas storage tank comprising a.
The method of claim 1,

The inner box unit, a liquefied gas storage tank, characterized in that the shared support member and at least one side wall portion provided in the tank unit.
The method of claim 14,

The inner box unit is a liquefied gas storage tank, characterized in that the side wall portion coupled between the support member is provided to extend upward than the upper wall portion.
The liquefied gas storage tank of any one of claims 1 to 15; And

A hull having an engine unit provided with the liquefied gas storage tank and providing a driving force;

Ships containing.