JP2022547021A - Liquefied gas storage tanks and vessels containing them - Google Patents

Abstract

A liquefied gas storage tank according to an embodiment of the present invention comprises a tank unit for storing liquefied gas, and a tank unit provided inside the tank unit to suck the liquefied gas stored inside the tank unit through an inflow pipe portion. and an inner box unit provided with a backflow prevention part to prevent the liquefied gas from flowing in and out, and surrounding the inflow pipe part.

Description

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

Petroleum resources, which are generally used for transportation fuels such as automobiles and ships, and various fuels used in Japan and overseas, are gradually depleting. Usage is increasing.

As an example, the liquefied gas includes liquefied natural gas (LNG) or liquefied propane gas (LPG). Such a liquefied gas has a significantly reduced volume compared to the gaseous state (e.g., LNG can be reduced in volume by 1/600 when liquefied, and LPG can be significantly reduced by 1/250 when liquefied). Therefore, it is convenient for storage and transportation in a liquefied state, but there is a difficulty that the temperature must be maintained below the boiling point (about -162 ° C. for LNG, about -50 ° C. for LPG).

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

By the way, the liquefied gas storage tank is a structure for storing liquefied fuel for a transport vehicle such as a ship, and liquid is stored therein. As a result, the movement of floating structures such as ships or land transportation means that the liquefied gas storage tank will inevitably become unable to maintain horizontality with respect to the surface of the water or the ground, thereby restricting the flow of liquid fuel. Occur.

In addition, as the liquid fuel is consumed, the water level of the liquefied gas fuel inside the liquefied gas storage tank decreases, and when the liquefied gas storage tank tilts as described above, the liquefied gas fuel inside the liquefied gas storage tank is released to the outside. There is a problem that the inflow pipe part of the pump unit to be supplied is not immersed in the liquefied gas fuel and is detached from the liquefied gas fuel and exposed to the space of the liquefied gas storage tank.

As a result, gas such as vaporized fuel gas flows in through the inflow pipe portion, and the gas flows into a structure such as an engine to which the liquefied gas fuel is to be supplied, causing malfunction. In order to prevent such a situation, there is a problem that it is necessary to stop the engine system of the transportation facility.

Therefore, the capacity of the liquefied gas storage tank cannot be utilized to the maximum, resulting in loss of operating distance, loss of time due to frequent fuel injection, and the need to always fill the liquefied gas storage tank with liquefied gas fuel to a certain depth or more. The limitation is that the weight of the vehicle increases and the fuel consumption efficiency decreases.

In addition, when a part of the inflow pipe is not immersed in the liquefied gas fuel and is exposed to the space of the liquefied gas storage tank, the liquefied gas fuel is exposed to a relatively high temperature region. Even if it flows in, there is a problem that it evaporates during transfer and is transmitted to the outside such as the engine.

Therefore, research into liquefied gas storage tanks and ships including the same has become necessary in order to solve or improve the above-mentioned problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquefied gas storage tank and a ship including the same that prevent the inflow pipe of a pump unit from being immersed in the liquefied gas fuel and being exposed to the space of the liquefied gas storage tank. and

In another aspect, the present invention provides a liquefied gas storage tank and a ship including the same that prevent the problem of the inlet pipe of the pump unit being exposed to the gas-filled relatively high temperature space of the liquefied gas storage tank. With the goal.

A liquefied gas storage tank according to an embodiment of the present invention comprises a tank unit for storing liquefied gas, and a tank unit provided inside the tank unit to suck the liquefied gas stored inside the tank unit through an inflow pipe portion. and an inner box unit provided with a backflow prevention part to prevent the liquefied gas from flowing in and out, and surrounding the inflow pipe part.

Also, 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 and opened and closed in one direction only.

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

Specifically, one end of the first flip door of the liquefied gas storage tank according to an embodiment of the present invention is hinged to one side of the opening of the inner box unit, and the other end is hinged to the inner box unit. It can be characterized by being extended so as to be hooked on the inner surface of the unit and moving in close contact with the inner box unit due to its elasticity.

The backflow prevention part of the liquefied gas storage tank according to an embodiment of the present invention is arranged to face the outside of the inner box unit, and has an extended inflow end provided with a first flip door and the inner box unit. An extension pipe with an extended discharge end extending into the interior of the box unit may be included.

Here, the extension pipe of the liquefied gas storage tank according to one embodiment of the present invention is arranged in the central part with a height lower than that of the extension inflow end but higher than that of the extension discharge end. It can be characterized by being formed in a bent tube shape that is arranged high.

Further, the backflow prevention part of the liquefied gas storage tank according to the embodiment of the present invention is disposed on the side wall part of the inner box unit and has a trumpet shape communicating with the outside. It can include an inclined pipe with a door.

The backflow prevention part of the liquefied gas storage tank according to an embodiment of the present invention includes a differential pressure inflow end extending outside the inner box unit and a differential pressure inflow end extending inside the inner box unit. A differential pressure pipe may be included with a differential pressure outlet end positioned at a lower elevation than the pressure inlet end.

Further, according to an embodiment of the present invention, the liquefied gas storage tank may include a low temperature maintenance unit that is provided to contact at least the inflow pipe portion and that accommodates the liquefied gas therein.

Here, the low temperature maintenance unit of the liquefied gas storage tank according to one embodiment of the present invention is provided to communicate with the inside of the inner box unit through which the inflow pipe is inserted, and is in contact with the inflow pipe. It can include an insertion cylinder portion that is inserted into the body.

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 inflow pipe part and spaced apart from the inner pipe part by a predetermined distance to store the liquefied gas. and an outer tube portion having one end coupled to the inner tube portion.

Further, the insertion cylinder part of the liquefied gas storage tank according to an embodiment of the present invention is characterized in that it extends outwardly from the inner box unit and extends upward, and has an open upper end. can do.

Further, the low temperature maintenance unit of the liquefied gas storage tank according to one embodiment of the present invention is communicated with the upper end of the insertion cylinder part and is connected to the upper wall part of the inner box unit or the upper wall part of the inner box unit and the upper wall part of the inner box unit. It may include a double wall portion extending from the side wall portion and provided with a second flip door that opens and closes only in one direction to allow the liquefied gas to flow therein.

Further, the inner box unit of the liquefied gas storage tank according to an embodiment of the present invention may share at least one side wall 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 is characterized in that the side wall portion coupled between the support members extends upward from the upper wall portion. can do.

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

The liquefied gas storage tank and the ship including the same according to the present invention have the advantage of preventing the inflow pipe of the pump unit from being immersed in the liquefied gas fuel and being exposed to the space of the liquefied gas storage tank. be.

In another aspect, the liquefied gas storage tank and ship including the same of the present invention can prevent the problem of the inflow pipe portion of the pump unit being exposed to the gas-filled relatively hot space of the liquefied gas storage tank. There are advantages to be had.

As a result, it is possible to prevent the gas from flowing into the structure of the engine to which the liquefied gas fuel is to be supplied, and to prevent the engine from stopping during movement of the ship.

In addition, the capacity of the liquefied gas storage tank can be used to the maximum, which increases the operating distance, prevents time loss due to frequent fuel injection, and liquefied gas fuel is always filled to a certain depth or more inside the liquefied gas storage tank. This has the effect of improving the problem that the fuel consumption efficiency is reduced due to the weight increase of the ship due to necessity.

However, various but significant advantages and effects of the present invention are not limited to the above description, and can be more easily understood in the process of describing specific embodiments of the present invention.

1 is a front view showing a liquefied gas storage tank of the present invention; FIG. FIG. 4 is a front view showing a state in which the liquefied gas storage tank of the present invention is tilted; FIG. 4 is a front view and a plan view showing the inner box unit portion of the liquefied gas storage tank of the present invention; FIG. 4 is a front view and a plan view showing an embodiment in which the inner box unit of the liquefied gas storage tank of the present invention is provided with one first flip door on the upper wall. FIG. 4A is a front view and a side view showing an embodiment in which the inner box unit of the liquefied gas storage tank of the present invention shares a supporting member and a side wall. FIG. 4 is a front view showing an embodiment in which the side walls of the inner box unit of the liquefied gas storage tank of the present invention form extensions; FIG. 4 is a front view showing an embodiment in which the inner box unit of the liquefied gas storage tank of the present invention is provided with a differential pressure pipe; FIG. 4 is a front view showing an embodiment in which an inner box unit of the liquefied gas storage tank of the present invention is provided with an extension pipe; FIG. 4 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 of the liquefied gas storage tank of the present invention; FIG. 4 is a front view showing an embodiment in which the inner box unit of the liquefied gas storage tank of the present invention is provided with inclined pipes on the side walls thereof; FIG. 3 is a front view showing an embodiment in which the liquefied gas storage tank of the present invention is equipped with a low temperature maintenance unit; Fig. 2 is a front view showing an embodiment in which the low temperature maintenance unit of the liquefied gas storage tank of the present invention extends to the side wall; FIG. 4 is a front view showing an embodiment in which only the insertion cylinder part is provided in the low temperature maintenance unit of the liquefied gas storage tank of the present invention; 1 is a side view of a liquefied gas storage tank and a ship including the same according to the present invention; FIG.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Embodiments of the invention may, however, be morphed into several other forms and the scope of the invention should not be limited to the embodiments described below. Moreover, embodiments of the present invention are provided so that the present invention may be more fully understood by those of average skill in the art. Therefore, the shapes and sizes of elements in the drawings may be enlarged or reduced (or emphasized or simplified) for clearer explanation.

Further, singular references herein include plural references unless the context clearly indicates otherwise, and like reference signs or reference signs given in a similar manner throughout the specification refer to the same or corresponding components.

The present invention relates to a liquefied gas storage tank 1 and a ship including the same, and an inner box unit 300 surrounds an inflow pipe portion 210 of a pump unit 200, and a backflow prevention portion 310 that prevents liquefied gas L from flowing in but not being discharged. can prevent the inflow pipe part 210 from being immersed in the fuel of the liquefied gas L and detached from it to be exposed to the space of the liquefied gas storage tank 1. In another aspect, the low temperature maintenance unit By including 400, the problem that the inlet pipe part 210 is exposed to the gas-filled relatively high temperature space of the liquefied gas storage tank 1 can be prevented.

As a result, it is possible to prevent the problem of the gas flowing into the structure of the engine or the like to which the fuel of the liquefied gas L is to be supplied, causing a failure, and the problem of the engine section 2a stopping during movement of the ship. It is possible to maximize the capacity of the liquefied gas storage tank 1, thereby increasing the operating distance, preventing time loss due to frequent fuel injection, and improving the problem of reduced fuel consumption efficiency due to increased weight of the ship. become.

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 shows a tilted state of the liquefied gas storage tank 1 of the present invention. 3 is a front view and a plan view showing the inner box unit 300 of the liquefied gas storage tank 1 of the present invention, and FIG. 4 is the inner box of the liquefied gas storage tank 1 of the present invention. FIG. 9 is a front view and a plan view showing an embodiment in which a first flip door 311 is provided on the upper wall portion 320 of the unit 300, and FIG. 9 is the inner box unit 300 of the liquefied gas storage tank 1 of the present invention. FIG. 4 is a front view showing an embodiment in which a plurality of first flip doors 311 are provided on the side wall 330;

Referring to the above drawings, a liquefied gas storage tank 1 according to an embodiment of the present invention includes a tank unit 100 for storing liquefied gas L, a tank unit 100 installed inside the tank unit 100, and a A pump unit 200 that sucks the liquefied gas L through an inflow pipe part 210 and supplies it to the outside, and a backflow prevention part 310 that allows the liquefied gas L to flow in but not be discharged. It may include an inner box unit 300 provided to surround the periphery.

As described above, the liquefied gas storage tank 1 of the present invention is provided so as to surround the inflow pipe portion 210 of the pump unit 200, and the liquefied gas L is contained therein in one-way. As the fuel of the liquefied gas L is used inside the tank unit 100, the water level is lowered, or the fuel of the liquefied gas L is biased to one side due to the tilt of the liquefied gas storage tank 1 due to the sloshing of the ship. Also, the circumference of the inflow pipe part 210 can be filled with the fuel of the liquefied gas L. As shown in FIG.

As a result, it is possible to prevent the problem of gas flowing into the structure of the engine or the like to which the fuel of the liquefied gas L is to be supplied and cause a failure, and to prevent the problem of the engine part 2a being stopped while the ship is moving. In addition, the capacity of the liquefied gas storage tank 1 can be utilized to the maximum, thereby increasing the operating distance, preventing time loss due to frequent fuel injection, and improving the problem of reduced fuel consumption efficiency due to increased weight of the ship. become able to.

The tank unit 100 is configured to store cryogenic liquefied gas L such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG), and is generally coupled to the hull 2 of a ship. can be provided

Here, when the liquefied gas L is stored, a heat insulating material may be attached to the outer surface of the tank unit 100 to ensure heat insulation of the liquefied gas L. FIG.

In addition, the tank unit 100 may be provided with a support member 110 in order to store the high-pressure liquefied gas L inside. can be prepared for For example, the support member 110 may be provided in the form of a disc with a hole formed in the center.

The pump unit 200 serves to transfer the fuel of the liquefied gas L inside the tank unit 100 to the outside.

However, in order for the pump unit 200 to transfer the fuel of the liquefied gas L to the outside, the inflow pipe part 210 of the pump unit 200 should be immersed in the liquefied gas L, which causes the sloshing phenomenon. occurs, the conventional problem is that the inflow pipe part 210 is not immersed in the fuel of the liquefied gas L and is exposed to the gas space of the liquefied gas storage tank 1. By providing the box unit 300, such a problem could be improved.

Here, the inflow pipe part 210 penetrates the upper surface of the tank unit 100 to be connected to the outside and extends to the inside of the tank unit 100, or penetrates the bottom of the tank unit 100 to be connected to the outside. It can be extended inside the tank unit 100 by being connected to the inside of the tank unit 100 by penetrating the side wall of the tank unit 100 to be connected to the outside.

The inner box unit 300 serves to fill the liquefied gas L around the inflow pipe part 210 . To this end, the inner box unit 300 is provided in the form of a container surrounding the inflow pipe part 210, and includes a backflow prevention part 310 into which the liquefied gas L is introduced but not discharged.

An example of the backflow prevention part 310 may be a first flip door 311 that opens 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 and includes a first flip door 311 which is provided to open and close in only one direction. can be done.

In other words, the first flip door 311 closes the open area of the inner box unit 300, but the liquefied gas L can be opened and moved in the inflow direction. can.

Specifically, one end of the first flip door 311 of the liquefied gas storage tank 1 according to an embodiment of the present invention is hinged to one side of the opening of the inner box unit 300, and the other end is It can be characterized by being extended to be hooked on the inner surface of the inner box unit 300 and moving in close contact with the inner box unit 300 due to 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, the liquefied gas L flows so as to close the open area of the inner box unit 300 . In order to move the liquefied gas L from the outside of the inner box unit 300 to the inside of the inner box unit 300, the first flip door 311 is not driven to be further rotated and opened to the outside. When the first flip door 311 is pushed toward the inside of the inner box unit 300, it is driven to rotate and open.

At this time, the first flip door 311 may be provided with a spring member or the like that exerts an elastic force to the outside at one end hinge-coupled to the inner box unit 300 .

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

That is, the opening through which the liquefied gas L flows into the inner box unit 300 may be formed in the side wall 330 as well as the upper wall 320 of the inner box unit 300. The number is singular or plural. As described above, the first flip door 311 is provided in the opening formed in at least one of the upper wall portion 320 and the side wall portion 330, so that the liquefied gas L is allowed to enter only the inner box unit 300. It can be configured to be housed.

Further, the inner box unit 300 is configured to seal around the inflow pipe part 210 when the first flip door 311 is closed. When the liquefied gas L inside is vaporized due to temperature rise or the like, it vaporizes in the sealed area, so that it cannot vaporize more than a certain amount. Thereby, the vaporization problem of the liquefied gas L can be improved.

FIG. 5 is a front view and a side view showing an embodiment in which the inner box unit 300 of the liquefied gas storage tank 1 of the present invention shares the supporting member 110 and the side wall portion 330, and FIG. FIG. 4 is a front view showing an embodiment in which the side wall portion 330 of the inner box unit 300 of the storage tank 1 forms an extension portion 330a;

Referring to the drawings, the inner box unit 300 of the liquefied gas storage tank 1 according to an embodiment of the present invention is characterized by sharing at least one side wall portion 330 with the supporting member 110 provided inside the tank unit 100 . can be

Accordingly, it is possible to solve the problem that the weight of the liquefied gas storage tank 1 increases as the inner box unit 300 is installed.

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

Here, the inner box unit 300 of the liquefied gas storage tank 1 according to an embodiment of the present invention has the side wall portion 330 coupled between the support members 110 extending upward from the upper wall portion 320 . It can be characterized as having been

That is, the side wall portion 330 provided in addition to the side wall portion 330 substituted for the support member 110 may be configured to have an extension portion 330 a further extending above the upper wall portion 320 . .

According to this, even when the liquefied gas L inside the tank unit 100 is shaken and flows, the circumference of the inner box unit 300 functions as a wave-breaking member so as not to be affected by the flow of the liquefied gas L. come to fulfill.

As a result, the liquefied gas L is stably introduced into the inner box unit 300 .

FIG. 7 is a front view showing an embodiment in which the inner box unit 300 of the liquefied gas storage tank 1 of the present invention is provided with a differential pressure pipe 314. Referring to the above drawings, according to one embodiment of the present invention. The backflow prevention part 310 of the liquefied gas storage tank 1 has a differential pressure inlet end 314a extending outside the inner box unit 300 and an inner box unit 300 extending from the differential pressure inlet end 314a. may include a differential pressure pipe 314 with a differential pressure discharge end 314b located at a lower height.

Since the backflow prevention part 310 includes the differential pressure pipe 314, the liquefied gas L can be introduced into the inner box unit 300 but not discharged.

That is, it is provided so as to surround the inflow pipe portion 210, and by storing the liquefied gas L in one direction inside it, even if the fuel of the liquefied gas L is biased to one side due to the inclination of the tank unit 100, The liquefied gas L can be filled around the inflow pipe part 210 .

In the differential pressure pipe 314, the differential pressure discharge end 314b arranged inside the inner box unit 300 is positioned lower than the differential pressure inlet end 314a arranged outside the inner box unit 300. Due to the resulting pressure difference, the liquefied gas L can be moved to the inner box unit 300 .

That is, the height of the central portion of the differential pressure pipe 314 is not taken into consideration, and only the heights of both ends of the differential pressure pipe 314 determine the flow direction of the liquefied gas L. Since the end 314a 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.

FIG. 8 is a front view showing an embodiment in which the inner box unit 300 of the liquefied gas storage tank 1 of the present invention is provided with an extension pipe 312. Referring to the above drawing, a liquefaction unit according to one embodiment of the present invention is shown. The backflow prevention part 310 of the gas storage tank 1 is arranged to face the outside of the inner box unit 300, and has an extended inflow end 312a provided with a first flip door 311 and an inside of the inner box unit 300. An extension pipe 312 provided with an extended extension discharge end 312b may be included.

That is, since the extension pipe 312 is provided with the first flip door 311 at the extension inflow end 312a, the liquefied gas L flows into the inner box unit 300, but cannot escape to the outside. can be configured to

Further, since the extension pipe 312 extends into the inner box unit 300, the liquefied gas L contained in the inner box unit 300 flows from the extended discharge end 312b to the extended inflow end 312a. You can increase the number of routes you travel. Accordingly, it is possible to effectively prevent the liquefied gas L inside the inner box unit 300 from leaking out 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 arranged in the central part with a lower height than the extension inlet end 312a, but is lower than the extension discharge end 312b. can be characterized by being formed in a bent tube shape arranged at a high height.

That is, when the extension pipe 312 is curved rather than linear, the moving path of the liquefied gas L can be further increased, and a more effective separation prevention effect of the liquefied gas L can be achieved. can have

FIG. 10 is a front view showing an embodiment in which the inner box unit 300 of the liquefied gas storage tank 1 of the present invention is provided with the inclined pipe 313 on the side wall portion 330. Referring to the above drawings, one embodiment of the present invention is shown. The backflow prevention part 310 of the liquefied gas storage tank 1 according to the example is disposed on the side wall part 330 of the inner box unit 300 and has a trumpet shape communicating with the outside. It can include an inclined pipe 313 provided.

That is, since the inclined pipe 313 is also provided with the first flip door 311 at the inner end portion 313a, the liquefied gas L flows into the inner box unit 300 and cannot be released outside. be able to.

Further, the slanted pipe 313 is constructed such that its width increases from the inner end 313a toward the outer end. Since it is necessary to pass through a relatively narrow area when leaving the inner box unit 300, the effect of preventing the outside from leaving can be enhanced, and the liquefied gas L is stored inside the inner box unit 300 from the outside of the inner box unit 300. In this case, the liquefied gas L can be accommodated more easily because it is sufficient to pass through a relatively wide area.

FIG. 11 is a front view showing an embodiment in which the liquefied gas storage tank 1 of the present invention is equipped with a low temperature maintenance unit 400, and FIG. FIG. 13 is a front view showing an embodiment extended to the part 330, and FIG. 13 is a front view showing an embodiment in which only the insertion cylinder part 410 is provided in the low temperature maintenance unit 400 of the liquefied gas storage tank 1 of the present invention. be.

Referring to the drawings, the liquefied gas storage tank 1 according to an embodiment of the present invention includes a low temperature maintenance unit 400 which is provided to contact at least the inflow pipe part 210 and accommodates the liquefied gas L therein. can be done.

That is, since the liquefied gas storage tank 1 of the present invention includes the low temperature maintenance unit 400, the inflow pipe part 210 can be kept at a low temperature. It is possible to prevent the problem that L evaporates due to temperature rise.

That is, even though the inner box unit 300 fills the liquefied gas L around the inflow pipe part 210 , the liquefied gas L is accommodated in the inner box unit 300 through the inflow pipe part 210 . is discharged to the outside, a relatively high-temperature gas region may be formed around the inflow pipe part 210. In this case, the liquefied gas L is moved through the inflow pipe part 210. The low temperature maintenance unit 400 is provided because the vaporization problem may occur.

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 inner box unit 300 by inserting the inflow pipe part 210, An insertion cylinder part 410 that contacts the inflow pipe part 210 may be included.

That is, the low temperature maintenance unit 400 includes the insertion cylinder part 410 which contacts around the inflow pipe part 210 and contains the relatively low temperature liquefied gas L therein.

As an example, the liquefied gas L includes liquefied natural gas (LNG) or liquefied propane gas (LPG). Since the liquefied propane gas has a boiling point of about -50.degree. C., the inflow pipe portion 210 can be maintained at about -162.degree.

To this end, the insertion cylinder part 410 may include an inner tube part 411 and an outer tube part 412 . The insertion cylinder part 410 of the liquefied gas storage tank 1 according to the embodiment of the present invention includes an inner pipe part 411 that contacts the inflow pipe part 210 and is spaced apart from the inner pipe part 411 by a predetermined distance to insert the liquefied gas L. It may include an outer tube part 412 that accommodates the inner tube part 411 and one end of which is coupled to the inner tube part 411 .

Here, the inflow pipe portion 210 is inserted into and contacts the inner pipe portion 411, and a space is formed between the inner pipe portion 411 and the outer pipe portion 412 to accommodate the liquefied gas L. become.

That is, the inner tube part 411 and the outer tube part 412 have a double-pipe structure, and the lower ends thereof are connected to each other so that the liquefied gas L can be accommodated without escape.

In addition, the insertion cylinder part 410 has an upper end extending outside the inner box unit 300 to be positioned above the inner box unit 300, and has an open upper end. With this configuration, the liquefied gas L can be accommodated therein, and the environment around the inflow pipe part 210 can be maintained at a low temperature.

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

In the case of this embodiment, the liquefied gas L can be accommodated without separately providing the first flip door 311 at the upper end of the insertion cylinder part 410 . For this, reference can be made to FIG.

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

The low temperature maintenance unit 400 of the liquefied gas storage tank 1 according to an embodiment of the present invention communicates with the upper end of the insertion cylinder part 410, and is connected to the upper wall part 320 of the inner box unit 300 or the inner box unit. It may include a double wall portion 420 extending from the upper wall portion 320 and the side wall portion 330 of 300 and having a second flip door 421 that opens and closes only in one direction so that the liquefied gas L flows thereinto. .

The double wall portion 420 has the effect of forming the inlet pipe portion 210 in a low temperature environment and forming the outer portion of the inner box unit 300 in a low temperature environment.

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

In other words, the double wall part 420 is provided on the upper wall part 320 of the inner box unit 300, and can be formed in a '￢' shape when viewed from the front sectional view. For this, reference can be made to FIG.

According to this, the insertion cylinder part 410 disposes the liquefied gas L in order to maintain the inlet pipe part 210 in a low temperature environment, and also maintains the upper wall part 320 of the inner box unit 300 in a low temperature environment. The liquefied gas L can also be placed in the .

Also, the double wall part 420 is provided on the upper wall part 320 and the side wall part 330 of the inner box unit 300, and may be formed in an 'n' shape when viewed from the front sectional view. For this, reference can be made to FIG.

According to this, the insertion cylinder part 410 disposes the liquefied gas L to maintain the inlet pipe part 210 in a low temperature environment, and the upper wall part 320 and the side wall part 330 of the inner box unit 300 are kept in a low temperature environment. A liquefied gas L can also be arranged to maintain the

Here, the double wall portion 420 may be a double plate member having a space formed therein in order to accommodate the liquefied gas L inside the double wall portion 420. The space between the outer tube part 412 and the inner tube part 411 of 410 may be communicated and connected.

In order to receive the liquefied gas L inside the double wall portion 420, a second flip door 421 is provided on the upper surface to receive the liquefied gas L inside the double wall portion 420, It can be configured to prevent outward movement.

FIG. 14 is a side view showing a liquefied gas storage tank 1 and a ship including the same according to the present invention. A liquefied gas storage tank 1 is provided and may include a hull 2 including an engine section 2a that provides motive power.

That is, since the ship includes the liquefied gas storage tank 1, the water level in the tank unit 100 decreases as the fuel of the liquefied gas L is used, or the liquefied gas is stored due to the sloshing of the ship. Even if the fuel of the liquefied gas L is biased to one side due to the inclination of the tank 1, the fuel of the liquefied gas L can be filled around the inflow pipe portion 210, and the liquefied gas can be stably supplied to the engine portion 2a. L can be supplied as fuel.

In addition, by maintaining a low-temperature environment around the inflow pipe part 210, vaporization of the liquefied gas L moving through the inflow pipe part 210 can be prevented.

As a result, it is possible to prevent the problem of the gas flowing into the structure of the engine or the like to which the fuel of the liquefied gas L is to be supplied and cause a failure, and the problem of the engine part 2a stopping during movement of the ship can be prevented. The capacity of the liquefied gas storage tank 1 can be utilized to the maximum, thereby increasing the operating distance, preventing time loss due to frequent fuel injection, and improving the problem of reduced fuel consumption efficiency due to increased weight of the ship. become.

Although the embodiments of the present invention have been described in detail above, the scope of rights of the present invention is not limited thereto, and various modifications and modifications can be made without departing from the technical idea of the present invention described in the claims. Variations are possible and will be apparent to those of ordinary skill in the art.

Claims (16)

a tank unit in which the liquefied gas is stored;
a pump unit installed inside the tank unit, sucking the liquefied gas stored inside the tank unit through an inflow pipe and supplying the liquefied gas to the outside; a liquefied gas storage tank comprising: an inner box unit provided with a section and arranged to surround said inlet pipe section. The backflow prevention part is
The liquefied gas storage tank according to claim 1, comprising: a first flip door provided in the inner box unit to be opened and closed in only one direction. The liquefied gas storage tank according to claim 2, wherein at least one of the first flip doors is provided on the upper wall or the side wall of the inner box unit. The first flip door has one end hinge-coupled to one side of the opening of the inner box unit, and the other end extending to cover the inner surface of the inner box unit. The liquefied gas storage tank according to claim 2, wherein the liquefied gas storage tank moves in close contact with the box unit. The backflow prevention part is
an extension pipe with an extension inlet end facing the exterior of the inner box unit and provided with a first flip door, and an extension pipe with an extension discharge end extending inside the inner box unit; Item 3. The liquefied gas storage tank according to item 2. The extension pipe is formed in a bent tube shape arranged at a central portion lower in height than the extended inflow end but higher in height than the extended discharge end, A liquefied gas storage tank according to claim 5. The backflow prevention part is
3. The liquefied gas storage tank according to claim 2, further comprising: a slanted pipe disposed on a side wall of the inner box unit and having a trumpet-like shape communicating with the outside, and having an inner end provided with the first flip door. . The backflow prevention part is
A differential pressure inflow end extending to the outside of the inner box unit and a differential pressure discharge end extending into the inner box unit and arranged at a lower height than the differential pressure inflow end are provided. 2. A liquefied gas storage tank according to claim 1, comprising a differential pressure pipe; 2. A liquefied gas storage tank according to claim 1, comprising: a cryogenic unit provided in contact with at least said inlet pipe portion and in which said liquefied gas is contained. The low temperature maintenance unit
10. The liquefied gas storage tank according to claim 9, further comprising an insertion cylinder part which is provided to communicate with the inner box unit through which the inflow pipe part is inserted, and which is in contact with the inflow pipe part. The insertion cylinder part
11. An outer pipe portion, which is spaced apart from the inner pipe portion by a predetermined distance and accommodates the liquefied gas, and has one end coupled to the inner pipe portion. A liquefied gas storage tank according to . 11. The liquefied gas storage tank according to claim 10, wherein the insertion cylinder part extends upward from the inner box unit and has an open upper end. The low temperature maintenance unit
Communicates with the upper end of the insertion cylinder part, extends to the upper wall of the inner box unit or the upper and side walls of the inner box unit, and opens and closes in only one direction so that the liquefied gas flows inward. 11. A liquefied gas storage tank according to claim 10, comprising: a double-walled portion provided with a second flip door. The liquefied gas storage tank according to claim 1, wherein the inner box unit shares at least one side wall with a supporting member provided inside the tank unit. 15. The liquefied gas storage tank according to claim 14, wherein the inner box unit has side walls coupled between the support members extending upward from the upper wall. A marine vessel comprising: a liquefied gas storage tank according to any one of claims 1 to 15; and a hull comprising an engine section provided with said liquefied gas storage tank and providing motive power.

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