WO2021241947A1

WO2021241947A1 - Lng iso tank having overflow prevention apparatus

Info

Publication number: WO2021241947A1
Application number: PCT/KR2021/006382
Authority: WO
Inventors: 강영진
Original assignee: 주식회사 에이지코리아
Priority date: 2020-05-26
Filing date: 2021-05-21
Publication date: 2021-12-02

Abstract

The present invention relates to a liquefied natural gas (LNG) ISO tank overflow prevention apparatus, and more specifically, to an apparatus which prevents LNG in an LNG ISO inner tank from spilling over to a connector when the LNG sloshes due to an acceleration change of a carrier, thereby preventing the pressure in the inner tank from increasing. The LNG ISO tank overflow prevention apparatus, according to the present invention, comprises an inner tank, a connector, and an overflow prevention apparatus. The overflow prevention apparatus is positioned at the upper portion of the inner tank, and preferably, has an entrance facing the ground by being bent at 90° with respect to the axial direction of the tank. In addition, an exit of the overflow prevention apparatus is preferably connected to the connector. In addition, the connector is preferably positioned at an end plate which is in the axial direction of the tank. According to the present invention, when LNG in the inner tank sloshes due to an acceleration change of a carrier, the LNG ISO tank overflow prevention apparatus prevents the LNG from spilling over to the connector on the lateral surface, and thus prevents the pressure in the inner tank from increasing. In addition, the apparatus prevents LNG in the inner tank from spilling over beyond the connector, and thus prevents loss of LNG in the inner tank.

Description

LNG ISO tank with overflow protection

The present invention relates to an LNG ISO tank equipped with an overflow prevention device, and more particularly, to prevent the liquefied natural gas from passing to the outside of the inner tank when the liquefied natural gas in the LNG ISO inner tank is fluctuated due to a change in the acceleration of the carrier. This is to prevent pressure rise.

Natural gas is widely consumed as an economical and eco-friendly energy. However, the cost and efficiency are lowered due to the volume to be transported in the natural gas state.

In order to supplement this point, a method of transporting in the state of liquefied natural gas (LNG) is widely used.

LNG is stored and transported in ISO tanks, which are container tanks manufactured according to ISO (International Standardization Organization) standards.

The ISO tank is composed of an outer tank in a vacuum state to block external heat intrusion, an insulating material surrounding the inner tank, and a low-temperature inner tank in which LNG in a cryogenic state is stored. The outer tank protects the inner tank from external impact and forms a vacuum between the inner tank and the outer tank to insulate the liquefied gas of the inner tank from the external temperature.

ISO tanks are transported by a carrier such as a vehicle or a ship, and the fluctuation of the liquefied natural gas stored in the internal tank occurs due to a change in the acceleration of the carrier during transport.

In the existing ISO tank, when the liquefied natural gas stored in the internal tank fluctuates in the axial direction of the ISO tank due to a change in the acceleration of the carrier carrying the ISO tank, the liquefied natural gas flows over. As such, when the liquefied natural gas overflows and flows outside the inner tank, a problem occurs in that the pressure of the inner tank rises.

Therefore, the present invention is to solve the above-mentioned problem, and when the LNG ISO tank is transported by a carrier, the liquefied natural gas fluctuates due to a change in the acceleration of the carrier, thereby preventing the liquefied natural gas from overflowing out of the inner tank. It relates to an LNG ISO tank equipped with an overflow prevention device.

An LNG ISO tank equipped with an overflow prevention device according to the present invention includes an inner tank, a connecting connector, and an overflow prevention device.

In addition, the overflow prevention device is located on the upper part of the inner tank, it is preferable that the inlet is bent at 90° to the axial direction of the tank to face the ground.

In addition, the outlet of the overflow prevention device is preferably connected to the connection connector.

Also, the connecting connector is preferably located on the axial end plate of the tank.

The LNG ISO tank equipped with the overflow prevention device according to the present invention prevents the liquefied natural gas of the inner tank from passing through the connection connector on the side when the sloshing occurs due to the change in the acceleration of the carrier, thereby preventing the pressure increase of the inner tank.

In addition, it prevents the liquefied natural gas of the inner tank from passing over the connector to prevent loss of the liquefied natural gas in the inner tank.

1 is a perspective longitudinal cross-sectional view simply showing a part of an inner tank of an LNG ISO tank having an overflow prevention device according to an embodiment of the present invention.

2 is a perspective cross-sectional view simply showing a part of an inner tank of an LNG ISO tank having an overflow prevention device according to an embodiment of the present invention.

In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference signs to the elements of each drawing, it should be noted that only the same elements are indicated by the same reference signs as possible even if they are indicated on different drawings.

Hereinafter, an LNG ISO tank equipped with an overflow prevention device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 2 .

A typical LNG ISO tank includes an inner tank 10 in which LNG is directly stored, and an outer tank (not shown) provided in a form to surround the inner tank 10 at a predetermined interval from the inner tank 10 . The space between the inner tank 10 and the outer tank is maintained in a vacuum state, and the space between the inner tank 10 and the outer tank will be referred to as a vacuum unit (not shown).

That is, the inner tank 10 and the vacuum unit are provided inside the outer tank, the LNG is stored in the inner tank 10, the inner tank 10 is fixedly installed in the outer tank, and the liquefied natural gas is provided in the inner tank 10. Gas will fill about 90% of the total capacity.

In a typical LNG ISO tank, as a means for checking whether the level of liquefied natural gas maintains a target value (about 90%) while the LNG ISO tank is transported through a carrier, an inner tank at the upper end of the inner tank 10 A length portion 11 in the form of a bar providing a flow path through which the fluid can flow along the axial direction of (10) is provided.

The length part 11 is connected to a pipe connected to the outside of the inner tank 10, the pipe is provided with a valve, and when you want to check the water level, the valve is opened, and the fluid transferred through the pipe The water level is checked by checking the phase.

However, since the existing length portion 11 is installed in parallel along the axial direction of the inner tank 10 at the upper end of the inner tank 10, the liquefied nature stored in the inner tank 10 due to a change in the acceleration of the carrier, etc. As the gas fluctuates, the liquefied natural gas overflows through the length 11 and passes to the outside of the inner tank 10 , and the inner tank 10 connected to the length 11 has a temperature higher than that of the inner tank 10 . is high, so the liquefied natural gas is vaporized, which eventually causes a problem of increasing the pressure in the internal tank 10 .

As shown in FIG. 1, the overflow prevention device according to this embodiment is installed on the inner wall of the inner tank 10 along the axial direction of the inner tank 10 at the upper end of the inner tank 10, and the flow of the fluid is prevented. By forming the overflow prevention device inlet 12 at one end of the bar-shaped length 11 that provides a possible flow path, overflow prevention in which the liquefied natural gas is formed at the other end of the length 11 by the sloshing of the liquefied natural gas It is possible to prevent a phenomenon from passing out of the inner tank 10 through the device outlet 13 .

The length 11 is not provided over the entire length of the upper end of the inner tank 10, as shown in FIG. 1, but the axial length of the inner tank 10 from the front of the inner tank 10 It may extend toward the rear of the inner tank 10 from 1/3 of the point. That is, the length 11 may be installed only by a length corresponding to about 2/3 of the length of the upper end of the inner tank 10 .

As shown in FIG. 1, the overflow prevention device inlet 12 of this embodiment is provided inside the inner tank 10, and is perpendicular to the axial direction of the inner tank 10 from the length 11 (90°) It is bent and formed to extend a certain length toward the bottom of the inner tank 10 .

In addition, as shown in FIG. 1 , the overflow prevention device inlet 12 extends from the length 11 so that the end is in contact with the surface of the water level (about 90%) of the liquefied natural gas stored in the inner tank 10 . can be extended

As shown in FIG. 1 , the inlet 12 of the overflow prevention device of this embodiment may be provided at 1/3 of the axial length of the inner tank 10 from the front of the inner tank 10 .

On the other hand, the overflow prevention device outlet 13 of this embodiment is located outside the inner tank 10, and extends from the length 11 to parallel to the axis of the inner tank (10).

In addition, the overflow prevention device outlet 13 may be installed in the LNG ISO tank by passing through the connection connector 20 installed on the end end plate of the inner tank 10 to extend to the outside of the inner tank 10 .

In this embodiment, the connecting connector 20 is a member provided so that the overflow prevention device outlet 13 can be fixed to the inner tank 10 .

On the other hand, when there is a step difference between the length part 11 and the connection connector 20, as shown in FIG. 1, the step difference connecting the length part 11 and the overflow prevention device outlet 13 in an oblique direction. It may further include a control unit (reference numeral not assigned).

As described above, in the prior art, the liquefied natural gas stored in the inner tank 10 swayed in the axial direction due to a change in the acceleration of a carrier for transporting the LNG ISO tank, and the liquefied natural gas was transferred through the length 11 to the inner tank 10 ) occurred outside the

However, according to the present embodiment, by bending one end of the length part 11 in the vertical direction to provide the overflow prevention device inlet 12, there is a problem in that the liquefied natural gas stored in the internal tank 10 sways in the axial direction. Even so, it is possible to prevent the phenomenon that the liquefied natural gas flows to the outlet 13 of the overflow prevention device undesirably.

The present invention is not limited to the above embodiments, and it is apparent to those skilled in the art that various modifications or variations can be implemented without departing from the technical gist of the present invention. did it

10: inner tank

11: length part

12: Inlet of overflow prevention device

13: overflow prevention device exit

20: connecting connector

Claims

external tank; and

Including; an inner tank that is fixedly installed at a distance from the outer tank inside the outer tank;

a length part installed horizontally on the upper end of the inner tank;

an overflow prevention device inlet extending from one end of the length; and

An LNG ISO tank equipped with an overflow prevention device including; an overflow prevention device outlet extending from the other end of the length portion.
The method according to claim 1,

The inlet of the overflow prevention device is provided inside the inner tank, and extends from one end of the length portion toward the bottom surface of the inner tank in a direction perpendicular to the axis of the inner tank, the LNG ISO tank provided with the overflow prevention device .
The method according to claim 1,

The overflow prevention device outlet is provided on the outside of the inner tank and extends from the other end of the length part in parallel with the axis line of the inner tank, the LNG ISO tank having an overflow prevention device.
4. The method according to claim 3,

It further comprises;

The overflow prevention device outlet extends from the length portion through the connection connector to the outside of the inner tank, the LNG ISO tank having an overflow prevention device.
The method according to claim 1,

The length portion is formed at the upper end of the inner tank by 2/3 the length of the inner tank, and the overflow prevention device inlet is formed at 1/3 of the length of the inner tank. ISO tank.