KR102013043B1 - Support apparatus for double storage tank of lng - Google Patents

Abstract

LNG dual storage tank support device according to the present invention, LNG dual storage tank support device for supporting an LNG double storage tank including an inner tank in which the LNG is stored and the outer tank to support the inner tank, LNG double storage tank It includes a fixed unit for fixing the posture to the hull, and between the inner tank and the outer tank of the LNG dual storage tank, the support unit for movably supporting the inner tank within the range set for the outer tank in conjunction with the volume change of the inner tank.

Description

SUPPORT APPARATUS FOR DOUBLE STORAGE TANK OF LNG

The present invention relates to a support device for an LNG dual storage tank, and more specifically, for an LNG dual storage tank which can improve safety by flexibly responding to the deformation and movement of the LNG dual storage tank according to the temperature change of LNG. It relates to a support device.

In general, natural gas is transported in gaseous state through onshore or offshore gas pipelines, or liquefied liquefied natural gas (LNG) in LNG carriers to remote consumers. Liquefied Natural Gas (hereinafter referred to as LNG) has a volume corresponding to 1/600 of the volume of natural gas by cooling the natural gas to a cryogenic temperature of approximately -163 ° C. As a result, LNG is a clean fuel that is easy to store and transport, and an increasing number of cases are used as fuel for engines, which are propulsion devices for ships.

On the other hand, the design and construction of tanks for the transport and storage of LNG cargo is mainly defined by the International Maritime Organization (IMO) through the application of the International Gas Carrier Code (IGC Code). The IGC Code allows a wide range of cargo containment systems. Of these cargo containment systems, cylindrical LNG storage tanks are one of the most widely adopted containment systems for LNG and fuel oil storage.

On the other hand, the LNG storage tank for LNG transport and storage is stored in the cryogenic LNG, the volume change of the LNG storage tank is caused by the temperature change of the LNG. Since the volume change of the LNG storage tank may flow and be damaged inside the vessel in operation, in recent years, various studies to improve the stability of the LNG storage tank are continuously required.

Domestic Publication No. 10-2016-0090935

An object of the present invention is to provide a support device for an LNG dual storage tank that can provide a stable support by flexibly responding to the volume change of the LNG storage tank according to the temperature change of the LNG stored therein.

Another object of the present invention is to provide an LNG dual storage tank support device capable of stably fixing the LNG dual storage tank with respect to the hull against the movement of the hull.

LNG dual storage tank support device according to the present invention for achieving the above object, LNG dual storage tank support device for supporting the LNG double storage tank including an inner tank in which the LNG is stored and the outer tank to support the inner tank. And a fixed unit configured to stably fix the LNG dual storage tank to the hull and an inner tank and an outer tank of the LNG dual storage tank, in response to a volume change of the inner tank, the inner tank within a range set for the outer tank. And a support unit for movably supporting.

According to one side, the fixing unit is fixed to the hull, the fixing member having a fixed surface that is in close contact with the outer tank and in close contact with the outer tank and the pressurized position to press the outer tank and non-interfering the outer tank outside the pressing position It may include a pressing member provided on the fixing member so as to be movable between the non-pressing position.

According to one side, the fixing surface of the fixing member is provided to extend from the lower portion of the LNG dual storage tank to the side of the LNG dual storage tank, the pressurizing member is a pair to face each other with the LNG dual storage tank in between. Is provided as, rotatably coupled to the upper end of the fixing member may be rotatable between the pressing position and the non-pressing position.

According to one side, the support unit may be provided with an interference protrusion protruding toward the outer tank with respect to the inner tank to selectively interfere with some of the plurality of heat insulating members provided between the inner tank and the outer tank.

According to the present invention having the configuration as described above, first, the support provided between the inner tank and the outer tank regulates the movement range of the inner tank contracted or relaxed in response to the temperature change of the LNG, the inner tank is rolled over a certain range relative to the outer tank It is possible to prevent the occurrence of damage due to the posture is incorrect.

Second, it is possible to flexibly support the volume change of the inner tank to the outer tank, it is possible to provide a stable support.

Third, due to the fastening member wrapped up to the side of the LNG dual storage tank it is possible to prevent the departure of the LNG dual storage tank due to sudden hull movement.

Fourth, the pressing member is rotatable with respect to the fixing member, so that the LNG double storage tank which is seated on the fixing member may be intrusive to improve a damage problem such as scratching.

1 is a side view schematically showing a support device for an LNG dual storage tank according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically illustrating a state cut along the line II-II ′ of FIG. 1.
3 is a cross-sectional view schematically illustrating a state cut along the line III-III ′ of FIG. 1.
4 is a schematic cross-sectional view illustrating an enlarged region IV of FIG. 2.
FIG. 5 is a plan view schematically illustrating the first inner stopper illustrated in FIG. 4.
FIG. 6 is a plan view schematically illustrating the first outer shell stopper illustrated in FIG. 4.
FIG. 7 is a cross-sectional view schematically illustrating the enlarged region of FIG. 2.
8 is an enlarged cross-sectional view schematically illustrating the region X of FIG. 2.
FIG. 9 is a cross-sectional view schematically illustrating a rolled state of the third support part illustrated in FIG. 8. And,
FIG. 10 is a cross-sectional view schematically illustrating the enlarged region of FIG. 3.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. However, the spirit of the present invention is not limited to such an embodiment, and the spirit of the present invention may be proposed differently by the addition, change, deletion, etc. of the elements constituting the embodiment, but this is also included in the spirit of the present invention. Will be.

1 is a side view schematically showing a support device 1 for an LNG dual storage tank according to an embodiment of the present invention.

Referring to FIG. 1, the support device 1 for an LNG dual storage tank according to an exemplary embodiment of the present invention includes a fixed unit 10 and a support unit 20.

For reference, the LNG dual storage tank support device 1 described in the present invention includes an inner tank (T1) and an inner tank (T1) in which liquefied natural gas (hereinafter referred to as LNG) is stored therein at a cryogenic temperature of -163 ° C. The LNG double storage tank T including the outer tank T2 wrapped and supported is illustrated and illustrated as supporting the hull S.

In this case, the inner tank T1 may be formed of a metal material that forms a space for storing LNG therein and may withstand the temperature of LNG stored at cryogenic temperatures. For example, the inner tank T1 may be formed of a low temperature composite material such as a metal or a glass metal reinforced epoxy having excellent low temperature properties such as aluminum, stainless steel, and 9% nickel steel. In addition, the inner tank T1 may be formed of a metal or a material having a low thermal relaxation coefficient in order to reduce the occurrence of stress due to heat shrinkage due to cryogenic temperature.

The outer tub T2 may be formed of a stainless steel material to withstand the internal pressure. Preferably, since the stress applied to the inside of the inner tank T1 may be transmitted to the outer tank T2, the steel tank may be made of a steel material having a strength that can withstand the pressure inside the inner tank T1 and reducing the cost. have.

On the other hand, the inner tank (T1) and the outer tank (T2) of the LNG dual storage tank (T) is shown and illustrated as having a cylindrical shape, as shown in Figures 1 to 3, but is not limited thereto.

The fixed unit 10 postures the LNG dual storage tank (T) with respect to the hull (S). To this end, as shown in Figures 2 and 3, the fixing unit 10 includes a fixing member 11 fixed to the hull (S) and the pressing member 12 for pressing the LNG double storage tank (T). .

2 and 3, the fixing member 11 is extended in a state fixed to the hull (S), is in close contact with the outer tank (T2). The upper surface of the fixing member 11 is formed with a curved fixed surface 111 so as to correspond to the bottom shape of the outer tub T2 having a cylindrical shape. The fixed surface 111 has a shape extending from the bottom of the LNG dual storage tank (T) to the side position near the central axis (C), thereby supporting in close contact from the bottom of the LNG dual storage tank (T) to the side. .

The pressing member 12 is in close contact with the outer tub T2 and is fixed to the movable member 11 so as to be movable between a pressurizing position for pressing the outer tub T2 and a non-pressurizing position that does not interfere with the outer tub T2 out of the pressurizing position. To be prepared. The pressing members 12 are provided in pair so as to face each other with the LNG dual storage tank T therebetween. In addition, the pressing member 12 is rotatably coupled to the upper end of the fixing member 11 by the hinge 121, it is illustrated as being provided to be rotatable between the pressing position and the non-pressing position. However, the present invention is not limited thereto, and it is obvious that various modification embodiments are possible, such as the pressing member 12 sliding between the pressing position and the non-pressing position.

2 and 3, when the pressure member 12 is rotated to the non-pressurized position with respect to the upper end of the fixing member 11, the LNG dual storage tank (T) fixed surface of the fixing member ( 111 can be seated without interference with the pressing member 12. Thereafter, the pressurizing member 12 is rotated to a pressurized position toward the side of the LNG dual storage tank T seated on the fixing member 11, thereby interfering with the LNG dual storage tank T to fix the posture.

As described above, the fixed member 11 is supported from the bottom surface of the LNG dual storage tank (T) to the side, the pressurizing member 12 presses the LNG dual storage tank (T), LNG double storage for the hull (S) The tank T is fixed in posture without flowing. More specifically, the LNG dual storage tank T seated on the fixing member 11 and pressurized by the pressure member 12 is separated even if the sudden movement of the hull S occurs. It is possible to fix the posture so as not to.

The support unit 20 is provided in plural positions at the shear stress occurs between the inner tank (T1) and the outer tank (T2) of the LNG dual storage tank (T), the inner tank (T1) in conjunction with the volume change of the inner tank (T1) Support movably within the range set for the outer tub (T2). That is, the volume of the inner tank T1 may be caused by a change in temperature of the LNG, and the support unit 20 may flexibly set the inner tank T1 with respect to the outer tank T2 according to the volume change of the inner tank T1. Supports sliding in the longitudinal direction (L) or rolling in the circumferential direction (R) within the range. To this end, the support unit 20 includes a first support part 30, a second support part 40, and a third support part 50.

The first support part 30 is provided in a lower portion between the inner tub T1 and the outer tub T2 and is provided in at least one pair so as to support a lower portion between the inner tub T1 and the outer tub T2. As shown in FIG. 1, the first support part 30 is provided in multiple rows to be spaced apart from each other in the longitudinal direction of the LNG dual storage tank T, and may be arranged in pairs in the same row as shown in FIGS. 2 and 3. . However, it is a matter of course that the installation position and the number of the first support parts 30 are not limited to those shown in FIGS. 1 to 3.

As shown in FIG. 4, the first support part 30 includes a first heat insulating member 31 and a first heat insulating support part 32.

The first insulation member 31 is interposed between the inner tub T1 and the outer tub T2, and is formed of an elastic material to insulate the tub between the inner tub T1 and the outer tub T2. The first insulation member 31 may have a substantially rectangular parallelepiped shape, and an inclined surface 311 may be formed at an edge portion thereof. The first insulation member 31 may be elastically acted in the heat shrinkage direction of the inner tub T1, and the inclined surface 311 may increase the contact area in contact with the inner tub T1, thereby also impacting the inner tub T1. , Can absorb.

For reference, the first insulation member 31 is illustrated as being formed of an elastic material, but is not limited thereto, and may be formed of a non-elastic material. For example, the first insulation member 31 may be formed of wood or fiber reinforced plastic (FRP) material.

The first heat insulating support part 32 supports the first heat insulating member 31 with respect to the inner bath T1 and the outer bath T2, respectively. To this end, the first heat insulating support part 32 includes a first inner shell reinforcement 33, a first outer shell reinforcement 34, a first inner shell stopper 35, and a first outer shell stopper 36.

The first inner tub reinforcement 33 is in close contact with the inner tub T1, and the first outer tub reinforcement 34 is in close contact with the outer tub T2. The first inner tub reinforcement 33 and the first outer tub reinforcement 34 have a plate shape having curvatures corresponding to the inner tub T1 and the outer tub T2, respectively. The first inner tub reinforcement body 33 and the first outer tub reinforcement body 34 are adhered to and fixed to the inner tub T1 and the outer tub T2 by an adhesive means such as an adhesive, respectively, and the first insulation member 31 Intersect each other.

In addition, the first insulation member 31 is provided with a non-constrained non-constrained surface 312 with respect to the first inner tubular reinforcement 33, but by a bonding means such as adhesive to the first outer tubular reinforcement 34 It is provided in a restrained state. Therefore, the first inner tub reinforcement body 33 can move relative to the non-constrained surface 312 of the first insulation member 31, thereby supporting the movement of the inner tub T1 due to the volume change of the inner tub T1. can do.

As shown in FIG. 5, the first inner shell stopper 35 restricts the rolling movement of the first insulation member 31 in the circumferential direction R with respect to the first inner shell reinforcement 33. The first inner tank stopper 35 is interposed between the first inner tank support 351 and the first insulation member 31 to regulate the movement of the first insulation member 31. In this case, the first inner tubular support 351 is provided as a pair of plates to face each other in the circumferential direction R with the first insulation member 31 and the first inner tub stopper 35 interposed therebetween.

The first inner tubular support 351 is provided with a plurality of first inner tubular support ribs 352 extending toward the first inner tubular reinforcement 33 to support the movement of the first insulation member 31.

On the other hand, since the movement of the first inner tank stopper 35 is not restricted in the longitudinal direction L, when the volume of the inner tank T1 is changed, the first heat insulating member 31 has an inner tank T1 with respect to the outer tank T2. Can support sliding in the longitudinal direction (L).

The first outer shell stopper 36 restricts the rolling and sliding movement of the first insulation member 31 with respect to the first outer shell reinforcement 34. The first outer shell stopper 36 is interposed between the first outer shell support 361 and the first insulation member 31 to regulate the rolling and sliding movement of the first insulation member 31. To this end, as shown in FIG. 6, the first outer shell support 361 has a shape surrounding the circumference of the first insulation member 31 such that the first insulation member 31 and the first outer shell stopper 36 adhere to the inner surface. Has

More specifically, the first outer shell stopper 36 is provided in a 'ㅁ' shape in close contact with the side of the first insulation member 31 all around, the first outer shell support 361 of the 'ㅁ' shape It adheres to the inner surface. Therefore, the 1st outer shell stopper 36 restricts that the 1st heat insulating member 31 slides along the 1st outer shell reinforcement 34 in the longitudinal direction L, or is rolled in the circumferential direction R. As shown in FIG. A plurality of first outer shell support ribs 362 are also provided in the first outer shell support 361 to reinforce the fixing force.

On the other hand, the first inner tub stopper 35 and the first outer tub stopper 36 are lower than the height at which the first inner tub support 351 and the first outer tub support 361 protrude from the inner tub T1 and the outer tub T2, respectively. It may be formed at a height. Therefore, the first inner tub stopper 35 and the first outer tub stopper 36 restrain the first insulation member 31 and directly contact the first inner tub support 351 and the first outer tub support 361. When the heat shrinkage deformation of the inner tub T1 occurs, the stress caused by contact is increased to solve the problem of breaking the first inner tub support 351 or the first outer tub support 361.

In addition, the first inner tank stopper 35 and the first outer tank stopper 36 are formed of an elastic material similarly to the first insulation member 31, thereby restraining the movement of the first insulation member 31, Since the inner tubular support 351 and the first outer tubular support 361 may be elastically integrated with each other, the first tubular support 351 and the first outer tubular support 361 may not be separated from or damaged.

The first support part 30 as described above allows the first insulation member 31 to slide in the longitudinal direction L only with respect to the inner tank T1, and the longitudinal direction L and the circumferential direction with respect to the outer tank T2. R) to prevent movement. Therefore, upon contraction or relaxation in the longitudinal direction L of the LNG dual storage tank T, the first support part 30 flexibly slides the inner tank T1 in the longitudinal direction L with respect to the outer tank T2. It becomes possible to cope.

 The second support portion 40 is spaced apart from the first support portion 30 and interposed between the sides between the inner tub T1 and the outer tub T2 to support at least one side between the inner tub T1 and the outer tub T2. Is prepared. As shown in FIG. 1, the second support part 40 is also arranged in multiple rows to be spaced apart in the longitudinal direction L of the LNG dual storage tank T, and is provided in a plurality of pairs.

As shown in FIG. 7, the second support part 40 supports the second heat insulating member 41 and the second heat insulating member 41 of elastic material interposed on the side surface between the inner tank T1 and the outer tank T2. It includes a second heat insulating support 42.

Here, the second heat insulating member 41 is formed of an elastic material having a substantially rectangular parallelepiped and having an inclined surface 411 at the corner, similarly to the first heat insulating member 31 described above. Since the second insulation member 41 is similar to the first insulation member 31, detailed description thereof will be omitted.

The second heat insulating support part 42 interlocks with the volume change of the inner bath T1 while the second heat insulating member 41 is fixed to the outer tub T2, and interposed the second heat insulating member 41 with the second heat insulating member 41 interposed therebetween. ) To be movable relative to the outer shell T2. To this end, the second heat insulating support part 42 includes a second inner tub reinforcement body 43 in close contact with the inner tank T1, a second outer tub reinforcement body 44 in close contact with the outer tank T2, and a second outer tub reinforcement body ( And a second outer tub stopper 45 for regulating the movement of the second insulating member 41 with respect to 44.

Here, both the second inner tub reinforcement 43 and the second outer tub reinforcement 44 are bonded to and restrained with respect to the inner tub T1 and the outer tub T2, and the second insulation member 41 is the second outer tub. Only the reinforcement body 44 is bonded and restrained. That is, the second insulation member 41 has a non-constrained surface 412 that is not constrained with respect to the second inner tub reinforcement 43, thereby preventing contraction and relaxation by not restraining the inner tank T1 whose volume is changeable. Allow.

The second outer shell stopper 45 is for regulating the movement of the second insulation member 41 with respect to the second outer shell reinforcement 44, and has the same configuration as the first outer shell stopper 36 described above. That is, the second outer shell stopper 45 is also formed of an elastic material and is supported by the second outer shell support 451 having a 'ㅁ' shape, and the second outer shell support 451 has a plurality of second outer support ribs 452. ) Is extended.

As shown in FIG. 8, the third support part 50 is spaced apart from the second support part 40, and is interposed between the inner tank T1 and the upper part of the outer tub T2 by at least one pair, and the inner tub T1 and the outer tub T2. Support). The third support part 50 is provided with an interference member 56 that interferes with the rolling range of the inner tub T1 with respect to the outer tub T2, and is provided in multiple rows to be spaced apart from each other in the longitudinal direction L. To this end, the third support part 50 includes a third insulation member 51, a third insulation support portion 52, and an interference member 56.

Here, the third insulation member 51 and the third insulation support portion 52 have the same configuration as the second insulation member 41 and the second insulation support portion 42 of the second support portion 40. That is, the third insulation member 51 is formed of an elastic material of a rectangular parallelepiped having an inclined surface 511. In addition, the third heat insulating support part 52 includes a third inner tub reinforcement body 53, a third outer tub reinforcement body 54, and a third outer tub reinforcement body 55. The third outer tub stopper 55 is formed of an elastic material and is supported by the third outer tubular support 551 having a 'ㅁ' shape, and the third outer tubing support rib 552 extends from the third outer tubular support 551. Reinforce bearing capacity.

The third insulation member 51 has a non-constrained surface 512 that is unconstrained with respect to the third inner tub reinforcement 53, like the first and second insulation members 41, but the non-constrained surface 512. The surface opposite to is bonded to and constrained to the third outer shell reinforcement 54. That is, all of the first to third heat insulating members 31, 41 and 51 are restrained with respect to the outer tub T2 and are not restrained with respect to the inner tub T1 to support the volume change of the inner tub T1.

The interference member 56 restricts the range of motion of the third insulation member 51. More specifically, as shown in Figs. 8 and 9, it protrudes from the third inner tub reinforcement body 53 to regulate the range of motion between the third insulating member 51 and the inner tub T1. That is, as shown in FIG. 9, even if a volume change of the inner tub T1 occurs and a movement occurs, the interference member 56 protruding from the third inner tub reinforcement 53 contacts the third insulating member 51. By limiting the movement range to prevent breakage of the inner tank (T1).

For reference, in FIGS. 8 and 9, only the interference member 56 protrudes so as to interfere with the rolling of the inner tub T1 in the circumferential direction R, but also the sliding in the longitudinal direction L. Naturally, it may be arranged to interfere. That is, a plurality of interference members 56 may be provided to face each other with the third insulation member 51 interposed therebetween, and the third insulation member 51 may be formed not only in the longitudinal direction L but also in the circumferential direction R. No wonder it could be arranged to regulate movement.

On the other hand, since the interference member 56 protrudes against the third inner tank reinforcement 53 in close contact with the inner tank T1 rather than the outer tank T2, the movement of the inner tank T1 in which LNG is stored can be directly limited. have. Therefore, the damage to the LNG double storage tank (T) impact due to the movement of the hull (S) can be significantly reduced.

Meanwhile, referring to FIG. 10, some of the plurality of first support parts 30 arranged in a plurality of rows at a lower portion between the inner tub T1 and the outer tub T2 may include a first insulation member 31 having an inner tub T1 and an outer tub. It may be provided to fix both rolling and sliding movement with respect to (T2). That is, as shown in FIG. 10, the first inner shell fixing body 351 ′ which fixes the first inner shell stopper 35 of the first supporting portion 30 ′ is the first outer shell support 361 shown in FIGS. 5 and 6. As described above, by having a '?' Shape surrounding the circumference of the first insulation member 31, the rolling and sliding movement of the first insulation member 31 is regulated between the inner tub T1 and the outer tub T2. The first inner tank fixing rib 352 'is extended to the first inner tank fixing body 351' to reinforce the fixing force.

The support operation of the LNG dual storage tank support device 1 having the above configuration will be described with reference to the drawings.

First, when the heat shrinkage deformation of the inner tank T1 occurs due to the cryogenic temperature of the LNG stored in the inner tank T1, all of the first to third insulation members 31, 41, 51 are connected to the inner tank T1. By having the non-constrained surfaces 312, 412 and 512 unconstrained, the movement of the inner tank T1 is supported, and the shock applied to the inner tank T1 is absorbed by the elastic material property. At this time, when the movement of the inner tub T1 is to be out of the preset range, the interference member 56 of the third supporting part 50 is in contact with the third insulating member 51, thereby making the inner tub (T2) with respect to the outer tub T2 ( The range of motion of T1) can be regulated.

Therefore, the inner tank T1 is slid or rolled over the outer tank T2 by a certain range or more, thereby improving safety problems such as shaking caused by the stored LNG.

In addition, the LNG dual storage tank (T) is seated on the fixed surface 111 of the fixing member 11 is supported to the side, the pressing member 12 is pressurized to face each other with the LNG dual storage tank (T) in between. Thereby, the LNG dual storage tank (T) can be prevented from being separated by the flow or the hull (S) flow.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1: LNG dual storage tank support device 10: fixed unit
11: fixing member 12: pressing member
20: support unit 30: first support
31: first insulation member 32: first insulation support
40: second support portion 41: first heat insulating member
42: second heat insulating support portion 50: third support portion
51: third insulation member 52: third insulation support portion
56: interference member T: tank
T1: inner tank T2: outer tank

Claims (4)

In the LNG dual storage tank support device for supporting an LNG double storage tank including an inner tank in which LNG is stored and an outer tank surrounding the inner tank,
A fixed unit configured to fix the LNG dual storage tank with respect to the hull; And
A support unit provided between the inner tank and the outer tank of the LNG dual storage tank and movably supporting the inner tank within a range set for the outer tank in association with a volume change of the inner tank;
Including;
The support unit is a LNG dual storage tank support device protruding toward the outer tank with respect to the inner tank is provided with an interference projection to selectively interfere with some of the plurality of heat insulating members provided between the inner tank and the outer tank. The method of claim 1,
The fixed unit,
A fixing member fixed to the hull and having a fixing surface which is in close contact with the outer tank; And
A pressing member provided in the fixing member to be in close contact with the outer tub so as to be movable between a pressing position for pressing the outer tub and a non-pressing position for intruding the outer tub out of the pressing position;
LNG dual storage tank support device comprising a. The method of claim 2,
The fixing surface of the fixing member is provided to extend from the lower portion of the LNG dual storage tank to the side of the LNG dual storage tank,
The pressurizing member is provided in a pair so as to face each other with the LNG dual storage tank therebetween, rotatably coupled to the upper end of the fixing member for the LNG dual storage tank rotatable between the pressurized position and the non-pressurized position Device.


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