KR20140045736A - Device for reducing sloshing of lng storage tank - Google Patents

Device for reducing sloshing of lng storage tank Download PDF

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Publication number
KR20140045736A
KR20140045736A KR1020120111849A KR20120111849A KR20140045736A KR 20140045736 A KR20140045736 A KR 20140045736A KR 1020120111849 A KR1020120111849 A KR 1020120111849A KR 20120111849 A KR20120111849 A KR 20120111849A KR 20140045736 A KR20140045736 A KR 20140045736A
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KR
South Korea
Prior art keywords
storage tank
sloshing
lng
lng storage
reducing
Prior art date
Application number
KR1020120111849A
Other languages
Korean (ko)
Inventor
전수성
정준형
송명재
Original Assignee
대우조선해양 주식회사
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Priority to KR1020120111849A priority Critical patent/KR20140045736A/en
Publication of KR20140045736A publication Critical patent/KR20140045736A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/52—Anti-slosh devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0325—Aerogel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

An apparatus for reducing sloshing of an LNG storage tank is disclosed. The sloshing reduction apparatus of the LNG storage tank of this invention is the sloshing reduction apparatus provided in an LNG storage tank, Comprising: The sloshing reduction plate which floats on the free surface of LNG stored in an LNG storage tank; And a support connecting the inner wall of the LNG storage tank and the sloshing reducing plate.

Description

Device For Reducing Sloshing Of LNG Storage Tank

The present invention relates to a sloshing reduction device for an LNG storage tank, and more particularly, to a sloshing LNG storage tank including a sloshing reducing plate floating on a free surface of LNG and a support part connecting the inner wall of the LNG storage tank. It relates to a singh reduction device.

Representative materials transported in liquid form include crude oil, liquefied natural gas (LNG), liquefied carbon dioxide, and liquefied petroleum gas (LPG).

When transportation is required due to different production area and consumer destination, the object may be the original liquid at room temperature, but it may be transported by liquefaction to reduce the volume during transportation.

In particular, natural gas is transported in a gaseous state via land or sea gas pipelines, or is transported to a distant consumer where it is stored in an LNG carrier in the state of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at a very low temperature (about -163 ° C), and its volume is reduced to about 1/600 of that of natural gas, which is suitable for long distance transportation through the sea.

LNG transport vessels that transport LNG to the sea by landing on land, or LNG transport vessels that transport LNG to the sea and then land on land, then regasification of LNG and unloading in the form of natural gas. Regasification Vessel ) Includes a cryogenic storage tank (often referred to as a 'hold') of liquefied natural gas.

Recently, the demand for floating offshore structures such as LNG Floating, Production, Storage Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU) is increasing, and these floating offshore structures are also installed on LNG carriers or LNG RVs. Storage tank is included.

Sloshing refers to a phenomenon in which a liquid substance contained in a storage tank flows when a vessel moves in various sea conditions, and the wall surface of the storage tank is severely impacted by sloshing. This sloshing phenomenon occurs more severely in partial retries. It is known that the storage tank receives the greatest sloshing load when the liquid cargo is partially loaded at about 30-50%.

Since the sloshing phenomenon inevitably occurs during the operation of the ship, it is necessary to design the storage tank structure to have sufficient strength to withstand the load caused by the sloshing.

Membrane-type storage tanks, a type of LNG storage tank, are difficult to install reinforcement inside, so the top and bottom chamfers inclined at an angle of about 45 degrees to the upper and lower sides of the storage tank to reduce sloshing load. A method of forming is proposed. However, in the case of a conventional membrane type storage tank having a chamfer, the deformation of the storage tank can withstand a certain load, but it can also be operated only under standard loading conditions and the impact force by sloshing for partial loading conditions. Could not bear enough.

In addition, liquid cargo carriers such as LNG storage tanks also tend to be enlarged as the vessel is enlarged, and thus the load due to the sloshing phenomenon, that is, the impact force of the sloshing, is increasing, and studies to safely support it continue. have.

1 illustrates a cargo tank of an LNG ship having a sloshing relief protrusion disclosed in Korean Utility Model Registration No. 20-278175.

As shown in FIG. 1, a plurality of diaphragms 13 are installed on the upper wall 11 and the lower wall 12 of the cargo tank 10 having a rectangular parallelepiped shape, and sloshing longer than the length of the diaphragm 13. It is a structure in which a plurality of releasing protrusions 14 are provided.

This prior art can reduce some of the flow of liquid, but the longitudinally standing diaphragm or protrusion inside the tank is less structurally stable and increases the weight of the storage tank, and due to the thickness of the diaphragm the storage space in the tank This was a wasteful drawback.

The present invention is to solve the conventional problems as described above, the tank through the sloshing reduction device including a sloshing reduction plate floating on the free surface of the LNG, and a support for connecting it to the inner wall of the LNG storage tank, It is intended to effectively reduce the sloshing of LNG without taking up a lot of storage space.

According to one aspect of the invention, in the sloshing (sloshing) reduction device provided in the LNG storage tank,

A sloshing reducing plate floating on the free water surface of the LNG stored in the LNG storage tank; And

There is provided a sloshing reduction apparatus for an LNG storage tank including a support portion connecting the inner wall of the LNG storage tank and the sloshing reduction plate.

A plurality of holes through which LNG passes may be formed on a surface of the sloshing reducing plate.

The sloshing reducing plate may be made of an airgel.

The support part may include a plurality of fixing pins provided on the inner wall of the LNG storage tank, and a plurality of wires that connect the plurality of fixing pins and the sloshing reduction plate and have a length adjustable.

The plurality of wires may be adjusted in length according to the height of the LNG free surface of the LNG storage tank to connect the fixing pin and the sloshing reducing plate so that the sloshing reducing plate floats on the LNG free surface.

The plurality of fixing pins may be provided on the upper or lower portion of the inner wall of the LNG storage tank.

According to another aspect of the present invention, in the sloshing reduction method of the LNG storage tank,

Floating a plurality of airgel plate on the free surface of the LNG stored in the LNG storage tank, the airgel plate is connected to the inner wall of the LNG storage tank with a plurality of wires, the air surface according to the free surface height of the LNG stored in the LNG storage tank A method for reducing sloshing of an LNG storage tank is provided, wherein the plurality of airgel plates are suspended on the free surface of the LNG by adjusting the length of the wire.

The sloshing reducing device of the LNG storage tank of the present invention includes a sloshing reducing plate floating on the free water surface of LNG and a support portion connecting the inner wall of the LNG storage tank, so that the LNG storage tank does not occupy much storage space in the tank. The sloshing of the can be reduced effectively.

1 shows a cargo tank of an LNG ship having a sloshing relief protrusion.
Figure 2 is a perspective view schematically showing the appearance of the LNG storage tank is provided with a sloshing reduction device according to an embodiment of the present invention.
FIG. 3 is an enlarged view illustrating only a sloshing reducing plate in the embodiment shown in FIG. 2.

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

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

Figure 2 is a perspective view schematically showing the appearance of the LNG storage tank T is provided with a sloshing reduction device according to an embodiment of the present invention, Figure 3 is a sloshing reduction plate 100 in the embodiment of FIG. Zoom in.

As shown in Figures 2 and 3, the sloshing reducing device of the LNG storage tank (T) according to an embodiment of the present invention, in the sloshing (sloshing) reducing device provided in the LNG storage tank (T), The sloshing reducing plate 100 floating on the free surface of the LNG stored in the LNG storage tank (T), and the support 200 for connecting the inner wall of the LNG storage tank (T) and the sloshing reducing plate 100. do.

Free surface or free surface is an interface between a liquid and a gas. That is to say the surface of the liquid commonly referred to. When the liquid surface is wide, it becomes horizontal by gravity, but when the liquid is small, the surface tension is applied to form a concave or convex sphere.

The sloshing reducing plate 100 of the present embodiment is arranged to float on the free surface of LNG stored in the LNG storage tank T, and a plurality of holes through which LNG passes through the surface of the sloshing reducing plate 100 ( holes 150 may be formed.

The sloshing reduction plate 100 may be made of an airgel.

Aerogel (aerogel) is made of silicon oxide (SiO 2 ), which is a new material having an ultra-light properties by including air that occupies 98% of the total volume between them. Aerogels are being actively researched into materials such as insulation, shock absorbers, and sound insulation materials due to their strong properties such as heat, electricity, sound, and impact.

This embodiment is intended to be applied to the material of the sloshing reducing plate 100 that can attenuate the sloshing of cryogenic LNG in consideration of the characteristics of the airgel. The aerogels are flexible and can move together while suppressing the flow of LNG on the free surface of the flowing LNG.

Due to the low density characteristics, the aerogel sloshing reduction plate 100 having a large surface area relative to the weight is suspended on the free surface of LNG, thereby preventing sloshing generated in the storage tank by interfering with the flow movement of the LNG located below it. To reduce.

Since the airgel is denser or higher than LNG, a buoyancy material (not shown) for floating it on the free surface of LNG may be provided in the sloshing reducing plate 100.

The support part 200 connects a plurality of fixing pins 210 provided on the inner wall of the LNG storage tank T, a plurality of fixing pins 210 and a sloshing reduction plate 100, and a plurality of wires of which length is adjustable. , 220).

As the flow of LNG in the LNG storage tank T prevents the sloshing reducing plate 100 from being turned upside down or the plural sloshing reducing plates 100 are entangled with each other, the sloshing reducing plate 100 prevents the Even during flow, the fixed pin 210 and the wire 220 are connected to the inner wall of the LNG storage tank T so as not to deviate from a predetermined range of positions in the LNG storage tank T. The sloshing reduction plate 100 may be fixed to the LNG storage tank T inner wall by connecting two fixing pins 210 and wires 220 diagonally to the plate surface, or three or more fixing pins 210. And wire 220 may be provided.

The plurality of wires 220 are length-adjusted according to the height of the LNG free surface of the LNG storage tank T to connect the fixing pin 210 and the sloshing reducing plate 100, thereby the sloshing reducing plate 100 is Allows to float on LNG free surface. The fixing pin 210 and the wire 220 may be made of a material that is durable against cryogenic LNG.

Since the amount of LNG stored in the LNG storage tank T may vary, the height of the free surface may also vary accordingly. In consideration of the height of the free surface, by adjusting the length of the wire 220 connected to the sloshing reduction plate 100, the sloshing reduction plate 100 can be floated on the free surface even if the height of the LNG free surface is changed. .

A plurality of fixing pins 210 may be provided on the upper or lower portion of the inner wall of the LNG storage tank (T).

The plurality of fixing pins 210 may be welded to the upper or lower portion of the inner wall of the LNG storage tank T, and the sloshing reduction plate 100 may be adjusted by adjusting the length of the wire 220 in consideration of the height of the LNG free surface. To float.

According to another aspect of the present invention, in the sloshing reduction method of the LNG storage tank (T),

Floating a plurality of airgel plate on the free surface of the LNG stored in the LNG storage tank (T), the airgel plate is connected to the inner wall of the LNG storage tank (T) with a plurality of wires 220, the LNG storage tank (T) A method of reducing sloshing of an LNG storage tank (T) is provided by floating a plurality of airgel plates on the free surface of LNG by adjusting the length of the wire 220 in accordance with the free surface height of the stored LNG.

As described above, the sloshing reduction device of the LNG storage tank of the present embodiment includes a sloshing reduction plate 100 floating on the free water surface of the LNG, and a support portion 200 connecting the inner wall of the LNG storage tank. . The sloshing reducing plate 100 may be made of a low density aerogel as a material to cover the free LNG surface without significantly increasing the weight of the LNG storage tank, thereby effectively reducing the sloshing in the tank.

In addition, the present embodiment by adjusting the length of the wire 220 connected to the sloshing reduction plate 100 and floating the sloshing reduction plate 100 on the free surface even if the height of the LNG free surface is changed according to the LNG loading amount Sloshing can be attenuated.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

T: LNG Storage Tank
100: sloshing reduction plate
150: hole
200:
210: push pin
220: wire

Claims (7)

In the sloshing reduction device provided in the LNG storage tank,
A sloshing reducing plate floating on the free water surface of the LNG stored in the LNG storage tank; And
An apparatus for reducing sloshing of an LNG storage tank including a support portion connecting the inner wall of the LNG storage tank and the sloshing reducing plate. The method of claim 1,
An apparatus for reducing sloshing of an LNG storage tank, wherein a plurality of holes through which LNG passes are formed on a surface of the sloshing reducing plate. The method of claim 1,
The sloshing reducing plate is a sloshing reducing device of the LNG storage tank, characterized in that the airgel. 2. The apparatus of claim 1,
A plurality of fixing pins provided on an inner wall of the LNG storage tank; And
An apparatus for reducing sloshing of an LNG storage tank comprising a plurality of wires of which length is adjustable and connects the plurality of fixing pins and the sloshing reducing plate. 5. The method of claim 4,
The plurality of wires are adjusted in length according to the height of the LNG free surface of the LNG storage tank to connect the fixing pin and the sloshing reducing plate, so that the sloshing reducing plate floats on the LNG free surface. Sloshing reduction device for LNG storage tank. 5. The method of claim 4,
The plurality of fixing pins are sloshing reduction device of the LNG storage tank, characterized in that provided on the upper or lower portion of the inner wall of the LNG storage tank. In the sloshing reduction method of the LNG storage tank,
Floating a plurality of airgel plate on the free surface of the LNG stored in the LNG storage tank, the airgel plate is connected to the inner wall of the LNG storage tank with a plurality of wires, the air surface according to the free surface height of the LNG stored in the LNG storage tank A method of reducing sloshing of an LNG storage tank, wherein the plurality of airgel plates are suspended on a free surface of the LNG by adjusting a length of a wire.
KR1020120111849A 2012-10-09 2012-10-09 Device for reducing sloshing of lng storage tank KR20140045736A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200137447A (en) * 2019-05-30 2020-12-09 울산과학대학교 산학협력단 Sloshing preventive apparatus
KR20200140602A (en) 2019-06-07 2020-12-16 삼성중공업 주식회사 Cargo tank having sloshing reduction structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200137447A (en) * 2019-05-30 2020-12-09 울산과학대학교 산학협력단 Sloshing preventive apparatus
KR20200140602A (en) 2019-06-07 2020-12-16 삼성중공업 주식회사 Cargo tank having sloshing reduction structure

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