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KR20160002530A - Liquefied gas storage tank and marine structure including the same - Google Patents

Liquefied gas storage tank and marine structure including the same Download PDF

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Publication number
KR20160002530A
KR20160002530A KR1020140081107A KR20140081107A KR20160002530A KR 20160002530 A KR20160002530 A KR 20160002530A KR 1020140081107 A KR1020140081107 A KR 1020140081107A KR 20140081107 A KR20140081107 A KR 20140081107A KR 20160002530 A KR20160002530 A KR 20160002530A
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KR
South Korea
Prior art keywords
liquefied gas
storage tank
suction
gas storage
gas
Prior art date
Application number
KR1020140081107A
Other languages
Korean (ko)
Inventor
오승훈
Original Assignee
현대중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020140081107A priority Critical patent/KR20160002530A/en
Publication of KR20160002530A publication Critical patent/KR20160002530A/en

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Classifications

    • 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
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/016—Preventing slosh

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

Abstract

The present invention relates to a liquefied gas storage tank and a marine structure including the same. The liquefied gas storage tank according to the present invention comprises: an evaporated gas absorption unit absorbing evaporated gas which is evaporated from liquefied gas in a storage space of the liquefied gas storage tank; an evaporated gas discharge unit discharging the evaporated gas toward the inside of the storage space to distribute sloshing energy; a flow direction metering device sensing the flow direction of the liquefied gas and outputting a flow direction signal; and an absorption and discharge control unit connected to the evaporated gas absorption unit and the evaporated gas discharge unit to detect the flow direction signal received from the flow direction metering device and to control whether the evaporated gas is absorbed or discharged. The liquefied gas storage tank and the marine structure having the same according to an embodiment of the present invention installs a sloshing load reducing device which can discharge the evaporated gas from the side wall and the ceiling of the liquefied gas storage tank to distribute the sloshing energy, thereby being capable of reducing a sloshing load applied to the side wall and the ceiling of the liquefied gas storage tank because of a sloshing phenomenon, so the stability of the liquefied gas storage tank may be ensured and the liquefied gas storage tank may be implemented to have an ultra-large size.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquefied gas storage tank and an offshore structure having the liquefied gas storage tank,

The present invention relates to a liquefied gas storage tank and a vessel having the same.

In recent years, liquefied gas such as Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG) and the like has been widely used as a substitute for gasoline or diesel.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made from compressed propane (C 3 H 8 ) and butane (C 4 H 10 ), which are derived from petroleum in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such a liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a transportation means navigating the ocean. Liquefied natural gas is reduced to 1/600 volume by liquefaction, Liquefied petroleum gas has the advantage of liquefaction, which reduces the volume of propane to 1/260 and the volume of butane to 1/230, which is high storage efficiency.

For example, liquefied natural gas (LNG) is obtained by cooling natural gas at a cryogenic temperature (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, .

LNG carrier (LNG carrier) that carries LNG and carries on the sea to unload LNG to land demand, or LNG RV (Regasification Vessel) that carries LNG to land in the sea, , LNG FPSO (Floating, Production, Storage and Offloading) used to transport LNG to the LNG carrier, and LNG unloaded from the LNG carrier at sea The LNG FSRU (Floating Storage and Regasification Unit), which is used to vaporize LNG and supply it to the customers on demand as needed, includes a storage tank (also called a 'cargo hold') capable of withstanding cryogenic temperatures of LNG.

Thus, a storage tank for storing LNG in a cryogenic liquid state is installed in an offshore structure such as an LNG carrier, LNG carrier, LNG FPSO, and LNG FSRU for transporting or storing liquefied gas such as LNG.

These storage tanks can be classified into independent type and membrane type depending on whether the load of the cargo directly acts on the heat insulating material. Typically, the membrane type storage tanks are classified into NO 96 type and Mark III Type storage tanks are divided into MOSS type and IHI-SPB type.

Typically, of the membrane-type storage tanks, the NO 96 type storage tank comprises a primary barrier and a secondary barrier made of Invar steel (36% Ni), a plywood box and a perlite, The Mark III type storage tank is composed of a primary barrier made of a stainless steel membrane and a primary barrier made of a triple- triplex and a primary insulation wall and a secondary insulation wall made of a polyurethane foam or the like are alternately stacked on the inner surface of the hull.

The independent storage tank is made by attaching a relatively hard insulating panel such as polyurethane to a tank body made of an alloy resistant to low temperature such as aluminum alloy, SUS, and 9% nickel, and a plurality of tanks Is placed on a support.

Even when the liquefied gas such as LNG or LPG is filled in the storage tank, even if vibration of the ship occurs due to waves or the like, impact due to sloshing on the side wall and ceiling structure of the storage tank due to the flow of the liquid Almost never delivered. Sloshing is a phenomenon in which a liquid substance, that is, LNG flows, stored in a storage tank when a ship or a floating structure moves in various sea states. When there is empty space inside the storage tank, that is, when there is liquefied gas in some space, the wall surface and the ceiling of the storage tank are severely impacted by sloshing due to fluid flow.

Damage to the inside of the storage tank due to such sloshing tends to increase as the size of the storage tank becomes larger, which is a great limitation in determining the size of such a storage tank.

Therefore, such a sloshing phenomenon necessarily occurs during the operation of a ship, so that it is necessary to design a storage tank structure so as to have sufficient strength to withstand the load caused by sloshing, or to provide a storage tank having a sloshing reduction function .

Korean Patent Publication No. 10-2010-0076152 (published on July 06, 2010)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquefied gas storage device capable of reducing a sloshing load applied to a sidewall or ceiling of a liquefied gas storage tank due to a sloshing phenomenon, Tank and an offshore structure having the same.

It is another object of the present invention to provide a liquefied gas storage tank capable of securing stability of a liquefied gas storage tank through reduction of a sloshing load applied to a side wall or ceiling of a liquefied gas storage tank, A storage tank and an offshore structure having the same.

According to an aspect of the present invention, there is provided a liquefied gas storage tank comprising: a vaporizing gas inlet for sucking a vaporized gas vaporized from a liquefied gas in a storage space of a liquefied gas storage tank; A vaporizing gas spouting unit for spraying the vaporized gas toward the inside of the storage space to disperse sloshing energy; A flow direction measuring device for sensing a flow direction of the liquefied gas and outputting a flow direction signal; And a suction / discharge control unit connected to the vaporizing gas suction unit and the vaporizing gas discharge unit to detect the flow direction signal received from the flow direction measurement unit, and to control whether the vaporized gas is sucked and spouted .

Specifically, the liquefied gas storage tank includes a left lateral wall and a right lateral wall formed in the longitudinal direction of the offshore structure, front and rear partition walls formed between the left and right lateral walls, a floor, a ceiling, and a chamfer, The left lateral wall, the right lateral wall, the front bulkhead, and the rear bulkhead.

Specifically, the vaporizing gas sucking part is constituted by a suction line in which the suction port is located in the storage space, the suction line is connected to the suction / discharge control part through the ceiling of the liquefied gas storage tank, At least one or more valves may be provided and the valve may be opened or closed under the control of the suction / discharge control unit.

Specifically, the inlet port may be located at an upper side of the storage space at least higher than the highest level of the liquefied gas.

Specifically, the vaporizing gas blowing unit may include: a blowing line unit connected to the suction blowing control unit; And an ejection nozzle unit connected to the ejection line unit and ejecting the vaporized gas into the storage space.

Specifically, the ejection line section is divided into one side ejection line and the other side ejection line with reference to the suction ejection control section, and at least one valve is installed in each of the one side ejection line and the other side ejection line, The valve can be selectively opened and closed according to the control signal.

Specifically, the ejection nozzle unit includes a plurality of nozzles connected to the one side ejection line and the other side ejection line, and each of the plurality of nozzles passes through a side wall, a ceiling, and a chamfered portion of the liquefied gas storage tank, And the plurality of nozzles may be provided with valves and selectively opened and closed under the control of the suction and discharge control unit.

Specifically, a plurality of the flow direction measuring devices may be installed on the bottom of the liquefied gas storage tank.

The liquefied gas storage tank and the marine structure having the liquefied gas storage tank according to the embodiments of the present invention are provided with the sloshing load reduction device capable of dispersing the sloshing energy by spraying the vaporized gas from the side wall and ceiling of the liquefied gas storage tank, It is possible to reduce the sloshing load applied to the sidewalls and the ceiling of the liquefied gas storage tank owing to the sloshing phenomenon, thereby securing the stability of the liquefied gas storage tank and realizing a very large size of the liquefied gas storage tank.

The liquefied gas storage tank and the offshore structure having the liquefied gas storage tank according to the embodiments of the present invention may be provided with a sloshing load reduction device capable of forming a sloshing layer on the water surface of the liquefied gas stored in the liquefied gas storage tank, It is possible to reduce the sloshing load applied to the sidewalls and the ceiling of the liquefied gas storage tank due to the development, thereby securing the stability of the liquefied gas storage tank and realizing a very large size of the liquefied gas storage tank.

1 is a plan view of an offshore structure having a liquefied gas storage tank according to a first or second embodiment of the present invention.
2 is a cross-sectional view for explaining the basic configuration of a liquefied gas storage tank according to the first or second embodiment of the present invention.
3 is a cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
4 is a cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.

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

FIG. 1 is a plan view of an offshore structure having a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 2 is a sectional view for explaining the basic structure of a liquefied gas storage tank according to a first embodiment of the present invention 3 is a sectional view of the liquefied gas storage tank according to the first embodiment of the present invention.

1 to 3, the first liquefied gas storage tank 10 according to the first embodiment of the present invention includes a first sloshing load reducing apparatus 100. [

The first liquefied gas storage tank 10 stores a liquefied gas 14 such as LNG or LPG and includes a left lateral wall 11a and a right lateral wall 11b formed in the longitudinal direction of the offshore structure 1, The front and rear partition walls 11c and 11d formed between the lateral walls 11a and 11b and the bottom 12 and the ceiling 13. The storage space 15 is formed by this structure. The left and right side walls 11a and 11b and the front and rear partition walls 11c and 11d may be referred to as a side wall 11 of the first liquefied gas storage tank 10.

The first liquefied gas storage tank 10 has a chamfered portion formed at an angle to the side edge in the storage space 15 in order to reduce the sloshing force generated as the liquefied gas 14 stored in the storage space 15 flows, 16).

The first liquefied gas storage tank 10 may be a membrane-type liquefied gas storage tank or a stand-alone liquefied gas storage tank installed in the offshore structure 1.

In the above, the offshore structure 1 is a structure for transporting or storing the liquefied gas 14 at sea, for example, an LNG carrier, an LNG RV Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), and the like.

The first sloshing load reducing device 100 can be installed in the side wall 11 or the ceiling 13 of the first liquefied gas storage tank 10 and can be installed in the first liquefied gas storage tank 10 by the sloshing phenomenon of the liquefied gas 14. [ So that the sloshing impact load applied to the side wall 11 or the ceiling 13 of the gas storage tank 10 can be reduced. The first sloshing load reducing apparatus 100 may include a vaporizing gas inlet 110, a vaporizing gas outlet 120, a flow direction measuring device 130, and a suction / discharge controller 140.

The vaporizing gas suction unit 110 is capable of sucking the vaporized gas vaporized from the liquefied gas 14 in the storage space 15 of the first liquefied gas storage tank 10 and is connected to a suction / Can be connected.

The suction line 111 in which the suction port 112 is located in the storage space 15 can be connected to the suction and discharge control unit 140 to be described later through the ceiling 13 . At least one valve (not shown) may be installed in the suction line 111, and the valve may be opened or closed under the control of a suction / discharge control unit 140 to be described later.

It is preferable that the suction port 112 is positioned above the lower portion of the storage space 15. This is because even if the liquefied gas 14 is filled in the storage space 15 at the highest water level according to the regulation, (112) is not immersed in liquefied gas. That is, the inlet 112 should be located at the upper side of the storage space 15 at least higher than the highest level of the liquefied gas 14. [

The vaporizing gas spouting unit 120 discharges vaporized gas sucked from the vaporizing gas sucking unit 110 from the inner side of the side wall 11 and the ceiling 13 of the first liquefied gas storage tank 10 to the storage space 15, The sloshing energy can be dispersed. The vaporizing gas spouting unit 120 may include a spouting line unit 121 and a spouting nozzle unit 122.

The spray line unit 121 may be installed outside the first liquefied gas storage tank 10 to be connected to a suction and discharge control unit 140 to be described later and may supply the vaporized gas sucked through the vaporizing gas suction unit 110 And may be supplied to an ejection nozzle unit 122 to be described later. The ejection line section 121 can be divided into a single ejection line 121L and a second ejection line 121R based on the suction ejection control section 140 to be described later.

At least one valve (not shown) may be installed in each of the one side discharge line 121L and the other side discharge line 121R, and the valve may be selectively opened and closed under the control of the suction / discharge control unit 140 .

The jet nozzle unit 122 is connected to the one side jet line 121L and the other side jet line 121R and is connected to the side wall 11 of the first liquefied gas storage tank 10, the ceiling 13, the chamfered portion 16 And extend into the storage space 15. The vaporized gas supplied through the one side discharge line 121L and the other side discharge line 121R can be injected into the storage space 15. [

The ejection nozzle unit 122 may include a plurality of nozzles provided in the side wall 11, the ceiling 13, and the chamfered portion 16, and each of the plurality of nozzles 122N may include a valve And may be selectively opened and closed under the control of a suction / discharge control unit 140 to be described later.

The plurality of nozzles 122N provided in each of the side wall 11, the ceiling 13 and the chamfered portion 16 may be arranged in a matrix structure and the side walls 11, the ceiling 13, The sloshing energy applied to the sidewall 11, the ceiling 13, and the chamfered portion 16 can be reduced by distributing the sloshing energy by spraying the vaporized gas, .

The vaporizing gas spouting unit 120 includes left and right side walls 11a and 11b and front and rear partition walls 11c and 11d constituting a side wall 11 of the first liquefied gas storage tank 10, a ceiling 13, The sloshing phenomenon can be prevented by the left lateral wall 11a and the right lateral wall 11b formed in the longitudinal direction of the offshore structure 1, The sloshing load can be effectively reduced while the number of the installation holes is reduced by constructing the vaporizing gas to be ejected only to the left side wall 11a and the other side wall 11b.

The flow direction measuring device 130 may be installed on the bottom 12 of the first liquefied gas storage tank 10 and may sense the flow direction of the liquefied gas 14 and may be provided with a flow Directional signal can be output. The flow direction measuring device 130 may be a tilt sensor or a flow sensor.

The flow direction measuring device 130 can detect the direction in which the liquefied gas 14 flows by installing one at the central portion of the bottom 12 but there is a difference in the flow of the liquefied gas 14 It is preferable to provide a plurality of evenly arranged portions in several places on the floor 12.

The suction and discharge control unit 140 may be installed outside the first liquefied gas storage tank 10 and may be connected to the vaporizing gas suction unit 110 and the vaporizing gas spray unit 120, Directional signal received from the gas-liquid separator, so as to control whether the gas is sucked and whether or not the gas is sucked.

Specifically, when the flow direction signal indicating that the liquefied gas 14 is flowing in any direction from the flow direction measuring device 130 is received, the suction / discharge control unit 140 controls the suction line 111 So that the vaporized gas in the storage space 15 is sucked.

The suctioning and dispensing control unit 140 analyzes the received flow direction signal so as to open the valve provided on the one side discharge line 121L of the vaporizing gas spraying unit 120 when the left side wall is the left side wall 11a So that the vaporized gas is ejected into the storage space 15 through the plurality of nozzles 122N of the ejection nozzle unit 122 connected to the one ejection line 121L. At this time, the suction / ejection control unit 140 can control the valves installed in each of the restored nozzles 122N to be selectively opened. That is, when the level of the liquefied gas 14 is analyzed to be low by the level sensor (not shown) installed in the first liquefied gas storage tank 10, the suction / discharge control unit 140 controls only the left lateral wall 11a It is determined that the sloshing load is not applied to the ceiling 13 due to the influence of the sloshing load and the plurality of nozzles 122N provided in the left lateral wall 11a are opened and the plurality of nozzles 122N may be closed.

When the analyzed flow direction signal is on the right lateral wall 11b, the suction / discharge control unit 140 not only opens the valve provided on the other-side discharge line 121R of the gas-liquid discharge unit 120, The valve provided in the line 121L can be controlled to be closed.

FIG. 1 is a plan view of a marine structure having a liquefied gas storage tank according to a second embodiment of the present invention. FIG. 2 is a sectional view for explaining the basic structure of a liquefied gas storage tank according to a second embodiment of the present invention And Fig. 4 is a sectional view of the liquefied gas storage tank according to the second embodiment of the present invention.

As shown in FIGS. 1, 2 and 4, the second liquefied gas storage tank 20 according to the second embodiment of the present invention includes a second sloshing load reduction device 200.

The second liquefied gas storage tank 20 stores a liquefied gas 14 such as LNG or LPG and includes a left lateral wall 11a and a right lateral wall 11b formed in the longitudinal direction of the offshore structure 1, The front and rear partition walls 11c and 11d formed between the lateral walls 11a and 11b and the bottom 12 and the ceiling 13. The storage space 15 is formed by this structure. The left and right side walls 11a and 11b and the front and rear partition walls 11c and 11d may be referred to as a side wall 11 of the second liquefied gas storage tank 20.

The second liquefied gas storage tank 20 includes a chamfered portion formed at an angle to a side surface of the storage space 15 in order to reduce the sloshing force generated as the liquefied gas 14 stored in the storage space 15 flows, 16).

The second liquefied gas storage tank 20 may be a membrane liquefied gas storage tank or a stand-alone liquefied gas storage tank installed in the offshore structure 1.

In the above, the offshore structure 1 is a structure for transporting or storing the liquefied gas 14 at sea, for example, an LNG carrier, an LNG RV Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), and the like.

The second sloshing load reduction device 200 may be installed such that a layer 262 is formed on the surface of the liquefied gas 14 stored in the second liquefied gas storage tank 20, It is possible to reduce the sloshing impact load applied to the side wall 11 or the ceiling 13 of the second liquefied gas storage tank 20 due to the sloshing phenomenon. The second sloshing load reducing apparatus 200 may include a water spraying section 210, a pump 220, an ice seed member 230, a liquid convection apparatus 240, and a water injection control section 250 have.

The water jetting section 210 injects water into the storage space 15 of the second liquefied gas storage tank 20 so as to reduce the flow of the liquefied gas 14, The layer 262 may be formed. The water jetting section 210 may include a jetting line 211 and a jetting nozzle 212.

The jetting line 211 may be installed outside the second liquefied gas storage tank 20 to be connected to a water jetting control unit 250 to be described later. The water may be supplied to the jetting nozzle 212 .

The injection nozzle 212 is connected to the injection line 211 to pass through the chamfered portion 16 between the ceiling 13 or the ceiling 13 of the second liquefied gas storage tank 20 and the side wall 11, And the water supplied through the spray line 211 may be injected into the storage space 15. The water sprayed through the spray line 211 may be sprayed into the storage space 15. [

A plurality of the injection nozzles 212 may be provided in each of the ceiling 13 and the chambers 16 and each of the plurality of injection nozzles 212 may be provided with a valve And may be selectively opened and closed under the control of the controller 250.

The plurality of injection nozzles 212 may be arranged in a matrix structure.

In this case, the saline layer 262 can be formed in the second liquefied gas storage tank 20 by controlling the internal temperature of the storage space 15 of the second liquefied gas storage tank 20, for example, the LNG vaporization gas (BOG) when the stored liquefied gas 14 is LNG The sprayed water is changed into ice granules 261 at the moment of spraying and falls on the water surface of the liquefied gas 14 so as to be kept at a constant thickness And the sheave state can be maintained by the flow of the liquefied gas 14. [

Thus, the sheathing layer 262 covers the surface of the liquefied gas 14 as if it were a blanket, not only reduces the flow rate of the liquefied gas 14, but also reduces the resonant frequency of the liquefied gas 14 And the sloshing load can be reduced by avoiding the frequency of the exciting force (the slow flow of the liquefied gas) (the resonance frequency of the wave load causing the movement of the offshore structure).

The pump 220 may be installed in the jetting line 211 of the water jetting unit 210 and pressurize the water to jet the water through the jetting nozzle 212. The pump 220 can be driven by a water jetting controller 250 to be described later.

The ice seed member 230 may be installed on the side wall 11 of the second liquefied gas storage tank 20 so that the water sprayed from the water spraying unit 210 may be only the ice layer 263 on the side wall 11 can do.

If the ice layer 263 is not fixed to the ice seed member 230 and is present in the floating state on the water surface of the liquefied gas 14, it may act as a cause of increasing the sloshing load. 263 change the resonant frequency of the liquefied gas 14 together with the saliency layer 262 so as to further avoid the frequency of the excitation force and also act as a barrier to further reduce the sloshing load .

A plurality of liquid convection devices 240 may be installed at the water surface of the liquefied gas 14 so that they can freely move by the flow of the liquefied gas 14 and the shake state lava layer 262 is formed by a solid ice layer 263 (Not shown), and the state of the saliency layer 262 is not changed. The liquid convection device 240 may be configured to include a buoy 241, a flow sensor 242,

The buoys 241 can flow in a floating state on the water surface of the liquefied gas 14 to prevent the swollen layer 262 from being bonded to the ice lumps.

The flow sensor 242 can be installed inside the buoy 241 and can detect the motion of the buoy 241 and output a flow signal to the water injection controller 250 to be described later wirelessly.

The water jetting control unit 250 may be installed outside the second liquefied gas storage tank 20 and may be connected to the water jetting unit 210 to control the flow of the fluid received from the flow sensor 242 of the liquid convection apparatus 240. [ A signal can be detected to control whether water is jetted or not.

Specifically, the water injection control unit 250 controls the pump 220 to be driven when a flow signal indicating that the buoy 241 is flowing from the flow sensor 242 of the liquid convection apparatus 240 is received, The valve installed in the liquefied gas storage chamber 212 is opened to spray water into the storage space 15 so that the silicon dioxide layer 262 is formed on the water surface of the liquefied gas 14 to a predetermined thickness.

More specifically, the water injection control unit 250 analyzes the received flow signal, and if the movement of the buoy 241 is analyzed to be active, the saline layer 262 is formed thinly on the water surface of the liquefied gas 14 It is determined that the sloshing load is insufficient for reducing the load so that the water can be controlled to be sprayed through all or a part of the plurality of injection nozzles 212. If it is analyzed that the movement of the buoy 241 is weak, All the valves provided in the plurality of injection nozzles 212 are closed and the driving of the pump 220 is stopped to determine the thickness of the thinning layer 263 262 can be maintained at a constant thickness and to prevent the ice layer 263 from being in a floating state on the surface of the liquefied gas 14. [

As described above, the present embodiment includes a first sloshing load reduction device 100 capable of dispersing sloshing energy by spraying vaporized gas from the side wall 11 and the ceiling 13 of the first liquefied gas storage tank 10, Or by providing a second sloshing load reduction device 200 capable of forming a sloshing layer 262 on the surface of the liquefied gas 14 stored in the second liquefied gas storage tank 20, The sloshing load applied to the side wall 11 and the ceiling 13 of the liquefied gas storage tanks 10 and 20 can be reduced and the stability of the liquefied gas storage tanks 10 and 20 can be secured, It is possible to realize a very large size of the liquefied gas storage tanks 10 and 20.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: offshore structure 10, 20: first and second liquefied gas storage tanks
11: side wall 11a: left side wall
11b: right side wall 11c: front bulkhead
11d: rear bulkhead 122: bottom
13: ceiling 14: liquefied gas
15: storage space 16:
100, 200: first and second sloshing load reduction devices
110: vaporized gas suction part 111: suction line
112: inlet port 120: vaporizing gas spouting section
121: ejection line section 121L: one ejection line
121R: the other-side ejection line 122: the ejection nozzle portion
122N: nozzle 130: flow direction measuring device
140: Suction /
210: Water jetting section 211: Jet line
212: injection nozzle 220: pump
230: ice seed member 240: liquid convection device
241: Buoy 242: Flow sensor
250: Water injection control unit 261: Ice particles
262: Plasma layer 263: Ice layer

Claims (9)

A vaporizing gas suction unit for sucking the vaporized gas vaporized from the liquefied gas in a storage space of the liquefied gas storage tank;
A vaporizing gas spouting unit for spraying the vaporized gas toward the inside of the storage space to disperse sloshing energy;
A flow direction measuring device for sensing a flow direction of the liquefied gas and outputting a flow direction signal; And
And a suction / discharge control unit connected to the vaporization gas suction unit and the vaporization gas discharge unit to detect the flow direction signal received from the flow direction measurement unit and to control whether the vaporization gas is sucked and ejected. Liquefied gas storage tank. 2. The liquefied gas storage tank according to claim 1,
A left side wall and a right side wall formed in the longitudinal direction of the offshore structure, front and rear partition walls formed between the left and right side walls, a floor, a ceiling, and a chamfer,
The sidewall,
The right side wall, the front bulkhead, and the rear bulkhead. The exhaust gas purifying apparatus according to claim 1,
Wherein the suction port is constituted by a suction line located in the storage space,
The suction line passes through the ceiling of the liquefied gas storage tank and is connected to the suction /
Wherein at least one valve is installed in the suction line, and the valve is opened or closed under the control of the suction / discharge control unit. The air conditioner according to claim 3,
Is located on the upper side of the storage space at least higher than the highest level of the liquefied gas. The exhaust gas purifying apparatus according to claim 1,
An ejection line unit connected to the suction / ejection control unit; And
And an ejection nozzle connected to the ejection line unit for ejecting the vaporized gas into the storage space. 6. The apparatus according to claim 5,
And a second ejection line, which is divided into a first ejection line and a second ejection line,
Wherein at least one valve is provided in each of the one side blowing line and the other side blowing line so that the valve is selectively opened and closed under the control of the suction blowing control unit. 7. The apparatus according to claim 6,
And a plurality of nozzles connected to the one side ejection line and the other side ejection line,
Wherein each of the plurality of nozzles is installed so as to extend to the inside of the storage space through a side wall, a ceiling, and a chamfer of the liquefied gas storage tank,
Wherein each of the plurality of nozzles is provided with a valve and selectively opened and closed under the control of the suction and discharge control unit. The flow direction measuring device according to claim 1,
And a plurality of liquefied gas storage tanks are provided at the bottom of the liquefied gas storage tank. An offshore structure having a liquefied gas storage tank according to any one of claims 1 to 9.
KR1020140081107A 2014-06-30 2014-06-30 Liquefied gas storage tank and marine structure including the same KR20160002530A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180070122A1 (en) * 2016-09-02 2018-03-08 Lg Electronics Inc. Method for controlling source device at sink device and apparatus for the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100076152A (en) 2008-12-26 2010-07-06 현대중공업 주식회사 Porous plate system to mitigate the low filling level sloshing flow in lng ccs

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100076152A (en) 2008-12-26 2010-07-06 현대중공업 주식회사 Porous plate system to mitigate the low filling level sloshing flow in lng ccs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180070122A1 (en) * 2016-09-02 2018-03-08 Lg Electronics Inc. Method for controlling source device at sink device and apparatus for the same

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