WO2017014389A1 - Liquefied natural gas storage tank, and insulating wall of liquefied natural gas storage tank - Google Patents

Liquefied natural gas storage tank, and insulating wall of liquefied natural gas storage tank Download PDF

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Publication number
WO2017014389A1
WO2017014389A1 PCT/KR2016/001164 KR2016001164W WO2017014389A1 WO 2017014389 A1 WO2017014389 A1 WO 2017014389A1 KR 2016001164 W KR2016001164 W KR 2016001164W WO 2017014389 A1 WO2017014389 A1 WO 2017014389A1
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Prior art keywords
wall
natural gas
storage tank
sealing wall
liquefied natural
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PCT/KR2016/001164
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French (fr)
Korean (ko)
Inventor
표창민
허행성
강봉호
박광준
강중규
Original Assignee
대우조선해양 주식회사
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Publication of WO2017014389A1 publication Critical patent/WO2017014389A1/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
    • B65D90/02—Wall construction
    • B65D90/06—Coverings, e.g. for insulating purposes
    • 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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation

Definitions

  • the present invention relates to a tank for storing liquefied natural gas, and more particularly, to a membrane-type storage tank having a double insulation wall structure and an insulation wall constituting the same.
  • Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane and the like, and has recently been spotlighted as a low pollution energy source in various technical fields.
  • Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG).
  • Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (about -163 °C or less), and its volume is reduced to about 1/600 than natural gas in gas state, and is suitable for long distance transportation through sea.
  • Liquefied natural gas carriers are provided with storage tanks (also called cargo holds) for storing and storing liquefied natural gas cooled by liquefying natural gas.
  • the boiling point of liquefied natural gas is about -162 °C at atmospheric pressure, so the storage tank of liquefied natural gas is a material that can withstand ultra low temperatures such as aluminum steel, stainless steel, and 35% nickel steel to store and store liquefied natural gas safely. It can be manufactured, designed to be resistant to thermal stress and heat shrinkage, and to prevent thermal intrusion.
  • LNG transporter for loading and unloading LNG to land demand by loading sea
  • LNG ReVification Vessel which reloads LNG after recharging stored LNG after arriving at land demand by loading sea, recently unloading LNG
  • FPFP LNG Floating, Production, Storage and Offloading
  • FSRUs LNG Floating Storage and Regasification Units
  • the LNG FPSO is a floating offshore structure used to liquefy the produced natural gas directly from the sea and store it in a storage tank and, if necessary, to transport the LNG stored in the storage tank to an LNG carrier.
  • the LNG FSRU is a floating offshore structure that stores LNG unloaded from LNG carriers in a storage tank at sea far from the land, and then vaporizes LNG as needed to supply land demand.
  • a storage tank for storing LNG in a cryogenic state is installed in an offshore structure such as an LNG carrier, an LNG RV, an LNG FPSO, or an LNG FSRU that transports or stores a liquid cargo such as LNG.
  • These storage tanks can be classified into independent tank type and membrane type according to whether the load of the cargo directly acts on the insulation.
  • Membrane type storage tank is divided into GTT NO 96 type and TGZ Mark III type
  • independent tank type storage tank is divided into MOSS type and IHI-SPB type.
  • the TGZ Mark III type storage tank which is a form of a conventional LNG storage tank, has a structure in which a primary sealing wall, a primary insulating wall, a secondary sealing wall, and a secondary insulating wall are stacked.
  • the primary sealing wall is directly contacted with the liquefied natural gas stored in the storage tank, and is made of a 1.2 mm thick stainless steel membrane, and the secondary sealing wall is also made of stainless steel.
  • the primary heat insulating wall and the secondary heat insulating wall are made of polyurethane foam or the like. At this time, in order to fix the primary insulation wall and the secondary insulation wall to each other, the primary insulation wall, the secondary sealing wall and the secondary insulation wall are glued together.
  • stainless steel is an excellent material that can be used at cryogenic temperatures, but there is a big problem of thermal deformation.
  • the primary sealing wall made of stainless steel is wrinkled to be produced in preparation for thermal deformation.
  • the present invention has been made to solve the above-described problems, the present invention is a liquefied natural gas storage tank configured to prevent the interference with the insulating wall is stacked while the secondary sealing wall is formed of stainless steel and the insulation constituting the same The purpose is to provide a wall.
  • the liquefied natural gas storage tank includes a sealing wall formed of a stainless steel material for sealing a liquefied natural gas stored in an inner space, and joined to the sealing wall and provided to insulate the inner space from the outside. It includes a heat insulation wall, the sealing wall is formed with a corrugation portion to correspond to the thermal deformation, the heat insulation wall is characterized in that the groove is formed corresponding to the corrugation portion so that the wrinkle portion can be inserted.
  • the heat insulating wall is formed in a double upper and lower portion of the sealing wall, the upper sealing wall formed on the upper portion of the sealing wall is a primary sealing wall for primarily sealing the liquefied natural gas stored in the interior space It is characterized by more specific features formed.
  • the primary sealing wall is formed with a corrugation portion corresponding to the thermal deformation.
  • the groove is formed so that the wrinkle portion can be inserted into the heat insulating wall is formed of a chamfer formed by cutting the corners, and the curved portion forming the main curved surface.
  • the curved surface portion is characterized in that the curvature formed with the same curvature formed by the additional portion.
  • the insulating wall of the liquefied natural gas storage tank according to the present invention is provided to insulate the internal space of the liquefied natural gas storage tank from the outside, and is provided with a stainless steel material and formed with a corrugated portion formed with corrugations for thermal deformation. It is bonded with, characterized in that the groove is formed corresponding to the wrinkle portion so that the wrinkle portion can be inserted.
  • the grooves formed to correspond to the pleats are characterized in that the grooves are formed by cutting the edges and the curved portions forming the main curved surface.
  • the curved surface portion is characterized in that the curvature formed with the same curvature formed.
  • the use of stainless steel having excellent performance even at cryogenic temperature as a secondary sealing wall does not cause interference with the primary and secondary insulating walls It is possible to implement a liquefied natural gas storage tank.
  • the processing part can be reduced, thereby minimizing waste space without forming the heat insulating layer, thereby making it more efficient.
  • the chamfering portion is formed in the groove formed in the heat insulation wall, thereby preventing the wrinkle of the sealing wall and the heat insulation wall from interfering.
  • FIG. 1 schematically shows a part of a liquefied natural gas storage tank according to the present invention.
  • Figure 2 shows the secondary sealing wall of the liquefied natural gas storage tank according to the present invention.
  • FIG. 3 is an enlarged view of a portion of the secondary sealing wall of FIG. 2.
  • Figure 4 shows the relationship between the heat insulating wall and the sealing wall according to the present invention.
  • FIG. 1 schematically shows a part of a liquefied natural gas storage tank according to the present invention.
  • the LNG storage tank may include a primary sealing wall 110, a primary insulating wall 120, a secondary sealing wall 200, and a secondary insulating wall ( 300).
  • the primary sealing wall 110 is installed on the primary insulating wall 120 to contact the liquefied natural gas while the liquid liquefied natural gas (LNG) stored in the storage tank.
  • LNG liquid liquefied natural gas
  • the secondary sealing wall 200 is installed between the primary insulating wall 120 and the secondary insulating wall 300 serves to liquid-tighten the liquefied natural gas when the primary sealing wall 110 leaks.
  • a plurality of wrinkles are formed in the primary sealing wall 110 and the secondary sealing wall 200 in order to prevent breakage during shrinkage and extension due to temperature change.
  • the wrinkled portion is stretched or shrunk by a temperature change according to the loading of the liquefied natural gas to prevent breakage due to thermal deformation applied to the primary sealing wall 110 and the secondary sealing wall 200.
  • the primary sealing wall 110 and the secondary sealing wall 200 may be made of stainless steel.
  • FIG. 2 shows the secondary sealing wall 200
  • FIG. 3 shows an enlarged view of a part of the secondary sealing wall 200 shown in FIG. 2.
  • a plurality of wrinkles 210 formed in the secondary sealing wall 200 are formed in a lattice form horizontally and vertically.
  • the pleats 210 of the secondary sealing wall 200 in the present invention are molded to have a first curved surface 211 and a second curved surface 212.
  • the first curved surface 211 having a curved direction in a direction opposite to the second curved surface 212 is formed not only with the second curved surface 212 constituting the main curved surface and the edge is sharply formed. It is manufactured so as to be more suitable for the function as a wrinkle part for thermal deformation response.
  • the wrinkle portion 210 causes interference with these insulating walls. do.
  • grooves corresponding to the pleats 210 of the secondary sealing wall 200 are formed in the insulating wall of the liquefied natural gas storage tank according to the present invention.
  • the wrinkle part 210 of the secondary sealing wall 200 is formed in the direction of the secondary heat insulating wall 300, the groove is formed in the secondary heat insulating wall 300.
  • the present invention is not limited thereto, and the pleats 210 of the secondary sealing wall 200 are formed in the direction of the primary insulation wall 120, and grooves corresponding to the pleats 210 are formed in the primary insulation wall 120. May be
  • the grooves formed in the secondary insulation wall 300 are formed so as to minimize interference with the secondary sealing wall 200 while maximizing the insulation performance by minimizing the size of the grooves.
  • grooves 311 and chamfers and curved portions 312 are formed in the grooves of the secondary insulating wall 300.
  • the curvature 210 has a curvature corresponding to the second curved surface 212 and is formed to have a radius of about 2 to 3 mm larger than the outer edge of the second curved surface 212.
  • the chamfering portion 311 is formed to correspond to the first curved surface 211 of the wrinkled portion 210 of the secondary sealing wall 200, such that the curved portion 312 is the wrinkled portion 210 of the secondary sealing wall 200.
  • the starting point of the groove is not sharply bent, the chamfering portion 311 is formed to form a gentle inclination, the defect caused by contact with the secondary sealing wall 200 and the edge of the groove that may occur in the event of emergency Can be prevented.
  • the primary insulating wall 120 is located below the primary sealing wall 110 to insulate the liquefied natural gas
  • the secondary insulating wall 300 is installed on the inner wall of the liquefied natural gas storage tank is liquefied natural gas Insulate That is, the secondary insulation wall 300 is installed on the inner wall of the liquefied natural gas storage tank, and the secondary sealing wall 200 is positioned on the secondary insulation wall 300.
  • the primary heat insulation wall 120 and the secondary heat insulation wall 300 are formed of a top plate, a bottom plate, and a heat insulating material formed between the top plate and the bottom plate.
  • the upper plate and the lower plate is made of a plywood (Plywood) material, the insulation may be formed of polyurethane foam (Polyurethane Form).
  • the groove formed in the secondary heat insulation wall 300 of the present invention may have a shape in which the top plate and a part of the heat insulating material are removed.
  • first surface 212 second surface

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

Abstract

A liquefied natural gas storage tank according to the present invention comprises: a sealing wall made from a stainless steel material in order to seal the liquefied natural gas stored in an inner space; and an insulating wall joined to the sealing wall, and provided to insulate the inner space from the outside, wherein the sealing wall has a corrugated part formed for responding to thermal deformation and the insulating wall has a groove formed to correspond to the corrugated part such that the corrugated part can be inserted therein, and thus, even though the sealing wall is formed from stainless steel, interference thereof with the insulating wall stacked thereon is not generated.

Description

액화천연가스 저장탱크 및 액화천연가스 저장탱크의 단열벽Insulating wall of LNG storage tank and LNG storage tank
본 발명은 액화천연가스를 저장하는 탱크에 관한 것으로서, 특히 이중 단열벽 구조를 가지는 멤브레인형 저장탱크 및 그를 구성하는 단열벽에 관한 것이다.The present invention relates to a tank for storing liquefied natural gas, and more particularly, to a membrane-type storage tank having a double insulation wall structure and an insulation wall constituting the same.
천연가스(natural gas)는 메탄(methane)을 주성분으로 하고, 소량의 에탄(ethane), 프로판(propane) 등을 포함하는 화석연료로서, 최근 다양한 기술 분야에서 저공해 에너지원으로서 각광받고 있다.Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane and the like, and has recently been spotlighted as a low pollution energy source in various technical fields.
천연가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 또는 액화된 액화천연가스(LNG)의 상태로 LNG 수송선에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온(대략 -163℃ 이하)으로 냉각하여 얻어지는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대략 1/600로 줄어들어 해상을 통한 원거리 운반에 매우 적합하다.Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (about -163 ℃ or less), and its volume is reduced to about 1/600 than natural gas in gas state, and is suitable for long distance transportation through sea.
액화천연가스 운반선에는 천연가스를 냉각하여 액화시킨 액화천연가스를 보관 및 저장할 수 있는 저장탱크(cargo, 화물창이라고도 함)가 구비된다. 액화천연가스의 끓는점은 대기압에서 약 -162℃ 정도이므로, 액화천연가스의 저장탱크는 액화천연가스를 안전하게 보관하고 저장하기 위해 알루미늄강, 스테인리스강, 35% 니켈강 등과 같은 초저온에 견딜 수 있는 재료로 제작될 수 있으며, 열응력 및 열수축에 강인하고, 열침입을 막을 수 있는 구조로 설계된다.Liquefied natural gas carriers are provided with storage tanks (also called cargo holds) for storing and storing liquefied natural gas cooled by liquefying natural gas. The boiling point of liquefied natural gas is about -162 ℃ at atmospheric pressure, so the storage tank of liquefied natural gas is a material that can withstand ultra low temperatures such as aluminum steel, stainless steel, and 35% nickel steel to store and store liquefied natural gas safely. It can be manufactured, designed to be resistant to thermal stress and heat shrinkage, and to prevent thermal intrusion.
LNG를 싣고 바다를 운항하여 육상 수요처에 LNG를 하역하기 위한 LNG 수송선, LNG를 싣고 바다를 운항하여 육상 수요처에 도착한 후 저장된 LNG를 재기화하여 천연가스 상태로 하역하는 LNG RV(Regasification Vessel), 최근에는 LNG FPSO(Floating, Production, Storage and Offloading)나 LNG FSRU(Floating Storage and Regasification Unit)와 같은 부유식 해상 구조물에도 LNG 수송선이나 LNG RV에 설치되는 저장탱크가 포함된다.LNG transporter for loading and unloading LNG to land demand by loading sea, LNG ReVification Vessel (RV), which reloads LNG after recharging stored LNG after arriving at land demand by loading sea, recently unloading LNG This includes storage tanks installed on LNG carriers or LNG RVs, even on floating offshore structures such as LNG Floating, Production, Storage and Offloading (FPFP) or LNG Floating Storage and Regasification Units (FSRUs).
LNG FPSO는, 생산된 천연가스를 해상에서 직접 액화시켜 저장탱크 내에 저장하고, 필요 시 이 저장탱크 내에 저장된 LNG를 LNG 수송선으로 옮겨싣기 위해 사용되는 부유식 해상 구조물이다. 또 LNG FSRU는 육상으로부터 멀리 떨어진 해상에서 LNG 수송선으로부터 하역되는 LNG를 저장탱크에 저장한 후 필요에 따라 LNG를 기화시켜 육상수요처에 공급하는 부유식 해상 구조물이다.The LNG FPSO is a floating offshore structure used to liquefy the produced natural gas directly from the sea and store it in a storage tank and, if necessary, to transport the LNG stored in the storage tank to an LNG carrier. In addition, the LNG FSRU is a floating offshore structure that stores LNG unloaded from LNG carriers in a storage tank at sea far from the land, and then vaporizes LNG as needed to supply land demand.
이와 같이 LNG와 같은 액체화물을 해상에서 수송하거나 보관하는 LNG 수송선, LNG RV, LNG FPSO, LNG FSRU 등의 해상 구조물 내에는 LNG를 극저온 상태로 저장하기 위한 저장탱크가 설치되어 있다.As described above, a storage tank for storing LNG in a cryogenic state is installed in an offshore structure such as an LNG carrier, an LNG RV, an LNG FPSO, or an LNG FSRU that transports or stores a liquid cargo such as LNG.
이러한 저장탱크는 단열재에 화물의 하중이 직접적으로 작용하는지 여부에 따라 독립탱크형(Independent Tank)과 멤브레인형(Membrane Type)으로 분류할 수 있다. 멤브레인형 저장탱크는 GTT NO 96형과 TGZ Mark Ⅲ형으로 나눠지며, 독립탱크형 저장탱크는 MOSS형과 IHI-SPB형으로 나눠진다.These storage tanks can be classified into independent tank type and membrane type according to whether the load of the cargo directly acts on the insulation. Membrane type storage tank is divided into GTT NO 96 type and TGZ Mark III type, and independent tank type storage tank is divided into MOSS type and IHI-SPB type.
종래의 액화천연가스 저장탱크의 한 형태인 TGZ Mark Ⅲ형 저장탱크는 1차 밀봉벽, 1차 단열벽, 2차 밀봉벽 및 2차 단열벽이 적층되는 구조이다. 1차 밀봉벽은 저장탱크에 저장된 액화천연가스와 직접 접하는 부분으로서 1.2㎜ 두께의 스테인리스강 멤브레인(Membrane)으로 이루어지고, 2차 밀봉벽도 스테인리스 강으로 이루어진다.The TGZ Mark III type storage tank, which is a form of a conventional LNG storage tank, has a structure in which a primary sealing wall, a primary insulating wall, a secondary sealing wall, and a secondary insulating wall are stacked. The primary sealing wall is directly contacted with the liquefied natural gas stored in the storage tank, and is made of a 1.2 mm thick stainless steel membrane, and the secondary sealing wall is also made of stainless steel.
그리고, 1차 단열벽 및 2차 단열벽은 폴리우레탄 폼(polyurethane foam) 등으로 이루어진다. 이때, 1차 단열벽과 2차 단열벽을 서로 고정시키기 위해, 1차 단열벽과 2차 밀봉벽과 2차 단열벽을 접착제로 붙인다. The primary heat insulating wall and the secondary heat insulating wall are made of polyurethane foam or the like. At this time, in order to fix the primary insulation wall and the secondary insulation wall to each other, the primary insulation wall, the secondary sealing wall and the secondary insulation wall are glued together.
그런데, 스테인리스 강은 극저온에서 사용할 수 있는 우수한 재질이지만, 열변형이 큰 문제가 있다.By the way, stainless steel is an excellent material that can be used at cryogenic temperatures, but there is a big problem of thermal deformation.
그러므로, 스테인리스 강으로 구성되는 1차 밀봉벽에는 주름을 형성시켜 열변형에 대비하여 제작된다.Therefore, the primary sealing wall made of stainless steel is wrinkled to be produced in preparation for thermal deformation.
그러나, 2차 밀봉벽에 스테인리스 강이 사용되는 경우, 2차 밀봉벽에 주름을 형성시키면, 2차 밀봉벽의 상부에 적층되는 1차 단열벽과 간섭이 발생하거나, 2차 밀봉벽의 하부에 적층되는 2차 단열벽과 간섭이 발생되는 문제가 있다.However, when stainless steel is used for the secondary sealing wall, when the corrugation is formed in the secondary sealing wall, interference with the primary insulating wall laminated on the upper portion of the secondary sealing wall occurs, or in the lower portion of the secondary sealing wall. There is a problem that interference occurs with the secondary insulating wall being stacked.
본 발명은 상술한 문제점을 해결하고자 안출된 것으로서, 본 발명은 2차 밀봉벽이 스테인리스 강으로 형성되면서도, 이와 적층되는 단열벽과의 간섭이 발생되지 않도록 구성된 액화천연가스 저장탱크 및 이를 구성하는 단열벽을 제공하는 데 그 목적이 있다.The present invention has been made to solve the above-described problems, the present invention is a liquefied natural gas storage tank configured to prevent the interference with the insulating wall is stacked while the secondary sealing wall is formed of stainless steel and the insulation constituting the same The purpose is to provide a wall.
본 발명에 따른 액화천연가스 저장탱크는, 내부 공간에 저장되는 액화천연가스를 밀봉시키기 위해 스테인리스 스틸 소재로 마련되는 밀봉벽, 상기 밀봉벽과 접합되며, 상기 내부 공간을 외부와 단열시키기 위해 마련되는 단열벽을 포함하고, 상기 밀봉벽에는 열적 변형에 대응하기 위한 주름부가 형성되고, 상기 단열벽에는 상기 주름부가 삽입될 수 있도록 상기 주름부와 대응되게 홈이 형성된 것을 특징으로 한다.The liquefied natural gas storage tank according to the present invention includes a sealing wall formed of a stainless steel material for sealing a liquefied natural gas stored in an inner space, and joined to the sealing wall and provided to insulate the inner space from the outside. It includes a heat insulation wall, the sealing wall is formed with a corrugation portion to correspond to the thermal deformation, the heat insulation wall is characterized in that the groove is formed corresponding to the corrugation portion so that the wrinkle portion can be inserted.
상기 단열벽은 상기 밀봉벽의 상부와 하부에 이중으로 형성되며, 상기 밀봉벽의 상부에 형성되는 단열벽의 상부에는 내부 공간에 저장되는 액화천연가스를 1차적으로 밀봉시키기 위한 1차 밀봉벽이 형성된 것을 보다 구체적인 특징으로 한다.The heat insulating wall is formed in a double upper and lower portion of the sealing wall, the upper sealing wall formed on the upper portion of the sealing wall is a primary sealing wall for primarily sealing the liquefied natural gas stored in the interior space It is characterized by more specific features formed.
그리고, 상기 1차 밀봉벽에는 열적 변형에 대응하기 위한 주름부가 형성된다.In addition, the primary sealing wall is formed with a corrugation portion corresponding to the thermal deformation.
또한, 상기 단열벽에 상기 주름부가 삽입될 수 있도록 형성되는 홈은 모서리를 깎아서 형성시킨 면취부와, 주 곡면을 이루는 곡면부로 형성된다.In addition, the groove is formed so that the wrinkle portion can be inserted into the heat insulating wall is formed of a chamfer formed by cutting the corners, and the curved portion forming the main curved surface.
여기서, 상기 곡면부는 상기 주름부가 형성하는 곡률과 동일한 곡률로 형성되는 것을 추가적인 특징으로 한다.Here, the curved surface portion is characterized in that the curvature formed with the same curvature formed by the additional portion.
한편, 본 발명에 따른 액화천연가스 저장탱크의 단열벽은, 액화천연가스 저장탱크의 내부 공간을 외부와 단열시키기 위해 마련되며, 스테인리스 스틸 소재로 마련되고 열적 변형에 대응하기 위한 주름부가 형성된 밀봉벽과 접합되고, 상기 주름부가 삽입될 수 있도록 상기 주름부와 대응되게 홈이 형성된 것을 특징으로 한다.On the other hand, the insulating wall of the liquefied natural gas storage tank according to the present invention is provided to insulate the internal space of the liquefied natural gas storage tank from the outside, and is provided with a stainless steel material and formed with a corrugated portion formed with corrugations for thermal deformation. It is bonded with, characterized in that the groove is formed corresponding to the wrinkle portion so that the wrinkle portion can be inserted.
상기 주름부와 대응되게 형성되는 홈은 모서리를 깎아서 형성시킨 면취부와, 주 곡면을 이루는 곡면부로 형성된 것을 보다 구체적인 특징으로 한다.The grooves formed to correspond to the pleats are characterized in that the grooves are formed by cutting the edges and the curved portions forming the main curved surface.
그리고, 상기 곡면부는 상기 주름부가 형성하는 곡률과 동일한 곡률로 형성되는 것을 또한 특징으로 한다.In addition, the curved surface portion is characterized in that the curvature formed with the same curvature formed.
본 발명의 액화천연가스 저장탱크 및 액화천연가스 저장탱크의 단열벽에 의하면, 극저온에서도 우수한 성능을 갖는 스테인리스 강을 2차 밀봉벽으로 사용하면서도 1차, 2차 단열벽과의 간섭이 발생하지 않는 액화천연가스 저장탱크의 구현이 가능하다.According to the insulating wall of the liquefied natural gas storage tank and the liquefied natural gas storage tank of the present invention, the use of stainless steel having excellent performance even at cryogenic temperature as a secondary sealing wall does not cause interference with the primary and secondary insulating walls It is possible to implement a liquefied natural gas storage tank.
그리고, 단열벽에 형성시키는 홈을 최적화함으로써, 가공부를 줄일 수 있고, 그에 따라 단열층을 형성시키지 못하고 낭비되는 공간을 최소화하여 보다 효율적이다.Further, by optimizing the grooves formed in the heat insulating wall, the processing part can be reduced, thereby minimizing waste space without forming the heat insulating layer, thereby making it more efficient.
이러한 결과는 액화천연가스 저장탱크 내의 Boil-off rate(증발가스 발생률)를 작게 하는 결과를 가져오게 한다.This resulted in the reduction of the boil-off rate in the LNG storage tank.
또한, 단열벽에 형성되는 홈에 면취부가 형성됨으로써 밀봉벽의 주름과 단열벽이 간섭되는 경우를 미연에 방지할 수 있게 한다.In addition, the chamfering portion is formed in the groove formed in the heat insulation wall, thereby preventing the wrinkle of the sealing wall and the heat insulation wall from interfering.
도 1은 본 발명에 의한 액화천연가스 저장탱크의 일부를 개략적으로 도시한 것이다.1 schematically shows a part of a liquefied natural gas storage tank according to the present invention.
도 2는 본 발명에 의한 액화천연가스 저장탱크의 2차 밀봉벽을 도시한 것이다.Figure 2 shows the secondary sealing wall of the liquefied natural gas storage tank according to the present invention.
도 3은 도 2의 2차 밀봉벽의 일 부분을 확대한 것이다.FIG. 3 is an enlarged view of a portion of the secondary sealing wall of FIG. 2.
도 4는 본 발명에 의한 단열벽과 밀봉벽의 관계를 도시한 것이다.Figure 4 shows the relationship between the heat insulating wall and the sealing wall according to the present invention.
이하, 본 발명의 바람직한 실시 예를 첨부된 도면들을 참조하여 상세히 설명한다. 우선, 각 도면의 구성 요소들에 참조 부호를 부가함에 있어서, 동일한 구성 요소들에 대해서는 비록 다른 도면 상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.
먼저, 도 1을 참조하여 본 발명의 실시 예에 의한 액화천연가스 저장탱크를 설명한다. 도 1은 본 발명에 의한 액화천연가스 저장탱크의 일부를 개략적으로 도시한 것이다.First, a liquefied natural gas storage tank according to an embodiment of the present invention will be described with reference to FIG. 1. 1 schematically shows a part of a liquefied natural gas storage tank according to the present invention.
도 1에 도시된 바와 같이, 본 발명의 실시 예에 의한 액화천연가스 저장탱크는 1차 밀봉벽(110), 1차 단열벽(120), 2차 밀봉벽(200) 및 2차 단열벽(300)을 포함한다.As shown in FIG. 1, the LNG storage tank according to an embodiment of the present invention may include a primary sealing wall 110, a primary insulating wall 120, a secondary sealing wall 200, and a secondary insulating wall ( 300).
1차 밀봉벽(110)은 1차 단열벽(120) 위에 설치되어 액화천연가스와 접하면서 저장탱크에 저장된 액화천연가스(LNG)를 액밀한다.The primary sealing wall 110 is installed on the primary insulating wall 120 to contact the liquefied natural gas while the liquid liquefied natural gas (LNG) stored in the storage tank.
2차 밀봉벽(200)은 1차 단열벽(120)과 2차 단열벽(300) 사이에 설치되어 1차 밀봉벽(110)이 새는 경우 액화천연가스를 액밀하는 역할을 한다.The secondary sealing wall 200 is installed between the primary insulating wall 120 and the secondary insulating wall 300 serves to liquid-tighten the liquefied natural gas when the primary sealing wall 110 leaks.
1차 밀봉벽(110) 및 2차 밀봉벽(200)에는 온도 변화에 의한 수축 및 신장 시 파손 등을 방지하기 위해서 다수의 주름부가 형성된다. 주름부는 액화천연가스의 선하적에 따른 온도 변화에 의하여 신장되거나 수축되어 1차 밀봉벽(110) 및 2차 밀봉벽(200)에 가해지는 열적 변형에 따른 파손을 방지한다.A plurality of wrinkles are formed in the primary sealing wall 110 and the secondary sealing wall 200 in order to prevent breakage during shrinkage and extension due to temperature change. The wrinkled portion is stretched or shrunk by a temperature change according to the loading of the liquefied natural gas to prevent breakage due to thermal deformation applied to the primary sealing wall 110 and the secondary sealing wall 200.
1차 밀봉벽(110) 및 2차 밀봉벽(200)은 스테인레스 스틸로 제작될 수 있다.The primary sealing wall 110 and the secondary sealing wall 200 may be made of stainless steel.
도 2는 2차 밀봉벽(200)을 도시한 것이고, 도 3은 도 2에 나타낸 2차 밀봉벽(200)의 일부를 확대 도시한 것이다.FIG. 2 shows the secondary sealing wall 200, and FIG. 3 shows an enlarged view of a part of the secondary sealing wall 200 shown in FIG. 2.
2차 밀봉벽(200)에 형성되는 주름부(210)는 가로와 세로로 격자 형태로 다수 형성된다.A plurality of wrinkles 210 formed in the secondary sealing wall 200 are formed in a lattice form horizontally and vertically.
도 3과 같이 본 발명에서의 2차 밀봉벽(200)의 주름부(210)는 제1곡면(211)과 제2곡면(212)을 갖도록 성형된다.As shown in FIG. 3, the pleats 210 of the secondary sealing wall 200 in the present invention are molded to have a first curved surface 211 and a second curved surface 212.
즉, 주 곡면을 이루는 제2곡면(212)만으로 형성되고 모서리가 날카롭게 형성되는 것이 아니라, 주름의 시작점에서 제2곡면(212)과 반대 방향으로의 곡면 방향을 갖는 제1곡면(211)이 형성되도록 하여 열변형 대응을 위한 주름부로서의 기능에 보다 적절하도록 제작된다.That is, the first curved surface 211 having a curved direction in a direction opposite to the second curved surface 212 is formed not only with the second curved surface 212 constituting the main curved surface and the edge is sharply formed. It is manufactured so as to be more suitable for the function as a wrinkle part for thermal deformation response.
1차 밀봉벽(110)에 형성되는 주름은 액화천연가스 저장탱크의 내측면으로 형성되기 때문에, 다른 구성과의 간섭이 발생되지 않는다.Since the wrinkles formed on the primary sealing wall 110 are formed on the inner surface of the liquefied natural gas storage tank, interference with other components does not occur.
그러나, 2차 밀봉벽(200)은 상부에 1차 단일벽(120)과 접합되고, 하부에 2차 단열벽(300)과 접합되기 때문에 주름부(210)가 이들 단열벽과 간섭이 발생되게 된다.However, since the secondary sealing wall 200 is bonded to the primary single wall 120 at the upper portion and the secondary insulating wall 300 at the lower portion, the wrinkle portion 210 causes interference with these insulating walls. do.
그래서, 본 발명에 의한 액화천연가스 저장탱크의 단열벽에는 2차 밀봉벽(200)의 주름부(210)에 대응되는 홈이 형성된다.Thus, grooves corresponding to the pleats 210 of the secondary sealing wall 200 are formed in the insulating wall of the liquefied natural gas storage tank according to the present invention.
도 4는 이를 나타낸 형상이며, 2차 밀봉벽(200)의 주름부(210)가 2차 단열벽(300) 방향으로 형성되어, 2차 단열벽(300)에 홈이 형성된 것을 그 예로 들었다. 이에 국한되지 않고, 2차 밀봉벽(200)의 주름부(210)가 1차 단열벽(120) 방향으로 형성되고, 1차 단열벽(120)에 주름부(210)에 대응되는 홈이 형성될 수도 있다.4 is a shape showing this, for example, the wrinkle part 210 of the secondary sealing wall 200 is formed in the direction of the secondary heat insulating wall 300, the groove is formed in the secondary heat insulating wall 300. The present invention is not limited thereto, and the pleats 210 of the secondary sealing wall 200 are formed in the direction of the primary insulation wall 120, and grooves corresponding to the pleats 210 are formed in the primary insulation wall 120. May be
본 발명에서의 예로 드는 2차 단열벽(300)에 형성되는 홈은 그 홈의 크기를 최소화하여 단열 성능을 최대화하면서 2차 밀봉벽(200)과 간섭이 최대한 발생되지 않도록 형성된다.In the exemplary embodiment of the present invention, the grooves formed in the secondary insulation wall 300 are formed so as to minimize interference with the secondary sealing wall 200 while maximizing the insulation performance by minimizing the size of the grooves.
이를 위해서, 2차 단열벽(300)의 홈에는 면취부(311, 面取, chamfer)와 곡면부(312)가 형성된다.To this end, grooves 311 and chamfers and curved portions 312 are formed in the grooves of the secondary insulating wall 300.
면취부(311)는 2차 단열벽(300)에서 홈이 시작되는 지점에 해당하여, 이 지점이 경사지게 깎아지게 형성된 것이고, 곡면부(312)는 면취부(311)로부터 연장되어 2차 밀봉벽(200) 주름부(210)의 제2곡면(212)에 대응되는 곡률을 가지면서 제2곡면(212)의 외곽보다 2~3mm 가량 큰 반경을 가지도록 형성된다.Chamfering portion 311 corresponds to the point where the groove starts in the secondary heat insulating wall 300, this point is formed to be inclined beveled, the curved portion 312 is extended from the chamfering portion 311 to the secondary sealing wall The curvature 210 has a curvature corresponding to the second curved surface 212 and is formed to have a radius of about 2 to 3 mm larger than the outer edge of the second curved surface 212.
이와 같이 면취부(311)가 2차 밀봉벽(200) 주름부(210)의 제1곡면(211)과 대응되도록 형성됨으로써, 곡면부(312)가 2차 밀봉벽(200) 주름부(210)의 제2곡면(212)보다 최소한으로 큰 반경을 가질 수 있게 됨으로써, 공간 낭비를 최소화하고 단열 성능을 극대화할 수 있게 된다.As such, the chamfering portion 311 is formed to correspond to the first curved surface 211 of the wrinkled portion 210 of the secondary sealing wall 200, such that the curved portion 312 is the wrinkled portion 210 of the secondary sealing wall 200. By being able to have a radius larger than the second curved surface 212 of the minimum, it is possible to minimize space waste and maximize the thermal insulation performance.
또한, 홈의 시작 지점이 급격히 꺾어지지 않고, 면취부(311)가 형성되어 완만한 경사로 형성됨으로써, 만일의 경우에 발생할 수 있는 2차 밀봉벽(200)과 홈 모서리가 접촉되어 발생되는 불량을 방지시킬 수 있다.In addition, the starting point of the groove is not sharply bent, the chamfering portion 311 is formed to form a gentle inclination, the defect caused by contact with the secondary sealing wall 200 and the edge of the groove that may occur in the event of emergency Can be prevented.
한편, 1차 단열벽(120)은 1차 밀봉벽(110) 아래에 위치하면서 액화천연가스를 단열시키고, 2차 단열벽(300)은 액화천연가스 저장 탱크의 내부 벽에 설치되어 액화천연가스를 단열시킨다. 즉, 2차 단열벽(300)이 액화천연가스 저장 탱크의 내부 벽에 설치되고, 2차 단열벽(300)의 상부에 2차 밀봉벽(200)이 위치한다.On the other hand, the primary insulating wall 120 is located below the primary sealing wall 110 to insulate the liquefied natural gas, the secondary insulating wall 300 is installed on the inner wall of the liquefied natural gas storage tank is liquefied natural gas Insulate That is, the secondary insulation wall 300 is installed on the inner wall of the liquefied natural gas storage tank, and the secondary sealing wall 200 is positioned on the secondary insulation wall 300.
1차 단열벽(120) 및 2차 단열벽(300)은 상부판, 하부판 및 상부판과 하부판 사이에 형성되는 단열재로 이루어진다. 상부판과 하부판은 플라이우드(Plywood) 재질로 이루어지고, 단열재는 폴리우레탄 폼(Polyurethane Form)으로 형성될 수 있다.The primary heat insulation wall 120 and the secondary heat insulation wall 300 are formed of a top plate, a bottom plate, and a heat insulating material formed between the top plate and the bottom plate. The upper plate and the lower plate is made of a plywood (Plywood) material, the insulation may be formed of polyurethane foam (Polyurethane Form).
본 발명의 2차 단열벽(300)에 형성되는 홈은 상부판과 일부의 단열재를 제거한 형태일 수 있다.The groove formed in the secondary heat insulation wall 300 of the present invention may have a shape in which the top plate and a part of the heat insulating material are removed.
이상과 같이 본 발명에 따른 액화천연가스 저장탱크 및 액화천연가스 저장탱크의 단열벽은, 예시된 도면을 참조하여 설명하였으나, 본 발명은 이상에서 설명된 실시 예와 도면에 의해 한정되지 않으며, 특허청구범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자들에 의해 다양한 수정 및 변형이 이루어질 수 있음은 물론이다.As described above, the insulating wall of the liquefied natural gas storage tank and the liquefied natural gas storage tank according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and the patent Of course, various modifications and variations can be made by those skilled in the art within the scope of the claims.
* 부호의 설명** Explanation of Codes *
110 : 1차 밀봉벽110: primary sealing wall
120 : 1차 단열벽120: primary insulation wall
200 : 2차 밀봉벽200: secondary sealing wall
210 : 주름부210: wrinkles
211 : 제1곡면 212 : 제2곡면211: first surface 212: second surface
300 : 2차 단열벽300: secondary insulation wall
311 : 면취부 312 : 곡면부311: chamfered part 312: curved part

Claims (8)

  1. 내부 공간에 저장되는 액화천연가스를 밀봉시키기 위해 스테인리스 스틸 소재로 마련되는 밀봉벽;A sealing wall made of stainless steel to seal the liquefied natural gas stored in the internal space;
    상기 밀봉벽과 접합되며, 상기 내부 공간을 외부와 단열시키기 위해 마련되는 단열벽을 포함하고,A heat insulation wall bonded to the sealing wall and provided to insulate the internal space from the outside;
    상기 밀봉벽에는 열적 변형에 대응하기 위한 주름부가 형성되고,The sealing wall is formed with a corrugation portion to correspond to the thermal deformation,
    상기 단열벽에는 상기 주름부가 삽입될 수 있도록 상기 주름부와 대응되게 홈이 형성된 것을 특징으로 하는,The heat insulating wall is characterized in that the groove is formed to correspond to the wrinkle portion so that the wrinkle portion can be inserted,
    액화천연가스 저장탱크.LNG storage tanks.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 단열벽은 상기 밀봉벽의 상부와 하부에 이중으로 형성되며,The heat insulation wall is formed in a double upper and lower portion of the sealing wall,
    상기 밀봉벽의 상부에 형성되는 단열벽의 상부에는 내부 공간에 저장되는 액화천연가스를 1차적으로 밀봉시키기 위한 1차 밀봉벽이 형성된 것을 특징으로 하는,Characterized in that the primary sealing wall is formed on the upper portion of the heat insulating wall formed on the upper portion of the sealing wall for primarily sealing the liquefied natural gas stored in the internal space,
    액화천연가스 저장탱크.LNG storage tanks.
  3. 청구항 2에 있어서,The method according to claim 2,
    상기 1차 밀봉벽에는 열적 변형에 대응하기 위한 주름부가 형성된 것을 특징으로 하는,The primary sealing wall is characterized in that the wrinkles formed to correspond to the thermal deformation,
    액화천연가스 저장탱크.LNG storage tanks.
  4. 청구항 3에 있어서,The method according to claim 3,
    상기 단열벽에 상기 주름부가 삽입될 수 있도록 형성되는 홈은 모서리를 깎아서 형성시킨 면취부와, 주 곡면을 이루는 곡면부로 형성된 것을 특징으로 하는,The groove is formed so that the wrinkle portion can be inserted into the heat insulating wall is characterized in that formed in the chamfer formed by cutting the corners, the curved portion constituting the main curved surface,
    액화천연가스 저장탱크.LNG storage tanks.
  5. 청구항 4에 있어서,The method according to claim 4,
    상기 곡면부는 상기 주름부가 형성하는 곡률과 동일한 곡률로 형성되는 것을 특징으로 하는,The curved surface portion is characterized in that the curvature formed with the same curvature formed,
    액화천연가스 저장탱크.LNG storage tanks.
  6. 액화천연가스 저장탱크의 내부 공간을 외부와 단열시키기 위해 마련되며,It is provided to insulate the internal space of the LNG storage tank from the outside,
    스테인리스 스틸 소재로 마련되고 열적 변형에 대응하기 위한 주름부가 형성된 밀봉벽과 접합되고, It is made of stainless steel material and joined with sealing wall formed with corrugation part to cope with thermal deformation,
    상기 주름부가 삽입될 수 있도록 상기 주름부와 대응되게 홈이 형성된 것을 특징으로 하는,Characterized in that the groove is formed corresponding to the wrinkle portion so that the wrinkle portion can be inserted,
    액화천연가스 저장탱크의 단열벽.Insulation wall of LNG storage tank.
  7. 청구항 6에 있어서,The method according to claim 6,
    상기 주름부와 대응되게 형성되는 홈은 모서리를 깎아서 형성시킨 면취부와, 주 곡면을 이루는 곡면부로 형성된 것을 특징으로 하는,The groove is formed to correspond to the wrinkle portion is characterized in that formed by the chamfered portion formed by shaving the corner, the curved portion constituting the main curved surface,
    액화천연가스 저장탱크의 단열벽.Insulation wall of LNG storage tank.
  8. 청구항 7에 있어서,The method according to claim 7,
    상기 곡면부는 상기 주름부가 형성하는 곡률과 동일한 곡률로 형성되는 것을 특징으로 하는,The curved surface portion is characterized in that the curvature formed with the same curvature formed,
    액화천연가스 저장탱크의 단열벽.Insulation wall of LNG storage tank.
PCT/KR2016/001164 2015-07-22 2016-02-03 Liquefied natural gas storage tank, and insulating wall of liquefied natural gas storage tank WO2017014389A1 (en)

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KR1020150103481A KR20170011226A (en) 2015-07-22 2015-07-22 Liquid natural gas storage tank and insulation wall

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