KR101086766B1 - Insulation structure of lng cargo - Google Patents

Insulation structure of lng cargo Download PDF

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KR101086766B1
KR101086766B1 KR1020080118917A KR20080118917A KR101086766B1 KR 101086766 B1 KR101086766 B1 KR 101086766B1 KR 1020080118917 A KR1020080118917 A KR 1020080118917A KR 20080118917 A KR20080118917 A KR 20080118917A KR 101086766 B1 KR101086766 B1 KR 101086766B1
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membrane
cargo hold
flat
lng
wrinkles
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KR1020080118917A
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Korean (ko)
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KR20100060348A (en
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전상언
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삼성중공업 주식회사
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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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • 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
    • 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
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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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

본 발명은 액화천연가스 화물창의 단열구조에 관한 것으로서, 액화천연가스 화물창을 구성하는 1차 방벽의 멤브레인에 평탄부와 높이차가 나도록 단차부를 두고 형성되는 주름부와, 주름부의 내측으로 단차부에 부착 설치되는 보강주름부를 포함한다. 따라서 본 발명에 의하면 주름부의 내측으로 보강주름부를 설치한 2중 구조로 하여 열하중이나 충격하중에 강하며, 단열층이 부가적으로 형성되어 단열 효율이 증가되는 효과를 가진다.

Figure R1020080118917

액화천연가스 화물창, 멤브레인, 주름부, 단열

The present invention relates to a heat insulating structure of a LNG cargo hold, wherein the membrane is formed on the membrane of the primary barrier constituting the LNG cargo hold with a stepped portion so as to have a height difference with the flat portion, and is attached to the stepped portion inside the wrinkled portion. It includes a reinforcing wrinkle portion that is installed. Therefore, according to the present invention has a double structure provided with a reinforcing wrinkles inside the pleated portion is resistant to thermal loads or impact loads, the heat insulating layer is additionally formed has the effect of increasing the heat insulation efficiency.

Figure R1020080118917

LNG Cargo, Membrane, Crease, Insulation

Description

액화천연가스 화물창의 단열구조{INSULATION STRUCTURE OF LNG CARGO} INSULATION STRUCTURE OF LNG CARGO

본 발명은 액화천연가스 화물창의 단열구조에 관한 것으로, 더욱 상세하게는 1차 방벽을 구성하는 금속 멤브레인의 주름부를 구조적으로 보강하고, 단열 효과도 높일 수 있는 액화천연가스 화물창의 단열구조에 관한 것이다.The present invention relates to a heat insulating structure of a LNG cargo hold, and more particularly, to a heat insulating structure of a LNG cargo hold which can structurally reinforce the pleats of the metal membrane constituting the primary barrier and also enhance the heat insulating effect. .

일반적으로, 액화천연가스(LNG)는 메탄(methane)을 주성분으로 하는 천연가스를 섭씨 ­163℃로 냉각해 그 부피를 6백분의 1로 줄인 무색 투명한 초저온 액체를 말한다.In general, liquefied natural gas (LNG) refers to a colorless transparent cryogenic liquid whose natural gas, which contains methane as its main component, is cooled to ­163 ° C and its volume is reduced to one hundredth.

이러한 액화천연가스가 에너지자원으로 등장함에 따라 이 가스를 에너지로 이용하기 위해서 생산기지로부터 수요지의 인수지까지 대량으로 수송할 수 있는 효율적인 운송방안이 검토되어 왔으며, 이러한 노력의 일환으로 대량의 액화천연가스를 해상으로 수송할 수 있는 액화천연가스 운반선이 나타나게 되었다.As such liquefied natural gas has emerged as an energy resource, an efficient transportation method that can transport a large amount from the production base to the receiving site of the demand in order to use this gas as energy has been considered. LNG carriers have emerged to transport gas offshore.

그런데 이러한 액화천연가스 운반선에는 초저온상태로 액화시킨 액화천연가스를 보관 및 저장할 수 있는 화물창(Cargo)이 구비되어 있어야 하는데, 이러한 화물창에 요구되는 조건이 매우 까다로워 많은 어려움이 있었다. 즉, 액화천연가스는 대기압 보다 높은 증기압을 가지며, 대략 섭씨 ­163℃ 정도의 비등온도를 갖기 때문에, 이러한 액화천연가스를 안전하게 보관하고 저장하기 위해서는 이를 저장하는 화물창은 초저온에 견딜 수 있는 재료, 예를 들면 알루미늄강, 스테인리스강, 35% 니켈강 등으로 제작되어야 하며, 기타 열응력 및 열수축에 강하고, 열침입을 막을 수 있는 독특한 인슐레이션 구조로 설계되어야 했다. By the way, the LNG carrier should be provided with a cargo hold (Cargo) to store and store the liquefied natural gas liquefied in the cryogenic state, there were a lot of difficulties because the requirements for such cargo hold is very demanding. In other words, the liquefied natural gas has a vapor pressure higher than atmospheric pressure, and has a boiling temperature of about 163 degrees Celsius, so that the cargo hold for storing the liquefied natural gas in order to safely store and store the liquefied natural gas, such as materials that can withstand ultra low temperatures, for example For example, it must be made of aluminum steel, stainless steel, 35% nickel steel, etc., and must be designed with a unique insulation structure that is resistant to other thermal stresses and heat shrinkage and prevents heat intrusion.

특히, 화물창의 1차 방벽인 금속 멤브레인은 ­163℃의 극저온 상태의 LNG와 직접적으로 접촉하게 되므로 응력변화에 대응할 수 있는 알루미늄 합금, 인바(Invar), 9% 니켈강 등 저온 취성에 강한 재질의 금속재질이 사용되며, 반복적인 온도변화 및 저장액체의 하중변화에 의한 팽창 및 수축이 용이하도록 중앙부가 융기된 직선 주름부(코러게이션)를 구비하고 있으며, 다수의 멤브레인 금속패널 모서리가 겹치기 용접에 의해 서로 용접 연결되어 탱크의 기밀성을 유지하도록 용접부를 구비한다. In particular, the metal membrane, which is the primary barrier of cargo holds, is in direct contact with LNG in cryogenic conditions at 163 ° C. Therefore, it is a metal material of low temperature brittleness such as aluminum alloy, Invar, 9% nickel steel, which can cope with stress changes. It is used, and has a central corrugated straight line (corrugation) to facilitate expansion and contraction due to repeated temperature changes and load changes of the storage liquid, and a plurality of membrane metal panel edges are overlapped with each other by overlap welding. A welded connection is provided to maintain the airtightness of the tank.

종래에 사용되고 있는 금속 멤브레인은 대략 직사각형으로 제작되고, 열과 하중의 변화에 의한 팽창 및 수축이 용이하도록 다수개의 주름부가 금속패널 전체에 걸쳐 형성되어 있으며, 다수개의 주름부를 구비하는 단일 멤브레인 금속패널의 모서리 및 4 변이 이웃하는 또 다른 단일 멤브레인 금속패널의 모서리 및 4변에 의해 겹쳐진 후 겹치기 용접에 의해 서로 연결되어 탱크의 기밀성을 유지하도록 되어 있다.Conventionally used metal membranes are manufactured in a substantially rectangular shape, and a plurality of corrugations are formed throughout the metal panel to facilitate expansion and contraction due to changes in heat and load, and a corner of a single membrane metal panel having a plurality of corrugations. And four sides overlapped by the edges and four sides of another neighboring single membrane metal panel and then connected to each other by overlap welding to maintain the airtightness of the tank.

그러나 이와 같은 종래의 금속 멤브레인의 융기된 주름부가 LNG선의 대형화 추세에 따른 화물창내 슬로싱 하중하에서 쉽게 변형 혹은 붕괴되는 현상이 예상되 고 있다. 예컨대 액화천연가스에 의해 가해지는 유체의 동적 하중(충격하중)이 주름부에 상당한 소성 변형을 일으킬 수 있으며 특히 교차하는 주름부로부터 소정의 거리에 있는 주름부의 측면이 좌굴 혹은 한 쪽으로 심하게 기울어져 비대칭 주름부가 형성되어 열하중에 대한 주름부의 기계적 특성이 변할 수 있다. However, it is expected that the raised corrugated portion of the conventional metal membrane is easily deformed or collapsed under the sloshing load in the cargo hold according to the trend of larger LNG carriers. For example, the dynamic loads (impact loads) of fluids applied by liquefied natural gas can cause significant plastic deformation in the corrugations, especially when the sides of the corrugations at a distance from the intersecting corrugations are buckled or skewed to one side and are asymmetric. The wrinkles may be formed so that the mechanical properties of the wrinkles with respect to the heat load may change.

이에 주름부의 강성 보강을 위한 해결책으로 멤브레인의 두께를 증가시키는 등의 많은 방법이 시행되었으나 가요성이 저하되는 등의 문제점이 있다. 더욱이 미국특허 US2005/0082297호에 따르면 도 1 또는 도 2에 도시된 것과 같이 하나 이상의 멤브레인(10)을 포함하는 밀봉 벽 구조물이 개시되어 있으며, 멤브레인은 직교하는 방향의 하나 이상의 제 1 주름부(5) 및 제 2 주름부(6)가 형성되고, 이 주름부(5)(6)는 탱크의 내부면을 향하여 돌출되며, 밀봉 벽 구조물은 다른 주름 열과의 두 개의 연속 교차부(8) 사이의 부분에 하나 이상의 주름부에 형성된 하나 이상의 강화 릿지(Ridge:11)를 포함하며, 각각의 릿지(11)는 대체로 볼록하며 릿지를 지지하는 주름부의 하나 이상의 측면에 국부적으로 형성되는 구성이다. As a solution for stiffness reinforcement of the pleats, many methods such as increasing the thickness of the membrane have been implemented, but there are problems such as reduced flexibility. Furthermore, according to US 2005/0082297 a sealing wall structure is disclosed which comprises at least one membrane 10 as shown in FIG. 1 or 2, wherein the membrane has at least one first corrugation 5 in an orthogonal direction. ) And a second pleat 6, which protrudes towards the inner surface of the tank, and the sealing wall structure is formed between two successive intersections 8 with other rows of pleat. A portion includes one or more reinforcing ridges (11) formed in one or more pleats, each ridge 11 being generally convex and locally formed on one or more sides of the pleats supporting the ridges.

그러나, 위와 같은 종래 기술에 따르면, 주름부의 릿지 구조가 주름부 대칭면을 기준으로 대칭의 하중조건을 가지는 하중 조건에 대해서는 주름부의 변형 혹은 좌굴에 의한 붕괴를 막아주는 역할을 하지만, 릿지로 인하여 면강성이 증가된 주름부는 본연의 팽창 및 수축력이 저하되어 열수축시 용접부에 응력을 증가시키는 단점이 발견되었다. 더욱이 보강이 필요없는 부위에는 릿지가 구비되지 않은 멤브 레인을 사용하고, 보강이 필요한 부위에는 릿지를 구비한 멤브레인을 별도로 준비해야 하는 불편함이 있었다. 또한 최근에 확인되는 현상으로써, 하중이 주름부의 대칭면을 기준으로 도 2의 화살표와 같이 비대칭으로 측면에서 작용할 때 주름부의 릿지가 일부 역할은 하지만 대칭하중에서의 보강역할이 상당히 감소되는 것이 확인되었다.However, according to the prior art as described above, the ridge structure of the crease portion serves to prevent the collapse or deformation of the crease portion due to the ridge for load conditions having a symmetrical load condition based on the symmetry plane of the crease portion. This increased crease has been found to reduce the natural expansion and contraction force, which increases the stress in the weld during heat shrinkage. In addition, there is an inconvenience in that a membrane having no ridge is used for a portion that does not need reinforcement, and a membrane having a ridge is separately prepared for the portion requiring reinforcement. In addition, as a phenomenon recently confirmed, when the load acts on the side asymmetrically as shown by the arrow of Fig. 2 with respect to the symmetry plane of the wrinkle portion, the ridge portion of the wrinkle portion, but it was confirmed that the reinforcement role in the symmetrical load is significantly reduced.

따라서 본 발명에서는 주름부가 2중 구조를 가지도록 주름부의 내측으로 보강주름부를 설치함으로써, 열하중에서는 주름부와 보강주름부가 별도로 설치되어 있기 때문에 서로의 간섭 없이 수축될 수 있고, 슬로싱과 같은 충격 하중시에는 2중 구조에 의해 변형이 최소화될 수 있으며, 더욱이 충격하중이 주름부의 측면에 비대칭으로 작용하더라도 주름부의 하부가 2중 구조로 보강되어 변형이 방지될 수 있는 액화천연가스 화물창의 단열구조를 제공하는 것을 그 목적으로 한다.Therefore, in the present invention, by installing the reinforcement wrinkle portion inside the wrinkle portion so that the wrinkle portion has a double structure, since the wrinkle portion and the reinforcement wrinkle portion is installed separately in the heat load, it can be shrunk without interference with each other, impact such as sloshing During loading, the deformation can be minimized by the double structure, and even though the impact load acts asymmetrically on the side of the corrugated portion, the lower portion of the corrugated portion is reinforced with a double structure so that the deformation of the LNG cargo hold can be prevented. To provide that purpose.

상기 목적을 달성하기 위하여 본 발명은, 액화천연가스 화물창의 단열구조에 있어서, 액화천연가스 화물창을 구성하는 1차 방벽의 멤브레인에 평탄부와 높이차가 나도록 단차부를 두고 형성되는 주름부와, 주름부의 내측으로 단차부에 부착 설치되는 보강주름부를 포함하는 액화천연가스 화물창의 단열구조를 제공한다.In order to achieve the above object, the present invention, in the thermal insulation structure of the LNG cargo hold, wrinkles formed on the membrane of the primary barrier constituting the LNG cargo hold with a stepped portion so as to have a difference between the flat portion and the wrinkle portion, It provides a thermal insulation structure of the LNG cargo hold including a reinforcing wrinkle portion is attached to the stepped portion inwardly.

그리고 보강주름부는 편평한 평탄면과, 평탄면으로부터 융기된 융기면으로 구성되며, 융기면의 단면이 반원 또는 다각형상을 가진다.The reinforcing wrinkles portion is composed of a flat flat surface and a raised surface raised from the flat surface, and the cross section of the raised surface has a semicircle or polygonal shape.

또한, 주름부와 보강주름부의 사이 공간에는 주름부의 내측면을 따라 완충용 박막부재와 탄성을 가지는 충진부재가 설치된다.In addition, a space between the wrinkle portion and the reinforcement wrinkle portion is provided with a cushioning thin film member and a filling member having elasticity along the inner surface of the wrinkle portion.

다른 일예로서, 주름부의 내측면을 따라 완충용 박막부재가 부착 설치되고, 편평한 평탄면이 상기 단차부에 부착되며 상기 평탄면으로부터 융기된 융기면은 상기 박막부재에 밀착되도록 보강주름부가 설치될 수도 있다.As another example, a cushioning thin film member may be attached to the inner surface of the corrugation part, and a flat flat surface may be attached to the stepped portion, and a reinforcing wrinkle part may be installed to closely contact the thin film member. have.

이상 설명한 바와 같이 본 발명의 액화천연가스 화물창의 단열구조에 따르면, 주름부의 내측으로 보강주름부를 설치한 2중 구조로 하여 열하중이나 충격하중에 강하며, 단열층이 부가적으로 형성되어 단열 효율이 증가되는 효과를 가진다.As described above, according to the heat insulation structure of the LNG natural cargo hold of the present invention, the double structure provided with a reinforcing wrinkle portion inside the corrugation portion is resistant to heat load or impact load, and the heat insulation layer is additionally formed to increase the heat insulation efficiency. Has the effect of becoming.

이하 첨부된 도면을 참조하여 본 발명의 동작 원리를 상세히 설명한다. 하기에서 본 발명을 설명함에 있어서 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 그리고 후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례 등에 따라 달라질 수 있다. 그러므로 그 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다. Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

도 3은 본 발명의 제 1 실시예에 따른 액화천연가스 화물창의 단열구조의 단면도이고, 도 4는 본 발명의 제 1 실시예에 따른 액화천연가스 화물창의 단열구조의 일부 발췌 사시도이고, 도 5는 본 발명의 제 2 실시예에 따른 액화천연가스 화물창의 단열구조의 단면도이고, 도 6은 본 발명의 제 2 실시예에 따른 액화천연가스 화물창의 단열구조의 일부 발췌 사시도이다.3 is a cross-sectional view of the insulating structure of the LNG cargo hold according to the first embodiment of the present invention, Figure 4 is a perspective view of a part of the insulating structure of the LNG cargo hold according to the first embodiment of the present invention, Figure 5 6 is a cross-sectional view of an insulating structure of the LNG cargo hold according to the second embodiment of the present invention, Figure 6 is a perspective view of a part of the insulating structure of the LNG cargo hold according to a second embodiment of the present invention.

액화천연가스 화물창에서 1차 방벽을 구성하는 멤브레인(100)은, 사각의 판상 형태로 -163℃의 극저온 상태의 액화천연가스와 직접적으로 접촉하게 되므로 응력변화에 대응할 수 있는 알루미늄 합금, 인바(Invar), 9% 니켈강 등 저온 취성에 강한 재질의 금속재질이 사용되며, 직교하는 방향으로 주름부(110)가 형성되며, 이 주름부(110 )는 화물창(미도시)의 내부면을 향하여 돌출된다.Membrane 100 constituting the primary barrier in the LNG carrier is in the form of a square plate, which is in direct contact with the LNG in a cryogenic state of -163 ° C. ), 9% nickel steel, such as a metal material of low temperature brittleness is used, wrinkles 110 are formed in a direction perpendicular to the wrinkles 110, the wrinkles 110 are projected toward the inner surface of the cargo hold (not shown). .

여기서 예시된 도 3 내지 도 4의 제 1 실시예에 따르면, 멤브레인(100)의 주름부(110)는 온도변화 및 저장액체의 하중변화에 팽창 및 수축이 용이하도록 중앙부가 융기 형성되고, 하면측은 판상의 평탄부(102)와 상방측으로 높이차가 나도록 단차부(104)를 두고 형성된다. 단차부(104)는 판상의 두께 정도로 완만하게 형성되는 것이 바람직하며, 멤브레인(100)의 금형 제작시 주름부(110)가 단차를 가지도록 돌출 형성된다.According to the first embodiment of FIGS. 3 to 4 illustrated here, the pleated portion 110 of the membrane 100 has a central portion raised to facilitate expansion and contraction due to temperature change and load change of the storage liquid, It is formed with the step part 104 so that a height difference may be made upward from a plate-shaped flat part 102. As shown in FIG. Preferably, the stepped part 104 is formed to have a smooth plate-like thickness, and is formed to protrude so that the wrinkle part 110 has a step when the mold of the membrane 100 is manufactured.

이러한 주름부(110)의 내측으로 보강주름부(120)가 부착 설치된다. The reinforcing wrinkles part 120 is attached to the inside of the wrinkle part 110.

보강주름부(120)는 평편한 평탄면(120a)과 평탄면(120a)으로부터 길이 방향으로 융기된 융기면(120b)으로 이루어지며, 융기면(120b)의 단면 형상은 반원 또는 다각형상을 가질 수 있다. 전체적으로 주름부(110) 보다는 작은 크기를 가지고, 멤브레인(100) 재질과 동일한 것이 바람직하다.The reinforcing wrinkles 120 is composed of a flat flat surface 120a and a raised surface 120b raised in the longitudinal direction from the flat surface 120a, and the cross-sectional shape of the raised surface 120b may have a semicircle or polygonal shape. Can be. It is preferable to have a smaller size than the wrinkle part 110 as a whole and the same material as the material of the membrane 100.

이러한 보강주름부(120)는 멤브레인(100)을 뒤집은 상태에서 필름 형태의 접착부재(130)를 평탄면(120a)에 부착하여 주름부(110)의 하부 단차부(104)에 부착 설치하게 된다.The reinforcing wrinkles 120 is attached to the lower stepped portion 104 of the wrinkles 110 by attaching the adhesive member 130 of the film form on the flat surface (120a) in the state inverted the membrane (100). .

위와 같이 주름부(110)와 보강주름부(120)의 2중 구조에 있어 주름부(110)와 보강주름부(120)의 공간 사이에 충진부재(140)가 주입 설치될 수 있다.In the double structure of the wrinkles 110 and the reinforcement wrinkles 120 as described above, the filling member 140 may be injected between the space of the wrinkles 110 and the reinforcement wrinkles 120.

충진부재(140)는 탄성중합체(elastomer)가 바람직하고, 주름부(110)와 보강주름부(120)의 개구 공간 일측에서부터 밀어 넣어 채워넣게 된다. Filling member 140 is preferably an elastomer (elastomer), and is pushed and filled from one side of the opening space of the wrinkles 110 and the reinforcing wrinkles (120).

더 나아가 주름부(110)의 내측면과 충진부재(140)의 사이에는 충격 하중시 완충 역할을 할 수 있는 박막부재(150)가 설치될 수 있으며, 박막부재(150)는 양면 접착 테이프와 같으며, 쿠션이 있는 폼부재로 하여 얇게 부착 설치된다. 따라서 박막부재(150)의 설치시에는 충진부재(140)와 보강주름부(120)의 설치 이전에 멤브레인(100)을 뒤집은 상태에서 주름부(110)의 내측면에 먼저 박막부재(150)가 부착 설치되고, 보강주름부(120)의 설치 후 박막부재(150)의 내측으로 충진부재(140)가 주입 설치된다.Furthermore, between the inner surface of the wrinkle portion 110 and the filling member 140 may be installed a thin film member 150 that can act as a buffer during the impact load, the thin film member 150 is the same as a double-sided adhesive tape It is a thin foamed foam member. Therefore, when the thin film member 150 is installed, the thin film member 150 is first formed on the inner surface of the wrinkle part 110 while the membrane 100 is inverted before the filling member 140 and the reinforcing wrinkle part 120 are installed. Attached and installed, the filling member 140 is injected into the thin film member 150 after installation of the reinforcing wrinkles 120 is installed.

그리고 도 5 내지 도 6의 제 2 실시예에 따르면, 멤브레인(100)의 주름부(110)는 판상의 평탄부(102)와 상방측으로 높이차가 나도록 단차부(104)를 두고 형성되며, 이 단차부(104)는 판상의 두께 정도로 완만하게 형성되는 것이 바람직하고, 멤브레인(100)의 금형 제작시 주름부(110)가 단차를 가지도록 형성된다.In addition, according to the second embodiment of FIGS. 5 to 6, the pleats 110 of the membrane 100 are formed with the stepped part 104 so as to have a height difference upwardly with the plate-shaped flat part 102. The part 104 is preferably formed to have a smooth plate-like thickness, and is formed so that the wrinkle part 110 has a step when the mold of the membrane 100 is manufactured.

이러한 주름부(110)의 내측으로 충격 하중시 완충 역할을 할 수 있는 박막부재(150)가 설치되며, 박막부재(150)는 양면 접착 테이프와 같으며, 쿠션이 있는 폼부재로 하여 얇게 부착 설치된다. The thin film member 150 which can play a buffer role in the impact load to the inside of the wrinkle portion 110 is installed, the thin film member 150 is the same as the double-sided adhesive tape, it is installed as a thin foam cushion member do.

그리고 이 박막부재(150)의 내측면에 밀착되도록 보강주름부(122)가 부착 설치된다. The reinforcing wrinkles 122 are attached to the inner surface of the thin film member 150.

보강주름부(122)는 멤브레인(100)과 동일 재질로 이루어지며, 평편한 평탄 면(122a)과 평탄면(122a)으로부터 길이 방향으로 융기된 융기면(122b)으로 이루어지며, 이 융기면(122b)이 박막부재(150)에 밀착 설치된다. The reinforcing wrinkles 122 is made of the same material as the membrane 100, and is made of a flat flat surface 122a and a raised surface 122b raised in the longitudinal direction from the flat surface 122a. 122b) is installed in close contact with the thin film member 150.

또한, 보강주름부(122)의 평탄면(122a) 양단으로는 필름 형태의 접착부재(130)를 부착시켜서 주름부(110)의 단차부(104)에 보강 주름부(122)를 안정적으로 부착 설치될 수 있다.In addition, the reinforcing wrinkles 122 are stably attached to the stepped portion 104 of the wrinkles 110 by attaching the adhesive member 130 in the form of a film to both ends of the flat surface 122a of the reinforcement wrinkles 122. Can be installed.

이와 같은 구조로 이루어진 액화천연가스 화물창의 멤브레인 구조에 따른 작용을 설명하면 다음과 같이 이루어진다.Referring to the operation of the membrane structure of the LNG cargo hold made of such a structure is made as follows.

멤브레인(100)에 단차부(104)를 두고 일체로 형성되는 주름부(110)와, 이 주름부(110)의 내측으로 보강주름부(120)(122)가 설치되는 2중 구조의 1차 방벽 단열구조에 따르면, 제 1 실시예에서의 주름부(110)와 보강주름부(120)는 물론, 제 2 실시예의 주름부(110)와 보강주름부(122)도 박막부재(150)를 매개로 부착되어 있지만, 서로 일체 상태가 아니기 때문에 온도 변화에 따라 수축 및 팽창시 주름부(110)와 보강주름부(120)(122)가 서로 간섭 없이 수축 및 팽창되어 열하중에 견딜 수 있다.Primary having a double structure in which the pleated portion 110 is formed integrally with the stepped portion 104 on the membrane 100, and the reinforcement folds 120 and 122 are provided inside the pleated portion 110. According to the barrier insulating structure, the wrinkle part 110 and the reinforcement wrinkle part 120 of the first embodiment, as well as the wrinkle part 110 and the reinforcement wrinkle part 122 of the second embodiment, may also have the thin film member 150. Although attached to each other, because they are not integral with each other, the wrinkles 110 and the reinforcement wrinkles 120 and 122 may contract and expand without interfering with each other during thermal contraction and expansion according to temperature changes, and thus may withstand thermal loads.

그리고 슬로싱과 같은 충격 하중시에도 주름부(110)와 보강주름부(120)(122)의 이중 구조로 하여 주름부(110)의 변형을 최소화할 수 있으며, 더욱이 충진부재(140)가 설치된 제 1 실시예의 멤브레인(100)에서는 충격 하중에 강할 뿐만 아니라 단열 효과를 증대시킬 수 있다.In addition, even when impact load such as sloshing has a double structure of the wrinkle part 110 and the reinforcement wrinkle part 120 and 122, the deformation of the wrinkle part 110 can be minimized, and the filling member 140 is further installed. In the membrane 100 of the first embodiment, it is not only resistant to impact loads but also can increase adiabatic effect.

또한, 주름부(110)의 단차부(104)에 부착 위치되는 보강주름부(120)(122)의 평탄면(120a)(122a)로 하여 주름부(110)의 하부가 보강되어 충격하중이 측면에 비 대칭으로 작용하더라도 충분히 견뎌낼 수 있다.In addition, the lower portion of the wrinkles 110 is reinforced by the flat surfaces 120a and 122a of the reinforcement wrinkles 120 and 122 that are attached to the stepped portion 104 of the wrinkles 110, so that the impact load is increased. Asymmetrically acting on the sides, even enough to withstand.

또, 주름부(110)와 보강주름부(120)(122)의 이중 구조는 보강주름부(120)(122)의 내측 공간이 충분히 확보되어 멤브레인(100)에 N2가스의 충진을 위한 파이프(미도시)의 설치가 용이해짐은 물론, N2가스의 충진에도 연속 공간의 확보로 원활한 흐름에 유리할 수 있다.In addition, the double structure of the pleats 110 and the reinforcement wrinkles 120 and 122 has a sufficient inner space of the reinforcement wrinkles 120 and 122 to allow the membrane 100 to fill the N 2 gas ( Not shown) may be easy to install, as well as ensuring a continuous space in the filling of N2 gas may be advantageous for a smooth flow.

이상에서 설명한 것은 본 발명에 따른 액화천연가스 화물창의 단열구조에 대하여 하나의 바람직한 실시예에 불과한 것으로서, 본 발명은 상기한 실시예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.What has been described above is just one preferred embodiment of the insulating structure of the LNG cargo hold according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made.

도 1은 일반적인 금속 멤브레인의 사시도이고,1 is a perspective view of a typical metal membrane,

도 2는 종래 기술에 따른 금속 멤브레인의 일부 확대 사시도이고,2 is a partially enlarged perspective view of a metal membrane according to the prior art,

도 3은 본 발명의 제 1 실시예에 따른 액화천연가스 화물창의 단열구조의 단면도이고,3 is a cross-sectional view of the insulating structure of the LNG cargo hold according to the first embodiment of the present invention,

도 4는 본 발명의 제 1 실시예에 따른 액화천연가스 화물창의 단열구조의 일부 발췌 사시도이고,Figure 4 is a perspective view of a part of the insulating structure of the LNG cargo hold according to the first embodiment of the present invention,

도 5는 본 발명의 제 2 실시예에 따른 액화천연가스 화물창의 단열구조의 단면도이고,5 is a cross-sectional view of the thermal insulation structure of the LNG cargo hold according to the second embodiment of the present invention,

도 6은 본 발명의 제 2 실시예에 따른 액화천연가스 화물창의 단열구조의 일부 발췌 사시도이다.Figure 6 is a perspective view of a part of the insulating structure of the LNG cargo hold according to a second embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

100 : 멤브레인 102 : 평탄부100: membrane 102: flat part

104 : 단차부 110 : 주름부104: step portion 110: wrinkle portion

120, 122 : 보강주름부 130 : 접착부재120, 122: reinforcing wrinkles 130: adhesive member

140 : 충진부재 150 : 박막부재140: filling member 150: thin film member

Claims (6)

액화천연가스 화물창의 단열구조에 있어서,In the insulation structure of the LNG cargo hold, 상기 액화천연가스 화물창을 구성하는 1차 방벽의 멤브레인에 평탄부와 높이차가 나도록 단차부를 두고 형성되는 주름부와 상기 주름부의 내측으로 상기 단차부에 부착 설치되는 보강주름부를 포함하며,A pleated portion formed with a stepped portion so as to have a height difference between the flat portion and a membrane of the primary barrier constituting the LNG gas storage window, and a reinforced fold portion attached to the stepped portion inside the pleated portion, 상기 주름부와 상기 보강주름부의 사이 공간에는 탄성을 가지는 충진부재가 설치되고, 상기 주름부와 상기 충진부재의 사이에 상기 주름부의 내측면을 따라 완충용 박막부재가 부착 설치되는 액화천연가스 화물창의 단열구조.A filling member having elasticity is installed in the space between the crease and the reinforcing wrinkle part, and a thin film member for cushioning is installed along the inner surface of the crease portion between the crease and the filling member. Insulation structure. 제 1 항에 있어서,The method of claim 1, 상기 보강주름부는,The reinforcing wrinkles portion, 편평한 평탄면과, 상기 평탄면으로부터 융기된 융기면으로 구성되며, 상기 융기면의 단면이 반원 또는 다각형인 액화천연가스 화물창의 단열구조.An insulating structure of a LNG cargo hold comprising a flat flat surface and a raised surface raised from the flat surface, wherein the cross section of the raised surface is semicircle or polygonal. 삭제delete 삭제delete 삭제delete 액화천연가스 화물창의 단열구조에 있어서,In the insulation structure of the LNG cargo hold, 상기 액화천연가스 화물창을 구성하는 1차 방벽의 멤브레인에 평탄부와 높이차가 나도록 단차부를 두고 형성되는 주름부와 상기 주름부의 내측으로 상기 단차부에 부착 설치되는 보강주름부를 포함하며,A pleated portion formed with a stepped portion so as to have a height difference between the flat portion and a membrane of the primary barrier constituting the LNG gas storage window, and a reinforced fold portion attached to the stepped portion inside the pleated portion, 상기 주름부의 내측면을 따라 완충용 박막부재가 부착 설치되고,A cushioning thin film member is attached along the inner surface of the wrinkle part, 편평한 평탄면이 상기 단차부에 부착되며 상기 평탄면으로부터 융기된 융기면은 상기 박막부재에 밀착되도록 상기 보강주름부가 설치되는 액화천연가스 화물창의 단열구조.And a flat flat surface is attached to the stepped portion, and the raised surface of the liquefied natural gas cargo hold is installed so that the raised surface is in close contact with the thin film member.
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