KR102426553B1 - Lng storage tank including a insulation structure of secondary barrier to prevent local damage - Google Patents

Lng storage tank including a insulation structure of secondary barrier to prevent local damage Download PDF

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KR102426553B1
KR102426553B1 KR1020170183783A KR20170183783A KR102426553B1 KR 102426553 B1 KR102426553 B1 KR 102426553B1 KR 1020170183783 A KR1020170183783 A KR 1020170183783A KR 20170183783 A KR20170183783 A KR 20170183783A KR 102426553 B1 KR102426553 B1 KR 102426553B1
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secondary barrier
barrier
storage tank
lng
lng storage
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KR1020170183783A
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Korean (ko)
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KR20190081332A (en
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이재봉
김현승
황윤식
강중규
한성곤
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대우조선해양 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
    • 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
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • B63B2701/10—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • 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
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • 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
    • 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
    • F17C2270/0107—Wall panels

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

Abstract

국부 손상을 방지하는 2차 방벽의 단열구조를 포함하는 LNG 저장탱크가 개시된다. 본 발명은 2차 방벽에 형성되는 주름부의 상부에 열수축의 영향을 적게 받는 막음판을 마련함으로써, 2차 방벽의 주름부에 LNG가 고이는 것을 차단하고, 이에 따라 헐(hull)에 국부 손상이 발생하는 것을 사전에 방지한다.Disclosed is an LNG storage tank including an insulating structure of a secondary barrier to prevent local damage. The present invention blocks LNG from accumulating in the corrugation of the secondary barrier by providing a barrier plate that is less affected by heat shrinkage on the upper part of the corrugation formed in the secondary barrier, thereby causing local damage to the hull prevent it from happening in advance.

Description

국부 손상을 방지하는 2차 방벽 단열구조를 포함하는 LNG 저장탱크 {LNG STORAGE TANK INCLUDING A INSULATION STRUCTURE OF SECONDARY BARRIER TO PREVENT LOCAL DAMAGE}LNG storage tank with secondary barrier insulation structure to prevent local damage {LNG STORAGE TANK INCLUDING A INSULATION STRUCTURE OF SECONDARY BARRIER TO PREVENT LOCAL DAMAGE}

본 발명은 국부 손상을 방지하는 2차 방벽 단열구조를 포함하는 LNG 저장탱크에 관한 것으로서, 더욱 상세하게는 LNG 저장탱크의 2차 방벽에 형성되는 주름부에 LNG가 고이는 것을 차단하고, 이에 따라 헐(hull)에 국부 손상이 발생하는 것을 방지하는 2차 방벽 단열구조를 포함하는 LNG 저장탱크에 관한 것이다.The present invention relates to an LNG storage tank having a secondary barrier insulation structure that prevents local damage, and more particularly, blocks the LNG from accumulating in a wrinkle formed in a secondary barrier of the LNG storage tank, and thus It relates to an LNG storage tank including a secondary barrier insulation structure that prevents local damage to (hull) from occurring.

일반적으로 천연가스는 육상이나 해상의 가스배관을 통해 가스 상태로 운반되거나, 액화천연가스(Liquefied Natural Gas; 이하, "LNG"라 함)의 상태로 LNG 운반선(LNG carrier)에 저장되어 운반된다. LNG는 메탄(methane)을 주성분으로 하는 천연가스를 대략 -163℃로 냉각하여, 그 부피를 600분의 1로 줄임으로써 해상을 한 원거리 운반에 적합하다. 이러한 LNG의 운반에 사용되는 선박으로는 LNG 운반선 외에도, LNG를 싣고 바다를 운항하여 육상 소요처에 도착한 후, 저장된 LNG를 재기화하여 천연가스 상태로 하역하는 LNG RV(LNG Regasification Vessel)가 있으며, 최근에는 LNG FPSO(LNG Floating, Production, Storage and Offloading)나 LNG FSRU(LNG Floating Storage and Regasification Unit)와 같은 부유식 해상 구조물에 대한 수요가 점차 증가하고 있다.In general, natural gas is transported in a gaseous state through a gas pipe on land or offshore, or is stored and transported in an LNG carrier in the state of liquefied natural gas (hereinafter, referred to as "LNG"). LNG is suitable for long-distance transport by sea by cooling natural gas containing methane as a main component to approximately -163°C and reducing its volume to 1/600. Vessels used for transporting such LNG include LNG RVs (LNG Regasification Vessels) that load LNG and sail the sea to arrive on land, then regasify the stored LNG and unload it into natural gas, in addition to LNG carriers. Recently, the demand for floating offshore structures such as LNG FPSO (LNG Floating, Production, Storage and Offloading) and LNG FSRU (LNG Floating Storage and Regasification Unit) is gradually increasing.

이와 같은 선박이나 부유식 해상 구조물은 초저온 상태로 액화시킨 LNG를 보관 및 저장할 수 있는 LNG 저장탱크(cargo, 화물창이라고도 함)가 구비되는데, 이러한 LNG 저장탱크는 단열재에 화물의 하중이 직접적으로 작용하는지 여부에 따라, 멤브레인형(Membrane Type)과 독립탱크형(Independent Tank)으로 분류할 수 있다. 여기서 멤브레인형 저장탱크는 GTT NO 96형과 Mark Ⅲ형으로 나눠지며, 독립탱크형 저장탱크는 MOSS형과 IHI-SPB형으로 나눠진다.Such ships or floating offshore structures are equipped with an LNG storage tank (also called a cargo hold) that can store and store LNG liquefied in a cryogenic state. Depending on whether or not, it can be classified into a membrane type and an independent tank type. Here, the membrane type storage tank is divided into GTT NO 96 type and Mark Ⅲ type, and the independent tank type storage tank is divided into MOSS type and IHI-SPB type.

도 1에 일반적인 멤브레인형 저장탱크의 단열구조가 개략적으로 도시되어 있다. 도 1을 참조하면, 멤브레인형 저장탱크는 하부 단열패널(10), 2차 방벽(20), 상부 단열패널(30), 그리고 1차 방벽(40)이 헐(hull, h)의 내부 표면 상에 번갈아 적층되어 이루어진다.1 schematically shows a thermal insulation structure of a typical membranous storage tank. 1, the membranous storage tank has a lower insulating panel 10, a secondary barrier 20, an upper insulating panel 30, and a primary barrier 40 on the inner surface of the hull (h). are alternately stacked on

하부 단열패널(10) 및 상부 단열패널(30)은 폴리우레탄 폼(polyurethane foam) 등의 단열재에 플라이우드(plywood) 등으로 이루어진 단열박스가 결합된 샌드위치 구조를 가질 수 있다.The lower insulation panel 10 and the upper insulation panel 30 may have a sandwich structure in which an insulation box made of plywood or the like is combined with an insulation material such as polyurethane foam.

1차 방벽(40)은 저장공간에 저장되는 극저온의 유체가 누출되지 않도록 저장공간을 밀폐하기 위한 것으로 기밀성이 요구된다. 1차 방벽(40)은 초저온 상태에서도 물리적 및 화학적 상태를 유지할 수 있도록, 인바 합금(INVAR), 스테인리스강(SUS), 또는 알류미늄 합금 등의 금속재료를 이용할 수 있다.The primary barrier 40 is for sealing the storage space so that the cryogenic fluid stored in the storage space does not leak, and airtightness is required. The primary barrier 40 may use a metallic material such as INVAR alloy (INVAR), stainless steel (SUS), or an aluminum alloy to maintain a physical and chemical state even in an ultra-low temperature state.

2차 방벽(20)은 하부 단열패널(10)과 상부 단열패널(30) 사이에 마련되어, 화물창 내부에 저장된 유체의 유출을 예비적으로 막아주는 역할을 한다. 즉, 2차 방벽(20)은 1차 방벽(40)이 침투되는 경우에 누출된 극저온의 유체를 2차적으로 밀폐함으로써 하부 단열패널(10) 및 헐(h)을 보호한다.The secondary barrier 20 is provided between the lower insulation panel 10 and the upper insulation panel 30, and serves to preliminarily prevent the leakage of the fluid stored in the cargo hold. That is, the secondary barrier 20 protects the lower insulating panel 10 and the hull (h) by secondary sealing the leaked cryogenic fluid when the primary barrier 40 penetrates.

2차 방벽(20)은 1차 방벽(40)과 동일하게 인바 합금(INVAR), 스테인리스강(SUS), 또는 알류미늄 합금 등의 금속재료를 이용하거나, 리지드 트리플렉스(rigid triplex)와 서플 트리플렉스(supple triplex)를 이용할 수 있다.The secondary barrier 20 uses a metal material such as INVAR alloy (INVAR), stainless steel (SUS), or an aluminum alloy in the same way as the primary barrier 40, or a rigid triplex and a supple triplex (supple triplex) can be used.

한편, 1차 방벽(40)은 극저온의 LNG와 접촉하는 부분으로 저장공간의 온도 변화에 직접적으로 노출되어 있으므로, 1차 방벽(10)의 열수축과 열팽창이 반복되면서 피로가 누적되어 파괴되거나 열수축 발생시 용접 부위가 파손될 수 있다.On the other hand, since the primary barrier 40 is a part in contact with cryogenic LNG and is directly exposed to the temperature change of the storage space, as the thermal contraction and thermal expansion of the primary barrier 10 are repeated, fatigue is accumulated and destroyed or when thermal contraction occurs. Welds may be damaged.

이러한 문제 때문에, 방벽(20, 40)들은 낮은 면강성을 갖기 위해 복수의 주름부(corrugation)를 갖는다. 주름부는 열수축 발생시 일정량 변형됨으로써 용접 부위에서의 열응력을 줄여준다.Because of this problem, the barriers 20 and 40 have a plurality of corrugations to have low surface stiffness. The wrinkle part is deformed by a certain amount when heat shrinkage occurs, thereby reducing the thermal stress in the welding area.

1차 방벽(40)에 형성되는 1차 방벽 주름부(41)는 LNG가 저장되는 저장탱크의 내부를 향하여 볼록하게 형성될 수 있으며, 2차 방벽(20)은 형성되는 2차 방벽 주름부(21)는 헐(hull)을 향한 방향으로 볼록하게 형성될 수 있다.The primary barrier corrugation 41 formed in the primary barrier 40 may be convex toward the inside of the storage tank in which the LNG is stored, and the secondary barrier 20 is formed in the secondary barrier corrugation ( 21) may be formed to be convex in a direction toward the hull.

그런데 이러한 구조에 의하면, 1차 방벽(40)이 손상되어 LNG가 누출되었을 때, 상부 단열패널(30)로 침투한 LNG가 2차 방벽 주름부(21)에 고이는 현상이 발생하며, 2차 방벽 주름부(21)에 축적된 극저온의 LNG에 의해 인접한 헐(h)에 국부적인 손상이 가해지는 문제가 있다.However, according to this structure, when the primary barrier 40 is damaged and LNG leaks, the LNG that has penetrated into the upper insulation panel 30 collects in the secondary barrier corrugation 21, and the secondary barrier There is a problem in that local damage is applied to the adjacent hull (h) by the cryogenic LNG accumulated in the wrinkle part (21).

본 발명이 이루고자 하는 기술적 과제는, LNG 저장탱크의 2차 방벽에 형성되는 주름부의 구조는 그대로 유지하면서, 2차 방벽 주름부의 상측에 마련되는 막음판에 의해 상기 2차 방벽의 주름부에 LNG가 고이는 것을 차단함으로써, 헐(hull)에 국부 손상이 발생하는 것을 사전에 방지하고자 하는 것이다.The technical problem to be achieved by the present invention is that, while maintaining the structure of the corrugation formed on the secondary barrier of the LNG storage tank as it is, the LNG can By blocking pooling, it is intended to prevent local damage to the hull in advance.

상기와 같은 목적을 달성하기 위하여, 본 발명은 헐(hull)의 국부 손상을 방지하는 2차 방벽 단열구조를 포함하는 LNG 저장탱크에 있어서, 상기 LNG 저장탱크는 하부 단열패널, 2차 방벽, 상부 단열패널 및 1차 방벽이 헐의 내부 표면 상에 번갈아 적층된 구조로 이루어지며, 상기 2차 방벽은, 상기 헐을 향한 방향으로 볼록하게 형성된 2차 방벽 주름부와, 상기 2차 방벽 주름부의 상측에 마련되어 상기 2차 방벽 주름부에 누출된 LNG가 축적되는 것을 방지하는 막음판을 포함하는, 2차 방벽 단열구조를 포함하는 LNG 저장탱크를 제공한다.In order to achieve the above object, the present invention provides an LNG storage tank including a secondary barrier insulation structure for preventing local damage to a hull, wherein the LNG storage tank includes a lower insulation panel, a secondary barrier, and an upper portion. The insulation panel and the primary barrier are alternately stacked on the inner surface of the hull, and the secondary barrier includes a secondary barrier corrugation convexly formed in a direction toward the hull, and an upper side of the secondary barrier corrugation. It provides an LNG storage tank including a secondary barrier insulation structure, including a blocking plate for preventing the LNG leaked from the secondary barrier corrugation from accumulating.

상기 막음판은 상기 2차 방벽에 횡방향 및 종방향으로 형성된 다수의 2차 방벽 주름부를 덮도록 격자 형태로 마련될 수 있다.The barrier plate may be provided in a lattice form to cover a plurality of secondary barrier corrugations formed in the transverse and longitudinal directions of the secondary barrier.

상기 막음판은 상기 2차 방벽의 상부에 본딩 또는 알루미늄 테이프에 의해 접합될 수 있다.The blocking plate may be bonded to the upper portion of the secondary barrier by bonding or aluminum tape.

상기 막음판은 복합소재(composite material)로 이루어질 수 있으며, 상기 2차 방벽보다 열수축 계수가 작은 것으로 마련될 수 있다.The blocking plate may be made of a composite material, and may be provided with a thermal contraction coefficient smaller than that of the secondary barrier.

본 발명에 따른 2차 방벽 단열구조를 포함하는 LNG 저장탱크는, LNG 저장탱크의 하부 단열패널과 상부 단열패널 사이에 배치되는 2차 방벽에 형성되는 주름부의 상측을 막음판으로 덮음으로써, 상기 2차 방벽에 형성되는 주름부에 LNG 누출액이 축적되는 것을 방지하고, 이에 따라 헐(hull)에 국부 손상이 발생하는 것을 방지한다.In the LNG storage tank including the secondary barrier insulation structure according to the present invention, the upper side of the corrugation formed in the secondary barrier disposed between the lower insulation panel and the upper insulation panel of the LNG storage tank is covered with a blocking plate, It prevents the LNG leakage from accumulating in the corrugation formed in the car barrier, thereby preventing local damage to the hull.

본 발명에 따르면, 2차 방벽에 형성되는 주름부의 상부에 열수축의 영향을 적게 받는 막음판을 마련함으로써, 2차 방벽의 주름부에 LNG가 고이는 것을 차단하고, 이에 따라 헐(hull)에 국부 손상이 발생하는 것을 사전에 방지하는 효과가 있다.According to the present invention, by providing a barrier plate that is less affected by heat shrinkage on the upper portion of the corrugation formed in the secondary barrier, it blocks LNG from accumulating in the corrugation of the secondary barrier, and thus local damage to the hull This has the effect of preventing this from occurring in advance.

도 1은 일반적인 멤브레인형 LNG 저장탱크의 단열구조를 개략적으로 나타낸 도면이다.
도 2는 본 발명에 따른 2차 방벽 단열구조의 평면도이다.
도 3은 본 발명에 따른 2차 방벽 단열구조를 개략적으로 나타낸 도면이다.
도 4는 본 발명에 따른 2차 방벽 단열구조의 변형 실시예를 나타낸 도면이다.1 is a view schematically showing the insulation structure of a typical membrane-type LNG storage tank.
Figure 2 is a plan view of the secondary barrier insulation structure according to the present invention.
Figure 3 is a view schematically showing the secondary barrier insulation structure according to the present invention.
Figure 4 is a view showing a modified embodiment of the secondary barrier insulation structure according to the present invention.

본 발명과 본 발명의 동작상의 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시 예를 예시하는 첨부 도면 및 첨부 도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예를 설명함으로써, 본 발명을 상세히 설명한다. 각 도면에 제시된 동일한 참조부호는 동일한 부재를 나타낸다.Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

도 2는 본 발명에 따른 2차 방벽 단열구조의 평면도이고, 도 3은 본 발명에 따른 2차 방벽 단열구조를 개략적으로 나타낸 도면이며, 도 4는 본 발명에 따른 2차 방벽 단열구조의 변형 실시예를 나타낸 도면이다.Figure 2 is a plan view of the secondary barrier insulation structure according to the present invention, Figure 3 is a view schematically showing the secondary barrier insulation structure according to the present invention, Figure 4 is a modified implementation of the secondary barrier insulation structure according to the present invention It is a drawing showing an example.

본 발명에 따른 LNG 저장탱크는 도 1에 도시된 내용과 마찬가지로, 하부 단열패널(10), 2차 방벽(20), 상부 단열패널(30), 그리고 1차 방벽(40)이 헐(hull)의 내부 표면 상에 번갈아 적층된 구조로 이루어질 수 있다.In the LNG storage tank according to the present invention, as shown in FIG. 1 , the lower insulating panel 10, the secondary barrier 20, the upper insulating panel 30, and the primary barrier 40 are hull. It may be formed in a structure alternately stacked on the inner surface of the

다만, 본 발명에 따른 LNG 저장탱크는 2차 방벽의 주름부에 LNG가 고이는 것을 방지하기 위한 수단이 더 포함되는 것이 특징인데, 이하 도 2 및 도 3을 참조하여, 2차 방벽 단열구조에 대하여 자세히 살펴보도록 한다. 참고로 도 3은 설명의 편의를 위하여 막음판(100)의 일부를 삭제하고 도시한 것이다.However, the LNG storage tank according to the present invention is characterized in that it further includes means for preventing the LNG from accumulating in the wrinkle part of the secondary barrier. Let's take a closer look. For reference, FIG. 3 shows a part of the diaphragm 100 removed for convenience of explanation.

도 2 및 도 3을 참조하면, 본 발명은 2차 방벽(20)에 형성되는 2차 방벽 주름부(21)의 상측에 마련되어, 상기 2차 방벽 주름부(21)에 LNG가 축적되는 것을 방지하는 막음판(100)을 포함한다.2 and 3, the present invention is provided on the upper side of the secondary barrier corrugation 21 formed in the secondary barrier 20, and prevents LNG from accumulating in the secondary barrier corrugation 21. It includes a blocking plate 100 that does.

막음판(100)은 2차 방벽 주름부(21)가 가지는 폭보다 넓은 폭을 가진 바(bar) 형태로 제작되어, 2차 방벽 주름부(21)의 움푹 패인 공간을 덮을 수 있도록, 2차 방벽(20)의 상부에 접합될 수 있다. The barrier plate 100 is manufactured in the form of a bar having a wider width than the width of the secondary barrier corrugation 21 has, so as to cover the recessed space of the secondary barrier corrugation 21, the secondary It may be bonded to the upper portion of the barrier (20).

따라서, 막음판(100)은 도 2에 도시된 바와 같이 2차 방벽(20)에 횡방향과 종방향으로 형성된 다수의 2차 방벽 주름부(21)의 상측을 덮도록 격자 형태로 마련될 수 있다.Therefore, the barrier plate 100 may be provided in a grid shape to cover the upper side of the plurality of secondary barrier corrugations 21 formed in the transverse and longitudinal directions on the secondary barrier 20 as shown in FIG. 2 . have.

이때 2차 방벽 주름부(21)의 상측을 덮도록 2차 방벽(20)의 상부에 접합되는 막음판(100)은 열수축/열팽창에 유연해야 하기 때문에, 탄소섬유처럼 열수축의 영향이 적은 복합소재(composite material)로 이루어질 수 있으며, 더욱 바람직하게는 막음판(100)은 2차 방벽(20)보다 열수축 계수가 작은 소재로 이루어질 수 있다.At this time, the barrier plate 100 bonded to the upper part of the secondary barrier 20 so as to cover the upper side of the secondary barrier wrinkle part 21 must be flexible to heat shrinkage / thermal expansion, so a composite material with little effect of heat shrinkage like carbon fiber (Composite material), more preferably, the barrier plate 100 may be made of a material having a smaller coefficient of thermal contraction than the secondary barrier (20).

막음판(100)은 2차 방벽(20)의 상부에 본딩이나 알루미늄 테이프에 의해 접합될 수 있다. 또한 본 발명은 간단하게 알루미늄 테이프 자체로 2차 방벽 주름부(21)를 덮는 것도 고려할 수 있다.The barrier plate 100 may be bonded to the upper portion of the secondary barrier 20 by bonding or aluminum tape. In addition, the present invention may simply consider covering the secondary barrier corrugation 21 with aluminum tape itself.

한편, 막음판(100)이 2차 방벽(20)의 상부에 접합되면, 막음판(100)의 두께에 따라 2차 방벽(20)과 상부 단열패널(30) 사이에 막음판(100)의 소정의 이격된 공간이 발생할 수가 있다.On the other hand, when the barrier plate 100 is bonded to the upper portion of the secondary barrier 20, the barrier plate 100 is positioned between the secondary barrier 20 and the upper insulating panel 30 according to the thickness of the barrier plate 100. A predetermined spaced apart space may be generated.

이를 방지하기 위하여, 도 4에 도시된 바와 같이, 막음판(100)의 너비(w)를 2차 방벽 주름부(21)의 상부 간격보다 약간 작게 제작하여, 막음판(100)이 2차 방벽 주름부(21)의 상측에 끼워맞춤되는 방식으로 제작/설치하여 이격 공간이 발생하지 않도록 할 수 있다.In order to prevent this, as shown in Figure 4, the width (w) of the barrier plate 100 is made slightly smaller than the upper gap of the secondary barrier corrugation 21, so that the barrier plate 100 is a secondary barrier It can be manufactured/installed in such a way that it is fitted on the upper side of the wrinkle part 21 so that a spaced space is not generated.

또한, 막음판(100)을 2방향 기억 형상기억합금으로 마련하여, 2차 방벽 주름부(21)의 공간에 배치할 수 있으며, 이때 만약 1차 방벽(40)이 침투되면 누출된 극저온의 LNG에 의해 2차 방벽(20)의 온도가 떨어지면서 막음판(100)이 2차 방벽 주름부(21) 사이에서 펼쳐져서 주름부의 공간을 막도록 구성할 수도 있다.In addition, the barrier plate 100 may be provided with a two-way memory shape memory alloy, and may be disposed in the space of the secondary barrier corrugation 21, at this time, if the primary barrier 40 penetrates, the leaked cryogenic LNG As the temperature of the secondary barrier 20 drops by the diaphragm 100 may be configured to spread between the secondary barrier corrugations 21 to block the space of the corrugations.

더불어 2차 방벽 주름부(21)와 막음판(100) 사이에 형성되는 공간에는 폴리우레탄폼(PUF) 또는 글라스울(glass wool) 등의 플렉시블(flexible)한 유연성 단열재가 삽입되어 전체 단열 성능을 향상시킬 수도 있다.In addition, a flexible flexible insulating material such as polyurethane foam (PUF) or glass wool is inserted in the space formed between the secondary barrier wrinkle part 21 and the diaphragm 100 to improve the overall thermal insulation performance. may be improved.

본 발명에 따르면, LNG 저장탱크의 2차 방벽에서 헐(hull) 측을 향하여 아래로 볼록하게 형성된 2차 방벽 주름부의 상측을 막음판으로 덮음으로써, 주름부가 형성하는 홈에 누출된 LNG가 축적되는 것을 방지하고, 이에 따라 2차 방벽의 상부에 위치하는 상부 단열패널(30, 도 1 참조)에 누출된 LNG가 균일하게 분포될 수 있어, 헐(hull)에 국부적인 손상이 발생하는 것을 방지할 수 있다.According to the present invention, by covering the upper side of the corrugation of the secondary barrier formed convexly downward toward the hull side in the secondary barrier of the LNG storage tank with a blocking plate, the leaked LNG is accumulated in the groove formed by the corrugation. In this way, the leaked LNG can be uniformly distributed to the upper insulation panel 30 (see FIG. 1) located on the upper part of the secondary barrier, thereby preventing local damage to the hull. can

이와 같은 본 발명은 기재된 실시 예에 한정되는 것이 아니고, 본 발명의 사상 및 범위를 벗어나지 않고 다양하게 수정 및 변형할 수 있음은 이 기술의 분야에서 통상의 지식을 가진 자에게 자명하다. 따라서 그러한 수정 예 또는 변형 예들은 본 발명의 특허청구범위에 속한다 하여야 할 것이다.The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

20 : 2차 방벽 21 : 2차 방벽 주름부
100 : 막음판20: secondary barrier 21: secondary barrier wrinkle part
100: blocking board

Claims (6)

헐(hull)의 국부 손상을 방지하는 2차 방벽 단열구조를 포함하는 LNG 저장탱크에 있어서,
상기 LNG 저장탱크는 하부 단열패널, 2차 방벽, 상부 단열패널 및 1차 방벽이 헐의 내부 표면 상에 번갈아 적층된 구조로 이루어지며,
상기 2차 방벽은,
상기 헐을 향한 방향으로 볼록하게 형성된 2차 방벽 주름부; 및
상기 2차 방벽 주름부가 형성하는 공간을 덮어 상기 1차 방벽의 누설 발생시 누출된 LNG가 상기 공간에 고이는 것을 차단하는 막음판을 포함하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.In the LNG storage tank comprising a secondary barrier insulation structure to prevent local damage to the hull,
The LNG storage tank has a structure in which a lower insulating panel, a secondary barrier, an upper insulating panel and a primary barrier are alternately stacked on the inner surface of the hull,
The second barrier is
a secondary barrier corrugation formed convexly in the direction toward the hull; and
and a blocking plate that covers the space formed by the secondary barrier corrugation and blocks the leaking LNG from accumulating in the space when the primary barrier leaks.
An LNG storage tank including a secondary barrier insulation structure. 청구항 1에 있어서,
상기 막음판은 상기 2차 방벽에 횡방향 및 종방향으로 형성된 다수의 2차 방벽 주름부를 덮도록 격자 형태로 마련되는 것을 특징으로 하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.The method according to claim 1,
The barrier plate is characterized in that it is provided in a lattice form to cover a plurality of secondary barrier corrugations formed in the transverse and longitudinal directions on the secondary barrier,
An LNG storage tank including a secondary barrier insulation structure. 청구항 1에 있어서,
상기 막음판은 상기 2차 방벽의 상부에 본딩 또는 알루미늄 테이프에 의해 접합되는 것을 특징으로 하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.The method according to claim 1,
The blocking plate is characterized in that it is bonded to the upper portion of the secondary barrier by bonding or aluminum tape,
An LNG storage tank including a secondary barrier insulation structure. 청구항 1에 있어서,
상기 막음판은 복합소재(composite material)로 이루어지는 것을 특징으로 하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.The method according to claim 1,
The blocking plate is characterized in that made of a composite material,
An LNG storage tank including a secondary barrier insulation structure. 청구항 1에 있어서,
상기 막음판은 상기 2차 방벽보다 열수축 계수가 작은 것을 특징으로 하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.The method according to claim 1,
The barrier plate is characterized in that the thermal contraction coefficient is smaller than that of the secondary barrier,
An LNG storage tank including a secondary barrier insulation structure. 청구항 1에 있어서,
상기 2차 방벽 주름부와 상기 막음판 사이의 공간에 삽입되는 유연성 단열재를 더 포함하는,
2차 방벽 단열구조를 포함하는 LNG 저장탱크.The method according to claim 1,
Further comprising a flexible insulating material inserted into the space between the secondary barrier corrugation and the blocking plate,
An LNG storage tank including a secondary barrier insulation structure.
KR1020170183783A 2017-12-29 2017-12-29 Lng storage tank including a insulation structure of secondary barrier to prevent local damage KR102426553B1 (en)

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