KR101034472B1 - Insulation structure for independence type liquified gas tank and method for forming the insulation structure - Google Patents

Insulation structure for independence type liquified gas tank and method for forming the insulation structure Download PDF

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KR101034472B1
KR101034472B1 KR1020100080262A KR20100080262A KR101034472B1 KR 101034472 B1 KR101034472 B1 KR 101034472B1 KR 1020100080262 A KR1020100080262 A KR 1020100080262A KR 20100080262 A KR20100080262 A KR 20100080262A KR 101034472 B1 KR101034472 B1 KR 101034472B1
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South Korea
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heat insulating
liquefied gas
layer
heat
insulating layer
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KR1020100080262A
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Korean (ko)
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최진석
임재인
황영호
최진호
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주식회사 화인텍
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    • 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
    • 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
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • 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
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PURPOSE: An insulation structure of an independent liquefied gas tank and a forming method thereof are provided to efficiently use a space in a construction field and to improve productivity by reducing equipment and labor. CONSTITUTION: An insulation structure of an independent liquefied gas tank comprises insulation layers(3,5). The insulation layers are formed on the outer surface of a tank body(1) for accepting liquefied gas. The insulation layers are formed by stacking two or more insulation materials which have different densities. The insulation material that has relatively high density is formed to be contiguous to the tank body. A reinforcing layer(7) is inserted between the insulation layers and prevents damage to the tank body. A protective layer(9) is formed on the outer top of the insulation layers and prevents foreign substances from flowing into the insulation layers.

Description

독립형 액화가스 탱크의 단열구조 및 그 형성방법{INSULATION STRUCTURE FOR INDEPENDENCE TYPE LIQUIFIED GAS TANK AND METHOD FOR FORMING THE INSULATION STRUCTURE}INSULATION STRUCTURE FOR INDEPENDENCE TYPE LIQUIFIED GAS TANK AND METHOD FOR FORMING THE INSULATION STRUCTURE}

본 발명은 LNG나 LPG 등의 액화가스를 저장하기 위해 설치되는 독립형 액화가스 탱크의 단열구조 및 그 형성방법에 관한 것으로서, 더욱 상세하게는 탱크 몸체의 외부에 단열재를 설계된 두께로 스프레이하여 이루어지는 독립형 액화가스 탱크의 단열구조 및 그 형성방법에 관한 것이다.The present invention relates to an insulating structure of a standalone liquefied gas tank that is installed to store liquefied gas, such as LNG or LPG, and a method of forming the same. A heat insulating structure of a gas tank and a method of forming the same.

천연가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 액화된 액화천연가스(LNG) 또는 액화석유가스(LPG)의 상태로 LNG 수송선에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온(대략 -163℃)으로 냉각하여 얻어지며 액화석유가스는 천연가스의 정제 중 분리되어 저온(대략 -50℃)으로 냉각하여 얻어질 수 있는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대폭 줄어들므로 원거리 운반에 매우 적합하다.Natural gas is transported in a gaseous state through onshore or offshore gas piping, or transported to a distant consumer while being stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG) or liquefied petroleum gas (LPG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (approximately -163 ℃), and liquefied petroleum gas can be obtained by separating during refining of natural gas and cooling it to low temperature (approximately -50 ℃). Its volume is greatly reduced than when it is, so it is very suitable for long distance transportation.

LNG나 LPG 등의 액화가스를 싣고 바다를 운항하여 육상 소요처에 액화가스를 하역하기 위한 액화가스 수송선이나, 마찬가지로 LNG를 싣고 바다를 운항하여 육상 소요처에 도착한 후 저장된 LNG를 재기화하여 천연가스 상태로 하역하는 LNG RV(Regasification Vessel)는, 액화가스의 극저온에 견딜 수 있는 저장탱크(흔히, '화물창'이라고 함)를 포함한다.A liquefied gas carrier for liquefied gas to be transported to the sea by loading liquefied gas such as LNG or LPG, or similarly natural gas by regasifying the stored LNG after arriving at the land by carrying the sea with LNG. The LNG Regasification Vessel (RV), which is unloaded in a state, includes a storage tank (commonly referred to as a 'cargo') that can withstand cryogenic temperatures of liquefied gas.

이 저장탱크는 단열재에 화물의 하중이 직접적으로 작용하는지 여부에 따라 독립형(Independent Type)과 멤브레인형(Membrane Type)으로 분류할 수 있으며, 통상 멤브레인형 저장탱크는 GT NO 96형과 TGZ Mark Ⅲ형으로 나눠지고, 독립형 저장탱크는 MOSS형과 SPB형으로 나눠진다. MOSS형의 독립형 저장탱크의 구조는 대한민국 특허 제 10-15063 호 등에 기재되어 있고, SPB형의 독립형 저장탱크의 구조는 대한민국 특허 제 10-305513 호 등에 기재되어 있다.These storage tanks can be classified into independent type and membrane type depending on whether the load directly affects the insulation material.Membrane type storage tanks are usually GT NO 96 type and TGZ Mark III type. Independent storage tanks are divided into MOSS type and SPB type. The structure of the MOSS type independent storage tank is described in Korean Patent No. 10-15063 and the like, and the structure of the SPB type independent storage tank is described in Korean Patent No. 10-305513 and the like.

독립형 저장탱크는, IMO 규정에 따라 A, B, C 형으로 세분될 수 있다.Stand-alone storage tanks can be subdivided into types A, B and C in accordance with IMO regulations.

일반적으로 가장 많이 사용되는 Type B의 독립형 저장탱크는 알루미늄 합금이나 SUS, 및 9% 니켈 등 저온에 강한 합금으로 제조된 탱크 몸체에 폴리우레탄과 같은 비교적 단단한 단열 패널을 부착시켜 만들어지며, 선체의 내부 바닥에 배열되는 복수의 탱크 지지체 상에 놓여진다.In general, the most commonly used Type B independent storage tank is made by attaching a relatively rigid insulation panel such as polyurethane to a tank body made of aluminum alloy, SUS, and 9% nickel-resistant alloy. It is placed on a plurality of tank supports arranged at the bottom.

압력용기 형태를 가지는 Type C의 독립형 저장탱크 역시 액화가스를 선적할 경우 외부의 열로 인하여 액화가스가 기화되어 저장탱크의 내부압력이 상승하는 것을 방지하기 위해 저장탱크의 외부에 단열을 실시하고 있다. Type C의 독립형 저장탱크에 있어서 2차 방벽은 필요하지 않다.Type C stand-alone storage tanks with pressure vessels are also insulated from the outside of storage tanks in order to prevent liquefied gas from vaporizing due to external heat when the liquefied gas is loaded. In Type C standalone storage tanks, no secondary barrier is required.

폴리우레탄 폼에 의해 제조된 다수의 단열 패널을 탱크 몸체의 외부에 설치하는 액화가스 저장탱크의 단열구조는 대한민국 특허 제 10-166608 호 등에 기재되어 있다.The insulation structure of the liquefied gas storage tank for installing a plurality of insulation panels made of polyurethane foam on the outside of the tank body is described in Korean Patent No. 10-166608.

종래기술에 따른 독립형 액화가스 탱크의 단열구조에 의하면, 탱크 몸체의 외부에 단열 패널을 연달아 부착시켜 탱크 내부에 수용된 액화가스에 외부로부터의 열이 전달되는 것을 방지하고 있다. 열전달을 차단하기 위해서 단열 패널은 소정의 계산된 두께를 가지도록 제작된다.According to the heat insulation structure of the independent liquefied gas tank according to the prior art, heat insulation panels are successively attached to the outside of the tank body to prevent heat from being transferred to the liquefied gas contained inside the tank. Insulating panels are manufactured to have a predetermined calculated thickness to block heat transfer.

또한, 극저온의 액화가스를 수용하는 것에 기인하는 탱크 몸체의 수축에 따라 적절히 작용하여 단열 패널의 응력 발생을 방지할 수 있도록, 탱크 몸체의 외부에 배열되는 단열 패널들의 사이에는 저온에서도 탄성을 가지는 단열재가 설치된다.In addition, a heat insulating material having elasticity even at low temperatures between the heat insulating panels arranged on the outside of the tank body so as to properly act according to the shrinkage of the tank body due to receiving the cryogenic liquefied gas to prevent the occurrence of stress in the heat insulating panel. Is installed.

종래기술에 따르면, 하나의 단열 패널을 탱크 몸체의 외부에 부착시키기 위해서, 우선 탱크 몸체의 외부에 스터드 등의 장착부재를 용접으로 부착시킨 후, 이 장착부재에 원통형 부재와 지지부재를 결합하고, 계속해서 지지부재에 단열 패널을 끼워 와셔 및 너트로 체결하는 작업을 수행하였다. 여기에서, 지지부재는 양단에 나사산이 형성된 봉 형상의 막대이고, 원통형 부재는 단열 패널을 보호하기 위해 장착부재와 단열 패널 사이에 개재되는 부품이다.According to the prior art, in order to attach one insulation panel to the outside of the tank body, first attaching a mounting member such as a stud to the outside of the tank body by welding, and then joining the cylindrical member and the supporting member to the mounting member, Subsequently, the insulation panel was fitted to the support member to perform the work of fastening with the washer and the nut. Here, the support member is a rod-shaped rod with threads formed at both ends, and the cylindrical member is a part interposed between the mounting member and the heat insulation panel to protect the heat insulation panel.

또한, 종래기술에 따르면, 단열 패널과 또 다른 단열 패널 사이는 일정한 간격을 두고 이격되도록 배치된다. 단열 패널의 가장자리에는 단차가 형성되어 있기 때문에, 탱크 몸체와 가까운 저온측 갭의 간격보다 탱크 몸체로부터 먼 상온측 갭의 간격이 더욱 넓게 형성되어 있다.In addition, according to the prior art, the insulation panel and the other insulation panel is arranged to be spaced apart at regular intervals. Since the step | step difference is formed in the edge of a heat insulation panel, the space | interval of the normal temperature side gap far from a tank body is formed more wide than the space | interval of the low temperature side gap close to a tank body.

저온측 갭 내에는 저온에서 탄성을 갖는 유리 울(glass woll)과 같은 단열물질이 충전되어 있으며, 상온측 갭 내에는 상온에 가까운 온도에서 단열 패널보다 높은 탄성을 가지는 폴리에틸렌 폼 등과 같은 단열물질이 충전될 수 있다.The low temperature side gap is filled with an insulating material such as glass wool having elasticity at low temperature, and the high temperature side gap is filled with an insulating material such as polyethylene foam having higher elasticity than the insulating panel at a temperature close to room temperature. Can be.

이와 같이 종래기술에 따른 액화가스 저장탱크의 단열구조는 탱크 몸체에 복수개의 단열 패널을 이어 붙임으로써 단열층을 형성하기 때문에, 단열 패널들 사이에 연결부가 존재하여 단열 효과가 저하되고 연결부의 조립이 복잡하다는 문제가 있다.As described above, the heat insulation structure of the liquefied gas storage tank according to the prior art forms a heat insulation layer by attaching a plurality of heat insulation panels to the tank body, and thus there is a connection between the heat insulation panels, which lowers the heat insulation effect and complicates the assembly of the connection. There is a problem.

또한, 외부에서 별도로 제작된 단열 패널을 공급받아 탱크 몸체에 부착시켜 이루어지므로 조립 전에 단열 패널을 적재시켜 두기 위한 공간이 필요하고, 단열 패널의 제작 및 조립과정에 있어서 다량의 폐기물이 발생하는 문제가 있다.In addition, since the insulation panel manufactured separately from the outside is supplied and attached to the tank body, a space for loading the insulation panel before assembly is required, and a large amount of waste is generated in the manufacturing and assembly process of the insulation panel. have.

또한, 종래기술에 따른 액화가스 저장탱크의 단열구조는, 단열 패널이 소정의 두께를 가져야 하기 때문에, 단열 패널 설치시의 작업성 등을 감안하여 하나의 단열 패널의 크기를 일정수준 이상으로 증가시키지 못하므로 단열 패널 설치작업에 많은 시간과 노력이 소요되는 문제가 있다.In addition, the heat insulation structure of the liquefied gas storage tank according to the prior art does not increase the size of one heat insulation panel to a predetermined level or more in consideration of workability when installing the heat insulation panel, etc., since the heat insulation panel must have a predetermined thickness. Since there is a problem that takes a lot of time and effort to install the insulation panel.

이러한 종래의 문제점들을 해결하기 위한 본 발명은, 밀도가 서로 상이한 2 이상의 단열물질을 탱크 몸체의 외부에 설계된 두께만큼 스프레이하여 단열구조를 형성함으로써, 단열 효과를 증대시키고 단열층의 형성을 더욱 용이하고 신속하게 수행할 수 있는 독립형 액화가스 탱크의 단열구조 및 그 형성방법을 제공하고자 하는 것이다.The present invention for solving these problems, by spraying two or more insulating materials of different densities to the thickness of the outside of the tank body to form a heat insulating structure, thereby increasing the heat insulating effect and more easily and quickly form the heat insulating layer It is to provide a heat insulating structure and a method of forming the independent liquefied gas tank that can be performed easily.

상기 목적을 달성하기 위한 본 발명에 따르면, 액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조로서, 액화가스를 수용하는 탱크 몸체의 외부에 스프레이되어 형성되는 단열층을 포함하며, 상기 단열층은 밀도가 서로 상이한 2개 이상의 단열재가 적층되어 형성되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조가 제공된다.According to the present invention for achieving the above object, as a heat insulating structure of a standalone liquefied gas tank for storing the liquefied gas, including a heat insulating layer formed by spraying on the outside of the tank body containing the liquefied gas, the heat insulating layer has a density Provided is a heat insulating structure of a standalone liquefied gas tank, characterized in that the two or more different heat insulating materials are laminated and formed.

상기 단열층은, 밀도가 서로 상이한 2개 이상의 단열재 중 밀도가 상대적으로 높은 단열재일수록 상기 탱크 몸체에 인접하도록 스프레이하여 적층함으로써 형성되는 것이 바람직하다.Preferably, the heat insulation layer is formed by spraying and stacking the heat insulation material closer to the tank body as the heat insulation material having a higher density among two or more heat insulation materials having different densities from each other.

상기 독립형 액화가스 탱크의 단열구조는, 상기 단열층의 내부에 매립되어 열 충격 및 상기 탱크 몸체의 열 변형으로 인한 손상을 방지하는 보강층을 더 포함하는 것이 바람직하다.Insulating structure of the independent liquefied gas tank, it is preferable to further include a reinforcing layer embedded in the heat insulating layer to prevent damage due to thermal shock and thermal deformation of the tank body.

상기 보강층은 밀도가 서로 상이한 단열재로 각각 이루어진 2개 이상의 단열층들 사이에 개재되는 것이 바람직하다.The reinforcing layer is preferably interposed between two or more insulating layers each made of heat insulating materials having different densities.

상기 단열층의 외부표면 상에는 외부로부터 유입될 수 있는 이물질을 차단하고 기계적 손상을 방지하기 위한 보호층이 스프레이되어 형성되는 것이 바람직하다.On the outer surface of the heat insulating layer is preferably formed by spraying a protective layer to block foreign substances that may be introduced from the outside and to prevent mechanical damage.

상기 단열층을 형성하는 단열재는 폴리우레탄 폼인 것이 바람직하다.It is preferable that the heat insulating material which forms the said heat insulation layer is a polyurethane foam.

상기 단열층은, 밀도가 서로 상이한 2개 이상의 단열재 중 밀도가 상대적으로 높은 단열재일수록 얇은 두께를 가지도록 스프레이하여 적층함으로써 형성되는 것이 바람직하다.The heat insulating layer is preferably formed by spraying and stacking a thinner insulating material having a higher density among two or more heat insulating materials having different densities.

상기 액화가스는 액화천연가스인 것이 바람직하다.The liquefied gas is preferably liquefied natural gas.

상기 보강층은 상기 탱크 몸체와 상기 단열층 사이에 개재되는 것이 바람직하다.The reinforcement layer is preferably interposed between the tank body and the heat insulation layer.

또한, 본 발명의 다른 측면에 따르면, 액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조로서, 밀도가 상대적으로 높은 단열재를 상기 독립형 액화가스 탱크의 탱크 몸체 외부에 스프레이하여 형성하는 제1 단열층과; 밀도가 상대적으로 낮은 단열재를 상기 제1 단열층 상에 스프레이하여 형성하는 제2 단열층과; 상기 제1 단열층 및 상기 제2 단열층 사이에 매립되어 열 충격 및 상기 탱크 몸체의 열 변형으로 인한 손상을 방지하는 보강층과; 상기 단열층의 손상을 방지하고 이물질을 차단하기 위해 상기 제2 단열층 상에 스프레이하여 형성하는 보호층; 을 포함하는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조가 제공된다.In addition, according to another aspect of the present invention, as a heat insulating structure of the independent liquefied gas tank for storing the liquefied gas, a first heat insulating layer formed by spraying a relatively high density of heat insulating material to the outside of the tank body of the independent liquefied gas tank; ; A second heat insulating layer formed by spraying a heat insulating material having a relatively low density on the first heat insulating layer; A reinforcing layer buried between the first heat insulating layer and the second heat insulating layer to prevent damage due to thermal shock and thermal deformation of the tank body; A protective layer formed by spraying on the second insulating layer to prevent damage to the insulating layer and to block foreign substances; Provided is an insulating structure of a standalone liquefied gas tank comprising a.

또한, 본 발명의 또 다른 측면에 따르면, 액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조 형성방법으로서, 액화가스를 수용하는 탱크 몸체의 외부에 단열재를 스프레이하여 단열층을 형성하되, 상기 단열층은 밀도가 서로 상이한 2 이상의 단열재를 각각 순차적으로 스프레이하여 적층함으로써 형성되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조 형성방법이 제공된다.In addition, according to another aspect of the present invention, as a method for forming a heat insulating structure of a standalone liquefied gas tank for storing liquefied gas, by forming a heat insulating layer by spraying a heat insulating material on the outside of the tank body containing the liquefied gas, the heat insulating layer is Provided is a method of forming a heat insulation structure for a standalone liquefied gas tank, characterized in that formed by sequentially spraying and stacking two or more heat insulating materials having different densities.

상기 단열층의 내부에는 보강층이 매립되는 것이 바람직하다.It is preferable that a reinforcement layer is embedded in the heat insulation layer.

상기 독립형 액화가스 탱크의 단열구조 형성방법은, 상대적으로 밀도가 높은 단열재로 이루어진 제1 단열층을 스프레이하여 형성하는 단계와, 상기 제1 단열층 상에 상기 보강층을 형성하는 단계와, 상기 보강층 상에 상대적으로 밀도가 낮은 단열재로 이루어진 제2 단열층을 스프레이하여 형성하는 단계를 포함하는 것이 바람직하다.The method of forming a heat insulation structure of the independent liquefied gas tank may include forming a first heat insulation layer made of a relatively dense heat insulation material, forming the reinforcement layer on the first heat insulation layer, and forming a relative on the reinforcement layer. It is preferable to include a step of forming by spraying a second heat insulating layer made of a low density heat insulating material.

상술한 바와 같은 본 발명에 의하면, 밀도가 서로 상이한 2 이상의 단열물질을 탱크 몸체의 외부에 설계된 두께만큼 스프레이하여 단열구조를 형성한 독립형 액화가스 탱크의 단열구조 및 그 형성방법이 제공될 수 있다.According to the present invention as described above, it is possible to provide a heat insulating structure and a method of forming the independent liquefied gas tank by forming a heat insulating structure by spraying two or more heat insulating materials having different densities with the designed thickness on the outside of the tank body.

그에 따라 본 발명의 단열구조에 의하면, 별도의 연결부가 존재하지 않아 단열 효과를 증대시킬 수 있으며, 설치에 필요한 부품이 감소되어 단열구조의 형성을 위해 소요되는 시간 및 노력을 절감할 수 있게 된다.Accordingly, according to the heat insulation structure of the present invention, there is no separate connection portion can increase the heat insulation effect, and the parts required for installation can be reduced to reduce the time and effort required for the formation of the heat insulation structure.

또한, 단열재의 수명을 연장시킬 수 있고 유지보수 비용과 각종 자재비가 절감될 수 있다. 아울러, 단열 패널을 사용하던 종래기술에 비해 단열 패널을 적재시켜 둘 별도의 공간이 필요하지 않아 현장에서의 공간 활용도가 향상되고 장비 및 인력 감축으로 인해 생산성이 향상될 수 있다.In addition, the life of the insulation can be extended and maintenance costs and various material costs can be reduced. In addition, compared to the prior art using a heat insulation panel, there is no need for two separate spaces by loading the heat insulation panel, thereby improving space utilization in the field and improving productivity due to equipment and manpower reduction.

또한, 본 발명에 의하면 단열재를 스프레이하여 단열구조를 형성하므로 제조 과정에서 폐기물 발생이 현저히 감소될 수 있다.In addition, according to the present invention, since the insulating material is sprayed to form an insulating structure, waste generation in the manufacturing process may be significantly reduced.

도 1은 본 발명의 바람직한 실시형태에 따른 독립형 액화가스 탱크의 단열구조를 나타내는 단면도,
도 2는 본 발명의 변형 실시예에 따른 독립형 액화가스 탱크의 단열구조를 나타내는 단면도, 그리고
도 3은 본 발명의 다른 변형 실시예에 따른 독립형 액화가스 탱크의 단열구조를 나타내는 단면도이다.1 is a cross-sectional view showing an insulating structure of a standalone liquefied gas tank according to a preferred embodiment of the present invention,
2 is a cross-sectional view showing an insulating structure of a standalone liquefied gas tank according to a modified embodiment of the present invention, and
3 is a cross-sectional view showing an insulating structure of a standalone liquefied gas tank according to another modified embodiment of the present invention.

이하, 본 발명의 바람직한 실시예에 따른 독립형 액화가스 탱크의 단열구조를, 도면을 참조하여 상세하게 설명한다.Hereinafter, a heat insulation structure of a standalone liquefied gas tank according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

본 발명의 바람직한 실시예에 따른 독립형 액화가스 탱크의 단열구조는, 대략 원통형 압력용기 혹은 다각형 상자의 형태를 가지는 독립형 액화가스 탱크에 적용될 수 있으며, 이하에서는 독립형 액화가스 탱크에 본 발명의 단열구조가 적용되는 것으로 예를 들어 설명한다. 본 발명의 단열구조가 적용되는 탱크의 형상은 특별히 한정되지 않음은 물론이다.Insulating structure of the stand-alone liquefied gas tank according to a preferred embodiment of the present invention, can be applied to the stand-alone liquefied gas tank having a form of a substantially cylindrical pressure vessel or polygonal box, in the following, It demonstrates as an example to apply. Of course, the shape of the tank to which the heat insulation structure of the present invention is applied is not particularly limited.

도 1에 도시된 바와 같이, 본 발명에 따른 독립형 액화가스 탱크의 단열구조는, 탱크 몸체(1)의 외부에 밀도가 상대적으로 높은 단열재로 이루어지는 제1 단열층(3)과, 밀도가 상대적으로 낮은 단열재로 이루어지는 제2 단열층(5)을 스프레이 방식으로 적층시키되, 이들 제1 단열층(3)과 제2 단열층(5) 사이에 보강재(crack arrester)에 의한 보강층(7)을 개재시켜 이루어진다.As shown in FIG. 1, the heat insulating structure of the independent liquefied gas tank according to the present invention includes a first heat insulating layer 3 made of a heat insulating material having a relatively high density on the outside of the tank body 1, and a relatively low density. The second heat insulating layer 5 made of a heat insulating material is laminated by a spray method, but is made by interposing a reinforcing layer 7 by a crack arrester between the first heat insulating layer 3 and the second heat insulating layer 5.

제2 단열층(5)의 외부표면 상에는 외부로부터 유입될 수 있는 수분 등의 이물질을 차단하고, 기계적 손상을 방지하기 위한 보호층(9)을 스프레이 방식 등을 통하여 적층시키는 것이 바람직하다.On the outer surface of the second heat insulating layer 5, it is preferable to block foreign substances such as moisture that may be introduced from the outside, and to laminate the protective layer 9 for preventing mechanical damage by spraying or the like.

탱크 내에 LNG를 저장할 경우, LNG의 온도는 대략 -163℃ 정도로서 대략 -50℃ 정도의 온도를 갖는 LPG에 비해 매우 낮으므로, 이러한 초저온 상태에서의 수축 및 팽창에 따른 열 충격을 견딜 수 있도록 단열 구조를 구성할 필요가 있다.When storing LNG in a tank, the temperature of LNG is about -163 ° C., which is much lower than that of LPG having a temperature of about -50 ° C., so that the thermal insulation structure can withstand thermal shock due to shrinkage and expansion in such ultra low temperature state. You need to configure

본 발명의 단열구조는 밀도가 서로 상이한 2개 이상의 단열층과 그 사이에 개재된 보강재를 포함하여 이루어지기 때문에, 본 발명의 단열구조가 적용된 탱크 내에 초저온 상태의 LNG를 저장하더라도, 탱크에 열 충격으로 인한 손상이나 파손이 발생하지 않게 된다.Since the heat insulation structure of the present invention includes two or more heat insulation layers having different densities and a reinforcement interposed therebetween, even if the LNG is stored in a cryogenic state in a tank to which the heat insulation structure of the present invention is applied, the tank may be subjected to thermal shock. No damage or breakage occurs.

제1 및 제2 단열층을 형성하는 단열재로서는 예컨대 폴리우레탄 폼이 사용될 수 있다. 특히, 상대적으로 탱크 몸체(1)에 가까운 제1 단열층(3)으로서는 상대적으로 탱크 몸체(1)에서 멀리 떨어진 제2 단열층(5)보다 밀도가 높은 폴리우레탄 폼을 사용하는 것이 바람직하다. 위에서는 단열층이 밀도가 상이한 2개의 단열재로 이루어진 것을 예로서 설명하였지만, 3개 이상의 밀도가 서로 상이한 단열재로 단열층을 형성할 경우에도 탱크 몸체(1)에 가까울수록 밀도가 높은 단열재를 사용하는 것이 바람직하다.As the heat insulating material for forming the first and second heat insulating layers, for example, polyurethane foam can be used. In particular, it is preferable to use a polyurethane foam having a higher density than the second heat insulating layer 5 relatively far from the tank body 1 as the first heat insulating layer 3 relatively close to the tank body 1. In the above description, the insulation layer is composed of two insulation materials having different densities, but when the insulation layer is formed of insulation materials having three or more densities, it is preferable to use a heat insulation material having a higher density as the tank body 1 is closer to the tank body 1. Do.

또한, 제1 단열층(3)과 제2 단열층(5)의 두께는 서로 동일한 값을 가질 수도 있지만, 재료비를 감안할 때 밀도가 높은 단열재로 이루어진 단열층의 두께를 밀도가 낮은 단열재로 이루어진 단열층보다 상대적으로 얇게 하는 것이 바람직하다. 따라서, 도 1에 도시된 실시예에서는 상대적으로 밀도가 높은 제1 단열층(3)보다 상대적으로 밀도가 낮은 제2 단열층(5)을 두껍게 형성하는 것이 바람직하다. 위에서는 단열층이 밀도가 상이한 2개의 단열재로 이루어진 것을 예로서 설명하였지만, 3개 이상의 밀도가 서로 상이한 단열재로 단열층을 형성할 경우에도 밀도가 높을수록 두께를 얇게 하는 것이 바람직하다.In addition, the thickness of the first heat insulating layer 3 and the second heat insulating layer 5 may have the same value, but considering the material cost, the thickness of the heat insulating layer made of a high density heat insulating material is relatively higher than that of the heat insulating layer made of a low density heat insulating material. It is desirable to make it thin. Therefore, in the embodiment shown in FIG. 1, it is preferable to form a thicker second heat insulating layer 5 having a lower density than the first heat insulating layer 3 having a relatively high density. In the above, the heat insulation layer has been described as an example of two heat insulating materials having different densities. However, when the heat insulation layer is formed of heat insulating materials having three or more densities, the thickness is preferably thinner.

본 발명의 단열구조에 따르면, 밀도가 서로 상이한 2개 이상의 단열층을 형성하는 것만으로도, 초저온 상태의 LNG를 저장하고 있는 탱크에 열 충격으로 인한 손상이나 파손이 발생하지 않게 된다. 하지만, 밀도가 서로 상이한 단열층들 사이에 보강층(7)을 형성하면, 열수축이나 열팽창으로 인하여 발생한 크랙이 어느 하나의 단열층에서 인접한 다른 단열층으로 퍼져나가는 것을 방지할 수 있다는 효과를 거둘 수 있다.According to the heat insulating structure of the present invention, even if two or more heat insulating layers having different densities are formed, damage or breakage due to thermal shock does not occur in the tank storing the LNG in the cryogenic state. However, if the reinforcing layer 7 is formed between heat insulating layers having different densities, cracks caused by thermal contraction or thermal expansion can be prevented from spreading from one heat insulating layer to another adjacent heat insulating layer.

보강층(7)을 형성하기 위한 보강재로서는 상술한 바와 같이 단열층과 단열층 사이의 크랙 전파를 방지할 수 있다면 어떠한 재질의 것도 사용할 수 있으며, 예를 들어 그물망 형태의 유리 섬유, 유리 천, 박판 형태의 금속막, 그물망 형태의 금속 망, 탄성중합체나 플라스틱 소재의 그물망이나 시트 등을 사용할 수 있다.As the reinforcing material for forming the reinforcing layer 7, any material can be used as long as it can prevent crack propagation between the heat insulating layer and the heat insulating layer as described above. For example, a mesh-type glass fiber, a glass cloth, a thin metal plate A film | membrane, a metal mesh of a mesh form, a mesh | network, a sheet | seat of an elastomer, a plastics material, etc. can be used.

수분 차단 및 기계적 손상 방지를 위해 단열층의 외부에 적층되도록 스프레이되는 보호층(9)으로서는 종래에 공지되어 있는 어떠한 소재의 것이라도 사용될 수 있다.As the protective layer 9 sprayed so as to be laminated to the outside of the heat insulating layer for blocking moisture and preventing mechanical damage, any material known in the art may be used.

도 1을 참조하여 이루어진 설명에서는, 탱크 몸체(1)의 외부에 밀도가 서로 상이한 제1 단열층(3)과 제2 단열층(5)이 적층되도록 스프레이되어 형성되고, 이들 제1 및 제2 단열층 사이에 보강층(7)이 매립되어 있는 실시예가 예로서 설명되고 있다. 그러나, 본 발명의 변형예들에 따르면, 도 2에 도시된 바와 같이 보강층(7)이 탱크 몸체(1)와 제1 단열층(3) 사이에 형성될 수도 있고, 도 3에 도시된 바와 같이 보강층(7)이 탱크 몸체(1)와 제1 단열층(3) 사이 그리고 제1 단열층(3)와 제2 단열층(5) 사이에 각각 형성될 수도 있다.In the description made with reference to FIG. 1, the first heat insulating layer 3 and the second heat insulating layer 5 having different densities are formed on the outside of the tank body 1 so as to be sprayed so as to be stacked, and between these first and second heat insulating layers. The embodiment in which the reinforcing layer 7 is embedded is described as an example. However, according to variants of the invention, a reinforcement layer 7 may be formed between the tank body 1 and the first heat insulating layer 3 as shown in FIG. 2, and as shown in FIG. 3. (7) may be formed between the tank body 1 and the first heat insulating layer 3 and between the first heat insulating layer 3 and the second heat insulating layer 5, respectively.

한편, 도시하지는 않았지만, 밀도가 서로 상이한 3개 이상의 단열층이 적층 형성되는 경우에도, 보강층(7)은 탱크 몸체와 단열층 사이 그리고 단열층과 단열층 사이 중 적어도 한 곳에 형성될 수 있다. 특히, 3개 이상의 단열층이 적층 형성되는 경우에는 서로 밀도가 상이한 단열층 사이에 모두 보강층이 형성될 수도 있고 그 중 하나 이상에 보강층이 형성될 수도 있다.On the other hand, although not shown, even when three or more heat insulating layers having different densities are formed in a stack, the reinforcing layer 7 may be formed between at least one of the tank body and the heat insulating layer and between the heat insulating layer and the heat insulating layer. In particular, when three or more heat insulation layers are laminated, all of the reinforcement layers may be formed between heat insulation layers having different densities from each other, or a reinforcement layer may be formed on at least one of them.

본 발명에 따르면, 탱크 몸체(1)의 외부에 단열재를 직접 연속적으로 스프레이하여 독립형 액화가스 탱크에 부착되는 단열층을 일체로 형성할 수 있다. 본 발명의 단열구조에 의하면, 필요에 따라 탱크의 외부에 형성되는 단열층을 몇 개의 구획으로 나누어 형성할 수는 있지만, 종래와 같이 공장 등에서 별도로 제작된 단열패널을 하나씩 탱크 몸체에 부착시킨 후 각각의 단열패널 사이에 단열재를 추가 설치하지 않고, 탱크 몸체의 외부에 대하여 현장에서 직접 단열재를 스프레이하여 단열층을 형성할 수 있기 때문에 종래에 비해 연결부가 없거나 현저히 감소되어 열손실을 더욱 확실하게 방지할 수 있다.According to the present invention, by directly continuously spraying the heat insulating material on the outside of the tank body 1, the heat insulating layer attached to the independent liquefied gas tank can be integrally formed. According to the heat insulation structure of the present invention, the heat insulation layer formed on the outside of the tank can be formed by dividing into several compartments as needed, but after attaching the heat insulation panels separately manufactured at the factory or the like to each tank body one by one, Since no insulation is installed between the insulation panels, the insulation layer can be formed by spraying the insulation directly on the outside of the tank body in the field so that there is no connection or a significant reduction compared to the conventional one, thereby more reliably preventing heat loss. .

본 발명에 따른 독립형 액화가스 탱크의 단열구조는 육상의 독립형 액화가스 탱크뿐만 아니라, 독립형 액화가스 탱크가 설치되어 있으면서 유동이 발생하는 해상에서 부유된 채 사용되는 해양 구조물 중 어디라도 적용될 수 있으며, 다시 말해서 액화천연가스(LNG)나 액화석유가스(LPG) 등을 운반하는 액화가스 운반선이나 LNG RV(LNG Regasification Vessel)와 같은 선박을 비롯하여, LNG FPSO(Floating, Production, Storage and Offloading)나 LNG FSRU(Floating Storage and Regasification Unit)와 같은 해상 플랜트 등에 모두 적용될 수 있다.Insulation structure of the standalone liquefied gas tank according to the present invention can be applied to any of the offshore structures used as floating stand-alone liquefied gas tank, as well as the stand-alone liquefied gas tank is floating in the sea where the flow occurs, again In other words, LNG FPSO (Floating, Production, Storage and Offloading) or LNG FSRU, including liquefied gas carriers carrying LNG, LPG, etc. It can be applied to both offshore plants such as Floating Storage and Regasification Unit.

또한, 본 발명에 따른 단열구조가 적용되어 있는 독립형 액화가스 탱크는, 전술한 바와 같이 액화가스를 수송하기 위한 저장탱크뿐만 아니라, 연료로서 사용될 액화가스를 저장하고 있는 연료탱크일 수 있음은 물론이다.In addition, the independent liquefied gas tank to which the insulation structure according to the present invention is applied may be not only a storage tank for transporting liquefied gas as described above, but also a fuel tank storing liquefied gas to be used as fuel. .

이상과 같이 본 발명에 따른 단열구조를 갖는 독립형 액화가스 탱크를, 예시된 도면을 참조하여 설명하였으나, 본 발명은 이상에서 설명된 실시예와 도면에 의해 한정되지 않으며, 특허청구범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자들에 의해 다양한 수정 및 변형이 이루어질 수 있음은 물론이다.Although the independent liquefied gas tank having a heat insulation structure according to the present invention as described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings described above, the present invention within the claims Of course, various modifications and variations can be made by those skilled in the art.

1: 탱크 몸체, 3: 제1 단열층, 5: 제2 단열층, 7: 보강층, 9: 보호층1: tank body, 3: first insulating layer, 5: second insulating layer, 7: reinforcing layer, 9: protective layer

Claims (13)

액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조로서,
내부에 액화가스를 수용하는 탱크 몸체의 외부 표면에 스프레이되어 형성되는 단열층을 포함하며,
상기 단열층은 동일한 물질로 이루어지되 밀도가 서로 상이한 2개 이상의 단열재가 적층되어 형성되며,
상기 단열층은 밀도가 서로 상이한 2개 이상의 단열재 중 밀도가 상대적으로 높은 단열재일수록 상기 탱크 몸체에 인접하도록 스프레이하여 적층함으로써 형성되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.As a heat insulation structure of a standalone liquefied gas tank for storing liquefied gas,
Insulating layer formed by spraying on the outer surface of the tank body for receiving the liquefied gas therein,
The heat insulation layer is formed of the same material but is formed by stacking two or more heat insulating materials having different densities from each other,
The heat insulation layer is a heat insulating structure of the independent liquefied gas tank, characterized in that formed by spraying and stacking adjacent to the tank body as the heat insulating material having a relatively high density of two or more heat insulating materials having different densities. 삭제delete 청구항 1에 있어서,
상기 단열층의 내부에 매립되어 열 충격 및 상기 탱크 몸체의 열 변형으로 인한 손상을 방지하는 보강층을 더 포함하는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 1,
The insulation structure of the independent liquefied gas tank further comprises a reinforcing layer embedded in the insulation layer to prevent damage due to thermal shock and thermal deformation of the tank body. 청구항 3에 있어서,
상기 보강층은 밀도가 서로 상이한 단열재로 각각 이루어진 2개 이상의 단열층들 사이에 개재되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 3,
The reinforcing layer is a heat insulating structure of the independent liquefied gas tank, characterized in that interposed between two or more insulating layers each made of heat insulating materials having different densities. 청구항 1에 있어서,
상기 단열층의 외부표면 상에는 외부로부터 유입될 수 있는 이물질을 차단하고 기계적 손상을 방지하기 위한 보호층이 스프레이되어 형성되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 1,
The insulating structure of the independent liquefied gas tank, characterized in that the outer surface of the insulating layer is formed by spraying a protective layer to block foreign substances that may be introduced from the outside and prevent mechanical damage. 청구항 1에 있어서,
상기 단열층을 형성하는 단열재는 폴리우레탄 폼인 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 1,
Insulating structure of the independent liquefied gas tank, characterized in that the insulating material forming the insulating layer is polyurethane foam. 청구항 1에 있어서,
상기 단열층은, 밀도가 서로 상이한 2개 이상의 단열재 중 밀도가 상대적으로 높은 단열재일수록 얇은 두께를 가지도록 스프레이하여 적층함으로써 형성되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 1,
The heat insulation layer is a heat insulation structure of the independent liquefied gas tank, characterized in that formed by spraying and stacking to have a thinner thickness of the heat insulating material having a higher density among the two or more heat insulating materials having different densities. 청구항 1에 있어서,
상기 액화가스는 액화천연가스인 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 1,
The liquefied gas is an insulating structure of the independent liquefied gas tank, characterized in that the liquefied natural gas. 청구항 3에 있어서,
상기 보강층은 상기 탱크 몸체와 상기 단열층 사이에 개재되는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.The method according to claim 3,
The reinforcing layer is an insulating structure of the independent liquefied gas tank, characterized in that interposed between the tank body and the insulating layer. 액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조로서,
내부에 액화가스를 수용하는 상기 독립형 액화가스 탱크의 탱크 몸체의 외부 표면에 밀도가 상대적으로 높은 단열재를 스프레이하여 형성하는 제1 단열층과;
상기 제1 단열층을 형성하는 단열재와 동일한 물질로 이루어지되 밀도가 상대적으로 낮은 단열재를 상기 제1 단열층 상에 스프레이하여 형성하는 제2 단열층과;
상기 제1 단열층 및 상기 제2 단열층 사이에 매립되어 열 충격 및 상기 탱크 몸체의 열 변형으로 인한 손상이 하나의 단열층에서 인접한 다른 단열층으로 퍼져나가는 것을 방지하는 보강층과;
상기 단열층의 손상을 방지하고 이물질을 차단하기 위해 상기 제2 단열층 상에 스프레이하여 형성하는 보호층;
을 포함하는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조.As a heat insulation structure of a standalone liquefied gas tank for storing liquefied gas,
A first heat insulating layer formed by spraying a heat insulating material having a relatively high density on the outer surface of the tank body of the independent liquefied gas tank containing the liquefied gas therein;
A second heat insulating layer made of the same material as the heat insulating material forming the first heat insulating layer, and formed by spraying a heat insulating material having a relatively low density on the first heat insulating layer;
A reinforcement layer buried between the first heat insulation layer and the second heat insulation layer to prevent damage caused by thermal shock and thermal deformation of the tank body from spreading from one heat insulation layer to another heat insulation layer;
A protective layer formed by spraying on the second insulating layer to prevent damage to the insulating layer and to block foreign substances;
Insulation structure of a standalone liquefied gas tank comprising a. 액화가스를 저장하기 위한 독립형 액화가스 탱크의 단열구조 형성방법으로서,
내부에 액화가스를 수용하는 탱크 몸체의 외부 표면에 단열재를 스프레이하여 단열층을 형성하며, 상기 단열층은 동일한 물질로 이루어지되 밀도가 서로 상이한 2 이상의 단열재를 각각 순차적으로 스프레이하여 적층함으로써 형성되며, 상기 단열층의 내부에는 보강층이 매립되되,
상대적으로 밀도가 높은 단열재로 이루어진 제1 단열층을 스프레이하여 형성하는 단계와, 상기 제1 단열층 상에 상기 보강층을 형성하는 단계와, 상기 보강층 상에 상대적으로 밀도가 낮은 단열재로 이루어진 제2 단열층을 스프레이하여 형성하는 단계를 포함하는 것을 특징으로 하는 독립형 액화가스 탱크의 단열구조 형성방법.As a method of forming an insulating structure of a standalone liquefied gas tank for storing liquefied gas,
Spraying a heat insulating material on the outer surface of the tank body for accommodating liquefied gas therein to form a heat insulating layer, the heat insulating layer is formed by sequentially spraying and stacking two or more heat insulating materials each made of the same material but different in density, the heat insulating layer Inside the reinforcement layer is buried,
Spraying and forming a first heat insulating layer made of a relatively dense heat insulating material, forming the reinforcing layer on the first heat insulating layer, and spraying a second heat insulating layer made of a relatively low heat insulating material on the reinforcing layer. Insulating structure formation method of a standalone liquefied gas tank comprising the step of forming by. 삭제delete 삭제delete
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