KR20100134173A - Insert materials for insulation of ?radiation - Google Patents

Insert materials for insulation of ?radiation Download PDF

Info

Publication number
KR20100134173A
KR20100134173A KR1020090052663A KR20090052663A KR20100134173A KR 20100134173 A KR20100134173 A KR 20100134173A KR 1020090052663 A KR1020090052663 A KR 1020090052663A KR 20090052663 A KR20090052663 A KR 20090052663A KR 20100134173 A KR20100134173 A KR 20100134173A
Authority
KR
South Korea
Prior art keywords
insulation
gap material
cryogenic
nonwoven fabric
gap
Prior art date
Application number
KR1020090052663A
Other languages
Korean (ko)
Inventor
윤상국
Original Assignee
한국해양대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국해양대학교 산학협력단 filed Critical 한국해양대학교 산학협력단
Priority to KR1020090052663A priority Critical patent/KR20100134173A/en
Publication of KR20100134173A publication Critical patent/KR20100134173A/en

Links

Images

Classifications

    • 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
    • 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
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • 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
    • F17C2203/0345—Fibres
    • F17C2203/035—Glass wool

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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

PURPOSE: An insert material for a radiant heat insulator is provided to improve the heat insulation effect and cut down on the manufacturing cost by employing non-woven fabric instead of glass wool. CONSTITUTION: An insert material, which is provided in a radiant heat insulator of a cryogenic liquid storage tank, is made of non-woven fabric, is made of non-woven fabric less than 60g and aluminum foil having a thickness less than 20 micrometers. The non-woven fabric is bonded on the aluminum foil to form an integrated sheet.

Description

복사열 차단 단열재용 간극재{Insert Materials for Insulation of ㄲRadiation}Insulation Materials for Insulation of ㄲ Radiation

본 발명은 고진공이 적용되는 초저온 액체 저장탱크의 단열재에 관한 것으로, 보다 상세하게는 초저온 상태의 액체를 저장하는 데 사용하는 2중 초저온 탱크 및 각종 초저온 액체 저장용 2중 탱크의 단열재인 종래의 폴리에스터 계통인 Aluminized PET(Polyethylene telephthalate, Dupont 상품명: Aluminized Mylar)와 함께 적용되는 글라스울에 대체하여, 직조되지 않은 섬유(부직포)를 적용함으로써 동일거나 그 이상의 단열특성을 지니고 단열 재료의 가격을 저렴화한 것이다. The present invention relates to a heat insulating material of a cryogenic liquid storage tank to which high vacuum is applied, and more particularly, to a conventional poly insulating material of a double cryogenic tank used for storing a liquid in a cryogenic state and a double tank for storing various cryogenic liquids. Instead of glass wool applied with Asterized PET (Polyethylene telephthalate, Dupont trade name: Aluminized Mylar), which is an ester system, by applying nonwoven fabric (non-woven fabric), it has the same or more insulating properties and lowers the price of the insulating material. will be.

본 발명에 따른 간극재료는 Aluminized PET 박막 필름 단열재에 필요한 간극재인 그라스울 대체용으로, 얇은 PP(Polypropylene), PE(Polyethylene) 등 재료의 직조되지 않은 섬유(부직포)를 적용한 것으로, 이들이 접합되어 하나의 박막 물질로 구성되거나 분리되어 구성되는 것을 특징으로 한다. The gap material according to the present invention is used to replace glass wool, which is a gap material required for aluminized PET thin film insulation, by applying a nonwoven fiber (nonwoven fabric) of a material such as thin PP (Polypropylene), PE (Polyethylene), and they are bonded to one another. It is characterized by consisting of a thin film material or separated.

이 물질에 의하면 초저온 탱크의 외부로부터 유입되는 복사열 차단용 수십겹의 알루미나이즈드 PET의 전도 열전달을 효과적으로 차단하여 함으로써 초저온 유체의 기화량을 크게 줄일 수 있으며, 종래 간극재료인 그라스울과 열차단 효과가 동일하거나 향상되면서도 가격을 크게 감소시킬 수 있는 장점을 지닌다. According to this material, by effectively blocking the conduction heat transfer of dozens of layers of aluminized PET for blocking radiant heat introduced from the outside of the cryogenic tank, the amount of vaporization of the cryogenic fluid can be greatly reduced, and the conventional gap material glass wool and the thermal barrier effect are improved. The same or better, but can significantly reduce the price.

일반적으로 LNG(-162℃), 액체수소(-253℃), 액체질소(-196℃), 액체산소(-183℃), 액체알곤(-186℃)의 초저온 저장탱크는 내외부 탱크 즉 2중 탱크의 구조를 지니고 있다.Generally, cryogenic storage tanks of LNG (-162 ℃), liquid hydrogen (-253 ℃), liquid nitrogen (-196 ℃), liquid oxygen (-183 ℃), and liquid argon (-186 ℃) are internal and external tanks. It has the structure of a tank.

초저온 2중 탱크 내부의 초저온 유체를 장기간 저장하기 위하여는 단열이 필수적으로 필요하며, 단열방법은 크게 3가지 방법으로 구분된다. Insulation is essential for long-term storage of cryogenic fluid in the cryogenic double tank, and the insulation method is largely divided into three methods.

첫번째 방법은 10만톤급의 대형 LNG저장탱크나 LNG운반선박에 적용되는 단열로 폴리우레탄폼(Polyurethane foam) 블록이 적용되며, 열전도도는 0.033 W/m-K가 된다. The first method is a polyurethane foam block with insulation applied to large-scale LNG storage tanks or LNG carriers of 100,000 tons, and the thermal conductivity is 0.033 W / m-K.

두번째 방법은 5~10톤 규모의 액체질소, 액체산소 저장탱크로 펄라이트(Perlite) 분말 진공단열(10-2Torr) 방법으로 열전도도는 0.001 W/m-K이 된다. The second method is perlite powder vacuum thermal insulation (10 -2 Torr) to liquid nitrogen and liquid oxygen storage tanks of 5-10 tons, and the thermal conductivity is 0.001 W / mK.

그리고 세번째로 소형 200~500L급 차량용 LNG저장탱크나 소형 액체산소 탱크 경우 알루미나이즈된 PET 필름 수십겹과 함께, 간극재료로 그라스울 수십겹을 적용하는 방법이다. 이는 10-5Torr의 고진공을 적용하고 있으며, 열전도도는 우레탄의 1/1000인 4.5x10-5 W/m-K가 된다. 본 발명은 이 세번째 단열 방식에 적용되는 간극재료 기술이다. Thirdly, in the case of small 200 ~ 500L class LNG storage tanks or small liquid oxygen tanks, dozens of layers of aluminized PET film are applied together with dozens of glass wool as the gap material. It applies a high vacuum of 10 -5 Torr and the thermal conductivity is 4.5x10 -5 W / mK, which is 1/1000 of urethane. The present invention is a gap material technology applied to this third insulation method.

자연계 열전달은 전도열전달, 대류열전달, 그리고 복사열전달로 이루어진다. 이들 중 전도와 대류 열전달은 물질의 분자를 매질로 하여 전열되며, 10-5Torr과 같 은 고진공이 적용되면 분자가 없어져 전도와 대류 열전달이 발생하지 않게 된다. 반면, 분자가 없는 고진공에서도 온도차의 4승에 비례하는 복사 열전달이 발생한다. 그러므로 고진공을 적용하는 초저온 탱크의 단열을 향상시키기 위하여는 복사열 차단용 물질을 가설하여야 한다. 대표적 실례로 LNG차량용 탱크나 활어차용 액체산소 운반탱크는 이 10-5Torr의 고진공을 적용하며 복사열 차단재로 Aluminized PET, 그리고 간극재로 그라스울을 여러 겹으로 가설하고 있다.Natural heat transfer consists of conduction heat transfer, convective heat transfer, and radiant heat transfer. Among them, conduction and convective heat transfer are conducted by using molecules of the material as a medium, and when a high vacuum such as 10 -5 Torr is applied, the molecules disappear and conduction and convective heat transfer do not occur. On the other hand, even in high vacuum without molecules, radiant heat transfer occurs in proportion to the fourth power of the temperature difference. Therefore, in order to improve the insulation of cryogenic tanks to which high vacuum is applied, radiation shielding materials should be installed. For example, LNG tank tanks or liquid oxygen tanks for live fish cars apply this high vacuum of 10 -5 Torr, and several layers of aluminized PET are used as radiant heat shields and glass wool as a gap material.

탱크 단열에 적용되기 위한 복사열을 차단용 물질의 필수 요건을 보면, 복사열 차단 물질은 방사율(Emissivity)이 매우 커야 하며, 간극재는 열전도도가 적고 두께가 얇아야 한다. PET의 방사율(Emissivity)은 0.5~0.76이며, 알루미늄 박막 필름의 방사율은 고광택제품 경우 0.039~0.057, 일반 제품은 0.09로 매우 적은 값을 갖는다. In view of the essential requirements for shielding radiant heat for tank insulation, the radiant heat shielding material must have a very high emissivity and the gap material must have a low thermal conductivity and a thin thickness. The emissivity of PET is 0.5 ~ 0.76, and the emissivity of aluminum thin film is 0.039 ~ 0.057 for high gloss products and 0.09 for general products.

복사 열전달량은 방사율의 값에 비례하여 전열량이 증가하므로 방사율 값이 적을수록 단열효과가 크게 된다. 그러므로 PET에는 방사율을 증가시키기 위하여 통상 알루미늄을 코팅한 알루미나이즈(Aluminazed)시켜 적용하고 있다. Radiation heat transfer amount increases in proportion to the emissivity value, so the smaller the emissivity value, the larger the insulation effect. Therefore, in order to increase emissivity, PET is usually applied by applying alumina coated with aluminum.

간극재를 설치하여야 하는 필요성은, 복사열 차단재인 알루미나이즈된 PET 필름을 다수 겹 적용하면 알루미나이즈된 PET를 통하여 전도열전달이 발생하게 된다. 이 전도열전달 발생을 차단 위하여 PET와 PET 사이에 간극재가 삽입되며, 적용되는 간극재로는 그라스울(Glass wool), 그라스 섬유(Glass fiber) 등이 있다.The necessity of installing the gap material is that the conductive heat transfer occurs through the aluminized PET when a plurality of aluminized PET films, which are radiant heat shields, are applied. A gap material is inserted between PET and PET to block the occurrence of conduction heat transfer, and glass gap and glass fiber may be used as the gap material.

초저온 탱크의 복사 차단용 단열재 및 간극재 가설 방법은 초저온 액체를 저 장하는 내부 탱크의 외벽에 '간극재-단열필름(PET)-간극재-필름-ㄱ간극재-.....-간극재-필름'의 형태로 수십겹 감아 주게 된다.Insulation and gap material installation method for cryogenic tanks is based on the outer wall of the inner tank that stores the cryogenic liquid 'gap material-insulation film (PET) -gap material-film-a gap material -.....- gap In the form of re-films.

초저온 고진공 탱크의 복사열 차단용 단열재와 함께 적용되는 간극재료인 그라스울은 자체 전열을 막기 위하여 0.1mm이하의 매우 얇은 두께가 요구되나, 국내 생산되지 않고 있으며, 복사열 차단재인 Aluminized PET도 제작공정의 어려움 등으로 전량 수입에 의존하고 있어, 가격이 매우 높은 단점을 가지고 있다.Glass wool, a gap material applied together with the ultra-low temperature vacuum insulating material for heat shielding, requires a very thin thickness of less than 0.1mm to prevent self-heating, but it is not produced in Korea. As it relies on imports, its price is very high.

본 발명의 목적은 이러한 문제점을 해결하기 위하여 창안된 것으로, Aluminized PET와 함께 사용되는 간극재료인 글그라스울이나 글라스 섬유와 동일하거나 그 이상의 얇은 두께를 제공하면서도 단열 성능이 향상되고, 가격이 저렴한 대체 간극재료 물질을 개발하는 데 있다.An object of the present invention is to solve this problem, and provides a thinner thickness of the same or more than glass wool or glass fiber, which is used with aluminized PET, while improving insulation performance and inexpensive replacement gap. It is in developing material materials.

종래 글라스울이나 글라스 섬유와 동일한 간극재 단열효과를 갖는 물질을 개발하기 위하여 직조되지 않은 섬유인 부직포를 적용하였으며, 부직포의 두께에 따라 복사열 차단재의 단열 효과가 변화됨을 발견하여 최적의 두께를 안출하였다. In order to develop a material having the same insulating effect as glass wool or glass fiber, a nonwoven fabric, which is a nonwoven fabric, was applied, and the optimum thickness was found by finding that the thermal insulation effect of the radiation shield was changed according to the thickness of the nonwoven fabric. .

또한, 수입되는 알루미나이즈된 PET 대신에 알루미늄 박막 필름을 부직포와 함께 적용하여 동일 이상의 단열효과를 얻었다. In addition, instead of the imported aluminized PET, an aluminum thin film was applied together with the nonwoven fabric to obtain the same or more insulation effect.

이는 고진공 챔버에 부직포를 포함한 각종 간극재를 알루미늄 박막 필름과 함께 20~50겹 가설하고, 내부통에 저장된 -196℃의 액체질소의 증발량을 비교하여 단열성능을 평가함으로써 단열효과가 동일한 재료를 얻을 수 있었다.This is to construct 20 ~ 50 layers of various gap materials including non-woven fabric in high vacuum chamber together with aluminum thin film, and to evaluate the thermal insulation performance by comparing the evaporation amount of -196 ℃ of liquid nitrogen stored in the inner cylinder to obtain the material with the same thermal insulation effect. Could.

본 발명에 따르면, 알루미늄 박막 필름의 두께가 20μ 이하일 때, 간극재료 인 부직포 질량은 20~60g(길이 1m, 폭 1m당)이 효과적인 단열효과를 제공하였다. 질량의 값이 이 보다 적거나 크면 단열 효과가 감소하였다. 또한, 알루미늄 필름의 두께가 얇을수록 단열성능이 향상된다. According to the present invention, when the thickness of the aluminum thin film is 20μ or less, the mass of the nonwoven fabric, the gap material, 20 ~ 60g (1m in length, per 1m in width) provided an effective thermal insulation effect. If the value of mass is smaller or larger than this, the adiabatic effect is reduced. In addition, as the thickness of the aluminum film is thinner, the heat insulating performance is improved.

본 발명에 따른 초저온 탱크의 복사열 차단용 단열재의 간극재료에 의하면, 간극재인 그라스울 대체용으로 얇은 직조되지 않은 섬유인 부직포를 적용하는 것을 특징으로 하고, 복사열 차단 단열재인 Aluminazed PET (Poly-ethylene terephthalate) 대체용으로 알루미늄(Al) 박막 필름이 적용, 접합되어 하나의 박막 물질로 구성되거나 분리되어 구성되는 것을 특징으로 한다. According to the gap material of the thermal insulation for thermal insulation of the cryogenic tank according to the present invention, the nonwoven fabric, which is a thin non-woven fiber, is used to replace the glass wool, which is a gap material, and the thermal insulation insulation is Aluminazed PET (Poly-ethylene terephthalate). As an alternative, an aluminum (Al) thin film may be applied and bonded to form a single thin film material or to be separated.

이 물질에 의하면 종래의 간극재와 단열재인 그라스울과 알루미나이즈된 PET에 비교하여 열차단 효과는 동일하거나 향상되면서도, 가격을 크게 감소시켜 초저온 탱크의 제작 비용을 크게 절감할 수 있게 된다. According to this material, the thermal barrier effect is the same or improved as compared to the conventional gap material and the glass wool and aluminized PET, which are the same, or improved, and the cost can be greatly reduced, thereby greatly reducing the manufacturing cost of the cryogenic tank.

실 예로 10Ton 탱크 적용 기준으로 소요가격을 비교하면, 간극재와 단열재를 탱크 벽체에 30겹 적용하는 기준으로 전체 소요 길이는 860m가 된다. 종래 단열재와 간극재 1롤(Roll) 규격은 폭 1.57m, 길이 115m로 85만원이며, 총 8롤이 소요되어 680만원이 소요되는 반면, 본 발명에서 개발된 간극재와 단열재료는 폭 1m, 500m에 25만원으로 3Roll이 소요되어 75만원에 불과하여 종래 제품 가격의 11%에 불과하게 된다. For example, if the required price is compared based on the application of the 10Ton tank, the total required length is 860m based on the application of 30 layers of gap material and insulation to the tank wall. Conventional insulation and gap material 1 roll (roll) specification is 1.57m in width, 115m in length is 850,000 won, while a total of 8 rolls takes 6.8 million won, the gap material and insulation material developed in the present invention is 1m in width, It costs 30,000 won for 250,000 won in 500m and is only 750,000 won, which is only 11% of the price of a conventional product.

특히, LNG차량용 연료탱크 등 초저온 유체 저장탱크로 외부로부터 유입되는 복사열을 차단함으로써 초저온 유체의 기화량을 줄여 장기간 저장이 가능할 수 있 게 되어 LNG 이용에 안전성의 제공 및 국가 수입 절감의 효과를 제공한다.In particular, by blocking radiant heat flowing from the outside into cryogenic fluid storage tanks such as fuel tanks for LNG vehicles, it is possible to reduce the amount of vaporization of cryogenic fluids for long-term storage, thereby providing safety for LNG use and reducing national income. .

본 발명에 의하여 고효율 간극재료의 개발과 저렴한 단열재의 보급이 가능하게 됨으로써, 초저온 액체를 저장을 위하여 이중탱크 사이에 진공을 적용하는 200~500L급 LNG차량용 연료탱크, 200L급 활어차용 액체산소탱크 만이 아니라, LNG운송 선박, 육상의 LNG저장탱크, 각종 정치식 초저온 탱크, 초저온 유체를 운반하는 탱크로리, 액체수소용 연료탱크 등 대형탱크에도 널리 적용될 수 있게 된다. 이는 종래의 단열효과를 100~1,000배 증가시키는 것으로 국가적 에너지 절약에 크게 기여하게 된다. The present invention enables the development of high-efficiency gap material and the diffusion of inexpensive insulation, so that only 200-500L LNG fuel tanks and 200L-class liquid oxygen tanks can be applied to vacuum tanks for storing cryogenic liquids. In addition, it can be widely applied to large tanks such as LNG transport vessels, onshore LNG storage tanks, various stationary cryogenic tanks, tank lorry carrying cryogenic fluids, fuel tanks for liquid hydrogen. This increases the conventional insulation effect by 100 to 1,000 times, greatly contributing to the national energy saving.

상기 목적을 달성하기 위하여 본 발명은 LNG차량용 연료탱크나 활어차용 액체산소 탱크 등의 복사열 차단용 Aluminized PET 등과 함께 사용되는 간극재인 그라스울이나 그라스 섬유 등의 대체 물질을 개발하기 위하여 도 1의 장치를 갖추어 단열성능을 측정하였다.In order to achieve the above object, the present invention is equipped with the apparatus of FIG. 1 to develop alternative materials such as glass wool or glass fiber, which is a gap material used with aluminized PET for radiant heat shielding, such as LNG tank fuel tank or live oxygen car liquid oxygen tank. Insulation performance was measured.

도 1의 장치 구성을 보면, 내통(10)과 외통(20) 사이에는 고진공(30)이 적용되며 외부 침입열을 막기 위한 덮게(60)로 이루어진다. 내통의 외벽에는 측정하고자 하는 대체 간극재료(50)와 단열재(50)를 수십겹 감고, 내통(10) 내부에 충전된 액체질소(40)의 시간에 따른 무게 변화로 증발량을 측정한다.Referring to the device configuration of Figure 1, between the inner cylinder 10 and the outer cylinder 20, a high vacuum 30 is applied and consists of a cover 60 to prevent the external invasion heat. Wrap the dozens of alternate gap material 50 and the insulating material 50 to be measured on the outer wall of the inner cylinder, and the amount of evaporation is measured by the weight change of the liquid nitrogen 40 filled in the inner cylinder 10.

도 2는 본 발명의 부직포의 무게별 액체질소 400g이 증발하는 데 소요되는 시간을 보여준다. x축은 부직포 무게이며 y축은 증발시간으로 시잔이 길수록 단열효과가 크게 된다. 도에서 보면, 알루미늄 박막 필름은 두께 20μ 이하를 적용하 고, 간극재로는 길이 1m, 폭 1m당 20~60g 이하 무게의 직조되지 않은 섬유(부직포)가 효과적인 단열 효과를 갖으며, 이 보다 무겁거나 가벼우면(즉, 부직포는 두께가 불규칙하여 두께를 무게로 나타냄) 단열 효과가 감소하게 된다. 이는, 두께가 극히 얇으면 알루미늄 필름과 필름의 전도 열전달이 발생하게 되고 두꺼우면 부직포 자체의 전도열전달이 발생하기 때문이다.Figure 2 shows the time required for evaporation of 400g of liquid nitrogen by weight of the nonwoven fabric of the present invention. The x-axis is the weight of the nonwoven fabric and the y-axis is the evaporation time. As shown in the figure, the aluminum thin film is applied to a thickness of 20μ or less, the nonwoven fabric (nonwoven fabric) of 1m in length, 20 ~ 60g per 1m width as the gap material has an effective heat insulation effect, heavier than this If it is light or light (ie nonwoven is irregular in thickness, the thickness is expressed by weight), the insulation effect is reduced. This is because when the thickness is extremely thin, conduction heat transfer occurs between the aluminum film and the film, and when the thickness is thick, conduction heat transfer occurs between the nonwoven fabric itself.

도 3은 간극재료와 함께 개발된 단열재의 액체질소 증발량을 측정한 결과를 보여준다. x축은 증발량이며 y축은 증발시간으로 기울기가 클수록 단열효과가 크게된다. 도 3에서 보면, 알루미늄 박막 필름은 두께 20μ 이하, 간극재 20~60g 무게의 직조되지 않은 섬유(부직포)가 동일한 단열효과를 갖는 것을 나타낸다. 또한, 알루미늄 박막의 두께가 얇을수록 단열 성능이 향상됨을 알 수 있다.Figure 3 shows the results of measuring the liquid nitrogen evaporation of the insulation material developed with the gap material. The x-axis is the amount of evaporation and the y-axis is the evaporation time. 3, the aluminum thin film shows that the nonwoven fabric (nonwoven fabric) having a thickness of 20 µ or less and a gap material having a weight of 20 to 60 g has the same heat insulating effect. In addition, it can be seen that the thinner the thickness of the aluminum thin film, the better the thermal insulation performance.

그러므로, 고진공이 적용되는 초저온 저장탱크의 단열용 간극재료로는 길이 1m, 폭 1m당 20~60g 이하 무게의 직조되지 않은 섬유(부직포)가 제일 좋은 효과를 제공하며, 복사열 차단용 단열재로는 20μ 이하 두께의 알루미늄 박막 필름이 매우 효과적인 단열효과를 지니게 된다. Therefore, non-woven fiber (nonwoven fabric) of 1m in length and less than 20 ~ 60g per 1m width provides the best effect for the insulation material of cryogenic storage tanks to which high vacuum is applied. Aluminum thin film of the following thickness will have a very effective thermal insulation effect.

기타 간극재료로 종이 등을 비교 실험하였으나 부직포의 단열 간극재 성능이 가장 우수하였다. 부직포는 직조되지 않은 섬유이므로 치밀하지 않고 기공이 많아 알루미늄 박막 필름 사이에 위치하여 전도열전달의 차단효과를 증대시키게 된다. 반면, 종이와 같은 치밀한 물질은 접촉 부위가 커서 전도열전달 양이 증가하게 된다. Although paper and other materials were compared and tested, the insulation gap of nonwoven fabric was the best. Since the nonwoven fabric is a non-woven fiber, it is not dense and there are many pores, which is located between the aluminum thin film to increase the blocking effect of the conduction heat transfer. On the other hand, dense material such as paper has a large contact area, which increases the amount of conductive heat transfer.

본 발명의 간극재료인 부직포의 재질로는 PP(Polypropylene), PE (Poly- ethylene) 등으로 직조되지 않은 섬유는 모두 적용될 수 있다. As the material of the nonwoven fabric which is the gap material of the present invention, any fiber not woven with PP (Polypropylene), PE (Polyethylene) or the like may be applied.

한편, 본 단열재인 알루미늄 박막 필름과 부직포는 각각 분리 적용되거나, 하나로 접착되어 시트(Sheet) 형태로 적용되거나, 초저온 탱크 외부면에 가설을 쉽게 하기 위하여 20~50겹(알루미늄 필름-부직포-필름-부직포-....- 필름-부직포) 형태의 단열재를 하나의 시트 형태로 제작하여 적용하는 것을 포함한다.On the other hand, the aluminum thin film and the nonwoven fabric, which is the heat insulating material, are separately applied, adhered to one sheet, or applied in the form of a sheet, or 20 to 50 ply (aluminum film-non-woven fabric-film-) for easy construction on the outer surface of the cryogenic tank. Non-woven fabric -....- film-non-woven fabric) insulated material in the form of a sheet to apply.

또한, 알루미늄 박막 필름과 간극재의 접촉이 적도록 간극재는 엠보싱이나 절곡이 된 형태가 바람직하게 된다. The gap material is preferably embossed or bent so that there is little contact between the aluminum thin film and the gap material.

이는 다음의 청구범위에서 정의하는 기술사상의 범주인 고진공이 적용되는 초저온 탱크용 간극재료로는 60g 이하의 부직포, 그리고 단열재는 20μ 이하의 알루미늄 박막 필름과 이 원리를 적용한 각종 변형된 형태의 구조들이 포함된다는 것을 밝혀둔다. This is because the gap material for cryogenic tanks to which high vacuum is applied, which is a category of technical idea defined in the following claims, has a nonwoven fabric of 60g or less, and an insulating material of 20μ or less aluminum thin film and various modified forms of structures applying this principle. Note that it is included.

본 발명에 의하여 저렴한 단열 간극재료의 보급이 가능하게 됨으로써 각종 초저온 소, 중, 대형 탱크에 널리 적용이 가능하게 되어, 종래 대형탱크의 단열방식인 우레탄폼이나 펄라이트 분말의 단열성능을 100~1,000배 증가시켜 국가적 에너지 절약에 크게 기여하게 된다.The present invention enables the dissemination of inexpensive insulating gap materials, thereby making it possible to apply widely to various cryogenic small, medium and large tanks, and 100 to 1,000 times the thermal insulation performance of urethane foam or pearlite powder, which is a thermal insulation method of conventional large tanks. This will greatly contribute to national energy savings.

도 1은 간극재료의 단열성능을 비교하기 위한 실험장치 구조도,1 is a structural diagram of an experimental apparatus for comparing the thermal insulation performance of the gap material,

도 2는 본 발명에 따른 간극재료별 액체질소 기화 시간곡선.2 is a liquid nitrogen vaporization time curve for each gap material according to the present invention.

도 3은 간극재와 단열재별 액체질소 기화 시간곡선.3 is a liquid nitrogen vaporization time curve of the gap material and the insulation.

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

10: 내부탱크 20: 외부탱크10: inner tank 20: outer tank

30: 고진공 공간 40: 액체질소30: high vacuum space 40: liquid nitrogen

50: 알루미나즈드 PET 60: 덮게50: aluminized PET 60: cover

Claims (2)

초저온 유체 저장용 탱크의 단열에 있어서 복사열 차단열 단열재 사이에 설치하는 간극재료로 직조되지 않은 섬유를 적용하는 단열 방식.Insulation of cryogenic fluid storage tanks by applying non-woven fibers as a gap material provided between the radiant heat shield heat insulating materials. 상기 1항의 간극재료로 60g 이하의 직조되지 않은 섬유가 20μ 이하 두께의 알루미늄 박막 필름과 함께 적용되는 단열 방식Insulation method in which the nonwoven fabric of 60 g or less as the gap material of claim 1 is applied together with an aluminum thin film having a thickness of 20 μ or less
KR1020090052663A 2009-06-15 2009-06-15 Insert materials for insulation of ?radiation KR20100134173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090052663A KR20100134173A (en) 2009-06-15 2009-06-15 Insert materials for insulation of ?radiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090052663A KR20100134173A (en) 2009-06-15 2009-06-15 Insert materials for insulation of ?radiation

Publications (1)

Publication Number Publication Date
KR20100134173A true KR20100134173A (en) 2010-12-23

Family

ID=43509130

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090052663A KR20100134173A (en) 2009-06-15 2009-06-15 Insert materials for insulation of ?radiation

Country Status (1)

Country Link
KR (1) KR20100134173A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101422911B1 (en) * 2012-05-03 2014-07-23 한국과학기술원 Storage tank including radiation shield installation to suppress boil off gas in lng carriers
WO2017018699A1 (en) * 2015-07-27 2017-02-02 강희자 Cryogenic liquid storage tank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101422911B1 (en) * 2012-05-03 2014-07-23 한국과학기술원 Storage tank including radiation shield installation to suppress boil off gas in lng carriers
WO2017018699A1 (en) * 2015-07-27 2017-02-02 강희자 Cryogenic liquid storage tank

Similar Documents

Publication Publication Date Title
US3018016A (en) Vacuum device
US6485805B1 (en) Multilayer insulation composite
JP6186122B2 (en) Vacuum insulated container for low temperature
CN106170378B (en) The pressure DIFFUSION TREATMENT method of thermal insulation barriers made of foaming synthetic foam
CN103128965B (en) Winding and machining method of heat insulating layer of small volume stationary type vacuum insulation pressure vessel
CN103277630A (en) Multi-layer low-temperature heat insulation structure arranged in density-variable mode
US20150008228A1 (en) Tank container for transport and storage of cryogenic liquefied gases
KR20100134173A (en) Insert materials for insulation of ?radiation
WO2014156703A1 (en) Vacuum heat-insulating material
JP4001184B2 (en) Hot water storage tank
KR101425830B1 (en) Insulation module for liquid cargo tank
KR20170046638A (en) Heat-insulated container and heat insulation structure
JP2009156353A (en) Vacuum insulation material and instrument using the same
CN205746012U (en) A kind of vertical vessel for storing cryogenic fluids
US3357586A (en) Apparatus for conserving and dispensing valuable materials
JP2010127421A (en) Vacuum thermal-insulating material and thermal insulation box
JP6023602B2 (en) Vacuum insulation, insulation box and refrigerator
CN102393076B (en) Water heater adopting vacuum insulation panel to insulate heat and preserve heat
KR20080104801A (en) Insulation structure of lng carrier ship using aerogel
WO2017018699A1 (en) Cryogenic liquid storage tank
Wu et al. Thermal properties of vacuum insulation panels with glass fiber
CN218819619U (en) Heat insulation structure of vehicle-mounted liquid hydrogen bottle
KR101271455B1 (en) Envelope surrounding vaccum insulator panel and vaccum insulator panel
Li et al. Core materials of vacuum insulation panels: a review and beyond
Wu et al. Effect of Envelope Films on Thermal Properties of Vacuum Insulation Panels with Glass Fiber

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
E902 Notification of reason for refusal
E601 Decision to refuse application