Abstract:
본 발명에 의한 액화천연가스 저장탱크의 접착면 검사방법은, 접착면의 표면에 빛을 조사하는 광조사 단계와, 접착면의 표면에서 반사되는 빛을 감지하는 수광 단계와, 수광 단계에서 감지된 감지신호를 정상신호와 비교하여 그 차이값을 연산하는 판단 단계와, 차이값이 발생하면 알림신호를 발생하는 알림 단계를 포함하는 것을 특징으로 한다. 본 발명에 의하면, 액화천연가스 저장탱크의 구성요소 중에서 접착제에 의해 접착되는 접착면에 대한 오염이나 파손 등의 결함을 표면 반사도를 이용하여 간단하고 손쉽게 검출할 수 있다.
Abstract:
본 발명은 액화천연가스(LNG) 저장시스템의 방벽용 금속판의 시공방법을 개시한다. 본 발명에 따른 방벽용 금속판은 액화천연가스의 저장을 위하여 액화천연가스와 접촉되는 방벽을 구성하며 열변형으로 인한 수축 및 팽창을 흡수하기 위하여 복수의 주름들과 그 계면에 용접에 의한 용접부를 갖는다. 본 발명은 극저온에서 상기 용접부에 작용되는 인장응력을 감쇄시킬 수 있는 압축응력이 상온에서 용접부에 작용되도록 주름들의 양측에 폭 방향으로 조임력을 부여하여 주름들을 변형시키고, 주름들의 폭 방향으로 부여되는 조임력은 용접부의 용접 후 제거한다. 본 발명에 의하면, LNG 운반선의 화물창 등의 방벽용 금속판들의 주름들에 상온에서 압축응력이 작용되도록 주름들을 형성하여 금속판들의 열수축에 의하여 작용되는 인장응력을 상쇄시킴으로써, 용접부 및 단열층의 균열을 방지하여 방벽 구조의 신뢰성을 크게 향상시킬 수 있는 효과가 있다.
Abstract:
PURPOSE: An insulation panel and an LNG(Liquid Natural Gas) storage tank including the same, an insulation panel construction method are provided to maximize thermal insulation by removing the need of fastener holes. CONSTITUTION: An insulation material(33) thermally isolates a storage space. A protective plate(21) is integrally connected to the insulation material and has fastening grooves(22) extended from the side to the inside. A connecting member(25) is fixed to an inner wall by being coupled with the fastening grooves and a bracket fixed to the inner wall. A fastener is positioned in the fastening grooves to fasten the connecting member to the protective plate. The fastening grooves include a deep groove and a shallow groove. A projection(23) is formed between the deep groove and the shallow groove to catch the connecting member.
Abstract:
A foam molding method using electromagnetic wave is provided to manufacture foamed products having low density at high productivity by foam molding polymer resin with electromagnetic wave. Polymer resin mixture having a plurality of air bubbles(4b) is manufactured by mixing liquid polymer resin(4a) and fluid. The polymer resin mixture is supplied to an empty space of a product shape retaining unit. A foamed product(4) is foam-molded by applying electromagnetic wave on the polymer resin mixture. In the step of manufacturing the polymer resin mixture, the fluid is injected into the liquid polymer resin while hardener is mixed with polymer resin.
Abstract:
An LNG storage tank including barrier layer is provided to absorb the amount of deformation of the barrier layer and to transform a part of the end part of the barrier flat board by connecting a plurality of barrier flat boards and the end part of the barrier layer. An LNG storage tank including barrier layer comprises a plurality of barrier boards in which the end part is bent. The bent end part of the barrier board is laminated alternately. The barrier board is the flat board. The barrier board includes a plurality of bent portions in order to reduce the thermal stress in the upper side in the contraction. The barrier board includes a plurality of bent portions and a plurality of bent portions caves.
Abstract:
A storage system for a liquefied natural gas is provided to reduce the residual stress due to the difference in thermal expansion coefficient by forming a second wall of a metal plate. A storage system for a liquefied natural gas includes a first wall(10), a first fly wood(20), a first insulation layer(30), a second wall(40), a second insulation layer(50), and a second fly wood(60). The first wall makes contact with the LNG and stores the LNG. The first fly wood is mounted to the rear surface of the first wall. The first insulation layer has a plurality of unit insulation blocks. The second wall includes a plurality of first metal wall plates(42), a plurality of second metal wall plates(44), and a third metal wall plate(46). The second insulation layer has a plurality of second unit insulation blocks arranged on the rear surface of the second wall. The second fly wood is mounted to the rear surface of the second insulation layer.
Abstract:
본 발명은 화학 플랜트, 담수화 장치, 연료전지, 2차 전지 (레독스 흐름전지), 천연가스 개질기 등 여러 분야의 전기 화학적 반응 효율을 높이기 위해서 사용되는 다공성 전극 및 이를 포함하는 전지 셀에 관한 것이다. 본 발명에 따른 수직 방향 탄소 섬유 층을 구비한 탄소 전극은 탄소 펠트 층과, 상기 탄소 펠트 층 위에 형성되는 수직 방향 탄소 섬유 층을 포함한다. 본 발명에 따른 수직 방향 탄소 섬유 층을 구비한 탄소 전극은 두께 방향으로의 전기전도도가 높으며, 양이온 교환막 및 분리판과의 접촉 저항이 낮다는 장점이 있다.
Abstract:
Disclosed by the present invention is a method for manufacturing a fiber-reinforced composite (FRC) which adheres to the surface of the FRC so that the fiber of fiber felt is exposed. A raw laminated material includes multiple reinforcing fibers and a matrix which is impregnated with the multiple reinforcing fibers in order to fixate the multiple reinforcing fibers. The raw laminated material is consolidated and incompletely hardened by adding a pressure and heat to the raw laminated material. The fiber felt is laminated on the top of the raw laminated material. The raw laminated material is consolidated and completely hardened so that back side of the fiber felt is formed with a binding fiber part which adheres to the matrix and the surface of the fiber felt is formed with an exposure fiber part to which the fiber is exposed by adding a pressure and heat to the raw laminated material and the fiber felt. The raw laminated material is hardened through a hardening cycle comprising: a first temperature rising section which raises the temperature of the matrix; a first fixed temperature section which increases a pressure which is added to the raw laminated material; a second temperature rising section which raises a temperature to the glass transition temperature of the matrix; and a second fixed temperature section which completely hardens the raw laminated material. By the present invention, adhesive properties are improved in case of forming an adhesive joint with another member by adhering to the surface of the FRC so that the fiber of the fiber felt is exposed. Therefore, the present invention is able to improve productivity and cut down the cost of production since a surface treatment is unnecessary. The present invention is also able to be usefully adopted to manufacture the FRC divider plate of a PEMFC or a redox flow battery.