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.
Abstract:
본 발명은 케이싱 안에 단열 삽입물이 삽입되고, 케이싱 안이 진공으로 조성되어 단열 성능과 기계적 물성이 향상되는 진공 단열 구조체의 제조방법을 개시한다. 본 발명의 제조방법은 섬유강화 복합재료로 이루어져 있는 케이싱에 기밀의 유지를 위하여 라이닝 실을 제공하고, 케이싱 안에 단열 삽입물을 장착하며, 케이싱 안의 공기를 배출하여 케이싱 안을 진공으로 조성한다. 케이싱 안을 진공으로 조성하는 단계는, 케이싱 안에 드라이아이스를 넣어 드라이아이스가 상온에서 기화되면서 생성되는 이산화탄소에 의하여 공기를 배출함과 동시에 이산화탄소를 케이싱 안에 충전시키고, 이산화탄소의 상변화에 의하여 케이싱 안이 진공으로 조성되도록 케이싱 주위의 온도를 이산화탄소의 액화점 이하로 유지시킨다. 또한, 케이싱 안을 진공으로 조성하는 단계는, 케이싱 안에 액체를 주입하고, 액체를 끓는점 이상으로 가열하여 기체를 생성시키면서 케이싱 안의 공기를 배출함과 동시에 기체를 케이싱 안에 충전시키며, 기체의 상변화에 의하여 케이싱 안이 진공으로 조성되도록 케이싱 주위의 온도를 기체의 액화점 이하로 유지시킨다. 본 발명에 의하면, 섬유강화 복합재료로 이루어지는 케이싱 안에 단열 삽입물이 삽입되어 있고, 케이싱에 라이닝 실이 구비되어 있으며, 케이싱 안이 진공으로 조성되어 단열 성능과 기계적 물성을 향상시키게 된다.
Abstract:
The present invention discloses a method for manufacturing an insulation board used in an extremely low temperature liquid storage system for storing and transferring extremely low temperature liquid such as liquefied natural gas. A method for manufacturing the insulation board of the present invention comprises the steps of: preparing a square box-shaped mold with a cavity having an opened end and disposing a panel on a bottom of the cavity; attaching a sheet material having releasing ability on an inner surface of the cavity, and installing a barrier on the opened end; installing a cover plate for covering the opened end on the barrier and injecting an expanding material between the panel and the barrier to provide insulation foam; making a filling ratio of free foam density to be 0.3 or more with respect to a target density of the insulation foam; expanding the insulation foam, and then post-curing the insulation foam such that the panel, the sheet material, the barrier, and the insulation are cured at the same time; and inserting a reinforcement fiber into the cavity or mixing the expanding material with the reinforcement fiber so as to be inserted into the insulation foam. According to the present invention, the expanding material is injected into the mold to manufacture the insulation board, thereby improving physical characteristics of the insulation board; and the dimensions of the insulation board are correctly manufactured, thereby improving quality. Also, the insulation foam, the barrier, the panel, and a plane material are cured at the same time to simplify a manufacturing process, thereby improve productivity, preventing changes in physical characteristics, and securing a long life cycle.
Abstract:
Disclosed is a joining structure of a cargo hold for a liquefied natural gas (LNG) carrier to join secondary barriers. The cargo hold for an LNG carrier according to the present invention comprises multiple primary barriers; primary insulation layers mounted on the rear surface of the multiple primary barriers; multiple secondary barriers mounted on the rear surface of the primary insulation layers; and secondary insulation layers mounted on the rear surface of the multiple secondary barriers. The joining structure according to the present invention comprises a metal joint strip arranged to cover the interface of the secondary barriers; an adhesive layer formed between the surface of the multiple secondary barriers and the rear surface of the metal joint strip to join the rear surface of the metal joint strip on the surface of the secondary barriers; and welding portions formed by welding the multiple secondary barriers and the metal joint strip. The adhesive layer is formed of a thermosetting polymer adhesive layer separated from the welding portions at a predetermined interval and a thermoplastic polymer adhesive layer formed between the welding portions and the thermosetting polymer adhesive layer. The present invention can prevent peeling and cracks by reducing tensile stress and peel stress since the metal joint strip joined to the boundary of the secondary barriers is joined by the adhesion of an adhesive and welding; thereby improving reliability. Also, the present invention can improve joining quality since the adhesive layer has a uniform thickness.
Abstract:
Disclosed is a vibration isolation structure of a cargo hold for a liquefied natural gas (LNG) carrier capable of absorbing impact to damp vibration. The present invention comprises: a first barrier having one surface with which LNG is in contact, and multiple membranes on which multiple wrinkles are concavely formed to absorb the contraction and the expansion caused by thermal deformation; a first panel mounted on the other surface of the first barrier; and a first insulation layer having multiple first insulation foams arranged on the other surface of the first panel for insulation. A corrugated plate is mounted between the first barrier and the first panel. The corrugation plate comprises: multiple wrinkles formed by absorbing the impact applied through the first barrier to damp the vibration; and combined wrinkles formed on the surface to be fitted in the wrinkles of the membranes. The present invention can increase a vibration isolation performance by absorbing the impact applied to the first barrier using the corrugated plate mounted between the first barrier and the first panel to damp the vibration; thereby increasing the safety of a cargo hold for an LNG carrier. Also, the present invention can have the simple configuration of the corrugated plate and can conveniently construct the corrugated plate.
Abstract:
Disclosed is a cargo hold of a liquefied natural gas (LNG) carrying vessel for storing and carrying the LNG. The present invention comprises a first barrier including a plurality of membranes on which a plurality of wrinkles is formed to be concave to absorb contraction and expansion caused by thermal strain; a first insulation layer including a plurality of first insulation foams which is arranged on the surface of the first barrier; a second barrier installed on the other side of the first insulation layer; a second insulation layer including a plurality of second insulation foams arranged on the other surface of the second barrier for insulation; and a high strength reinforcement layer attached to the surface of the second insulation foams by an adhesive layer to prevent the second insulation foams from being cracked.
Abstract:
Disclosed are a cryogenic liquid storage system and a cargo hold of a liquefied natural gas carrier using the same, which are to store and transport a cryogenic liquid such as liquefied natural gas (LNG). The storage system prepared by the present invention comprises a first barrier which is equipped with membranes where creases are formed concavely in order to absorb shrinking and swelling due to thermal deformation when the surface thereof is in contact with a cryogenic liquid; a shock absorbing layer which is installed on the back surface of the first barrier in order to absorb the load applying to the first barrier; and a first insulation layer which is installed for insulation on the back surface of the shock absorbing layer. The cargo hold of an LNG carrier prepared by the present invention comprises vacuum insulation panels which are arranged for insulation on the back surface of the shock absorbing layer; a second barrier which is installed on the back surface of the vacuum insulation panels; and a second insulation layer which is installed for insulation on the back surface of the second barrier. Through the present invention, damage can be effectively prevented by concavely forming the creases of the membranes comprising the first barrier, in turn, by reducing the occurrence of cavitation due to the sloshing of LNG. In addition, the load of shock transmitted to the first insulation layer from the first barrier can be minimized by installing the shock absorbing layer between the first barrier and the first insulation layer. Thus, reliability at ultralow temperatures can be significantly improved by preventing damage to the first and second insulation layers. Furthermore, the first and second insulation layers are formed as the vacuum insulation panel in order to improve the insulation performance; the quality can be guaranteed by lightening the weight thereof and improving the mechanical properties.