KR-20260065636-A - Independent liquefied gas storage tank

KR20260065636AKR 20260065636 AKR20260065636 AKR 20260065636AKR-20260065636-A

Abstract

An independent liquefied gas storage tank is disclosed, comprising: a tank liner in which a cryogenic fluid is stored; and an external reinforcing jacket installed on the outside of the tank liner, wherein the tank liner is a cylindrical pressure vessel in which a storage space for the cryogenic fluid is formed on the inside, and the external reinforcing jacket is made of a glass fiber reinforced composite material and installed on the outer surface of the cylinder portion excluding the head portion of the tank liner.

Inventors

전준환
박태윤
이양헌
방창선
전상익
조태민
황재식

Assignees

삼성중공업 주식회사

Dates

Publication Date: 20260511
Application Date: 20241030

Claims (13)

A tank liner in which cryogenic fluid is stored; and It includes an external reinforcing jacket installed on the outer side of the tank liner, and The above tank liner is a cylindrical pressure vessel in which a storage space for the cryogenic fluid is formed on the inside, and The above external reinforcing jacket is made of a fiber-reinforced composite material and is installed on the outer surface of the cylinder portion excluding the head portion of the tank liner. Standalone liquefied gas storage tank.
In paragraph 1, The above fiber-reinforced composite material is provided as any one type of fiber-reinforced plastic (FRP), including glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Standalone liquefied gas storage tank.
In paragraph 2, The above external reinforcement jacket is formed by winding continuous filaments of the fiber-reinforced plastic (FRP) onto the outer surface of the tank liner using a filament method. Standalone liquefied gas storage tank.
In paragraph 1, A plurality of stiffeners further comprising a plurality of stiffeners installed at predetermined intervals around the outer perimeter of the above external reinforcing jacket to reinforce the structure, Standalone liquefied gas storage tank.
In paragraph 1, A spray foam insulation layer further comprising the outer side of the entire tank structure including the tank liner and the outer reinforcing jacket, Standalone liquefied gas storage tank.
In paragraph 5, The above spray foam insulation layer is formed by spraying spray foam insulation material onto the outer wall of the entire tank structure and curing it. Standalone liquefied gas storage tank.
In paragraph 6, The above spray foam insulation is characterized by being a foamed polyurethane foam. Standalone liquefied gas storage tank.
In paragraph 1, A further comprising a pair of saddles that support the lower end of the above external reinforcing jacket to support the load, Standalone liquefied gas storage tank.
In paragraph 8, One of the above pair of birds is fixed to the tank liner, and the other is not separately fixed so that the tank liner and the outer reinforcing jacket can slide. Standalone liquefied gas storage tank.
In Paragraph 9, It further includes a tank coaming fixed by welding to the lower outer surface of one side of the tank liner, and The tank coaming is fixedly coupled to one of the pair of saddles, so that even if thermal shrinkage of the tank liner occurs, movement is restricted relative to the point where the tank coaming is located. Standalone liquefied gas storage tank.
In Paragraph 10, In the saddles that are fixed to the tank coaming, a seating groove corresponding to the shape of the tank coaming is formed on the seating surface where the tank coaming is seated. Standalone liquefied gas storage tank.
In Paragraph 11, The above tank coaming is, A first coaming portion that restricts longitudinal movement of the tank liner by making surface contact with the saddles along the longitudinal direction of the above-mentioned independent liquefied gas storage tank, and A second coaming portion that restricts the width-direction movement of the tank liner by making surface contact with the saddles along the width-direction of the above-mentioned independent liquefied gas storage tank, Standalone liquefied gas storage tank.
In paragraph 1, The above cryogenic fluid is liquid hydrogen, Standalone liquefied gas storage tank.

Description

Independent liquefied gas storage tank The present invention relates to a standalone liquefied gas storage tank, and more specifically, to a standalone liquefied gas storage tank that simplifies the structure compared to conventional double-tank structures by adopting a single tank structure, while significantly improving pressure resistance compared to existing tanks by reinforcing the tank shell using fiber reinforced plastic (FRP), such as glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP), and a filament winding method, thereby enabling effective response to evaporated gas generated inside the tank. With the rapid industrialization and population growth leading to a surge in energy demand, fossil fuels are being depleted, creating a need for solutions to environmental issues such as global warming and the supply and demand of alternative energy. To address these complex global energy challenges, hydrogen has recently been garnering attention as a global alternative energy source. Hydrogen is an energy source with the highest energy density per unit mass, existing in abundance on Earth after carbon and nitrogen. It is an eco-friendly energy source that produces only trace amounts of nitrogen oxides during combustion and emits no other harmful substances. Furthermore, since hydrogen can be produced using the abundant water available on Earth and is recycled back into water after use, it can be considered an optimal alternative energy source free from concerns regarding depletion. The most critical challenge in utilizing hydrogen as an energy source is finding a method to store it effectively. Known methods for storing hydrogen include compressing hydrogen gas, liquefying it, and using hydrogen storage alloys. As the hydrogen market grows and large-scale transportation of hydrogen by ship is expected to become active, the method of storing hydrogen by liquefying it, utilizing its characteristic of having a very low density per unit volume, is recognized as a suitable technology for large-scale storage and long-distance transportation. Various technologies can be applied for the storage of liquid hydrogen ( LH2 ). Considering the extremely low storage temperature environment of liquid hydrogen, which has a boiling point of -253°C, tanks for storing liquid hydrogen require strict design conditions. Liquid hydrogen storage tanks must be mechanically robust to withstand cryogenic temperatures and must also be able to withstand shrinkage and expansion stresses due to temperature changes at cryogenic temperatures. Meanwhile, storage technologies using membrane-type tanks and independent-type tanks are known as technologies for storing cryogenic fluids. Independent-type tanks can be further classified into Type C tanks, which are pressure tanks, and Type A and Type B tanks, which are atmospheric tanks. Among them, Type C tanks are typically manufactured in a spherical or cylindrical shape to ensure that the pressure acts equally across the tank's storage cross-sectional area; this structure offers high responsiveness to internal pressure and is widely used for purposes such as onshore storage and land and sea transportation. Conventional Type C tanks are designed to satisfy temperature conditions for storing cryogenic liquid cargoes (LNG, LPG, etc.) by applying insulating materials, such as polyurethane foam (PUF), to the outer surface of the tank steel where the cryogenic fluid is stored. However, since liquefied hydrogen requires extreme temperature conditions 90°C lower than LNG (Liquefied Natural Gas), applying conventional polyurethane foam insulation inevitably leads to an inefficient increase in the thickness of the insulation layer, which inevitably results in space constraints when installed on ships. To compensate for these drawbacks, a Type C tank for liquid hydrogen storage adopting a double vacuum insulation system has been introduced. Figure 1 is a diagram showing the structure of a conventional Type C tank for liquid hydrogen storage. Referring to FIG. 1, a conventional Type C tank for storing liquid hydrogen includes an inner tank (10) in which cryogenic fluid is stored and an outer tank (20) exposed to the outside air, and a space (30) formed between the inner tank (10) and the outer tank (20) is formed as a vacuum, and additionally, a powder-type insulating material is filled into the space (30) to block the inflow of radiant heat, thereby reducing the total amount of external heat inflow. Conventional Type C tanks equipped with such double vacuum insulation systems require significantly advanced technology in terms of engineering, manufacturing methods, and maintenance. From an engineering perspective, 'stability of the support structure' connecting the inner and outer tanks is required, and technical difficulties arise, such as 'optimization of packing material and vacuum level' to reduce heat input and meet the required Boil-Off Rate (BOR). Furthermore, advanced m