KR102640355B1 - Cryogenic compressed gas tank having insulation structure on the neck - Google Patents

Abstract

The present invention provides a cryogenic high-pressure gas container having an insulating structure to increase storage efficiency by installing an insulating structure that can block rapid heat loss at the neck of the container body. According to a preferred embodiment of the present invention, a container body made of a metal liner having a neck with a screw hole formed at the high-pressure gas inlet and outlet, and a container bonded with a carbon glass fiber composite material with a portion of the neck exposed to the outer surface of the container body. It is composed of a body shell layer and a multi-layer insulation layer, and is characterized by a neck insulation cap made of GFRP screwed to the neck to prevent rapid heat loss by covering the externally exposed portion of the neck of the container body.

Description

Cryogenic compressed gas tank having insulation structure on the neck}

The present invention relates to a cryogenic, high-pressure gas container, and in particular, to a cryogenic, high-pressure gas container having an insulating structure that can block rapid heat loss at the neck of the container body to increase storage efficiency.

Cryogenic Compressed Hydrogen (CCH2) is a storage container that can store liquid hydrogen (-253℃) or cryogenic hydrogen gas (-100~-253℃) and can withstand up to 350 bar.

In the case of the existing liquid hydrogen tank, it is a container with a stainless steel double vacuum wall structure and high performance insulation function, and the operating pressure is 15 bar or less. Therefore, when liquid hydrogen is vaporized and the vapor pressure inside the container rises to over 15 bar, the safety valve or relief valve must be operated to discharge the vaporized hydrogen gas. Typically, hydrogen gas emissions begin when the temperature reaches 15 bar or more within a day. Because the CCH2 tank stores extremely low temperatures and has a pressure-resistant structure, the opening of the relief valve is delayed by more than 7 days when storing liquid hydrogen. Cryogenic hydrogen gas, rather than liquid hydrogen, can be stored at high pressure in the CCH2 tank. In this case, theoretically, the storage efficiency reaches 150 to 200% compared to room temperature and high pressure containers. In Europe and the United States, research and development on CCH2 tanks (vessels) have been underway for over 20 years, and certification standards for CCH2 containers have recently been established and preparations are being made for commercialization.

Hydrogen storage tanks with four types of structures are currently proposed. The first type is one in which the entire container is made up of a metal material (steel, aluminum) liner, the second type is a type in which the body is reinforced with a glass (carbon) fiber complex material on a metal material (steel, aluminum) liner, and the third type is a container made of metal (steel, aluminum). Type 4 is a type in which the entire container is reinforced with a carbon (glass) fiber composite material on a metal liner, and the fourth type is a type in which the entire container is reinforced with a carbon (glass) fiber composite material on a non-metal liner such as plastic. Here, in the case of the third type, a structure that additionally surrounds the outside with a high-performance insulating material (e.g., insulating mat, vacuum insulating plate, double vacuum insulating layer, etc.) is being studied.

However, even in the case of the third type studied, there is a limit to increasing storage efficiency because heat loss at the neck where external valves or pipes are connected cannot be blocked even with the existing pressure-resistant structure or multi-layer insulation structure. Therefore, in the CCH2 tank, a method is needed to reinforce the metal liner with composite materials and block heat loss at the neck.

The technology behind the present invention is Korean Patent Registration No. 10-0469636 (Patent Document 1), which proposes 'high-tightness metallic nozzle boss for composite material high-pressure vessel'. This uses seals and fasteners made of elastic material inside the liner to firmly seal the boundary point where the nozzle boss and liner meet, and at the same time, when a composite container using a metallic nozzle boss is used for a long time, the interface between the nozzle boss and the liner is separated. This is to prevent gas leakage. However, this background technology cannot prevent heat loss because the nozzle head of the nozzle boss is exposed to the outside.

Another technology that forms the background of the present invention is Korean Patent Registration No. 10-2432512 (Patent Document 2), which proposes a 'high-pressure gas storage tank with a nozzle boss of a multi-pressure structure'. This prevents deterioration of the airtightness between the nozzle boss and the liner, and prevents the phenomenon of separation of the interface between the nozzle boss and the liner, where repeated torsional loads are applied due to valve attachment and detachment. However, this background technology applies a second pressure coupling member to gradually increase the pressure adhesion between the inner and outer surfaces of the liner in which the nozzle boss is embedded and the nozzle boss. The second pressure coupling member is exposed to the outside, causing heat. Loss cannot be prevented.

Korean Patent Registration No. 10-0469636 Korean Patent Registration No. 10-2432512

The purpose of the present invention is to provide a cryogenic high-pressure gas container having an insulating structure that can block rapid heat loss at the neck of the container body to increase storage efficiency.

According to a preferred embodiment of the present invention, a container body made of a metal liner having a neck with a screw hole formed at the high-pressure gas inlet and outlet, and a container bonded with a carbon glass fiber composite material with a portion of the neck exposed to the outer surface of the container body. The main body is made of an outer skin layer, and a neck insulation cap made of GFRP is screwed to the neck to prevent rapid heat loss by covering the externally exposed part of the neck of the container body, and the inner surface of the neck of the container body is covered with metal even at low temperatures. An energized ring is installed to maintain the sealing function with the high-pressure inflow and outflow tube connected to the cryogenic high-pressure gas container by exerting elasticity, and the section beyond the neck is installed on the outer surface of the high-pressure inflow and outflow tube. Glass containing more than 50 parts by weight of glass fiber. It is characterized in that a composite insulation layer covered with a fiber composite material is formed.

In addition, the neck insulation cap has a cylindrical neck shoulder portion surrounding the exposed outer peripheral surface of the neck, a neck ring plate that is bent and extended from the neck shoulder portion and is in close contact with the tip of the neck, and a neck ring plate that is bent toward the high-pressure gas inlet and outlet to form a male thread on the outer surface. It is characterized by forming a neck fastening part.

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In addition, the multi-layer insulation layer is characterized by being made of one of a super insulation mat, airgel, and vacuum insulation panel.

According to the cryogenic high-pressure gas container having an insulating structure at the neck of the present invention, a neck insulation cap is installed on the neck of the container body to prevent rapid heat loss. In addition, the installation of an energized ring can prevent high-pressure gas leaking between the neck and the high-pressure inlet/outlet tube, and a composite insulation layer covered with a glass fiber composite material is formed on the high-pressure inlet/outlet tube to block heat loss through the transport piping, thereby preventing cryogenic temperatures. Storage efficiency of high-pressure gas is improved.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention along with the detailed description of the invention. Therefore, the present invention is limited to the matters described in the attached drawings. It should not be interpreted as limited.
1 is a perspective view of a cryogenic high-pressure gas container according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of Figure 1.
Figure 3 is a perspective view of the container body applied to Figure 1.
Figure 4 is a cross-sectional view of the neck joint portion of the cryogenic high-pressure gas container of Figure 1.
Figure 5 is a partially cut perspective view of the neck insulation cap applied to Figure 1.

Below, the present invention will be described in detail with reference to embodiments shown in the attached drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

The cryogenic high-pressure gas container 10 according to the present invention is a storage container that can store liquid hydrogen (-253°C) or cryogenic hydrogen gas (-100 to -253°C) and can withstand up to 350 bar.

The cryogenic high-pressure gas container 10 includes a container body 12 made of a metal liner having a neck 121 with a screw hole 121b formed at the high-pressure gas inlet and outlet 121a, as shown in FIGS. 1 to 4, and the container body ( It consists of a container body outer skin layer 14 and a multi-layer insulation layer 15 bonded with a carbon glass fiber composite material with a portion of the neck 121 exposed to the outer surface of 12).

The multi-layer insulation layer 15 may be made of any one of a super insulation mat, airgel, and vacuum insulation panel.

In addition, in order to prevent rapid heat loss by covering the externally exposed portion of the neck 121 of the container body 12, a neck insulation cap 16 made of GFRP (glass fiber composite) is screwed to the neck 121. and installed. At this time, the neck insulation cap 16 is preferably made of GFRP (glass fiber composite) containing more than 50 parts by weight of glass fiber components for high specific strength and specific rigidity.

4 and 5, the neck insulation cap 16 has a cylindrical neck shoulder portion 161 surrounding the exposed outer peripheral surface of the neck portion 121, and is bent and extended from the neck shoulder portion 161 to the tip of the neck portion 121. It consists of a neck ring plate 162 that is in close contact, and a neck fastening portion 163 that is bent from the neck ring plate 162 toward the high-pressure gas inlet and outlet 121a to form a male thread portion 153a on the outer surface.

Therefore, as shown in FIG. 4, the neck insulation cap 16 is coupled to the container body 12 by screwing the neck fastening portion 163 into the screw hole 121b formed in the neck 121 of the container body 12. At this time, the neck insulation cap 16 may be installed by attaching an adhesive that maintains adhesion even in a cryogenic environment to the portion in contact with the neck 121 of the container body 12.

In this way, when the neck insulation cap 16 is coupled and installed to the neck 121 of the container body 12, the neck shoulder portion 161, neck ring plate 162, and neck fastening portion 163 are connected to the neck 121. Not only does it prevent exposure to the outside, but it can also block heat loss from the neck 121 of the container body 12 through its own insulation effect, thereby increasing the storage efficiency of the cryogenic high-pressure gas filled in the cryogenic high-pressure gas container 10. Deterioration can be prevented.

Meanwhile, on the inner surface of the neck 121 of the container body 12, there is an energized ring that exhibits metallic elasticity even at low temperatures and maintains a sealing function with the high-pressure inflow and outflow tube 20 connected to the cryogenic high-pressure gas container 10. ) (18) is preferably installed. The Energized Ring (18) is manufactured by combining a metal spring or O-ring with a Teflon jacket to maintain continuous rebound elasticity even at extremely low temperatures. Therefore, leakage of cryogenic high-pressure gas between the neck 121 of the cryogenic high-pressure gas container 10 and the high-pressure inflow/outlet tube 20 can be prevented by the strong sealing function of the energized ring 18.

At this time, as shown in Figures 2 and 4, a composite insulation layer 201 coated with a glass fiber composite containing more than 50 parts by weight of glass fiber is formed on the outer surface of the high pressure inflow and outflow tube 20 in a section beyond the neck 121. desirable. Of course, if additional insulation is required, an additional insulation layer with a double vacuum wall structure can be attached to the high pressure inflow and outflow tube 20.

In this way, when the composite insulation layer 201 is formed in the high pressure inflow and outflow tube 20, not only the neck 121 of the container body 12 but also the transportation section moving through the high pressure inflow and outflow tube 20 is insulated to maximize heat loss. By suppressing this, the storage efficiency of cryogenic, high-pressure gas can be maximized.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various variations and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by such variations and modifications, but is limited by the claims appended below.

10: Cryogenic high-pressure gas container
121: xylem
121a: High-pressure gas inlet and outlet
121b: screw hole
14: Container body outer layer
15: Multi-layer insulation layer
16: Neck insulation cap
161: Neck shoulder attachment
162: neck ring plate
163: Neck fastening part
18: Energize Drink
20: High pressure inflow and outflow tube
201: Composite insulation layer

Claims (5)

In the cryogenic high-pressure gas container (10),
A container body 12 made of a metal liner having a neck 121 with a screw hole 121b formed at the high-pressure gas inlet/outlet 121a, and a portion of the neck 121 exposed on the outer surface of the container body 12. It consists of a container body outer skin layer (14) and a multi-layer insulation layer (15) bonded with carbon glass fiber composite,
To prevent rapid heat loss by covering the externally exposed portion of the neck 121 of the container body 12, a neck insulation cap 16 made of GFRP (glass fiber composite) is screwed to the neck 121. ,
On the inner surface of the neck 121 of the container body 12, there is an energized ring 18 that exhibits metallic elasticity even at low temperatures and maintains a sealing function with the high pressure inflow and outflow tube 20 connected to the cryogenic high pressure gas container 10. A composite insulation layer (201) is formed on the outer surface of the high-pressure inflow and outflow tube (20), covered with a glass fiber composite material containing more than 50 parts by weight of glass fiber, in a section beyond the neck portion (121). A cryogenic, high-pressure gas container with an insulating structure. According to clause 1,
The neck insulation cap 16 includes a cylindrical neck shoulder portion 161 surrounding the exposed outer peripheral surface of the neck portion 121, and a neck ring plate 162 that is bent and extended from the neck shoulder portion 161 and is in close contact with the tip of the neck portion 121. ), a cryogenic high-pressure gas container with an insulating structure at the neck, characterized in that the neck ring plate 162 is bent toward the high-pressure gas inlet/outlet (121a) to form a neck fastening portion 163 forming a male screw portion on the outer surface. delete According to clause 1,
The multi-layer insulation layer (15) is a cryogenic high-pressure gas container having an insulation structure at the neck, characterized in that it is made of one of a super insulation mat, airgel, and vacuum insulation panel. delete

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