KR-20260064931-A - CRYOGENIC MEDIA DOUBLE VACUUM TANK

KR20260064931AKR 20260064931 AKR20260064931 AKR 20260064931AKR-20260064931-A

Abstract

A cryogenic medium double vacuum tank is disclosed. The cryogenic medium double vacuum tank according to the present embodiment may be provided to include: an inner tank for storing the cryogenic medium; an outer tank surrounding the inner tank, with a vacuum space formed between it and the inner tank; and an air flow guide disposed in the vacuum space to induce air flow during vacuum processing.

Inventors

박태윤
방창선
전상익
조태민
손문호
황재식

Assignees

삼성중공업 주식회사

Dates

Publication Date: 20260508
Application Date: 20241030

Claims (10)

In a double vacuum tank for loading cryogenic media, An inner tank for storing the above-mentioned cryogenic medium; An outer tank surrounding the inner tank and forming a vacuum space between it and the inner tank; and A cryogenic medium double vacuum tank comprising an air flow guide disposed in the above vacuum space to induce air flow during vacuum processing.
In paragraph 1, The above air flow guide is a cryogenic medium double vacuum tank arranged to contact the inner wall of the above outer tank.
In paragraph 2, The above air flow guide is formed along the inner wall of the outer tank and is a cryogenic medium double vacuum tank stacked on the inner wall of the outer tank.
In paragraph 3, The above air flow guide is a cryogenic medium double vacuum tank laminated on the inner wall of the outer tank by chemical adhesion or physical bonding.
In paragraph 3, The above air flow guide is a cryogenic medium double vacuum tank comprising one or more selected from the group consisting of fiber, nylon, polyester, glass fiber and carbon fiber.
In paragraph 1, A cryogenic medium double vacuum tank in which insulation material is placed in the vacuum space above.
In paragraph 6, The above insulation material is a cryogenic medium double vacuum tank in the form of powder or beads.
In Paragraph 7, The above insulation material comprises one or more materials selected from the group consisting of expanded plastic beads, polyurethane, polystyrene, polyethylene, polyisocyanurate, aerogel blanket, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow glass microspheres, forming a cryogenic medium double vacuum tank.
In paragraph 1, A cryogenic medium double vacuum tank further comprising a vacuum pump connected to the outside of the above outer tank to vacuum the vacuum space.
In Paragraph 9, A cryogenic medium double vacuum tank further comprising a filter section disposed at the suction port of the above vacuum pump.

Description

Cryogenic Media Double Vacuum Tank The present invention relates to a cryogenic medium double vacuum tank, and more specifically, to a cryogenic medium double vacuum tank for resolving the problem of increased vacuum processing time caused by air stagnation during vacuum processing. Liquefied gas is a substance that has been converted into a liquid by cooling or compressing a gas; it undergoes a phase change from a gas at room temperature to a liquid for the convenience of transportation and storage. Among liquefied gases, Liquefied Natural Gas (LNG) is one of the widely used and considered important resources. Liquefied Natural Gas refers to a colorless, transparent, ultra-low temperature liquid produced by cooling natural gas, which is primarily composed of methane, to -162 degrees Celsius to reduce its volume to 1/600. As liquefied natural gas (LNG) has recently come to be utilized as an important energy resource, efficient transportation methods capable of transporting large quantities of LNG from production sites to various demand centers have been examined. As part of these efforts, LNG carriers capable of transporting large volumes of LNG by sea have been developed. Liquefied gas transport vessels are equipped with liquefied gas storage tanks capable of withstanding cryogenic temperatures to store liquefied natural gas. Since liquefied natural gas has a vapor pressure higher than atmospheric pressure and an ultra-low boiling point, the liquefied gas storage tanks must be made of materials capable of withstanding cryogenic temperatures and require a unique insulation structure that is resistant to thermal stress and thermal shrinkage and prevents heat intrusion. Storage tanks are classified into independent type and membrane type depending on whether the load of the cargo is directly applied to the insulating structure. Among these, independent storage tanks are adopted and used in various liquefied natural gas transport vessels because they have a relatively simple structure and can stably accommodate liquefied natural gas. Structurally, independent storage tanks are installed in a cargo hold space formed in the hull of a floating offshore structure such as a ship, and a vacuum space is provided between the outer tank of the storage tank and the inner tank of the receiving space. In this case, if a large-sized storage tank is adopted to increase the loading capacity, a problem arises where the vacuuming time required increases significantly due to air stagnation during the vacuuming process in the space between the outer and inner tanks. This problem occurs more severely in the case of large-sized storage tanks. FIG. 1 is a cross-sectional view showing the structure of a double vacuum tank according to one embodiment of the present invention. Figure 2 is a diagram illustrating the problem of air stagnation in the vacuum space during vacuum processing in a conventional double vacuum tank. FIG. 3 is a diagram showing the stacking method of an air flow induction part according to one embodiment of the present invention. FIG. 4 is a diagram showing a stacking method of an air flow induction part according to another embodiment of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are presented to sufficiently convey the concept of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments presented herein and may be embodied in other forms. In order to clarify the present invention, the drawings may omit the illustration of parts unrelated to the description and may slightly exaggerate the size of components to aid understanding. In the present invention, the cryogenic medium is a liquefied gas liquefied by methods such as pressurization and cooling, and includes liquefied natural gas (LNG), liquefied hydrogen (LH2), and liquefied helium. FIG. 1 is a cross-sectional view showing the structure of a double vacuum tank according to one embodiment of the present invention. Referring to FIG. 1, a double vacuum tank (100) according to one embodiment of the present invention is configured to stably load a cryogenic medium contained therein by minimizing the boil-off ratio, and is largely composed of an inner tank (110), an outer tank (120), a vacuum space (130), and an air flow induction section (140). The inner tank (110) is a space in which a cryogenic medium is stored. It is formed in a cylindrical shape and arranged horizontally so that the internal pressure of the cryogenic medium is evenly distributed. Since the cryogenic medium is stored inside the inner tank (110), it is preferable that it be made of a material with excellent cryogenic resistance, such as aluminum, aluminum alloy, SUS (Stainless Steel), PTFE (Polytetrafluoroethylene), or Bakelite. The outer casing (120) is located outside the inner casing