Vacuum insulation system for liquefied gas storage tank

Abstract

The present invention relates to a vacuum insulation system for a liquefied gas storage tank. According to an embodiment of the present invention, the vacuum insulation system for a liquefied gas storage tank comprises: an inner tank in which liquefied gas is stored; and an outer tank surrounding the outside of the inner tank and spaced apart from the inner tank. The vacuum insulation system for a liquefied gas storage tank comprises: multiple vacuum insulation panel structures spaced apart from each other on at least a part of the outer surface of the inner tank to surround at least a part of the outer surface of the inner tank; a first heat transfer blocking member filling gaps formed between the multiple vacuum insulation panel structures to block heat transfer; a second heat transfer blocking member disposed between the inner tank and the vacuum insulation panel structures to block heat transfer; and a vacuum-forming member selectively connected to a separation space formed between the inner tank and the outer tank to depressurize the separation space, thereby forming a vacuum between the inner tank and the outer tank.

Description

Vacuum insulation system for liquefied gas storage tanks

[0001] The present invention relates to a vacuum insulation system for a liquefied gas storage tank.

[0002] Liquefied natural gas (LNG), an example of liquefied gas, is a colorless, transparent, ultra-low-temperature liquid made by cooling natural gas, mainly methane, to an extremely low temperature of -162°C, reducing its volume to 1 / 600th.

[0003] To utilize this cryogenically low-temperature liquefied natural gas as energy, efficient transportation methods capable of transporting large quantities of liquefied natural gas from production sites to demand centers have been explored. As part of these efforts, liquefied natural gas transport vessels capable of transporting large quantities of liquefied natural gas by sea have been developed.

[0004] At this time, liquefied natural gas (LNG) transport vessels must be equipped with storage tanks capable of storing LNG liquefied at cryogenic temperatures. These storage tanks may consist of an inner tank and an outer tank surrounding the inner tank. To ensure superior insulation performance, the storage tanks may be equipped with a vacuum insulation system.

[0005] Meanwhile, a storage tank with a vacuum insulation system can block heat transfer by convection and conduction by maintaining the space between the inner and outer tanks in a vacuum state at a certain level, or can block heat transfer by convection by filling the space between the inner and outer tanks with a material having low thermal conductivity, and can also block heat transfer by radiation by placing a material with excellent reflectivity in the space between the inner and outer tanks.

[0006] However, conventional vacuum insulation systems have the problem that they cannot secure excellent insulation performance because they require a lot of time and cost to form a vacuum in the space between the inner and outer tanks when the size of the storage tank increases, and there is a limit to maintaining the vacuum level between the inner and outer tanks.

[0007] Therefore, there is a need for technological development for a vacuum insulation system for liquefied gas storage tanks that can secure superior insulation performance in less time and cost than before, even as storage tanks become larger.

[0008] Embodiments of the present invention have been devised to solve the above-described conventional problems, and to provide a vacuum insulation system for a liquefied gas storage tank, which enables vacuumization in less time and cost than conventional methods by means of a plurality of vacuum insulation panel structures that individually manage the vacuum level even when the storage tank is enlarged, thereby ensuring excellent insulation performance.

[0009] In addition, the present invention seeks to provide a vacuum insulation system for a liquefied gas storage tank that is convenient for installation and maintenance, as multiple vacuum insulation panel structures can be flexibly applied to the size and shape of the storage tank and are individually managed.

[0010] In addition, the present invention aims to provide a vacuum insulation system for a liquefied gas storage tank, which can maintain a lower vacuum level than before, thereby lowering thermal conductivity and improving insulation performance.

[0011] In addition, the present invention seeks to provide a vacuum insulation system for a liquefied gas storage tank that is more economical as the generation of evaporated gas in the storage tank is reduced due to superior insulation performance compared to conventional systems.

[0012] According to one aspect of the present invention, a vacuum insulation system for a liquefied gas storage tank including an inner tank in which liquefied gas is stored and an outer tank that surrounds the outside of the inner tank and is spaced apart from the inner tank may be provided, the vacuum insulation system for a liquefied gas storage tank including: a plurality of vacuum insulation panel structures that are spaced apart from each other on at least a portion of an outer surface of the inner tank and are provided to surround at least a portion of an outer surface of the inner tank; a first heat transfer blocking member that fills a gap formed between the plurality of vacuum insulation panel structures to block heat transfer; a second heat transfer blocking member that is disposed between the inner tank and the vacuum insulation panel structures to block heat transfer; and a vacuum forming member that is selectively connected to a space formed between the inner tank and the outer tank and depressurizes the space, thereby forming a vacuum between the inner tank and the outer tank.

[0013] In addition, the vacuum insulation panel structure may include a case in which a connecting means provided in the inner tank is connected through a penetration connection and a receiving space is formed inside, and at least a portion of the circumference of the case connected to the inner tank may be provided to be deformable corresponding to the shape of the outer surface of the inner tank.

[0014] In addition, the vacuum insulation panel structure further includes a first vacuum insulation material that is accommodated in the accommodation space of the case and forms a vacuum in the accommodation space to provide insulation performance, and the first vacuum insulation material can be arranged closer to the inner tank than to the outer tank.

[0015] In addition, the vacuum insulation panel structure may include a partition member that is connected to the interior of the case and partitions the receiving space of the case into a first insulation space and a second insulation space.

[0016] In addition, the vacuum insulation panel structure may further include a first vacuum insulation material that is accommodated in the first insulation space of the case and forms a vacuum in the first insulation space to provide insulation performance; and a second vacuum insulation material that is accommodated in the second insulation space of the case and forms a vacuum in the second insulation space to provide insulation performance.

[0017] In addition, the first insulation space is arranged adjacent to one of the inner tank and the outer tank, the second insulation space is arranged adjacent to the other of the inner tank and the outer tank, and the first vacuum insulation material and the second vacuum insulation material may be provided to have different insulation performances depending on the temperature range.

[0018] In addition, the vacuum insulation panel structure may further include a first vacuum insulation material that is accommodated in the first insulation space of the case and forms a vacuum in the first insulation space to provide insulation performance; and a normal pressure insulation material or a reduced pressure insulation material that is accommodated in the second insulation space of the case and provides insulation performance to the second insulation space.

[0019] In addition, the first insulation space is arranged adjacent to one of the inner tank and the outer tank, the second insulation space is arranged adjacent to the other of the inner tank and the outer tank, and the first vacuum insulation material may be provided to have different insulation performance from the normal pressure insulation material or the pressure-reducing insulation material.

[0020] According to embodiments of the present invention, even if the storage tank is enlarged, it is possible to vacuumize it in less time and at less cost than before by using a plurality of vacuum insulation panel structures that individually manage the vacuum level, thereby securing excellent insulation performance.

[0021] In addition, since multiple vacuum insulation panel structures can be flexibly applied to the size and shape of the storage tank and are individually managed, there is the effect of convenience in installation and maintenance.

[0022] Additionally, since a lower vacuum level can be maintained compared to conventional methods, the thermal conductivity can be lowered, which has the effect of improving insulation performance.

[0023] In addition, it has the effect of increasing economic efficiency as the generation of evaporated gas in the storage tank is reduced due to superior insulation performance compared to conventional methods.

[0024] In addition, in the past, it was difficult to apply multi-layer insulation used to block radiant heat when the storage tank was enlarged, but according to this embodiment, the outer covering of the vacuum insulation panel is formed of a material excellent in blocking radiant heat, so that better insulation performance can be secured in the second insulation space arranged adjacent to the outer tank than the inner tank.

[0025] FIG. 1 is a perspective view illustrating a liquefied gas storage tank to which a vacuum insulation system according to one embodiment of the present invention is applied.

[0026] Figure 2 is a cross-sectional view taken along the “AA” line of Figure 1.

[0027] FIG. 3 is a perspective view showing an example of a plurality of vacuum insulation panel structures of the vacuum insulation system of the liquefied gas storage tank of FIG. 1.

[0028] Figure 4 is a front view of Figure 3.

[0029] Fig. 5 is a front view showing an example of a vacuum insulation panel structure of a vacuum insulation system of a liquefied gas storage tank of Fig. 1.

[0030] Fig. 6 is a front view showing another example of a vacuum insulation panel structure of the vacuum insulation system of the liquefied gas storage tank of Fig. 1.

[0031] Fig. 7 is a front view showing another example of a vacuum insulation panel structure of the vacuum insulation system of the liquefied gas storage tank of Fig. 1.

[0032] Hereinafter, specific embodiments for implementing the idea of ​​the present invention will be described in detail with reference to the drawings.

[0033] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0034] Additionally, when it is said that a component is 'coupled' or 'connected' to another component, it should be understood that it may be directly coupled or connected to that other component, but there may also be other components in between.

[0035] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0036] Furthermore, the expressions "one side," "the other side," "upper side," and "lower side" in this specification are based on the drawings and may be expressed differently if the orientation of the object changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the size of each component does not fully reflect the actual size.

[0037] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0038] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of any other particular characteristic, region, integer, step, operation, element, component and / or group.

[0039] Hereinafter, a specific configuration of a vacuum insulation system for a liquefied gas storage tank according to one embodiment of the present invention will be described with reference to the drawings.

[0040] FIG. 1 is a perspective view illustrating a liquefied gas storage tank to which a vacuum insulation system according to one embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along the line “AA” of FIG. 1, FIG. 3 is a perspective view illustrating an example of a plurality of vacuum insulation panel structures of the vacuum insulation system of the liquefied gas storage tank of FIG. 1, FIG. 4 is a front view of FIG. 3, and FIG. 5 is a front view illustrating an example of a vacuum insulation panel structure of the vacuum insulation system of the liquefied gas storage tank of FIG. 1.

[0041] Referring to FIGS. 1 to 5, a vacuum insulation system (1) of a liquefied gas storage tank according to one embodiment of the present invention may include a plurality of vacuum insulation panel structures (10), a first heat transfer blocking member (20), a second heat transfer blocking member (30), and a vacuum forming member (40).

[0042] First, a brief description will be given of a liquefied gas storage tank (100) to which a vacuum insulation system (1) is applied. The liquefied gas storage tank (100) may include an inner tank (110) and an outer tank (120).

[0043] The inner tank (110) may have a space for accommodating liquefied gas, and the outer tank (120) may be provided to surround the outside of the inner tank (110) in which the liquefied gas is accommodating and to be spaced apart from the inner tank (110).

[0044] The outer shell (120) may have an internal shape corresponding to the external shape of the inner shell (110), thereby forming a separation space between the outer surface of the inner shell (110) and the inner surface of the outer shell (120). The outer shell (120) may be supported from the ground by saddles (130).

[0045] A plurality of vacuum insulation panel structures (10) may be arranged in the space formed between the inner tank (110) and the outer tank (120). A plurality of vacuum insulation panel structures (10) that are vacuum-treated themselves may be arranged in this space, and the space in which the plurality of vacuum insulation panel structures (10) are arranged may also be vacuumized through a vacuum forming member (40). This will be described later.

[0046] A plurality of vacuum insulation panel structures (10) can individually maintain a vacuum level in the space formed between the inner shell (110) and the outer shell (120), thereby significantly reducing the time it takes for the insulation system (1) to reach a vacuum state.

[0047] To this end, a plurality of vacuum insulation panel structures (10) may be arranged spaced apart from each other on at least a portion of the outer surface of the inner tank (110) so as to surround at least a portion of the outer surface of the inner tank (110). As the plurality of vacuum insulation panel structures (10) individually maintain a vacuum degree, structural stability can be secured even when the inner tank (110) is deformed due to thermal shrinkage / expansion. In addition, when a problem occurs in some of the plurality of vacuum insulation panel structures (10), convenience can be improved by separating and maintaining only the vacuum insulation panel structure (10) in which the problem occurred.

[0048] These plurality of vacuum insulation panel structures (10) may be spaced apart from each other at a predetermined interval in consideration of deformation due to thermal contraction / expansion of the inner shell (110). For example, a gap (G1) between vacuum insulation panel structures (10) adjacently arranged along the longitudinal direction of the inner shell (110) among the plurality of vacuum insulation panel structures (10) may be substantially the same as a gap (G2) between vacuum insulation panel structures (10) arranged along the circumferential direction of the inner shell (110) among the plurality of vacuum insulation panel structures (10).

[0049] At this time, the vacuum insulation panel structure (10) may include a case (11) and a first vacuum insulation material (12).

[0050] The case (11) can be placed on the second heat transfer blocking member (30) and fixed to the inner tank (110). To this end, a coupling means (not shown) provided in the inner tank (110) can be penetratedly coupled to the case (11), and a receiving space (111) can be formed inside the case (11). A first vacuum insulation material (12) can be accommodated in the receiving space (111).

[0051] Meanwhile, at least a portion of the circumferential surface of the case (11) coupled to the inner tank (110) may be provided to be deformable to correspond to the shape of the outer surface of the inner tank (110). Accordingly, even if the outer surface of the inner tank (110) is formed as a curved surface, the case (11) can be easily attached and constructed on the outer surface of the inner tank (110). Accordingly, the vacuum insulation panel structure (10) can be installed without restriction in various types of liquefied gas storage tanks (100), such as independent tanks, integrated storage tanks, and spherical storage tanks.

[0052] The case (11) can be made of a synthetic resin material that has stable thermal conductivity and excellent tensile strength at extremely low temperatures and little deformation even under rapid temperature changes. For example, the case (11) can be made of a material such as glass fabric / epoxy laminate, fiber glass epoxy, glass epoxy laminate, glass-reinforced epoxy, glass cloth / epoxy resin, etc. When the case (11) is formed of a synthetic resin material of the above-described material, a predetermined strength and stiffness can be secured, and since deformation due to shrinkage / expansion due to heat is little, it can be suitably applied to a vacuum insulation system (1) of a liquefied gas storage tank in which a large temperature difference occurs.

[0053] Meanwhile, since the plurality of vacuum insulation panel structures (10) are spaced apart from each other at a predetermined interval, the influence on thermal contraction / expansion of the inner tank (110) can be minimized, but the gaps (G1, G2) formed between the plurality of vacuum insulation panel structures (10) can cause heat transfer by convection. However, in the present embodiment, since the first heat transfer blocking member (20) is filled in the gaps (G1, G2) formed between the plurality of vacuum insulation panel structures (10), heat transfer by convection can be blocked. This will be described later.

[0054] The first vacuum insulation material (12) can be accommodated in the accommodation space (111) of the case (11), and can provide insulation performance by forming a vacuum in the accommodation space (111). For example, the first vacuum insulation material (12) can have a structure in which a core such as glass wool, fumed silica, perlite, or aerogel from which air has been removed is filled inside a covering material having high shielding properties, including a metal film such as aluminum foil or a polymer film. By means of the first vacuum insulation material (12), the vacuum insulation panel structure (10) can maintain a vacuum degree of about 0.01 millitorr to about 10 millitorr.

[0055] The vacuum insulation panel structure (10) in which the interior of the case (11) is vacuum-treated and becomes a vacuum state while the first vacuum insulation material (12) is accommodated in the accommodation space (111) of the case (11), can be joined to at least a portion of the outer surface of the inner shell (110) and wrap at least a portion of the outer surface of the inner shell (110).

[0056] The first heat transfer blocking member (20) is filled in the gaps (G1, G2) formed between a plurality of vacuum insulation panel structures (10) to suppress the movement of molecules of a rarefied gas, thereby blocking heat transfer. For example, the first heat transfer blocking member (20) may be provided as a glass bubble.

[0057] In addition, since the first heat transfer blocking member (20) is provided to surround the outside of the vacuum insulation panel structure (10), the inflow of rarefied gas into the vacuum insulation panel structure (10) can be more reliably blocked, and damage to the vacuum insulation panel structure (10) due to pressure applied from the outside can be suppressed. Furthermore, since the deterioration of the insulation performance of the vacuum insulation panel structure (10) can be prevented in advance, the insulation performance of the vacuum insulation panel structure (10) can be maintained for a long period of time.

[0058] The second heat transfer blocking member (30) can minimize heat radiation that may affect the inner casing (110). To this end, the second heat transfer blocking member (30) can be placed between the inner casing (110) and the vacuum insulation panel structure (10).

[0059] Meanwhile, the second heat transfer blocking member (30) may also play a role in protecting the lower part of the vacuum insulation panel structure (10). When the second heat transfer blocking member (30) is placed between the inner shell (110) and the vacuum insulation panel structure (10), fatigue cracks and wear damage of the vacuum insulation panel structure (10) can be minimized even if thermal shrinkage / expansion of the inner shell (110) occurs repeatedly.

[0060] The second heat transfer blocking member (30) may be arranged to surround at least a portion of the outer surface of the inner tank (110), and a plurality of vacuum insulation panel structures (10) may be arranged on the second heat transfer blocking member (30).

[0061] The second heat transfer blocking member (30) may be provided, for example, with multi-layer insulation (MLI) having a predetermined reflectivity. By refracting radiant energy in the opposite direction to the surface through which it is transmitted by the second heat transfer blocking member (30), heat transfer by radiation can be blocked.

[0062] The vacuum forming member (40) can block heat transfer by convection and conduction by forming a vacuum between the inner tank (110) and the outer tank (120) by depressurizing the space formed between the inner tank (110) and the outer tank (120).

[0063] To this end, the vacuum forming member (40) is connected to a pipeline (not shown) that is provided to communicate with the space between the inner tank (110) and the outer tank (120), and may be provided as a pressure reducing device that sucks in the gas inside the space to reduce the pressure inside the space. For example, the vacuum forming member (40) may be provided as a low vacuum primary pump such as a rotary or Roots pump, or a high vacuum secondary pump such as an oil diffusion or turbo cryomolecular pump.

[0064] Meanwhile, since a plurality of vacuum insulation panel structures (10) are arranged in the space formed between the inner tank (110) and the outer tank (120) to maintain individual vacuum levels, the time required to evacuate the space can be significantly shortened compared to a case where a plurality of vacuum insulation panel structures (10) are not arranged in the space. By means of this vacuum forming member (40), the vacuum insulation panel structure (10) can maintain a vacuum level of about 100 millitorr or less.

[0065] The vacuum insulation system (1) of a liquefied gas storage tank having the configuration described above has the effect of enabling vacuumization in less time and cost than conventional methods by means of multiple vacuum insulation panel structures (10) that manage the vacuum level, thereby ensuring excellent insulation performance.

[0066] In addition, since a plurality of vacuum insulation panel structures (10) can be flexibly applied to the size and shape of the liquefied gas storage tank (100) and are individually managed, there is an effect of convenient installation and maintenance.

[0067] Additionally, since a lower vacuum level can be maintained compared to conventional methods, the thermal conductivity can be lowered, which has the effect of improving insulation performance.

[0068] In addition, there is an effect of increasing economic efficiency as the generation of evaporated gas in the liquefied gas storage tank (100) is reduced due to superior insulation performance compared to conventional ones.

[0069] Hereinafter, another example of a vacuum insulation panel structure of a vacuum insulation system for a liquefied gas storage tank according to one embodiment of the present invention will be described with reference to FIG. 6.

[0070] Fig. 6 is a front view showing another example of a vacuum insulation panel structure of the vacuum insulation system of the liquefied gas storage tank of Fig. 1.

[0071] Referring to FIG. 6, the vacuum insulation panel structure (10a) may include a case (11a), a partition member (13), a first vacuum insulation material (14), and a second vacuum insulation material (15).

[0072] The case (11a) may be made of a synthetic resin material such as glass fabric / epoxy laminate, fiberglass epoxy, glass epoxy laminate, reinforced glass epoxy, glass cloth / epoxy resin, etc.

[0073] The partition member (13) can be connected to the interior of the case (11a) to partition the receiving space of the case (11a) into a first insulating space (112) and a second insulating space (113). For example, the partition member (13) can be formed of substantially the same material as the case (11a).

[0074] The first insulating space (112) and the second insulating space (113) may be arranged to face each other with the partition member (13) therebetween. For example, one of the first insulating space (112) and the second insulating space (113) may be provided on the inner side of the partition member (13), and the other of the first insulating space (112) and the second insulating space (113) may be provided on the outer side of the partition member (13). Here, the inner side of the partition member (13) means the direction from the inner surface of the outer tank (120) toward the outer surface of the inner tank (110), and the outer side of the partition member (13) means the direction from the outer surface of the inner tank (110) toward the inner surface of the outer tank (120).

[0075] The first insulating space (112) may be arranged adjacent to either the inner tank (110) or the outer tank (120), and the second insulating space (113) may be arranged adjacent to the other of the inner tank (110) and the outer tank (120). For convenience of explanation, the following description will be given as an example a case in which the first insulating space (112) is arranged closer to the inner tank (110) than to the outer tank (120), and the second insulating space (113) is arranged closer to the outer tank (120) than to the inner tank (110).

[0076] The first vacuum insulation material (14) is an insulation material placed in the first insulation space (112) that is positioned closer to the inner tank (110) than the outer tank (120), and may be provided as an insulation material that has a predetermined insulation performance and can vacuumize the first insulation space (112).

[0077] The second vacuum insulation material (15) is an insulation material placed in the second insulation space (113) that is placed closer to the outer tank (120) than the inner tank (110), and may be provided as an insulation material that can evacuate the second insulation space (113) while having an insulation performance lower than that of the first vacuum insulation material (14).

[0078] Hereinafter, another example of a vacuum insulation panel structure of a vacuum insulation system for a liquefied gas storage tank according to one embodiment of the present invention will be described with reference to FIG. 7.

[0079] Fig. 7 is a front view showing another example of a vacuum insulation panel structure of the vacuum insulation system of the liquefied gas storage tank of Fig. 1.

[0080] Referring to FIG. 7, the vacuum insulation panel structure (10b) may include a case (11a), a partition member (13), a first vacuum insulation material (14), and a normal pressure insulation material (16).

[0081] The case (11a) may be made of a synthetic resin material such as glass fabric / epoxy laminate, fiberglass epoxy, glass epoxy laminate, reinforced glass epoxy, glass cloth / epoxy resin, etc.

[0082] The partition member (13) can be connected to the interior of the case (11a) to partition the receiving space of the case (11a) into a first insulating space (112) and a second insulating space (113). For example, the partition member (13) can be formed of substantially the same material as the case (11a).

[0083] The first insulating space (112) and the second insulating space (113) may be arranged to face each other with the partition member (13) therebetween. For example, one of the first insulating space (112) and the second insulating space (113) may be provided on the inner side of the partition member (13), and the other of the first insulating space (112) and the second insulating space (113) may be provided on the outer side of the partition member (13). Here, the inner side of the partition member (13) means the direction from the inner surface of the outer tank (120) toward the outer surface of the inner tank (110), and the outer side of the partition member (13) means the direction from the outer surface of the inner tank (110) toward the inner surface of the outer tank (120).

[0084] The first vacuum insulation material (14) is an insulation material placed in the first insulation space (112) that is positioned closer to the inner tank (110) than the outer tank (120), and may be provided as an insulation material that has a predetermined insulation performance and can vacuumize the first insulation space (112).

[0085] The atmospheric pressure insulation material (16) is an insulation material placed in the second insulation space (113) that is placed closer to the outer tank (120) than the inner tank (110), and may be provided as an insulation material that has an insulation performance lower than that of the first vacuum insulation material (14) and can exhibit insulation performance at atmospheric pressure without vacuuming the second insulation space (113).

[0086] The atmospheric pressure insulation (16) may be provided, for example, with polyurethane foam. The atmospheric pressure insulation (16) may be designed to reduce the gap between the inner tank (110) and the outer tank (120) to reduce the occurrence of cold spots due to rapid temperature differences with the outside and to ensure structural safety.

[0087] Meanwhile, in this embodiment, a case in which a normal pressure insulation material (16) is provided in the second insulation space (113) is described as an example, but this is merely an example and the spirit of the present invention is not limited thereby. In addition to the normal pressure insulation material (16), a pressure-reducing insulation material such as vacuumized perlite or glass bubble may also be provided in the second insulation space (113).

[0088] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed as having the broadest scope in accordance with the basic idea disclosed in this specification. Those skilled in the art may implement patterns of shapes not specified by combining / substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. In a vacuum insulation system of a liquefied gas storage tank, which includes an inner tank in which liquefied gas is stored and an outer tank that surrounds the outside of the inner tank and is spaced apart from the inner tank, A plurality of vacuum insulation panel structures arranged at a distance from each other on at least a portion of the outer surface of the inner tank and provided to surround at least a portion of the outer surface of the inner tank; A first heat transfer blocking member that is filled in the gap formed between the plurality of vacuum insulation panel structures to block heat transfer; A second heat transfer blocking member arranged between the inner wall and the vacuum insulation panel structure to block heat transfer; and A vacuum forming member is included that is selectively connected to a space formed between the inner and outer tanks and depressurizes the space, thereby forming a vacuum between the inner and outer tanks. Vacuum insulation system for liquefied gas storage tanks.

2. In paragraph 1, The above vacuum insulation panel structure is, The coupling means provided in the above inner part is connected through a case and a receiving space is formed inside, At least a portion of the circumference of the case coupled to the inner surface is provided to be deformable corresponding to the shape of the outer surface of the inner surface. Vacuum insulation system for liquefied gas storage tanks.

3. In paragraph 2, The above vacuum insulation panel structure is, The case further includes a first vacuum insulating material that is accommodated in the accommodation space and forms a vacuum in the accommodation space to provide insulation performance. The above first vacuum insulation material is placed closer to the inner tank than the outer tank. Vacuum insulation system for liquefied gas storage tanks.

4. In paragraph 2, The above vacuum insulation panel structure is, A partition member connected to the inside of the case and dividing the receiving space of the case into a first insulating space and a second insulating space, Vacuum insulation system for liquefied gas storage tanks.

5. In paragraph 4, The above vacuum insulation panel structure is, A first vacuum insulating material that is accommodated in the first insulating space of the case and forms a vacuum in the first insulating space to provide insulating performance; and Further comprising a second vacuum insulating material that is accommodated in the second insulating space of the case and forms a vacuum in the second insulating space to provide insulating performance. Vacuum insulation system for liquefied gas storage tanks.

6. In paragraph 5, The first insulating space is arranged adjacent to one of the inner and outer tanks, and the second insulating space is arranged adjacent to the other of the inner and outer tanks. The first vacuum insulation material and the second vacuum insulation material are provided to have different insulation performances depending on the temperature range. Vacuum insulation system for liquefied gas storage tanks.

7. In paragraph 4, The above vacuum insulation panel structure is, A first vacuum insulating material that is accommodated in the first insulating space of the case and forms a vacuum in the first insulating space to provide insulating performance; and Further comprising a normal pressure insulation material or a pressure reducing insulation material that is accommodated in the second insulation space of the case and provides insulation performance to the second insulation space. Vacuum insulation system for liquefied gas storage tanks.

8. In paragraph 7, The first insulating space is arranged adjacent to one of the inner and outer tanks, and the second insulating space is arranged adjacent to the other of the inner and outer tanks. The above first vacuum insulation material is provided to have different insulation performance from the normal pressure insulation material or the pressure-reducing insulation material. Vacuum insulation system for liquefied gas storage tanks.

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