Dual liquefied gas storage container

Abstract

To provide a dual liquefied gas storage container, in particular to a dual liquefied gas storage container having internal supports.SOLUTION: The present invention relates to a double liquefied gas storage container having internal supports, which are configured to secure robustness of a structure against a load generated during transportation of liquefied gas and prevent inflow of heat by introduction of the internal support in a form of being inserted into a bracket provided in an inner tank or an outer tank. The dual liquefied gas storage container has a structure robust against an acceleration load generated during transportation, and effectively blocks the inflow of heat from an outside by installation of a minimum number of internal supports, with the internal supports being made of a material having low thermal conductivity. In addition, The internal support are not disposed in all directions in an annular space so as to facilitate manufacturing, enhance productivity, reduce volume of the outer tank and a load weight of the transportation vehicle, thereby increasing economic efficiency.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a dual liquefied gas storage container, in particular a dual liquefied gas storage container having an internal support, and more particularly to a dual liquefied gas storage container having an internal support that is inserted into a bracket provided on an inner or outer tank, thereby ensuring structural robustness against loads generated during transportation of liquefied gas and preventing heat inflow. [Background technology]

[0002] Ultra-low temperature liquefied gas (hereinafter referred to as liquefied gas) has a low temperature and little latent heat, so it can be easily vaporized even with a small amount of heat inflow. Therefore, for the storage of liquefied gas, it is necessary to use a double storage container (hereinafter referred to as storage container) consisting of an inner tank and an outer tank for excellent insulation performance.

[0003] Liquefied gas is primarily used as fuel for energy production. It is stored in fuel tanks, such as in automobiles, to provide propulsion, or transported by trailer to supply where it is needed. Storage vessels must be structurally robust to withstand the load combinations that may occur during operation.

[0004] Typical loads generated during operation include the pressure of the liquefied gas, the weight of the liquefied gas, the pressure of the insulation material, atmospheric pressure, gravity, and acceleration due to operation. Different loads act on different parts of the storage container. Figure 1 shows a typical storage container. A dual-layer liquefied gas storage container basically includes an inner tank 510, an outer tank 520, an annular space 530, piping 540, and legs 550. The inner tank 510 stores liquefied gas and is therefore required to be pressure-resistant and cryogenically compatible. The outer tank 520 prevents external impacts and heat inflow from the inner tank 510 and is fixed to the ground by the legs 550. Depending on the situation, it may be required to have strong external pressure resistance against vacuum pressure (atmospheric pressure). The annular space 530 represents the difference in volume between the outer tank 520 and the inner tank 510, and is where the insulation material, piping 540, internal support, etc. are located. Liquefied gas is transferred to the inner tank 510 and the outside through the piping 540, which is made of a material with high thermal conductivity, just like the inner tank 510 and the outer tank 520. Therefore, it is necessary to ensure a sufficient length within the annular space 530 and to take measures against low-temperature shrinkage.

[0005] The internal support, shown by a dotted oval in FIG. 1, separates the inner vessel 510 from the outer vessel 520. In other words, it plays a role in maintaining the stability of the annular space 530. The internal support simultaneously performs various functions, such as structural robustness and preventing heat inflow. Among the loads acting on the storage container mentioned above, especially loads due to acceleration, the internal support must ensure robustness. Korean Patent Registration No. 2360225 ("Support Device for Inner and Outer Vessels of Cryogenic Tank," February 3, 2022) discloses technology in which a support device installed between the inner and outer vessels is configured to have different functions and actions depending on its position.

[0006] FIG. 1 and the prior art document explain that such internal supports are provided on all sides of the inner vessel. Of course, this arrangement is considered natural because acceleration can act from all directions. Meanwhile, since the inner vessel contains cryogenic liquefied gas, while the outer vessel is in contact with the external environment, thorough insulation between the inner and outer vessels is required to prevent heat from entering the inner vessel. This requires either creating a vacuum in the annular space or providing insulation to act as an insulating layer. However, because the internal supports themselves connect the inner and outer vessels, they cannot completely block the inflow of heat generated by thermal conduction through the internal supports. While arranging multiple internal supports on all sides of the inner vessel, as described above, provides structural stability, it only increases the inflow of heat into the inner vessel. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent Registration No. 2360225 ("Support device for inner and outer tanks of ultra-low temperature tank", February 3, 2022) Summary of the Invention [Problem to be solved by the invention]

[0008] One object of the present invention is to ensure that the internal support is inserted into the inner tank, thereby ensuring robustness of the structure against acceleration loads that occur during operation of the storage container.

[0009] Another object of the present invention is to prevent heat from entering the inner vessel and minimize evaporation of the liquefied gas by using a small number of internal supports.

[0010] It is yet another object of the present invention to simplify the manufacturing process of the storage container by eliminating the need for internal supports in all directions.

[0011] Another object of the present invention is to reduce the volume of the storage container and increase the storage efficiency of liquefied gas by minimizing the volume of the annular space (the distance between the inner tank and the outer tank) in the direction in which the internal support is not arranged.

[0012] Another problem is that in the case of large storage containers, the relative positions of the inner and outer shells change due to low-temperature shrinkage, which applies stress to the inner support, so it is necessary to ensure the proper alignment of the inner support and the outer shell bracket.

[0013] The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0014] The dual liquefied gas storage container 500 according to the present invention includes an inner tank 510 having an internal space, an outer tank 520 in which the inner tank 510 is accommodated at a predetermined interval in the internal space, and an annular space 530 formed as a space between the inner tank 510 and the outer tank 520. The dual liquefied gas storage container 500 further includes an internal support 100 disposed between the inner tank 510 and the outer tank 520 to maintain a separation distance and thereby form the annular space 530. The internal support 100 has a columnar shape extending in a direction separating the inner tank 510 and the outer tank 520. An insertion hole 150 is formed at one end thereof so that a bracket 110 protruding from the outer tank 520 or the inner tank 510 can be inserted therein, and the other end thereof can be inserted into an insertion structure provided in the inner tank 510 or the outer tank 520.

[0015] In one embodiment, the dual liquefied gas storage container 500 may be provided with a recess 120 recessed inward from the inner tank 510 at a position on the inner tank 510 opposite the bracket 110 provided on the outer tank 520 so that the other end of the internal support 100 can be inserted therein.

[0016] In another embodiment, the dual liquefied gas storage container 500 may include a receiving portion 130 that protrudes from the inner tank 510 or the outer tank 520 and is formed to surround and receive the other end of the internal support 100 at a position on the inner tank 510 or the outer tank 520 opposite the bracket 110 provided on the outer tank 520 or the inner tank 510, so that the other end of the internal support 100 can be inserted therein.

[0017] Here, the dual liquefied gas storage container 500 may be provided with a plurality of support stands 135 that connect and support the outer surface of the accommodating part 130 in the circumferential direction and the outer surface of the inner tank 510 in which the accommodating part 130 is provided, or that connect and support the outer surface of the accommodating part 130 in the circumferential direction and the inner surface of the outer tank 520, so as to support the accommodating part 130 in the circumferential direction.

[0018] In addition, the dual liquefied gas storage container 500 may have a plurality of support stands 135 arranged radially around the receiving part 130 .

[0019] In addition, the dual liquefied gas storage container 500 may have the internal support 100 provided only in the upper and lower spaces of the annular space 530 .

[0020] In addition, the dual liquefied gas storage container 500 may be formed such that the number of the internal supports 500 provided in the lower space is equal to or greater than the number of the internal supports 500 provided in the upper space.

[0021] Also, a plurality of the dual liquefied gas storage vessels 500 may be provided in the longitudinal direction in which the inner support 100 extends horizontally.

[0022] Here, the dual liquefied gas storage container 500 may include a reinforcing part 140 that is protruded from the outer tank 520 or the inner tank 510 and that reinforcingly supports the outer surface of one end of the inner support 100 that is in close contact with the outer tank 520 or the inner tank 510.

[0023] In addition, the dual liquefied gas storage container 500 is provided with different reinforcing parts 140 depending on the arrangement positions of each of the multiple internal supports 100. In this case, when the internal support 100 is arranged at the center in the longitudinal direction, the reinforcing parts 140 are provided on both the left and right sides along the longitudinal direction, and when the internal support 100 is arranged offset along the longitudinal direction, the reinforcing parts 140 may be provided only on the side in the offset direction.

[0024] In addition, the dual liquefied gas storage container 500 may be formed such that the material of the inner support 100 has a relatively lower thermal conductivity than the material of the inner vessel 510 or the outer vessel 520 . [Effects of the Invention]

[0025] According to the above-described means for solving the problems of the present invention, the internal support of a dual liquefied gas storage container according to the present invention must be structurally designed to be strong against a combination of loads that may occur during movement. The internal support according to the present invention is formed in such a way that one side is fixed by inserting a bracket, and the other side is inserted and fixed into an insertion recess or insertion protrusion, thereby ensuring sufficient stability against loads that may occur during movement. In addition, the internal support provides structural robustness against all of the pressure resistance of the inner tank, the weight of the liquefied gas, and the atmospheric pressure of the outer tank.

[0026] The internal support is required to maintain thermal insulation and to protect against low-temperature shrinkage, as the inner vessel filled with cryogenic liquefied gas comes into direct contact with the outer vessel. Instead of metal, the internal support is made of materials with low thermal conductivity, such as high-pressure glass fiber, polymers, plastics, and wood, which effectively blocks heat flow from the outer vessel to the inner vessel and provides robustness against low-temperature shrinkage. Furthermore, since only a minimal amount of internal support is inserted compared to conventional internal supports, contact with the outside is minimized, reducing heat flow.

[0027] Furthermore, the present invention minimizes the number of internal supports required and allows them to be inserted into the outer shell bracket and the inner shell without additional welding. Conventional methods require internal supports to be positioned in all directions within the annular space, making construction and assembly extremely difficult. Therefore, the present invention provides the benefits of improved ease of assembly and manufacturing, as well as improved productivity.

[0028] Furthermore, the present invention improves economy by reducing the volume of the annular space compared to conventional storage containers. The volume of the annular space can be reduced by installing minimal internal supports, and the reduction in the volume of the outer tank can reduce manufacturing costs. Furthermore, transportation efficiency is improved because less cargo can be loaded onto transportation vehicles such as trailers and trucks compared to conventional storage containers.

[0029] Depending on the shape of the internal support and its connection to the inner and outer vessels, only compressive forces act on the internal support. Generally, internal supports with higher compressive strength compared to tensile, shear, and bending strength have structural robustness against loads acting only on small dimensions. As a result, internal supports with small dimensions minimize the evaporation of liquefied gas by reducing the heat flowing into the inner vessel.

[0030] In the case of large storage containers, the internal support is positioned taking into account the amount of shrinkage that occurs during low-temperature thermal contraction. Because the internal tank shrinks at the center of the storage container, for internal supports that are located away from the center, the outer tank bracket is positioned on the outer surface of the internal support. This ensures that only compressive forces act on the internal support even when shrinkage occurs, and the outer tank bracket positioned on the outer surface ensures the robustness of the structure even when acceleration loads occur. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 shows a typical conventional dual liquefied gas storage vessel. [Figure 2] FIG. 1 shows a dual liquefied gas storage vessel with an internal support of the present invention. [Figure 3] FIG. 1 is a front view of a dual liquefied gas storage container of the present invention (only the inner tank, outer tank, and internal support are shown). [Figure 4] FIG. 1 is a front view of a dual liquefied gas storage vessel of the present invention (with remaining components shown). [Figure 5] FIG. 1 is a perspective view of a dual liquefied gas storage vessel of the present invention. [Figure 6] 1A-1C illustrate various embodiments of the internal support of the present invention. [Figure 7] 10A-10C show other embodiments of the internal support of the present invention. [Figure 8] FIG. 2 is a diagram showing the stress distribution in the dual liquefied gas storage container of the present invention. [Figure 9] FIG. 10 shows the stress distribution of the internal support of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Fig. 2 is a diagram illustrating a dual liquefied gas storage container having an internal support of the present invention. Fig. 3 and Fig. 4 are front views of the dual liquefied gas storage container of the present invention. Fig. 3 is a diagram illustrating only the inner tank 510, outer tank 520, and internal support 100 to clearly show the arrangement of the internal support 100, while Fig. 4 is a diagram illustrating the remaining components to show the overall structure. Fig. 5 is a perspective view of the dual liquefied gas storage container of the present invention.

[0033] The dual liquefied gas storage container 500 having an internal support of the present invention has all the components of a general dual liquefied gas storage container as shown in Fig. 1. More specifically, the dual liquefied gas storage container 500 of the present invention includes an inner tank 510 having an internal space, an outer tank 520 in which the inner tank 510 is accommodated at a predetermined distance from the inner tank 510, and an annular space 530 formed as a space between the inner tank 510 and the outer tank 520. The dual liquefied gas storage container 500 also includes a pipe 540 for circulating liquefied gas in the internal space of the inner tank 510, and legs 550 fixed to the bottom of the outer tank 520 and fixedly supported on the ground.

[0034] In addition, the dual liquefied gas storage container 500 of the present invention includes an internal support 100 that is provided between the inner vessel 510 and the outer vessel 520 to maintain a separation distance and thereby form the annular space 530. Unlike the conventional internal support shown in Fig. 1, the internal support 100 of the present invention has an improved structure and arrangement position, thereby ensuring structural stability and eliminating the problem of heat inflow that has been caused by the conventional internal support.

[0035] FIG. 6 is a diagram illustrating various embodiments of the internal support of the present invention. First, the structure of the internal support of the present invention will be specifically described with reference to FIG.

[0036] As shown in various embodiments of FIG. 6 , the internal support 100 of the present invention is basically formed in a columnar shape extending in the direction of separation between the inner tank 510 and the outer tank 520. Here, an insertion hole 150 is formed at one end of the internal support 100. The insertion hole 150 may face the outer tank 520 as in the embodiments of FIGS. 6 (A) and (B), or may face the inner tank 510 as in the embodiment of FIG. 6 (C). For clarity of explanation, the one side and the other side of the internal support 100 are defined based on the insertion hole 150. Therefore, when only the internal support 100 is viewed, the insertion hole 150 may always be considered to be formed on “one side” of the internal support 100.

[0037] A bracket 110 is protruded from the outer tank 520 or the inner tank 510 corresponding to the insertion hole 150. Specifically, depending on the orientation of the insertion hole 150, the bracket 110 may be formed on the outer tank 520 or the inner tank 510. As described above, when the insertion hole 150 faces the outer tank 520, as in the embodiments of Figures 6(A) and 6(B), the bracket 110 naturally protrudes from the outer tank 520. Conversely, when the insertion hole 150 faces the inner tank 510, as in the embodiment of Figure 6(C), the bracket 110 naturally protrudes from the inner tank 510.

[0038] The protruding bracket 110 is inserted into the insertion hole 150 to be coupled to the inner support 100. That is, one side of the inner support 100 is firmly coupled to the outer tank 520 (embodiment of FIGS. 6A and 6B) or the inner tank 510 (embodiment of FIG. 6C) through the coupling of the insertion hole 150 and the bracket 110.

[0039] Meanwhile, the other side of the internal support 100 must also be firmly connected to the opposite structure. As described above, one side of the internal support 100 is connected in a manner in which the bracket 110 provided on the structure is fitted into the insertion hole 150 formed in the internal support 100. The other side of the internal support 100 is connected in a manner in which the outer shape of the internal support 100 itself is fitted into an insertion structure provided on the opposite structure. While both sides can have the same connection shape, this requires the insertion hole 150 to be drilled on both sides, potentially reducing the structural strength of the internal support 100. Furthermore, no matter how long the brackets protruding from both sides are, they cannot overlap. Furthermore, considering manufacturing and assembly errors, empty spaces inevitably occur between the brackets, potentially reducing the stability of the connected structure. To prevent this problem, the connection structure on one side of the internal support 100 is made different from the connection structure on the other side.

[0040] Of course, in consideration of this, it can be inferred that the strength of the overall connection structure can be further improved by forming the connection structure on one side and the connection structure on the other side of the internal support 100 separately as shown in Fig. 6. That is, as shown in the figure, by forming the connection structure on one side and the connection structure on the other side to overlap each other at the center, the connection strength at the center of the internal support 100 can be further strengthened.

[0041] In addition, the following considerations may be taken into account regarding the other-side coupling structure. As in the embodiments of FIGS. 6A and 6B, if the other end of the internal support 100 faces the inner vessel 510 and the other-side coupling structure is provided in the inner vessel 510, the other-side coupling structure may contract due to the cryogenic liquefied gas contained in the inner vessel 510. However, the internal support 100 is generally formed of a material having a relatively lower thermal conductivity than the material of the internal vessel 510 or the outer vessel 520. Specifically, high-pressure glass fiber, polymer, plastic, wood, or the like may be used. Such materials not only have low thermal conductivity but also have robustness against compression. Considering this, if the other-side coupling structure is formed such that the other end of the internal support 100 is received and coupled to an insertion structure, even if the other-side coupling structure contracts and the internal support 100 is subjected to compression, the internal support 100 has high robustness against compression, reducing the risk of damage or breakage of the coupling structure.

[0042] The coupling structure on the other side of the inner support 100 is such that the other end is inserted into an insertion structure provided in the inner tank 510 or the outer tank 520. When the end on which the insertion hole 150 is formed faces the outer tank 520 (the embodiment of FIGS. 6A and 6B), the insertion structure coupled with the other end is naturally formed in the inner tank 510. When the end on which the insertion hole 150 is formed faces the inner tank 510 (the embodiment of FIG. 6C), the insertion structure is also naturally formed in the outer tank 520. As explained above, FIGS. 6A and 6B / 6C are diagrams showing changes depending on the direction of the insertion hole. Meanwhile, FIGS. 6A / 6B and 6C are diagrams showing changes in the shape of the insertion structure itself.

[0043] First, the insertion structure shown in Fig. 6(A) will be described in detail as follows. In the embodiment of Fig. 6(A), the insertion structure is formed in the form of a recess 120. Specifically, at a position on the inner tank 510 opposite the bracket 110 provided on the outer tank 520, a recess 120 is provided that is recessed inward from the inner tank 510 so that the other end of the inner support 100 can be inserted therein.

[0044] The recess 120 can be formed by drilling a hole in the inner vessel 510, fitting a pipe-shaped structure with one end closed into the hole, and then welding the structure. Alternatively, the recess 120 can be formed in the inner vessel 510 by pressing, but welding is obviously safer for increasing structural strength. The recess 120 can also be integrally formed during the manufacturing process of the inner vessel 510 itself. As described above, the recess 120 can be formed by any method as long as it allows the other end of the internal support 100 to be smoothly inserted. Of course, the recess 120 should have an inner diameter that is equal to or slightly larger than the outer diameter of the other end of the internal support 100 so that the other end of the internal support 100 can be smoothly inserted. The depth of the recess 120 can be determined depending on the connection depth of the internal support 100.

[0045] Furthermore, when the insertion structure is formed in the form of the recess 120, it is preferable that such an insertion structure be formed only in the inner tank 510. Of course, theoretically, there is no problem with the connection itself even if such an insertion structure is formed in the outer tank 520. However, when the recess 120 is formed in the outer tank 520, the recess 120 protrudes when viewed from the outside of the outer tank 520. This increases the risk of breakage or damage due to physical impact, such as being struck by a foreign object from the outside, or chemical damage caused by climate or environmental changes. Therefore, it is highly undesirable to provide an insertion structure in the form of the recess 120 in the outer tank 520. On the other hand, when the recess 120 is formed in the inner tank 510 and protrudes from the inside of the inner tank 510, the liquefied gas is simply stably contained inside the inner tank 510, and there is no risk of any impact or damage occurring. Therefore, it is much more preferable that the insertion structure in the form of the recess 120 be provided in the inner tank 510.

[0046] Next, the insertion structure shown in Figures 6(B) and (C) will be described in detail as follows. In the embodiments of Figures 6(B) and 6(C), the insertion structure is formed in the form of a receiving part 130. That is, to be more specific, a receiving part 130 is provided at a position on the inner tank 510 or the outer tank 520 opposite the bracket 110 provided on the outer tank 520 or the inner tank 510, which is formed to protrude from the inner tank 510 or the outer tank 520 and surround and receive the other end of the inner support 100 so that the other end of the inner support 100 is inserted therein.

[0047] The receiving part 130 exists only in the annular space 530, similar to the bracket 110, without any relation to the inside of the inner tank 510 or the outside of the outer tank 520. Therefore, unlike the recess 120, the receiving part 130 may be formed in either the inner tank 510 or the outer tank 520. The receiving part 130 simply needs to be fitted and fixed to the other end of the inner support 100, and therefore may be formed in a pipe shape with an inner diameter equal to or slightly larger than the outer diameter of the other end of the inner support 100, and may be fixed to the outer surface of the inner tank 510 or the inner surface of the outer tank 520 by welding or the like.

[0048] In the case of the recess 120, the recess 120 protrudes toward the inside of the inner tank 510, and this space is filled only with liquefied gas (and its vapor), which poses little risk of physical impact or chemical damage. Therefore, welding the pipe periphery alone is considered to be sufficiently strong to secure the recess 120. Even if the assembly direction is slightly off, the hole that serves as the entrance to the recess 120 is the first to receive impact, so no significant impact is applied to the connection. On the other hand, in the case of the receiving portion 130, although there is no problem if the annular space 530 is evacuated, there are problems such as the possibility that it may be filled with another insulating material, and that impact may be applied due to misalignment of the assembly direction during the assembly process. Therefore, welding the pipe periphery alone may not be strong enough.

[0049] 6(B) and 6(C), it is preferable that the receiving unit 130 be provided with a plurality of supports 135 that connect and support the outer peripheral surface of the receiving unit 130 and the outer peripheral surface of the inner tub 510 in which the receiving unit 130 is installed, or that connect and support the outer peripheral surface of the receiving unit 130 and the inner peripheral surface of the outer tub 520, so as to support the receiving unit 130 in the circumferential direction, as shown in FIG. 6(B) and 6(C). The drawings are cross-sectional views viewed from the front, and the supports 135 appear to be provided only on the left and right sides of the receiving unit 130, but of course, the plurality of supports 135 should be arranged radially from the receiving unit 130 to ensure sufficient structural stability.

[0050] Even if the internal support 100 is subjected to an external force, only a compressive force is applied to the internal support 100, as shown in FIG. 6. In FIG. 6, the force applied to the internal support 100 is indicated by an arrow. As indicated by the arrow, when a connection structure such as that of the present invention is adopted, the internal support 100 is not subjected to shear, bending, or tensile forces, but rather only a compressive force as a whole. As described above, the internal support 100 may be made of a material with low thermal conductivity, such as high-pressure glass fiber, polymer, plastic, or wood, and these materials have high strength against compressive forces. In other words, when the connection structure of the present invention is adopted, the internal support 100 is formed to only receive a compressive force, thereby improving the robustness of the connection structure itself.

[0051] In this way, by improving the robustness of the coupling structure of the internal support 100, it is possible to ensure the overall maintaining force of the annular space 530 even if the internal support 100 is not disposed in all directions. This is the ultimate objective of the present invention to improve the robustness of the coupling structure of the internal support 100.

[0052] As shown in Figures 2 to 5, in the present invention, the internal supports 100 are provided only in the upper and lower spaces of the annular space 530 of the dual liquefied gas storage container 500. Conventionally, as shown in Figure 1, at least six internal supports are provided, i.e., on the upper, lower, left, right, front, and rear sides. However, in the present invention, by providing the internal supports 100 only in the upper and lower spaces, it is possible to provide only two internal supports 100 at a minimum.

[0053] However, when the inner tank 510 is filled with liquefied gas, the weight of the liquefied gas applies a large force to the lower space, so in consideration of this, it is preferable that the number of the internal supports 100 provided in the lower space is equal to or greater than the number of the internal supports 100 provided in the upper space. In consideration of this, as shown in Figures 2 to 5, one internal support 100 may be provided in the upper space of the annular space 530, and two internal supports 100 may be provided in the lower space. Even in this case, the number of internal supports is three, which is half of the number in the conventional case of Figure 1.

[0054] FIG. 7 is a view illustrating another embodiment of the internal support of the present invention, illustrating a case in which the dual liquefied gas storage container 500 is formed longer in the horizontally extending longitudinal direction (obviously, since the drawing is a plan view, it appears long only in the left-right direction, but it may also be formed longer in the front-to-back direction). In this case, as illustrated, a plurality of internal supports 100 may be provided in the horizontally extending longitudinal direction. FIG. 7 illustrates an example in which the dual liquefied gas storage container 500 is formed long in the left-right direction, and three internal supports 100 are provided only in the lower space (i.e., one more than in the cases of FIGS. 2 to 5).

[0055] When a plurality of internal supports 100 are provided, a reinforcing member 140 may be provided to reinforce the outer surface of one end of the internal support 100 that is in close contact with the outer tub 520 or the inner tub 510, as shown in the drawings, in order to further improve the strength of the combined structure of the internal support 100. The reinforcing member 140 protrudes from the outer tub 520 or the inner tub 510 and serves to support one end of the internal support 100, thereby reinforcing the strength of the combined structure. Furthermore, in consideration of the fact that the direction of external force may be biased depending on the arrangement position of each of the multiple internal supports 100, the reinforcing members 140 may be provided at different positions. Specifically, as shown in the lower view of FIG. 7, when the internal support 100 is arranged at the center in the longitudinal direction, the reinforcing members 140 may be provided on both the left and right sides along the longitudinal direction. Alternatively, when the internal support 100 is disposed with a bias along the longitudinal direction, the reinforcing portion 140 may be provided only on the side of the bias direction.

[0056] Of course, even if the internal support 100 is further arranged in the lower space in this way, as compared to the embodiment of Figure 7, only four internal support members 100 are provided, which is fewer than the conventional six, and the total number of internal support members 100 provided can be reliably reduced.

[0057] As described above, reducing the number of internal supports 100 is equivalent to reducing the amount of heat inflow. As described above, the inner vessel 510 contains cryogenic liquefied gas, and the outer vessel 520 is exposed to the room-temperature external environment. To minimize heat transfer between them, the annular space 530 is formed between the inner vessel 510 and the outer vessel 520 to allow vacuum insulation or the insertion of a heat insulating material. However, the internal support 100 is unavoidably provided to maintain the annular space 530, and since the internal support 100 necessarily physically connects the inner vessel 510 and the outer vessel 520, it is impossible to completely prevent heat transfer by conduction. In other words, the existence of the internal support 100 itself causes heat to flow from the outer vessel 520 to the inner vessel 510.

[0058] Therefore, in order to minimize the amount of heat inflow, it is necessary to reduce the number of the internal supports 100. Conventionally, a total of six internal supports have been provided, with one internal support provided in each direction. However, in the present invention, the connection structure of the internal supports has been improved to increase their robustness, thereby ensuring a connection force that can stably maintain the annular space 530 even without providing internal supports 100 in all directions. As a result, the number of internal supports 100 can be significantly reduced compared to the conventional case, and naturally, the amount of heat inflow can also be significantly reduced.

[0059] Figure 8 shows the results of a simulation of stress distribution in a dual liquefied gas storage container of the present invention, and Figure 9 shows the results of a simulation of stress distribution in an internal support of the present invention. As shown in Figure 8, external conditions were applied in which a gravitational acceleration of 1g acts vertically downward and an acceleration of 10g acts forward. When the internal support connection structure of the present invention is adopted, it can be experimentally confirmed that sufficient robustness is ensured as shown in Figures 8 and 9, even though only a minimum number of internal supports are arranged (i.e., internal supports are arranged in only two locations, upper and lower).

[0060] The present invention is not limited to the above-described embodiments, and it goes without saying that the scope of application is diverse. It goes without saying that anyone with ordinary knowledge in the field to which the present invention pertains can make various modifications without departing from the gist of the present invention as claimed in the claims. [Explanation of symbols]

[0061] 500 Double Liquefied Gas Storage Container 510 Inner tank 520 Outer tank 530 Annular space 540 Piping 550 Legs 100 Internal support 110 Bracket 120 Depression 130 Storage unit 135 Support stand 140 Reinforcement 150 Insertion hole

Claims

1. A dual liquefied gas storage container (500) including an inner tank (510) having an internal space, an outer tank (520) in which the inner tank (510) is accommodated in the internal space at a predetermined interval, and an annular space (530) formed as a space between the inner tank (510) and the outer tank (520), an internal support (100) provided between the inner tank (510) and the outer tank (520) to maintain a separation distance and thereby form the annular space (530); The inner support (100) is formed in a columnar shape extending in the direction separating the inner tank (510) and the outer tank (520), and An insertion hole 150 is formed at one end of the outer tub 520 or the inner tub 510, and the bracket 110 is inserted into the insertion hole 150. The other end of the dual liquefied gas storage container is formed to be inserted into an insertion structure provided in the inner tank (510) or the outer tank (520).

2. The dual liquefied gas storage vessel (500) comprises: The other end of the inner support 100 is inserted into a position on the inner tank 510 opposite to the bracket 110 provided on the outer tank 520. The dual liquefied gas storage container according to claim 1, wherein a recess (120) is provided inwardly from the inner tank (510).

3. The dual liquefied gas storage vessel (500) comprises: The other end of the inner support 100 is inserted into a position on the inner tank 510 or the outer tank 520 opposite to the bracket 110 provided on the outer tank 520 or the inner tank 510, 2. The dual liquefied gas storage container according to claim 1, further comprising a receiving portion (130) protruding from the inner tank (510) or the outer tank (520) and configured to surround and receive the other end of the internal support (100).

4. The dual liquefied gas storage vessel (500) comprises:

4. The dual liquefied gas storage container according to claim 3, wherein a plurality of support stands (135) are provided to connect and support the outer circumferential surface of the container (130) and the outer surface of the inner tank (510) in which the container (130) is provided, or to connect and support the outer circumferential surface of the container (130) and the inner surface of the outer tank (520), so as to support the container (130) in the circumferential direction.

5. The dual liquefied gas storage vessel (500) comprises: The dual liquefied gas storage vessel according to claim 4, wherein a plurality of the support bases (135) are arranged radially around the storage portion (130).

6. The dual liquefied gas storage vessel (500) comprises:

4. The dual liquefied gas storage vessel according to claim 2 or 3, characterized in that the internal support (100) is provided only in the upper and lower spaces of the annular space (530).

7. The dual liquefied gas storage vessel (500) comprises: The dual liquefied gas storage container according to claim 6, wherein the number of the internal supports (100) provided in the lower space is equal to or greater than the number of the internal supports (100) provided in the upper space.

8. The dual liquefied gas storage vessel (500) comprises:

7. The dual liquefied gas storage vessel according to claim 6, wherein a plurality of the internal supports (100) are provided in a horizontally extending longitudinal direction.

9. The dual liquefied gas storage vessel (500) comprises:

9. The dual liquefied gas storage container according to claim 8, further comprising a reinforcing portion (140) protruding from the outer tank (520) or the inner tank (510) to reinforcingly support the outer surface of one end of the inner support (100) that is in close contact with the outer tank (520) or the inner tank (510).

10. The dual liquefied gas storage vessel (500) comprises: The reinforcing portion (140) is provided differently depending on the arrangement position of each of the plurality of internal supports (100), and at this time, When the internal support (100) is positioned at the center in the longitudinal direction, the reinforcing portions (140) are provided on both the left and right sides along the longitudinal direction; The dual liquefied gas storage container according to claim 9, characterized in that when the internal support (100) is arranged offset along the longitudinal direction, the reinforcing portion (140) is provided only on the side in the offset direction.

11. The dual liquefied gas storage vessel (500) comprises: The dual liquefied gas storage container according to claim 1, wherein the material of the internal support (100) is formed of a material having a relatively lower thermal conductivity than the material of the inner tank (510) or the outer tank (520).

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