A liquefied gas storage tank and a ship for transporting liquefied gas

Abstract

This invention discloses a liquefied gas storage tank and a vessel for transporting liquefied gas. The liquefied gas storage tank includes a main shielding layer that contacts the liquefied gas on one side, a secondary shielding layer disposed on the other side of the main shielding layer, and at least one liquefied gas loading / unloading tower. The base of the liquefied gas loading / unloading tower includes: a lower part of the base body fixedly connected to the bottom wall; a corrugated plate of the secondary shielding layer connected to the lower part of the base body; and a closed end at one end of at least one corrugation of the secondary shielding layer facing the lower part of the base body. An upper part of the base body has mounting holes in the main shielding layer, through which the upper part of the base body is fixedly connected to the lower part of the base body. By opening mounting holes on the flat surface of the main shielding layer to achieve the installation of the pump tower base, the integrity of the corrugated structure of the main shielding layer is fully preserved, ensuring the expansion and contraction performance of the main shielding layer in low-temperature environments and improving the low-temperature sealing reliability of the storage tank.

Description

Technical Field

[0001] This invention relates to the field of liquefied natural gas (LNG) storage tank containment film manufacturing technology, specifically to an LNG storage tank and a ship for transporting LNG. Background Technology

[0002] Cryogenic membrane tanks are large tank structures used for storing cryogenic media such as liquefied natural gas (LNG), typically for the storage and long-distance transportation of LNG. From the inside out, a cryogenic membrane tank generally consists of a main shielding layer, a main plywood layer, a secondary shielding layer, and an insulation box.

[0003] Due to the low temperature and easy expansion characteristics of LNG, the inner wall of cryogenic membrane tanks is usually made of corrugated plates. The corrugated surface of the plates can accommodate contraction, thus addressing the issue of LNG's supercooling and contraction. In addition to the corrugated plate inner membrane tank, cryogenic membrane tanks also require components such as pump towers and cooling equipment. The pump tower runs through the inside of the membrane tank for LNG input and output. The pump tower typically requires connecting structures at the top and bottom of the membrane tank for fixation; therefore, a pump tower base is needed to secure the pump tower within the membrane tank.

[0004] In the conventional fabrication of cryogenic membrane tanks, the pump tower base is placed on the upper surface of the outer tank structure, requiring the base to penetrate the main and secondary shielding layers of the membrane tank. This penetration directly disrupts the overall continuity of the main and secondary shielding layers, significantly impacting their thermal expansion and contraction properties. This can easily lead to localized stress concentration and deformation jamming within the shielding layers, resulting in localized sealing failure, structural cracking, or even damage after prolonged use. Consequently, this can cause safety hazards such as cryogenic medium leakage and tank insulation failure, shortening the tank's lifespan and increasing maintenance costs.

[0005] Therefore, there is a need to provide a liquefied gas storage tank and a ship for transporting liquefied gas to at least partially solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a liquefied gas storage tank and a ship for transporting liquefied gas, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a liquefied gas storage tank, comprising at least one top wall, a bottom wall, and a plurality of side walls extending between the top wall and the bottom wall. The liquefied gas storage tank includes a main shielding layer with one side in contact with liquefied gas, a secondary shielding layer disposed on the other side of the main shielding layer, and at least one liquefied gas loading / unloading tower. The liquefied gas loading / unloading tower extends between the top wall and the bottom wall and includes a base at the bottom. The base includes:

[0009] The lower part of the base body is fixedly connected to the bottom wall. The corrugated plate of the secondary shielding layer is connected to the lower part of the base body. The corrugated plate of the secondary shielding layer includes a plurality of corrugations. At least one of the corrugations has a closed end at one end facing the lower part of the base body.

[0010] The upper part of the base body has mounting holes for the main shielding layer, and the upper part of the base body is fixedly connected to the lower part of the base body through the mounting holes.

[0011] By opening mounting holes in the main shielding layer, the upper part of the base body passes through the mounting holes and is fixedly connected to the lower part of the base body. This does not damage the corrugated structure of the main shielding layer or affect the continuity of the corrugations, thus maintaining the overall integrity of the main shielding layer to the greatest extent. Consequently, when the main shielding layer comes into contact with cryogenic liquefied gas, it can ensure excellent thermal expansion and contraction performance, avoiding stress concentration and structural cracking. The secondary shielding layer operates at a relatively high temperature. The connection with the pump tower base uses a corrugated closed end interruption method, which can ensure the stability of the pump tower base and meet the overall expansion and contraction performance of the secondary shielding layer.

[0012] Preferably, the corrugated plate of the main shielding layer includes a plurality of first corrugations extending along a first direction and a plurality of second corrugations extending along a second direction, a knot formed by the intersection of the first corrugations and the second corrugations, and a flat surface between the first corrugations and the second corrugations.

[0013] The mounting hole is formed on a flat surface between the two first corrugations and / or the two second corrugations.

[0014] The mounting holes are made on a flat surface between the two first corrugations and / or the two second corrugations, avoiding the corrugation deformation area, further ensuring the normal expansion and contraction of the main shielding layer corrugations, and avoiding stress concentration around the mounting holes.

[0015] Preferably, the upper part of the base body is provided with a plurality of through slots, and at least two of the first corrugations and at least two of the second corrugations directly pass through the plurality of through slots.

[0016] The corrugations of the main shielding layer can pass directly through several through slots without cutting the corrugated structure, thus maximizing the preservation of the continuity and expansion / deformation capability of the main shielding layer corrugations.

[0017] Preferably, at least two of the first corrugations and at least two of the second corrugations are deviated from their alignment to avoid the mounting position of the upper part of the base body on the main shielding layer.

[0018] If the corrugations of the main shielding layer need to pass through the installation position of the base body on the main shielding layer, the corrugations can be deviated from their guideline to avoid the installation position without cutting the corrugation structure, thus maximizing the preservation of the continuity and expansion and contraction capability of the main shielding layer corrugations.

[0019] Preferably, the two first corrugations or the two second corrugations on one side of the upper part of the base body are connected; and / or,

[0020] The first corrugation and the second corrugation are connected on adjacent sides of the upper part of the base body.

[0021] By changing the connection method of the corrugations, the installation location can be avoided, and a complete corrugated deformation network can be formed, thereby improving the overall uniformity of expansion and contraction of the main shielding layer.

[0022] Preferably, the corrugation spacing of the corrugated plate of the secondary shielding layer is greater than the corrugation spacing of the corrugated plate of the primary shielding layer.

[0023] The corrugated plate's corrugation spacing is adapted to the different operating temperatures and expansion / contraction requirements of the primary and secondary shielding layers. The primary shielding layer operates at a relatively lower temperature, so a smaller spacing corrugation with more corrugations is used to meet greater deformation requirements. The secondary shielding layer operates at a relatively higher temperature, so a larger spacing corrugation can both meet deformation requirements and improve structural rigidity.

[0024] Preferably, the ratio of the corrugation spacing of the corrugated plate of the main shielding layer to the corrugation spacing of the corrugated plate of the secondary shielding layer is 2:3.

[0025] Preferably, the corrugated plate of the secondary shielding layer includes a plurality of third corrugations extending along a first direction and a plurality of fourth corrugations extending along a second direction, wherein the third corrugations and the fourth corrugations intersect to form a knot, and only one of the third corrugations and the fourth corrugations has a closed end facing the lower part of the base body.

[0026] The center of the base is located at the intersection of the guide lines of the third corrugation with a closed end and the fourth corrugation with a closed end.

[0027] The secondary shielding layer operates at a relatively high temperature. It is interrupted only at the connection with the pump tower base by a single corrugated closed end. This ensures the connection stability of the pump tower base while preserving the overall expansion and contraction performance of the secondary shielding layer. This effectively solves the problems of sealing failure and structural damage caused by the base penetrating the shielding layer in the existing technology, and improves the overall service life and operational safety of the storage tank.

[0028] Preferably, the corrugations of the main shielding layer face inwards towards the inside of the tank; and / or,

[0029] The corrugations of the secondary shielding layer face outwards from the tank; and / or,

[0030] The corrugated plate of the secondary shielding layer includes a main body portion and an edge portion surrounding the main body portion. The edge portion is used to connect with the edge portion of another corrugated plate. The corrugations have protrusions and recesses. The recesses are disposed on the main body portion, and the protrusions are disposed on the edge portion. The protrusions are used to connect with the protrusions of another corrugated metal plate.

[0031] By setting protrusions and recesses in the longitudinal extension direction of the corrugated portion of the corrugated plate, and connecting the protrusions and recesses through a torsion joint, the original continuous circulation channel in the corrugated portion is blocked by the torsion structure at the "convex-concave" joint, thereby disrupting the conditions for stable convection of gas in the long continuous channel. This inhibits heat transfer, improves the thermal insulation performance of the cryogenic liquefied cargo system, effectively reduces the evaporation of LNG in the cryogenic liquefied cargo system, and thus reduces cargo loss and saves costs.

[0032] The present invention also provides a ship for transporting liquefied products, the ship comprising a hull and a liquefied gas storage tank as described above disposed in the hull.

[0033] A vessel includes a hull and a storage container as described above disposed within the hull.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. This invention enables the installation of the pump tower base by opening mounting holes on the flat surface of the main shielding layer, fully preserving the integrity of the corrugated structure of the main shielding layer, ensuring the expansion and contraction performance of the main shielding layer in low-temperature environments, eliminating the risk of sealing failure and media leakage caused by structural damage, and significantly improving the reliability of the low-temperature sealing of the storage tank.

[0036] 2. The secondary shielding layer adopts a localized optimized design with only a single corrugated closed end, taking into account both the rigidity of the base fixation and the expansion and contraction performance of the secondary shielding layer. The ratio of the corrugation spacing between the primary and secondary shielding layers is reasonable, adapting to the deformation requirements of different working temperatures. The overall stress distribution of the tank is uniform, resulting in a longer service life.

[0037] 3. The main shielding layer corrugations are arranged in an avoidance and through manner, which can be adapted to the base installation without cutting, simplifying the assembly process and improving production efficiency; the overall structural design is adapted to the ship transportation conditions, with strong stability, low operation and maintenance costs, and has a wide range of engineering application value. Attached Figure Description

[0038] Figure 1This is a schematic diagram of the structure of the liquefied gas storage tank in Embodiment 1 of the present invention;

[0039] Figure 2 This is a cross-sectional view of the liquefied gas loading and unloading tower base and the surrounding corrugated plates in Embodiment 1 of the present invention.

[0040] Figure 3 This is a three-dimensional schematic diagram of the liquefied gas loading and unloading tower base and the surrounding corrugated plates in Embodiment 1 of the present invention.

[0041] Figure 4 This is a first top view of the corrugated plate form surrounding the liquefied gas loading and unloading tower base in Embodiment 1 of the present invention;

[0042] Figure 5 This is a second top view of the corrugated plate form surrounding the liquefied gas loading and unloading tower base in Embodiment 1 of the present invention;

[0043] Figure 6 This is a third top view of the corrugated plate form surrounding the liquefied gas loading and unloading tower base in Embodiment 1 of the present invention;

[0044] Figure 7 This is a fourth top view of the corrugated plate form surrounding the liquefied gas loading and unloading tower base in Embodiment 1 of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of a special type of corrugated plate in Embodiment 1 of the present invention.

[0046] Figure 9 It is a cross-sectional view of the ship's tanks.

[0047] Explanation of reference numerals in the attached diagram: 1—Main shielding layer

[0048] 2-Secondary shielding layer

[0049] 3—Base

[0050] 11—First Ripple

[0051] 12—Second ripple

[0052] 13—Mounting Holes

[0053] 23—Third ripple

[0054] 24—Fourth ripple

[0055] 31—Lower part of the base body

[0056] 32—Upper part of the base body

[0057] 321—Through slot

[0058] 111—Main Body

[0059] 112—Edge section

[0060] 121—Protrusion

[0061] 122—Depression

[0062] 140—Torsion section

[0063] 5—Shell

[0064] 6—Liquefied gas storage tank. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0066] In the description of this invention, it should be understood that, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0067] Furthermore, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0070] Example 1

[0071] Please see the appendix Figure 1 - Appendix Figure 3 As shown, this embodiment provides a liquefied gas storage tank, including at least one top wall, a bottom wall, and a plurality of side walls extending between the top wall and the bottom wall. The liquefied gas storage tank includes a main shielding layer 1 that contacts the liquefied gas on one side, a secondary shielding layer 2 disposed on the other side of the main shielding layer 1, and at least one liquefied gas loading and unloading tower. The liquefied gas loading and unloading tower extends between the top wall and the bottom wall and includes a base 3 at the bottom; the base 3 includes:

[0072] The lower part 31 of the base body is fixedly connected to the bottom wall. The corrugated plate of the secondary shielding layer 2 is connected to the lower part 31 of the base body. The corrugated plate of the secondary shielding layer 2 includes a plurality of corrugations, and at least one of the corrugations has a closed end facing the lower part 31 of the base body. The corrugated plate is preferably made of a metallic material such as steel or aluminum alloy and is suitable for manufacturing storage containers, especially for cryogenic liquefied gas containment systems for storing liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, liquid hydrogen, and liquid helium in marine engineering equipment or land-based engineering equipment. The corrugated plate is processed from a flat metal plate, and its length and width can be between 0.3 meters and 3.6 meters. Those skilled in the art can process it according to actual needs. The corrugated plate includes a generally rectangular corrugated plate planar layer and corrugations formed on the corrugated plate planar layer.

[0073] The upper part 32 of the base body has mounting holes 13 on the main shielding layer 1, and the upper part 32 of the base body is fixedly connected to the lower part 31 of the base body through the mounting holes 13.

[0074] By opening mounting holes 13 in the main shielding layer 1, the upper part 32 of the base body passes through the mounting holes 13 and is fixedly connected to the lower part 31 of the base body. This does not damage the corrugated structure of the main shielding layer 1 or affect the continuity of the corrugations, thus maintaining the overall integrity of the main shielding layer 1 to the greatest extent. In this way, when the main shielding layer 1 comes into contact with low-temperature liquefied gas, it can ensure excellent thermal expansion and contraction performance and avoid stress concentration and structural cracking. The secondary shielding layer 2 has a relatively high operating temperature. The corrugated closed end is used at the connection with the pump tower base to ensure the stability of the pump tower base and meet the overall expansion and contraction performance of the secondary shielding layer 2.

[0075] like Figure 3 and Figure 4 As shown, in this embodiment, the corrugated plate of the main shielding layer 1 includes a plurality of first corrugations 11 extending along a first direction and a plurality of second corrugations 12 extending along a second direction, a knot formed by the intersection of the first corrugations 11 and the second corrugations 12, and a flat surface between the first corrugations 11 and the second corrugations 12; the mounting hole 13 is opened on the flat surface between the two first corrugations 11 and / or the two second corrugations 12.

[0076] Both the first and second corrugations are extended and intersect each other, forming an intersection section at the intersection point. The intersection section has a specific floral structure, which enhances the structural strength of the corrugated sheet at the intersection point, thus extending its service life. The first and second corrugations are orthogonal; however, it is understood that in other embodiments, they may also be obliquely intersecting. The number of first and second corrugations can be 1 to 12, depending on the overall size of the corrugated sheet. Of course, those skilled in the art can also set other numbers of first and second corrugations according to actual needs. The first and second corrugations together form a grid-like corrugated structure on the corrugated sheet, enabling the corrugated sheet to absorb thermal and mechanical stresses caused by temperature changes or internal pressure fluctuations in multiple directions. Preferably, the first and second corrugations have different widths and heights. The width of the corrugation mentioned here refers to the maximum horizontal dimension of the corrugation perpendicular to its longitudinal extension direction, and the height of the corrugation refers to the vertical distance between the highest point of the corrugation and the planar layer of the corrugated sheet.

[0077] Mounting holes 13 are formed on a flat surface between two first corrugations 11 and / or two second corrugations 12, avoiding the corrugation deformation area, further ensuring the normal expansion and contraction of the corrugations of the main shielding layer 1, and avoiding stress concentration around the mounting holes 13.

[0078] In one optional embodiment, the upper part 32 of the base body is provided with a plurality of through grooves 321, and at least two first corrugations 11 and at least two second corrugations 12 directly pass through the plurality of through grooves 321. Figure 4As shown, this is the mounting position on the main shielding layer 1 and the form of the first corrugated plate around it. The corrugations of the main shielding layer 1 can directly pass through several through slots 321 without cutting the corrugated structure, thus maximizing the preservation of the continuity and expansion and contraction capability of the corrugations of the main shielding layer 1.

[0079] In one alternative embodiment, at least two first corrugations 11 and at least two second corrugations 12 are deviated from their alignment to avoid the mounting position of the upper part 32 of the base body on the main shielding layer 1. Figure 5 As shown, this is the mounting position on the main shielding layer 1 and the form of the second corrugated plate around it. If the two first corrugations 11 and two second corrugations 12 of the main shielding layer 1 need to pass through the mounting position on the main shielding layer 1 of the upper part 32 of the base body, the corrugations can be deviated from their guideline to avoid the mounting position without cutting the corrugated structure, thus maximizing the preservation of the continuity and expansion and contraction capability of the corrugations of the main shielding layer 1.

[0080] In another alternative embodiment, two first corrugations 11 and two second corrugations 12 are connected on one side of the upper part 32 of the base body; as shown Figure 6 As shown, this is the mounting location on the main shielding layer 1 and the form of the third corrugated plate surrounding it. The first corrugation 11 and the second corrugation 12 are connected on adjacent sides of the upper part 32 of the base body. (See diagram) Figure 7 As shown, this illustrates the installation location on the main shielding layer 1 and the form of the fourth corrugated plate surrounding it. By changing the connection method of the corrugations, the installation location can be avoided while forming a complete corrugated deformation network, thus improving the overall uniformity of expansion and contraction of the main shielding layer 1.

[0081] In this embodiment, the corrugation spacing of the corrugated plate in the secondary shielding layer 2 is greater than that in the primary shielding layer 1. The corrugation spacing is adjusted to accommodate the different operating temperatures and expansion / contraction requirements of the primary and secondary shielding layers. The primary shielding layer 1 operates at a relatively lower temperature, so a smaller spacing corrugation with more corrugations is used to meet greater deformation requirements. The secondary shielding layer 2 operates at a relatively higher temperature, so a larger spacing corrugation not only meets deformation requirements but also improves structural rigidity. Preferably, the ratio of the corrugation spacing of the primary shielding layer 1 to that of the secondary shielding layer 2 is 2:3. In a preferred embodiment, the first corrugation spacing is 406 mm, and the second corrugation spacing is 609 mm. The ratio of 406 mm to 609 mm is 2:3. This size is suitable for large LNG carriers or large land-based storage tanks. The primary sealing membrane is in direct contact with the cryogenic liquid at -163°C, requiring denser corrugations to accommodate the intense thermal contraction; while the secondary sealing membrane is farther from the cold source, and the temperature gradient causes it to actually withstand a lower temperature. Therefore, using a larger spacing of 609 mm can still ensure sufficient expansion and contraction margin, while significantly reducing the number of grooves that need to be opened on the secondary insulation barrier.

[0082] In addition, the corrugated plate of the secondary shielding layer 2 includes multiple third corrugations 23 extending along the first direction and multiple fourth corrugations 24 extending along the second direction. The third corrugations 23 and the fourth corrugations 24 intersect to form a knot, and only one of the third corrugations 23 and the fourth corrugations 24 has a closed end facing the lower part 31 of the base body. The center of the base is located at the intersection of the guide lines of the third corrugation 23 with the closed end and the fourth corrugation 24 with the closed end.

[0083] The secondary shielding layer 2 operates at a relatively high temperature. It is interrupted only at the connection with the pump tower base by a single corrugated closed end. This ensures the connection stability of the pump tower base while preserving the overall expansion and contraction performance of the secondary shielding layer 2. It effectively solves the problems of sealing failure and structural damage caused by the base penetrating the shielding layer in the existing technology, and improves the overall service life and operational safety of the storage tank.

[0084] This embodiment does not limit the corrugation orientation of the primary and secondary shielding layers. Preferably, the corrugations of the primary shielding layer 1 face inwards from the tank, and the corrugations of the secondary shielding layer 2 face outwards from the tank. With this arrangement, the corrugations of the primary shielding layer 1 facing inwards from the tank can better withstand the impact force of the liquefied gas inside the tank, while the corrugations of the secondary shielding layer 2 facing outwards from the tank can effectively reduce gas flow on the outer side of the corrugations of the secondary shielding layer 2, thereby improving the overall thermal insulation performance of the cryogenic liquefied cargo system.

[0085] In addition, such as Figure 8 As shown, the corrugated plate of the secondary shielding layer 2 can also be a special type of corrugated plate; the corrugated plate of the secondary shielding layer 2 includes a main body portion 111 and an edge portion 112 surrounding the main body portion 111. The edge portion 112 is used to connect with the edge portion 112 of another corrugated plate. The corrugations have protrusions 121 and recesses 122. The recesses 122 are provided on the main body portion 111, and the protrusions 121 are provided on the edge portion 112. The protrusions 121 are used to connect with the protrusions 121 of another corrugated metal plate. By providing protrusions 121 and recesses 122 in the longitudinal extension direction of the corrugated portion of the corrugated plate, and connecting the protrusions 121 and recesses 122 through a torsion, the originally continuous circulation channel in the corrugated portion is blocked by the torsion structure at the "convex-concave" joint, thereby disrupting the conditions for stable convection of gas in the long continuous channel. This inhibits heat transfer and improves the thermal insulation performance of the cryogenic liquid cargo system.

[0086] In one embodiment, each of the third and fourth corrugations includes at least one protrusion 121 and at least one adjacent recess 122 in its longitudinal extension direction, rather than a single continuous protrusion or recess. Specifically, each of the third and fourth corrugations also includes a torsion 140 located at the junction of the protrusion 121 and the recess 122, for connecting the protrusion 121 and the recess 122 together in their respective longitudinal extension directions. The protrusion 121 protrudes towards the interior of the cryogenic cargo system relative to the corrugated plate plane layer, and the recess 122 is recessed away from the interior of the cryogenic cargo system relative to the corrugated plate plane layer. It should be noted that both "protrusion" and "recess" are relative to the interior of the cryogenic cargo system; "protrusion" means extending in a direction towards the interior of the cryogenic cargo system, and "recess" means extending in a direction towards the exterior of the cryogenic cargo system. This concave-convex design brings significant technical benefits. It breaks the limitation of the traditional corrugated plate having a single shape of corrugations along its entire length. By setting protrusions 121, recesses 122, and torsional parts 140 connecting the two in the longitudinal extension direction of the corrugations, the originally continuous channel is blocked by the "concave-convex" structure (i.e., the torsional part 140), thereby disrupting the conditions for stable convection of gas in a long continuous channel. This inhibits heat transfer, improves the thermal insulation performance of the cryogenic liquefied cargo system, effectively reduces LNG evaporation in the cryogenic liquefied cargo system, and reduces cargo loss.

[0087] Example 2

[0088] This embodiment also provides a ship, including a hull 5 and a liquefied gas storage tank 6 disposed in the hull 5 as described above.

[0089] refer to Figure 9 A cross-sectional view of a vessel used for transporting liquefied gas (LNG) products shows a liquefied gas storage tank 6, typically prismatic in shape, mounted within a double hull of the vessel. The walls of the LNG storage tank 6 may include a primary shielding layer 1 for contact with the LNG contained within the tank, a secondary shielding layer 2 disposed between the primary shielding layer 1 and the vessel's hull, and two insulating layers disposed between the primary shielding layer 1 and the secondary shielding layer 2, respectively, and between the secondary shielding layer 2 and the hull. Furthermore, a device / unloading pipe located on the upper deck of the vessel can be connected to an offshore or port terminal via suitable connectors to transfer LNG between the cargo ship and the tank.

[0090] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquefied gas storage tank, comprising at least one top wall, a bottom wall, and a plurality of side walls extending between the top wall and the bottom wall, the liquefied gas storage tank comprising a main shielding layer (1) in contact with liquefied gas on one side, a secondary shielding layer (2) disposed on the other side of the main shielding layer (1), and at least one liquefied gas loading and unloading tower, the liquefied gas loading and unloading tower extending between the top wall and the bottom wall, and including a base (3) at the bottom; characterized in that, The base (3) includes: The lower part (31) of the base body is fixedly connected to the bottom wall. The corrugated plate of the secondary shielding layer (2) is connected to the lower part (31) of the base body. The corrugated plate of the secondary shielding layer (2) includes several corrugations. At least one of the corrugations has a closed end at one end facing the lower part (31) of the base body. The upper part (32) of the base body has a mounting hole (13) on the main shielding layer (1), and the upper part (32) of the base body is fixedly connected to the lower part (31) of the base body through the mounting hole (13).

2. The liquefied gas storage tank as described in claim 1, characterized in that, The corrugated plate of the main shielding layer (1) includes a plurality of first corrugations (11) extending along a first direction and a plurality of second corrugations (12) extending along a second direction, a knot formed by the intersection of the first corrugations (11) and the second corrugations (12), and a flat surface between the first corrugations (11) and the second corrugations (12). The mounting hole (13) is formed on a flat surface between the two first corrugations (11) and / or the two second corrugations (12).

3. The liquefied gas storage tank as described in claim 2, characterized in that, The upper part (32) of the base body is provided with a plurality of through grooves (321), and at least two first corrugations (11) and at least two second corrugations (12) directly pass through the plurality of through grooves (321).

4. The liquefied gas storage tank as described in claim 2, characterized in that, At least two of the first corrugations (11) and at least two of the second corrugations (12) deviate from their alignment to avoid the mounting position of the upper part (32) of the base body on the main shielding layer (1).

5. The liquefied gas storage tank as described in claim 2, characterized in that, Two of the first corrugations (11) or two of the second corrugations (12) are connected on one side of the upper part (32) of the base body; and / or, The first corrugation (11) and the second corrugation (12) on adjacent sides of the upper part (32) of the base body are connected.

6. The liquefied gas storage tank as described in claim 1, characterized in that, The corrugated spacing of the corrugated plate of the secondary shielding layer (2) is greater than the corrugated spacing of the corrugated plate of the main shielding layer (1).

7. The liquefied gas storage tank as described in claim 1, characterized in that, The ratio of the corrugation spacing of the corrugated plate of the main shielding layer (1) to the corrugation spacing of the corrugated plate of the secondary shielding layer (2) is 2:

3.

8. The liquefied gas storage tank as described in claim 1, characterized in that, The corrugated plate of the secondary shielding layer (2) includes a plurality of third corrugations (23) extending along a first direction and a plurality of fourth corrugations (24) extending along a second direction. The third corrugations (23) and the fourth corrugations (24) intersect to form a knot, and only one of the third corrugations (23) and the fourth corrugations (24) has a closed end facing the lower part (31) of the base body. The center of the base is located at the intersection of the guide lines of the third corrugation (23) with a closed end and the fourth corrugation (24) with a closed end.

9. The liquefied gas storage tank as described in claim 1, characterized in that, The corrugations of the main shielding layer (1) face inwards towards the inside of the tank; and / or, The corrugations of the secondary shielding layer (2) face outwards from the tank; and / or, The corrugated plate of the secondary shielding layer (2) includes a main body portion (111) and an edge portion (112) disposed around the main body portion (111). The edge portion (112) is used to connect with the edge portion (112) of another corrugated plate. The corrugation has a protrusion (121) and a recess (122). The recess (122) is disposed on the main body portion (111), and the protrusion (121) is disposed on the edge portion (112). The protrusion (121) is used to connect with the protrusion (121) of another corrugated metal plate.

10. A ship for transporting liquefied gases, characterized in that, The vessel includes a hull and a liquefied gas storage tank as described in any one of claims 1 to 9 disposed within the hull.

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