Temporary installation structure of liquefied gas storage and transportation tank, liquefied gas storage and transportation tank and ship

Abstract

This invention discloses a temporary installation structure for a liquefied gas storage and transportation tank, the liquefied gas storage and transportation tank itself, and a vessel. The temporary installation structure is installed at the end of the liquefied gas storage and transportation tank near a temporary opening. The temporary installation structure includes a temporary insulation module, a metal skirt, and a corrugated sealing element. One end face of the temporary insulation module is attached to the opposite end face of a conventional insulation module of the insulation layer, and the support surface of the insulation layer is flush with the support surface of the temporary insulation module. The metal skirt has an L-shaped cross-section and is disposed on the support surface of the temporary insulation module. One end of the metal skirt is welded to the support structure, and the other end is welded to a flat area of ​​the corrugated metal plate near the temporary opening. The corrugated sealing element is welded to the corrugated portion of the corrugated metal plate and the metal skirt. By setting an L-shaped metal skirt and welding it to the flat area, combined with the corrugated sealing element sealing the corrugated portion, a double sealing structure covers the entire edge area of ​​the corrugated plate. The metal skirt has a groove to avoid the corrugated structure, improving the reliability of the tightness test.

Description

Technical Field

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

[0002] Cryogenic membrane tanks are large storage tank structures used to store 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 sealing layer, a main plywood layer, a secondary sealing layer, and an insulation box.

[0003] Temporary doors serve as the main entrances and exits for scaffolding, elevators, materials, and equipment during the construction phase of cryogenic membrane tanks. Once the overall construction of other areas within the cryogenic membrane tank is largely completed, and all large equipment, scaffolding, elevators, etc., have been removed from the tank, the temporary doors will be sealed. Before sealing the temporary doors, a leak test must be performed on all welded areas of the metal plates inside the tank. Current temporary door designs lack solutions for sealing the corrugated plates.

[0004] Therefore, there is a need to provide a temporary installation structure for a liquefied gas storage and transportation tank, a liquefied gas storage and transportation tank, and a ship for transporting liquefied gas, in order to at least partially solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a temporary installation structure for a liquefied gas storage and transportation tank and a ship for transporting liquefied gas, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a temporary installation structure for a liquefied gas storage and transportation tank, which is installed at the end of the liquefied gas storage and transportation tank near a temporary opening. The liquefied gas storage and transportation tank is arranged in a support structure and includes multiple tank walls. The multiple tank walls are connected to each other and fixed to the support structure. The multiple tank walls include at least one sealing membrane and at least one heat insulation layer. The sealing membrane is disposed on the support surface of the heat insulation layer. The sealing membrane includes multiple corrugated metal plates, which are juxtaposed in a repeating pattern and welded together in a sealed manner.

[0008] The temporary installation structure includes a temporary insulation module, a metal skirt, and a corrugated sealing component; one end face of the temporary insulation module is in contact with the opposite end face of the conventional insulation module of the insulation layer, and the support surface of the insulation layer is flush with the support surface of the temporary insulation module.

[0009] The metal skirt plate has an L-shaped cross-section and is disposed on the support surface of the temporary insulation module. One end of the skirt plate is welded to the support structure, and the other end is welded to the flat area of ​​the corrugated metal plate near the temporary opening. The corrugated sealing member is welded to the corrugated part of the corrugated metal plate and the metal skirt plate.

[0010] The flat areas and corrugations of the corrugated plate are sealed using a metal skirt and corrugated sealing components, respectively. The L-shaped metal skirt seals the corrugated plate to the supporting structure, forming a sealed space. The supporting surface of the temporary insulation module and the supporting surface of the insulation layer form a complete plane to support the sealing structure. The temporary installation structure achieves a seal at the edge of the corrugated plate near the temporary opening, ensuring the reliability of the tightness test, and is simple and efficient to install and remove.

[0011] Preferably, the temporary insulation module is bonded to the conventional insulation module of the insulation layer and / or the support structure.

[0012] Temporary insulation modules are bonded to conventional insulation modules and support structures using adhesive bonding. Compared to bolt fixing, this method eliminates the need for drilling, avoids damaging the integrity of the insulation layer, and prevents cold bridging and leakage. The adhesive bonding structure is easy to assemble and disassemble, leaves no residual damage after removal, does not affect the subsequent construction of permanent temporary door panels, and is reusable, reducing construction costs.

[0013] Preferably, the edge where the metal skirt is welded to the corrugated metal plate has a joint groove;

[0014] The corrugated sealing component also includes a flat area joint for welding to the flat areas on both sides of the corrugation and the joint groove;

[0015] The position of the groove corresponds to the position of the corrugations in the corrugated metal plate.

[0016] The corrugations of the corrugated metal plate extend into the mating groove, and the flat areas on both sides of the corrugations overlap and weld with the edge areas on both sides of the mating groove. The groove structure can precisely avoid the corrugated protrusions and accommodate the flat area of ​​the corrugated sealing component, so that the metal skirt fits the edge contour of the corrugated plate and the corrugated sealing component, eliminating welding gaps, improving welding sealing performance, preventing air leakage during airtightness testing, and providing high positioning accuracy for the concave-convex fit, thereby improving the efficiency of temporary sealing assembly and welding consistency.

[0017] Preferably, the sealing membrane includes a primary sealing membrane and a secondary sealing membrane, and the heat insulation layer includes a primary heat insulation layer and a secondary heat insulation layer.

[0018] The tank wall, in the thickness direction from the outside to the inside of the liquefied gas storage and transportation tank, includes: a secondary insulation layer fixed to the support structure; a secondary sealing membrane carried by the secondary insulation layer; a primary insulation layer carried by the secondary sealing membrane; and a primary sealing membrane carried by the primary insulation layer and for contact with the liquefied gas.

[0019] The temporary installation structure, extending from the outside to the inside of the liquefied gas storage tank in the thickness direction, includes: a secondary temporary insulation module bonded to the secondary insulation layer; a secondary metal skirt welded to the secondary sealing membrane; a primary temporary insulation module bonded to the primary insulation layer; and a primary metal skirt welded to the primary sealing membrane.

[0020] Preferably, the primary insulation layer comprises conventional plywood and unconventional plywood near the temporary opening;

[0021] The conventional plywood is used to support the flat areas of the corrugated metal sheet;

[0022] The unconventional plywood is used to support the flat area where the corrugated metal plate is welded to the primary metal skirt.

[0023] The dimensions of the unconventional plywood are smaller than those of the conventional plywood.

[0024] By cutting off the corrugations perpendicular to the temporary openings instead of parallel to them, unconventional plywood is used to support the cut-off corrugated sheets. The dimensions of the unconventional plywood used in conjunction with this are smaller than those of the conventional plywood.

[0025] Preferably, the primary temporary insulation module comprises temporary plywood;

[0026] The temporary plywood includes at least two protruding compensation portions; the protruding compensation portions are used to adhere to the unconventional plywood to form a support plane to support the primary sealing film and the primary metal skirt.

[0027] The protruding compensation section of the temporary plywood is bonded to the non-standard plywood to form a supporting plane that supports the primary sealing membrane and the primary metal skirt, filling the support gaps at the edges of temporary openings, eliminating steps and gaps in the insulation layer, ensuring a smooth and continuous supporting surface, increasing the contact area of ​​the plywood, dispersing welding stress in the metal membrane, avoiding localized hard contact that could cause membrane dents and deformation, and protecting the structural integrity of the sealing layer. The corrugations of the secondary sealing membrane extend into the groove between the two protruding compensation sections. The interlocking assembly structure is simple to position, allows for rapid on-site installation, shortens the temporary sealing construction cycle, and improves assembly accuracy.

[0028] Preferably, the support structure has an opening, the temporary mounting structure is arranged around the opening, and the metal skirt of the temporary mounting structure defines the temporary opening along the thickness direction of the tank wall.

[0029] Preferably, the corrugated metal plate is made of stainless steel;

[0030] The corrugated metal plate 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 corrugated structure of the same corrugated path on the metal plate has opposite corrugation protrusion directions in the main body portion and the edge portion.

[0031] The corrugated plate of the sealing membrane includes a main body and an edge portion surrounding the main body. The edge portion is used to connect with the edge portion of another corrugated plate. The corrugations are protruding corrugated structures in different directions relative to the planar layer of the metal plate. The corrugated structures on the metal plate along the same corrugated path have opposite protrusion directions on the main body and the edge portion. For example, the corrugations on the main body protrude towards the outside of the tank relative to the planar layer of the metal plate, while the corrugations on the edge portion protrude towards the inside of the tank relative to the planar layer of the metal plate, or vice versa.

[0032] By setting protrusions and recesses in the corrugated portion of the corrugated plate along the direction perpendicular to the wall thickness, 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 gas system, effectively reduces LNG evaporation in the cryogenic liquefied gas system, and thus reduces cargo loss and saves costs.

[0033] The present invention also provides a liquefied gas storage and transportation tank, including a temporary installation structure for the liquefied gas storage and transportation tank as described above.

[0034] The present invention also provides a ship for transporting liquefied gas, the ship comprising a hull and a liquefied gas storage and transport tank as described above disposed in the hull.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. Excellent sealing performance and high detection accuracy: The present invention is designed with an L-shaped metal skirt and a flat area welded together, and a corrugated sealing component to seal the corrugated part. The double sealing structure covers the entire edge area of ​​the corrugated plate. The metal skirt is provided with a groove to avoid the corrugated protrusion structure and fit the contour of the corrugated plate, eliminating the problem of air leakage in the airtightness test and greatly improving the reliability of the airtightness test.

[0037] 2. Non-destructive installation and strong protection: The temporary insulation module adopts an adhesive fixing method, abandoning the traditional bolt drilling fixing mode. There are no structural openings, and the insulation layer insulation structure is fully preserved, avoiding cold bridge and cold leakage defects. There is no residual damage after disassembly and assembly, and it does not affect the subsequent construction of temporary door permanent sealing panels.

[0038] 3. Precise and convenient positioning: The metal skirt panel has a groove for precise avoidance of the corrugated protrusions, conforms to the edge contour of the corrugated plate, effectively eliminates welding gaps, improves welding consistency and sealing performance, and avoids air leakage problems during airtightness testing; at the same time, the temporary plywood adopts a protruding compensation part concave-convex plug-in assembly structure, and the secondary sealing membrane corrugated is embedded in the groove between the protruding compensation parts, which is simple to position, has high assembly accuracy, simplifies the on-site installation process, and shortens the construction cycle.

[0039] 4. Heat insulation and energy saving, saving costs: The temporary structure can be reused, simplifying the disassembly and assembly process, shortening the construction cycle, and reducing the construction cost of the storage tank; the corrugated plate adopts a reverse corrugated structure to block the continuous convection channel of gas in the tank, suppress heat transfer, reduce LNG evaporation loss, and reduce storage and transportation damage. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention;

[0041] Figure 2 This is a structural schematic diagram of the temporary installation structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention, viewed from the inside of the storage and transportation tank.

[0042] Figure 3 This is a first side view of the temporary installation structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention;

[0043] Figure 4 This is a second side view of the temporary installation structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention;

[0044] Figure 5 for Figure 3 Cross-sectional view of detail A in the middle;

[0045] Figure 6 for Figure 3 A schematic diagram of detail B in the middle;

[0046] Figure 7 This is a schematic diagram of the corrugated sealing component of the temporary installation structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention.

[0047] Figure 8 This is a third side view of the temporary installation structure of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention;

[0048] Figure 9 for Figure 8 Cross-sectional view of detail C.

[0049] Figure 10 This is a schematic diagram of the corrugated plate of the liquefied gas storage and transportation tank in Embodiment 1 of the present invention.

[0050] Figure 11 This is a cross-sectional view of the tank of the ship in Embodiment 3 of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1—Support Structure

[0053] 2—Temporary opening

[0054] 3—Corrugated metal sheet

[0055] 4—Conventional Insulation Module

[0056] 5—Temporary Insulation Module

[0057] 51—Secondary Temporary Insulation Module

[0058] 6—Metal skirting board

[0059] 61—Secondary Metal Skirt

[0060] 62—Primary Metal Skirt

[0061] 7—Corrugated sealing components

[0062] 8—Matching groove

[0063] 9—Liquefied Gas Storage and Transportation Tanks

[0064] 10—Shell

[0065] 11—Secondary sealing membrane

[0066] 12—Primary sealing membrane

[0067] 21—Secondary Insulation Layer

[0068] 22—Primary Insulation Layer

[0069] 221—Conventional Plywood

[0070] 222—Unconventional Plywood

[0071] 223—Temporary Plywood

[0072] 2231—Protruding Compensation Section

[0073] 2232—Trough

[0074] 111—Main Body

[0075] 112—Edge section

[0076] 121—Protrusion

[0077] 122—Depression

[0078] 140—Twist section. Detailed Implementation

[0079] 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.

[0080] In the description of this invention, it should be understood that, unless otherwise stated, the terms "center," "perpendicular to the wall thickness direction," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this invention.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Example 1

[0085] Please see the appendix Figure 1 As shown, this embodiment provides a liquefied gas storage and transportation 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. A temporary opening is provided on one of the side walls, which is the main inlet and outlet for scaffolding, elevators, materials, and equipment during the construction phase of the liquefied gas storage and transportation tank.

[0086] Please see the appendix Figure 2-5 As shown, this embodiment provides a temporary installation structure for a liquefied gas storage and transportation tank. The structure is installed at the end of the liquefied gas storage and transportation tank near the temporary opening 2. The support structure 1 has an opening, and the temporary installation structure is arranged around the opening. The metal skirt 6 of the temporary installation structure defines the temporary opening 2 along the thickness direction of the tank wall. The liquefied gas storage and transportation tank is arranged in the support structure 1 and includes multiple tank walls. The multiple tank walls are connected to each other and fixed to the support structure 1. Each tank wall includes at least one sealing membrane and at least one heat insulation layer. The sealing membrane is disposed on the support surface of the heat insulation layer. The sealing membrane includes multiple corrugated metal plates 3, which are juxtaposed in a repeating pattern and welded together in a sealed manner.

[0087] The temporary installation structure includes a temporary insulation module 5, a metal skirt 6, and a corrugated sealing component 7. One end face of the temporary insulation module 5 is attached to the opposite end face of the conventional insulation module of the insulation layer, and the support surface of the insulation layer is flush with the support surface of the temporary insulation module 5. The metal skirt 6 has an L-shaped cross-section and is set on the support surface of the temporary insulation module 5. One end of the metal skirt 6 is welded to the support structure 1, and the other end is welded to the flat area of ​​the corrugated metal plate 3 near the temporary opening 2. The corrugated sealing component 7 is welded to the corrugated part of the corrugated metal plate 3 and the metal skirt 6.

[0088] The flat areas and corrugations of the corrugated plate are sealed by the metal skirt 6 and the corrugated sealing element 7, respectively. The L-shaped metal skirt 6 seals the corrugated plate to the support structure 1 to form a sealed space. The support surface of the temporary insulation module 5 and the support surface of the insulation layer form a complete plane to support the sealing structure. The temporary installation structure achieves sealing of the edge of the corrugated plate near the temporary opening 2, ensuring the reliability of the tightness test, and is simple and efficient to install and remove.

[0089] In this embodiment, the temporary insulation module 5 is bonded to the conventional insulation module and support structure 1 of the insulation layer. The temporary insulation module 5 is fixed to the conventional insulation module and support structure 1 by bonding, which eliminates the need for drilling compared to bolt fixing, thus avoiding damage to the integrity of the insulation structure and preventing cold bridging and leakage defects. The bonded structure is easy to assemble and disassemble, leaves no residual damage after removal, does not affect the subsequent construction of the temporary door permanent sealing panel, and is reusable, reducing construction costs.

[0090] It should be noted that, Figure 5 for Figure 3 Cross-sectional view of detail A in the middle. Figure 5 The corrugations are the corrugations on the corrugated plate at the far end of the cross-section where it connects with the metal skirt plate; the metal skirt plate itself does not have corrugations.

[0091] like Figure 6 As shown, in this embodiment, the edge of the metal skirt plate 6 welded to the corrugated metal plate 3 has a mating groove 8; the position of the mating groove 8 corresponds to the position of the corrugations of the corrugated metal plate 3. The corrugations of the corrugated metal plate 3 extend into the mating groove 8, and the flat areas on both sides of the corrugations overlap and weld with the edge areas on both sides of the mating groove 8; the groove structure can precisely avoid the corrugated protrusion structure, so that the metal skirt plate 6 fits the edge contour of the corrugated plate and the corrugated sealing component 7, eliminating welding gaps, improving welding sealing performance, preventing air leakage during airtightness testing, and achieving high positioning accuracy for the concave-convex fit, thereby improving the efficiency of temporary sealing assembly and welding consistency. Figure 7 As shown, in actual engineering, the size of the corrugated plug 7 is slightly larger than the size of the corrugation and has a flat area joint 71 to achieve mutual welding. The size of the joint groove 8 matches the flat area joint 71 of the corrugated plug 7 to accommodate the flat area joint 71 of the corrugated plug 7. The interior of the joint groove 8 is welded to the corrugated plug 7, and the edge areas on both sides of the joint groove 8 overlap and weld with the flat areas on both sides of the corrugation.

[0092] Please see the appendix Figure 8-9As shown, in one optional embodiment, the sealing membrane includes a primary sealing membrane 12 and a secondary sealing membrane 11, and the insulation layer includes a primary insulation layer 22 and a secondary insulation layer 21. The tank wall, in the thickness direction from the outside to the inside of the liquefied gas storage and transportation tank, includes: a secondary insulation layer 21 fixed to the support structure 1; a secondary sealing membrane 11 carried by the secondary insulation layer 21; a primary insulation layer 22 carried by the secondary sealing membrane 11; and a primary sealing membrane 12 carried by the primary insulation layer 22 and used for contact with the liquefied gas. The temporary installation structure, in the thickness direction from the outside to the inside of the liquefied gas storage and transportation tank, includes: a secondary temporary insulation module 51 fitted to the secondary insulation layer 21; a secondary metal skirt 61 welded to the secondary sealing membrane 11; a primary temporary insulation module fitted to the primary insulation layer 22; and a primary metal skirt 62 welded to the primary sealing membrane 12. The corrugations of the primary sealing membrane 12 near the temporary opening are sealed by end caps to achieve a tight seal.

[0093] Preferably, the primary insulation layer 22 includes a conventional plywood 221 and an unconventional plywood 222 near the temporary opening 2; the conventional plywood 221 is used to support the flat area of ​​the corrugated metal plate 3; the unconventional plywood 222 is used to support the flat area of ​​the corrugated metal plate 3 welded to the primary metal skirt 62; the size of the unconventional plywood 222 is smaller than the size of the conventional plywood 221. Before setting up the temporary installation structure, the corrugated plate at the temporary opening needs to be cut. In this embodiment, the corrugations perpendicular to the temporary opening 2 are cut off, rather than the corrugations parallel to the temporary opening 2. The unconventional plywood 222 is used to support the cut corrugated plate, and the size of the unconventional plywood 222 is smaller than the size of the conventional plywood 221.

[0094] The primary temporary insulation module includes a temporary plywood 223; the temporary plywood 223 includes at least two protruding compensation portions 2231; the protruding compensation portions 2231 are used to fit with the non-conventional plywood 222 to form a supporting plane supporting the primary sealing membrane 12 and the primary metal skirt 62. The protruding compensation portions 2231 of the temporary plywood 223 fit with the non-conventional plywood 222 to form a supporting plane supporting the primary sealing membrane 12 and the primary metal skirt 62, filling the support gap at the edge of the temporary opening 2, eliminating steps and gaps in the insulation layer, ensuring a smooth and continuous supporting surface, increasing the contact area of ​​the plywood, dispersing the welding stress of the metal membrane, avoiding local hard contact that could cause membrane depression or deformation, and protecting the structural integrity of the sealing layer. The corrugations of the secondary sealing membrane 11 extend into the groove 2232 between the two protruding compensation portions 2231. The concave-convex plug-in assembly structure is simple to position, allows for rapid on-site installation, shortens the temporary sealing construction cycle, and improves assembly accuracy.

[0095] It should be noted that, Figure 9 for Figure 8 Cross-sectional view of detail C in the middle. Figure 9The corrugations are the corrugations on the corrugated plate at the far end of the cross section where it connects with the primary metal skirt plate; the primary metal skirt plate itself does not have corrugations.

[0096] In this embodiment, the corrugated metal plate is made of stainless steel; such as Figure 10 As shown, the corrugated plate of the sealing membrane can also be a special type of corrugated plate; the corrugated plate of the sealing membrane 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 direction perpendicular to the wall thickness of the corrugated portion of the corrugated plate, and connecting the protrusions 121 and recesses 122 through a torsion 140, 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 liquefied gas system.

[0097] When using this special type of corrugated plate, before setting up a temporary installation structure, the corrugated plate at the temporary opening needs to be cut off, and the protruding part 121 and the twisted part 140 at the edge are cut off. Corrugated sealing parts 7 need to be set in the opposite direction to seal the recessed part 122, and then the flat areas on both sides of the recessed part are sealed with a metal skirt.

[0098] In one embodiment, each of the intersecting corrugations of the corrugated metal plate includes at least one protrusion 121 and at least one adjacent recess 122 in its direction of extension perpendicular to the wall thickness, rather than a single continuous protrusion or recess. Specifically, each corrugation 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 the direction of extension perpendicular to the wall thickness of the third and fourth corrugations, respectively. The protrusion 121 protrudes towards the interior of the cryogenic liquefied gas system relative to the flat area of ​​the corrugated plate, while the recess 122 is recessed away from the interior of the cryogenic liquefied gas system relative to the flat area of ​​the corrugated plate. It should be noted that both "protrusion" and "recess" are relative to the interior of the cryogenic liquefied gas system; "protrusion" means extending in a direction towards the interior of the cryogenic liquefied gas system, and "recess" means extending in a direction towards the exterior of the cryogenic liquefied gas 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 direction of the corrugations extending perpendicular to the wall thickness, the originally continuous channel is blocked by the "concave-convex" structure, i.e., the torsional part 140. This disrupts the conditions for stable convection of gas in a long continuous channel, which inhibits heat transfer, improves the thermal insulation performance of the cryogenic liquefied gas system, effectively reduces LNG evaporation in the cryogenic liquefied gas system, and reduces cargo loss.

[0099] Example 2

[0100] This embodiment provides a liquefied gas storage and transportation tank, including the temporary installation structure of the liquefied gas storage and transportation tank as described above.

[0101] Example 3

[0102] This embodiment provides a ship, including a hull 10 and a liquefied gas storage and transportation tank 9 disposed in the hull 10 as described above.

[0103] refer to Figure 11 A cross-sectional view of a vessel used for transporting liquefied gas shows a liquefied gas storage tank 9, typically prismatic in shape, mounted within the hull 10 of the vessel. The wall of the liquefied gas storage tank 9 may include a primary sealing membrane for contact with the LNG contained within the tank, a secondary sealing membrane disposed between the primary sealing membrane and the hull of the vessel, and two insulating layers disposed between the primary and secondary sealing membranes, respectively, and between the secondary sealing membrane 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.

[0104] 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 temporary installation structure for a liquefied gas storage and transportation tank, installed at the end of the liquefied gas storage and transportation tank near a temporary opening (2), the liquefied gas storage and transportation tank being arranged in a support structure (1) and comprising a plurality of tank walls, the plurality of tank walls being connected to each other and fixed to the support structure (1), the plurality of tank walls comprising at least one sealing membrane and at least one heat insulation layer, the sealing membrane being disposed on the support surface of the heat insulation layer, the sealing membrane comprising a plurality of corrugated metal plates (3), the corrugated metal plates (3) being juxtaposed in a repeating pattern and welded together in a sealed manner; characterized in that, The temporary installation structure includes a temporary insulation module (5), a metal skirt (6), and a corrugated sealing component (7); one end face of the temporary insulation module (5) is attached to the opposite end face of the conventional insulation module (4) of the insulation layer, and the support surface of the insulation layer is flush with the support surface of the temporary insulation module (5). The metal skirt plate (6) has an L-shaped cross section and is set on the support surface of the temporary insulation module (5). One end of the skirt plate (6) is welded to the support structure (1), and the other end is welded to the flat area of ​​the corrugated metal plate (3) near the temporary opening (2). The corrugated sealing member (7) is welded to the corrugated part of the corrugated metal plate (3) and the metal skirt plate (6).

2. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 1, characterized in that, The temporary insulation module (5) is bonded to the conventional insulation module (4) of the insulation layer and / or the support structure (1).

3. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 1, characterized in that, The metal skirt (6) has a joint groove (8) at the edge where it is welded to the corrugated metal plate (3). The corrugated sealing member (7) also includes a flat area joint (71) for welding with the flat areas on both sides of the corrugation and the joint groove (8); The position of the groove (8) corresponds to the position of the corrugations of the corrugated metal plate (3).

4. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 1, characterized in that, The sealing membrane includes a primary sealing membrane (12) and a secondary sealing membrane (11), and the heat insulation layer includes a primary heat insulation layer (22) and a secondary heat insulation layer (21). The tank wall, in the thickness direction from the outside to the inside of the liquefied gas storage and transportation tank, includes: a secondary insulation layer (21) fixed to the support structure (1); a secondary sealing membrane (11) carried by the secondary insulation layer (21); a primary insulation layer (22) carried by the secondary sealing membrane (11); and a primary sealing membrane (12) carried by the primary insulation layer (22) and used for contact with the liquefied gas. The temporary installation structure includes, in the thickness direction from the outside to the inside of the liquefied gas storage tank: a secondary temporary insulation module (51) attached to the secondary insulation layer (21); a secondary metal skirt (61) welded to the secondary sealing membrane (11); a primary temporary insulation module attached to the primary insulation layer (22); and a primary metal skirt (62) welded to the primary sealing membrane (12).

5. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 4, characterized in that, The primary insulation layer (22) includes conventional plywood (221) and unconventional plywood (222) near the temporary opening (2). The conventional plywood (221) is used to support the flat area of ​​the corrugated metal plate (3); The unconventional plywood (222) is used to support the flat area where the corrugated metal plate (3) is welded to the primary metal skirt (62); The dimensions of the unconventional plywood (222) are smaller than those of the conventional plywood (221).

6. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 5, characterized in that, The primary temporary insulation module includes temporary plywood (223). The temporary plywood (223) includes at least two protruding compensation portions (2231); the protruding compensation portions (2231) are used to fit with the unconventional plywood (222) to form a support plane to support the primary sealing film (12) and the primary metal skirt (62).

7. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 1, characterized in that, The support structure (1) has an opening, the temporary installation structure is arranged around the opening, and the metal skirt (6) of the temporary installation structure defines the temporary opening (2) along the thickness direction of the tank wall.

8. The temporary installation structure for the liquefied gas storage and transportation tank according to claim 1, characterized in that, The corrugated metal plate (3) is made of stainless steel; The corrugated metal plate 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 corrugated structure of the same corrugated path on the metal plate has opposite corrugated protrusion directions in the main body portion and the edge portion.

9. A liquefied gas storage and transportation tank, characterized in that, A temporary installation structure for a liquefied gas storage and transportation tank as described in any one of claims 1 to 8.

10. A ship for transporting liquefied gases, characterized in that, The vessel includes a hull and a liquefied gas storage and transport tank as described in claim 9 disposed within the hull.

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