Method for mounting membrane-type containment system carrying cryogenic liquid cargo

Abstract

The embodiments of the present disclosure provide a method for mounting a membrane-type containment system carrying cryogenic liquid cargo. A membrane-type containment system comprises a primary membrane layer, fastening engagement plates, a primary insulation layer, a secondary membrane layer and a secondary insulation layer, which are sequentially connected and fixed to a hull structure by means of penetrating fasteners, wherein the primary membrane layer, the primary insulation layer, the secondary membrane layer and the secondary insulation layer enclose to form a cryogenic liquid cargo storage tank for containing an ultra-low-temperature medium. In a planar area, the method comprises: mounting spacer plates on a bulkhead of the hull structure according to set marked lines, and mounting secondary insulation modules on the spacer plates; performing fixation by means of the penetrating fasteners; after mounting is completed, mounting the secondary membrane layer and primary insulation modules in sequence; then mounting each fastening engagement plate disposed above a gap formed by two adjacent primary insulation modules; and mounting the primary membrane layer, wherein the boundary of each primary membrane is welded and fixed to fixing welding plates and sealing metal pieces provided on the fastening engagement plates disposed on the primary insulation modules.

Description

Installation method of a membrane containment system for carrying cryogenic liquid cargo

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311521364.X filed on November 14, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure relates to the technical field of equipment design for transporting and storing cryogenic liquids, and in particular to a method for installing a membrane-type containment system for carrying cryogenic liquid cargo. Background Art

[0004] When transporting gases like natural gas and ethane over long distances, it's common to cool the gas to low temperatures and transport it as a liquefied form for more economical long-distance transportation. This liquefied gas significantly reduces its volume, lowering transportation costs. The liquefied cryogenic liquid is stored and transported using specialized cryogenic liquid containment systems.

[0005] In the current shipbuilding industry, cryogenic liquid cargo containment systems primarily involve the construction of LNG vessels. For LNG vessels, the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) defines four main types of containment systems: Type A, Type B, Type C, and membrane. Membrane containment systems are widely used due to their advantages, including high tank capacity utilization, excellent thermal insulation, and reduced wind resistance.

[0006] The existing membrane containment system technologies mainly include Mark III and NO 96, both of which are from the French company GTT. However, both containment systems have their own shortcomings. For the NO 96, since its main and secondary insulation modules are arranged in an overlapping manner, the gaps between the main insulation modules and the gaps between the secondary insulation modules are directly connected to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, there is still a large amount of heat leakage in the gaps. For the Mark III, since the main insulation modules, secondary insulation modules and secondary membranes are fixed to each other with glue and fixed to the hull structure with epoxy resin, the relative movement between the main and secondary insulation modules is restricted, and the overall resistance to hull movement and liquid cargo sloshing is poor. In addition, the large amount of glue used leads to a long construction period. Due to the strict requirements on the construction environment (humidity and temperature) and process, the delivery of the entire ship is delayed.

[0007] Summary of the Invention

[0008] In view of the above-mentioned problems existing in the prior art, an embodiment of the present disclosure provides an installation method of a film-type containment system for carrying low-temperature liquid cargo, wherein the film-type containment system is used to accommodate ultra-low temperature media, and includes a main film layer, a fastening card plate, a main insulation layer, a secondary film layer and a secondary insulation layer, which are sequentially connected and fixed to the hull structure (hull steel plate) through through fasteners. The main layer shielding space is formed by utilizing the internal gap of the main insulation layer and the gap between the main insulation layer and the main film layer, and the secondary shielding space is formed by utilizing the internal gap of the secondary insulation layer and the gap between the secondary insulation layer and the secondary film layer. The film-type containment system installed using the above-mentioned installation method effectively builds a double-layer sealed ultra-low temperature medium storage carrier, solving the storage and leakage prevention problems of ultra-low temperature media.

[0009] The present disclosure provides an installation method for a membrane-type containment system for carrying cryogenic liquid cargo. The membrane-type containment system is used to accommodate ultra-low temperature media, and includes a primary membrane layer, a fastening plate, a primary insulating layer, a secondary membrane layer, and a secondary insulating layer, which are sequentially connected and fixed to a hull structure via through-fasteners. The primary membrane layer, the primary insulating layer, the secondary membrane layer, and the secondary insulating layer together form a cryogenic liquid cargo storage tank for accommodating ultra-low temperature media. In a plane area of ​​the membrane-type containment system, the installation method includes:

[0010] Installing distance plates on the bulkhead of the hull structure according to the set markings, and installing secondary insulation modules on the distance plates, wherein the secondary insulation modules in the plane area are all arranged in a rectangular shape;

[0011] After the secondary insulation module is mounted on the spacer, it is fixed by means of through-fasteners, wherein a welding base for fixing the through-fasteners is welded at a corresponding position of the hull structure where the through-fasteners are provided;

[0012] After the secondary insulation layer is installed, the secondary film layer is installed. The secondary film in the secondary film layer is made of a flexible sealing material that meets low-temperature resistance conditions. In the flat area, the secondary film layer includes multiple secondary films with preset sizes connected in a splicing manner. Each secondary film is bonded and fixed to the top plate of the secondary insulation module.

[0013] After the secondary film layer is installed, the main insulation modules are installed. In the flat area, each main insulation module is compressed and connected with the upper parts of six through-fasteners. The six through-fasteners are respectively located at the four corners and the midpoints of the two long sides of the main insulation module arranged in a rectangular structure. After the four main insulation modules corresponding to the same corner are placed, the compression structure of the corresponding through-fasteners is installed at the corner.

[0014] A fastening card is installed on the upper part of the gap formed by two adjacent main insulation modules, and the fastening card has a cross-shaped structure or a straight-shaped structure;

[0015] After the fastening card is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films with preset sizes connected in a splicing manner. The boundary of each main layer film is welded and fixed to the fixed welding plate or sealing metal sheet on the fastening card provided on the main insulation module.

[0016] In some embodiments of the present disclosure, installing a distance plate on a bulkhead of a hull structure according to a set marking line includes:

[0017] Marking the bulkhead of the hull structure, welding studs perpendicular to the bulkhead at positions on the bulkhead for placing the distance plates according to the markings, and installing the distance plates sleeved on the studs, wherein four through holes are provided at four corners of the distance plates symmetrically about the center line of the distance plates, and a stud is passed through each through hole;

[0018] Each stud on the distance plate corresponds to a corner of four different and adjacent secondary insulation modules. Among them, the secondary insulation modules in the plane area are provided with distance bolt holes at the four corners. The distance bolt holes are used to accommodate the studs set on the distance plate and the fastening nuts threadedly connected to the studs.

[0019] In some embodiments of the present disclosure, a nut is contained in the welding base, a metal connecting rod passing through the fastener is passed through the mounting and fixing hole in the middle of the secondary insulation module, and the cap rod structure passing through the upper part of the fastener is screwed and fixed to the metal connecting rod, and the lower part of the fastener is used to anchor the secondary insulation module in the plane area.

[0020] In some embodiments of the present disclosure, the bottom metal plate of the clamping structure of the through-fastener is pressed on the middle plates of four adjacent main insulation modules in the same corner area, and the bottom metal plate of the clamping structure of the through-fastener arranged at the midpoint of the long side of two adjacent main insulation modules is pressed on the middle plates of the adjacent main insulation modules, and the clamping structures are respectively fixedly connected and locked to the upper end of the metal connecting rod.

[0021] In some embodiments of the present disclosure, the cross center of the cross-shaped fastening card and the straight center of the straight line fastening card are both provided with a sealing metal sheet and an installation fixing hole for setting a through fastener, and the four long sides of the cross-shaped fastening card and the two long sides of the straight line fastening card are both fixed with a fixed welding plate for welding and fixing to the main film layer.

[0022] In some embodiments of the present disclosure, the boundary of each main layer film is welded and fixed to a fixed welding plate or a sealing metal sheet on a fastening card plate provided on the main insulation module, specifically including: fixing the first main layer film installed on the welding plate to the fixed welding plate or the sealing metal sheet by intermittent spot welding, overlapping the main layer film adjacent to the first main layer film on the first main layer film, sealingly welding the overlapping part along the entire edge line, and welding the boundary of the main layer film on the sealing metal sheet in the through hole in the middle position of the fastening card plate to the sealing metal sheet, and welding the upper end metal sealing cap of the upper part of the through fastener to the sealing metal sheet to achieve sealing of the entire main layer film layer.

[0023] In some embodiments of the present disclosure, the distance plate is made of plywood or a plastic alternative material that meets the stiffness requirements, and the thickness is set to at least one of 1mm, 2mm, 5mm or 10mm. The distance plate is used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom plate of the secondary insulation module and the bulkhead is 10mm; the aperture of the through hole on the distance plate is larger than the outer diameter of the thread on the stud 0.5mm-2mm.

[0024] In some embodiments of the present disclosure, the bottom plate provided at the bottom surface of the secondary insulation module close to the distance plate is rectangular, and openings for installing studs are provided at the four corners. The aperture of the opening on the bottom plate is larger than the outer diameter of the thread on the stud by 0.5mm-2mm.

[0025] In some embodiments of the present disclosure, during the installation of the secondary insulation module on the upper part and top of the bulkhead, after the secondary insulation module and the distance plate are installed, a lifting device is required for temporary stabilization, and after the cap rod structure passing through the upper part of the fastener and the metal connecting rod are tightened and fixed, the lifting device is removed.

[0026] In some embodiments of the present disclosure, the fastening card is made of plywood or an alternative material that meets the stiffness requirements, and the thickness of the card ranges from 6mm to 15mm; a circular sealing metal sheet installation groove with a diameter of 60mm to 120mm and a depth of 1.5mm to 3mm is formed at the upper end of the installation and fixing hole on the fastening card, and a sealing metal sheet with a center hole matching the groove size is embedded in the groove.

[0027] In some embodiments of the present disclosure, the main insulation layer includes a plurality of main insulation modules that are spaced apart and distributed in a matrix manner, and the first gap between two adjacent main insulation modules is filled with flexible insulation material; wherein, the main insulation module in the plane area has a rectangular structure, and each main insulation module includes a first top plate, an upper insulation block, a middle plate and a lower insulation block fixedly connected from top to bottom in sequence, and the first top plate is provided with a through-type stress relief seam according to the structure of the main film layer covering it, and the upper insulation block is provided with a non-through-type stress relief seam that is aligned with the stress relief seam provided on the first top plate.

[0028] In some embodiments of the present disclosure, the secondary insulation layer includes a plurality of secondary insulation modules that are spaced apart and distributed in a matrix, and the second gap between two adjacent secondary insulation modules is filled with a flexible thermal insulation material.

[0029] In some embodiments of the present disclosure, the secondary insulation module in the planar layer is a rectangular structure, and each secondary insulation module includes a second top plate, a cross reinforcement structure and a bottom plate fixedly connected in sequence from top to bottom. An insulation block is provided between the second top plate and the bottom plate. The insulation block is fixed in the space formed by the second top plate, the bottom plate and the cross reinforcement structure, and the insulation block has the same size and shape as the space. The cross center of the cross reinforcement structure is provided with an installation and fixing hole for installing a through fastener. The second top plate and the bottom plate are both provided with installation and fixing holes corresponding to the installation and fixing holes on the cross reinforcement structure. The second top plate is bonded and fixed to the sub-layer film in the sub-layer film layer.

[0030] In some embodiments of the present disclosure, the space between the primary film layer and the secondary film layer forms a primary shielding space, and the space between the secondary film layer and the hull structure forms a secondary shielding space, and both the primary shielding space and the secondary shielding space are filled with inert protective gas.

[0031] Compared with the prior art, the beneficial effect of the installation method of a membrane-type enclosure system for carrying low-temperature liquid cargo provided by the embodiment of the present disclosure is that: the main and secondary insulation modules are arranged in an staggered manner, so that the first gap and the second gap are also arranged in an staggered manner, reducing the overall heat leakage at the gap; at the same time, the use of glue is greatly reduced, the construction period is shortened, and the construction environment (humidity and temperature) and process requirements are lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a cross-sectional schematic diagram of a membrane-type containment system in a method for installing a membrane-type containment system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0033] FIG2 is a three-dimensional exploded view of a membrane-type containment system in an installation method of a membrane-type containment system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0034] FIG3 is a three-dimensional exploded view of a main insulation module of a membrane-type enclosure system in an installation method of a membrane-type enclosure system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0035] FIG4 is a three-dimensional exploded view of a secondary insulation module of a membrane-type enclosure system in an installation method of a membrane-type enclosure system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0036] FIG5 is a schematic diagram of a secondary insulation module of a membrane-type enclosure system in an installation method of a membrane-type enclosure system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0037] FIG6 is a three-dimensional exploded view of a straight-line fastening plate of a membrane-type containment system in an installation method of a membrane-type containment system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0038] FIG7 is a three-dimensional exploded view of a cross-shaped fastening plate of a membrane-type containment system in an installation method of a membrane-type containment system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0039] FIG8 is a three-dimensional exploded view of a through-fastener of a membrane-type containment system in an installation method of a membrane-type containment system for carrying cryogenic liquid cargo provided by an embodiment of the present disclosure;

[0040] Reference numerals

[0041] 1-through fastener, 2-secondary insulation layer, 3-secondary film layer, 4-main insulation layer, 5-main film layer, 6-fastening card, 7-resin strip, 8-distance plate, 9-second gap, 10-first gap, 11-main film, 12-cross-shaped fastening card, 13-straight fastening card, 14-main insulation module, 15-secondary film, 16-secondary insulation module, 17-first top plate, 18-through stress relief seam, 19-upper insulation block, 20-non-through stress relief seam, 21-through fastener installation notch, 22-middle plate, 23-fixing pad, 24-lower insulation block, 25-second top plate, 26 -Insulation block, 27-cross reinforcement structure, 28-bottom plate, 29-installation fixing hole, 30-distance bolt hole, 31-strip card plate, 32-sealing metal sheet, 33-sealing metal sheet mounting groove, 34-fixed welding plate mounting groove, 35-fixed welding plate, 36-welding base, 37-nut, 38-metal connecting rod, 39-cut thread, 40-connecting metal sheet, 41-cap rod structure, 42-bottom metal plate of pressure block, 43-disc spring, 44-locking cap, 45-locking plate, 46-bridge block, 47-spring, 48-long bolt, 49-top metal plate of pressure block, 50-gasket, 51-double-headed screw, 52-metal sealing cap. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0044] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0045] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features of the claims and are therefore within the scope of protection defined thereby.

[0046] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0047] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0048] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0049] An embodiment of the present disclosure provides an installation method for a membrane-type containment system for carrying cryogenic liquid cargo. As shown in Figures 1 to 8, the membrane-type containment system is used to accommodate ultra-low temperature media, and includes a primary membrane layer 5, a fastening card plate 6, a primary insulating layer 4, a secondary membrane layer 3, and a secondary insulating layer 2, which are sequentially connected and fixed to the hull structure via a through-fastener 1. The primary membrane layer 5, the primary insulating layer 4, the secondary membrane layer 3, and the secondary insulating layer 2 enclose a cryogenic liquid cargo containment system for accommodating ultra-low temperature media. At the same time, the space between the primary membrane layer 5 and the secondary membrane layer 3 is used to form a primary shielding space, and the space between the secondary membrane layer 3 and the hull structure (bulkhead) is used to form a secondary shielding space. In a plane area of ​​the membrane-type containment system, the installation method includes the following steps, specifically as follows:

[0050] Before installing the secondary insulation module, it is necessary to mark the bulkhead of the hull structure, weld studs set perpendicular to the bulkhead at the position on the bulkhead for placing the distance plate 8 according to the marking, and install the distance plate 8 mounted on the studs, wherein the four corners of the distance plate 8 are symmetrically arranged about the center line of the distance plate 8 with four through holes, and a stud is passed through each through hole.

[0051] The through fastener 1 includes: an upper section and a lower section, the upper section includes a cap rod structure 41, a clamping structure, a double-headed screw 51 and a metal sealing cap 52, the clamping structure includes a bottom metal plate 42 of a pressure block, a disc spring 43, a locking cap 44, a locking plate 45, a bridge block 46, four springs 47, four long bolts 48, a top metal plate 49 of a pressure block, and four gaskets 50; the lower section includes a welding base 36 and a nut 37 contained in the welding base 36, a metal connecting rod 38 and a chamfered thread 39 provided at the upper end of the metal connecting rod 38, wherein the clamping structure is provided at the upper part of the main insulation module 14 In the installation notch opened on the insulation block 19, the lower part of the clamping structure fits with the fixed pad 23, and the cap rod structure 41 passes through the connecting metal sheet 40 and is connected and fixed with the chamfered thread 39 of the metal connecting rod 38, and the connecting metal sheet 40 is fixed to the secondary film 15 at the corresponding position, and the cap rod structure 41 locks the clamping structure; the welding base 36 of the through-fastener 1 is welded at the corresponding position of the hull structure where the through-fastener 1 is placed, and the welding base contains a nut 37, and the metal connecting rod 38 of the through-fastener 1 is installed on the welding base 36 through the nut 37, and the metal connecting rod 38 is passed through the installation and fixing hole 29 set on the cross reinforcement structure 27 of the secondary insulation module 16.

[0052] Each stud on the distance plate 8 corresponds to a corner of four different and adjacent secondary insulation modules 16, wherein the secondary insulation modules 16 in the plane area are provided with distance bolt holes 30 at the four corners, and the distance bolt holes 30 are used to accommodate the studs provided on the distance plate 8 and the fastening nuts threadedly connected to the studs; wherein, each secondary insulation module 16 includes a second top plate 25, a cross reinforcement structure 27 and a bottom plate 28 fixedly connected from top to bottom, the second top plate 25 is located at the top of each component in the secondary insulation module 16, and is a rectangular plate. At the same time, each secondary insulation module 16 also includes four insulation blocks 26, the second top The plate 25 is bonded and fixed to the sub-layer film 15 in the sub-layer film layer 3, and the cross reinforcement structure 27 is located below the second top plate 25, and its periphery coincides with the second top plate 25. At the same time, the cross reinforcement structure 27 and the second top plate 25 can be connected by glue or rivets. The bottom plate 28 is located below the cross reinforcement structure 27. The size and shape of the bottom plate 28 are the same as those of the second top plate 25, and the periphery coincides with the cross reinforcement structure 27 and the second top plate 25. The bottom plate 28 is connected to the cross reinforcement structure 27 with glue or rivets. An insulation block 26 is provided between the second top plate 25 and the bottom plate 28, and the insulation block 26 is fixed. It is located in the space formed by the second top plate 25, the bottom plate 28 and the cross reinforcement structure 27, and the insulation block 26 has the same size and shape as the space, that is, the size and shape of the insulation block 26 can be determined according to the size and shape of the space formed by the periphery of the second top plate 25 and the bottom plate 28 and the cross reinforcement structure 27. At the same time, the insulation block 26 should fill the entire space and overlap with the periphery of the second top plate 25, the bottom plate 28 and the cross reinforcement structure 27. The contact points between the insulation block 26 and the second top plate 25, the bottom plate 28 and the cross reinforcement structure 27 are all connected and fixed with glue. The cross center of the cross reinforcement structure 27 is provided with a In order to install the through-fasteners, the second top plate 25 and the bottom plate 28 are provided with mounting and fixing holes 29 corresponding to the mounting and fixing holes 29 on the cross reinforcement structure 27; that is, the secondary insulation module 16 with a rectangular structure is formed with a mounting and fixing hole 29 for installing and fixing the through-fastener 1 in the center of the rectangular parallelepiped along the thickness direction. At the same time, the bottom plate 28 is also provided with an opening concentrically arranged with the distance bolt hole 30, and the second top plate 25 and the insulation block 26 are provided with a distance bolt hole 30 concentrically arranged with the through hole and with a hole diameter 2-4 times the hole diameter of the through hole, thereby facilitating the gasket, fastening nut and tooling tool to lock the distance plate.Furthermore, after the studs on the four secondary insulation modules around each distance plate 8 are tightened by nuts, the distance bolt holes 30 opened on each secondary insulation module 16 are filled with plungers made of the same material as the insulation block, so that each secondary insulation module 16 can be interconnected, which plays an auxiliary anchoring role for each secondary insulation module 16.

[0053] In this embodiment, the distance plate 8 is made of plywood or a plastic alternative material that meets the rigidity requirements, and the thickness is set to at least one of 1 mm, 2 mm, 5 mm or 10 mm. The distance plate is used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom plate 28 of the secondary insulation module 16 and the bulkhead is 10 mm; the aperture of the through hole on the distance plate 8 is larger than the outer diameter of the thread on the stud by 0.5-2 mm.

[0054] After the secondary insulation module 16 is installed on the distance plate 8, the through fastener 1 is installed, and the metal connecting rod 38 of the through fastener 1 is passed through the installation and fixing hole 29 in the middle of the secondary insulation module 16, and the cap rod structure 41 of the upper part of the through fastener 1 (specifically, the cylindrical cap provided by the cap rod structure 41 of the upper part) is screwed and fixed to the metal connecting rod 38. The connection of the lower part of the through fastener 1 plays a major anchoring role for each secondary insulation module 16 in the plane area. At the same time, the use of the distance plate 8, the resin strip 7 and the lower part of the through fastener 1 can effectively anchor the secondary insulation layer 2 of the entire enclosure system to the inner bulkhead.

[0055] In this embodiment, during the installation of the secondary insulation module 16 on the upper part and top of the bulkhead, after the secondary insulation module 16 and the distance plate 8 are installed, a lifting device is required for temporary stabilization, and after the cap rod structure 41 passing through the upper part of the fastener 1 is tightened and fixed with the metal connecting rod 38, the lifting device is removed.

[0056] Furthermore, in this embodiment, the bottom plate 28 of the secondary insulation module 16 has four corners with openings for mounting studs, each of which has a diameter larger than the outer diameter of the thread on the stud by 0.5 mm to 2 mm.

[0057] After the secondary insulating layer 2 is installed, the secondary film layer 3 is installed, and the plurality of secondary films 15 with the second preset size connected in a splicing manner are bonded and fixed to the second top plate 25 of the secondary insulating module 16 respectively.

[0058] The secondary insulating layer 2 includes a plurality of secondary insulating modules 16 that are spaced apart and arranged in a matrix pattern. The second gaps 9 between two adjacent secondary insulating modules 16 are filled with material.

[0059] When the main film layer 5 leaks, the secondary film layer 3 can absorb the ultra-low temperature medium through the secondary film layer 3, avoiding the safety risks caused by the contact between the hull structure and the ultra-low temperature medium. The secondary film 15 is made of a flexible sealing material that meets the low temperature resistance conditions.

[0060] After completing the installation of the secondary film layer 3, the main insulation module 14 is installed. The main insulation layer 4 includes a plurality of main insulation modules 14 that are spaced apart and arranged in a matrix. The first gap 10 between two adjacent main insulation modules 14 is filled with flexible insulation material. The main insulation module 14 in the plane area is a rectangular parallelepiped structure. The main insulation layer 4 is used to support and insulate the main film layer 5. Among them, the main insulation module 14 in the plane layer is a rectangular parallelepiped structure. Each main insulation module includes a first top plate 17, an upper insulation block 19, a middle plate 22 and a lower insulation block 24 that are fixedly connected from top to bottom. The first top The plate 17 is located at the top of each component in the main insulation module 14. It is a rectangular plate. It is provided with a through-type stress relief seam 18 according to the structure of the main layer film 11 covered thereon. The upper insulation block 19 is located below the first top plate 17. It is also a rectangular plate. It is fixedly connected to the first top plate 17 by glue. The upper insulation block 19 is provided with a non-through-type stress relief seam 20 aligned with the through-type stress relief seam 18 provided on the first top plate 17. The rectangular area of ​​the upper insulation block 19 is larger than that of the first top plate 17. The first top plate 17 is located in the middle of the rectangle of the upper insulation block 19. Specifically, It is located at the center of the rectangle of the upper insulation block 19, and the middle plate 22 and the lower insulation block 24 arranged at the lower part of the upper insulation block 19 are the same size as the upper insulation block 19. The middle plate 22 is fixedly connected to the upper insulation block 19 by glue and completely overlaps with the upper insulation block 19. The lower insulation block 24 is fixedly connected to the middle plate 22 by glue and completely overlaps with the middle plate 22. The four vertices and midpoints of the long sides of the upper insulation block 19 and the lower insulation block 24 arranged in a rectangular structure are provided with through-fastener installation notches 21 for installing through-fasteners. The installation notches on the upper insulation block 19 and the lower insulation block 24 are The shapes and sizes of the installation notches are the same. The middle plate 22 is provided with fixed pads 23 at the four vertices and the midpoints of the long sides of the rectangle. The portion of the fixed pad 23 in the lower insulation block 24 is adapted to the shape of the through-fastener installation notch 21 on the lower insulation block 24. That is, the shape and size of the fixed pad 23 are consistent with the shape and size of the through-fastener installation notch 21 of the lower insulation block 24, and can fill the installation notch formed on the lower insulation block 24. The portion where the fixed pad 23 contacts the lower insulation block 24 is fixed by glue. Finally, the above-mentioned main insulation module 14 is formed by using two layers of non-metallic plates and two layers of thermal insulation materials.

[0061] Furthermore, combined with the structure of the above-mentioned main insulation module 14, it can be known that in the plane area, each main insulation module 14 is compressed and connected with the upper parts of the six through fasteners 1, and the six through fasteners 1 are respectively arranged at the four corners and the midpoints of the two long sides of the main insulation module 14 arranged in a rectangular structure; after the four main insulation modules 14 corresponding to the same corner are placed, the corresponding compression structure of the through fastener 1 is installed at the corner, and the bottom metal plate 42 of the compression block of the compression structure is pressed on the middle plate 22 of the four adjacent main insulation modules 14. At the same time, the bottom metal plate 42 of the compression block of the compression structure of the through fastener 1 arranged at the midpoint of the long side of two adjacent main insulation modules 14 is pressed on the middle plate 22 of the adjacent main insulation modules 14, and the compression structures are respectively fixedly connected and locked with the upper end of the metal connecting rod.

[0062] The fastening card plate 6 is installed on the upper part of the gap formed by the two adjacent main insulating modules 14. The fastening card plate 6 is a cross-shaped structure or a straight-line structure. That is, the fastening card plate 6 includes a cross-shaped fastening card plate 12 and a straight-line fastening card plate 13, and is made of a non-metallic plate that is easy to process and has low-temperature resistance. The upper surface of the fastening card plate 6 is in contact with the main layer film layer 5, and is provided with a fixed welding plate mounting groove 34 for welding the fixed welding plate 35 with the main layer film 11 and a fixing welding plate mounting groove 34 for mounting the fixing welding plate 35. The sealing metal sheet mounting groove 33 of the sealing metal sheet 32, specifically, the four long sides of the cross-shaped fastening card 12 and the two long sides (strip card 31) of the straight-line fastening card 13 are fixed with fixed welding plates 35 for welding and fixing to the main layer film 11; at the same time, the cross center of the cross-shaped fastening card 12 and the straight center of the straight-line fastening card 13 are both provided with mounting and fixing holes 29 for setting the through fastener 1, thereby facilitating the installation and fixing of the through fastener 1. As an example, the fastening card 6 is made of plywood or an alternative material that meets the rigidity requirements, and the card thickness ranges from 6mm to 15mm; the upper end of the mounting and fixing hole 29 provided on the fastening card 6 is formed with a circular sealing metal sheet mounting groove 33 with a diameter of 60mm-120mm and a depth of 1.5mm-3mm, and the groove is embedded with a sealing metal sheet 32 ​​with a center hole that matches the groove size.

[0063] After the fastening card plate 6 is installed, the main layer film layer 5 is installed, and the boundaries of each main layer film 11 are welded and fixed to the fixed welding plate 35 or the sealing metal sheet 32 ​​on the fastening card plate 6 provided on the main insulation module 14, specifically including: fixing the first main layer film 11 installed on the welding plate to the fixed welding plate 35 or the sealing metal sheet 32 ​​by intermittent spot welding, overlapping the main layer film 11 adjacent to the first main layer film 11 on the first main layer film 11, sealingly welding the overlapping part along the entire edge line, and welding the boundary of the main layer film 11 on the sealing metal sheet 32 ​​in the through hole in the middle position of the fastening card plate 6 to the sealing metal sheet 32, and welding the upper end metal sealing cap 52 of the upper part of the through fastener 1 to the sealing metal sheet 32 ​​to achieve sealing of the entire main layer film layer 5.

[0064] In this embodiment, the main film 11 of the main film layer 5 is made of Invar steel or 304L stainless steel that is prefabricated into a predetermined corrugated shape.

[0065] In this embodiment, the boundary of each main layer film 11 is welded and fixed to the fixed welding plate 35 or the sealing metal sheet 32 ​​on the fastening card 6 provided on the main insulation module 14, specifically including: fixing the first main layer film 11 installed on the welding plate to the fixed welding plate 35 or the sealing metal sheet 32 ​​by intermittent spot welding, overlapping the main layer film 11 adjacent to the first main layer film 11 on the first main layer film 11, sealingly welding the overlapping part along the entire edge line, and welding the boundary of the main layer film 11 on the sealing metal sheet 32 ​​in the through hole in the middle position of the fastening card 6 to the sealing metal sheet 32, and welding the upper end metal sealing cap 52 of the upper part of the through fastener 1 to the sealing metal sheet 32 ​​to achieve sealing of the entire main layer film layer 5.

[0066] In the above embodiment, the space between the main film layer 5 and the secondary film layer 3 forms a main shielding space, and the space between the secondary insulation layer 2 and the hull structure forms a secondary shielding space. Both the main shielding space and the secondary shielding space are filled with inert protective gas. At the same time, temperature sensors and combustible gas sensors are respectively installed in the main shielding space and the secondary shielding space to detect whether there is leakage of ultra-low temperature medium.

[0067] In the above embodiment, the first top plate 17, the middle plate 22, the second top plate 25, the cross reinforcement structure 27 and the bottom plate 28 are all made of low-temperature resistant non-metallic materials with a set strength, wherein the low-temperature resistant non-metallic materials can at least withstand a temperature of minus 196 degrees Celsius and have a strength greater than or equal to 4.0 MPa.

[0068] At the same time, the upper insulation block, the lower insulation block, and the insulation block positions are all made of materials that meet the set thermal conductivity requirements, wherein the set thermal conductivity requirements are that the thermal conductivity is not greater than 0.1W / (m·K).

[0069] The above embodiments are merely exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. The scope of protection of the present disclosure is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present disclosure within the essence and scope of protection of the present disclosure, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present disclosure.

Claims

1. A method for installing a membrane containment system for carrying cryogenic liquid cargo, wherein: The membrane type enclosure system is used to accommodate ultra-low temperature medium, and includes a main membrane layer, a fastening card plate, a main insulation layer, a secondary membrane layer and a secondary insulation layer which are sequentially connected and fixed to the hull structure through penetrating fasteners. The main membrane layer, the main insulation layer, the secondary membrane layer and the secondary insulation layer enclose a cryogenic liquid cargo storage tank for accommodating ultra-low temperature medium. In the plane area of ​​the membrane type enclosure system, the installation method includes: Installing distance plates on the bulkhead of the hull structure according to the set marking lines, and installing the secondary insulation modules on the distance plates, wherein the secondary insulation modules in the plane area are all arranged in a rectangular shape; After the secondary insulation module is mounted on the distance plate, it is installed and fixed by a through fastener, wherein a welding base for fixing the through fastener is welded at a corresponding position of the hull structure where the through fastener is provided; After the secondary insulation layer is installed, the secondary film layer is installed. The secondary film in the secondary film layer is made of a flexible sealing material that meets the low temperature resistance condition. In the plane area, the secondary film layer includes a plurality of secondary films with preset sizes connected in a splicing manner, and each secondary film is bonded and fixed to the top plate provided on the secondary insulation module; After the installation of the secondary film layer is completed, the main insulation module is installed. In the plane area, each main insulation module is compressed and connected with the upper parts of six through-fasteners. The six through-fasteners are respectively arranged at the four corners and the midpoints of the two long sides of the main insulation module arranged in a rectangular structure; after the four main insulation modules corresponding to the same corner are arranged, the compression structure of the corresponding through-fastener is installed at the corner; A fastening card plate is installed on the upper part of the gap formed by two adjacent main insulation modules, wherein the fastening card plate is in a cross-shaped structure or a straight-shaped structure; After the fastening card is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films with preset sizes connected in a splicing manner. The boundary of each main layer film is welded and fixed to the fixed welding plate or sealing metal sheet on the fastening card provided on the main insulation module.

2. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 1, wherein: The step of installing the distance plate on the bulkhead of the hull structure according to the set marking line comprises: Marking the bulkhead of the hull structure, welding studs arranged perpendicular to the bulkhead at positions on the bulkhead for placing the distance plates according to the markings, and installing the distance plates sleeved on the studs, wherein four through holes are arranged symmetrically about the center line of the distance plates at four corners of the distance plates, and a stud is passed through each through hole; Each stud on the distance plate corresponds to a corner of four different and adjacent secondary insulation modules, wherein The secondary insulation modules in the plane area are all provided with distance bolt holes at four corners, and the distance bolt holes are used to accommodate studs arranged on the distance plates and fastening nuts threadedly connected to the studs.

3. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 2, wherein: The welding base contains a nut, the metal connecting rod of the through-fastener is inserted into the installation and fixing hole in the middle of the secondary insulation module, and the cap rod structure of the upper part of the through-fastener is screwed and fixed to the metal connecting rod, and the lower part of the through-fastener is used to anchor the secondary insulation module in the plane area.

4. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 3, wherein: The bottom metal plate of the clamping structure of the through-fastener is pressed on the middle plates of four adjacent main insulation modules in the same corner area, and the bottom metal plate of the clamping structure of the through-fastener arranged at the midpoint of the long sides of two adjacent main insulation modules is pressed on the middle plates of the adjacent main insulation modules, and the clamping structures are respectively fixedly connected and locked to the upper ends of the metal connecting rods.

5. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 4, wherein: The cross center of the cross-shaped fastening card and the straight center of the straight-line fastening card are both provided with sealing metal sheets and installation and fixing holes for setting the through fasteners. The four long sides of the cross-shaped fastening card and the two long sides of the straight-line fastening card are both fixed with fixed welding plates for welding and fixing to the main film layer.

6. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 5, wherein: The boundary of each main layer film is welded and fixed to a fixed welding plate or a sealing metal sheet on a fastening card plate provided on the main insulation module, specifically including: The first main layer film installed on the welding plate is fixed to the fixed welding plate or the sealing metal sheet by intermittent spot welding. The main layer film adjacent to the first main layer film is overlapped on the first main layer film, and the overlapping part is sealed and welded along the entire edge line. The boundary of the main layer film on the sealing metal sheet overlapped on the through hole in the middle position of the fastening card is welded to the sealing metal sheet, and the upper end metal sealing cap of the upper part of the through fastener is welded to the sealing metal sheet to achieve sealing of the entire main layer film layer.

7. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 6, wherein: The distance plate is made of plywood or a plastic alternative material that meets the rigidity requirements, and the thickness is set to at least one of 1mm, 2mm, 5mm or 10mm. The distance plate is used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom plate of the secondary insulation module and the bulkhead is 10mm; the diameter of the through hole on the distance plate is larger than the outer diameter of the thread on the stud by 0.5mm-2mm.

8. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 7, wherein: The bottom plate arranged at the bottom surface of the secondary insulation module near the distance plate is rectangular, and has four corners. Openings for installing studs are provided at all locations, and the diameter of the openings on the bottom plate is 0.5mm-2mm larger than the outer diameter of the thread on the stud.

9. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 8, wherein: During the installation of the secondary insulation module on the upper part and top of the bulkhead, after the secondary insulation module and the distance plate are installed, a lifting device is required for temporary stabilization, and after the cap rod structure penetrating the upper part of the fastener is tightened and fixed with the metal connecting rod, the lifting device is removed.

10. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 9, wherein: The fastening card is made of plywood or an alternative material that meets the stiffness requirements, and the thickness of the card is in the range of 6mm-15mm; a circular sealing metal sheet installation groove with a diameter of 60mm-120mm and a depth of 1.5mm-3mm is formed at the upper end of the installation and fixing hole on the fastening card, and a sealing metal sheet with a center hole matching the groove size is embedded in the sealing metal sheet installation groove.

11. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 10, wherein: The main insulating layer includes a plurality of main insulating modules that are spaced apart and arranged in a matrix pattern, and a first gap between two adjacent main insulating modules is filled with a flexible thermal insulation material; wherein the main insulating module in the plane area is a rectangular structure, and each main insulating module includes a first top plate, an upper insulation block, a middle plate and a lower insulation block that are fixedly connected in sequence from top to bottom, and the first top plate is provided with a through-type stress release seam according to the structure of the main thin film layer covering it, and the upper insulation block is provided with a non-through-type stress release seam that is aligned with the stress release seam provided on the first top plate.

12. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 11, wherein: The secondary insulating layer comprises a plurality of secondary insulating modules which are spaced apart and arranged in a matrix distribution, and the second gap between two adjacent secondary insulating modules is filled with a flexible thermal insulation material.

13. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 12, wherein: The secondary insulation module in the plane layer is a rectangular structure, and each secondary insulation module includes a second top plate, a cross reinforcement structure and a bottom plate fixedly connected in sequence from top to bottom. An insulation block is provided between the second top plate and the bottom plate. The insulation block is fixed in the space formed by the second top plate, the bottom plate and the cross reinforcement structure, and the insulation block has the same size and shape as the space. A mounting and fixing hole for installing a through fastener is provided at the cross center of the cross reinforcement structure. The second top plate and the bottom plate are both provided with mounting and fixing holes corresponding to the mounting and fixing holes on the cross reinforcement structure. The second top plate is bonded and fixed to the secondary film in the secondary film layer.

14. A method for installing a membrane containment system for carrying cryogenic liquid cargo according to claim 13, wherein: The space between the primary film layer and the secondary film layer forms a primary shielding space, and the space between the secondary film layer and the hull structure forms a secondary shielding space. Both the primary shielding space and the secondary shielding space are filled with inert protective gas.

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