Method of installing a membrane type containment system for low temperature liquid cargo

Abstract

The embodiment of the present application provides a kind of installation method of low temperature liquid cargo bearing film type containment system, film type containment system includes main layer film layer, fastening card, main layer insulation layer, secondary layer film layer and secondary layer insulation layer sequentially connected and fixed to ship structure by through fastener, main layer film layer, main layer insulation layer, secondary layer film layer and secondary layer insulation layer are enclosed to form a low temperature liquid cargo storage tank for accommodating ultra-low temperature medium, in plane area, above-mentioned method includes installing fixed distance plate on the bulkhead of ship structure according to setting line, and installing secondary insulation module on fixed distance plate, fixed by through fastener, after installation is completed, secondary layer film layer and main insulation module are sequentially installed, fastening card arranged in the upper part of the gap formed by two adjacent main insulation modules is then installed, and main layer film layer is installed, and the boundary of each main layer film is welded and fixed with fixed welding plate and sealing metal sheet on fastening card arranged on main insulation module.

Description

Technical Field

[0001] This invention relates to the field of equipment design technology for transporting and storing cryogenic liquids, and in particular to an installation method for a membrane-type enclosure system for carrying cryogenic liquid cargo. Background Technology

[0002] When transporting gases such as natural gas and ethane, liquefaction is typically achieved by cooling the gases to cryogenic temperatures for more economical long-distance transport. Liquefaction significantly reduces the gas volume, lowering transportation costs. The liquefied cryogenic liquid is stored and transported using specialized cryogenic cargo containment systems.

[0003] In the current shipbuilding industry, cryogenic liquid cargo containment systems are mainly involved in the construction of LNG ships. For LNG ships, the International Code for the Construction and Equipment of Liquefied Gas Ships (IGC Code) defines four categories of containment systems: Type A, Type B, Type C, and membrane containment systems. Among them, membrane containment systems are widely used due to their advantages such as high cargo space utilization, good insulation performance, and small area exposed to wind resistance.

[0004] Existing membrane-type containment systems mainly include the Mark III and NO 96 types, both originating from the French company GTT. However, both systems have their own shortcomings. For the NO 96 type, because its primary and secondary insulation modules are arranged in an overlapping manner, the gaps between the primary and secondary insulation modules directly connect to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, significant heat leakage still exists. For the Mark III type, because the primary, secondary, and secondary insulation modules are all glued together and fixed to the hull structure with epoxy resin, the relative movement between the primary and secondary insulation modules is restricted, resulting in poor overall resistance to hull movement and liquid cargo sloshing. In addition, the extensive use of glue leads to a long construction period, and the strict requirements for the construction environment (humidity and temperature) and procedures delay the delivery of the entire vessel. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the present invention provides an installation method for a membrane-type enclosure system for carrying cryogenic liquid cargo. The membrane-type enclosure system is used to contain cryogenic media and includes a main membrane layer, a fastening plate, a main insulating layer, a secondary membrane layer, and a secondary insulating layer, which are sequentially connected and fixed to the hull structure (hull steel plate) by through fasteners. The main shielding space is formed by the internal gap of the main insulating layer and the gap between the main insulating layer and the main membrane layer, and the secondary shielding space is formed by the internal gap of the secondary insulating layer and the gap between the secondary insulating layer and the secondary membrane layer. The membrane-type enclosure system installed by the above installation method effectively builds a double-sealed cryogenic media storage carrier, solving the problems of cryogenic media storage and leakage prevention.

[0006] This invention provides an installation method for a membrane-type containment system for carrying cryogenic liquid cargo. The membrane-type containment system is used to contain cryogenic media and includes a main membrane layer, a fastening plate, a main insulating layer, a secondary membrane layer, and a secondary insulating layer, which are sequentially connected and fixed to the hull structure via through fasteners. The main membrane layer, main insulating layer, secondary membrane layer, and secondary insulating layer enclose and form a cryogenic liquid cargo tank for containing cryogenic media. The installation method within the planar area of ​​the membrane-type containment system includes:

[0007] Spacer plates are installed on the bulkheads of the hull structure according to the set lines, and secondary insulation modules are installed on the spacer plates. The secondary insulation modules in the planar area are all rectangular.

[0008] After the secondary insulation module is installed onto the spacer plate, it is fixed by through fasteners. Welding bases for fixing the through fasteners are welded at the corresponding positions of the hull structure where the through fasteners are provided.

[0009] 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 requirements of low temperature resistance. In the planar area, the secondary film layer includes multiple secondary films with preset dimensions connected by splicing. Each secondary film is bonded and fixed to the top plate of the secondary insulation module.

[0010] After the installation of the secondary thin film layer is completed, the main insulation modules are installed. In the planar area, each main insulation module is pressed and connected to the upper part 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, which is arranged in a cuboid structure. After the four main insulation modules corresponding to the same corner are placed, the corresponding through fastener pressing structure is installed at the corner.

[0011] Fastening plates are installed on the upper part of the gap formed by two adjacent main insulation modules. The fastening plates are either cross-shaped or straight.

[0012] After the fastening plate is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films of preset size connected by splicing. The boundary of each main layer film is welded and fixed to the fixing welding plate or sealing metal sheet on the fastening plate on the main insulation module.

[0013] In some embodiments of the present invention, a spacer plate is installed on the bulkhead of the hull structure according to a predetermined marking line, including:

[0014] Lines are drawn on the bulkhead of the hull structure. Based on the lines, studs are welded perpendicular to the bulkhead at the positions where spacer plates are placed on the bulkhead, and spacer plates are installed on the studs. The spacer plates have four through holes symmetrically arranged at their four corners about the center line of the spacer plates, and a stud is inserted into each through hole.

[0015] Each stud on the spacer plate corresponds to one corner of four different and adjacent secondary insulation modules. The secondary insulation modules in the planar area all have spacer bolt holes at the four corners. The spacer bolt holes are used to accommodate the studs that pass through the spacer plate and the fastening nuts that are threaded to the studs.

[0016] In some embodiments of the present invention, the welding base contains a nut, a metal connecting rod through the fastener passes through the mounting hole in the middle of the secondary insulation module, and the cap 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 planar area.

[0017] In some embodiments of the present invention, the bottom metal plate of the clamping structure of the through fastener is pressed on the middle plate of four adjacent main insulation modules in the same corner area, and the bottom metal plate of the clamping structure of the through fastener provided at the midpoint of the long side of two adjacent main insulation modules is pressed on the middle plate of the adjacent main insulation modules. The clamping structures are respectively fixedly connected to and locked to the upper end of the metal connecting rod.

[0018] In some embodiments of the present invention, the center of the cross-shaped fastening plate and the center of the straight fastening plate are provided with a sealing metal sheet and a mounting hole for providing through fasteners. The four long strips of the cross-shaped fastening plate and the two long strips of the straight fastening plate are all fixed with a fixing welding plate for welding and fixing to the main film layer.

[0019] In some embodiments of the present invention, the boundary of each main layer film is welded and fixed to a fixing welding plate or sealing metal sheet on a fastening plate disposed on the main insulation module, specifically including:

[0020] The first main layer film mounted 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 overlaps the first main layer film. The overlap part is sealed by welding along the entire edge. The boundary of the main layer film on the sealing metal sheet that overlaps the middle of the fastening plate is welded to the sealing metal sheet. The upper end of the metal sealing cap of the upper part of the fastener is welded to the sealing metal sheet to achieve the sealing of the entire main layer film layer.

[0021] In some embodiments of the present invention, the spacer plate is made of plywood or a plastic substitute material that meets the rigidity requirements, and the thickness is set to at least one of 1mm, 2mm, 5mm or 10mm. The spacer plate is used for leveling. By using spacer plates of different thicknesses to stack and combine, the distance between the bottom plate of the secondary insulation module and the bulkhead is 10mm. The diameter of the through hole on the spacer plate is 0.5-2mm larger than the outer diameter of the thread on the stud.

[0022] In some embodiments of the present invention, the bottom plate located on the bottom surface of the secondary insulation module near the spacer plate is rectangular, and openings for mounting studs are provided at the four corners. The diameter of the openings on the bottom plate is 0.5-2 mm larger than the outer diameter of the thread on the stud.

[0023] In some embodiments of the present invention, during the installation of the secondary insulation modules on the upper part and top of the bulkhead, after the secondary insulation modules and the spacer plate are installed, a lifting device is required for temporary stabilization. After the cap rod structure of the upper part of the through fastener is tightened and fixed to the metal connecting rod, the lifting device is removed.

[0024] In some embodiments of the present invention, the fastening plate is made of glued laminated wood or a substitute material that meets the rigidity requirements, and the thickness of the plate ranges from 6mm to 15mm; a circular sealing metal plate mounting groove with a diameter of 60-120mm and a depth of 1.5-3mm is formed at the upper end of the mounting and fixing hole on the fastening plate, and a sealing metal plate with a central hole matching the groove size is embedded in the groove.

[0025] In some embodiments of the present invention, the main insulation layer includes multiple main insulation modules spaced apart and arranged in a matrix, and the first gap between two adjacent main insulation modules is filled with flexible thermal insulation material; wherein, the main insulation module in the planar area has a cuboid structure, and each main insulation module includes a first top plate, an upper thermal insulation block, a middle plate and a lower thermal insulation block fixedly connected from top to bottom, the first top plate is provided with a through-type stress relief seam according to the structure of the main layer film layer covering it, and the upper thermal insulation block is provided with a non-through-type stress relief seam aligned with the stress relief seam provided on the first top plate.

[0026] In some embodiments of the present invention, the secondary insulation layer includes a plurality of secondary insulation modules spaced apart and arranged in a matrix, and the second gap between two adjacent secondary insulation modules is filled with flexible thermal insulation material.

[0027] In some embodiments of the present invention, the secondary insulation module in the planar layer has a cuboid structure. Each secondary insulation module includes a second top plate, a cross-shaped reinforcing structure, and a bottom plate that are fixedly connected 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-shaped reinforcing structure. The insulation block has the same size and shape as the space. The center of the cross of the cross-shaped reinforcing structure is provided with an installation and fixing hole for installing a through fastener. The second top plate and the bottom plate are provided with installation and fixing holes that correspond to the installation and fixing holes on the cross-shaped reinforcing structure. The second top plate is bonded and fixed to the secondary film in the secondary film layer.

[0028] In some embodiments of the present invention, the space between the primary thin film layer and the secondary thin film layer forms a primary shielding space, and the space between the secondary thin 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.

[0029] Compared with the prior art, the beneficial effects of the installation method of the membrane-type enclosure system for carrying cryogenic liquid cargo provided by the embodiments of the present invention are as follows: the main and secondary insulation modules are arranged in an alternating manner, so that the first gap and the second gap are also arranged in an alternating manner, which reduces the overall heat leakage at the gaps; at the same time, it greatly reduces the use of glue, shortens the construction cycle, and reduces the construction environment (humidity and temperature) and process requirements. Attached Figure Description

[0030] Figure 1 This is a cross-sectional schematic diagram of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention;

[0031] Figure 2 This is a three-dimensional exploded view of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0032] Figure 3 This is a three-dimensional exploded view of the main insulation module of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0033] Figure 4 This is a three-dimensional exploded view of the secondary insulation module of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the secondary insulation module of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention;

[0035] Figure 6 This is a three-dimensional exploded view of the linear fastening plate of the membrane-type enclosure system in the installation method of the membrane-type enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0036] Figure 7 This is a three-dimensional exploded view of the cross-shaped fastening plate of the membrane enclosure system in the installation method of the membrane enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0037] Figure 8 This is a three-dimensional exploded view of the through-fasteners of the membrane-type enclosure system in the installation method of the membrane-type enclosure system for carrying cryogenic liquid cargo provided in an embodiment of the present invention.

[0038] Figure Labels

[0039] 1 - Through-fastener, 2 - Secondary insulation layer, 3 - Secondary film layer, 4 - Primary insulation layer, 5 - Primary film layer, 6 - Fastening plate, 7 - Resin strip, 8 - Spacer plate, 9 - Second gap, 10 - First gap, 11 - Primary film layer, 12 - Cross-shaped fastening plate, 13 - Straight-line fastening plate, 14 - Primary insulation module, 15 - Secondary film layer, 16 - Secondary insulation module, 17 - First top plate, 18 - Through-type stress relief joint, 19 - Upper insulation block, 20 - Non-through-type stress relief joint, 21 - Through-fastener installation notch, 22 - Middle plate, 23 - Fixing pad, 24 - Lower insulation block, 25 - Second top plate, 26 - Insulation block, 27 - Cross-shaped reinforcing structure, 28 - Bottom plate, 29 - Mounting and fixing holes, 30 - Spacing bolt holes, 31 - Strip-shaped clamping 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 - Beveled 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-ended screw, 52 - Metal sealing cap. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0042] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0043] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application, which have the features of the claims and are therefore all within the scope of protection defined herein.

[0044] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0045] Specific embodiments of this application are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to ascertain the true intent based on the user's historical operations, and to avoid unnecessary or redundant details that would obscure this application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in various ways with substantially any suitable detailed structure.

[0046] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0047] This invention provides an installation method for a membrane-type enclosure system for carrying cryogenic liquid cargo, such as... Figures 1 to 8 As shown, the membrane-type containment system is used to contain cryogenic media. It includes a main membrane layer 5, a fastening plate 6, a main 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 through fasteners 1. The main membrane layer 5, main insulating layer 4, secondary membrane layer 3, and secondary insulating layer 2 together form a cryogenic liquid cargo containment system to contain cryogenic media. Simultaneously, the space between the main membrane layer 5 and the secondary membrane layer 3 forms a primary shielding space, and the space between the secondary membrane layer 3 and the hull structure (bulls) forms a secondary shielding space. The installation method in the planar area of ​​the membrane-type containment system includes the following steps:

[0048] Before installing the secondary insulation module, lines need to be marked on the bulkhead of the hull structure. Based on the markings, studs perpendicular to the bulkhead are welded to the positions on the bulkhead where the spacer plate 8 is placed, and the spacer plate 8 is installed on the studs. The spacer plate 8 has four through holes symmetrically arranged at its four corners about the center line of the spacer plate 8, and a stud is inserted in each through hole.

[0049] 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-ended 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 washers 50. The lower section includes a welding base 36 and a nut 37 contained within 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. The clamping structure is located on the upper part of the main insulation module 14. In the installation notch 19 on the insulation block, the lower part of the clamping structure fits into the fixing pad 23. The cap rod structure 41 passes through the connecting metal plate 40 and is connected and fixed to the beveled thread 39 of the metal connecting rod 38, and fixes the connecting metal plate 40 to the secondary film 15 at the corresponding position. The cap rod structure 41 is locked to 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. 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. The metal connecting rod 38 passes through the installation fixing hole 29 provided on the cross reinforcing structure 27 of the secondary insulation module 16.

[0050] Each stud on the spacer plate 8 corresponds to one corner of four different and adjacent secondary insulation modules 16. Each secondary insulation module 16 in the planar area has spacer bolt holes 30 at its four corners. These holes accommodate studs inserted into the spacer plate 8 and fastening nuts threaded onto the studs. Each secondary insulation module 16 includes a second top plate 25, a cross-shaped reinforcing structure 27, and a bottom plate 28, which are sequentially fixed from top to bottom. The second top plate 25, located at the very top of all components in the secondary insulation module 16, is a rectangular plate. Each secondary insulation module 16 also includes four insulation blocks 26. The top plate 25 is bonded and fixed to the second film 15 in the second film layer 3. The cross-shaped reinforcing structure 27 is located below the second top plate 25, and its outer periphery overlaps with the second top plate 25. The cross-shaped reinforcing structure 27 and the second top plate 25 can be connected by glue or rivets. The bottom plate 28 is located below the cross-shaped reinforcing structure 27. The bottom plate 28 has the same size and shape as the second top plate 25, and its outer periphery overlaps with the cross-shaped reinforcing structure 27 and the second top plate 25. The bottom plate 28 and the cross-shaped reinforcing structure 27 are connected by glue or rivets. An insulation block 26 is provided between the second top plate 25 and the bottom plate 28. The insulation block 26 is fixed within the space formed by the second top plate 25, the bottom plate 28, and the cross-shaped reinforcing structure 27. The size and shape of the insulation block 26 are identical to those of the space; that is, the size and shape of the insulation block 26 can be determined based on the size and shape of the space formed by the outer periphery of the second top plate 25, the bottom plate 28, and the cross-shaped reinforcing structure 27. Simultaneously, the insulation block 26 should fill the entire space and overlap with the outer periphery of the second top plate 25, the bottom plate 28, and the cross-shaped reinforcing structure 27. The contact points between the insulation block 26 and the second top plate 25, the bottom plate 28, and the cross-shaped reinforcing structure 27 are all connected and fixed with adhesive. The center of the cross-shaped reinforcing structure 27 is set... The second top plate 25 and the bottom plate 28 are provided with mounting holes 29 corresponding to the mounting holes 29 on the cross-shaped reinforcing structure 27. That is, the cuboid secondary insulation module 16 forms mounting holes 29 along the thickness direction at the center of the cuboid for installing and fixing the through fastener 1. At the same time, the bottom plate 28 is also provided with an opening concentric with the spacer bolt hole 30, and the top plate 25 and the insulation block 26 are provided with spacer bolt holes 30 concentric with the through hole and with a diameter 2-4 times that of the through hole, so as to facilitate the locking of the spacer plate by the gasket, the fastening nut and the tooling.Furthermore, after the studs on the four secondary insulation modules around each spacer plate 8 are tightened by nuts, the spacer bolt holes 30 on each secondary insulation module 16 are filled with plungers of the same material as the insulation block, so that each secondary insulation module 16 can be interconnected and play an auxiliary anchoring role for each secondary insulation module 16.

[0051] In this embodiment, the spacer 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 1mm, 2mm, 5mm or 10mm. The spacer plate is used for leveling. By using spacer plates of different thicknesses to stack and combine, the distance between the bottom plate 28 of the secondary insulation module 16 and the bulkhead is 10mm. The diameter of the through hole on the spacer plate 8 is 0.5-2mm larger than the outer diameter of the thread on the stud.

[0052] After the secondary insulation module 16 is installed onto the spacer plate 8, the through fastener 1 is installed. The metal connecting rod 38 of the through fastener 1 is inserted into the mounting 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 set on 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 planar area. At the same time, the use of the spacer 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.

[0053] 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 spacer plate 8 are installed, the lifting equipment is required for temporary stabilization. After the cap rod structure 41 of the upper part of the through fastener 1 is tightened and fixed to the metal connecting rod 38, the lifting equipment is removed.

[0054] Furthermore, in this embodiment, the bottom plate 28 of the secondary insulation module 16 has openings at all four corners for mounting studs, the diameter of which is 0.5-2mm larger than the outer diameter of the thread on the stud.

[0055] After the secondary insulation layer 2 is installed, the secondary film layer 3 is installed. Multiple secondary films 15 with a second preset size, which are connected by splicing, are respectively bonded and fixed to the second top plate 25 of the secondary insulation module 16.

[0056] The secondary insulation layer 2 includes multiple secondary insulation modules 16 spaced apart and arranged in a matrix, and the second gap 9 between two adjacent secondary insulation modules 16 is filled with material.

[0057] The secondary membrane layer 3 can absorb the cryogenic medium when the main membrane layer 5 leaks, thus avoiding the safety risks caused by the contact between the hull structure and the cryogenic medium. The secondary membrane layer 15 is made of a flexible sealing material that meets the requirements of low temperature resistance.

[0058] After the installation of the secondary thin film layer 3 is completed, the main insulation module 14 is installed. The main insulation layer 4 includes multiple main insulation modules 14 arranged in a matrix at intervals. The first gap 10 between two adjacent main insulation modules 14 is filled with flexible thermal insulation material. The main insulation module 14 in the planar area has a cuboid structure. The main insulation layer 4 is used to support and insulate the main thin film layer 5. Among them, the main insulation module 14 in the planar layer has a cuboid structure. Each main insulation module includes a first top plate 17, an upper thermal insulation block 19, a middle plate 22, and a lower thermal insulation block 24, which are fixedly connected from top to bottom. The plate 17, located at the top of all components in the main insulation module 14, is a rectangular plate with a through-type stress relief seam 18 designed according to the structure of the main layer film 11 covering it. The upper insulation block 19, also a rectangular plate, is located below the first top plate 17 and is fixedly connected to the first top plate 17 with adhesive. The upper insulation block 19 has a non-through-type stress relief seam 20 aligned with the through-type stress relief seam 18 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, and the first top plate 17 is located in the middle of the rectangle of the upper insulation block 19. Specifically... Located at the center of the rectangular upper insulation block 19, the middle plate 22 and lower insulation block 24, which are the same size as the upper insulation block 19, are sequentially arranged below the upper insulation block 19. The middle plate 22 is fixedly connected to the upper insulation block 19 with glue and completely overlaps with it. The lower insulation block 24 is fixedly connected to the middle plate 22 with glue and completely overlaps with it. The upper insulation block 19 and lower insulation block 24, which are arranged in a cuboid structure, have through fastener installation notches 21 at the four vertices and the midpoint of the long side for installing through fasteners. The mounting notches are identical in shape and size. The middle plate 22 has fixing blocks 23 at the four vertices and the midpoint of the long side of the rectangle. The part of the fixing block 23 in the lower insulation block 24 is adapted to the shape of the through fastener mounting notch 21 on the lower insulation block 24. That is, the shape and size of the fixing block 23 are the same as the shape and size of the through fastener mounting notch 21 on the lower insulation block 24, and can fill the mounting notch formed on the lower insulation block 24. The part of the fixing block 23 in contact with the lower insulation block 24 is fixed by adhesive. Finally, the main insulation module 14 is constructed by using two layers of non-metallic plates and two layers of thermal insulation material.

[0059] Furthermore, based on the structure of the main insulation module 14 described above, in the planar area, each main insulation module 14 is pressed and connected to the upper part of six through fasteners 1. The six through fasteners 1 are respectively located at the four corners and the midpoints of the two long sides of the main insulation module 14, which is arranged in a cuboid structure. After the four main insulation modules 14 corresponding to the same corner are placed, the corresponding pressing structure of the through fastener 1 is installed at the corner. The bottom metal plate 42 of the pressing block of the pressing structure presses on the middle plate 22 of the four adjacent main insulation modules 14. At the same time, the bottom metal plate 42 of the pressing structure of the through fastener 1 located at the midpoint of the long side of the two adjacent main insulation modules 14 presses on the middle plate 22 of the adjacent main insulation modules 14. The pressing structures are all fixedly connected and locked to the upper end of the metal connecting rod.

[0060] The fastening plate 6 is installed on the upper part of the gap formed by two adjacent main insulation modules 14. The fastening plate 6 has a cross-shaped structure or a straight structure, that is, the fastening plate 6 includes a cross-shaped fastening plate 12 and a straight fastening plate 13, and is made of non-metallic sheet material that is easy to process and has low temperature resistance. The upper surface of the fastening plate 6 is in contact with the main layer film layer 5, and is provided with a fixing welding plate mounting groove 34 for welding to the main layer film 11 and for mounting a fixing welding plate 35. Specifically, the sealing metal plate 32 has a sealing metal plate mounting groove 33. On the four long strips of the cross-shaped fastening plate 12 and the two long strips (strip plates 31) of the straight-line fastening plate 13, a fixing welding plate 35 is fixed for welding and fixing to the main layer film 11. Simultaneously, the center of the cross of the cross-shaped fastening plate 12 and the center of the straight-line fastening plate 13 are each provided with a mounting hole 29 for mounting a through fastener 1, thereby facilitating the installation and fixing of the through fastener 1. As an example, the fastening plate 6 is made of glued laminated timber or a substitute material that meets rigidity requirements, with a plate thickness ranging from 6mm to 15mm. The upper end of the mounting hole 29 on the fastening plate 6 forms a circular sealing metal plate mounting groove 33 with a diameter of 60-120mm and a depth of 1.5-3mm. A sealing metal plate 32 with a central hole matching the groove size is embedded within the groove.

[0061] After the fastening plate 6 is installed, the main layer film layer 5 is installed. The boundary of each main layer film 11 is welded and fixed to the fixed welding plate 35 or sealing metal sheet 32 ​​on the fastening plate 6 on the main insulation module 14. Specifically, the first main layer film 11 installed on the welding plate is fixed to the fixed welding plate 35 or sealing metal sheet 32 ​​by intermittent spot welding. The main layer film 11 adjacent to the first main layer film 11 overlaps the first main layer film 11. The overlap part is sealed and welded along the entire edge. The boundary of the main layer film 11 overlapping the sealing metal sheet 32 ​​in the through hole in the middle of the fastening plate 6 is welded to the sealing metal sheet 32. The upper end metal sealing cap 52 of the upper part of the through fastener 1 is welded to the sealing metal sheet 32 ​​to achieve the sealing of the entire main layer film layer 5.

[0062] In this embodiment, the main layer film 11 of the main layer film layer 5 is made of Invar steel or 304L stainless steel prefabricated with a set corrugated shape.

[0063] In this embodiment, the boundary of each main layer film 11 is welded and fixed to the fixed welding plate 35 or sealing metal sheet 32 ​​on the fastening plate 6 on the main insulation module 14. Specifically, the first main layer film 11 mounted on the welding plate is fixed to the fixed welding plate 35 or sealing metal sheet 32 ​​by intermittent spot welding. The main layer film 11 adjacent to the first main layer film 11 overlaps the first main layer film 11. The overlap part is sealed and welded along the entire edge. The boundary of the main layer film 11 overlapping the sealing metal sheet 32 ​​in the through hole in the middle of the fastening plate 6 is welded to the sealing metal sheet 32. The upper end metal sealing cap 52 of the upper part of the through fastener 1 is welded to the sealing metal sheet 32 ​​to achieve the sealing of the entire main layer film layer 5.

[0064] In the above embodiment, the space between the main thin film layer 5 and the secondary thin film layer 3 forms the main shielding space, and the space between the secondary insulating layer 2 and the hull structure forms the 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 installed in the main shielding space and the secondary shielding space respectively to detect whether there is a leak of cryogenic medium.

[0065] In the above embodiments, the first top plate 17, the middle plate 22, the second top plate 25, the cross-shaped reinforcing structure 27, and the bottom plate 28 are all made of low-temperature resistant non-metallic materials with a set strength. The low-temperature resistant non-metallic materials are able to withstand temperatures of at least -196 degrees Celsius and have a strength greater than or equal to 4.0 MPa.

[0066] Meanwhile, the upper insulation block, the lower insulation block, and the insulation block position are all made of materials that meet the set thermal conductivity requirements, wherein the set thermal conductivity requirement is no greater than 0.1W / (m·K).

[0067] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A method of installing a membrane type containment system for carrying a cryogenic liquid cargo, characterized by, The thin film type containment system is used to contain ultra-low temperature medium, and includes a main layer thin film layer, a fastening plate, a main layer insulation layer, a secondary layer thin film layer and a secondary layer insulation layer which are sequentially connected and fixed to the hull structure by penetrating fasteners, and enclose a low temperature liquid cargo tank for containing ultra-low temperature medium. In a planar area of the thin film type containment system, the installation method comprises: installing distance plates on the bulkhead of the hull structure according to the set lines, and installing secondary insulation modules on the distance plates, wherein the secondary insulation modules in the planar area are all arranged in a rectangular shape; after the secondary insulation modules are installed on the distance plates, the installation and fixation are performed by penetrating fasteners, wherein a welding base for fixing the penetrating fasteners is welded at the corresponding position of the hull structure where the penetrating fasteners are arranged; after the secondary layer insulation layer is installed, the secondary layer thin film layer is installed, the secondary layer thin film in the secondary layer thin film layer is made of flexible sealing material which meets the low temperature resistance condition, and in the planar area, the secondary layer thin film layer includes a plurality of secondary layer thin films with a preset size which are connected in a splicing manner, and each secondary layer thin film is fixedly connected with the top plate of the secondary insulation module by adhesion; after the installation of the secondary layer thin film layer is completed, the installation of the main insulation module is performed, and in the planar area, each main insulation module is press-connected with the upper segment of six penetrating fasteners, and the six penetrating fasteners are respectively arranged at the four corner positions and the midpoint positions of the two long sides of the main insulation module which is arranged in a cuboid structure; after the four main insulation modules corresponding to the same corner position are arranged, the press structure of the penetrating fastener at the corner position is installed; the fastening plate arranged at the upper part of the gap between the two adjacent main insulation modules is installed, and the fastening plate is arranged in a cross-shaped structure or a linear structure; after the fastening plate is installed, the main layer thin film layer is installed, and the main layer thin film layer includes a plurality of main layer thin films with a preset size which are connected in a splicing manner, and the boundary of each main layer thin film is fixedly connected with the fixed welding plate or the sealing metal sheet on the fastening plate of the main insulation module by welding.

2. A method of installing a membrane type containment system carrying cryogenic liquid cargo according to claim 1, characterized in that, The installation of the distance plates on the bulkhead of the hull structure according to the set lines comprises: the lines are drawn on the bulkhead of the hull structure, the studs which are arranged vertically to the bulkhead are welded at the positions of the bulkhead where the distance plates are arranged, and the distance plates are installed on the studs, wherein the four corners of the distance plate are symmetrically arranged about the center line of the distance plate, and four through holes are arranged at the four corners, and a stud is arranged in each through hole; each stud on the distance plate corresponds to one corner of four different and adjacent secondary insulation modules, wherein the distance bolt holes are arranged at the four corner positions of the secondary insulation modules in the planar area, and the distance bolt holes are used to accommodate the studs arranged on the distance plates and the fastening nuts which are threadedly connected with the studs.

3. The installation method of the thin film type containment system for carrying low temperature liquid cargo according to claim 2, wherein The welding base contains a nut, the metal connecting rod of the through fastener is arranged in the installation fixing hole in the middle of the secondary insulation module, and the cap rod structure of the upper segment of the through fastener is screwed and fixed with the metal connecting rod, and the lower segment of the through fastener is used to anchor the secondary insulation module in the plane area.

4. The method of claim 3, wherein the method further comprises: The bottom metal plate of the pressing block of the pressing structure of the through fastener is pressed on the middle plate of the four adjacent main insulation modules in the same corner area, and the bottom metal plate of the pressing block of the pressing structure of the through fastener arranged at the midpoint of the long side of the adjacent two main insulation modules is pressed on the middle plate of the adjacent main insulation module, and the pressing structure is respectively fixedly connected with the upper end of the metal connecting rod and locked.

5. The method of claim 4, wherein the method further comprises: The cross center of the cross-shaped fastening plate and the linear center of the linear fastening plate are provided with sealing metal sheets and installation fixing holes for the through fastener, and the four long edges of the cross-shaped fastening plate and the two long edges of the linear fastening plate are fixedly provided with fixed welding plates for welding with the main layer film layer.

6. A method of installing a membrane type enclosure system carrying cryogenic liquid cargo according to claim 5, wherein The boundary of each main layer film is welded and fixed with the fixed welding plate or the sealing metal sheet on the fastening plate arranged on the main insulation module, and specifically comprises: The first main layer film arranged 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, the overlapped part is sealing welded along the whole edge line, the main layer film boundary on the sealing metal sheet in the through hole at the middle position of the fastening plate is welded on the sealing metal sheet, and the upper end metal sealing cap of the upper segment of the through fastener is welded on the sealing metal sheet, so as to realize the sealing of the whole main layer film layer.

7. The method of claim 6, wherein the distance plate is made of plywood or plastic alternative materials meeting the rigidity requirements, and the thickness is at least one of 1 mm, 2 mm, 5 mm or 10 mm, and the distance plate is used for leveling, and by using distance plates with different thicknesses, the distance between the bottom plate of the secondary insulation module and the bulkhead is 10 mm; the hole diameter of the through hole on the distance plate is greater than the outer diameter of the thread on the stud by 0.5-2 mm.

8. The method of claim 7, wherein the bottom plate arranged on the bottom surface of the secondary insulation module close to the distance plate is rectangular, and the opening hole for installing the stud is arranged at the four corners, and the hole diameter of the opening hole on the bottom plate is greater than the outer diameter of the thread on the stud by 0.5-2 mm.

9. The method of claim 8, wherein the method further comprises: ​ ​ During the installation of the secondary insulation module on the upper and top of the bulkhead, the device needs to be lifted for temporary stabilization after the secondary insulation module and the spacer plate are installed, and the cap rod structure of the upper part of the through fastener is screwed and fixed with the metal connecting rod, and then the lifting device is removed.

10. The method of claim 9, wherein the fastening plate is made of plywood or alternative materials that meet the rigidity requirements, and the thickness of the fastening plate is in the range of 6mm-15mm; a circular sealing metal sheet installation groove with a diameter of 60-120mm and a depth of 1.5-3mm is formed at the upper end of the installation and fixing hole of the fastening plate, and a sealing metal sheet with a center hole matching the size of the installation groove is embedded in the installation groove.

11. The method of claim 10, wherein the primary insulation layer comprises a plurality of primary insulation modules arranged in a matrix, and the first gap between adjacent primary insulation modules is filled with flexible insulation material; wherein the primary insulation module in the plane area is in a cuboid structure, and each primary insulation module comprises a first top plate, an upper insulation block, a middle plate and a lower insulation block fixed and connected in sequence from top to bottom, the first top plate is provided with a through stress release slot according to the structure of the primary film layer covered thereon, and the upper insulation block is provided with a non-through stress release slot aligned with the stress release slot provided on the first top plate.

12. The method of claim 11, wherein the secondary insulation layer comprises a plurality of secondary insulation modules arranged in a matrix, and the second gap between adjacent secondary insulation modules is filled with flexible insulation material.

13. The method of claim 12, wherein the secondary insulation module in the plane layer is in a cuboid structure, and each secondary insulation module comprises a second top plate, a cross-shaped reinforcing structure and a bottom plate fixed and connected in sequence from top to bottom, an insulation block is arranged 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-shaped reinforcing structure, and the size and shape of the insulation block are the same as those of the space, the cross-shaped reinforcing structure is provided with an installation and fixing hole at the center of the cross for installing a through fastener, and the second top plate and the bottom plate are both provided with installation and fixing holes corresponding to the installation and fixing hole of the cross-shaped reinforcing structure, and the second top plate is adhesively fixed with the secondary film in the secondary film layer.

14. The method of claim 13, wherein ​ ​ ​ ​ The space between the primary layer thin film layer and the secondary layer thin film layer forms a primary layer shielding space, the space between the secondary layer thin film layer and the ship body structure forms a secondary layer shielding space, and the primary layer shielding space and the secondary layer shielding space are both filled with inert protective gas.

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