Method for installing a membrane-type enclosure system for carrying low-temperature liquefied gas

Abstract

The embodiment of the present application provides a kind of installation method of thin film type enclosure system carrying low temperature liquefied gas, thin film type enclosure 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 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 basis of setting line on the ship body bulkhead, installing secondary insulation module on fixed distance plate, and is fixed by through fastener, after installing secondary layer insulation layer, 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] The present application relates to the technical field of equipment design for transporting and storing cryogenic liquid, in particular to a method for installing a membrane type containment system for carrying cryogenic liquefied gas. BACKGROUND

[0002] When transporting gases such as natural gas and ethane gas, in order to transport over a long distance more economically, the gas is usually cooled to a low temperature and the liquefied gas is transported. After liquefaction, the volume of the gas is greatly reduced, and the transportation cost is reduced. The low-temperature liquid after liquefaction is stored and transported by using a special low-temperature liquid cargo tank.

[0003] In the current shipbuilding industry, the low-temperature liquid cargo containment system is mainly related to the manufacture of LNG ships. For LNG ships, the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) defines four types of containment systems, namely type A, type B, type C and membrane type containment systems. Among them, the membrane type containment system is widely used due to its high utilization rate of tank capacity, good thermal insulation performance, small wind resistance area and other advantages.

[0004] The existing membrane type containment system technology mainly includes Mark III type and NO 96 type, both of which come from GTT company in France. However, both of these containment systems have their own shortcomings. For the NO 96 type, because the primary and secondary insulation modules are arranged in an upper and lower overlapping manner, the gaps between the primary insulation modules and the gaps between the secondary insulation modules are directly connected to the ship structure. Although there are glass wool and other thermal insulation materials uniformly distributed at the gaps, there is still a large heat leakage at the gaps. For the Mark III type, because the primary insulation module, the secondary insulation module and the secondary membrane are fixed and bonded together by glue, and are fixed on the ship structure by epoxy resin, the relative movement between the primary and secondary insulation modules is limited, and the overall resistance to ship movement and liquid cargo sloshing is poor. In addition, because a large amount of glue is used, the construction period is long, and because the requirements for the construction environment (humidity and temperature) and the process are relatively strict, the delivery time of the whole ship is delayed. SUMMARY

[0005] In view of the above problems existing in the prior art, the embodiment of the present application provides a kind of membrane type containment system installation method for carrying low temperature liquefied gas, the membrane type containment system is used to accommodate ultra-low temperature medium, including main layer film layer, fastening card plate, main layer insulation layer, secondary layer film layer and secondary layer insulation layer are sequentially connected and fixed to ship structure (hull steel plate) by through fastener, main layer shielding space is formed using the gap between the internal gap of main layer insulation layer and main layer insulation layer and main layer film layer, and secondary shielding space is formed using the gap between the internal gap of secondary layer insulation layer and secondary layer insulation layer and secondary layer film layer, the membrane type containment system installed using the above installation method effectively builds double-layer sealed ultra-low temperature medium storage carrier, and solves the storage and leakage prevention problem of ultra-low temperature medium.

[0006] The embodiment of the present application provides a kind of membrane type containment system installation method for carrying low temperature liquefied gas, the membrane type containment system is used to accommodate ultra-low temperature medium, including main layer film layer, fastening card plate, main layer insulation layer, secondary layer film layer and secondary layer insulation layer are sequentially connected and fixed to ship structure, the main layer film layer, the main layer insulation layer, the secondary layer film layer and the secondary layer insulation layer are enclosed to form a low temperature liquid cargo storage tank for accommodating ultra-low temperature medium, in the plane area in the membrane type containment system, the installation method includes:

[0007] Distance plate is installed on the bulkhead of ship structure according to the set line, and the secondary insulation module is installed on the distance plate, wherein the secondary insulation module in the plane area is arranged in a rectangular shape;

[0008] After the secondary insulation module is installed on the distance plate, it is installed and fixed by through fastener, wherein a welding base for fixing the through fastener is welded at the corresponding position of the ship structure provided with the through fastener;

[0009] After the secondary layer insulation layer is installed, the secondary layer film layer is installed, the boundary of each secondary layer film is welded and fixed with the top welding plate or top welding gasket provided on the second top plate of the secondary insulation module, and after a single secondary layer film is placed at the corresponding position, a heat protection layer is laid at the position where the secondary layer film boundary does not contact the top welding plate and the top welding gasket;

[0010] After the installation of the secondary layer film layer is completed, the installation of the main insulation module is carried out, each main insulation module in the plane area is connected by pressing with the upper segment part of six through fasteners, and the six through fasteners are respectively arranged at four corner positions and midpoint positions of two long sides of the main insulation module arranged in a cuboid structure; after the four main insulation modules corresponding to the same corner are arranged, the pressing structure of the corresponding through fastener is installed at the corner where the four main insulation modules are arranged;

[0011] The fastening plate is installed on the upper part of the first gap formed by the two adjacent main insulation modules, and the fastening plate is in a cross-shaped structure or a linear structure.

[0012] The fastening plate is arranged between the main layer film layer and the main layer insulation layer, and the fastening plate comprises at least one strip-shaped plate arranged on the upper part of the first gap and arranged on the main insulation modules on both sides of the first gap

[0013] After the fastening plate is installed, the main layer film layer is installed, and the edges of each main layer film are welded and fixed with the fixed welding plate and the sealing metal sheet on the fastening plate arranged on the main insulation module.

[0014] In some embodiments of the present application, the distance plate is installed on the bulkhead of the ship body structure according to the set line, comprising:

[0015] The bulkhead of the ship body structure is marked, and the studs arranged vertically on the bulkhead are welded at the positions of the bulkhead where the distance plate is placed according to the marking, and the distance plate is installed on the studs, wherein the distance plate is symmetrically arranged about the center line of the distance plate, and four through holes are arranged in the four corners of the distance plate, and a stud is arranged in each through hole.

[0016] 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 planar area are provided with distance bolt holes at the four corners, and the distance bolt holes are used to accommodate the studs arranged on the distance plate and the fastening nuts threadedly connected with the studs.

[0017] In some embodiments of the present application, the welding base contains a nut, and the metal connecting rod of the through fastener is arranged in the installation fixing hole in the middle of the secondary insulation module, the cap rod structure of the upper segment of the through fastener is threadedly fixed with the metal connecting rod, and the lower segment of the through fastener is used to anchor the secondary insulation module in the planar area.

[0018] In some embodiments of the present application, when the secondary layer film layer is installed, the installation method further comprises:

[0019] The contact position of the secondary layer film with the top welding plate or the contact position of the secondary layer film with the top welding gasket is intermittently spot welded, after a whole piece of secondary layer film is welded, the adjacent secondary layer film is overlapped on the last secondary layer film, and the continuous welding is performed on the overlapping edge line; the cycle construction is repeated until the secondary layer films in the planar area are welded and sealed with each other.

[0020] In some embodiments of the present application, the pressing block bottom metal plate of the through fastener pressing structure is pressed on the middle plate of the four adjacent main insulation modules in the same corner area, and the lower pressing block top metal plate of the through fastener pressing structure arranged at the midpoint of the long side of the adjacent two main insulation modules is on the middle plate of the adjacent main insulation module, and the through fastener pressing structure is respectively fixedly connected with the upper end of the metal connecting rod and locked.

[0021] In some embodiments of the present application, the fastening card board includes a cross-shaped fastening card board and a one-character-shaped fastening card board, which are made of non-metallic plates with low-temperature resistance, the upper surface of the fastening card board is in contact with the main layer film layer, and a fixed welding plate and a sealing metal sheet are arranged for welding with the main layer film, and the four long edges of the cross-shaped fastening card board and the two long edges of the one-character-shaped fastening card board are fixedly provided with fixed welding plates for welding with the main layer film.

[0022] The cross center of the cross-shaped fastening card board and the one-character center of the one-character-shaped fastening card board are provided with mounting fixing holes for the through fastener.

[0023] In some embodiments of the present application, the boundary of each main layer film is welded and fixed with the fixed welding plate or the sealing metal sheet on the fastening card board arranged on the main insulation module, specifically including:

[0024] The first main layer film mounted on the welding plate is fixed to the fixed welding plate and 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 overlapping part is sealed and welded by a whole edge line, the boundary of the main layer film on the sealing metal sheet in the through hole at the middle position of the fastening card board is welded on the sealing metal sheet, and the upper end metal sealing cap of the upper section of the through fastener is welded on the sealing metal sheet, so as to realize the sealing of the whole main layer film layer.

[0025] In some embodiments of the present application, the boundary of each secondary layer film is welded and fixed with the top welding plate or the top welding gasket arranged on the secondary insulation module, specifically including:

[0026] The boundary of each secondary layer film is welded and fixed with the top welding plate or the top welding gasket arranged on the second top plate of the secondary insulation module, a heat protection layer is laid at the position where the boundary of the secondary layer film does not contact the top welding plate and the top welding gasket after a single secondary layer film is placed in the corresponding position; the position where the secondary layer film contacts the top welding plate or the position where the secondary layer film contacts the top welding gasket is intermittently spot welded, and after a whole secondary layer film is welded, the adjacent secondary layer film is overlapped on the previous secondary layer film, and the edge line of the overlapping part is continuously welded; the construction is cycled until the secondary layer films in the planar area are welded and sealed with each other.

[0027] In some embodiments of the present application, the spacer plate is made of plywood or a plastic alternative material that meets the rigidity requirements, and the thickness is at least one of 1mm, 2mm, 5mm or 10mm, and the spacer plate is used for leveling, and the distance between the bottom plate of the secondary insulation module and the bulkhead is 10mm by using spacer plates of different thicknesses stacked together; the hole diameter of the through hole on the spacer plate is greater than the outer diameter of the thread on the stud by 0.5-2mm.

[0028] In some embodiments of the present application, the bottom plate arranged at the bottom surface of the secondary insulation module close to the side of the spacer plate is rectangular, and the opening hole for mounting the stud is arranged at each of the four corners, and the opening hole diameter on the bottom plate is greater than the outer diameter of the thread on the stud by 0.5-2mm.

[0029] In some embodiments of the present application, during the installation of the secondary insulation module on the upper and top part of the bulkhead, the lifting equipment is used to temporarily stabilize after the secondary insulation module and the spacer plate are installed, and the cap rod structure of the through fastener upper section is screwed and fixed with the metal connecting rod, at the same time, the connecting metal sheet of the through fastener is fixed to the surface of the secondary layer film layer through the cap rod structure, and after the connecting metal sheet, the secondary layer film and the cap rod structure are sealed and fixed by welding, the lifting equipment is removed.

[0030] In some embodiments of the present application, the top plate of the secondary insulation module is provided with a top welding plate arranged in a cross shape and a top welding plate arranged in a straight line arranged in the same direction and staggered in sequence, and the top welding plate arranged in a cross shape and the top welding plate arranged in a straight line are riveted or glued to the top plate of the secondary insulation module, and the upper surface of the top welding plate and the upper surface of the top welding pad are flush with the upper surface of the second top plate.

[0031] In some embodiments of the present application, the top plate of the primary insulation module is provided with a fixed welding plate arranged in a cross shape and a fixed welding plate arranged in a straight line arranged in the same direction and staggered in sequence, and the fixed welding plate arranged in a cross shape and the fixed welding plate arranged in a straight line are fixedly connected with the fastening plate and arranged flush on the upper surface.

[0032] The fastening plate is made of plywood or a substitute material that meets the rigidity requirements, and the thickness of the plate is in the range of 6mm-15mm.

[0033] A circular groove with a diameter of 60-120mm and a depth of 1.5-3mm is formed at the upper end of the through hole on the fastening plate, and a sealing metal sheet with a center hole matching the size of the groove is embedded in the circular groove.

[0034] In some embodiments of the present application, the main layer insulation layer comprises a plurality of main insulation modules arranged in a matrix, and a flexible thermal insulation material is filled in the first gap between two adjacent main insulation modules; wherein the main insulation modules in the planar area are in a cuboid structure, each main insulation module comprises a first top plate, an upper thermal insulation block, a middle plate and a lower thermal insulation block fixedly 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 main layer film layer arranged thereon, the upper thermal insulation block is provided with a non-through stress release slot aligned with the stress release slot arranged on the first top plate, and the lower thermal insulation block is provided with a secondary film adapting groove for accommodating the protruding structure on the secondary film layer according to the shape and arrangement of the secondary film layer in contact therewith.

[0035] In some embodiments of the present application, the secondary layer film in the secondary layer film layer is made of invar steel or 304L stainless steel with a preset corrugated shape;

[0036] The secondary layer insulation layer comprises a plurality of secondary insulation modules arranged in a matrix, and a flexible thermal insulation material is filled in the second gap between two adjacent secondary insulation modules;

[0037] The space between the layer film layer and the secondary layer film layer forms a main layer shielding space, and the space between the secondary layer insulation layer and the ship structure forms a secondary layer shielding space, and the main layer shielding space and the secondary layer shielding space are both filled with inert protective gas.

[0038] Compared with the prior art, the film type enclosure system provided by the embodiments of the present application has the beneficial effects that the main insulation module and the secondary insulation module are arranged in a staggered manner, so that the first gap and the second gap are also arranged in a staggered manner, the overall heat leakage at the gap is reduced, the use of glue is cancelled, the construction period is shortened, and the construction environment (humidity and temperature) and process requirements are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The film type enclosure system cross-sectional view in the film type enclosure system installation method for carrying low-temperature liquefied gas provided by the embodiments of the present application;

[0040] Figure 2 The film type enclosure system three-dimensional exploded view in the film type enclosure system installation method for carrying low-temperature liquefied gas provided by the embodiments of the present application;

[0041] Figure 3 The main insulation module three-dimensional exploded view of the film type enclosure system in the film type enclosure system installation method for carrying low-temperature liquefied gas provided by the embodiments of the present application;

[0042] Figure 4A three-dimensional exploded view of a secondary insulation module of a thin film type envelope system for carrying low-temperature liquefied gas in the installation method of the thin film type envelope system for carrying low-temperature liquefied gas provided by the embodiment of the present application;

[0043] Figure 5 A schematic view of a thin film type envelope system secondary insulation module in the installation method of the thin film type envelope system for carrying low-temperature liquefied gas provided by the embodiment of the present application;

[0044] Figure 6 A three-dimensional exploded view of a one-character type fastening clamping plate of a thin film type envelope system for carrying low-temperature liquefied gas in the installation method of the thin film type envelope system for carrying low-temperature liquefied gas provided by the embodiment of the present application;

[0045] Figure 7 A three-dimensional exploded view of a cross type fastening clamping plate of a thin film type envelope system for carrying low-temperature liquefied gas in the installation method of the thin film type envelope system for carrying low-temperature liquefied gas provided by the embodiment of the present application;

[0046] Figure 8 A three-dimensional exploded view of a through fastener of a thin film type envelope system for carrying low-temperature liquefied gas in the installation method of the thin film type envelope system for carrying low-temperature liquefied gas provided by the embodiment of the present application.

[0047] Reference signs

[0048] 1 - through fastener, 2 - secondary layer insulation layer, 3 - secondary layer thin film layer, 4 - primary layer insulation layer, 5 - primary layer thin film layer, 6 - fastening clamping plate, 7 - resin strip, 8 - distance plate, 9 - second gap, 10 - first gap, 11 - primary layer thin film, 12 - cross type fastening clamping plate, 13 - one-character type fastening clamping plate, 14 - primary insulation module, 15 - secondary layer thin film, 16 - secondary insulation module, 17 - first top plate, 18 - through type stress release joint, 19 - upper heat preservation block, 20 - non-through type stress release joint, 21 - through fastener installation gap, 22 - middle plate, 23 - fixed pad, 24 - lower heat preservation block, 25 - secondary layer thin film fitting groove, 26 - top welding plate, 27 - top welding gasket, 28 - second top plate, 29 - welding plate installation groove, 30 - welding gasket installation groove, 31 - heat preservation block, 32 - cross reinforcement structure, 33 - bottom plate, 34 - installation fixing hole, 35 - distance bolt hole, 36 - strip clamping plate, 37 - sealing metal sheet, 38 - sealing metal sheet installation groove, 39 - fixed welding plate installation groove, 40 - fixed welding plate, 41 - welding base, 42 - nut, 43 - metal connecting rod, 44 - undercut thread, 45 - connecting metal sheet, 46 - cap rod structure, 47 - pressure block bottom metal plate, 48 - disc spring, 49 - locking cap, 50 - locking plate, 51 - bridge block, 52 - spring, 53 - long bolt, 54 - pressure block top metal plate, 55 - gasket, 56 - double-headed screw rod, 57 - metal sealing cap. DETAILED DESCRIPTION

[0049] For better understanding of the technical solutions of the present application, the present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0050] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0051] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the attached drawings.

[0052] It should also be understood that, although the present application has been described herein with reference to particular embodiments thereof, many other

[0053] 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 in which:

[0054] Specific embodiments of the present application are described hereinafter with reference to the drawings; however, it will be understood that the described embodiments are merely examples of the present application, which can be implemented in numerous ways. Well-known and / or redundant functions and structures are not described in detail in order to avoid obscuring the present application by unnecessary detail, to discern the true intent of the application, and to avoid obscuring the present application by unnecessary detail. Accordingly, the specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriate detailed structure.

[0055] This specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more embodiments of the application.

[0056] The present application provides a method for installing a thin film type containment system for carrying low temperature liquefied gas, as shown in Figures 1 to 8 The thin film type containment system is used to contain ultra-low temperature medium, and includes a main layer film layer 5, a fastening card board 6, a main layer insulation layer 4, a secondary layer film layer 3 and a secondary layer insulation layer 2 which are sequentially connected and fixed to a ship structure through a through fastener 1. The main layer film layer 5, the main layer insulation layer 4, the secondary layer film layer 3 and the secondary layer insulation layer 2 form a low temperature liquid cargo storage tank for containing ultra-low temperature medium. Meanwhile, a space between the main layer film layer 5 and the secondary layer film layer 3 forms a main layer shielding space, and a space between the secondary layer insulation layer 3 and the ship structure forms a secondary layer shielding space. In a planar area in the thin film type containment system, the method for installing the thin film type containment system includes the following steps, and the details are as follows.

[0057] Before installing the secondary insulation module 16, it is necessary to mark the hull structure of the bulkhead, according to the mark to place the spacer plate 8 on the position of the bulkhead, and weld the stud vertically arranged on the bulkhead, and install the spacer plate 8 sleeved on the stud, wherein the four corners of the spacer plate 8 are symmetrically arranged about the center line of the spacer plate, and four through holes are arranged in the four corners, and a stud is arranged in each through hole.

[0058] The through fastener 1 comprises an upper section and a lower section, the upper section comprises a cap rod structure 46, a compression structure, a double-headed screw rod 56 and a metal sealing cap 57, the compression structure comprises a compression block bottom metal plate 47, a disc spring 48, a locking cap 49, a locking plate 50, a bridge block 51, four springs 52, four long bolts 53, a compression block top metal plate 54 and four gaskets 55; the lower section comprises a welding base 41 and a nut 42 contained in the welding base 41, a metal connecting rod 43 and a truncated thread 44 arranged at the upper end of the metal connecting rod 43, wherein the compression structure is arranged in the installation gap of the upper thermal insulation block 19 of the primary insulation module 14, the lower part of the compression structure is attached to the fixed pad 23, the cap rod structure 46 is connected and fixed with the truncated thread 44 of the metal connecting rod 43 through the connecting metal sheet 45, and the connecting metal sheet 45 is fixed on the corresponding position of the secondary layer film 15, and the cap rod structure 46 is locked with the compression structure; the welding base 41 of the through fastener is welded at the corresponding position of the hull structure where the through fastener is placed, the welding base contains a nut 42, and the metal connecting rod 43 of the through fastener 1 is installed in the welding base 41 through the nut 42, and the metal connecting rod 43 is arranged in the installation and fixing hole 34 of the cross reinforcement structure 32 of the secondary insulation module 16.

[0059] Each stud on the spacer 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 arranged in a rectangular shape, and distance stud holes 35 are arranged at the four corners, the distance stud holes 35 are used to accommodate the studs arranged on the spacer plate 8 and the fastening nuts threaded with the studs.

[0060] Each secondary insulation module 16 comprises a second top plate 28, a cross- strengthening structure 32 and a bottom plate 33 fixedly connected in sequence from top to bottom, the top of the second top plate 28 is provided with a welding plate mounting groove 29 and a welding gasket mounting groove 30, after the top welding plate 26 and the top welding gasket 27 are respectively installed in the welding plate mounting groove 29 and the welding gasket mounting groove 30, the upper surface of the top welding plate 26 and the upper surface of the top welding gasket 27 are flush with the upper surface of the second top plate 28, the welding gasket mounting groove 30 is located at the center position of the upper surface of the second top plate 28, the top welding plate 26 has a rectangular structure, the welding plate mounting groove 29 is adapted in size and shape to the top welding plate 26, the length of the welding plate mounting groove 29 is slightly larger than the length of the top welding plate 26, the welding plate mounting groove 29 is located at the center of the four edges of the second top plate 28, the short edge of the welding plate mounting groove 29 coincides with the edge of the secondary insulation module 16, and the second top plate 28, the top welding plate 26 and the top welding gasket 27 can be connected by glue or rivets. The second top plate 28 and the bottom plate 33 are provided with a heat preservation block 31, the heat preservation block 31 is fixedly arranged in a space formed by the second top plate 28, the bottom plate 33 and the cross-strengthening structure 32, and the heat preservation block 31 has the same size and shape as the space, the cross center of the cross-strengthening structure 32 is provided with a mounting fixing hole 34 for installing the penetrating fastener 1, and the second top plate 28 and the bottom plate 33 are each provided with a mounting fixing hole 34 corresponding to the mounting fixing hole 34 of the cross-strengthening structure 32;

[0061] Meanwhile, the bottom plate 33 is further provided with an opening hole concentrically arranged with the fixed-distance bolt hole 35, and the second top plate 28 and the heat preservation block 31 are provided with a fixed-distance bolt hole 35 concentrically arranged with the through hole and having a hole diameter 2-4 times that of the through hole, thereby facilitating locking of the gasket, the fastening nut and the tooling tool. Further, after the stud on the fixed-distance plate 8 is locked by the nut, the fixed-distance bolt hole 35 formed on each secondary insulation module is filled with a plunger made of the same material as the heat preservation block 31, so that the effect of interconnection between each secondary insulation module 16 is achieved, and each secondary insulation module 16 plays an auxiliary anchoring role.

[0062] In the embodiment, the fixed-distance plate 8 is made of plywood or a plastic alternative material meeting the rigidity requirement, and has a thickness of at least one of 1 mm, 2 mm, 5 mm or 10 mm, and is used for leveling, and the distance between the bottom plate 33 of the secondary insulation module 16 and the bulkhead is 10 mm by using fixed-distance plates of different thicknesses to be stacked and combined. The diameter of the through hole in the fixed-distance plate 8 is greater than the outer diameter of the thread on the stud by 0.5-2 mm.

[0063] After the secondary insulation module 16 is installed to the spacer plate 8, the installation of the through fastener 1 is carried out, the metal connecting rod 43 of the through fastener 1 is arranged in the installation fixing hole 34 in the middle of the secondary insulation module 16, and the cap rod structure 46 of the upper section of the through fastener 1 (specifically, the cylindrical cap provided by the cap rod structure 46 of the upper section) is screwed and fixed with the metal connecting rod 43. The connecting pair of the lower section of the through fastener 1 plays a main anchoring role for each secondary insulation module 16 in the planar area, and meanwhile, the spacer plate 8, the resin strip 7 and the lower section of the through fastener 1 can effectively anchor the secondary insulation layer 2 of the whole envelope system to the inner bulkhead.

[0064] In the embodiment, during the installation of the secondary insulation module 16 on the upper part and the top of the bulkhead, the temporary stability of the lifting device is required after the secondary insulation module 16 and the spacer plate 8 are installed, and the cap rod structure 46 of the upper section of the through fastener 1 is screwed and fixed with the metal connecting rod 43. Meanwhile, the connecting metal sheet 45 is fixed to the surface of the secondary layer film layer 3 through the cap rod structure 46, and the connecting metal sheet 45, the secondary layer film 15 and the cap rod structure 46 are sealed and fixed by welding, and then the lifting device is removed.

[0065] The hole diameter of the opening hole for installing the stud in the bottom plate 33 of the secondary insulation module 16 is greater than the outer diameter of the thread on the stud by 0.5-2 mm.

[0066] After the installation of the secondary insulation layer 2 is completed, the installation of the secondary layer film layer 3 is carried out, the boundary of each secondary layer film 15 is welded and fixed with the top welding plate 26 or the top welding gasket 27 provided on the second top plate 28 of the secondary insulation module 16, and after a single secondary layer film 15 is placed in the corresponding position, a heat protection layer is laid at the position where the boundary of the secondary layer film 15 does not contact the top welding plate 26 and the top welding gasket 27. The position where the secondary layer film 15 contacts the top welding plate 26 or the position where the secondary layer film 15 contacts the top welding gasket 27 is intermittently spot-welded, and after the whole secondary layer film 15 is welded, the adjacent secondary layer film 15 is overlapped on the previous secondary layer film 15, and the overlapping edge is continuously welded. The welding and sealing between the secondary layer films in the planar area are carried out in this way.

[0067] In the embodiment, the secondary layer film 15 in the secondary layer film layer 3 is made of invar steel or 304L stainless steel which is preformed into a set corrugated shape. The secondary insulation layer 2 includes a plurality of secondary insulation modules 16 which are spaced and arranged in a matrix form, and the second gap 9 between the two adjacent secondary insulation modules 16 is filled with a flexible thermal insulation material.

[0068] The secondary film layer 3 can receive the ultra-low temperature medium when the primary film layer 5 leaks, thereby avoiding the safety risk caused by the contact between the ship structure and the ultra-low temperature medium. The secondary film layer 15 is made of preformed corrugated shape inlaid steel or 304L stainless steel material.

[0069] After the installation of the secondary film layer 3 is completed, the installation of the primary insulation module 14 is performed. The primary insulation module 14 in the planar area has a cuboid structure. Each primary insulation module 14 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 sequentially fixed and connected from top to bottom. The first top plate 17 is located at the top of each component in the primary insulation module 14 and is a rectangular plate. According to the structure of the primary film layer 5 covered thereon, the first top plate 17 is provided with a through stress release slot 18. The upper thermal insulation block 19 is located below the first top plate 17 and is also a rectangular plate. The upper thermal insulation block 19 is fixedly connected to the first top plate 17 by glue. The upper thermal insulation block 19 is provided with a non-through stress release slot 20 which is aligned with the through stress release slot 18 provided on the first top plate 17. The rectangular area of the upper thermal insulation block 19 is larger than that of the first top plate 17. The first top plate 17 is located in the rectangular middle part of the upper thermal insulation block 19, specifically at the center of the rectangular upper thermal insulation block 19. The middle plate 22 and the lower thermal insulation block 24 which are sequentially arranged below the upper thermal insulation block 19 have the same size as the upper thermal insulation block 19. The middle plate 22 is fixedly connected to the upper thermal insulation block 19 by glue and completely coincides with the upper thermal insulation block 19. The lower thermal insulation block 24 is fixedly connected to the middle plate 22 by glue and completely coincides with the middle plate 22. The upper thermal insulation block 19 and the lower thermal insulation block 24 which are arranged in a cuboid structure are provided with a through fastener mounting gap 21 at the four vertices and the middle points of the long sides for mounting the through fastener 1. The through fastener mounting gap 21 on the upper thermal insulation block 19 and the lower thermal insulation block 24 has the same shape and size. The middle plate 22 is provided with a fixed pad 23 at the four vertices and the middle points of the long sides. The shape of the part of the fixed pad 23 in the lower thermal insulation block 24 is matched with the shape of the through fastener mounting gap 21 on the lower thermal insulation block 24, that is, the shape and size of the fixed pad 23 are consistent with those of the through fastener mounting gap 21 of the lower thermal insulation block 24, and the fixed pad 23 can fill the through fastener mounting gap 21 formed on the lower thermal insulation block 24. The part of the fixed pad 23 in contact with the lower thermal insulation block 24 is fixedly bonded by glue. The bottom of the lower thermal insulation block 24 is provided with a secondary film adaptation groove 25 for accommodating the protruding structure on the secondary film layer 3 according to the shape and arrangement of the secondary film layer 3 in contact therewith.

[0070] Further, in combination with the structure of the main insulation module, it can be seen that in the planar area, the main layer insulation layer 4 comprises a plurality of main insulation modules 14 arranged in a matrix, and the first gap 10 between two adjacent main insulation modules 14 is filled with flexible thermal insulation material. Each main insulation module 14 is in compression connection with the upper segment 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 edges of the main insulation module 14 arranged in a cuboid structure. After the four main insulation modules 14 corresponding to the same corner are arranged, the compression structure of the through fastener 1 is installed at the corner, the bottom metal plate of the compression structure is pressed on the middle plate 22 of the four adjacent main insulation modules 14, and the top metal plate 54 of the compression structure of the through fastener 1 arranged at the midpoint of the long edge of the adjacent main insulation module 14 is on the middle plate 22 of the adjacent main insulation module 14. The compression structure is respectively fixedly connected with the upper end of the metal connecting rod 43 and locked.

[0071] The fastening card plate 6 arranged at the upper part of the first gap 10 formed by the two adjacent main insulation modules 14 is installed, and the fastening card plate 6 is in a cross-shaped structure or a linear structure, that is, the fastening card plate 6 comprises a cross-shaped fastening card plate 12 and a linear fastening card plate 13. The cross-shaped fastening card plate 12 and the linear fastening card plate 13 comprise a strip-shaped card plate 36 and are made of a non-metal plate material which 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 40 and a sealing metal sheet 37 for welding with the main layer film 11. Specifically, the four long edges of the cross-shaped fastening card plate 12 and the two long edges of the linear fastening card plate 13 are fixedly provided with a fixed welding plate 40 for welding with the main layer film 11, and the fixed welding plate 40 is installed in the fixed welding plate mounting groove 39 arranged on the four long edges of the cross-shaped fastening card plate 12 and the two long edges of the linear fastening card plate 13. At the same time, the cross center of the cross-shaped fastening card plate 12 and the linear center of the linear fastening card plate 13 are provided with a mounting fixed hole 34 for arranging the through fastener 1, thereby facilitating the installation and fixation of the through fastener 1. As an example, the fastening card plate 6 is made of a plate made of glued wood or alternative materials that meet the rigidity requirements, and the thickness of the card plate is in the range of 6mm-15mm. The upper end of the mounting fixed hole 34 arranged on the fastening card plate 6 forms a circular sealing metal sheet mounting groove 38 with a diameter of 60-120mm and a depth of 1.5-3mm, and the recess is embedded with a sealing metal sheet 37 with a center hole matching the size of the recess.

[0072] After the fastening card 6 is installed, the main layer film layer 5 is installed, and the boundary of each main layer film 11 is welded and fixed with the fixed welding plate 40 and the sealing metal sheet 37 on the fastening card 6 on the main insulation module 14, and the installation of the main layer film layer 5 specifically includes: the first main layer film 11 installed on the welding plate is fixed on the fixed welding plate 40 and the sealing metal sheet 37 in a intermittent spot welding manner, the main layer film 11 adjacent to the first main layer film 11 is overlapped on the first main layer film 11, the overlapped part is sealed and welded in a whole line, the boundary of the main layer film 11 on the sealing metal sheet 37 in the through hole in the middle position of the fastening card 6 is welded on the sealing metal sheet 37, and the upper end metal sealing cap 57 penetrating the upper segment of the fastening member is welded on the sealing metal sheet 37, so as to realize the sealing of the whole main layer film layer.

[0073] In the embodiment, the main layer film 11 of the main layer film layer 5 is made of invar steel or 304L stainless steel with a preset corrugated shape.

[0074] In the above embodiment, the temperature sensor and the combustible gas sensor are respectively installed in the main layer shielding space and the secondary layer shielding space to detect whether there is leakage of the ultra-low temperature medium.

[0075] In the above embodiment, the first top plate 17, the middle plate 22, the second top plate 28, the cross reinforcing structure 32 and the bottom plate 33 are all made of a low-temperature-resistant non-metallic material with a preset strength, wherein the low-temperature-resistant non-metallic material can resist a temperature of minus 196 degrees Celsius, and the strength is greater than or equal to 4.0 MPa.

[0076] Meanwhile, the upper heat preservation block, the lower heat preservation block and the heat preservation block are all made of a material meeting a preset thermal conductivity requirement, wherein the preset thermal conductivity requirement is that the thermal conductivity is not greater than 0.1 W / (m·K).

[0077] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. A method of installing a thin-film enclosure system for carrying a cryogenic liquefied gas, characterized by, The film type containment system is used to contain ultra-low temperature medium, and includes a main layer film layer, a fastening plate, a main layer insulation layer, a secondary layer 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 the planar area of the film type containment system, the installation method comprises: installing a spacer plate on the bulkhead of the hull structure according to a set line, and installing a secondary insulation module on the spacer plate, wherein the secondary insulation modules in the planar area are arranged in a rectangular shape; after the secondary insulation module is installed on the spacer plate, the installation is fixed by penetrating fasteners, wherein a welding base for fixing the penetrating fastener is welded at a corresponding position of the hull structure provided with the penetrating fastener; after the secondary layer insulation layer is installed, the secondary layer film layer is installed, the boundary of each secondary layer film is welded and fixed with a top welding plate or a top welding gasket provided on the second top plate of the secondary insulation module, and a heat protection layer is laid at a position where the secondary layer film boundary does not contact the top welding plate and the top welding gasket after a single secondary layer film is placed at a corresponding position; after the installation of the secondary layer film layer is completed, the installation of the main insulation module is performed, and each main insulation module in the planar area is connected by pressing six upper segment portions of penetrating fasteners, and the six penetrating fasteners are respectively arranged at four corner positions and midpoint positions of two long sides of the main insulation module arranged in a cuboid structure; after four main insulation modules corresponding to the same corner are arranged, a pressing structure of the corresponding penetrating fastener is installed at the corner where the four main insulation modules are arranged, wherein the main insulation modules in the planar area are arranged in a cuboid structure, each main insulation module includes a first top plate, an upper heat preservation block, a middle plate and a lower heat preservation block which are sequentially fixed and connected from top to bottom, the first top plate is a rectangular plate at the top of each component of the main insulation module, and a penetrating stress release slot is arranged on the first top plate according to the structure of the main layer film layer, the upper heat preservation block is a rectangular plate below the first top plate and is fixed and connected to the first top plate by glue, the upper heat preservation block is provided with a non-penetrating stress release slot aligned with the penetrating stress release slot arranged on the first top plate, the upper heat preservation block has a larger rectangular area than the first top plate, the middle plate is fixed and connected to the upper heat preservation block by glue and completely overlaps the upper heat preservation block, the lower heat preservation block is fixed and connected to the middle plate by glue and completely overlaps the middle plate, and the upper heat preservation block and the lower heat preservation block arranged in a cuboid structure are provided with penetrating fastener installation notches for installing penetrating fasteners at four vertexes and midpoint positions of long sides; a fastening plate arranged at the upper part of a first gap formed by two adjacent main insulation modules is installed, and the fastening plate is arranged in a cross structure or a linear structure. After the fastening cardboards are installed, the main layer film layer is installed, and the edges of each main layer film are welded and fixed with the fixed welding plates and sealing metal sheets on the fastening cardboards on the main insulation module.

2. A method of installing a thin film envelope system carrying cryogenic liquefied gas according to claim 1, wherein The method comprises the following steps: The cabin bulkhead of the ship structure is marked, and a stud vertically arranged on the cabin bulkhead is welded at a position on the cabin bulkhead for placing the distance plate, and the distance plate is arranged on the stud, wherein the distance plate is symmetrically provided with four through holes at four corners of the distance plate, and a stud is arranged in 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 planar area are provided with distance bolt holes at four corners, and the distance bolt holes are used to accommodate the studs arranged on the distance plate and the fastening nuts threadedly connected with the studs.

3. The method of claim 2, wherein The welding base contains a nut, and the metal connecting rod of the through fastener is arranged in the installation fixing hole in the middle of the secondary insulation module, the cap rod structure of the upper segment of the through fastener is threadedly fixed with the metal connecting rod, and the lower segment of the through fastener is used to anchor the secondary insulation module in the planar area.

4. A method of installing a thin film envelope system carrying cryogenic liquefied gas according to claim 3, wherein When the secondary layer film layer is installed, the method further comprises the following steps: The positions where the secondary layer film contacts the top welding plate or the positions where the secondary layer film contacts the top welding gasket are spot welded, after an entire secondary layer film is welded, the adjacent secondary layer film is overlapped on the previous secondary layer film, and the overlapping edges are continuously welded; the above steps are repeated until the secondary layer films in the planar area are welded and sealed.

5. The method of claim 4, wherein The pressing block bottom metal plate 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 pressing block top metal plate of the pressing structure of the through fastener arranged at the middle point of the long edges of the adjacent two main insulation modules is arranged on the middle plate of the adjacent main insulation modules, and the pressing structures of the through fasteners are respectively fixed and locked with the upper ends of the metal connecting rods.

6. The method of claim 5, wherein The fastening cardboards include cross-shaped fastening cardboards and one-letter-shaped fastening cardboards, are made of non-metal plates with low-temperature resistance, the upper surfaces of the fastening cardboards contact the main layer film layer, and are provided with fixed welding plates and sealing metal sheets for welding with the main layer film, and the four long edges of the cross-shaped fastening cardboards and the two long edges of the one-letter-shaped fastening cardboards are fixed with the fixed welding plates for welding and fixing with the main layer film; The cross center of the cross-shaped fastening cardboard and the one-letter center of the one-letter-shaped fastening cardboard are provided with installation fixing holes for arranging the through fasteners.

7. The method of claim 6, wherein the boundary of each primary layer film is welded to a fixed welding plate or a sealing metal sheet on the fastening plate of the primary insulation module, and the method comprises the following steps: the first primary layer film is fixed to the fixed welding plate and the sealing metal sheet by spot welding, the adjacent primary layer film is overlapped on the first primary layer film, the overlapped part is sealed by continuous welding, the boundary of the primary layer film on the sealing metal sheet is welded to the sealing metal sheet, and the upper end metal sealing cap of the upper part of the fastener is welded to the sealing metal sheet, thereby achieving the sealing of the entire primary layer film. the boundary of each secondary layer film is welded to the top welding plate or the top welding gasket on the top of the secondary insulation module, and the method comprises the following steps:

8. A method of installing a thin film envelope system carrying cryogenic liquefied gas according to claim 7, wherein the boundary of each secondary layer film is welded to the top welding plate or the top welding gasket on the second top plate of the secondary insulation module, the heat protection layer is laid at the position where the boundary of the secondary layer film does not contact the top welding plate and the top welding gasket after the single secondary layer film is placed in the corresponding position, the position where the secondary layer film contacts the top welding plate or the position where the secondary layer film contacts the top welding gasket is spot welded, the adjacent secondary layer film is overlapped on the previous secondary layer film after the entire secondary layer film is welded, and the overlapped edge is continuously welded, and the above steps are repeated until the secondary layer films in the plane area are sealed.

9. The method of claim 8, wherein the distance plate is made of plywood or plastic alternative materials that meet 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, and the distance between the bottom plate of the secondary insulation module and the bulkhead is 10 mm by using distance plates with different thicknesses to stack and combine, and 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.

10. The method of claim 9, wherein the bottom plate arranged on the bottom surface of the secondary insulation module close to the distance plate is rectangular, and the opening for installing the stud is arranged at the four corners, and the hole diameter of the opening on the bottom plate is greater than the outer diameter of the thread on the stud by 0.5-2 mm.

11. The method of claim 10, wherein ​ ​ ​ During the installation process 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. The cap rod structure on the upper part of the through fastener is screwed and fixed with the metal connecting rod. At the same time, the connecting metal sheet of the through fastener is fixed to the surface of the secondary layer film layer through the cap rod structure, and after the connecting metal sheet, the secondary layer film and the cap rod structure are sealed and fixed by welding, the lifting device is removed.

12. The method of claim 11, wherein the method further comprises: The top plate of the secondary insulation module is provided with top welding plates arranged in a cross shape and top welding plates arranged in a straight line, which are arranged in the same direction and staggered in sequence, and the top welding plates and the top welding plates are riveted or glued to the top plate of the secondary insulation module, and the upper surfaces of the top welding plates and the top welding pads are flush with the upper surface of the second top plate.

13. The method of claim 12, wherein the method further comprises: The top plate of the main insulation module is provided with fixed welding plates arranged in a cross shape and fixed welding plates arranged in a straight line, which are arranged in the same direction and staggered in sequence, and the fixed welding plates and the fixed welding plates are fixedly connected with the fastening clamping plate and arranged flush on the upper surface; The fastening clamping plate is made of plywood or alternative materials that meet the rigidity requirements, and the thickness of the clamping plate is 6-15mm; The upper end of the through hole provided on the fastening clamping plate is formed with a circular groove with a diameter of 60-120mm and a depth of 1.5-3mm, and a sealing metal sheet with a center hole matching the size of the groove is embedded in the circular groove.

14. The method of claim 13, wherein the method further comprises: The main insulation layer includes a plurality of main insulation modules arranged in a matrix, and the first gap between adjacent main insulation modules is filled with flexible insulation material; wherein the main insulation module in the plane area is in a cuboid 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 in sequence from top to bottom, the first top plate is provided with a through-type stress release slot according to the structure of the main film layer covered thereon, the upper insulation block is provided with a non-through-type stress release slot aligned with the stress release slot provided on the first top plate, and the lower insulation block is provided with a secondary film adaptation groove for accommodating the protruding structure on the secondary film layer according to the shape and arrangement of the secondary film layer in contact therewith.

15. The method of claim 14, wherein the secondary film in the secondary film layer is made of invar steel or 304L stainless steel with a preset corrugated shape. ​ The secondary insulation layer comprises a plurality of secondary insulation modules arranged in a matrix form with intervals, and a flexible thermal insulation material is filled in second gaps between adjacent two secondary insulation modules. The space between the primary layer film layer and the secondary layer film layer forms a primary layer shielding space, and the space between the secondary insulation 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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