Low temperature liquid cargo sealed and insulated tank

Abstract

The application discloses a low-temperature liquid cargo sealed and heat-insulated storage tank and relates to the technical field of low-temperature storage and transportation equipment. The storage tank comprises, from outside to inside, a supporting wall, a secondary heat-insulating layer, a secondary shielding layer, a main heat-insulating layer and a main shielding layer. The secondary insulation box of the secondary heat-insulating layer is fixed to the supporting wall through the short bolts of the first anchoring device and the first nuts. The through holes for the short bolts are provided with heat-insulating filling pieces. The inner side is provided with non-continuous secondary anchoring strips which are welded and fixed with the secondary corrugated plates of the secondary shielding layer. The inner side of the main insulation box of the main heat-insulating layer is provided with non-continuous main anchoring strips which are welded and fixed with the main corrugated plates of the main shielding layer. The corner part is provided with a chamfered corner structure. Four adjacent main insulation boxes are spliced to form a central gap. The interlayer cooperative fastening of the secondary insulation box, the secondary corrugated plate and the main insulation box is completed through the fixing elements, the pressing plates and the fastening elements of the second anchoring device. The application significantly reduces the cold leakage loss of the storage tank, balances the stress distribution through the overall anchoring arrangement and improves the anchoring reliability of the tank body.

Description

Technical Field

[0001] This invention relates to the field of storage tank technology, and more specifically to a cryogenic liquid cargo sealed and insulated storage tank. Background Technology

[0002] Cryogenic cargo sealed and insulated storage tanks are core equipment for the storage and transportation of cryogenic media such as liquefied natural gas. They are widely used in onshore receiving stations, shipping, and other scenarios, and have stringent requirements for the tank's insulation and sealing performance, structural anchoring reliability, and adaptability to cryogenic deformation. Currently, most mainstream membrane-type cryogenic storage tanks adopt a multi-layer composite structure with a concrete support wall, an inner shielding layer, and an insulation layer, and the positioning and fixation of each layer are achieved through an anchoring structure.

[0003] Existing conventional storage tanks mostly adopt a portal wedge block combined with a through-type metal screw anchoring structure. The metal screw penetrates multiple layers of insulation and shielding structure throughout, which not only causes serious cold leakage and reduces the insulation performance of the storage tank, but also damages the structural integrity of the shielding layer. Under long-term low-temperature conditions, it is prone to sealing failure and media leakage, posing safety hazards.

[0004] To avoid the cold leakage problem caused by the continuous long metal screw, some improved solutions adopt a decentralized fixing structure of small-block insulation boxes, eliminating the continuous long metal screw. However, this solution has the drawback of unreasonable fixed point layout. When the storage tank shrinks at low temperature, the shrinkage of each layer of the structure varies greatly, resulting in uneven stress distribution. This can easily lead to problems such as misalignment of insulation box splicing and damage to the shielding layer. At the same time, the assembly process of the small-block structure is cumbersome and the construction efficiency is low.

[0005] In summary, existing cryogenic liquid cargo storage tanks cannot simultaneously achieve thermal insulation and sealing performance, structural reliability, and low-temperature deformation adaptability, thus failing to meet the long-term safe and stable operation requirements of large cryogenic storage tanks. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of existing cryogenic liquid cargo sealed insulated storage tanks, such as severe cold leakage from the through-type long metal screw, poor reliability of layer anchoring connections, and uneven structural stress distribution. To achieve the above objective, this invention provides a cryogenic liquid cargo sealed insulated storage tank, wherein the tank comprises, from the outside to the inside:

[0007] Support wall,

[0008] The secondary insulation layer includes multiple rectangular secondary insulation boxes, each with at least two through holes on its side; it also includes multiple first anchoring devices, each consisting of a short bolt and a first nut. One end of the short bolt is fixed to the support wall, and the other end passes through the through hole. The first nut is disposed in the through hole and connected to the short bolt, thereby fixing the secondary insulation box to the support wall. A filler is disposed in the through hole. The secondary insulation box includes a secondary upper plate, a secondary lower plate, and a secondary insulation block located between the secondary upper plate and the secondary lower plate, and its inner surface includes at least two mutually perpendicular and intersecting discontinuous secondary anchoring strips.

[0009] The secondary shielding layer is composed of multiple secondary corrugated plates, the edges of which are welded to the secondary anchoring strip; the secondary corrugated plate includes a secondary planar portion and a secondary corrugated portion;

[0010] The main insulation layer includes multiple main insulation boxes. Each main insulation box includes a main upper plate, a main lower plate, and a main insulation block located between the main upper plate and the main lower plate. The inner surface of each main insulation box includes at least one discontinuous main anchoring strip. The main shielding layer contacts the cryogenic liquid cargo inside the storage tank and is composed of multiple main corrugated plates. The edges of the main corrugated plates are welded to the main anchoring strips. Each main corrugated plate includes a main flat portion and a main corrugated portion.

[0011] The main upper plate and main insulation block at the four corners of the main insulation box are provided with a chamfered structure to form corner notches. After the four adjacent main insulation boxes are spliced ​​together, the corner notches are enclosed to form a central notch, and the main lower plates are aligned and spliced ​​together.

[0012] The storage tank also includes a plurality of second anchoring devices, each of which includes: a fixing element disposed on the inner side of the secondary insulation box; a pressure plate disposed at the central notch, covering the main lower plate at the corner positions of the four adjacent main insulation boxes; and a fastening element rigidly connected to the fixing element, passing through the secondary flat portion of the secondary corrugated plate and the pressure plate, to fasten the main insulation box, the secondary corrugated plate, and the secondary insulation box together.

[0013] In some embodiments, the filling component includes an upper plywood and a polyurethane foam block, the upper plywood and the polyurethane foam block being bonded together. The size of the upper plywood is larger than the size of the bonding surface of the polyurethane foam block, and the edge of the upper plywood completely covers the bonding surface of the polyurethane foam block. The inner side of the upper plywood facing the inside of the storage tank is flush with the upper secondary layer plate of the secondary insulation box, and the upper plywood and the upper secondary layer plate are fixed together by door nails. The shape of the polyurethane foam block matches the shape of the through hole. A notch is provided at one end of the polyurethane foam block facing the support wall to accommodate the end of the short bolt and the first nut. In some embodiments, the end of the short bolt is located inside the secondary insulation block of the secondary insulation box, and the first nut is disposed inside the secondary insulation block and screwed to the short bolt to fix the secondary insulation block and the lower secondary layer plate of the secondary insulation box.

[0014] In some embodiments, the end of the short bolt is located on the lower second-layer plate of the secondary insulation box, and the first nut is disposed on the lower second-layer plate and screwed to the short bolt to fix the lower second-layer plate.

[0015] In some embodiments, the fastening element includes a stud and a second nut, the head of the stud being welded to the periphery of the fixing element, and the second nut being disposed on the inner side of the pressure plate facing the main shielding layer.

[0016] In some embodiments, the central notch can be arc-shaped or square, and the shape of the pressure plate corresponds to the shape of the central notch.

[0017] In some embodiments, the second anchoring device and the secondary anchoring strip are offset on the inner side of the secondary insulation box.

[0018] In some embodiments, in a first direction, the size of the main corrugated plate is twice the size of the main insulation box; in a second direction, the size of the main corrugated plate is equal to that of the main insulation box; in both the first and second directions, the edges of the main corrugated plate are staggered with respect to the gaps between two adjacent main insulation boxes.

[0019] In some embodiments, in a first direction, the size of the secondary corrugated plate is twice the size of the secondary insulation box; in a second direction, the size of the secondary corrugated plate is equal to that of the secondary insulation box; in both the first and second directions, the edges of the secondary corrugated plate are staggered with respect to the gaps between two adjacent secondary insulation boxes.

[0020] In some embodiments, in a first direction, the size of the secondary insulation box is twice the size of the primary insulation box, and in a second direction, the size of the secondary insulation box is equal to the size of the primary insulation box; in both the first and second directions, the primary insulation box and the secondary insulation box are arranged in a staggered manner.

[0021] In some embodiments, the main anchoring strip and the main insulation box are fixedly connected or slidably connected by rivets; and / or, the secondary anchoring strip and the secondary insulation box are fixedly connected or slidably connected by rivets.

[0022] In some embodiments, the corrugations on the main corrugated plate are arranged facing inwards towards the inside of the storage tank, and the corrugations on the secondary corrugated plate are arranged facing outwards towards the outside of the storage tank.

[0023] In some embodiments, the main corrugated plate and / or the secondary corrugated plate includes a main body portion and an edge portion disposed around the main body portion, the edge portion being for welding to an edge portion of another corrugated plate; the corrugations have recesses and protrusions, the recesses being disposed on the main body portion and the protrusions being disposed on the edge portions; the recesses are disposed toward the secondary insulation box, and the protrusions are for welding to a protrusion of another secondary corrugated plate.

[0024] In some embodiments, the secondary corrugated portions intersect perpendicularly to form a knot portion, and each side of the rectangular shape of the secondary insulation box is provided with at least one groove for accommodating the knot portion.

[0025] In some implementations, in a third-party direction, the thickness of the primary insulation box is less than or equal to the thickness of the secondary insulation box.

[0026] In some embodiments, the thickness of the main insulation box is 200 mm, and the thickness of the secondary insulation box is 200 mm.

[0027] Compared with the prior art, the present invention, through the above technical solution, has the following significant advantages:

[0028] 1. This invention adopts a layered, non-through anchoring structure. The short bolts of the first anchoring device only fix the secondary insulation box to the supporting wall, and the second anchoring device only achieves interlayer fastening between the secondary insulation box, the secondary shielding layer, and the main insulation box. There is no long screw structure that penetrates the entire tank wall, which significantly reduces the cooling loss of the storage tank and improves the overall heat insulation and cold preservation effect. At the same time, it avoids the damage to the integrity of the shielding layer structure caused by through openings, greatly reduces the risk of sealing failure and leakage of cryogenic liquids, and improves the safety of long-term operation of the storage tank.

[0029] 2. This invention addresses the structural weakness at the corners of the main insulation box by creating a central notch through a chamfered structure. This, combined with a pressure plate and a second anchoring device, enables the coordinated fastening of four adjacent main insulation boxes, significantly strengthening the corner structure and preventing problems such as misalignment, cracking, and detachment. This also significantly improves the overall structural rigidity and load-bearing capacity of the tank.

[0030] 3. This invention, through the staggered arrangement of the primary and secondary corrugated plates and their corresponding insulation boxes, as well as the staggered arrangement between the primary and secondary insulation boxes, can effectively adapt to the differences in shrinkage of different layers under low-temperature conditions in storage tanks, balance the distribution of centripetal shrinkage force in the tank, and avoid local stress concentration. Simultaneously, the use of discontinuous primary and secondary anchoring strips ensures reliable welding and fixing of the corrugated plates while avoiding the limitation of continuous rigid constraints on low-temperature deformation, effectively releasing local stress.

[0031] 4. The main and secondary insulation boxes of this invention adopt a standardized rectangular modular structure, with a dedicated anchoring structure and splicing positioning structure. They eliminate the need for complex portal wedge blocks and long screws for assembly, enabling rapid on-site splicing and anchoring. This greatly simplifies the construction process, shortens the construction cycle, and reduces the difficulty and labor costs of on-site installation. At the same time, the standardized modular structure facilitates later local maintenance and replacement, significantly reducing the operation and maintenance costs of the storage tank throughout its entire life cycle. Attached Figure Description

[0032] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0033] Figure 1 A schematic diagram of a portion of the tank wall of a preferred embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a portion of a secondary insulation box according to a preferred embodiment of the present invention, showing the layered structure of the secondary insulation box;

[0035] Figure 3 This is a schematic diagram of a portion of the main insulation layer in a preferred embodiment of the present invention, showing multiple main insulation boxes;

[0036] Figure 4 This is a schematic diagram of the structure of a secondary corrugated plate according to a preferred embodiment of the present invention;

[0037] Figure 5 This is a partially enlarged structural diagram of the primary and secondary insulation boxes according to a preferred embodiment of the present invention, showing the second anchoring device;

[0038] Figure 6 This is a schematic diagram of the structure of the second anchoring device according to a preferred embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the first anchoring device according to a preferred embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1 storage tank;

[0042] 2. Support wall;

[0043] Three layers of insulation;

[0044] 30 insulation boxes;

[0045] 31 through holes;

[0046] 32 First anchoring device;

[0047] 33 short bolts;

[0048] 34 First nut;

[0049] 35 anchoring strips;

[0050] 36 upper-layer boards;

[0051] 37 lower layer plates;

[0052] 38-times heat insulation block;

[0053] 4 layers of shielding;

[0054] 40-times corrugated board;

[0055] 41st planar section;

[0056] 42nd wave section;

[0057] 5. Main insulation layer;

[0058] 50 main insulation box;

[0059] 51. Main anchoring strip;

[0060] 52 Main upper layer plate;

[0061] 53 Main lower layer plate;

[0062] 54 main insulation blocks;

[0063] 55. Corner notch;

[0064] 56. Center gap;

[0065] 6. Main shielding layer;

[0066] 60 main corrugated plate;

[0067] 61. Main planar section;

[0068] 62 Main corrugations;

[0069] 70 Second anchoring device;

[0070] 71. Fixing components;

[0071] 72 pressure plate;

[0072] 73 Fastening components;

[0073] 90 studs;

[0074] 91. Second nut;

[0075] 100 main body;

[0076] 110 edge portion;

[0077] 120 recessed area;

[0078] 130 protrusions;

[0079] 140. Flower knot section;

[0080] 150 groove. Detailed Implementation

[0081] Now, with reference to the accompanying drawings, specific embodiments of the present invention will be described in detail. It should be noted that the embodiments described herein are merely preferred embodiments of the present invention, and those skilled in the art can conceive of other ways to implement the present invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.

[0082] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] The cryogenic liquid cargo sealed and insulated storage tank 1 provided in this embodiment can be widely used in scenarios such as onshore liquefied natural gas (LNG) receiving stations and liquid cargo tanks of LNG carriers. It is suitable for storing cryogenic liquid cargoes with boiling points below -40°C, such as liquefied natural gas, liquefied ethylene, liquefied petroleum gas, and liquid nitrogen. It has excellent thermal insulation and sealing performance, structural anchoring reliability, and low-temperature deformation adaptability.

[0085] like Figure 1 As shown, the cryogenic liquid cargo sealed and insulated storage tank 1 of this embodiment includes, from the outside in, a supporting wall 2, a secondary insulation layer 3, a secondary shielding layer 4, a primary insulation layer 5, and a primary shielding layer 6, forming a composite protective structure of external support plus double-layer insulation plus double-layer shielding. The supporting wall 2 serves as the load-bearing foundation of the storage tank 1. The secondary insulation layer 3 and the primary insulation layer 5 constitute a double insulation and cold preservation system, preventing the cold energy of the cryogenic liquid cargo from being conducted outwards. The primary shielding layer 6 is the main sealing structure that directly contacts the cryogenic liquid cargo, while the secondary shielding layer 4 is a backup sealing and protective structure. The double shielding layers effectively prevent leakage of the cryogenic liquid cargo, significantly improving the safety redundancy of the storage tank 1's operation.

[0086] The secondary insulation layer 3 is fixed to the inner surface of the supporting wall 2, and the entire structure is supported by the supporting wall 2. The secondary insulation layer 3 includes multiple secondary insulation boxes 30 arranged in an array. The secondary insulation boxes 30 are rectangular in shape parallel to the surface of the supporting wall 2, forming a standardized modular box structure that facilitates rapid on-site assembly.

[0087] In this embodiment, refer to Figure 2 The secondary insulation box 30 has a composite sandwich structure, specifically including a secondary upper layer plate 36, a secondary lower layer plate 37, and a secondary insulation block 38 sandwiched between the secondary upper layer plate 36 and the secondary lower layer plate 37. The secondary upper layer plate 36 and the secondary lower layer plate 37 can be made of plywood; the secondary insulation block 38 is made of rigid polyurethane foam with excellent low-temperature insulation performance.

[0088] At least two through holes 31 are provided on each side of the rectangular surface of the secondary insulation box 30. In this embodiment, a through hole 31 is provided at each of the four corners of the rectangular secondary insulation box 30 to achieve uniform fixation of the corners of the secondary insulation box 30. The four through holes 31 at the corners of the secondary insulation box 30 also provide handling leverage points, which facilitates the hoisting and handling of the secondary insulation box 30 by machines.

[0089] like Figure 1 and Figure 7 As shown, the storage tank 1 is equipped with multiple first anchoring devices 32, each corresponding to a through hole 31, for directly fixing the secondary insulation box 30 to the support wall 2. Specifically, the first anchoring device 32 includes a short bolt 33 and a first nut 34. One end of the short bolt 33 is pre-anchored to the inner surface of the support wall 2, and the bolt shank extends towards the interior of the storage tank 1, with the shank passing through the corresponding through hole 31 at the edge of the secondary insulation box 30. The nut is placed inside the through hole 31 and screwed into the shank of the short bolt 33, thereby securing the secondary insulation box 30 to the support wall 2. In this embodiment, the short bolt 33 only penetrates a local thickness of the secondary insulation box 30, without a long rod structure penetrating the entire secondary insulation box 30, significantly reducing the cooling loss of the storage tank and improving the overall thermal insulation effect.

[0090] A filler is provided in the through hole 31, including an upper plywood and a polyurethane foam block. The polyurethane foam block matches the shape of the through hole 31; for example, when the through hole 31 is cylindrical, the polyurethane foam block is also made into a cylinder; when the through hole 31 is square, the polyurethane foam block is also made into a square. Preferably, the density of the polyurethane foam block is less than the density of the secondary insulation block 38. A notch is provided at the lower end of the polyurethane foam block near the outside of the storage tank 1. When the polyurethane foam block is installed in the through hole 31, the notch can accommodate the rod of the short bolt 33 and the first nut 34, completely filling the gap between the rod of the short bolt 33 and the first nut 34 and the through hole 31, preventing cold leakage from the gap, and at the same time blocking the short bolt 33 and the first nut 34 in the through hole 31 from transferring heat to the inside of the storage tank 1, so as to achieve a better insulation effect.

[0091] An upper plywood sheet covers the polyurethane foam block and is tightly fitted to it. The size of the upper plywood sheet is larger than the size of the surface of the polyurethane foam block that is in contact with it; in other words, the edge of the upper plywood sheet completely covers the surface of the polyurethane foam block. The inner side of the upper plywood sheet facing the inside of the storage tank is flush with the second-upper layer plate 36 of the secondary insulation box 30. The upper plywood sheet and the second-upper layer plate 36 are fixed together by door nails. The end of the short bolt 33 is located on the second-lower layer plate 37 of the secondary insulation box 30. A first nut 34 is provided on the second-lower layer plate 37 and screwed onto the short bolt 33 to fix the second-lower layer plate 37. Specifically, the length of the short bolt 33 is slightly greater than the thickness of the lower second-layer plate 37 of the secondary insulation box 30. The short bolt 33 only penetrates the lower second-layer plate 37 and does not penetrate the secondary insulation block 38 and the upper second-layer plate 36. The nut is directly set on the surface of the lower second-layer plate 37 facing the inside of the storage tank 1 and is screwed and locked with the short bolt 33, which only fixes the lower second-layer plate 37. This structure can minimize the damage to the structural integrity of the secondary insulation block 38 and further improve the heat insulation and cold preservation effect of the secondary insulation layer 3.

[0092] Reference Figure 1 On the inner side of the secondary insulation box 30 facing the inside of the storage tank 1, at least two mutually perpendicular and intersecting secondary anchoring strips 35 are provided. The secondary anchoring strips 35 have a discontinuous segmented structure. The secondary anchoring strips 35 can be made of stainless steel and are fixedly connected to the secondary upper layer plate 36 of the secondary insulation box 30 by rivets. The discontinuous segmented design can ensure the welding and fixing strength of the secondary shielding layer 4 while avoiding the restriction of low-temperature shrinkage deformation of the secondary insulation box 30 by continuous rigid constraints, effectively releasing local shrinkage stress.

[0093] The secondary shielding layer 4 is located inside the secondary insulation layer 3 and serves as a backup sealing layer for the storage tank 1. When the main shielding layer 6 leaks unexpectedly, the secondary shielding layer 4 can provide secondary sealing protection for the cryogenic liquid cargo, preventing the cryogenic medium from directly contacting the support wall 2 and causing structural freezing damage.

[0094] The secondary shielding layer 4 is formed by butt welding of multiple secondary corrugated plates 40 to create a continuous sealing film layer. The secondary corrugated plates 40 are made of low-temperature corrosion resistant metal sheets, specifically 304L austenitic stainless steel. The edges of the secondary corrugated plates 40 are welded and fixed to the secondary anchoring strips 35 on the secondary insulation box 30, achieving a reliable connection between the secondary shielding layer 4 and the secondary insulation layer 3.

[0095] The secondary corrugated plate 40 includes a planar secondary planar portion 41 and a secondary corrugated portion 42 for absorbing deformation. The secondary corrugated portion 42 is a stamped corrugated structure with concave and convex shapes, which can absorb the shrinkage displacement of the storage tank 1 under low-temperature conditions through its own elastic deformation, thereby reducing the tensile stress at the welding position. In this embodiment, the corrugations on the secondary corrugated plate 40 are arranged facing outwards from the storage tank 1, that is, protruding towards the side of the secondary insulation layer 3. This avoids the need to open multiple grooves 150 on the main insulation box 50 to accommodate the corrugated portion, thereby reducing the structural strength of the main insulation box 50 and affecting the supporting effect of the main insulation box 50.

[0096] As a preferred embodiment of this example, Figure 4 As shown, the secondary corrugated plate 40 includes a main body 100 and an edge portion 110 surrounding the main body 100. The edge portion 110 is used for butt welding with the edge portion 110 of another adjacent secondary corrugated plate 40. The corrugated structure of the secondary corrugated plate 40 is provided with a recessed portion 120 and a protruding portion 130. The recessed portion 120 is provided on the main body 100 and is recessed towards the side facing the secondary insulation box 30. The protruding portion 130 is provided on the edge portion 110 and is protruding towards the side facing the inside of the storage tank 1. The protruding portions 130 of two adjacent secondary corrugated plates 40 are butt welded together. Butt welding of the protruding portions 130 together is more convenient than butt welding of the recessed portions 120 together, reducing the difficulty of manual or machine welding. At the same time, the protruding portion 130 is far away from the secondary insulation layer 3, and the heat generated by welding will not damage the secondary upper layer plate 36 and the secondary insulation block 38 of the secondary insulation box 30.

[0097] Furthermore, the secondary corrugated portions 42 of the secondary corrugated plate 40 intersect perpendicularly, forming a knot portion 140 at the intersection. Correspondingly, each side of the rectangular shape of the secondary insulation box 30 is provided with at least one groove 150. The size of the groove 150 is adapted to the size of the knot portion 140 to accommodate the knot portion 140, avoid interference between the knot portion 140 and the secondary insulation box 30, ensure the fit between the secondary corrugated plate 40 and the secondary insulation box 30, and at the same time play a positioning role in the installation of the secondary corrugated plate 40.

[0098] like Figure 1 and Figure 3 As shown, the main insulation layer 5 is located inside the secondary shielding layer 4, forming a double insulation and cold preservation system with the secondary insulation layer 3, further preventing the cold energy of the cryogenic liquid cargo from being conducted outward. The main insulation layer 5 includes multiple main insulation boxes 50 arranged in an array. The surface of the main insulation box 50 parallel to the support wall 2 is rectangular in shape, and it also adopts a standardized modular structure, forming a staggered arrangement with the secondary insulation box 30. The main insulation box 50 is a composite sandwich structure, specifically including a main upper plate 52, a main lower plate 53, and a main insulation block 54 sandwiched between the main upper plate 52 and the main lower plate 53. The materials selected for the main upper plate 52 and the main lower plate 53 are the same as those for the secondary insulation box 30, and the materials selected for the main insulation block 54 are the same as those for the secondary insulation block 38.

[0099] At least one main anchoring strip 51 is provided on the inner side of the main insulation box 50 facing the inside of the storage tank 1. The main anchoring strip 51 is a discontinuous segmented structure, made of stainless steel, and connected to the main upper plate 52 of the main insulation box 50. As an optional implementation, the main anchoring strip 51 and the main insulation box 50 can be fixedly connected by rivets or slidably connected by a groove structure; similarly, the secondary anchoring strip 35 and the secondary insulation box 30 can also be fixedly connected by rivets or slidably connected by a groove. The sliding connection method can further release the displacement caused by low-temperature shrinkage deformation and prevent the anchoring strip from pulling the corrugated plate, which could lead to cracking at the weld position.

[0100] In this embodiment, the four corners of the main insulation box 50 are provided with chamfered structures. Specifically, the upper main plate 52 and the main insulation block 54 at the four corners of the main insulation box 50 are chamfered, with the corner portion of the structure removed to form corner notches 55, while the corners of the lower main plate 53 remain intact. When four adjacent main insulation boxes 50 are spliced ​​in a 2×2 array, the corner notches 55 of the four main insulation boxes 50 together form a central notch 56. At the same time, the lower main plates 53 at the corners of the four adjacent main insulation boxes 50 are aligned and spliced ​​together to form a complete support plane. This chamfered structure can provide installation space for the interlayer anchoring structure without damaging the bottom support structure of the main insulation box 50, while realizing the coordinated fastening of the four adjacent main insulation boxes 50, significantly improving the structural strength of the corner splicing position.

[0101] In the thickness direction (i.e., the third direction) of the storage tank 1, the thickness of the main insulation box 50 is less than or equal to the thickness of the secondary insulation box 30. As a preferred embodiment, the thickness of the main insulation box 50 is 200 mm, and the thickness of the secondary insulation box 30 is also 200 mm. The double insulation layers adopt an equal thickness design, which can ensure the uniformity of the overall insulation performance and facilitate standardized production and assembly.

[0102] Reference Figure 1 The main shielding layer 6 is located inside the main insulation layer 5 and is in direct contact with the cryogenic liquid cargo inside the storage tank 1. It serves as the main sealing structure of the storage tank 1 and bears the main sealing and protection function for the cryogenic liquid cargo. The main shielding layer 6 is formed by butt welding multiple main corrugated plates 60 to form a continuous sealing film layer. The material of the main corrugated plates 60 is the same as that of the secondary corrugated plates 40. The edges of the main corrugated plates 60 are welded and fixed to the main anchoring strips 51 on the main insulation box 50, realizing a reliable connection between the main shielding layer 6 and the main insulation layer 5.

[0103] The main corrugated plate 60 includes a planar main flat portion 61 and a main corrugated portion 62 for absorbing deformation. The main corrugated portion 62 is a stamped and formed concave-convex corrugated structure, which can absorb low-temperature shrinkage displacement through its own elastic deformation. In this embodiment, the corrugations on the main corrugated plate 60 are oriented towards the interior of the storage tank 1, opposite to the corrugation orientation of the secondary corrugated plate 40. This reverse-oriented corrugated structure can avoid the need to open multiple grooves 150 on the main insulation box 50 to accommodate the corrugated portion, thereby reducing the structural strength of the main insulation box 50 and affecting its supporting effect.

[0104] As an optional implementation of this embodiment, the main corrugated plate 60 and the secondary corrugated plate 40 have the same structure. The main corrugated plate 60 can also be provided with a main body portion 100, an edge portion 110, a recessed portion 120 and a protruding portion 130. Adjacent main corrugated plates 60 are butt welded through the protruding portion 130 to improve welding strength and sealing performance.

[0105] like Figure 5 and Figure 6 As shown, the storage tank 1 is also equipped with multiple second anchoring devices 70, which are used to achieve interlayer fastening connection between the secondary insulation box 30, the secondary shielding layer 4 and the main insulation box 50, and to complete the positioning and fixing of the main insulation box 50. The second anchoring device 70 includes a fixing element 71, a pressure plate 72 and a fastening element 73. The fixing element 71 is a metal fixing seat, which is pre-fixed on the inner side of the secondary insulation box 30 facing the secondary shielding layer 4. Specifically, it can be fixed to the secondary upper plate 36 of the secondary insulation box 30 by welding, riveting or other methods. The pressure plate 72 is set at the central notch 56 formed by splicing the four main insulation boxes 50. The lower surface of the pressure plate covers the lower plate 53 of the four adjacent main insulation boxes 50 at the corners, thus simultaneously pressing and limiting the four main insulation boxes 50. The fastening element 73 is rigidly connected to the fixing element 71. The rod of the fastening element 73 passes through the secondary flat part 41 of the secondary corrugated plate 40, and the end extends into the central notch 56 and passes through the pressure plate 72, locking the pressure plate 72, the lower plate 53 of the main insulation box, and the secondary corrugated plate 40, thereby fastening the main insulation box 50, the secondary corrugated plate 40 and the secondary insulation box 30 into one unit.

[0106] In a preferred embodiment of this invention, the fastening element 73 includes a stud 90 and a second nut 91. The head of the stud 90 is fully welded to the end face of the fixing element 71 to ensure connection rigidity and sealing. The rod of the stud 90 passes vertically through the secondary flat portion 41 of the secondary corrugated plate 40. The perforation position of the secondary corrugated plate 40 is sealed by welding to prevent medium leakage. The end of the rod of the stud 90 passes through the central through hole of the pressure plate 72. The second nut 91 is set on the inner side of the pressure plate 72 facing the main shielding layer 6 and is screwed and locked with the stud 90, thereby achieving overall fastening of the interlayer structure.

[0107] The shape of the central notch 56 can be set to be arc-shaped or square according to assembly requirements. Correspondingly, the shape of the pressure plate 72 is adapted to the shape of the central notch 56. For example, when the central notch 56 is circular, the pressure plate 72 is a circular pressure plate; when the central notch 56 is square, the pressure plate 72 is a square pressure plate, ensuring that the pressure plate can completely cover the corner support surfaces of the four main insulation boxes 50 to achieve uniform pressing.

[0108] Furthermore, the second anchoring device 70 and the secondary anchoring strip 35 are staggered on the inner side of the secondary insulation box 30, that is, the installation position of the second anchoring device 70 and the installation position of the secondary anchoring strip 35 are staggered to avoid installation interference between the two, and at the same time, the stress points on the secondary insulation box 30 are more evenly distributed, avoiding local stress concentration.

[0109] like Figure 1As shown in this embodiment, the structure of each layer of the storage tank 1 adopts a staggered arrangement design, which can effectively adapt to the difference in shrinkage of each layer under low temperature conditions and balance the overall shrinkage stress distribution of the tank.

[0110] Specifically, in the first direction, the size of the main corrugated plate 60 is twice the size of the main insulation box 50; in the second direction (perpendicular to the first direction), the size of the main corrugated plate 60 is equal to the size of the main insulation box 50; and in both the first and second directions, the main corrugated plate 60 and the main insulation box 50 are staggered, that is, the weld position of the main corrugated plate 60 is staggered from the splicing gap of the main insulation box 50, so as to avoid the inconvenience of welding when they overlap, and at the same time improve the sealing reliability of the main shielding layer 6.

[0111] In the first direction, the size of the secondary corrugated plate 40 is twice the size of the secondary insulation box 30; in the second direction, the size of the secondary corrugated plate 40 is equal to the size of the secondary insulation box 30; and in both the first and second directions, the secondary corrugated plate 40 and the secondary insulation box 30 are staggered. Similarly, the weld position of the secondary corrugated plate 40 is staggered from the splicing gap of the secondary insulation box 30 to avoid inconvenience in welding when they overlap, and at the same time improve the sealing reliability of the secondary shielding layer 4.

[0112] In the first direction, the size of the secondary insulation box 30 is equal to that of the main insulation box 50. In the second direction, the size of the secondary insulation box 30 is equal to that of the main insulation box 50. Furthermore, in both the first and second directions, the main insulation box 50 and the secondary insulation box 30 are staggered, meaning that the splicing gaps of the main insulation box 50 and the splicing gaps of the secondary insulation box 30 are staggered. This avoids the splicing gaps of the multi-layer structure from overlapping and forming a through-type cold leakage channel, further improving the heat insulation and cold preservation effect. At the same time, it can make the overall stress distribution of the tank body more uniform.

[0113] As an optional implementation of this embodiment, in the first direction, the size of the secondary insulation box 30 is twice the size of the primary insulation box 50, and in the second direction, the size of the secondary insulation box 30 is equal to the size of the primary insulation box 50. Those skilled in the art can set different sizes for the primary insulation box 50 and the secondary insulation box 30 according to actual needs.

[0114] In this embodiment, the cryogenic liquid cargo sealed insulated storage tank 1 has a main insulation box 50 and a secondary insulation box 30, both of which are prefabricated in the factory. Specifically, the main upper plate 52, the main insulation block 54 and the main lower plate 53 of the main insulation box 50 are pressed together to form a layered box, and the secondary upper plate 36, the secondary insulation block 38 and the secondary lower plate 37 of the secondary insulation box 30 are pressed together to form a layered box. The main anchoring strip 51 is pre-installed at a preset position on the inner side of the main insulation box 50, and the secondary anchoring strip 35 is pre-installed at a preset position on the inner side of the secondary insulation box 30.

[0115] On-site assembly can be carried out according to the following steps:

[0116] S1: Pre-treatment of support wall 2 and pre-installation of first anchoring device 32: Short bolts 33 are pre-embedded on the inner surface of support wall 2 at the design points to complete the pre-installation of first anchoring device 32. At the same time, the surface of support wall 2 is leveled to ensure the flatness of the installation of secondary insulation box 30.

[0117] S2: Assembly of secondary insulation layer 3: Align the through hole 31 of the secondary insulation box 30 with the pre-embedded short bolt 33, hoist and splice them piece by piece, and after adjusting them into place, install the first nut 34 in the through hole 31 and lock it to complete the fixation of the secondary insulation box 30 and the support wall 2.

[0118] S3: Assembly of secondary shielding layer 4: The secondary corrugated plates 40 are hoisted into place one by one, and the edges of the secondary corrugated plates 40 are welded and fixed to the secondary anchoring strips 35. The edges of adjacent secondary corrugated plates 40 are butt welded to form an integral and continuous secondary shielding layer 4. At the same time, holes are opened at preset positions on the flat part of the secondary corrugated plates 40 to reserve a channel for the installation of the second anchoring device 70.

[0119] S4: Pre-installation of the second anchoring device 70: Fixing element 71 is fixedly installed at the preset position of the secondary insulation box 30, and the head of the stud 90 is welded to the fixing element 71. The rod of the stud 90 passes through the reserved hole on the plane of the secondary corrugated plate 40, and the reserved hole is sealed by welding.

[0120] S5: Assembly of main insulation layer 5: The main insulation boxes 50 are hoisted and spliced ​​piece by piece. The corners of four adjacent main insulation boxes 50 are enclosed to form a central notch 56. The rod of the stud 90 passes through the central notch 56. After the main insulation boxes 50 are spliced, a pressure plate 72 is placed at the central notch 56 so that the pressure plate 72 covers the corners of the main lower layer plates 53 of the four main insulation boxes 50. The second nut 91 is installed and locked to complete the interlayer fastening of the main insulation box 50, the secondary corrugated plate 40 and the secondary insulation box 30.

[0121] S6: Assembly of main shielding layer 6: The main corrugated plates 60 are hoisted into place one by one, and the edges of the main corrugated plates 60 are welded and fixed to the main anchoring strips 51. The edges of adjacent main corrugated plates 60 are butt welded to form an integral and continuous main shielding layer 6, thus completing the assembly of the overall structure of the storage tank 1.

[0122] In this embodiment, the cryogenic liquid cargo sealed insulated storage tank 1, under cryogenic operating conditions, has the main shielding layer 6 in direct contact with the cryogenic liquid cargo. Through the double insulation structure of the main insulation layer 5 and the secondary insulation layer 3, the cold energy is blocked from being conducted outward. The layered non-through anchoring structure is adopted, with the short bolts 33 only fixing the secondary insulation box 30, and the second anchoring device 70 only achieving interlayer fastening. There are no long screws that penetrate the entire tank wall, thereby significantly reducing cold leakage loss.

[0123] When storage tank 1 undergoes centripetal contraction deformation due to low temperature, the corrugated structure of the main and secondary corrugated plates 40 can absorb the contraction displacement through its own elastic deformation. The discontinuous anchoring strips and staggered layer structure can further release the contraction stress, balance the overall stress distribution of the tank, and avoid the problems of corrugated plate welding cracking and shielding layer damage caused by local stress concentration. The cooperative anchoring structure at the corner of the main insulation box 50 can greatly strengthen the structural strength of the splicing corner, prevent the insulation box splicing from being misaligned or falling off, and at the same time ensure the rigidity and reliability of the interlayer connection.

[0124] The double-shielding design creates two levels of sealing protection. Even if the main shielding layer 6 leaks unexpectedly, the secondary shielding layer 4 can still achieve effective sealing, greatly improving the safety of the storage tank 1. At the same time, the modular insulation box structure enables rapid on-site assembly, greatly simplifying the construction process and shortening the construction cycle.

[0125] The above description of various embodiments of the present invention is provided for illustrative purposes to a person skilled in the art. It is not intended to limit the invention to a single disclosed embodiment. As taught above, those skilled in the art will understand various alternatives and variations of the invention. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all alternatives, modifications, and variations of the invention described herein, as well as other embodiments falling within the spirit and scope of the invention described above.

Claims

1. A cryogenic liquid cargo sealed insulated storage tank (1), characterized in that, The storage tank (1) comprises, from the outside in, the following components: Support wall (2) The secondary insulation layer (3) is fixed to the support wall (2) and supported by the support wall (2); the secondary insulation layer (3) includes multiple secondary insulation boxes (30), the surface of the secondary insulation box (30) parallel to the support wall (2) is rectangular, and at least two through holes (31) are opened on each side of the rectangular shape; the storage tank (1) also includes multiple first anchoring devices (32), the first anchoring device (32) includes a short bolt (33) and a first nut (34), one end of the short bolt (33) is fixed to the support wall (2), and the other end passes through the secondary insulation box (30). The first nut (34) is disposed in the through hole (31) at the edge of the storage tank (1) and connected to the short bolt (33) to fix the secondary insulation box (30) to the support wall (2); a filling component is also provided in the through hole (31); the inner side of the secondary insulation box (30) facing the inside of the storage tank (1) includes at least two mutually perpendicular and intersecting secondary anchoring strips (35), the secondary anchoring strips (35) are discontinuous; the secondary insulation box (30) includes a secondary upper plate (36), a secondary lower plate (37) and a secondary heat insulation block (38) located between the secondary upper plate and the secondary lower plate. The secondary shielding layer (4) is formed by welding multiple secondary corrugated plates (40), the edges of which are welded to the secondary anchoring strip (35); the secondary corrugated plate (40) includes a secondary planar portion (41) and a secondary corrugated portion (42). The main insulation layer (5) includes multiple main insulation boxes (50). The surface of the main insulation box (50) parallel to the support wall (2) is rectangular. The inner side of the main insulation box (50) facing the inside of the storage tank (1) includes at least one main anchoring strip (51). The main anchoring strip (51) is discontinuous. The main insulation box (50) includes a main upper plate (52), a main lower plate (53), and a main insulation block (54) located between the main upper plate (52) and the main lower plate (53). The main shielding layer (6) is in contact with the cryogenic liquid inside the storage tank (1) and is formed by welding multiple main corrugated plates (60). The edges of the main corrugated plates (60) are welded to the main anchoring strip (51). The main corrugated plate (60) includes a main flat part (61) and a main corrugated part (62). The main upper plate (52) and the main heat insulation block (54) at the four corners of the main insulation box (50) are provided with a chamfered structure, which forms a corner notch (55). After the four adjacent main insulation boxes are spliced ​​together, the corner notches (55) together form a central notch (56). The main lower plates (53) at the corner positions of the four adjacent main insulation boxes are aligned and spliced ​​together. The storage tank (1) also includes a plurality of second anchoring devices (70), each second anchoring device (70) including: a fixing element (71), which is fixedly disposed on the inner side of the secondary insulation box (30) facing the secondary shielding layer (4); a pressure plate (72), which is disposed at the central notch (56) and covers the main lower plate (53) at the corner position of the four adjacent main insulation boxes; and a fastening element (73), which is rigidly connected to the fixing element (71) and passes through the secondary flat portion (41) of the secondary corrugated plate (40) and the pressure plate (72) to fasten the main insulation box (50), the secondary corrugated plate (40) and the secondary insulation box (30) together.

2. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The filling component includes an upper plywood and a polyurethane foam block, the upper plywood and the polyurethane foam block are bonded together, the size of the upper plywood is larger than the size of the bonding surface of the polyurethane foam block, and the edge of the upper plywood completely covers the bonding surface of the polyurethane foam block; the inner side of the upper plywood facing the inside of the storage tank (1) is flush with the secondary upper plate (36) of the secondary insulation box (30), and the upper plywood and the secondary upper plate (36) are fixed together by door nails; the shape of the polyurethane foam block matches the shape of the through hole (31); a notch is opened at one end of the polyurethane foam block facing the support wall (2) to accommodate the end of the short bolt (33) and the first nut (34).

3. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The end of the short bolt (33) is located on the lower second-layer plate (37) of the secondary insulation box (30), and the first nut (34) is disposed on the lower second-layer plate (37) and screwed to the short bolt (33) to fix the lower second-layer plate (37).

4. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The fastening element (73) includes a stud (90) and a second nut (91). The head of the stud (90) is welded to the periphery of the fastening element (71), and the second nut (91) is disposed on the inner side of the pressure plate (72) facing the main shielding layer (6).

5. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The central notch (56) is arc-shaped or square, and the shape of the pressure plate (72) corresponds to the shape of the central notch (56).

6. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The second anchoring device (70) and the secondary anchoring strip (35) are offset on the inner side of the secondary insulation box (30).

7. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, In a first direction, the size of the main corrugated plate (60) is twice the size of the main insulation box (50); in a second direction, the size of the main corrugated plate (60) is equal to that of the main insulation box (50); in both the first and second directions, the edges of the main corrugated plate (60) are staggered with the gaps between two adjacent main insulation boxes (50).

8. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, In the first direction, the size of the secondary corrugated plate (40) is twice the size of the secondary insulation box (30); in the second direction, the size of the secondary corrugated plate (40) is equal to that of the secondary insulation box (30); in the first and second directions, the edges of the secondary corrugated plate (40) are staggered with the gaps between two adjacent secondary insulation boxes (30).

9. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, In the first direction, the size of the secondary insulation box (30) is twice the size of the main insulation box (50); in the second direction, the size of the secondary insulation box (30) is equal to the size of the main insulation box (50); in both the first and second directions, the main insulation box (50) and the secondary insulation box (30) are arranged in a staggered manner.

10. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The main anchoring strip (51) and the main insulation box (50) are fixedly connected or slidably connected by rivets; and / or, the secondary anchoring strip (35) and the secondary insulation box (30) are fixedly connected or slidably connected by rivets.

11. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The corrugations on the main corrugated plate (60) are arranged facing the inside of the storage tank (1), and the corrugations on the secondary corrugated plate (40) are arranged facing the outside of the storage tank (1).

12. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The main corrugated plate (60) and / or the secondary corrugated plate (40) include a main body portion (100) and an edge portion (110) disposed around the main body portion (100), the edge portion (110) being used for welding to the edge portion (110) of another corrugated plate; the corrugations have a recess (120) and a protrusion (130), the recess (120) being disposed on the main body portion (100) and the protrusion (130) being disposed on the edge portion (110); the recess (120) being disposed toward the secondary insulation box (30) and the protrusion (130) being used for welding to the protrusion (130) of another secondary corrugated plate.

13. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, The secondary corrugated portions (42) intersect perpendicularly to form a knot portion (140), and at least one groove (150) is provided on each side of the rectangular shape of the secondary insulation box (30) to accommodate the knot portion (140).

14. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 1, characterized in that, In the third direction, the thickness of the main insulation box (50) is less than or equal to the thickness of the secondary insulation box (30).

15. The cryogenic liquid cargo sealed insulated storage tank (1) according to claim 14, characterized in that, The thickness of the main insulation box (50) is 200 mm, and the thickness of the secondary insulation box (30) is 200 mm.

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