Low-temperature liquid cargo containment tank

Abstract

The application discloses a low-temperature liquid cargo sealed storage tank and relates to the technical field of storage and transportation equipment. The low-temperature liquid cargo sealed storage tank comprises a main shielding layer, a main heat insulation layer, a secondary shielding layer and a secondary heat insulation layer which are sequentially and stackingly arranged, and further comprises an anti-convection layer, at least a part of the anti-convection layer is arranged between the main heat insulation layer and the secondary shielding layer, the secondary shielding layer is composed of a plurality of secondary corrugated plates, at least part of the secondary corrugated plates are provided with first corrugated recesses facing the secondary heat insulation layer, at least part of the secondary corrugated plates are provided with first corrugated protrusions facing the main heat insulation layer, and the anti-convection layer can avoid the first corrugated protrusions. The application blocks the convection channel of the low-temperature liquid cargo sealed storage tank by arranging the anti-convection layer between the main heat insulation layer and the secondary shielding layer, and the heat insulation effect of the storage tank is improved.

Description

Technical Field

[0001] This invention relates to the field of storage and transportation equipment technology, and in particular to a cryogenic liquid cargo sealed storage tank. Background Technology

[0002] Membrane tanks are primarily used for storing liquefied natural gas (LNG) and other cryogenic liquids. Due to the low-temperature physical properties of LNG, membrane tanks typically employ stacked shielding and insulation layers to ensure sealing and reduce LNG vaporization during transport. The shielding layer seals the LNG, preventing leakage; the insulation layer protects the membrane tank and reduces the rate of heat exchange between the tank's interior and the external environment.

[0003] However, interlayer gaps or local cavities inevitably exist between adjacent layers. Under the influence of temperature differences, the gas in these spaces is prone to convection, which intensifies heat transfer, leading to a decrease in the overall thermal insulation performance of the storage tank, thereby increasing evaporation loss and affecting the economy and safety of cryogenic liquid cargo storage and transportation.

[0004] Therefore, there is an urgent need for a cryogenic liquid cargo sealed storage tank that can reduce interlayer gas convection, reduce heat leakage, improve insulation effect, and thus improve the storage and transportation efficiency of cryogenic liquid cargo. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, the present invention provides a cryogenic liquid cargo sealed storage tank, comprising: a main shielding layer, a main insulation layer, a secondary shielding layer and a secondary insulation layer stacked and installed in sequence, and further comprising: an anti-convection layer, wherein at least a portion of the anti-convection layer is sandwiched and filled between the main insulation layer and the secondary shielding layer.

[0006] The secondary shielding layer is composed of multiple secondary corrugated plates spliced ​​together. At least a portion of the secondary corrugated plates are provided with a first corrugated recess facing the secondary insulation layer, and at least a portion of the secondary corrugated plates are provided with a first corrugated protrusion facing the main insulation layer. The first corrugated protrusion is a corrugated portion protruding towards the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate, and the first corrugated recess is a corrugated portion protruding away from the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate.

[0007] The anti-convective layer can avoid the first corrugated protrusion.

[0008] In some embodiments, the anti-convection layer is provided with a clearance hole, which is disposed opposite to the first corrugated protrusion, and the first corrugated protrusion is adapted to pass through the clearance hole.

[0009] In some embodiments, at least a portion of the secondary corrugated plate simultaneously has both the first corrugated recess and the first corrugated protrusion.

[0010] In some embodiments, the thickness of the anti-convective layer is D, where 2mm ≤ D ≤ 10mm.

[0011] In some implementations, D=5mm.

[0012] In some embodiments, the anti-convective layer is made of one or more of fibers, polypropylene, and aerogel.

[0013] In some embodiments, the tropospheric structure is a multi-layered structure.

[0014] In some embodiments, the multilayer structure includes upper and lower outermost layers, and intermediate upper and lower layers. The upper and lower outermost layers are made of aluminum foil or a composite of glass fiber and polypropylene. The upper lower layer is made of a flexible material or fiber woven fabric, and the lower lower layer is made of aluminum foil anti-radiation and wear-resistant material.

[0015] In some embodiments, the elastic modulus of the anti-convective layer is A, where 1 MPa ≤ A ≤ 10 MPa.

[0016] In some implementations, A = 4 MPa.

[0017] In some embodiments, the main insulation layer is composed of multiple main insulation modules, with an installation gap between adjacent main insulation modules, and a portion of the anti-convection layer extends and fills the installation gap.

[0018] In some embodiments, the anti-convection layer is also sandwiched between the main shielding layer and the main insulation layer.

[0019] In some embodiments, the main insulation layer is composed of multiple main insulation modules, and the edges of adjacent anti-convection layers are overlapped to form a raised structure, which is located at the installation gap between adjacent main insulation modules.

[0020] In some embodiments, the anti-convection layer is formed as a strip structure, and multiple anti-convection layers are filled in parallel between the main insulation layer and the secondary shielding layer; or, the anti-convection layer is formed as a block structure and is respectively disposed at the outer peripheral edge between the main insulation layer and the secondary shielding layer.

[0021] The beneficial effects of this invention are that by adding an anti-convection layer between the main insulation layer and the secondary shielding layer, it can effectively block the gas flow path between the layers, suppress the formation of convection, thereby reducing interlayer heat leakage and improving the overall thermal insulation performance of the cryogenic liquid cargo sealed storage tank. Furthermore, the anti-convection layer in this invention can structurally avoid the first corrugated protrusion on the secondary corrugated plate that constitutes the secondary shielding layer, preventing interference between the anti-convection layer and the secondary shielding layer, thereby improving the stability of the overall structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an exploded view of a cryogenic liquid cargo sealed storage tank according to one embodiment of the present invention;

[0024] Figure 2 This is an isometric view of the anti-convection layer and secondary shielding layer of a cryogenic liquid cargo sealed storage tank after installation, according to one embodiment of the present invention.

[0025] Figure 3 This is a top view of the anti-convection layer and secondary shielding layer of the cryogenic liquid cargo sealed storage tank after installation, according to another embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the multi-layer structure of the anti-convection layer in one embodiment of the present invention;

[0027] Figure 5 This is a front view of the anti-convection layer and the main insulation layer after installation in one embodiment of the present invention;

[0028] Figure 6 This is a front view of the anti-convection layer and the main insulation layer after installation in another embodiment of the present invention;

[0029] Figure 7 This is an exploded view of a cryogenic liquid cargo sealed storage tank according to one embodiment of the present invention;

[0030] Figure 8 This is an exploded view of a cryogenic liquid cargo sealed storage tank according to one embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the secondary shielding layer in one embodiment of the present invention.

[0032] The reference numerals in the figure are as follows: 10. Main shielding layer, 20. Main insulation layer, 21. Installation gap, 30. Anti-convection layer, 31. Circumvention hole, 32. Sub-layer structure, 33. Circumvention space, 34. Raised structure, 40. Secondary shielding layer, 41. First corrugated protrusion, 42. First corrugated recess, 50. Secondary insulation layer, 61. Upper outermost layer, 62. Second upper layer, 63. Second lower layer, 64. Lower outermost layer. Detailed Implementation

[0033] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] It should be noted that the illustrations provided in the following embodiments are merely schematic representations of the basic concept of the present invention. The accompanying drawings only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the shape, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex. The descriptions of orientations such as "upper," "lower," "inner," "outer," "top surface," "bottom surface," and "side wall" in this specification are mainly for the purpose of facilitating explanation in conjunction with the accompanying drawings and are not intended to limit the spatial posture of the present invention during actual installation or use.

[0035] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0036] Liquid gases, especially liquefied natural gas (LNG), typically require storage and transportation in extremely low-temperature environments. To reduce external heat transfer, minimize evaporation losses, and meet safe storage requirements, membrane storage tank structures are widely used in engineering. Taking the use of membrane storage tanks on LNG carriers as an example, the tank wall usually includes, from the outside in, an outer bulkhead (hull), a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer. The outer bulkhead generally bears the load transmitted by the entire tank system; the primary shielding layer usually faces the cryogenic medium directly, forming the primary sealing boundary; the secondary shielding layer is located between the primary shielding layer and the outer bulkhead, providing secondary shielding in case of an anomaly in the primary shielding layer; the secondary insulation layer is located between the outer bulkhead and the secondary shielding layer, and the primary insulation layer is located between the secondary and primary shielding layers; the secondary and primary insulation layers work together to reduce heat transfer.

[0037] However, interlayer gaps or local cavities inevitably exist between adjacent layers. Gases in these spaces are prone to natural convection under temperature differences, thus exacerbating heat transfer, reducing the overall insulation performance of the tank, and consequently increasing evaporation losses, affecting the economy and safety of cryogenic liquid cargo storage and transportation. For example, due to welded protrusions between the corrugated plates of the secondary shielding layer, local gaps exist between the secondary shielding layer and the main insulation layer, easily leading to convection, heat transfer, and liquid cargo evaporation.

[0038] To address the aforementioned problems, this invention provides a cryogenic liquid cargo sealed storage tank, which sets up an anti-convection layer between the secondary shielding layer and the main insulation layer to block the interlayer convection channel, reduce evaporation loss caused by convection, and thereby improve the transportation efficiency of liquefied natural gas.

[0039] Please see Figures 1 to 9 The cryogenic liquid cargo sealed storage tank in this embodiment includes a main shielding layer 10, a main insulation layer 20, an anti-convection layer 30, a secondary shielding layer 40 and a secondary insulation layer 50 stacked in sequence; at least a portion of the anti-convection layer 30 is sandwiched and filled between the main insulation layer 20 and the secondary shielding layer 40.

[0040] The secondary shielding layer 40 is composed of multiple secondary corrugated plates spliced ​​together. At least a portion of the secondary corrugated plates are provided with a first corrugated recess 42 facing the secondary insulation layer 50, and at least a portion of the secondary corrugated plates are provided with a first corrugated protrusion 41 facing the main insulation layer 20. The first corrugated protrusion 41 is a corrugated portion protruding towards the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate, and the first corrugated recess 42 is a corrugated portion protruding away from the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate.

[0041] The troposphere 30 can avoid the first corrugated protrusion 41.

[0042] The main shielding layer 10 is a liquid-tight layer directly facing the cryogenic liquid cargo, used to achieve the main seal of the cryogenic liquid cargo; the main insulation layer 20 is used to provide the main heat insulation function; the secondary shielding layer 40 is located outside the main insulation layer 20, used to achieve secondary shielding in case of abnormality of the main shielding layer 10; the secondary insulation layer 50 is located outside the secondary shielding layer 40, used to further reduce the transfer of external heat inward, and cooperate with the external load-bearing structure.

[0043] An anti-convection layer 30 is provided between the main insulation layer 20 and the secondary shielding layer 40, with at least a portion of it sandwiched and filled between the two layers. This anti-convection layer 30 creates an additional flow-blocking interface within the existing interlayer cavity. The anti-convection layer 30 forms an airflow blocking layer between the main insulation layer 20 and the secondary shielding layer 40, reducing interlayer convection, decreasing heat transfer caused by convection, thereby reducing heat leakage and improving the storage and transportation efficiency of cryogenic liquid cargo sealed storage tanks.

[0044] In some embodiments, at least a portion of the secondary corrugated plate simultaneously has a first corrugated recess 42 and a first corrugated protrusion 41.

[0045] Please see Figure 9 , Figure 9 The secondary corrugated plate shown has both a first corrugated recess 42 and a first corrugated protrusion 41. By providing the first corrugated recess 42 and the first corrugated protrusion 41 on the secondary corrugated plate, the secondary corrugated plate can provide expansion and contraction compensation under working conditions with temperature differences, and also plays a role in dispersing and transmitting stress, absorbing energy, and buffering.

[0046] For the first corrugated recess 42 and / or the first corrugated protrusion 41 on the secondary corrugated plate, the anti-convective layer 30 can absorb and transition these local unevennesses on the secondary corrugated plate, level the protrusions of the secondary shielding layer 40, and improve the contact uniformity between layers; at the same time, the anti-convective layer 30 avoids the first corrugated protrusion 41 to avoid problems such as stress concentration and unevenness between layers caused by interference and local compression.

[0047] Furthermore, during ship operation, the liquid cargo sloshes. By setting up the anti-convective layer 30, it can play a role in shock absorption, reducing local impact and vibration transmission, and improving the structural stability of the cryogenic liquid cargo sealed storage tank.

[0048] Please see Figure 1 and Figure 2 In one embodiment, the anti-convection layer 30 is provided with a clearance hole 31, which is directly opposite to the first corrugated protrusion 41, and the first corrugated protrusion 41 is adapted to pass through the clearance hole 31.

[0049] When this structure is adopted, the first corrugated protrusion 41 passes through the clearance hole 31, while the remaining area of ​​the anti-convection layer 30 forms an effective fill between the secondary shielding layer 40 and the main insulation layer 20. By providing the clearance hole 31 on the anti-convection layer 30, interference between the anti-convection layer 30 and the first corrugated protrusion 41 is avoided, ensuring the overall flatness after installation, improving the interlayer adhesion, and reducing interlayer convection.

[0050] It should be noted that the clearance hole 31 can be a round hole, an oblong hole, a polygonal hole, an irregularly shaped hole, etc. The size of the clearance hole 31 can be the same as that of the first corrugated protrusion 41; or the clearance hole 31 can be slightly larger than the size of the first corrugated protrusion 41 in the corresponding projection direction, so as to take into account installation tolerances, thermal deformation and assembly convenience. This application does not limit the shape and size of the clearance hole 31.

[0051] Please see Figure 3 In another embodiment, each anti-convective layer 30 includes multiple sub-layer structures 32, which are spliced ​​together, and a clearance space 33 is defined between some adjacent sub-layer structures 32 to avoid the first corrugated protrusion 41.

[0052] In this embodiment, the anti-convective layer 30 does not need to be fabricated with complete holes as a whole. Instead, through the relative arrangement of multiple sub-layer structures 32, a clearance space 33 is naturally formed between adjacent boundaries, allowing the first corrugated protrusion 41 to be located within this clearance space 33. This approach facilitates the modular manufacturing of the anti-convective layer 30 and simplifies on-site assembly, simplifying the manufacturing and assembly of the anti-convective layer 30 in cases where the first corrugated protrusion 41 is complex or irregularly distributed. Furthermore, by flexibly adjusting the arrangement of the multiple sub-layer structures 32, the placement of the first corrugated protrusion 41 can be flexibly adapted to different situations.

[0053] In this embodiment of the invention, the thickness of the anti-convection layer 30 is D, and 2mm≤D≤10mm, preferably, D=5mm.

[0054] If the thickness of the anti-convective layer 30 is too small, its ability to block interlayer airflow will be limited, and its ability to level the secondary shielding layer 40 and its shock absorption effect will be insufficient. If the thickness of the anti-convective layer 30 is too large, it may increase space occupation and reduce the usable liquid cargo storage space, thereby leading to a decrease in transportation efficiency. Therefore, controlling the thickness D of the anti-convective layer 30 within the range of 2mm to 10mm can achieve a good balance between flow obstruction, leveling, shock absorption, and space occupation. Further optimization with D of 5mm can take into account all the effects of the anti-convective layer 30 and achieve a balance between flow obstruction, leveling, shock absorption, and space occupation.

[0055] In this embodiment of the invention, the material of the anti-convection layer 30 may be one or a combination of fiber, polypropylene and aerogel.

[0056] By selecting one or more of the above materials, the anti-convective layer 30 can combine convection blocking, flexibility and damping, thereby achieving multiple effects of flow blocking, leveling and vibration reduction.

[0057] In some embodiments, the anti-convective layer 30 is constructed as a multi-layered structure.

[0058] Please see Figure 4 In one embodiment, the multi-layer structure includes upper and lower outermost layers, and a second upper layer 62 and a second lower layer 63 sandwiched in between; that is, from top to bottom, they can be upper outermost layer 61, second upper layer 62, second lower layer 63 and lower outermost layer 64.

[0059] The outermost layers (i.e., the upper outermost layer 61 and the lower outermost layer 64) can be made of aluminum foil or a composite of glass fiber and polypropylene; the next upper layer 62 can be made of flexible material or fiber woven fabric; and the next lower layer 63 can be made of aluminum foil anti-radiation and wear-resistant material.

[0060] The anti-convective layer 30 is composed of multiple layers, which can combine the advantages of various materials to achieve different functions in a layered and coordinated manner, while taking into account the effects of convection blocking, radiation heat reflection, flexible leveling, and wear-resistant protection.

[0061] It is important to note that Figure 4 The diagram shown is merely an exemplary multi-layer structure; the anti-convective layer 30 can also be a composite structure with two, three, five, or more layers, and the materials and thicknesses of each layer can be adjusted accordingly based on the usage environment. This invention does not limit the number of layers or the materials used in the anti-convective layer 30.

[0062] In this embodiment of the invention, the elastic modulus of the anti-convective layer 30 is A, where 1MPa≤A≤10MPa, and preferably, A=4MPa.

[0063] When the elastic modulus is too low, the anti-convective layer 30 is too soft, which may lead to deformation and is not conducive to stable leveling and maintaining the interface shape; when the elastic modulus is too high, the flexibility decreases, the containment of protrusions weakens, and the damping effect is reduced.

[0064] By controlling the elastic modulus within the range of 1 MPa to 10 MPa, the anti-convective layer 30 can maintain suitable elastic deformation capacity and damping buffer effect while possessing a certain structural strength. Preferably, when A=4 MPa, the fitting leveling and damping shock absorption effects can be better achieved.

[0065] In actual assembly, the main insulation layer 20 is usually assembled from multiple modular structures, with installation gaps 21 formed between adjacent modules. These installation gaps 21 may become channels for interlayer gas flow.

[0066] Please see Figure 5 In one embodiment, the main insulation layer 20 is composed of multiple main insulation modules, with an installation gap 21 between adjacent main insulation modules, and a portion of the anti-convection layer 30 extends and fills the installation gap 21.

[0067] Because the anti-convection layer 30 has a certain degree of flexibility, by extending a portion of the anti-convection layer 30 into the installation gap 21, the anti-convection layer 30 is not only located between the main insulation layer 20 and the secondary shielding layer 40, but can also extend upward or inward at the joint of the main insulation module, occupying part of the space in the installation gap 21. In this way, the convection channel along the installation gap 21 is blocked, interlayer convection is reduced, and the overall insulation continuity and insulation efficiency are improved.

[0068] Please see Figure 6 In another embodiment, the main insulation layer 20 is composed of multiple main insulation modules, and the edges of adjacent anti-convection layers 30 are overlapped to form a raised structure 34, which is located at the installation gap 21 between adjacent main insulation modules.

[0069] For example, a convection-prevention layer 30 is installed below each main insulation module. The edges of the convection-prevention layers 30 installed below adjacent main insulation modules overlap or overlap, and the thickened portion formed by the overlap or overlap forms a raised structure 34, which can partially fill the installation gap 21. In this way, a more continuous closed interface can be formed at the gap of the main insulation layer 20, improving the airtightness and flow resistance at the installation gap 21, reducing cold leakage, and thus improving the overall insulation effect of the storage tank.

[0070] It should be noted that the raised structure 34 can be formed by simply overlapping adjacent anti-convection layers 30, or by bonding, pressing or mechanical fixing, and the present invention does not limit this.

[0071] In some embodiments, the anti-convection layer 30 may also be sandwiched and filled between the main shielding layer 10 and the main insulation layer 20.

[0072] With this design, the anti-convective layer 30 can be placed on the upper and lower sides of the main insulation layer 20, serving as a dual function of flow suppression, buffering and vibration reduction, and leveling. On the one hand, it can further reduce the interlayer gas flow between the main shielding layer 10 and the main insulation layer 20, improving the overall thermal insulation capacity; on the other hand, it can provide a flexible transition and damping effect for local protrusions or uneven contact on one side of the main shielding layer 10.

[0073] In some embodiments, an independent anti-convection layer 30 may be provided between a pair of primary insulation layers 20 and secondary shielding layers 40; or, in other embodiments, the anti-convection layers 30 provided between multiple pairs of primary insulation layers 20 and secondary shielding layers 40 are formed into an integral structure.

[0074] An independent anti-convection layer 30 is set between the corresponding pair of main insulation layers 20 and secondary shielding layers 40. This method can ensure that an anti-convection layer 30 is set between each pair of main insulation layers 20 and secondary shielding layers 40, ensuring that each position between the layers can be protected by heat insulation and shock absorption.

[0075] An integrated anti-convection layer 30 is set between multiple pairs of main insulation layers 20 and secondary shielding layers 40, which ensures the continuity of flow obstruction and heat insulation, while simplifying the process.

[0076] When installing the anti-convective layer 30, either a separate installation method or a pre-connection method can be used.

[0077] In some implementations, the secondary shielding layer 40 and the secondary insulation layer 50 are laid first, then the anti-convection layer 30 is laid, and then the main insulation layer 20 and the main shielding layer 10 are installed; the separate installation method is conducive to flexibly adjusting the position of the anti-convection layer 30 according to the actual situation.

[0078] In other embodiments, during the factory prefabrication stage, the anti-convective layer 30 can be pre-connected and fixed to the bottom surface of the main insulation layer 20, for example by bonding or clamping, to form an integrated module; during on-site installation, the module can simply be laid on top of the secondary shielding layer 40; the integrated installation method improves the degree of prefabrication and modularity, and reduces the on-site laying process, thereby improving installation efficiency.

[0079] To adapt to different structural or thermal insulation requirements, the shape of the anti-convection layer 30 in this invention can be varied.

[0080] Please see Figure 7 In one embodiment, the anti-convective layer 30 is formed as multiple parallel strip structures, which fill the space between the main insulation layer 20 and the secondary shielding layer 40. By setting the strip structures, effective blocking can be formed in the direction of the main convection path, making it easier to bypass areas with complex local structures (such as areas with complex shapes of the first corrugated protrusion 41); at the same time, it reduces material consumption and improves layout flexibility.

[0081] Please see Figure 8 In another embodiment, the anti-convection layer 30 is formed into multiple block structures, which are respectively disposed at the outer peripheral edges between the main insulation layer 20 and the secondary shielding layer 40, such as the four corner positions shown in the figure. By setting the block structures, anti-convection treatment can be performed on key areas, such as the outer peripheral edges and corners; at the same time, material consumption is reduced and layout flexibility is improved.

[0082] It should be noted that the troposphere 30 can also take the form of sheet-like, grid-like, ring-like, or irregularly shaped blocks. This application does not limit the specific shape of the troposphere 30.

[0083] In summary, the present invention provides a cryogenic liquid cargo sealed storage tank, comprising a main shielding layer 10, a main insulation layer 20, an anti-convection layer 30, a secondary shielding layer 40, and a secondary insulation layer 50 stacked sequentially. At least a portion of the anti-convection layer 30 is sandwiched and filled between the main insulation layer 20 and the secondary shielding layer 40. The secondary shielding layer 40 has a first corrugated protrusion 41 protruding towards the main insulation layer 20, and the anti-convection layer 30 can avoid the first corrugated protrusion 41. By setting the anti-convection layer 30 between the main insulation layer 20 and the secondary shielding layer 40, and having at least a portion sandwiched and filled between the two layers, an additional flow-blocking interface can be formed in the original interlayer cavity. The anti-convection layer 30 forms an airflow blocking layer between the main insulation layer 20 and the secondary shielding layer 40, which can reduce interlayer convection, reduce heat transfer caused by convection, thereby reducing heat leakage and improving the storage and transportation efficiency of the cryogenic liquid cargo sealed storage tank. Furthermore, the secondary shielding layer 40 is not always perfectly flat, especially at the corrugated plate welding points where local protrusions are prone to form. The anti-convective layer 30 can absorb and transition these local unevennesses, leveling the protrusions of the secondary shielding layer 40 and improving the uniformity of contact between layers. Moreover, during ship operation, the liquid cargo sloshing can be mitigated by the anti-convective layer 30, reducing local impact and vibration transmission and improving the structural stability of the cryogenic liquid cargo sealed storage tank. By avoiding the first corrugated protrusion 41, the anti-convective layer 30 avoids problems such as stress concentration and unevenness between layers caused by interference and local compression, further enhancing the flow obstruction, leveling, and vibration reduction effects of the anti-convective layer 30.

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0086] Finally, it should be noted that the above description of the present invention and its embodiments is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cryogenic liquid cargo sealed storage tank, comprising: The main shielding layer, main insulation layer, secondary shielding layer and secondary insulation layer are stacked and installed in sequence, characterized in that it further includes: an anti-convection layer, at least a portion of which is sandwiched and filled between the main insulation layer and the secondary shielding layer. The secondary shielding layer is composed of multiple secondary corrugated plates spliced ​​together. At least a portion of the secondary corrugated plates are provided with a first corrugated recess facing the secondary insulation layer, and at least a portion of the secondary corrugated plates are provided with a first corrugated protrusion facing the main insulation layer. The first corrugated protrusion is a corrugated portion protruding towards the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate, and the first corrugated recess is a corrugated portion protruding away from the interior of the cryogenic liquid cargo sealed storage tank relative to the plane of the secondary corrugated plate. The anti-convective layer can avoid the first corrugated protrusion; the anti-convective layer is provided with a clearance hole, the clearance hole is directly opposite to the first corrugated protrusion, the first corrugated protrusion is adapted to pass through the clearance hole, and at least part of the secondary corrugated plate simultaneously has the first corrugated recess and the first corrugated protrusion.

2. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The thickness of the anti-convective layer is D, where 2mm ≤ D ≤ 10mm.

3. The cryogenic liquid cargo sealed storage tank according to claim 2, characterized in that, D=5mm.

4. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The anti-convective layer is made of one or more of the following materials: fiber, polypropylene, and aerogel.

5. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The tropospheric structure is a multi-layered structure.

6. The cryogenic liquid cargo sealed storage tank according to claim 5, characterized in that, The multi-layer structure includes upper and lower outermost layers, and a secondary upper layer and a secondary lower layer sandwiched in between. The upper and lower outermost layers are made of aluminum foil or a composite of glass fiber and polypropylene. The secondary upper layer is made of flexible material or fiber woven fabric. The secondary lower layer is made of aluminum foil anti-radiation and wear-resistant material.

7. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The elastic modulus of the anti-convective layer is A, where 1 MPa ≤ A ≤ 10 MPa.

8. The cryogenic liquid cargo sealed storage tank according to claim 7, characterized in that, The elastic modulus of the anti-convective layer is A, where A = 4 MPa.

9. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The main insulation layer is composed of multiple main insulation modules, and there are installation gaps between adjacent main insulation modules. A portion of the anti-convection layer extends and fills the installation gaps.

10. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The anti-convection layer is also sandwiched and filled between the main shielding layer and the main insulation layer.

11. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The main insulation layer is composed of multiple main insulation modules, and the edges of adjacent anti-convection layers are overlapped to form a raised structure. The raised structure is located in the installation gap between adjacent main insulation modules.

12. The cryogenic liquid cargo sealed storage tank according to claim 1, characterized in that, The anti-convection layer is formed as a strip structure, and multiple anti-convection layers are filled in parallel between the main insulation layer and the secondary shielding layer; or, the anti-convection layer is formed as a block structure and is respectively disposed at the outer peripheral edge between the main insulation layer and the secondary shielding layer.

Images