Corrugated plate and shielding layer for low-temperature liquid cargo system and low-temperature liquid cargo system

Abstract

The invention discloses a corrugated plate for a low-temperature liquid cargo system, a shielding layer and the low-temperature liquid cargo system. The cryogenic liquid cargo system may be a storage tank or container for storing cryogenic liquid, such as liquefied natural gas. The corrugated plate comprises a corrugated plate plane layer and corrugations formed on the corrugated plate plane layer, the corrugations comprise first corrugations and second corrugations intersecting with the first corrugations, and each of the first corrugations and the second corrugations is provided with a protruding part, a concave part and a twisting part in the longitudinal extending direction of the first corrugations and the second corrugations. The convex part and the concave part are connected together through the torsion part in the longitudinal extending direction, the convex part protrudes towards the interior of the low-temperature liquid cargo system relative to the corrugated plate plane layer, and the concave part protrudes away from the interior of the low-temperature liquid cargo system relative to the corrugated plate plane layer. According to the scheme, the convex-concave matching structure is arranged in the longitudinal extension direction of the corrugations, so that the effect of blocking gas convection in the corrugated plate can be effectively achieved, evaporation of LNG in the storage tank can be effectively reduced, and then damage to goods is reduced.

Description

A corrugated plate and shielding layer for a cryogenic liquid cargo system, and the cryogenic liquid cargo system. Technical Field

[0001] This invention relates to the field of storage tank or container technology, and more specifically to a cryogenic liquid cargo system for holding or storing liquefied natural gas (LNG), as well as a corrugated plate for the cryogenic liquid cargo system and a shielding layer including the corrugated plate. Background Technology

[0002] Liquefied natural gas (LNG) storage tanks, used for holding and storing LNG, are found both on land and on ships. They typically operate at temperatures as low as -163°C. The sealing shielding layer in the tank, used to contact the LNG, is usually made of corrugated metal plates. These corrugations form circulation channels for the gas within the insulation layer. Due to the extremely low temperature of the shielding layer (around -163°C) and the relatively high temperature of the insulation layer or supporting structure (around 20°C), thermosiphon occurs in inclined walls at an angle to the horizontal, such as the vertical walls of the tank. The gas (or gas mixture) circulating near the tank interior is cooled and thus descends vertically between the sealing layer and the insulation layer (within the corrugated channels), while the gas circulating near the tank exterior is heated and thus rises vertically between the sealing layer and the insulation layer or between the insulation layer and the supporting wall. The cooled and heated gas circulations form a closed loop at the ends of the tank walls, transferring convective heat through the supporting walls of the tank. Continuous airflow convection circulation will exacerbate cooling loss, increase the evaporation rate of liquefied natural gas, and severely restrict the cooling efficiency and economy of storage tanks.

[0003] Therefore, there is a need to provide a corrugated plate, a shielding layer including the corrugated plate, and a cryogenic liquid cargo system including the shielding layer to block the formation of a continuous circulation channel in the insulation layer, thereby limiting natural convection. Summary of the Invention

[0004] To at least address the aforementioned problems, the present invention provides a corrugated plate for a cryogenic liquid cargo system. The corrugated plate includes a corrugated plate planar layer and corrugations formed on the planar layer. The planar layer includes a main body portion and an edge portion surrounding the main body portion. The edge portion is used to connect with the edge portion of another corrugated plate. The corrugations include a first corrugation and a second corrugation intersecting the first corrugation. Each of the first and second corrugations has, in its longitudinal extension direction, a protrusion protruding relative to the interior of the cryogenic liquid cargo system, a recessed portion retracting relative to the interior of the cryogenic liquid cargo system, and a torsion portion. The torsion portion connects the protrusion and the recessed portion together in the longitudinal extension direction. The protrusion protrudes towards the interior of the cryogenic liquid cargo system relative to the planar layer, and the recessed portion protrudes away from the interior of the cryogenic liquid cargo system relative to the planar layer.

[0005] In some embodiments, the main body portion and the edge portion are integrally formed.

[0006] In some embodiments, one of the recess and the protrusion is disposed on the main body portion, and the other of the recess and the protrusion is disposed on the edge portion.

[0007] In some embodiments, the recess is provided on the main body portion, and the protrusion is provided on the edge portion.

[0008] In some embodiments, the recessed portion and the protruding portion are provided at positions corresponding to the main body portion of the first corrugation and / or the second corrugation, and the recessed portion and / or the protruding portion are provided at positions corresponding to the edge portion of the first corrugation and / or the second corrugation.

[0009] In some embodiments, the corrugations are only provided on the main body portion, and the edge portion is constructed as a flat plate structure.

[0010] In some embodiments, the cross-sectional shape of the protrusion and the recess is any one of the following: semi-circular, semi-elliptical, U-shaped, triangular, square, polygonal, or irregular.

[0011] In some embodiments, the cross-sectional shape of the protrusion and / or the recess includes a protrusion that protrudes relative to the interior of the cryogenic cargo system and a recess that is recessed relative to the interior of the cryogenic cargo system, to form a wavy shape.

[0012] In some embodiments, the cross-sectional shapes of the protrusion and the recess correspond to each other in opposite directions.

[0013] In some embodiments, the protrusion and the recess are connected by a smoothly transitioning torsion portion having a curved surface with an outward convex structure and / or an inward concave structure.

[0014] In some embodiments, the edge portion is provided with a stepped portion formed by pressing, the stepped portion being used to abut and connect adjacent corrugated plates.

[0015] In some implementations, the number of lines in each of the first and second ripples ranges from 1 to 12.

[0016] In some embodiments, the length and width of the corrugated plate range from 0.3 meters to 3.6 meters.

[0017] In some implementations, the first corrugation and the second corrugation have different widths and heights.

[0018] The present invention also discloses a corrugated plate for a cryogenic liquid cargo system. The corrugated plate includes a corrugated plate planar layer and a first corrugation and a second corrugation formed on the corrugated plate planar layer. The first corrugation intersects with the second corrugation. At least one of the first corrugation and the second corrugation has a protrusion, a recess, and a torsion in its longitudinal extension direction. The torsion connects the protrusion and the recess together in the longitudinal extension direction. The protrusion protrudes toward the interior of the cryogenic liquid cargo system relative to the corrugated plate planar layer, and the recess protrudes toward the exterior of the cryogenic liquid cargo system relative to the corrugated plate planar layer. The torsion is located away from the intersection of the first corrugation and the second corrugation.

[0019] The present invention also discloses a shielding layer for a cryogenic liquid cargo system, the shielding layer comprising a plurality of corrugated plates as described in any of the above claims, the plurality of corrugated plates being sealed together.

[0020] In some embodiments, the corrugated plate includes a main body portion and an edge portion disposed around the main body portion, the protrusions being disposed on the edge portion, and the protrusions of adjacent corrugated plates being connected to each other.

[0021] In some embodiments, the corrugated plate includes a main body portion and an edge portion disposed around the main body portion, the recessed portion being disposed on the edge portion, and the recessed portions of adjacent corrugated plates being connected to each other.

[0022] In some embodiments, the corrugated plate includes a main body portion and an edge portion disposed around the main body portion, the corrugated portion being disposed on the main body portion, and the edge portion being configured as a flat plate structure, with the edge portions of adjacent corrugated plates connected to each other.

[0023] The present invention also discloses a shielding layer for a cryogenic liquid cargo system, the shielding layer comprising a corrugated plate with protrusions or recesses as described above on the edge portion, wherein the shielding layer further comprises an additional corrugated plate connected to the corrugated plate, the corrugations of the additional corrugated plate protruding only or recessing only relative to the planar layer of the additional corrugated plate, the corrugations of the additional corrugated plate having the same size and spacing as the corrugations of the corrugated plate, and the protruding or recessed portions abutting with the protruding or recessed portions of the corrugated plate.

[0024] The present invention also discloses a cryogenic liquid cargo system having a container wall, the container wall including a shielding layer as described in any of the preceding claims.

[0025] In some embodiments, the container wall includes, in its thickness direction, a second insulating layer, a second shielding layer, a first insulating layer, and a first shielding layer, wherein the first shielding layer is supported on the first insulating layer, and the second shielding layer is supported on the second insulating layer, and the first shielding layer is used to contact the contents of the cryogenic liquid cargo system.

[0026] In some embodiments, the first shielding layer and the second shielding layer have the same structure.

[0027] In some embodiments, the corrugations on the corrugated plates of the first and second shielding layers protrude in the same or opposite directions, such that the orientations of the first and second shielding layers are the same or opposite.

[0028] In some embodiments, the first shielding layer and the second shielding layer have different structures.

[0029] In some embodiments, the cryogenic liquid cargo system is a storage tank for storing cryogenic liquids.

[0030] According to the corrugated plate, shielding layer, and cryogenic liquefied cargo system of the present invention, by providing protrusions and recesses in the longitudinal extension direction of the corrugated portion of the corrugated plate, and connecting the protrusions and recesses through a torsion, the originally continuous circulation channel in the corrugated portion is blocked by the torsion structure at the "convex-concave" joint, thereby disrupting the conditions for stable convection of gas in the long continuous channel. This inhibits heat transfer, improves the thermal insulation performance of the cryogenic liquefied cargo system, effectively reduces the evaporation of LNG in the cryogenic liquefied cargo system, and thus reduces cargo loss and saves costs. Attached Figure Description

[0031] 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.

[0032] Figure 1 is a perspective view of a corrugated plate according to a first preferred embodiment of the present invention;

[0033] Figure 2 is a perspective view of a corrugated plate according to a second preferred embodiment of the present invention;

[0034] Figure 3 is an enlarged schematic diagram of a portion of the corrugated plate shown in Figure 1, showing the stepped portion of the edge of the corrugated plate;

[0035] Figure 4 is a perspective view of a shielding layer according to a first preferred embodiment of the present invention, wherein the two corrugated plates included in the shielding layer are the corrugated plates shown in Figure 1;

[0036] Figure 5 is a perspective view of a shielding layer according to a second preferred embodiment of the present invention, wherein the two corrugated plates included in the shielding layer are the corrugated plates shown in Figure 2;

[0037] Figure 6 is a perspective view of a shielding layer according to a third preferred embodiment of the present invention, wherein one of the corrugated plates included in the shielding layer is the corrugated plate shown in Figure 1;

[0038] Figure 7 is a perspective view of a portion of the container wall of a cryogenic liquid cargo system according to a first preferred embodiment of the present invention;

[0039] Figure 8 is a perspective view of a portion of the container wall of a cryogenic liquid cargo system according to a second preferred embodiment of the present invention. Detailed Implementation

[0040] 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.

[0041] This invention provides a corrugated plate, a shielding layer composed of multiple corrugated plates, and a cryogenic liquid cargo system having the shielding layer. The corrugated plate is preferably made of a metallic material (e.g., steel or aluminum alloy) and is suitable for manufacturing storage containers, particularly cryogenic liquid cargo systems for storing liquefied gases such as liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, liquid hydrogen, and liquid helium, which can be used in marine or land-based engineering equipment. The cryogenic liquid cargo system can be a storage tank for storing cryogenic liquids. Preferred embodiments of the corrugated plate, shielding layer, and cryogenic liquid cargo system according to the present invention will be described below with reference to Figures 1 to 8.

[0042] As shown in Figure 1, the corrugated plate 100 is processed from a flat metal plate, and its length and width can be between 0.3 meters and 3.6 meters. Those skilled in the art can process it according to actual needs. The corrugated plate 100 includes a generally rectangular corrugated plate planar layer 110 and corrugations formed on the corrugated plate planar layer 110. The corrugated plate planar layer 110 has a generally flat structure and is divided into two regions: a main body portion 111 and an edge portion 112. The edge portion 112 is disposed around the main body portion 111 and is mainly used for connecting with the edge portion 112 of another adjacent corrugated plate. For example, the edge portions 112 of two corrugated plates can be sealed together by welding. In a preferred embodiment, the main body portion 111 and the edge portion 112 are integrally formed, which ensures the overall strength and sealing performance of the corrugated plate 100.

[0043] The corrugations include a first corrugation 120 and a second corrugation 130. Both the first corrugation 120 and the second corrugation 130 are extended and intersect each other, forming an intersection portion 151 at the intersection. The intersection portion 151 has a specific knot structure, which can enhance the structural strength of the corrugated plate 100 at the intersection and help extend its service life. In the illustrated embodiment, the first corrugation 120 and the second corrugation 130 are orthogonal. It can be understood that in other embodiments not shown, the first corrugation 120 and the second corrugation 130 may also be obliquely intersecting. The number of first corrugations 120 and second corrugations 130 can be 1 to 12, depending on the overall size of the corrugated plate 100. For example, in the illustrated embodiment, the number of first corrugations 120 is 6 and the number of second corrugations 130 is 2. Of course, those skilled in the art can also set other numbers of first corrugations 120 and second corrugations 130 according to actual needs. The first corrugation 120 and the second corrugation 130 together form a grid-like corrugated structure on the corrugated plate 100, enabling the corrugated plate 100 to absorb thermal and mechanical stresses caused by temperature changes or internal pressure fluctuations in multiple directions.

[0044] Preferably, the first corrugation 120 and the second corrugation 130 have different widths and heights. Specifically, the width of the first corrugation 120 is greater than the width of the second corrugation 130, and the height of the first corrugation 120 is greater than the height of the second corrugation 130. The “width” of the corrugation mentioned here refers to the maximum horizontal dimension of the corrugation perpendicular to its longitudinal extension direction, and the “height” of the corrugation refers to the vertical distance between the highest point of the corrugation and the corrugated plate plane layer. The “longitudinal extension direction” is relative to each individual corrugation, that is, the length direction of a single corrugation, which is the extension direction of the corrugated channel. For example, as shown in Figure 1, the longitudinal extension direction of the first corrugation 120 is direction D1 in the figure, and the longitudinal extension direction of the second corrugation 130 is direction D2 in the figure. Referring to characteristics such as height and width, the first corrugation 120 can also be called a large corrugation, and the second corrugation 130 can also be called a small corrugation.

[0045] In one embodiment, each of the first corrugation 120 and the second corrugation 130 includes at least one protrusion 121 and at least one adjacent recess 122 in its longitudinal extension direction, rather than a single continuous protrusion or recess. Specifically, each of the first corrugation 120 and the second corrugation 130 further includes a torsion 140 located at the junction of the protrusion 121 and the recess 122, for connecting the protrusion 121 and the recess 122 together in their respective longitudinal extension directions. The protrusion 121 protrudes towards the interior of the cryogenic liquefied cargo system relative to the corrugated plate planar layer 110, and the recess 122 protrudes or recesses away from the interior of the cryogenic liquefied cargo system relative to the corrugated plate planar layer 110. It should be noted that both "protrusion" and "recess" refer to the interior of the cryogenic liquefied cargo system; "protrusion" means extending in a direction towards the interior of the cryogenic liquefied cargo system, and "recess" means extending in a direction towards the exterior of the cryogenic liquefied cargo system. This concave-convex design brings significant technical benefits. It breaks the limitation of the traditional corrugated plate having a single shape of corrugations along its entire length. By setting protrusions 121, recesses 122, and torsional parts 140 connecting the two in the longitudinal extension direction of the corrugations, the originally continuous channel is blocked by the "concave-convex" structure (i.e., the torsional part 140), thereby disrupting the conditions for stable convection of gas in a long continuous channel. This inhibits heat transfer, improves the thermal insulation performance of the cryogenic liquefied cargo system, effectively reduces LNG evaporation in the cryogenic liquefied cargo system, and reduces cargo loss.

[0046] In one embodiment, the torsion portion 140 is located away from the junction 151 of the first corrugation 120 and the second corrugation 130. "Remote" here means that the two components are not adjacent to each other. That is, the connection between the protrusion 121 and the recess 122 is spaced apart from and not adjacent to the junction 151 of the first corrugation 120 and the second corrugation 130. The junction 151 is typically a location with complex stress. By keeping the "transition connection" where the corrugation changes shape away from the junction 151, additional stress changes can be avoided in the stress concentration area, thereby further improving the overall fatigue life of the corrugated plate 100.

[0047] Preferably, the first corrugation 120 and the second corrugation 130 have the same concave-convex structure configuration; therefore, for the sake of brevity, only the first corrugation 120 will be described in detail below. However, it is understood that those skilled in the art can also configure the first corrugation 120 and the second corrugation 130 to have different concave-convex structure configurations as needed.

[0048] In a preferred embodiment, as shown in FIG1, the first corrugation 120 includes a central section 161 on the main body portion 111 and two edge sections 162 on the edge portions 112. The central section 161 forms a recessed portion 122 that is recessed relative to the corrugated plate planar layer 110, and the two edge sections 162 form protruding portions 121 that are protruding relative to the corrugated plate planar layer 110. That is, the first corrugation 120 forms a "convex-concave-convex" structural shape in its longitudinal extension direction D1. The protruding portions 121 and the recessed portions 122 smoothly transition and seal at the torsion portion 140 along the longitudinal extension direction D1 of the first corrugation 120, together forming a complete corrugated unit. In a preferred embodiment, the torsion portion 140 has a curved shape, which can effectively avoid stress concentration. As shown in FIG1, the connecting curved surface includes an inwardly recessed structure 142 with a large radius of curvature. In other embodiments, the connecting surface may also be constructed as a convex structure 241 (as shown in FIG2), or the connecting surface may include both convex and concave structures. For example, the area near the protrusion 121 may be a convex structure, and the area near the concave portion 122 may be a concave structure. Those skilled in the art can make the configuration according to actual needs.

[0049] The above solution sets the edge section 162 of the first corrugation 120 as a protrusion 121, so that when two corrugated plates 100 with the same structure are connected, the protruding edge section 162 of one corrugated plate 100 can overlap the same protruding edge section 162 of the other corrugated plate 100, which facilitates welding. Furthermore, by setting the middle section 161 of the first corrugation 120 as a recess 122, the recess 122 can be easily supported and carried by the insulation layer on the outside of the corrugated plate without the need to place additional reinforcing members on the outside of the corrugation, which improves the pressure bearing capacity and expands the loading capacity of the cryogenic liquid cargo system.

[0050] This invention provides a variety of flexible variations in the distribution of protrusions and recesses on a single corrugation to adapt to different connection requirements and stress conditions. These will be described in detail below.

[0051] In the corrugated plate 200 shown in Figure 2, the protrusion 221 of the first corrugation 220 is provided on the main body portion 211, while the recessed portion 222 connected to it is provided on the edge portions 212 at both ends. That is, the first corrugation 220 forms a "concave-convex-concave" structural shape in its longitudinal extension direction D1. The protrusion 221 and the recessed portion 222 smoothly transition and seal at the torsion portion 240 along the longitudinal extension direction D1 of the first corrugation 220, together forming a complete corrugated unit.

[0052] In another embodiment, the central section of the first corrugation (i.e., the section disposed on the main body) may also include a combination of protrusions and recesses, rather than just a single protrusion or recess; the edge section may include only protrusions or only recesses, or may include a recess on one side and a protrusion on the other side. The central section may include one protrusion and one recess, or it may include multiple protrusions and multiple recesses. For example, the corrugation pattern on the first corrugation may be convex (edge)-concave-convex-concave-convex (edge), or convex (edge)-convex-concave-convex (edge), or concave (edge)-concave-convex-concave (edge), or convex (edge)-concave-convex-concave (edge), etc., which can be configured according to actual needs by those skilled in the art.

[0053] In another embodiment, the entire corrugated portion, including the first and second corrugations, is only disposed on the main body, while the edge portions are constructed as flat plates without any corrugations. This design simplifies the shape of the edge portions, allowing the edge portions of the two corrugated plates to be overlapped or butt-welded in a plane-to-plane manner. Each of the first and second corrugations may include a protrusion and a recess, or may include multiple protrusions and multiple recesses.

[0054] The cross-sections of the protrusion 121 and the recess 122 taken along the longitudinal extension direction perpendicular to the corrugation can be of various shapes. In some embodiments, both the protrusion 121 and the recess 122 may have a semi-circular cross-section. For example, referring to FIG1, the cross-sections of the protrusion 121 and the recess 122 are formed as semi-circles, with their respective apexes formed as arcs without sharp corners. This shape provides a smooth transition and minimizes stress concentration. Of course, it is understood that in other embodiments, the cross-sections of the protrusion 121 and the recess 122 may also be formed as semi-elliptical, U-shaped, triangular, square, polygonal, or irregular shapes. In one embodiment, the cross-sectional shape of the protrusion 121 and / or the recess 122 may include a protrusion that protrudes from the interior of the cryogenic liquid cargo system and a recess that is recessed from the interior of the cryogenic liquid cargo system, for example, it may include two recesses and one protrusion to form a corrugated shape.

[0055] To facilitate welding between two adjacent corrugated plates 100, preferably, as shown in FIG3, a stepped portion 150 formed by upward or downward pressing is provided on the edge portion 112 of the corrugated plate 100 (including the corrugated edge section 162 with protrusions 121 or recesses 122). This stepped portion 150 facilitates the overlapping of the edge portions 112 of two adjacent corrugated plates 100 at the stepped portion 150, thereby ensuring that the welding heat source can be evenly applied to the two overlapping plates, thus forming a dense and reliable weld. More preferably, the height of the stepped portion 150 is equivalent to the thickness of the corrugated plate 100, so that the joint of the two corrugated plates 100 has a smooth surface after the overlap is completed.

[0056] The present invention also provides a shielding layer for cryogenic liquid cargo systems, which is composed of multiple corrugated plates sealed and spliced ​​together.

[0057] In a preferred embodiment, the shielding layer 170 is formed by sealing and splicing together a plurality of corrugated plates 100 as described in any of the preceding embodiments. Preferably, the plurality of corrugated plates 100 have the same structure and are oriented in the same way when spliced ​​together.

[0058] As shown in Figure 4, in one embodiment, the recessed portions 122 of the corrugations of each corrugated plate in the shielding layer 170 are provided on the main body portion 111, and the protrusions 121 are provided on the edge portion 112. The protrusions 121 of two adjacent corrugated plates 100 can overlap or butt-joint with each other and be sealed together by weld.

[0059] As shown in Figure 5, in one embodiment, the protruding portions 221 of the corrugations of each corrugated plate in the shielding layer 270 are provided on the main body portion 211, and the recessed portions 222 are provided on the edge portion 212. The recessed portions 222 of two adjacent corrugated plates can overlap or butt-joint with each other and be sealed together by weld.

[0060] In another embodiment not shown, the protruding and recessed portions of the corrugations can both be provided on the main body, and the edge portion is a flat plate structure, in which case the flat plate edges of adjacent corrugated plates are directly connected by butt welds or lap welds.

[0061] In another preferred embodiment, the shielding layer may be formed by sealing and splicing a corrugated plate 100 with a recessed portion 122 or a protrusion 121 as shown in FIG. 1 or FIG. 2 on the edge portion 112 and a prior art additional corrugated plate 100'. The additional corrugated plate 100' may adopt a corrugated plate structure commonly used in the prior art, which may include, for example, an additional corrugated plate planar layer 110' and one or more additional corrugations 120' formed on the additional corrugated plate planar layer 110', the additional corrugations 120' also including two intersecting corrugations, each corrugation extending from one end of the additional corrugated plate planar layer 110' to the other end. The additional corrugations 120' are only protruding or only recessed relative to the additional corrugated plate planar layer 110', that is, each of the intersecting corrugations formed on the additional corrugated plate 100' is a single continuous protrusion or a single continuous recess in its longitudinal extension direction. Furthermore, the additional corrugations 120' are comparable in size and spacing to the corrugations of the corrugated plate 100. When the corrugated plate 100 and the additional corrugated plate 100' are joined together, the protruding or recessed portions of the additional corrugations 120' align and engage with the protruding portions 121 or recessed portions 122 of the corrugated plate 100. For example, the shielding layer 370 shown in FIG6 includes a corrugated plate 100 and an additional corrugated plate 100' with protruding portions 121 provided on the edge portion 112 as shown in FIG1. ​​The additional corrugations 120' of the additional corrugated plate 100' protrude relative to the planar layer 110' of the additional corrugated plate. During splicing, the protruding additional corrugations 120' engage with the protruding portions 121 of the corrugated plate 100 located on the edge portion 112. In other embodiments not shown, the additional corrugations of the additional corrugated plate may also be recessed relative to the planar layer of the additional corrugated plate. In this case, the additional corrugated plate may be connected to the corrugated plate 200 with the recessed portion 222 provided on the edge portion 212 as shown in FIG2.

[0062] The shielding layer 370 formed by this splicing method splices together a corrugated plate with a concave-convex mating structure formed according to the design scheme of the present invention and a corrugated plate of the prior art. Therefore, even if the corrugated plate of the prior art has continuous channels, the shielding layer 370 can still bring about the significant technical effect mentioned above, because the concave-convex mating structure in the corrugated plate of the present invention can block the continuous channels in the existing corrugated plate, thereby disrupting the conditions for gas to form stable convection in long continuous channels.

[0063] The present invention also provides a cryogenic liquid cargo system, which can be a storage tank for storing cryogenic liquids. The cryogenic liquid cargo system has a container wall. Figure 7 shows a portion of the container wall of a cryogenic liquid cargo system according to a preferred embodiment of the present invention. For simplicity, only a partial view of the structure of each layer of the container wall is shown. As shown in Figure 7, the container wall 180, from the outside to the inside, includes: a second insulating layer 184, a second shielding layer 183, a first insulating layer 182, and a first shielding layer 181. That is, the first shielding layer 181 is located at the innermost side of the container wall and is in contact with the contents (e.g., LNG) in the cryogenic liquid cargo system, while the second insulating layer 184 is located at the outermost side. Both the first insulating layer 182 and the second insulating layer 184 are composed of insulating boards (e.g., plywood) made of heat-insulating material, and both the first shielding layer 181 and the second shielding layer 183 can adopt the shielding layer structure mentioned above. The second shielding layer 183 serves as a secondary sealing membrane supported on the second insulating layer 184, and the first shielding layer 181 serves as a primary sealing membrane supported on the first insulating layer 182.

[0064] In a preferred embodiment, the first shielding layer 181 and the second shielding layer 183 have the same structure and the same orientation. The term "same structure" here means that the structures of the first shielding layer 181 and the second shielding layer 183 are completely identical, including the structure of the corrugated plate 100 used and the connection method between the corrugated plates 100 (convex-convex fit or concave-concave fit, etc.). As shown in FIG. 7, both the first shielding layer 181 and the second shielding layer 183 adopt the corrugated plate structure shown in FIG. 1, that is, the recessed portion 122 is provided on the main body portion 111 of the corrugated plate 100, and the protruding portion 121 is provided on the edge portion 112 of the corrugated plate 100. Furthermore, the orientation of the corrugated plates 100 in the first shielding layer 181 and the second shielding layer 183 is also the same, that is, the protruding direction of the corrugations on the corrugated plates of the first shielding layer 181 and the second shielding layer 183 is the same. In other embodiments not shown, the first shielding layer 181 and the second shielding layer 183 may both adopt the corrugated plate structure shown in FIG2, that is, the protrusion 221 is provided on the main body portion 211 of the corrugated plate 200, and the recess 222 is provided on the edge portion 212 of the corrugated plate 200.

[0065] In another preferred embodiment, the first shielding layer 181 and the second shielding layer 183 may have the same structure but with opposite orientations. For example, the first shielding layer 181 may adopt the corrugated plate structure shown in FIG. 1, that is, the recessed portion 122 is provided in the main body portion 111 of the corrugated plate 100, and the protruding portion 121 is provided in the edge portion 112 of the corrugated plate 100. The second shielding layer 183 may also adopt the corrugated plate structure shown in FIG. 1, but with an orientation opposite to that of the first shielding layer 181, that is, the protruding portion 121 is provided in the main body portion 111 of the corrugated plate 100, and the recessed portion 122 is provided in the edge portion 112 of the corrugated plate 100. Alternatively, the first shielding layer 181 can adopt the corrugated plate structure shown in FIG2, that is, the recessed portion 222 is provided in the main body portion 211 of the corrugated plate 200, and the protruding portion 221 is provided in the edge portion 212 of the corrugated plate 200. The second shielding layer 183 can also adopt the corrugated plate structure shown in FIG2, but is arranged in the opposite orientation to the first shielding layer 181, that is, the protruding portion 221 is provided in the main body portion 211 of the corrugated plate 200, and the recessed portion 222 is provided in the edge portion 212 of the corrugated plate 200.

[0066] Figure 8 shows a portion of the container wall of a cryogenic liquid cargo system according to another preferred embodiment of the present invention. Similar to the container wall described above, the container wall 280 shown in Figure 8 also includes, from the outside to the inside: a second insulating layer 284, a second shielding layer 283, a first insulating layer 282, and a first shielding layer 281. For simplicity, only a portion of the structure of each layer is shown. In this embodiment, the first shielding layer 281 and the second shielding layer 283 can adopt different structures. For example, the first shielding layer 281 adopts the shielding layer structure shown in Figure 6, that is, the first shielding layer 281 can be formed by splicing together a corrugated plate 100 improved according to the present invention and an additional corrugated plate 100' of the prior art. The second shielding layer 283 adopts the shielding layer structure shown in Figure 4, that is, the second shielding layer 283 is formed by splicing together multiple corrugated plates 100 improved according to the present invention. Those skilled in the art can make configurations according to actual needs.

[0067] 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 corrugated plate for a cryogenic liquid cargo system, characterized in that, The corrugated plate includes a corrugated plate planar layer and corrugations formed on the corrugated plate planar layer. The corrugated plate planar layer includes a main body portion and an edge portion disposed around the main body portion. The edge portion is used to connect with the edge portion of another corrugated plate. The corrugations include a first corrugation and a second corrugation intersecting the first corrugation. Each of the first corrugation and the second corrugation has a protrusion protruding relative to the interior of the cryogenic liquefied cargo system, a recessed portion retracting relative to the interior of the cryogenic liquefied cargo system, and a torsion portion in its longitudinal extension direction. The torsion portion connects the protrusion and the recessed portion together in the longitudinal extension direction. The protrusion protrudes towards the interior of the cryogenic liquefied cargo system relative to the corrugated plate planar layer, and the recessed portion protrudes away from the interior of the cryogenic liquefied cargo system relative to the corrugated plate planar layer.

2. The corrugated plate according to claim 1, characterized in that, The main body and the edge portion are integrally formed.

3. The corrugated plate according to claim 1, characterized in that, One of the recessed portion and the protruding portion is provided on the main body portion, and the other of the recessed portion and the protruding portion is provided on the edge portion.

4. The corrugated plate according to claim 1 or 3, characterized in that, The recessed portion is provided on the main body portion, and the protruding portion is provided on the edge portion.

5. The corrugated plate according to claim 1, characterized in that, The first corrugation and / or the second corrugation are provided with the recessed portion and the protruding portion at the position corresponding to the main body portion, and the first corrugation and / or the second corrugation are provided with the recessed portion and / or the protruding portion at the position corresponding to the edge portion.

6. The corrugated plate according to claim 1, characterized in that, The ripples are only provided on the main body, and the edge portion is constructed as a flat plate structure.

7. The corrugated plate according to claim 1, characterized in that, The cross-sectional shape of the protrusion and the recess is any one of the following: semi-circular, semi-elliptical, U-shaped, triangular, square, polygonal or irregular shape.

8. The corrugated plate according to claim 7, characterized in that, The cross-sectional shape of the protrusion and / or the recess includes a protrusion that protrudes from the interior of the cryogenic liquid cargo system and a recess that is recessed from the interior of the cryogenic liquid cargo system, forming a wavy shape.

9. The corrugated plate according to claim 1 or 7, characterized in that, The cross-sectional shapes of the protrusion and the recess correspond to each other in opposite directions.

10. The corrugated plate according to claim 1, characterized in that, The protruding portion and the recessed portion are connected by a smoothly transitioning torsion portion, the torsion portion having a curved surface, the curved surface having an outward convex structure and / or an inward concave structure.

11. The corrugated plate according to claim 1, characterized in that, The edge portion is provided with a stepped portion formed by pressing, which is used to connect adjacent corrugated plates.

12. The corrugated plate according to claim 1, characterized in that, The number of each of the first and second corrugations ranges from 1 to 12, and / or the length and width of the corrugated plate range from 0.3 meters to 3.6 meters.

13. The corrugated plate according to claim 1, characterized in that, The first ripple and the second ripple have different widths and heights.

14. A corrugated plate for a cryogenic liquid cargo system, characterized in that, The corrugated plate includes a corrugated plate planar layer and a first corrugation and a second corrugation formed on the corrugated plate planar layer. The first corrugation intersects with the second corrugation. At least one of the first corrugation and the second corrugation has a protrusion, a recess, and a torsion in its longitudinal extension direction. The torsion connects the protrusion and the recess together in the longitudinal extension direction. The protrusion protrudes toward the interior of the cryogenic liquid cargo system relative to the corrugated plate planar layer, and the recess protrudes toward the exterior of the cryogenic liquid cargo system relative to the corrugated plate planar layer. The torsion is located away from the intersection of the first corrugation and the second corrugation.

15. A shielding layer for a cryogenic liquid cargo system, characterized in that, The shielding layer comprises a plurality of corrugated plates as described in any one of claims 1-14, wherein the plurality of corrugated plates are sealed together.

16. The shielding layer according to claim 15, characterized in that, The corrugated plate includes a main body portion and an edge portion surrounding the main body portion, the protrusions being disposed on the edge portion, and the protrusions of adjacent corrugated plates being connected to each other.

17. The shielding layer according to claim 15, characterized in that, The corrugated plate includes a main body portion and an edge portion surrounding the main body portion, the recessed portion being disposed on the edge portion, and the recessed portions of adjacent corrugated plates being connected to each other.

18. The shielding layer according to claim 15, characterized in that, The corrugated plate includes a main body and an edge portion surrounding the main body. The corrugations are disposed on the main body, and the edge portion is constructed as a flat plate structure. The edge portions of adjacent corrugated plates are connected to each other.

19. A shielding layer for a cryogenic liquid cargo system, characterized in that, The shielding layer includes the corrugated plate as described in claim 3, wherein the shielding layer further includes an additional corrugated plate connected to the corrugated plate, the corrugations of the additional corrugated plate protruding only or recessed only relative to the planar layer of the additional corrugated plate, the corrugations of the additional corrugated plate being equivalent in size and spacing to the corrugations of the corrugated plate, and the protruding or recessed portions abutting with the protruding or recessed portions of the corrugated plate.

20. A cryogenic liquid cargo system, characterized in that, The cryogenic liquid cargo system has a container wall, the container wall including a shielding layer as described in any one of claims 15-19.

21. The cryogenic liquid cargo system according to claim 20, characterized in that, The container wall comprises, in its thickness direction, a second insulating layer, a second shielding layer, a first insulating layer, and a first shielding layer, wherein the first shielding layer is supported on the first insulating layer, and the second shielding layer is supported on the second insulating layer, and the first shielding layer is used to contact the contents of the cryogenic liquid cargo system.

22. The cryogenic liquid cargo system according to claim 21, characterized in that, The first shielding layer and the second shielding layer have the same structure.

23. The cryogenic liquid cargo system according to claim 22, characterized in that, The corrugations on the corrugated plates of the first and second shielding layers are protruding in the same or opposite directions, so that the orientations of the first and second shielding layers are the same or opposite.

24. The cryogenic liquid cargo system according to claim 21, characterized in that, The first shielding layer and the second shielding layer have different structures.

25. The cryogenic liquid cargo system according to claim 20, characterized in that, The cryogenic liquid cargo system is a storage tank used to store cryogenic liquids.

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