Patent Application
20230408030
This application claims the benefit of priority from Chinese Patent Application No. 202310780830.X, filed on Jun. 29, 2023. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.
The present disclosure relates to the field of liquefied gas storage tanks for marine engineering equipment, particularly marine equipment such as ships, and particularly to a corrugated plate for a liquefied gas storage tank of a transport device, particularly marine equipment such as a ship, and a storage container including the corrugated plate. The storage container particularly includes the liquefied gas storage tanks for marine equipment such as ships. Liquefied gases include, for example, liquefied natural gas, liquid nitrogen, liquid oxygen, liquid hydrogen, and liquid helium, etc.
Liquefied natural gas (LNG) constantly serves as first-choice energy to substitute for petroleum due to its advantages of greenness, environment friendliness, and high efficiency, and becomes one of the fastest growing energy industries in the world. With the rapid development of China's economy and the continuous improvement of environmental governance requirements, the application and development of LNG has attracted more and more attentions, and the demand of the society for clean energy has increased rapidly. LNG is one of the critical directions for the future development of clean energy in China.
Transportation of LNG typically relies on transport devices, e.g., marine equipment such as ships. The composition of an LNG receiving station mainly includes wharf unloading, LNG storage, process treatment, and external transportation. An LNG storage tank undertaking a storage task has the longest construction period, the most advanced technology, and the most difficulties in a project construction process, and is always managed as a critical path of the entire project. Moreover, the construction form and technological innovation of the LNG storage tank are also the focus of attention from Chinese and international professionals in the industry.
In the LNG storage tank, a corrugated plate used to constitute a sealing layer needs to be able to maintain good sealability and stability under various use conditions, and therefore the configuration and quality of the corrugated plate are particularly important. An existing corrugated plate requires improvements in terms of material uniformity, smoothness, and strength at corrugations, particularly at an intersection of transverse and longitudinal corrugations.
Therefore, there is a need to provide a corrugated plate and a storage container having the corrugated plate to at least partially solve the above problems.
A purpose of the present disclosure is to provide a corrugated plate. An overall shape of the corrugated plate of the present disclosure is smooth and stiff, with relatively sharp material deformations at particular positions, thereby not only ensuring an overall strength and stability of the corrugated plate, but also presenting better elasticity, contractility, and tension. The corrugated plate provided by the present disclosure may also maintain the performance of a raw material to a maximum extent.
The present disclosure further provides a storage container having the corrugated plate, e.g., a storage container used for storing LNG, wherein the corrugated plate may be used as a sealing layer of the storage container. In an implementation, the corrugated plate is cut into standard parts which are assembled as a sealing layer in the storage container. The sealing layer of the present disclosure has good flatness, causes little damage to a structure of a thermal insulation layer, and may reduce an impact of the sealing layer on a strength of a thermal insulation box. A structure of the sealing layer of the present disclosure is such that the sealing layer can be made thinner, so that an overall thermal conductivity of the storage container can be reduced to improve a heat preservation effect.
According to an aspect of the present disclosure, a corrugated plate for a liquefied gas storage tank of a transport device is provided. The corrugated plate includes a corrugated plate body, a longitudinal corrugation and a transverse corrugation that are formed on the corrugated plate body, and an intersection portion at an intersection of the longitudinal corrugation and the transverse corrugation, with a height of the longitudinal corrugation being less than a height of the transverse corrugation, and a maximum transverse dimension of the longitudinal corrugation being less than a maximum longitudinal dimension of the transverse corrugation, wherein the intersection portion includes a smooth central top surface and four drawbeads extending from the central top surface to the corrugated plate body, and the central top surface transitions to the drawbeads smoothly; wherein an overall extension direction of each of the drawbeads intersects a transverse direction, a longitudinal direction, and a height direction perpendicular to the corrugated plate body, and a height of the intersection portion is greater than the height of the longitudinal corrugation and the height of the transverse corrugation.
The central top surface and the four drawbeads at least partially constitute a body segment of the intersection portion, the intersection portion further includes two side segments that are located at two ends of the body segment in the transverse direction respectively, and a height of each of the side segments is less than the height of the transverse corrugation and a height of the body segment.
In an implementation, the side segment extends along the longitudinal direction and has a protrusion portion protruding from the transverse corrugation in the longitudinal direction.
In an implementation, a top of the side segment forms a trench extending along the longitudinal direction.
In an implementation, the intersection portion further includes a connection segment between the body segment and the side segment, and the connection segment presents a waist drum shape in the transverse direction.
In an implementation, each of the drawbeads has a ridge extending from a top to a bottom thereof, and a width of each ridge remains unchanged in a direction from the top to the bottom.
In an implementation, the intersection portion includes a connection segment between the body segment and the side segment, and a minimum longitudinal dimension of a top of the connection segment is equal to or close to the width of the ridge.
In an implementation, on a projection plane defined by the transverse direction and the height direction, top surfaces of the body segment and the connection segment present a rough straight line segment and are parallel to the corrugated plate body.
In an implementation, a trench parallel to the ridge and extending from the top to the bottom of the drawbead is provided between the ridge and the side segment.
In an implementation, the central top surface includes six boundary profiles, each of which is recessed towards a center of the central top surface, and all the boundary profiles have a same radius of curvature and/or a same length.
In an implementation, a longitudinal dimension of the central top surface is greater than a transverse dimension of the central top surface.
In an implementation, the intersection portion further includes a pair of side faces extending from the central top surface to the longitudinal corrugation, the pair of side faces have a same recessed shape and a same radius of curvature as the boundary profiles at respective top sides thereof, and a spacing between central positions on the pair of side faces in the height direction is greater than a spacing between bottom ends of the pair of side faces.
In an implementation, respective end projection profiles of the transverse corrugation and the longitudinal corrugation are formed into circular arc shapes.
In an implementation, the top of the side segment forms a four-pointed star shape from a look-down perspective.
In an implementation, in a top view of the corrugated plate, a body portion of each of the drawbeads extends along a direction that intersects both the longitudinal direction and the transverse direction, and a bottom segment of each of the drawbeads extends along the transverse direction.
In an implementation, a minimum transverse dimension of the top surface is more than twice a minimum longitudinal dimension of the top surface.
According to another aspect of the present disclosure, a storage container for a liquefied gas is provided, wherein a wall of the storage container includes a base layer and a sealing layer located on an inner side of the base layer, and the sealing layer includes the corrugated plate of any one of the implementations in the above solution.
In an implementation, the sealing layer includes:
In an implementation, at least two annular sections are provided and are arranged in an encircled manner in sequence, and the sealing layer further includes an annular section second connector disposed between the adjacent annular sections and fixing the adjacent annular sections on the base layer.
In an implementation, transverse corrugations and longitudinal corrugations of all the sealing plates of the annular section respectively constitute radial corrugations and circumferential corrugations of the annular section, radial inner ends of a part of the radial corrugations extend to the central section, radial inner ends of the other part of the radial corrugations are located in a middle portion of the annular section and away from the central section, a maximum circumferential distance between the circumferentially adjacent radial corrugations is within a predetermined range, and a sealing end cap is mounted at a radial inner end of each of the radial corrugations.
In an implementation, the wall is a rectangular wall, the sealing layer includes arrayed sealing plates arranged in an array, the arrayed sealing plates adjacent to each other along a first horizontal direction are connected and sealed by a first sealing connector, and the arrayed sealing plates adjacent to each other along a second horizontal direction are sealed and connected by a second sealing connector.
In an implementation, the base layer also includes base layer plates arranged in an array, with a gap being present between the adjacent base layer plates, each of the arrayed sealing plates has a corrugation extending in the same direction as each gap, and the corrugation covers the gap.
In an implementation, the storage container is a liquefied gas storage container for marine equipment or a land-based apparatus for a cryogenic frozen liquid.
The drawings of the present disclosure are used only as examples.
The present disclosure provides a corrugated plate for a liquefied gas storage tank of marine engineering equipment, particularly marine equipment such as a ship, and a liquefied gas storage container having the corrugated plate. The storage container is a liquefied gas storage container for the marine equipment or a land-based apparatus for a cryogenic frozen liquid.
It is to be noted first that, directional and positional terms as mentioned in the present disclosure are only illustrative descriptions rather than limiting descriptions. The description about a position of a component should be understood as a relative position rather than an absolute position, and the description about an extension direction of a component should be understood as a relative direction rather than an absolute direction. Directional and positional terms related to the corrugated plate may be understood with reference to positions, directions, etc. of various components shown in
Referring first to
In this implementation, the transverse corrugation 70 and the longitudinal corrugation 60 are both circular arc-shaped corrugations. For example, in projection planes shown in
In this implementation, a height of the intersection portion 80 is greater than the height of the transverse corrugation and the height of the longitudinal corrugation. The height of the intersection portion 80 refers to a distance between a top end of the intersection portion 80 and the corrugated plate body 50 in the height direction D3. The intersection portion 80 includes a smooth top surface 81 and four drawbeads 82 extending from the top surface 81 to the corrugated plate body 50 at a bottom side. The top surface 81 transitions to the drawbeads 82 smoothly, where an overall extension direction of each of the drawbeads 82 intersects the transverse direction D2, the longitudinal direction D1, and the height direction D3. It is to be noted that the “smooth top surface” means that the top surface 81 itself has no edges or corners.
As can be seen from
With continued reference to
In an implementation, as seen from an overall perspective, a longitudinal dimension of the top surface 81 is less than a transverse dimension thereof. In an implementation, a length of the profile boundary lines 813 is greater than a length of the profile boundary lines 814, so that a minimum transverse dimension W2 (see
The following proceeds to projections shown in
The top surface 81 transitions to the drawbeads 82 smoothly. An included angle between any position of the top surface 81 and a reference plane (the plane is parallel to the corrugated plate body 50) defined by the longitudinal direction D1 and the transverse direction D2 is less than an angle between the overall extension direction of the drawbead 82 and the reference plane. That is, referring to
With continued reference to
Furthermore, each drawbead 82 also has a top segment 821 connected with the top surface 81, and the drawbead 82 has a maximum thickness W roughly at the top segment 821 of the drawbead 82 (see
Compared to solutions of “the first side face extends both downward and along the longitudinal direction” and “the second side face extends both downward and along the transverse direction”, such design in this implementation leads to a sharp change in material forming, and the corrugated plate 500 presents stronger elasticity and contractility. Moreover, the intersection portion 80 has a stiffer and smoother shape, which may have better strength and stability. Further, turning back to
With reference to the above implementations, it can be seen that an overall shape of the corrugated plate of the present disclosure is smooth and stiff, with relatively sharp material deformations at particular positions, thereby not only ensuring an overall strength and stability of the corrugated plate, but also presenting better elasticity, contractility, and tension.
Further, a pair of transverse end faces 42 of the intersection portion 40 are recessed relative to each other; and a pair of longitudinal end faces 43 of the intersection portion are recessed relative to each other. On the projection plane defined by the transverse direction D2 and the height direction, a projection profile of a top of the intersection portion is composed of two straight line segments 411 intersecting at an obtuse angle. On the projection plane defined by the longitudinal direction D1 and the height direction, a projection profile of the intersection portion 40 is a dome shape 4121. The intersection portion 40 is provided with a dome-shaped protrusion portion 412 protruding from a body of the intersection portion 40 at an end of the intersection portion 40 located directly above the transverse corrugation 30.
Further, with reference to
A material diversion core needs to be mounted at a punch of the apparatus during molding of the corrugated plate to make material formation more controllable. The corrugated plate has a small deformation in the longitudinal direction D1, thereby maintaining the performance of a raw material to a maximum extent. Meanwhile, there is a sharp deformation in the transverse direction D2, which may make the corrugated plate have better elasticity and tensile strength.
The corrugated plate shown in
First referring to
The wall has a central section and an annular section. In an implementation, the sealing layer includes a central section 310 and at least one annular section 320 disposed around the central section 310. Each annular section 320 includes a plurality of annular section sealing plates 3210 which are obtained by cutting the corrugated plate. A gap 350 is provided between adjacent units in each annular section, and a first sealing connector may be disposed in the gap 350. For example, the first sealing connector is disposed between circumferentially adjacent sealing plates 3220 and fixes the two sealing plates on the base layer 400. The central section 310 is composed of a sectorial central sealing plate 3110. The base layer further has a base layer central section 420 and a base layer annular section 410 which is composed of a base layer unit plate 4110.
Further, at least two annular sections 320 are provided and are arranged in an encircled manner in sequence, and the sealing layer further includes an annular section second connector 340 disposed between the adjacent annular sections 320 and fixing the adjacent annular sections on the base layer 400. Three annular sections, i.e., a first annular section 420a, a second annular section 420b, and a third annular section 420c, are shown in the figure. In other implementations not shown, less or more annular sections may be provided.
Transverse corrugations and longitudinal corrugations of all the annular section sealing plates 3210 of the annular section respectively constitute radial corrugations and circumferential corrugations of the annular section 320. Radial inner ends of a part of the radial corrugations 380 extend to the central section 310, and radial inner ends of the other part of the radial corrugations 360 are located in a middle portion of the annular section 320 and away from the central section 310. Such configuration can avoid an excessively large circumferential length (e.g., S1 and S2 shown in the figure) between the adjacent radial corrugations at radially outer positions on the annular section, which results in insufficient stability and ductility of these positions. As such, adding another radial corrugation between such adjacent radial corrugations can ensure that a maximum circumferential distance between the circumferentially adjacent radial corrugations is within a predetermined range. For example, if a distance between the radial inner ends of a pair of adjacent radial corrugations of the part of the radial corrugations 380 is X, the maximum circumferential distance between the circumferentially adjacent radial corrugations in the annular section may be between 1.5X and 5X. In an implementation, a sealing end cap 370 is mounted at a radial inner end of each of the radial corrugations.
As can be seen from the above implementations, the sealing layers of the storage container of the present disclosure may be made of standard parts with regular shapes, without requiring special shaped segments, and the standard parts can be simply cut from rectangular plates, which is simple to process and saves materials. The sealing layers of the present disclosure have good flatness, little damage to structure of thermal insulation layers, and can reduce the influence of the sealing layers on the strength of a thermal insulation box. The structure of the sealing layers of the present disclosure is such that the sealing layers can be made thinner, so that an overall thermal conductivity of the storage container can be reduced to improve a heat preservation effect. Further, sealing connectors serving as universal parts may also be used between adjacent standard parts, and some sealing connectors of the present disclosure also have certain thermal expansion and contraction, which can provide a certain amount of cold shrinkage deformation for the sealing layers. In addition, the use of the sealing connectors of the present disclosure does not require additional processing operations such as edge rolling on the sealing layer unit plate, which can improve the flatness of the sealing layers and ensure the sealing effect. A bottom wall sealing layer has no raised portions, so that a thermal insulation layer laid on the sealing layer does not need to be slotted on the back, which improves a structural strength of the thermal insulation layer. The storage container of the present disclosure is a liquefied gas storage container for marine equipment or a land-based device for cryogenic frozen liquid.
The above-mentioned corrugated plates may also be replaced by another corrugated plate shown in
In this implementation, the transverse corrugation 30′ and the longitudinal corrugation 20′ are both circular arc-shaped corrugations. Projection profiles of the transverse corrugation 30′ and the longitudinal corrugation 20′ are formed into circular arc shapes, with respective top ends thereof being formed into circular arcs without edges or corners, and side faces thereof being walls with radians. In other implementations not shown, the transverse corrugation and/or the longitudinal corrugation may be formed into triangular corrugations. For example, in a respective cross-section (the cross-section is perpendicular to an extension direction of the corrugation) of the corrugation, a cross-sectional profile of the corrugation is formed into a rough triangle.
In this implementation, the intersection portion 40′ includes a body segment 41′, side segments 42′, and a connection segment 43′ located between the body segments 41′ and each of the side segments 42′. The body segment 41′ includes a smooth central top surface 411′ and four drawbeads 412′ extending from the central top surface 411′ to the corrugated plate body 10′, and the central top surface 411′ transitions to the drawbeads 412′ smoothly. An overall extension direction of each of the drawbeads 412′ intersects the transverse direction D2, the longitudinal direction D1, and the height direction D3. It is to be noted that the overall extension direction of the drawbead 412′ refers to a rough extension direction of the drawbead 412′ extending from the central top surface 411′ to the corrugated plate body 10′. A height of the central top surface 411′ is greater than a height of the transverse corrugation 30′.
Each of the drawbeads 412′ has a ridge 4121′ extending from a top to a bottom thereof and being formed into a part of the drawbead 412′. There is no obvious boundary between the drawbead 412′ and the connection segment 43′. However, since the ridge 4121′ abuts against the longitudinal corrugation 20′, it can be clearly seen that the ridge 4121′ is a part of the drawbead 412′, with a spacing being present between the ridge 4121′ and the connection segment 43′. A width of each ridge 4121′ remains unchanged in a direction from the top to the bottom. Each ridge extends downward from a top of the intersection portion 40′. The “width of the ridge” herein refers to a width of each ridge with branches being formed, and each ridge is roughly formed into a rib structure that abuts against the longitudinal corrugation 20′. It is to be noted additionally that the “width of the ridge” refers to a dimension W of the ridge 4121′ in a direction perpendicular to an extension direction thereof. The ridge 4121′ has a small width since it is roughly formed into the rib structure. The extension direction of the ridge 4121′ is roughly parallel to the extension direction of the drawbead 412′ where it is located. In an implementation, a trench 44′ parallel to the ridge 4121′ and extending from the top to the bottom of the drawbead 412′ is provided between the ridge 4121′ and the side segment 42′. An extension direction of the trench 44′ is represented by D4. In another implementation, a minimum longitudinal dimension W1 of a top of the connection segment 43′ is equal to or close to the width W of the ridge 4121′.
The two side segments 42′ are located at two ends of the body segment 41′ in the transverse direction respectively, and a height of the side segment 42′ is less than the height of the transverse corrugation 30′ and a height of the body segment 41′. The side segments 42′ separately extend along the longitudinal direction to protrude from the longitudinal corrugation 30′ in the longitudinal direction, so that the side segments 42′ have protrusion portions 422′ protruding from the transverse corrugation 30′. In an implementation, a top 421′ of the side segment 42′ forms a trench extending along the longitudinal direction D1. A longitudinal dimension at a middle position 431′ on the top of the connection segment 43′ in the transverse direction is less than longitudinal dimensions of a position 432′ where the top of the connection segment 43′ is connected with the side segment 42′ and of a position 433′ where the top of the connection segment 43′ is connected with the body segment 41′. That is, the top of the connection segment 43′ constitutes a waist drum shape, which is thinner in the middle position and expanded at junctions with the body segment 41′ and the side segment 42′.
On a projection plane defined by the transverse direction D2 and the height direction D3, top surfaces of the body segment 41′ and the connection segment 43′ present a roughly straight line segment 4101′ and are parallel to the corrugated plate body 10′. In an implementation, a length of the rough straight line segment 4101′ may be 2-3 times the maximum transverse dimension of the longitudinal corrugation 20′.
In an implementation, the intersection portion 40′ further includes a pair of side faces 45′ extending from the central top surface 411′ to the longitudinal corrugation 20′. The pair of side faces 45′ are closer to each other at central positions in the transverse direction than at two end positions in the transverse direction, so that a second boundary profile 4112′ and a fifth boundary profile 4115′ form arc lines which are recessed towards each other. The pair of side faces 45′ have a same recessed shape and a same radius of curvature as the boundary profiles (the second boundary profile 4112′ and the fifth boundary profile 4115′) at respective top sides thereof. Further, a spacing between central positions on the pair of side faces 45′ in the height direction is greater than a spacing between bottom ends of the pair of side faces 45′. The distance between the central positions on the pair of side faces 45′ in the height direction D3 is d2, and the distance between the bottom ends of the pair of side faces 45′ is d1, with d2>d1.
The central top surface of the intersection portion in this implementation also has some preferable configurations. The central top surface includes six boundary profiles each of which is connected between the adjacent drawbeads 412′ or between the drawbead 412′ and the connection segment adjacent to each other. For example, each of a first boundary profile 4111′, a third boundary profile 4113′, a fourth boundary profile 4114′, and a sixth boundary profile 4116′ is located between the drawbead 412′ and the connection segment adjacent to each other, and each of the second boundary profile 4112′ and the fifth boundary profile 4115′ is located between the adjacent drawbeads 412′. Each of the boundary profiles is recessed towards a center of the central top surface, and all the boundary profiles have a same radius of curvature and/or a same length. In an implementation, a longitudinal dimension of the top surface (e.g., a distance between the second boundary profile 4112′ and the fifth boundary profile 4115′) is greater than a transverse dimension of the top surface (e.g., a distance between an intersection of the first boundary profile 4111′ and the sixth boundary profile 4116′ and an intersection of the third boundary profile 4113′ and the fourth boundary profile 4114′). The top 421′ of the side segment 42′ forms a four-pointed star shape from a look-down perspective.
The corrugated plate in
The above corrugated plate has complex deformations at the intersection portion, but the various deformations are not sharp, thereby providing good tensile strength in a plurality of directions and achieving good strength and stability at the intersection portion. In addition, although the intersection portion has a plurality of deformations, a profile of each deformation is smooth, and an overall shape is stiff and smooth and easy to form.
Various variations and recombinations of the above implementations also fall within the scope of protection of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310780830.X | Jun 2023 | CN | national |
