A low temperature storage tank and its dihedral angle area installation structure and installation method

Abstract

The present invention discloses a low-temperature storage tank and an installation structure and an installation method for a dihedral area thereof, which relate to the technical field of liquefied gas storage containers, and include an integrated installation assembly; the integrated installation assembly is in the shape of a dihedral angle, and includes an upper metal plate and a lower metal plate on either side of the dihedral angle, and the upper metal plate and the lower metal plate are integrally connected through a support portion; a rib plate is also integrally connected to the inner side of the lower metal plate; the connection line between the rib plate and the lower metal plate passes through both sides of the dihedral angle and intersects with the intersection line of the dihedral angle; the upper metal plate is welded to the main metal film plate of the bottom / wall of the storage tank; the lower metal plate is welded to the secondary metal film plate of the bottom / wall of the storage tank. By integrally connecting the upper and lower metal plates, and providing a rib plate with a height close to the main layer at the angle, the rib plate shares most of the stress in the angle area, and protects the angle area of ​​the upper metal plate.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied gas storage containers, and in particular to a low-temperature storage tank and an installation structure and an installation method for a dihedral area thereof. Background Art

[0002] The wall of the cryogenic film storage container is a multi-layer structure, including an insulating layer, a shielding layer, etc. At present, for each layer of the fixing structure, it is necessary not only to provide axial tension, but also to provide a large lateral force. The above-mentioned stud fixing form is relatively easy to cope with the axial tension caused by cold shrinkage, but it is often difficult to cope with large lateral stress, and the screw used to fix the insulating layer is easy to break. Especially for liquefied gas tankers, the external environment they face is more complex and unstable than that of land-based storage tanks, and the requirements for mechanical properties are higher. Therefore, in the specific design of the primary and secondary layers, the thickness of the primary layer is reduced as much as possible, and the thickness of the secondary layer is increased.

[0003] The invention patent application with publication number CN118623202A discloses a mounting structure for the corner area of ​​a cryogenic storage tank. However, it has been found through testing that at low temperatures below -163°C, the corner area of ​​the upper metal plate of the structure is subjected to greater stress and is prone to fatigue.

[0004] Therefore, it is necessary to provide a solution to fix the layers in the corner area of ​​the film storage container and improve the structural strength of the layers in the corner area of ​​the film storage container, especially the corner area of ​​the main shielding layer. Summary of the invention

[0005] The purpose of the present invention is to fix the layers in the folded corner area of ​​the film storage container and to improve the structural strength of the dihedral angle area of ​​the main shielding layer.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an installation structure for the dihedral angle area of ​​a low-temperature storage tank, wherein the installation structure includes an integrated installation component; the integrated installation component is in the shape of a folded angle of the dihedral angle, and includes an upper metal plate and a lower metal plate on either side of the dihedral angle, and the upper metal plate and the lower metal plate on each side are integrally connected through a support portion; a rib plate is also integrally connected to the inner side of the lower metal plate; the connection line between the rib plate and the lower metal plate passes through both sides of the dihedral angle and intersects with the intersection line of the dihedral angle; the edge of the rib plate away from the lower metal plate is spaced 0.2~5mm from the upper metal plate; the upper metal plate is welded to the main metal film plate on the bottom / wall of the storage tank to form a main shielding layer; the lower metal plate is welded to the secondary metal film plate on the bottom / wall of the storage tank to form a secondary shielding layer.

[0007] Preferably, the height of the support portion is within 50 mm.

[0008] Preferably, the plane where the rib plate is located is perpendicular to the intersection line of the dihedral angles.

[0009] Preferably, the rib plate is directly connected to the support portion and connected as one piece, or is only indirectly connected via a lower metal plate.

[0010] Preferably, the rib plate and the center plane of the support portion in the thickness direction are in the same plane or parallel to each other.

[0011] Preferably, other areas between the upper metal plate and the lower metal plate are filled with a first insulating layer; the first insulating layer is made of a soft heat-insulating material.

[0012] Preferably, the area of ​​the lower metal plate is larger than that of the upper metal plate, and the edge of the lower metal plate is outside the upper metal plate.

[0013] Preferably, the thickness of the upper metal plate, the lower metal plate, the rib plate and the support portion are all 5-15 mm.

[0014] Preferably, any side of the dihedral angle of each of the integrated mounting components comprises at least two of the supporting portions and two of the ribs.

[0015] The present invention also discloses a method for installing the installation structure of the dihedral angle region of the low-temperature storage tank, comprising the following steps:

[0016] S1, manufacturing the integrated mounting assembly by welding or integral molding; the inner side of the lower metal plate of the integrated mounting assembly is also integrally connected with a rib plate;

[0017] S2, fixing and connecting the lower metal plate to a second insulating layer outside the lower metal plate;

[0018] S3, the lower metal plate is welded to the secondary metal film plate on the bottom / wall of the storage tank to form a secondary shielding layer;

[0019] S4, laying plywood on the secondary metal film plate;

[0020] S5, welding the upper metal plate to the main metal film plate on the bottom / wall of the storage tank to form a main shielding layer.

[0021] The invention also discloses a storage tank using the above-mentioned angled area mounting structure, and the storage tank can be used for storage or transportation of liquefied gas on a liquefied gas transport ship or on land.

[0022] The beneficial effects of the present invention include:

[0023] By integrally connecting the upper metal plate and the lower metal plate and providing a rib plate at the corner whose height is close to that of the main shielding layer and the secondary shielding layer, the rib plate can share most of the stress in the corner area, thereby protecting the corner area of ​​the upper metal plate.

[0024] By integrally connecting the upper metal plate with the lower metal plate, the integrated installation assembly used in the present invention helps to reduce on-site installation time, reduces welding workload, and the secondary shielding layer, main insulation layer, and main shielding layer in the corner area can be installed in just one time.

[0025] The upper metal plate and the lower metal plate form a step shape, which is convenient for layered welding to form two independent closed spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of an embodiment of the installation structure of the dihedral angle region of a low-temperature storage tank of the present invention;

[0027] Figure 2 It is a schematic diagram of another embodiment of the installation structure of the dihedral angle area of ​​the low-temperature storage tank of the present invention;

[0028] Figure 3 It is a schematic diagram of the positional relationship between the installation structure of the dihedral angle area of ​​the low-temperature storage tank of the present invention and other areas of the bottom surface / wall surface of the storage tank;

[0029] Figure 4 for Figure 1 , Figure 2 AA section diagram;

[0030] Figure 5 for Figure 1 , Figure 2 BB cross-section diagram.

[0031] Figure numerals: 1 - upper metal plate; 2 - lower metal plate; 3 - support part; 4 - rib plate; 5 - main metal film plate; 6 - plywood; 7 - secondary metal film plate; 8 - second insulating layer; 9 - first insulating layer. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that the thickness direction of the upper metal plate 1 and the lower metal plate 2 is different from the thickness direction of the support portion 3 and the rib plate 4. The thickness direction of the support portion 3 and the rib plate 4 is Figure 1~Figure 3 It is not shown in Figure 4 , Figure 5 It is shown in Figure 4 , Figure 5 left and right direction.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes, and do not refer to the limitation of time sequence, quantity, or importance. They cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, but are only for distinguishing one technical feature from another technical feature in the technical solution. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically specified. Similarly, the qualifiers similar to "one" appearing in this article do not refer to the limitation of quantity, but describe technical features that have not appeared in the previous text. Similarly, unless it is a noun modified by a specific quantitative quantifier, it should be regarded as including both singular and plural forms in this article, and the technical solution can include both singular and plural technical features. Similarly, modifiers similar to "approximately" and "approximately" appearing before the numerals in this article usually include the number itself, and their specific meanings should be understood in conjunction with the context.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The term "integrated connection" includes welding or integral molding connection methods.

[0036] Unless clearly indicated to the contrary, each aspect or embodiment defined herein may be combined with any other aspect or embodiments. In particular, any feature indicated as preferred or advantageous may be combined with any other feature indicated as preferred or advantageous.

[0037] The present invention discloses a mounting structure for a low-temperature storage tank dihedral area, such as Figures 1 to 5 As shown, the mounting structure includes an integrated mounting assembly. The integrated mounting assembly forms the main shielding layer, the main insulating layer, and the secondary shielding layer in the angled area of ​​the membrane storage tank. Therefore, the integrated mounting assembly is angled, and includes an upper metal plate 1 and a lower metal plate 2 on either side of the angle, and the upper metal plate 1 and the lower metal plate 2 on each side are integrally connected through a support portion 3, and the upper metal plate 1, the support portion 3, and the lower metal plate 2 are made of the same material. Due to the low temperature environment, each component in the tank will shrink, and due to the different shrinkage coefficients of each component, the stress situation in the tank will become complicated. The integrated connection of the upper metal plate 1 and the lower metal plate 2 is beneficial to improving the strength of the membrane structure and the ability of the membrane storage tank to resist low-temperature deformation.

[0038] In some embodiments, a first insulating layer 9 is filled between the upper metal plate 1 and the lower metal plate 2. The first insulating layer 9 is made of soft heat-insulating materials such as glass wool or polyurethane, which is different from laying plywood 6 between the main metal film plate 5 and the secondary metal film plate 7. Because the main metal film plate 5 and the secondary metal film plate 7 generally use corrugated plates or strip alloy steel with a thickness of (1~2) mm, plywood 6 is required under the main metal film plate 5 to provide sufficient support strength to support the upper metal plate 1, and the insulation effect of wooden plywood is better. The upper metal plate 1 and the lower metal plate 2 in the dihedral angle area generally use 5~15mm thick steel plates to better cope with the stress formed when the dihedral angle area shrinks. The thick steel plate itself has sufficient support strength, so polyurethane or glass wool with better thermal insulation performance can be selected; on the other hand, not laying hard plywood is also conducive to reserving a certain space for the thick steel plate in the dihedral angle area to deform, preventing excessive stress in the dihedral angle area from causing damage to the tank.

[0039] In some embodiments, the thickness of the first insulating layer 9 and the height of the support portion 3 are both within 50 mm. In this case, the distance between the upper metal plate 1 and the lower metal plate 2 is relatively close, which can reduce the stress on the upper metal plate 1, the support portion 3, and the lower metal plate 2 on the one hand, and on the other hand, since the upper metal plate 1 and the lower metal plate 2 are integrally connected through the support portion 3, the cold will be transferred from the support portion 3 to the lower metal plate 2, and the cold-keeping effect of the first insulating layer 9 will be weakened. Therefore, compared with the thickness of the main insulating layer of more than 200 mm in general, the present invention intentionally reduces the thickness of the first insulating layer 9 and thickens the second insulating layer 8, and the second insulating layer 8 mainly bears the insulation effect.

[0040] like Figure 1~Figure 5 As shown, a rib plate 4 is integrally connected to the inner side of the lower metal plate 2; the connection line between the rib plate 4 and the lower metal plate 2 passes through both sides of the dihedral angle and intersects with the intersection line of the dihedral angle; the rib plate 4 also forms an angled shape, and the distance between the edge of the rib plate 4 away from the lower metal plate 2 and the upper metal plate 1 is 0.2~5mm; the larger the area of ​​the rib plate 4, the more stress it can share in the dihedral angle area, thereby reducing the stress on the corner of the upper metal plate 1, and better protecting the upper metal plate 1. The minimum spacing of 0.2mm is to prevent the rib plate 4 from contacting the upper metal plate 1, thereby causing unnecessary stress.

[0041] In some embodiments, the plane where the rib plate 4 is located is perpendicular to the intersection line of the dihedral angle, so that the stress in the dihedral angle region is more uniform.

[0042] In some embodiments, Figure 1 As shown, the rib plate 4 is directly connected to the support portion 3 and is integrally connected. Figure 2 , Figure 3 As shown, the rib plate 4 is only indirectly connected to the support portion 3 through the lower metal plate 2 .

[0043] In some embodiments, Figure 1 As shown, the center plane of the rib plate 4 and the support portion 3 in the thickness direction is in the same plane. Figure 2 , Figure 3 As shown, the center planes of the rib plate 4 and the support portion 3 in the thickness direction are in the same plane or parallel to each other, so that the stress distribution of the upper metal plate 1, the support portion 3 and the rib plate 4 is uniform.

[0044] In some embodiments, the thickness of the rib plate 4 and the support portion 3 are both 5 to 15 mm, so that the rib plate 4 and the support portion 3 can withstand stress. Figure 4 and Figure 5 As shown, the rib plate 4 has the same thickness as the support portion 3 .

[0045] The upper metal plate 1 is welded to the main metal film plate 5 on the bottom / wall of the tank to form a main shielding layer, which directly contacts the cryogenic liquid; the lower metal plate 2 is welded to the secondary metal film plate 7 on the bottom / wall of the tank to form a secondary shielding layer.

[0046] In some embodiments, the area of ​​the lower metal plate 2 is larger than that of the upper metal plate 1, and the edge of the lower metal plate 2 is outside the upper metal plate 1, which is used to leave enough space for welding the lower metal plate 2 and the secondary metal film plate 7 on the bottom / wall of the tank. If a first insulating layer 9 is provided between the upper metal plate 1 and the lower metal plate 2, the area of ​​the lower metal plate 2 is larger than the first insulating layer 9, and the edge of the lower metal plate 2 is outside the first insulating layer 9.

[0047] In some embodiments, each of the integrated mounting components comprises at least two support portions 3 and two ribs 4 on either side of the dihedral angle. The purpose is to ensure that the integrated mounting component remains stable when subjected to stress, so that the integrated mounting component does not tilt to one side and lose balance due to only one support portion 3 and rib 4.

[0048] The outer side of the lower metal plate 2 is a second insulating layer 8. The lower metal plate 2 is connected to the second insulating layer 8 via an anchoring screw.

[0049] The present invention also discloses a method for installing the installation structure of the dihedral angle region of the low-temperature storage tank, comprising the following steps:

[0050] S1, manufacturing the integrated mounting assembly by welding or integral molding; in some embodiments, the integrated mounting assembly is then assembled: the first insulating layer 9 is filled between the upper metal plate 1 and the lower metal plate 2;

[0051] S2, fixedly connecting the lower metal plate 2 to the second insulating layer 8 outside the lower metal plate 2, so that the integrated mounting assembly is mounted on the second insulating layer 8;

[0052] S3, the lower metal plate 2 is welded to the secondary metal film plate 7 on the bottom / wall of the storage tank to form a secondary shielding layer;

[0053] S4, laying plywood on the secondary metal film plate 7;

[0054] S5, welding the upper metal plate 1 to the main metal film plate 5 on the bottom / wall of the storage tank to form a main shielding layer.

[0055] The present invention also discloses a storage tank using the above-mentioned dihedral angle region mounting structure, and the storage tank can be used for liquefied gas transport ships or on-land liquefied gas storage or transportation.

[0056] In summary, the present invention connects the upper metal plate and the lower metal plate as a whole, and sets a rib plate with a height close to the main layer at the corner, so that the rib plate can share most of the stress in the corner area, thereby protecting the corner area of ​​the upper metal plate. In addition, by connecting the upper metal plate and the lower metal plate as a whole, the integrated installation assembly used in the present invention is conducive to reducing on-site installation time, with less welding workload, and the secondary shielding layer, the main insulation layer, and the main shielding layer in the corner area can be installed in one time. The upper metal plate and the lower metal plate form a step shape, which is convenient for layered welding to form two independent enclosed spaces.

[0057] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A mounting structure for a dihedral area of ​​a cryogenic storage tank, characterized in that: The mounting structure includes an integrated mounting component; the integrated mounting component is in the shape of a dihedral angle, and includes an upper metal plate and a lower metal plate on either side of the dihedral angle, and the upper metal plate and the lower metal plate on each side are integrally connected through a support portion; a rib plate is also integrally connected to the inner side of the lower metal plate; the connecting line between the rib plate and the lower metal plate passes through both sides of the dihedral angle and intersects with the intersection line of the dihedral angle; the edge of the rib plate away from the lower metal plate is spaced 0.2 to 5 mm from the upper metal plate; the upper metal plate is welded to the main metal film plate on the bottom / wall of the tank to form a main shielding layer; the lower metal plate is welded to the secondary metal film plate on the bottom / wall of the tank to form a secondary shielding layer; the rib plate is directly connected to the support portion and integrally connected, or is only indirectly connected through the lower metal plate.

2. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The support portion has a height within 50 mm.

3. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The plane where the rib plate is located is perpendicular to the intersection line of the dihedral angles.

4. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The center planes of the rib plate and the support portion in the thickness direction are in the same plane or parallel to each other.

5. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The other areas between the upper metal plate and the lower metal plate are filled with a first insulating layer; the first insulating layer is made of a soft heat-insulating material.

6. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The lower metal plate has a larger area than the upper metal plate, and an edge of the lower metal plate is outside the upper metal plate.

7. The installation structure of the dihedral area of ​​the low-temperature storage tank according to claim 1, characterized in that: The thickness of the upper metal plate, the lower metal plate, the rib plate and the support part are all 5-15 mm.

8. The installation structure of the dihedral area of ​​a cryogenic storage tank according to claim 1, characterized in that: Any side of the dihedral angle of each of the integrated mounting components comprises at least two supporting portions and two rib plates.

9. The method for installing the installation structure of the dihedral area of ​​a low-temperature storage tank according to any one of claims 1 to 8, characterized in that: The following steps are included: S1, manufacturing the integrated mounting assembly by welding or integral molding; the inner side of the lower metal plate of the integrated mounting assembly is also integrally connected with a rib plate; S2, fixing and connecting the lower metal plate to a second insulating layer outside the lower metal plate; S3, the lower metal plate is welded to the secondary metal film plate on the bottom / wall of the storage tank to form a secondary shielding layer; S4, laying plywood on the secondary metal film plate; S5, welding the upper metal plate to the main metal film plate on the bottom / wall of the storage tank to form a main shielding layer.

10. A storage tank using the installation structure of the dihedral angle area of ​​a low-temperature storage tank as claimed in any one of claims 1 to 8, characterized in that: The storage tank is used for storing or transporting liquefied gas on a liquefied gas transport ship or on land.

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