Film corrugated plate, film inner tank and film tank

Abstract

The invention relates to the field of liquefied natural gas storage, in particular to a thin-film corrugated plate, a thin-film inner tank and a thin-film tank, and aims to solve the technical problems of complex processing technology and high processing difficulty of corrugated plates in related technologies. According to the thin film corrugated plate, the transverse connecting corrugations and the longitudinal connecting corrugations are communicated through the closed corrugations, transverse and longitudinal intersection is avoided, stress concentration at the intersection of the transverse connecting corrugations and the longitudinal connecting corrugations is reduced, and the closed corrugations can counteract telescopic deformation caused by liquid inlet and outlet and temperature changes; meanwhile, the problem that the structure at the junction of longitudinal corrugations and transverse corrugations is complex is solved; in addition, by the adoption of the design, the connection corrugation and the closed corrugation are simple in structure, and the junction of the connection corrugation and the closed corrugation is communicated and not penetrated, so that the film corrugated plate can be formed through one-time punch forming.

Description

Technical Field

[0001] The invention relates to the field of liquefied natural gas storage, and in particular to a film corrugated plate, a film inner tank and a film tank. Background Art

[0002] LNG membrane tanks are indispensable storage facilities in the liquefied natural gas industry chain. The inner tank of the membrane tank is formed by multiple corrugated plates connected by lap welding.

[0003] At present, the corrugated plates used in China are mainly designed and manufactured by the French GTT company. The corrugated plates adopt a configuration in which longitudinal and transverse corrugations intersect and penetrate each other, and a unique pleated structure is set at the intersection of the two to offset the expansion and contraction deformation caused by the inflow and outflow of liquid and temperature changes. It should be noted that due to its configuration characteristics, the processing technology of the above-mentioned corrugated plates is complicated, and multiple extrusion molding is required, and the processing of the pleats is more difficult. Summary of the invention

[0004] The object of the present invention is to provide a film corrugated plate, a film inner tank and a film tank, so as to solve the technical problems of the corrugated plate processing technology being complicated and difficult in the related art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] In a first aspect, the present invention provides a film corrugated plate, comprising: a formed substrate, closed corrugations and connecting corrugations;

[0007] The closed corrugations are formed on the molding substrate and are circular or regular polygonal, wherein the number of sides of the regular polygon is 4n, where n is a positive integer;

[0008] The edge of the closed corrugation bulges in a direction perpendicular to the forming substrate to form a closed groove in a closed loop state;

[0009] The connecting corrugation is formed on the molding substrate and is in a long strip shape, one end of which is connected to the closed corrugation, and the other end of which extends away from the closed corrugation until it is flush with the edge of the molding substrate;

[0010] The connecting corrugations bulge in the direction in which the closed corrugations bulge, forming a long strip-shaped connecting groove, and the connecting groove is connected to the closed groove;

[0011] There are four connecting corrugations, and the extended lines of the four connecting corrugations intersect at the midpoint of the closed corrugations and form a cross shape.

[0012] Furthermore, the molding substrate is square, and the closed corrugation is located at the center of the molding substrate.

[0013] Furthermore, the raised height and width of the closed corrugation and the connecting corrugation are consistent.

[0014] Furthermore, the connection between the connecting corrugation and the closed corrugation adopts an arc transition.

[0015] Furthermore, the connection between the connecting corrugation and the forming substrate adopts an arc transition;

[0016] The connection between the closed corrugation and the forming substrate also adopts arc transition.

[0017] Furthermore, arc transitions are used between the connected edges of the regular polygon.

[0018] In a second aspect, the present invention provides a film inner tank comprising a plurality of the film corrugated plates described above;

[0019] The plurality of film corrugated plates are distributed in an array, and between adjacent film corrugated plates, two connecting corrugations are overlapped and fixed by welding, and two forming base plates are overlapped and fixed by welding.

[0020] In a third aspect, the present invention provides a film tank comprising a cold-keeping block and the film inner tank;

[0021] The cold-keeping block is opposite to the film corrugated plate and is welded and fixed to the center of the film corrugated plate.

[0022] Furthermore, the film tank also includes a concrete outer tank, and the film inner tank is located inside the concrete outer tank.

[0023] Based on the above technical solutions, the technical effects that can be achieved by the film corrugated plate provided by the present invention are:

[0024] The film corrugated plate comprises a forming substrate, a closed corrugation and a connecting corrugation; the closed corrugation is formed on the forming substrate and is circular or regular polygonal, wherein the number of sides of the regular polygon is 4n, and n is a positive integer; the side of the closed corrugation bulges in a direction perpendicular to the forming substrate to form a closed groove in a closed loop state; the connecting corrugation is formed on the forming substrate and is in a long strip shape, one end of which is connected to the closed corrugation, and the other end extends in a direction away from the closed corrugation to be flush with the side of the forming substrate; the connecting corrugation bulges in the direction of the bulging of the closed corrugation to form a long strip connecting groove, which is connected to the closed groove; there are four connecting corrugations, and the extension lines of the four connecting corrugations intersect at the midpoint of the closed corrugation and are in a cross shape.

[0025] In the film corrugated plate, the forming substrate bulges in a direction perpendicular to itself to form closed corrugations and connecting corrugations, wherein when the closed corrugation is circular, the closed groove formed by it is annular, and when the closed corrugation is a regular polygon, the closed groove formed by it is correspondingly a regular polygon; four connecting corrugations are evenly distributed around the closed corrugation, and two adjacent connecting corrugations are perpendicular to each other.

[0026] By adopting the above design, the transverse connecting corrugations and the longitudinal connecting corrugations are connected through the closed corrugations, thereby avoiding transverse and longitudinal intersections and reducing stress concentration at the intersection of the transverse and longitudinal connecting corrugations. The closed corrugations here can offset the expansion and contraction deformation caused by the inflow and outflow of liquid and temperature changes, and at the same time solve the problem of complex structure at the intersection of the longitudinal corrugations and the transverse corrugations. In addition, by adopting this design, the configuration of the connecting corrugations and the closed corrugations is simple, and the intersection of the connecting corrugations and the closed corrugations is connected without penetrating, so that the film corrugated plate can be stamped and formed in one time.

[0027] It can be seen that compared with the existing technology, the film corrugated plate avoids the intersection of horizontal and vertical corrugations and eliminates the unique structure at the intersection, which is convenient for stamping and forming, thereby greatly reducing the difficulty of processing.

[0028] The beneficial effects of the film inner tank provided by the present invention are:

[0029] The film inner tank provided by the present invention includes a film corrugated plate. Therefore, the technical advantages and effects achieved by the film inner tank also include the technical advantages and effects achieved by the above-mentioned film corrugated plate, which will not be repeated here.

[0030] The beneficial effects of the film tank provided by the present invention are:

[0031] The film tank provided by the present invention includes a film inner tank. Therefore, the technical advantages and effects achieved by the film tank also include the technical advantages and effects achieved by the above-mentioned film inner tank, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic structural diagram of an embodiment of a film corrugated plate provided by the present invention;

[0034] Figure 2 A schematic structural diagram of another embodiment of a film corrugated plate provided by the present invention;

[0035] Figure 3 and Figure 4 Schematic diagram of splicing film corrugated plates according to different embodiments of the present invention.

[0036] Icon: 1-molded substrate; 2-closed corrugation; 3-connected corrugation. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0039] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] At present, the corrugated plates used in China are mainly designed and manufactured by the French GTT company. The corrugated plates adopt a configuration in which longitudinal and transverse corrugations intersect and penetrate each other, and a unique pleated structure is set at the intersection of the two to offset the expansion and contraction deformation caused by the inflow and outflow of liquid and temperature changes. It should be noted that due to its configuration characteristics, the processing technology of the above-mentioned corrugated plates is complicated, and multiple extrusion molding is required, and the processing of the pleats is more difficult.

[0041] In view of this, the present invention provides a film corrugated plate, referring to Figure 1 and Figure 2 The film corrugated plate includes a forming substrate 1, a closed corrugation 2 and a connecting corrugation 3; the closed corrugation 2 is formed on the forming substrate 1 and is circular or regular polygonal, wherein the number of sides of the regular polygon is 4n, and n is a positive integer; the side of the closed corrugation 2 is raised in a direction perpendicular to the forming substrate 1 to form a closed groove in a closed loop state; the connecting corrugation 3 is formed on the forming substrate 1 and is in a long strip shape, one end of which is connected to the closed corrugation 2, and the other end extends in a direction away from the closed corrugation 2 to be flush with the side of the forming substrate 1; the connecting corrugation 3 is raised in the direction of the raised closed corrugation 2 to form a long strip connecting groove, which is connected to the closed groove; there are four connecting corrugations 3, and the extension lines of the four connecting corrugations 3 intersect at the midpoint of the closed corrugation 2 and are in a cross shape.

[0042] In the film corrugated plate, the formed substrate 1 bulges in a direction perpendicular to itself to form closed corrugations 2 and connecting corrugations 3, wherein when the closed corrugation 2 is circular, the closed groove formed by it is annular, and when the closed corrugation 2 is a regular polygon, correspondingly, the closed groove formed by it is a regular polygon; four connecting corrugations 3 are evenly distributed around the closed corrugation 2, and two adjacent connecting corrugations 3 are perpendicular to each other.

[0043] By adopting the above design, the horizontal connecting corrugations 3 are connected with the longitudinal connecting corrugations 3 through the closed corrugations 2, thereby avoiding horizontal and vertical intersections and reducing stress concentration at the intersection of the horizontal and longitudinal connecting corrugations 3. The closed corrugations 2 here can offset the expansion and contraction deformation caused by the inflow and outflow of liquid and temperature changes, and at the same time solve the problem of complex structure at the intersection of the longitudinal corrugations and the horizontal corrugations. In addition, by adopting this design, the connecting corrugations 3 and the closed corrugations 2 have a simple configuration, and the connecting corrugations 3 and the closed corrugations 2 are connected at the intersection without penetrating, so that the film corrugated plate can be stamped and formed in one time.

[0044] It can be seen that compared with the existing technology, the film corrugated plate avoids the intersection of horizontal and vertical corrugations and eliminates the unique structure at the intersection, which is convenient for stamping and forming, thereby greatly reducing the difficulty of processing.

[0045] The following combination Figures 1 to 4 The structure and shape of the film corrugated plate provided in this embodiment are described in detail:

[0046] For further reference, Figure 1 and Figure 2 The molding substrate 1 is square, and the closed corrugation 2 is located at the center of the molding substrate 1 .

[0047] Specifically, Figure 1 For example, the forming substrate 1 is made of stainless steel with a thickness of 1.2 to 2 mm, specifically 1.2 mm, 1.6 mm or 2 mm, etc., and a side length of 1 to 3 m, specifically 1 m, 2 m or 3 m, etc. Compared with the existing corrugated plate of 2 m × 3.5 m, the film corrugated plate made of the forming substrate 1 can be applied to film inner tanks of different diameters, without the need to prefabricate corrugated plates of different sizes, reducing the difficulty of prefabrication and construction, and thus more conducive to large-scale modular installation. In addition, the closed corrugation 2 is located at the center of the forming substrate 1, that is, the closed corrugation 2 and the connecting corrugation 3 are located as a whole at the center of the forming substrate 1. Such a design makes the stress distribution of the film corrugated plate uniform, ensuring the overall stability and safety of the film inner tank.

[0048] For further reference, Figure 1 and Figure 2The raised height and width of the closed corrugation 2 and the connecting corrugation 3 are consistent, and the raised height is 50-120㎜, specifically 50㎜, 80㎜ or 120㎜, etc.; the connection between the two adopts an arc transition; furthermore, the connection between the connecting corrugation 3 and the forming substrate 1 adopts an arc transition; the connection between the closed corrugation 2 and the forming substrate 1 also adopts an arc transition, and when the closed corrugation 2 is a square (n is 1), an arc transition is adopted between the connected sides of the regular polygon.

[0049] In the above design, each joint adopts arc transition connection, and the closed corrugation 2 and the connecting corrugation 3 adopt arcs of the same shape and size, so as to minimize stress concentration, reduce the excessive difference in thinning amount caused by stamping, reduce the generation of residual stress, and make the film corrugated plate have good force characteristics.

[0050] The membrane corrugated plate provided by the present invention has a simple structure, and the corrugated shape and size are consistent, so it is easy to form and process. The membrane corrugated plate is a centrally symmetrical figure, and the closed corrugation 2 is a regular polygon or a circle. The force is more uniform, and the complexity of the construction process is reduced. In addition, the membrane corrugated plate reduces the stress concentration at the intersection by optimizing the structure of the intersection between the corrugation and the substrate, and the corrugation and the corrugation, and the control of the thinning amount is more reasonable, thereby solving the deformation problem of the steel plate inside the low-temperature LNG membrane tank under the action of temperature load, fully considering the thermal expansion and contraction effect caused by temperature changes, and the number of cyclic loadings during the service life of the membrane tank, solving the problems of large deformation of ordinary steel plates, insufficient fatigue life, and accumulation of plastic deformation, so that large LNG membrane tanks can be normally constructed and put into production.

[0051] The present invention also provides a thin film inner tank, referring to Figure 3 and Figure 4 The film inner tank includes a plurality of film corrugated plates; the plurality of film corrugated plates are distributed in an array, and between adjacent film corrugated plates, two connecting corrugations 3 are overlapped and welded and fixed, and two forming base plates 1 are overlapped and welded and fixed.

[0052] Specifically, refer to Figure 3 The membrane corrugated plates are connected to form a sealed space by overlapping and welding. Since standard prefabricated corrugated plates are used, automatic welding can be used to reduce labor and ensure welding quality. In addition, the inner flat plate area surrounded by the edges of the closed corrugated plates 2 can be used as a construction channel to reduce trampling and damage to the welds.

[0053] As the film tank flows in and out of the liquid and the temperature changes, the film corrugated sheet will shrink or expand, and the existence of the corrugated structure can offset these expansions and contractions, thereby reducing damage to the welds, making the welds more evenly stressed, and ensuring the overall stability and safety of the film inner tank. At the same time, it should be added that the film corrugated sheet is not the main stress-bearing element, and it mainly plays a sealing role. The hydraulic pressure is transmitted to the concrete outer tank through the film corrugated sheet. Therefore, the thickness of the film corrugated sheet is as small as possible, which is also convenient for the implementation of the stamping process.

[0054] Compared with the prior art, the present invention adopts the finite element topology optimization method to optimize the design of the film configuration under different pressure loads and temperature loads, and designs the overall configuration scheme of the inner ring closed corrugation 2 and the external connecting corrugation 3, so as to generate sufficient deformation to offset the deformation of the steel plate caused by temperature changes, while meeting the strength requirements and fatigue life requirements.

[0055] In addition, since the film inner tank provided by the present invention includes a film corrugated plate, the technical advantages and effects achieved by the film inner tank also include the technical advantages and effects achieved by the above-mentioned film corrugated plate, which will not be repeated here.

[0056] The present invention also provides a film tank, comprising a cold insulation block, a concrete outer tank and a film inner tank; the cold insulation block is opposite to the film corrugated plate and is welded and fixed to the center of the film corrugated plate; the film inner tank is inside the concrete outer tank.

[0057] Specifically, when the cold insulation block is welded to the film corrugated plate, due to the small size of a single film corrugated plate, the shrinkage of a single film corrugated plate under shrinkage conditions is small. In this case, the cold insulation block only needs to be welded to the center of the film corrugated plate, and there is no need to weld to the four sides of the film corrugated plate, thereby reducing the fixed welding amount compared to the prior art.

[0058] In addition, since the film tank includes a film inner tank, the technical advantages and effects achieved by the film tank also include the technical advantages and effects achieved by the above-mentioned film inner tank, which will not be repeated here.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A film corrugated plate, characterized in that: include: A forming substrate (1), a closed corrugation (2) and a connecting corrugation (3); The closed corrugations (2) are formed on the molding substrate (1) and are circular or regular polygonal, wherein the number of sides of the regular polygon is 4n, where n is a positive integer; The edges of the closed corrugations (2) are raised in a direction perpendicular to the forming substrate (1), forming a closed groove in a closed loop state; The connecting corrugation (3) is formed on the forming substrate (1) and is in the shape of an elongated strip, one end of which is connected to the closed corrugation (2), and the other end of which extends in a direction away from the closed corrugation (2) until it is flush with the edge of the forming substrate (1); The connecting corrugation (3) bulges in the direction of the bulging of the closed corrugation (2) to form a long strip-shaped connecting groove, and the connecting groove is connected to the closed groove; There are four connecting corrugations (3), and the extended lines of the four connecting corrugations (3) intersect at the midpoint of the closed corrugation (2) and form a cross shape.

2. The film corrugated plate according to claim 1, characterized in that: The molded substrate (1) is square, and the closed corrugation (2) is located at the center of the molded substrate (1).

3. The film corrugated plate according to claim 1, characterized in that: The raised height and width of the closed corrugation (2) and the connecting corrugation (3) are consistent.

4. The film corrugated plate according to claim 3, characterized in that: The connection between the connecting corrugation (3) and the closed corrugation (2) adopts an arc transition.

5. The film corrugated plate according to claim 4, characterized in that: The connection between the connecting corrugation (3) and the forming substrate (1) adopts an arc transition; The connection between the closed corrugation (2) and the molded substrate (1) also adopts an arc transition.

6. The film corrugated plate according to claim 1, characterized in that: Arc transition is adopted between the connected edges of the regular polygon.

7. A film inner tank, characterized in that: comprising a plurality of film corrugated sheets as claimed in any one of claims 1 to 6; The plurality of film corrugated plates are distributed in an array, and between adjacent film corrugated plates, two connecting corrugations (3) are overlapped and fixed by welding, and two forming base plates (1) are overlapped and fixed by welding.

8. A film tank, characterized in that: It comprises a cold-keeping block and a film inner tank as claimed in claim 7; The cold-keeping block is opposite to the film corrugated plate and is welded and fixed to the center of the film corrugated plate.

9. The film tank according to claim 8, characterized in that: The membrane tank further comprises a concrete outer tank, and the membrane inner tank is located inside the concrete outer tank.

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