Center arched and wrinkled corrugated LNG (Liquefied Natural Gas) film enclosure system structure and assembly method

Abstract

The invention discloses a center arch-shaped and wrinkled corrugated LNG film enclosure system structure and an assembly method.The center arch-shaped and wrinkled corrugated LNG film enclosure system structure comprises a straight plate, fixing holes used for installation are formed in the corner ends of the straight plate, long corrugations are formed in the straight plate through one-time stamping, and the long corrugations are arranged on the straight plate. The long corrugations are perpendicular to the plate edge of the straight plate; corrugated wrinkles are formed on the long corrugations through secondary stamping, central arch structures are formed on the flat and straight plates through secondary stamping, and every two adjacent flat and straight plates are welded and connected at the edges of the long corrugation structures perpendicular to the plate edges to form a complete enclosure system main shielding layer. The long corrugations of every two adjacent straight plates are in butt joint to form a plurality of sets of closed and through corrugated film structures, and the long corrugations of every two adjacent straight plates are in butt joint to form a plurality of sets of center arch nodes of the film enclosure system structure. The device has the advantages of being good in economy, simple in structure and convenient to install, and the stability of the structure is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of liquefied natural gas storage, in particular to a center-arched and corrugated LNG thin film enclosure system structure and an assembling method. BACKGROUND

[0002] As a key carrier in the green energy system, the storage and transportation efficiency of liquefied natural gas (LNG) directly affects the operation efficiency of the energy chain. In order to realize large-scale long-distance transportation, LNG needs to be liquefied at -162 DEG C, greatly compressed in volume and increased in density. The thin film type storage tank and other forms of thin film maintenance system have become the mainstream technical choice for LNG storage due to the reasons of lightweight and excellent sealing performance. The corrugated metal thin film plate, which is the core structure of the storage tank, has multiple properties of pressure bearing, temperature resistance and corrosion resistance, and becomes a key technical link to ensure the safe operation of the storage tank.

[0003] In terms of material selection, although the traditional high-nickel alloy material has excellent performance, it is expensive and complex to process, which seriously restricts its large-scale promotion. With the progress of material engineering and manufacturing process, metal materials such as 304L stainless steel have gradually become alternative choices with cost advantages. By introducing the corrugated configuration design, the thin film plate not only realizes stress dispersion and deformation control, but also has excellent thermal expansion and contraction adaptability, and still maintains structural stability under extreme temperature difference. Research shows that this configuration scheme can reduce the overall construction cost by about 40%, and significantly compress the construction period.

[0004] In the current international thin film storage tank technology pattern, the French GTT company maintains a monopoly position relying on its patented double-layer corrugated structure. Japanese and Korean enterprises improve the assembly efficiency through standardization and modularization. Compared with this, although China has initially realized the engineering application of large-scale thin film tanks, there are still short boards in the optimization of corrugated design, the construction of welding process database and other core fields. This technical gap makes about 15%-20% of the cost of each storage tank need to be paid for foreign technology authorization fees.

[0005] Therefore, it has become a key direction of technical development to build a localized and self-controllable thin film structure system. Through the integration of material performance improvement, corrugated structure topology optimization and digital simulation process and other multi-element innovation paths, it is expected to break the monopoly of foreign patents and build a new LNG storage technology system suitable for the high-salt-mist environment in China's coastal areas, providing solid support for national energy security and industrial self-reliance. SUMMARY

[0006] The purpose of the present application is to provide a center-arched and corrugated LNG thin film enclosure system structure and an assembling method, which is applied to the inside of the LNG thin film tank body, has the advantages of good economy, simple structure and convenient installation, and solves the problems in the prior art.

[0007] To achieve the above object, the present application provides the following technical solutions:

[0008] A center arch and corrugated wave LNG thin film enclosure system structure, comprising a flat plate, the corner end of the flat plate is provided with a fixing hole for installation, a long wave is formed on the flat plate by one stamping, and the long wave is perpendicular to the plate edge of the flat plate; a wave corrugation is formed on the long wave by two stampings, a center arch structure is formed on the flat plate by two stampings, and the long waves of two adjacent flat plates are connected by welding at the long wave structure edge perpendicular to the plate edge to form a complete main shielding layer of the enclosure system; the long waves of the two adjacent flat plates are butt-jointed to form a plurality of closed and through wave film structures, the wave film structure is used for absorbing the deformation of the flat plate caused by thermal expansion and cold contraction, enhancing the hydraulic pressure bearing capacity of the flat plate, and realizing displacement compensation under the impact of liquid cargo sloshing and static load; the long waves of the two adjacent flat plates form a plurality of center arch nodes of the thin film enclosure system structure after butt-joint.

[0009] Preferably, the flat plate is installed on the surface of the thermal insulation structure of the inner wall of the enclosure system through the fixing hole by bolts to realize structural connection and fixation.

[0010] It is worth noting that the flat plate can ensure the overall stability of the main shielding layer of the enclosure system and avoid the separation of the film layer from the thermal insulation structure due to the liquid cargo load; however, it is necessary to ensure the flatness of the flat plate and the thermal insulation layer after connection to avoid the loss of cold energy through the gap; the edge of the flat plate needs to be aligned with the edge of the thermal insulation layer to prevent local cold exposure.

[0011] Preferably, the single flat plate is made of 304L austenitic stainless steel by stamping, and the main shielding layer of the enclosure system is composed of a plurality of flat plates arranged continuously and welded.

[0012] It is worth noting that the main shielding layer of the enclosure system in the full-enclosure form forms a closed structure through the welding of a plurality of flat plates, and compared with the non-full-enclosure structure, the structure has higher stability and better protection performance; however, it is necessary to use ultra-low carbon welding wire such as ER308L when welding 304L to avoid intergranular corrosion.

[0013] Preferably, the main shielding layer of the enclosure system is a structure directly contacting with the liquid cargo in the liquid tank, and the main shielding layer can bear the anti-sloshing and impact capacity during continuous loading of the liquid tank load.

[0014] It is worth noting that the main shielding layer of the enclosure system is directly stressed, the intermediate force transmission components are reduced, and the load transmission efficiency is high; however, it is necessary to regularly detect the surface of the main shielding layer of the enclosure system to check the low-temperature fatigue cracks.

[0015] Preferably, the material of the main shielding layer of the enclosure system is a composite material or a corrugated steel plate represented by 304L; the long wave is a continuous arch wave.

[0016] It is worth noting that the thickness and size of the flat plate of the continuous arched corrugation are selected according to the test and actual application environment requirements; but attention should be paid to the verification of the interlayer bonding strength of the composite material to avoid low-temperature delamination; the residual stress of the 304L corrugated steel plate after corrugation forming should be controlled, and the stress is less than or equal to 150 MPa to prevent stress corrosion.

[0017] The application also provides an assembly method of the center arched and corrugated LNG film enclosure system structure, which comprises the center arched and corrugated LNG film enclosure system structure as described above, and the steps of the assembly method are as follows:

[0018] S1: prefabricating a single flat plate to ensure that the fixed holes, long corrugations, corrugated folds and center arched structures on the flat plate are formed completely;

[0019] S2: sequentially arranging a plurality of prefabricated flat plates side by side to align the long corrugation edges of adjacent flat plates;

[0020] S3: welding the long corrugation edges of adjacent flat plates to form a complete enclosure system main shielding layer, and the main shielding layer is in a full-enclosing form, and the long corrugation edges of adjacent flat plates are connected to form a corrugated film structure and a center arched node during the welding process;

[0021] S4: installing the main shielding layer on the surface of the enclosure system inner wall heat preservation structure as a whole through the fixed holes at the corners of the flat plate by using bolts to complete the installation of the LNG film enclosure system film structure.

[0022] It is worth noting that the fixed holes 2 realize the final fixation of the main shielding layer and the heat preservation structure; but attention should be paid to the fact that the bolt holes and the heat preservation layer embedded nuts need to be aligned, and the coaxiality error is less than or equal to 0.5 mm; after installation, low-temperature sealant such as silicone sealant needs to be applied on the bolt head to prevent cold leakage.

[0023] Preferably, in the step S1, a plurality of flat plates 1 can be prefabricated into a prefabricated unit by welding and assembling the long corrugation 3 edges according to the construction needs, and then the subsequent steps S2 to S4 are installed.

[0024] It is worth noting that the prefabricated unit can reduce the amount of on-site welding and improve the construction efficiency; but attention should be paid to the fact that the maximum size of the prefabricated unit needs to meet the transportation height and width limits.

[0025] Preferably, the prefabrication work in the step S1 can be completed before the tank body or other types of enclosure system devices are closed, realizing modular supply, facilitating transportation and storage, and shortening the construction period.

[0026] It is worth noting that the modular supply can simplify the supply chain management and facilitate transportation and storage; but attention should be paid to the fact that the modular packaging needs to have moisture-proof and impact-proof functions.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] The containment system structure of the present application is a main shielding layer composed of a large number of single film plates welded together and directly contacted with liquid cargo in the tank, and the main shielding layer containment system structure can bear the anti-sloshing and impact capacity when the tank load is continuously loaded.

[0029] The present application is designed to use a complete main shielding layer composed of a large number of thin film plates welded together, which is made of composite material or corrugated steel plate represented by 304L, thereby improving the overall strength and increasing the reliability and safety of the containment system structure.

[0030] The main shielding layer composed of a large number of single film plates welded together in the present application is a high-strength composite material or corrugated steel plate structure, which can absorb the deformation of the film plate due to thermal expansion and contraction in the longitudinal and transverse directions, and the continuous arched corrugation increases the extensibility of the film plate, the design is simpler than the prior art, and the material cost is reduced; the continuous arched corrugation design can select specific plate thickness and size according to the requirements of tests and actual application environment, and is more flexible.

[0031] The present application can be modularly supplied, most of the prefabrication work can be carried out before the tank or other types of containment system devices are folded, which is convenient for transportation, storage and other supply chain links, thereby reducing the construction period.

[0032] The containment system structure of the present application is a main shielding layer composed of a large number of single film plates welded together, which is in a fully enclosed form, has higher structural stability and better protection performance. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a sectional view of the overall structure of the present application;

[0034] Figure 2 is a first local detail sectional view of the present application;

[0035] Figure 3 is a second local detail sectional view of the present application;

[0036] Figure 4 is a schematic diagram of continuous arrangement and assembly of the present application;

[0037] Figure 5 is a schematic diagram of the overall structure of the present application.

[0038] Reference signs: 1, flat plate; 2, fixing hole; 3, long corrugation; 4, corrugation fold; 5, center arched structure; 6, corrugated film structure; 7, center arched node. DETAILED DESCRIPTION

[0039] In the wave of low-carbon transformation of global energy structure, liquefied natural gas (LNG) has become the core hub connecting traditional fossil energy and renewable energy due to its clean combustion and low carbon emissions. Its strategic position in the energy supply chain continues to rise. According to the International Gas Union (IGU) data, global LNG trade volume exceeded 400 million tons in 2024, and is expected to reach 550 million tons in 2030. Such large-scale energy flow puts high requirements on the efficiency and safety of storage and transportation. The core of LNG storage and transportation is "low-temperature liquefaction" - under standard atmospheric pressure, natural gas is cooled to an ultra-low temperature of -162℃, its volume can be compressed to 1 / 625 of the gaseous state, and its density is greatly increased to 420-450 kg / m 3 This feature makes it possible for long-distance transportation and large-scale storage on land, and the performance of the storage and transportation system directly determines the loss rate and stability of the energy chain from the production end to the consumption end.

[0040] Among many LNG storage technologies, thin film type storage tanks and supporting thin film enclosure systems have surpassed full containment and single containment tanks and become the preferred technical solution for current large-scale LNG receiving stations and floating LNG devices. The core lies in their dual advantages of lightweight and high sealing performance. Compared with the steel shell weight of thousands of tons of traditional full containment tanks, thin film enclosure systems use thin metal plates as the core shielding layer, and the overall weight can be reduced by more than 60%. Not only does it greatly reduce the load pressure of the storage tank foundation, but it also adapts to weight-sensitive application scenarios such as floating platforms. More importantly, the thin film structure forms a gapless closed space through integrated welding, and the LNG leakage rate can be controlled below 1×10 -7 m 3 / h, which is much better than the leakage standard of full containment tanks. This high sealing performance is particularly important in an ultra-low temperature environment of -162℃. Once a leak occurs, the low-temperature medium may cause the surrounding structure to crack, leading to serious safety accidents. The core component of the thin film enclosure system, "corrugated metal film plate", integrates pressure resistance, ultra-low temperature resistance, corrosion resistance and other multiple performances. It needs to withstand the static pressure of LNG, ultra-low temperature impact and dynamic load generated by liquid cargo sloshing, while resisting the corrosion of trace amounts of acidic gas in LNG. It is the technical core that ensures the safe operation of the entire storage tank.

[0041] From the perspective of material technology evolution, the selection of thin film plate materials always revolves around the two goals of "performance matching" and "cost control"; Early thin film storage tanks generally use high-nickel alloy materials. Although such materials can maintain excellent toughness and strength in ultra-low temperature environments of-196 ℃, their preparation process is extremely complex. For example, 9% nickel steel needs to go through multiple quenching and tempering heat treatments, and the heat input during welding needs to be strictly controlled to prevent intergranular corrosion, which results in a material cost of up to 40,000 yuan per ton, and a processing cost that is more than three times that of ordinary steel. The high cost of high-nickel alloy thin film plates makes them only applicable to small high-end storage tanks, severely restricting the large-scale promotion of LNG storage technology. With the progress of material science and manufacturing technology, 304L austenitic stainless steel has gradually become an ideal substitute for high-nickel alloy due to its more balanced performance and cost advantage. 304L stainless steel not only maintains a yield strength of more than 180 MPa and an impact energy of more than 30 J at-196 ℃ in ultra-low temperature environments, meeting the mechanical requirements of LNG storage, but also has corrosion resistance that can cope with trace impurities in LNG and salt spray corrosion in coastal environments. More importantly, the market price of 304L stainless steel is only 60% of that of 9% nickel steel, and it has excellent stamping performance, allowing complex corrugated structures to be completed in one stamping, with a processing efficiency improvement of more than 50%.

[0042] To further release the performance potential of 304L stainless steel, technicians introduced corrugated structure design, which completely changed the stress mode of thin film plates. Traditional flat thin film plates are prone to warping deformation due to thermal expansion and contraction in low temperature environments, while the corrugated structure can disperse the stress caused by temperature changes into the folds and curved surfaces of the corrugations through the "deformation buffering" principle. Experimental data shows that the deformation absorption of 304L stainless steel thin film plates with continuous corrugations is more than 80% higher than that of flat plates, and the structural fatigue life can reach more than 20 years in the cyclic alternation of-162 ℃ and room temperature. At the same time, the corrugated structure can also significantly improve the pressure resistance of the thin film plate. By optimizing the corrugation height and spacing, the hydraulic bearing limit of the thin film plate can be increased from 0.3 MPa of the flat plate to 0.8 MPa, fully meeting the pressure requirements of large-scale LNG storage tanks. This "material + structure" collaborative innovation not only reduces the overall construction cost of LNG storage tanks by 40%, but also compresses the construction period to 18-24 months, which is 30% shorter than the traditional scheme, removing the cost barrier for the large-scale application of LNG storage technology.

[0043] From the international technology competition pattern, the core technology of LNG thin film containment system is still monopolized by a few companies. As the industry leader, French GTT company occupies more than 80% of the global high-end market share with its patented "double-layer corrugated structure". This structure forms a buffer space through the inner and outer two-layer corrugated film, further improving the sealing performance and deformation resistance, but the patent authorization fee is high, reaching 1.2 million yuan per 100,000 m 3The LNG tank needs to pay about 2000 million dollars for the use of technology; Japanese and Korean enterprises take the route of "standardization + modularization", such as Kawasaki Heavy Industry in Japan and Samsung Heavy Industries in South Korea. Through the establishment of thin film plate prefabrication production line, the size of single thin film plate is standardized, and the welding and assembly of multiple plates are completed in advance to form modular components. Only the assembly needs to be done on site, and the assembly efficiency is improved by 40% compared with the traditional process. This mode makes it have strong competitiveness in the field of floating LNG devices.

[0044] In contrast, China has realized 16 million m 3 The engineering application of large LNG thin film storage tank, but there are obvious short boards in the core technology field. In the optimization of corrugated design, the existing corrugated structure in China is mostly imitated from GTT scheme, lacking independent topology optimization model, resulting in 20% lower deformation absorption efficiency of corrugated than GTT double-layer corrugated; In the construction of welding process database, there is insufficient accumulation of welding parameters for 304L stainless steel in-162 ℃ environment, and the low temperature toughness of welded joint fluctuates greatly, which needs to rely on foreign detection standard for quality verification; In addition, in the aspect of digital simulation, domestic simulation platform covering the whole process of "material-structure-construction" has not been established, which cannot accurately predict the performance degradation of thin film plate in long-term service. These short boards make China pay about 15%-20% of the cost of each LNG thin film tank for foreign technology authorization and detection fees, which seriously restricts the independent development of the industry.

[0045] In the face of this situation, building a localized and self-controllable thin film structure technology system has become the key direction for China's LNG industry to break through; In the material aspect, 304L stainless steel can be modified by micro-alloying technology, adding elements such as Nb and Ti to refine the grain, further improve its low temperature toughness and corrosion resistance, and adapt to the special environment of high salt fog and high humidity in China's coastal areas; In the aspect of structural design, we need to break through the patent barriers of GTT and develop a new topology structure of "central arch + corrugated corrugation", optimize the corrugated parameters through finite element simulation, and make the deformation absorption efficiency reach the international advanced level; In the process aspect, a low-temperature welding process database for 304L stainless steel should be established, the optimal parameters of different plate thickness and different welding methods should be determined, and the whole process digital control of thin film plate prefabrication, transportation and installation should be realized combined with BIM technology to improve the construction precision and efficiency.

[0046] This multi-element innovation path not only breaks the monopoly of foreign patents, but also forms a technology characteristic that adapts to China's energy demand. For example, in the face of the environment of many typhoons and high salt mist along the coast of China, a polytetrafluoroethylene corrosion-resistant coating can be coated on the surface of the thin film plate to reduce the salt mist corrosion rate to 0.001 mm / year. In view of the characteristics of the wide distribution of LNG receiving stations in China, modular prefabrication technology is developed to realize the mode of "factory prefabrication-remote installation", shorten the project construction period, and ultimately reduce the construction cost of LNG storage tanks in China by 15% through the construction of independent technology system. The dependence on technology licensing is reduced to less than 5%. This not only ensures the safety and stability of China's LNG energy supply chain, but also promotes the domestic thin film technology to the international market.

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0048] In order to solve the problems of inconvenient assembly and poor stability in the prior art, the following technical scheme is given. Please refer to Figures 1-5 ;

[0049] A center arch and corrugated wave LNG thin film enclosure system structure, comprising a flat plate 1, the corner end of the flat plate 1 is provided with a fixing hole 2 for installation, a long wave 3 is formed on the flat plate 1 by one-stroke stamping, and the long wave 3 is perpendicular to the plate edge of the flat plate 1; a wave corrugation 4 is formed on the long wave 3 by two-stroke stamping, a center arch structure 5 is formed on the flat plate 1 by two-stroke stamping, and the long waves 3 of two adjacent flat plates 1 are welded at the edges of the long waves 3 perpendicular to the plate edges to form a complete main shielding layer of the enclosure system; the long waves 3 of the two adjacent flat plates 1 are butted to form a plurality of closed and through wave film structures 6, the wave film structure 6 is used for absorbing the deformation of the flat plate 1 caused by thermal expansion and cold contraction, enhancing the hydraulic bearing capacity of the flat plate 1, and realizing displacement compensation under the action of liquid cargo sloshing impact and static load; the long waves 3 of the two adjacent flat plates 1 form a plurality of center arch nodes 7 of the thin film enclosure system structure after being butted, and the flat plate 1 is installed on the surface of the heat preservation structure of the inner wall of the enclosure system through the fixing hole 2 and bolts to realize structure connection and fixation, and the single flat plate 1 is made of 304L austenitic stainless steel by stamping, the main shielding layer of the enclosure system is welded by a plurality of flat plates 1 arranged continuously, the main shielding layer of the enclosure system is a structure directly contacting with liquid cargo in the liquid tank, and the main shielding layer can bear the anti-sloshing and impact capacity during continuous loading of the liquid tank load, the material of the main shielding layer of the enclosure system is a composite material or a corrugated steel plate represented by 304L; the long wave 3 is a continuous arch wave, and the thickness and size of the flat plate 1 of the continuous arch wave are selected according to the test and actual application environment requirements.

[0050] Single plate connection: during the welding process, the adjacent edges of two symmetrical single plates are butted, the long waves 3 perpendicular to the plate edges are welded with the long waves 3 of the adjacent plates, and the two plates are welded at the junction. The closed and through wave film structure 6 is formed by the butt joint of the two long waves perpendicular to the plate edges, and the plurality of center arch nodes 7 of the thin film maintenance system structure are formed by the butt joint of the long waves 3 perpendicular to the plate edges.

[0051] Continuous arrangement of thin film plates: the single thin film plates are connected with each other by welding, and can be continuously arranged on the inner surface of the enclosure system, and the specific implementation effect is as shown in Figure 4 The continuously arranged corrugated plates constitute a sealed internal structure of the LNG thin film enclosure system to accommodate the stored low-temperature LNG and bear various loads in the enclosure system.

[0052] Thin film plate fixation: in an embodiment of the present application, the fixing hole 2 on the flat plate 1 is fixed and installed on the surface of the heat preservation structure inside the thin film maintenance system tank body by bolts.

[0053] Arrangement of the enclosure system: in one embodiment of the present application, the whole inner wall structure of the connected flat plate 1 is designed as a curved surface, and the curvature is consistent with the curvature of the LNG film enclosure system inner wall where the film plate is installed, as shown in the form of continuous arrangement, which constitutes a complete continuous film maintenance system inner film to fit the enclosure system for installation and implementation. Figure 4

[0054] The present application also provides an assembly method of a center arch and corrugated wave LNG film enclosure system structure, which comprises a center arch and corrugated wave LNG film enclosure system structure as described above, and the assembly method comprises the following steps:

[0055] S1: prefabricate a single flat plate 1 to ensure that the fixing hole 2, long wave 3, wave corrugation 4 and center arch structure 5 on the flat plate 1 are formed completely;

[0056] S2: arrange a plurality of prefabricated flat plates 1 side by side in sequence, so that the long wave 3 edges of adjacent flat plates 1 are aligned;

[0057] S3: weld the long wave 3 edges of adjacent flat plates 1 to form a complete enclosure system main shielding layer, which is in a full-enclosing form, and the long wave 3 of adjacent flat plates 1 is connected to form a wave film structure 6 and a center arch node 7 during the welding process;

[0058] S4: install the main shielding layer as a whole on the surface of the inner wall insulation structure of the enclosure system by using bolts through the fixing hole 2 at the corner end of the flat plate 1, and complete the installation of the LNG film enclosure system film structure.

[0059] The enclosure system structure of the present application is a main shielding layer composed of a large number of single film plates which are completely surrounded and welded, and which directly contact with the liquid cargo in the tank. The material is a composite material or a corrugated steel plate represented by 304L, which adopts continuous arch corrugation to increase the extensibility of the film plate. The design is simpler than the prior art, and the material and transportation and storage costs are reduced. The continuous arch corrugation design can select specific plate thickness and size according to tests and actual application environment, which is more flexible. The continuous arch corrugation increases the contact area of the single plate with the liquid cargo in the tank, which is beneficial to increase the ductility when subjected to load and reduce the welding workload of the cargo tank. The film plate is arranged and welded continuously according to the needs, and there is no loading restriction, and the film is not easy to be damaged.

[0060] ​It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, since the scope of the present application will be limited to the appended claims. It must be noted that, as used in the specification and the appended claims, the singular form "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a plurality of components. Also, the terms "comprises," "comprising," "includes," "including" or "contains," "containing," or variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, includes or contains a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "about" and "substantially" are used herein to represent approximately, in the sense of close or approximate.

[0061] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, many modifications, changes, substitutions, and alterations of the embodiments of the application can be made without departing from the spirit and scope of the application.

Claims

1. A central arched and corrugated waved LNG membrane enclosure system structure comprising flat plates (1), characterized in that, The corner end of the flat plate (1) is provided with a fixing hole (2) for installation, the flat plate (1) is formed with a long corrugation (3) by one-time stamping, and the long corrugation (3) is perpendicular to the plate edge of the flat plate (1); the long corrugation (3) is formed with a corrugation fold (4) by two-time stamping, the flat plate (1) is formed with a center arched structure (5) by two-time stamping, and the long corrugations (3) of two adjacent flat plates (1) are welded at the structure edge perpendicular to the plate edge to be connected, so as to form a complete main shielding layer of the containment system; the long corrugations (3) of the two adjacent flat plates (1) are butted to form a plurality of closed and penetrating corrugated film structures (6), the corrugated film structure (6) is used for absorbing the deformation of the flat plate (1) caused by thermal expansion and cold contraction, enhancing the hydraulic bearing capacity of the flat plate (1), and realizing displacement compensation under the action of liquid cargo sloshing impact and static load; and a plurality of center arched nodes (7) of the film containment system structure are formed after the long corrugations (3) of the two adjacent flat plates (1) are butted.

2. A central arched and corrugated waved LNG membrane enclosure system structure according to claim 1, characterized in that, The flat plate (1) is installed on the surface of the inner wall thermal insulation structure of the containment system through the fixing hole (2) and the bolt, so as to realize the structural connection and fixation.

3. A central arched and corrugated waved LNG membrane enclosure system structure according to claim 2, characterized in that, The single flat plate (1) is made of 304L austenitic stainless steel by stamping, and the main shielding layer of the containment system is composed of a plurality of flat plates (1) arranged in series and welded.

4. A central arched and corrugated waved LNG membrane enclosure system structure according to claim 3, characterized in that, The main shielding layer of the containment system is a structure directly contacted with the liquid cargo in the liquid tank, and the main shielding layer can bear the anti-sloshing and impact capacity during continuous loading of the liquid tank load.

5. A central arched and corrugated waved LNG membrane enclosure system structure according to claim 4, characterized in that, The material of the main shielding layer of the containment system is a composite material or a corrugated steel plate represented by 304L; and the long corrugation (3) is a continuous arched corrugation.

6. A method of assembling a center-arched and corrugated-waved LNG membrane containment system structure comprising the center-arched and corrugated-waved LNG membrane containment system structure of claim 5, wherein, The steps of the assembly method are as follows: S1: prefabricate a single flat plate (1) to ensure that the fixing hole (2), the long corrugation (3), the corrugation fold (4) and the center arched structure (5) on the flat plate (1) are completely formed; S2: arrange a plurality of prefabricated flat plates (1) in sequence side by side, so that the long corrugations (3) of the adjacent flat plates (1) are aligned; S3: weld the long corrugations (3) of the adjacent flat plates (1) to form a complete main shielding layer of the containment system, the main shielding layer is in a full-enclosing form, and the long corrugations (3) of the adjacent flat plates (1) are butted to form the corrugated film structure (6) and the center arched node (7) during the welding process; S4: install the main shielding layer as a whole on the surface of the inner wall thermal insulation structure of the containment system through the fixing hole (2) at the corner end of the flat plate (1) and the bolt, and complete the installation of the film structure of the LNG film containment system.

7. A method of assembling a central arched and corrugated waved LNG membrane enclosure system structure according to claim 6, characterized in that, In the step S1, a plurality of flat plates (1) can be prefabricated into a prefabricated unit by welding the long corrugation (3) edges according to the construction needs, and then the subsequent steps S2 to S4 are installed.

8. A method of assembling a central arch and corrugated wave LNG membrane enclosure system structure according to claim 7, characterized in that, The prefabrication work in the step S1 can be completed before the tank body or other types of containment system devices are closed, so as to realize modular supply, facilitate transportation and storage, and shorten the construction period.

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