Heat insulation layer structure and film type enclosure system

Abstract

The invention relates to the technical field of liquefied natural gas storage and transportation, and provides a heat insulation layer structure and a thin film type enclosure system.The heat insulation layer structure comprises heat insulation modules and elastic connecting pieces; a plurality of heat insulation modules are arranged, and the plurality of heat insulation modules are mutually spliced; the adjacent heat insulation modules are provided with connecting sites corresponding in position, and the two ends of the elastic connecting piece are connected with the connecting sites corresponding in position on the adjacent heat insulation modules respectively, so that the adjacent heat insulation modules are elastically connected. By means of the arrangement, gaps generated due to extremely-low-temperature shrinkage between the heat insulation modules can be reduced, the heat preservation performance is improved, the overall shrinkage amount of the heat insulation layer structure can be effectively reduced, the shrinkage amount of the heat insulation layer structure and the shrinkage amount of the main shielding layer tend to be the same, and the problem of excessive deformation or stress concentration of the main shielding layer is effectively avoided; effective protection on the main shielding layer is realized; in addition, the elastic connecting piece can effectively absorb and relieve stress caused by thermal shrinkage at the connecting position, and the connecting reliability and the long-term stability of the system are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied natural gas storage and transportation, and in particular to a thermal insulation layer structure and a film-type enclosure system. Background Art

[0002] With the growth of global demand for clean energy and the gradual reduction of traditional energy resources, natural gas, as an efficient and clean energy form, occupies an important position in the energy market. The storage technology of liquefied natural gas (LNG) has also made great progress. LNG storage tanks are containers used to store liquefied natural gas.

[0003] LNG storage tanks usually adopt a multi-layer structure design, among which the insulation layer is a key component to ensure the safe storage of LNG. The insulation layer is usually composed of multiple insulation modules, which need to be tightly connected to form an effective insulation barrier.

[0004] However, in the extremely low temperature environment of LNG (about -162℃), the insulation modules will experience significant thermal shrinkage. Excessive shrinkage of the insulation modules will, on the one hand, cause large gaps between the insulation modules, affecting the insulation effect, and on the other hand, may cause irregular deformation and stress concentration in the upper main shielding layer (usually a metal film), which not only affects the structural integrity and sealing performance of the main shielding layer, but also increases the risk of film cracking or rupture, affecting the safety and reliability of the system. Sometimes, rigid connections are used between insulation modules to limit the relative displacement between insulation modules. However, when the insulation modules shrink, excessive stress may be generated at the connection, increasing the risk of connection failure. In addition, rigid connections cannot effectively reduce the overall shrinkage deformation of the insulation layer. Summary of the invention

[0005] The present invention provides an insulation layer structure and a film-type enclosure system to solve the problem of excessive deformation or stress concentration of the main shielding layer caused by thermal contraction of the insulation module in the prior art, and can effectively reduce the stress problem of the insulation module caused by temperature changes, thereby improving the long-term reliability and stability of the system.

[0006] The present invention provides a heat insulation layer structure, comprising: a heat insulation module and an elastic connecting piece; The insulation modules are provided in plurality, and the plurality of insulation modules are spliced ​​with each other; The adjacent insulation modules are provided with corresponding connection points, and the two ends of the elastic connector are respectively connected to the corresponding connection points on the adjacent insulation modules, so that the adjacent insulation modules are elastically connected.

[0007] According to a heat insulation layer structure provided by the present invention, the elastic connecting member includes a spring, and the spring is made of low-temperature resistant material.

[0008] According to a thermal insulation layer structure provided by the present invention, the end of the elastic connecting member is hinged to the connecting point.

[0009] According to an insulation layer structure provided by the present invention, a connection seat is pre-buried in the side of the insulation module, the connection site is formed on the connection seat, and the connection seat is made of low-temperature resistant material.

[0010] According to a heat insulation layer structure provided by the present invention, the connection seat includes a base and a first hanging piece; the base is pre-buried in the side wall of the heat insulation module, and the first hanging piece is fixedly connected to the base; The end of the elastic connecting member is fixedly connected with a second hanging member, and the second hanging member is hooked and matched with the first hanging member to realize hinged connection.

[0011] According to a heat insulation layer structure provided by the present invention, one of the first hanging piece and the second hanging piece is configured as a hook, and the other is configured as a hanging ring.

[0012] According to a heat insulation layer structure provided by the present invention, the relative rotation angle range between the first hanger and the second hanger is ±15 degrees to ±20 degrees.

[0013] According to a heat insulation layer structure provided by the present invention, the material of the spring is selected from one of austenitic stainless steel, nickel-based alloy or titanium alloy.

[0014] According to a thermal insulation layer structure provided by the present invention, the connecting seat is made of 9% nickel steel; and / or the second hanger is made of stainless steel or titanium alloy.

[0015] According to a heat insulation layer structure provided by the present invention, the first connecting member is configured as a hook, and the second connecting member is configured as a hanging ring.

[0016] The present invention also provides a film-type enclosure system, comprising any one of the above-mentioned insulation layer structures.

[0017] The thermal insulation layer structure and film-type enclosure system provided by the present invention can realize elastic connection between thermal insulation modules through elastic connectors, reduce the gap between thermal insulation modules caused by extremely low temperature shrinkage, ensure the thermal insulation performance of the thermal insulation layer structure, and effectively reduce the overall shrinkage of the thermal insulation layer structure, so that the shrinkage of the thermal insulation layer structure tends to be the same as the shrinkage of the main shielding layer, thereby effectively avoiding the problem of excessive deformation or stress concentration of the main shielding layer caused by the different thermal shrinkage coefficients between the thermal insulation layer structure and the main shielding layer, achieving effective protection of the main shielding layer, and ensuring the safety and reliability of the system. In addition, while providing the necessary connection for adjacent thermal insulation modules, the elastic connector can effectively absorb and relieve the stress caused by thermal shrinkage at the connection, thereby better adapting to long-term temperature changes, ensuring the reliability of the connection and the long-term stability of the system, and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a top view of the insulation layer structure provided by an embodiment of the present invention.

[0020] Figure 2 This is one of the structural schematic diagrams of the cooperation between the insulation module and the elastic connector provided in the embodiment of the present invention.

[0021] Figure 3 This is the second structural schematic diagram of the cooperation between the insulation module and the elastic connector provided in the embodiment of the present invention.

[0022] Reference numerals: 10. Insulation module; 11. Elastic connector; 110. Second hanger; 12. Connecting seat; 120. Base; 121. First hanger; 20. Main shielding layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0024] In order to better understand the insulation layer structure and film-type enclosure system provided by the embodiments of the present invention, their application background is first introduced. As a container for storing and transporting liquefied natural gas, LNG storage tanks usually adopt a multi-layer structure design, in which the insulation layer is a key component to ensure the safe storage of LNG. The insulation layer is usually composed of multiple insulation modules, and these insulation modules need to be tightly connected to form an effective insulation barrier.

[0025] However, in the extremely low temperature environment of LNG (about -162°C), the insulation modules will experience significant thermal shrinkage. On the one hand, the excessive shrinkage of the insulation modules will cause larger gaps between the insulation modules, affecting the insulation effect. On the other hand, due to the different thermal shrinkage coefficients, the main shielding layer (usually the insulation layer is wood and the main shielding layer is a metal film) rigidly connected to the upper layer may produce irregular deformation and stress concentration, which not only affects the structural integrity and sealing performance of the main shielding layer, but also increases the risk of cracking or rupture of the film, affecting the safety and reliability of the system.

[0026] Sometimes, a rigid connection method is used between insulation modules to limit the relative displacement between the insulation modules. Although this method can reduce the gap between the insulation modules caused by thermal shrinkage, it may cause excessive stress at the connection, increasing the risk of connection failure. At the same time, the rigid connection method cannot effectively reduce the overall shrinkage deformation of the insulation layer, and it is also difficult to achieve effective protection for the main shielding layer.

[0027] In addition, during the long-term use of LNG storage tanks, the insulation layer needs to withstand repeated thermal cycles. The above connection method is difficult to adapt to long-term temperature changes, which may lead to a decrease in insulation performance or fatigue failure at the connection.

[0028] In view of the above problems, the embodiments of the present invention provide an insulation layer structure and a film-type enclosure system, which can effectively absorb and alleviate the stress caused by thermal contraction of the insulation module, thereby improving the long-term reliability and stability of the system.

[0029] Combine the following Figure 1-Figure 3 The thermal insulation layer structure and the membrane type enclosure system of the present invention are described.

[0030] Reference Figure 1 , an insulation layer structure, including an insulation module 10 and an elastic connector 11; wherein, a plurality of insulation modules 10 are provided, and the plurality of insulation modules 10 are spliced ​​with each other; adjacent insulation modules 10 are provided with corresponding connection sites, and the two ends of the elastic connector 11 are respectively connected to the corresponding connection sites on the adjacent insulation modules 10, so that the adjacent insulation modules 10 are elastically connected.

[0031] In practical applications, the elastic connector 11 can realize elastic connection between the insulation modules 10, reduce the gap between the insulation modules 10 caused by extremely low temperature shrinkage, ensure the thermal insulation performance of the insulation layer structure, and effectively reduce the overall shrinkage of the insulation layer structure, so that the shrinkage of the insulation layer structure tends to be the same as the shrinkage of the main shielding layer 20, thereby effectively avoiding the problem of excessive deformation or stress concentration of the main shielding layer 20 caused by the different thermal shrinkage coefficients between the insulation layer structure and the main shielding layer 20, achieving effective protection for the main shielding layer 20, and ensuring the safety and reliability of the system. In addition, while providing the necessary connection for adjacent insulation modules 10, the elastic connector 11 can effectively absorb and relieve the stress caused by thermal shrinkage at the connection, thereby better adapting to long-term temperature changes, ensuring the reliability of the connection and the long-term stability of the system, and is easy to install and maintain.

[0032] It should be pointed out that the specific shape and size of the insulation module 10 can be flexibly designed according to the shape, specification and layout of the actual insulation layer structure, and no specific restrictions are made in the embodiments of the present invention. In addition, the specific material and structure of the insulation module 10 can be set according to the actual insulation requirements, and can also refer to the insulation layer of the existing LNG storage tank. The main invention of the present invention lies in the connection structure between the insulation modules 10, rather than the material and structure of the insulation module 10 itself. Therefore, the specific material and structure of the insulation module 10 are not repeated in the embodiments of the present invention.

[0033] In some optional embodiments, the elastic connector 11 may be a spring, or any component or assembly having the same or similar function, as long as it can provide sufficient elastic force for the adjacent insulation modules 10. At the same time, in order to ensure that the elastic connector 11 can adapt to the extremely low temperature environment of LNG, the elastic connector 11 is made of a low temperature resistant material, so that the elastic connector 11 still has good elastic performance under extremely low temperature conditions.

[0034] In addition, the number, arrangement position, elastic force and other parameters of the elastic connectors 11 can be calculated and designed in combination with actual needs, such as the size of the insulation module 10, the expected shrinkage of the insulation module 10, etc., so that the elastic connectors 11 can provide appropriate compensation force when the insulation module 10 shrinks. In addition to reducing the gaps between the insulation modules 10 caused by shrinkage, the overall shrinkage of the insulation layer structure can be reduced, so that the shrinkage of the insulation layer structure tends to be the same as the shrinkage of the main shielding layer 20, thereby achieving effective protection of the main shielding layer 20. Since the parameters such as the size and material of the insulation module 10 are not specifically restricted in the embodiments of the present invention, the number, arrangement position, elastic force and other parameters of the elastic connectors 11 are also not specifically restricted.

[0035] In a specific embodiment of the present invention, the elastic connecting member 11 is a spring, and both ends of the spring are respectively connected to the connecting points at corresponding positions on two adjacent insulation modules 10 .

[0036] In order to ensure the strength and elastic properties of the spring in an extremely low temperature environment, in one embodiment of the present invention, the material of the spring can be selected from austenitic stainless steel (such as 304, 316 series), nickel-based alloy (such as Inconel 718, Hastelloy series) or titanium alloy (such as Ti-6Al-4V). These materials can still maintain good elasticity and strength at the extremely low temperature of LNG (about -162°C).

[0037] In addition, in order to improve the corrosion resistance and wear resistance of the spring, thereby improving its performance and extending its service life, the spring can also be surface treated, such as electroplating a metal protective layer on the surface of the spring or applying an anti-corrosion coating, etc. The specific details can be comprehensively considered in combination with actual application requirements and cost factors, and no specific restrictions are made in the embodiments of the present invention.

[0038] It is understandable that the spring includes but is not limited to the materials listed above, and other materials that can enable the spring to maintain the required strength and elastic properties in the LNG environment are also applicable.

[0039] In one embodiment of the present invention, the end of the elastic connector 11 is hinged to the connection point. In this way, the flexible connection of the spring allows a small relative movement between the insulation modules 10, which helps to release the internal stress caused by temperature changes, thereby protecting the main shielding layer 20, and the hinged connection design makes the relative displacement between the insulation modules 10 more flexible, ensuring that the spring can be maintained in the best working state under various working conditions, thereby further improving the protection effect and protecting the connection and the main shielding layer 20 from the threat of stress concentration.

[0040] According to different practical needs, there are a variety of feasible connection methods for the connection points between the spring and the insulation module 10.

[0041] In order to ensure the stability and convenience of the connection between the spring and the insulation module 10, in one embodiment of the present invention, a connection seat 12 is pre-buried in the side wall of the insulation module 10, and the above-mentioned connection site is formed on the connection seat 12, and the connection seat 12 is made of low-temperature resistant material. In this way, during the manufacturing process of the insulation module 10, by directly burying the connection seat 12 in its side wall, the firmness of the connection site can be ensured, thereby ensuring a firm connection between the elastic connector 11 and the insulation module 10.

[0042] Specifically, the connecting seat 12 includes a base 120 and a first hanger 121; wherein, the base 120 is connected to the side wall of the insulation module 10 by a pre-embedded manner, and its side portion is exposed to the side wall of the insulation module 10, and the first hanger 121 is fixedly connected to the portion of the base 120 exposed to the side wall of the insulation module 10; the end of the elastic connecting member 11 is fixedly connected to the second hanger 110, and the second hanger 110 and the first hanger 121 are hooked together to achieve hinged connection.

[0043] It should be noted that the specific parameters of the base 120, such as size, material, shape and embedded depth in the insulation module 10, can be designed according to actual needs, such as stability requirements, size and material parameters of the insulation module 10, etc. The first hanger 121 and the base 120 can be fixed by welding. Of course, in order to ensure structural strength, the two can also be formed in one piece.

[0044] In one embodiment of the present invention, the base 120 and the first hanger 121 are integrally formed, and the connecting seat 12 is made of 9% nickel steel or other low-temperature resistant metal. By pre-embedding the connecting seat 12 into the side wall of the insulation module 10, it is ensured that its strength matches that of the insulation module 10 under low temperature conditions.

[0045] In one embodiment of the present invention, in order to ensure the stability of the connection between the spring and the insulation module 10, the second hanger 110 is made of low-temperature resistant material, such as stainless steel or titanium alloy, etc. The specific material can be selected according to actual needs.

[0046] In some optional embodiments, the first hanging member 121 and the second hanging member 110 may use two hanging rings, and realize hinge connection by buckling the two hanging rings; or use two hooks, and realize hinge connection by hooking the two hooks; or one may use a hanging ring and the other may use a hook, and realize connection by hooking the hanging ring and the hook. The above-mentioned forms of the first hanging member 121 and the second hanging member 110 can be selected according to actual needs.

[0047] In one embodiment of the present invention, in order to facilitate the assembly of the spring and the insulation module 10 and the subsequent disassembly and maintenance, and to ensure the stable connection between the spring and the insulation module 10, one of the first hanging member 121 and the second hanging member 110 is a hook, and the other is a hanging ring. With such a configuration, when assembling the spring and the insulation module 10, the spring and the insulation module 10 can be easily assembled by simply hooking the hook with the hanging ring. When the spring is found to be ineffective or the hinge is stuck, the hook can be removed from the hanging ring, and the corresponding component can be replaced separately without dismantling the entire insulation module 10.

[0048] Specifically, the first hanging component 121 is a hanging ring, and the second hanging component 110 is a hook.

[0049] In one embodiment of the present invention, the relative rotation angle between the first hanging member 121 and the second hanging member 110 is in the range of ±15 degrees to ±20 degrees to accommodate small displacements caused by temperature changes and external loads.

[0050] It can be understood that the two interlocking annular structures can limit the relative rotation angle of the two annular structures by controlling the axial thickness of the annular structures. Therefore, the relative rotation angle range of the first hanger 121 and the second hanger 110 can be controlled within ±15 degrees to ±20 degrees by controlling the axial thickness of the first hanger 121 and / or the second hanger 110.

[0051] As a specific embodiment of the present invention, the spring is made of austenitic stainless steel 316L material, which can still maintain good elasticity and strength in an LNG environment at -162° C. The spring has a wire diameter of 3 mm, an outer diameter of 30 mm, a free length of 100 mm, and 10 effective turns.

[0052] The first hanger 121 is made of 9% nickel steel, has a length of 50 mm, and a cross-section of 10 mm×10 mm square. During the manufacturing process of the insulation module 10, the base 120 is directly buried in the side wall with a burial depth of 40 mm, and the exposed end 10 mm is used for connection with the spring.

[0053] The spring is connected to the first hanger 121 through the second hanger 110, which is made of 316L stainless steel and allows a rotation angle of ±15° to accommodate small displacements caused by temperature changes and external loads.

[0054] As another specific embodiment of the present invention, the spring is made of Inconel 718 nickel-based alloy to provide higher strength and corrosion resistance. The spring wire diameter is 3.5 mm, the outer diameter is 35 mm, the free length is 120 mm, and the effective number of coils is 12.

[0055] The first hanger 121 is made of the same 9% nickel steel, but the size is adjusted to 60 mm in length and 12 mm×12 mm in cross section, and the embedding depth of the base 120 is increased to 50 mm to provide a stronger connection strength.

[0056] The second pendant 110 is made of titanium alloy Ti-6Al-4V and allows a rotation angle of ±20°, further enhancing adaptability.

[0057] It is to be understood that, without mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification.

[0058] The film-type enclosure system provided by the present invention is described below. The film-type enclosure system described below and the thermal insulation layer structure described above can be referenced to each other.

[0059] A film-type enclosure system comprises the thermal insulation layer structure provided by any one of the above embodiments.

[0060] Through the insulation layer structure and film-type enclosure system provided by the embodiment of the present invention, the elastic connector 11 can realize the elastic connection between the insulation modules 10, reduce the gap between the insulation modules 10 caused by extremely low temperature shrinkage, ensure the thermal insulation performance of the insulation layer structure, and effectively reduce the overall shrinkage of the insulation layer structure, so that the shrinkage of the insulation layer structure tends to be the same as the shrinkage of the main shielding layer 20, thereby effectively avoiding the problem of excessive deformation or stress concentration of the main shielding layer 20 caused by the different thermal shrinkage coefficients between the insulation layer structure and the main shielding layer 20, achieving effective protection for the main shielding layer 20, and ensuring the safety and reliability of the system. In addition, while providing the necessary connection for adjacent insulation modules 10, the elastic connector 11 can effectively absorb and relieve the stress caused by thermal shrinkage at the connection, thereby better adapting to long-term temperature changes, ensuring the reliability of the connection and the long-term stability of the system, and is easy to install and maintain.

[0061] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal insulation layer structure, characterized in that: include: A heat insulation module (10) and an elastic connecting member (11); The thermal insulation modules (10) are provided in plurality, and the plurality of thermal insulation modules (10) are spliced ​​together; The adjacent insulation modules (10) are provided with corresponding connection points, and the two ends of the elastic connector (11) are respectively connected to the corresponding connection points on the adjacent insulation modules (10), so that the adjacent insulation modules (10) are elastically connected.

2. The thermal insulation layer structure according to claim 1, characterized in that: The elastic connecting member (11) comprises a spring, and the spring is made of a low-temperature resistant material.

3. The thermal insulation layer structure according to claim 2, characterized in that: The end of the elastic connecting member (11) is hinged to the connecting point.

4. The thermal insulation layer structure according to claim 3, characterized in that: A connection seat (12) is pre-buried on the side of the insulation module (10), the connection point is formed on the connection seat (12), and the connection seat (12) is made of low-temperature resistant material.

5. The thermal insulation layer structure according to claim 4, characterized in that: The connecting seat (12) comprises a base (120) and a first hanging member (121); the base (120) is pre-buried in the side wall of the insulation module (10), and the first hanging member (121) is fixedly connected to the base (120); The end of the elastic connecting member (11) is fixedly connected to a second hanging member (110), and the second hanging member (110) is hooked and matched with the first hanging member (121) to achieve hinged connection.

6. The thermal insulation layer structure according to claim 5, characterized in that: One of the first hanging piece (121) and the second hanging piece (110) is configured as a hook, and the other is configured as a hanging ring.

7. The thermal insulation layer structure according to claim 5, characterized in that: The relative rotation angle range between the first hanging piece (121) and the second hanging piece (110) is ±15 degrees to ±20 degrees.

8. The thermal insulation layer structure according to any one of claims 2 to 7, characterized in that: The material of the spring is selected from austenitic stainless steel, nickel-based alloy or titanium alloy.

9. The thermal insulation layer structure according to claim 5, characterized in that: The connecting seat (12) is made of 9% nickel steel; and / or the second hanging component (110) is made of stainless steel or titanium alloy.

10. A membrane type enclosure system, characterized in that: The invention comprises a heat insulating layer structure as claimed in any one of claims 1 to 9.

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