Liquid tank dome heat insulation system and installation method

Abstract

The invention belongs to the technical field of ship design, and provides a liquid tank dome heat insulation system and a mounting method.The system comprises a prefabricated heat insulation plate which comprises first to fifth prefabricated plates, the first to fourth prefabricated plates are laid on the outer side face of a liquid tank dome, and the fifth prefabricated plate is arranged on the outer surface of a liquid tank body; the fixing assembly is used for connecting the prefabricated heat insulation plate to the liquid cargo tank; the injection heat insulation layer is located in the dome cover plate of the hollow structure; and the spraying heat insulation layer is laid on the outer side face of the liquid tank dome and located between the prefabricated heat insulation plate and the dome cover plate. By means of the first to fifth prefabricated slabs and in cooperation with the injection heat insulation layer and the spraying heat insulation layer, the sealing performance and the heat insulation capacity of the heat insulation system in the dome area of the liquid cargo tank can be effectively improved, the heat insulation system adapts to various deformation of the liquid cargo tank in the working state, and the working stability of the heat insulation system is improved; the prefabricated heat insulation plates can be installed through the fixing assemblies, and the machining and installing difficulty of the heat insulation system is lowered.

Description

Technical Field

[0001] This application relates to the technical field of ship design, and particularly relates to a liquid tank dome thermal insulation system and an installation method thereof. Background Art

[0002] The liquid-tight shell used for loading cryogenic liquid cargo on a liquefied gas carrier is usually called a liquid cargo tank, simply referred to as a liquid tank. Liquid tanks can be divided into membrane type and independent type, and independent liquid tanks include type A, type B, and type C. Among them, the type B independent liquid tank has the advantages of a large liquid cargo carrying space, no limitation on the liquid cargo loading rate, a small daily evaporation rate of the liquid cargo, convenient installation, and easy maintenance, and has been applied to liquefied gas carriers such as those for transporting natural gas, liquefied ethane / ethylene, and fuel tanks of new energy ship types. According to different shapes, type B independent liquid tanks can be divided into prismatic tanks, square tanks, special-shaped tanks, spherical tanks, etc.

[0003] According to the design specifications of independent liquid cargo tanks, in order to limit the heat flow into the liquid cargo tank to a level that the pressure and temperature control system can maintain, it is necessary to set an insulating layer on the surface of the liquid cargo tank to control the temperature, pressure, and evaporation rate of the cryogenic liquid cargo in the liquid cargo tank at the design level. At present, two main thermal insulation system methods are adopted for type B independent liquid cargo tanks. One is the scheme of spraying an insulating layer on the surface of the liquid cargo tank, and the other is the scheme of installing prefabricated insulating panels on the surface of the liquid cargo tank. However, the type B independent liquid cargo tank deforms greatly during operation, and its structure is relatively complex. Especially in special areas such as the dome of the type B independent liquid cargo tank, a single form of thermal insulation system is difficult to meet the thermal insulation requirements of the type B independent liquid cargo tank, bringing potential safety hazards to the transportation of cryogenic liquid cargo. Summary of the Invention

[0004] The purpose of this application is to provide a liquid tank dome thermal insulation system, which is used to solve problems such as the existing thermal insulation system being unable to meet the thermal insulation requirements of the liquid cargo tank, and can effectively improve the thermal insulation effect of the thermal insulation system and adapt to various deformations of the liquid cargo tank during operation.

[0005] To achieve the above and other related purposes, this application provides a liquid tank dome thermal insulation system, including:

[0006] Prefabricated insulating panels, including a first prefabricated panel, a second prefabricated panel, a third prefabricated panel, a fourth prefabricated panel, and a fifth prefabricated panel. The first prefabricated panel is arranged on the outer side surface of the liquid tank dome, the second prefabricated panel is located in the first corner area where two adjacent outer side surfaces of the liquid tank dome intersect, the third prefabricated panel is located in the second corner area where the outer side surface of the liquid tank dome intersects with the outer surface of the liquid tank body, the fourth prefabricated panel is located in the third corner area where the first corner area intersects with the second corner area, and the fifth prefabricated panel is arranged on the outer surface of the liquid tank body;

[0007] Fixing components for connecting the prefabricated thermal insulation panel to the liquid cargo tank;

[0008] Injection thermal insulation layer located inside the dome cover plate of the hollow structure;

[0009] Sprayed thermal insulation layer laid on the outer side surface of the liquid tank dome and located between the prefabricated thermal insulation panel and the dome cover plate.

[0010] Optionally, the prefabricated thermal insulation panel includes an inner thermal insulation layer, an outer thermal insulation layer and a strengthening layer;

[0011] The inner thermal insulation layer is located on the outer surface of the liquid cargo tank. The side surface of the inner thermal insulation layer is covered with a first coating layer. A spacer is provided on the surface of the inner thermal insulation layer close to the liquid cargo tank, and a through leakage space is formed between the spacer and the liquid cargo tank;

[0012] The outer thermal insulation layer is located on the surface of the inner thermal insulation layer, and the size of the outer thermal insulation layer is smaller than that of the inner thermal insulation layer, so that a stepped structure is formed on the side surface of the prefabricated thermal insulation panel;

[0013] The strengthening layer is located between the inner thermal insulation layer and the outer thermal insulation layer.

[0014] Optionally, the fixing components are located in the joints between adjacent prefabricated thermal insulation panels, and the fixing components include:

[0015] U-shaped fixing parts located in the joints between adjacent inner thermal insulation layers. The top of the U-shaped fixing part has two flanges, and the flanges are located on the stepped surfaces of the stepped structure on the side surface of the prefabricated thermal insulation panel. An adiabatic plug block is arranged in the U-shaped space of the U-shaped fixing part;

[0016] Reinforcing structures located on the flanges of the U-shaped fixing part and respectively connected to the two flanges;

[0017] Fixed connection parts, including a fixing rod, a connecting rod and a fixing bolt. The fixing rod is connected to the liquid cargo tank. The connecting rod is located between the fixing rod and the U-shaped fixing part and is connected to the fixing rod. The fixing bolt is used to connect the connecting rod to the U-shaped fixing part.

[0018] Optionally, a first installation groove is provided at one end of the first prefabricated panel close to the dome cover plate, and a first installation hole is provided at the bottom of the first installation groove. The fixing components connect the first prefabricated panel to the liquid tank dome through the first installation groove and the first installation hole.

[0019] Optionally, the second prefabricated panel is a plate-like structure that is arcuately bent or linearly bent. One end of the second prefabricated panel close to the dome cover plate is provided with a second installation groove, and the bottom of the second installation groove is provided with a second installation hole. The fixing assembly connects the second prefabricated panel to the liquid tank dome through the second installation groove and the second installation hole.

[0020] Optionally, the liquid tank dome thermal insulation system further includes thermal insulation patches, which are located in the first installation groove of the first prefabricated panel or the second installation groove of the second prefabricated panel.

[0021] Optionally, the third prefabricated panel is a plate-like structure with a right-angle bend. The fourth prefabricated panel includes a vertical thermal insulation plate and a horizontal thermal insulation plate. The vertical thermal insulation plate is a plate-like structure that is arcuately bent or linearly bent and is vertically connected to the horizontal thermal insulation plate.

[0022] Optionally, the liquid tank dome thermal insulation system further includes:

[0023] Thermal insulation connection plates, which are located in the joints between adjacent prefabricated thermal insulation panels.

[0024] An outer protective layer, which is laid on the outer surfaces of the prefabricated thermal insulation panels and the sprayed thermal insulation layer.

[0025] The present application also provides an installation method for a liquid tank dome thermal insulation system, which is used to install any one of the liquid tank dome thermal insulation systems described in the above embodiments, and includes the following steps:

[0026] Obtain prefabricated thermal insulation panels and fixing components, wherein the prefabricated thermal insulation panels include a first prefabricated panel, a second prefabricated panel, a third prefabricated panel, a fourth prefabricated panel, and a fifth prefabricated panel;

[0027] Perform grid division and preset installation position positioning on the outer surface of the liquid cargo tank;

[0028] Connect the fixing rods in the fixing components to the preset installation positions;

[0029] According to the preset installation positions, install the fifth prefabricated panel on the outer surface of the liquid tank main body;

[0030] After completing the installation of the fifth prefabricated panel, sequentially install the fourth prefabricated panel, the third prefabricated panel, the second prefabricated panel, and the first prefabricated panel to the outer side of the liquid tank dome through the fixing components to complete the installation of the prefabricated thermal insulation panels;

[0031] Form a sprayed thermal insulation layer in the dome cover plate with a hollow structure;

[0032] Form a sprayed thermal insulation layer on the outer side of the liquid tank dome.

[0033] Optionally, the step of connecting the fixing rod in the fixing component to the preset installation position includes:

[0034] Grind and clean the preset installation position, where the grinding diameter is 20 mm to 30 mm;

[0035] Weld the fixing rod to the preset installation position, and make the coaxiality tolerance between the actual installation position of the fixing rod and the preset installation position not exceed 3 mm, and the included angle between the fixing rod and the outer surface of the liquid cargo tank is 87° to 93°.

[0036] Optionally, the liquid tank dome insulation system further includes insulation patches and insulation connection plates; after completing the installation of the prefabricated insulation board, the following steps are further included:

[0037] Install the insulation patches into the first installation groove of the first prefabricated board and the second installation groove of the second prefabricated board;

[0038] Install the insulation connection plates at the joints between adjacent prefabricated insulation boards.

[0039] Optionally, the dome cover has a filling space inside, and one side of the dome cover is provided with injection holes communicating with the filling space; the steps of forming an injection insulation layer in the dome cover include:

[0040] Inject a first material into the filling space through the injection holes to form the injection insulation layer in the filling space;

[0041] Grind the injection insulation layer so that the outer surface of the injection insulation layer at the injection holes is flush with the outer side surface of the dome cover.

[0042] Optionally, the steps of forming a spray insulation layer on the outer side surface of the liquid tank dome include:

[0043] Spray a second material on the outer side surface of the liquid tank dome to form a spray insulation layer, and make the spray insulation layer located between the prefabricated insulation board and the dome cover;

[0044] Grind the spray insulation layer so that the outer surface of the spray insulation layer is flush with the outer surface of the adjacent prefabricated insulation board.

[0045] Optionally, the liquid tank dome insulation system further includes an outer protective layer; after completing the steps of forming a spray insulation layer on the outer surface of the liquid tank dome, the following steps are further included:

[0046] An outer protective layer is laid on the outer surfaces of the prefabricated heat-insulating board and the sprayed heat-insulating layer, wherein the thickness of the outer protective layer is 0.5 mm to 1.5 mm.

[0047] As described above, compared with the prior art, the liquid tank dome heat-insulating system and the installation method provided by the present application have at least the following beneficial effects:

[0048] In the liquid tank dome heat-insulating system provided by the present application, through the first prefabricated board to the fifth prefabricated board, and in cooperation with the injection heat-insulating layer and the sprayed heat-insulating layer, the sealing performance and heat-insulating ability of the heat-insulating system in the dome area of the liquid cargo tank can be effectively improved, and the liquid tank dome heat-insulating system can adapt to various deformations of the liquid cargo tank under the working state, improving the working stability of the heat-insulating system; through the fixing assembly, the installation of various prefabricated heat-insulating boards can be realized, especially in the dome area of the liquid cargo tank with complex structure, effectively simplifying the installation process, improving the design efficiency of the heat-insulating system, and reducing the processing and installation difficulty of the heat-insulating system. The liquid tank dome heat-insulating system of the present application has the advantages of reliable structure, high integration degree, etc., can provide good heat-insulating function in a low-temperature environment, and improves the heat-insulating effect and working reliability of the system. The installation method of the present application is used to install the above-mentioned liquid tank dome heat-insulating system, so it also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 It shows a schematic structural diagram of a liquid tank dome heat-insulating system provided by Embodiment 1 of the present application.

[0051] Figure 2 It shows a schematic structural diagram of a liquid cargo tank provided by Embodiment 1 of the present application.

[0052] Figure 3 It shows a schematic structural diagram of the joint between adjacent prefabricated heat-insulating boards provided by Embodiment 1 of the present application.

[0053] Figure 4 It shows a schematic structural diagram of the U-shaped fixing part in the fixing assembly provided by Embodiment 1 of the present application.

[0054] Figure 5 and Figure 6 respectively show schematic structural diagrams of a first prefabricated board and a second prefabricated board provided by Embodiment 1 of the present application.

[0055] Figure 7 Shown is a cross-sectional structural diagram of a region near a spray-coated thermal insulation layer provided in Example 1 of the present application.

[0056] Figures 8 to 10 They respectively show the structural schematic diagrams of a third prefabricated board, a fifth prefabricated board and a fourth prefabricated board provided in the first embodiment of the present application.

[0057] Figure 11 Shown is a flow chart of a method for installing a liquid tank dome insulation system provided in Example 2 of the present application.

[0058] Reference numerals:

[0059] 11. Prefabricated insulation board; 101. First prefabricated board; 1011. First mounting groove; 1012. First mounting hole; 102. Second prefabricated board; 1021. Second mounting groove; 1022. Second mounting hole; 103. Third prefabricated board; 104. Fourth prefabricated board; 1041. Vertical insulation board; 1042. Horizontal insulation board; 105. Fifth prefabricated board; 111. Inner insulation layer; 1111. Pad; 112. Outer insulation layer; 113. Strengthening layer; 114. Insulation patch; 115 , first coating layer; 116, second coating layer; 12, fixing assembly; 121, U-shaped fixing piece; 1211, folded edge; 1212, insulation plug; 122, reinforcement structure; 123, fixed connection part; 1231, fixing rod; 1232, fixing bolt; 1233, connecting rod; 13, injection insulation layer; 14, spray insulation layer; 15, insulation connecting plate; 16, outer protective layer; 21, liquid tank body; 22, liquid tank dome; 221, dome cover; 2211, injection hole. DETAILED DESCRIPTION

[0060] In order to make the technical purpose, technical solution and technical effect of the present application clearer, the technical solution in the present application will be clearly and completely described in conjunction with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0063] In the description of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. In addition, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0064] Embodiment 1

[0065] This embodiment provides a liquid tank dome insulation system, which is installed in the dome area on the outer surface of the liquid cargo tank. The liquid cargo tank can be, for example, a Type B independent liquid cargo tank. The liquid cargo tank includes a liquid tank main body 21 and a liquid tank dome 22. The liquid tank dome 22 is located at the top of the liquid tank main body 21. A dome cover plate 221 is provided on the liquid tank dome 22 for covering the liquid tank dome 22. Among them, the dome area is the area on the outer surface of the liquid cargo tank close to the liquid tank dome 22 and the area where the liquid tank dome 22 is located.

[0066] Referring to Figure 1 and Figure 2 , the liquid tank dome insulation system of this embodiment includes a prefabricated insulation board 11, a fixing component 12, a sprayed insulation layer 13 and a painted insulation layer 14.

[0067] The prefabricated insulation board 11 includes a first prefabricated board 101, a second prefabricated board 102, a third prefabricated board 103, a fourth prefabricated board 104 and a fifth prefabricated board 105. The first prefabricated board 101 is arranged on the outer side surface of the liquid tank dome 22. The second prefabricated board 102 is located in the first corner area where two adjacent outer side surfaces of the liquid tank dome 22 intersect. The third prefabricated board 103 is located in the second corner area where the outer side surface of the liquid tank dome 22 intersects with the outer surface of the liquid tank main body 21. The fourth prefabricated board 104 is located in the third corner area where the first corner area and the second corner area intersect. The fifth prefabricated board 105 is arranged on the outer surface of the liquid tank main body 21.

[0068] Wherein, the first corner region is the edge region formed by the intersection of two adjacent outer side surfaces of the tank dome 22, the second corner region is the edge region formed by the intersection of the outer side surface of the tank dome 22 and the outer surface of the tank body 21, and the third corner region is the corner region at the intersection of the edge region of the outer side surface of the tank dome 22 and the outer surface of the tank body 21.

[0069] The fixing assembly 12 is used to connect the prefabricated insulation board 11 to the liquid cargo tank. The dome cover plate 221 is of a hollow structure. The injection insulation layer 13 is located inside the hollow structure of the dome cover plate 221. The sprayed insulation layer 14 is laid on the outer side surface of the tank dome 22 and is located between the prefabricated insulation board 11 and the dome cover plate 221.

[0070] After the liquid cargo tank is filled with cryogenic liquid cargo, by using the tank dome insulation system of this embodiment, a good insulation effect on the liquid cargo tank can be achieved, and the heat transfer between the external environment and the liquid cargo tank can be reduced. In the tank dome insulation system, through the first prefabricated board 101 to the fifth prefabricated board 105, and in cooperation with the injection insulation layer 13 and the sprayed insulation layer 14, the sealing performance and insulation ability of the insulation system in the tank dome area can be effectively improved, and the tank dome insulation system can adapt to various deformations of the liquid cargo tank in the working state, improving the working stability of the insulation system. Through the fixing assembly 12, the installation of each prefabricated insulation board 11 can be realized, especially in the area of the tank dome with a complex structure, effectively simplifying the installation process, improving the design efficiency of the insulation system, and reducing the processing and installation difficulty of the insulation system. Therefore, the tank dome insulation system of this embodiment has the advantages of reliable structure, high integration, etc., can provide good insulation function in a low-temperature environment, and effectively improves the insulation effect and working reliability of the system.

[0071] In this embodiment, referring to Figure 3 , the prefabricated insulation board 11 is a multi-layer structure, including an inner insulation layer 111, an outer insulation layer 112 and a strengthening layer 113. Among them, the first prefabricated board 101 to the fifth prefabricated board 105 can all adopt the above multi-layer structure.

[0072] The inner thermal insulation layer 111 is located on the outer surface of the liquid cargo tank, the outer thermal insulation layer 112 is located on the surface of the inner thermal insulation layer 111, and the size of the outer thermal insulation layer 112 is smaller than that of the inner thermal insulation layer 111, that is, the projection surface of the outer thermal insulation layer 112 on the outer surface of the inner thermal insulation layer 111 is located inside the outer surface of the inner thermal insulation layer 111, so that the side surface of the prefabricated thermal insulation board 11 forms a stepped structure. The strengthening layer 113 is located between the inner thermal insulation layer 111 and the outer thermal insulation layer 112, so that the inner thermal insulation layer 111 and the outer thermal insulation layer 112 are spaced apart. Optionally, the projection surface of the outer thermal insulation layer 112 on the outer surface of the strengthening layer 113 is completely located inside the outer surface of the strengthening layer 113. Further, the strengthening layer 113 completely covers the outer surface of the inner thermal insulation layer 111 on the side close to the outer thermal insulation layer 112.

[0073] The constituent materials of the inner thermal insulation layer 111 and the outer thermal insulation layer 112 include thermal insulation materials. The thermal insulation materials constituting the inner thermal insulation layer 111 and the outer thermal insulation layer 112 include, but are not limited to, one or more of materials such as polyurethane foam, polystyrene foam, polyethylene, phenolic foam, and aerogel. To improve the thermal insulation ability, mechanical strength, and flame retardancy ability of the inner thermal insulation layer 111 and the outer thermal insulation layer 112, the constituent materials of the inner thermal insulation layer 111 and the outer thermal insulation layer 112 may also include reinforcing materials. The reinforcing materials constituting the outer thermal insulation layer 112 include, but are not limited to, one or more of materials such as glass fiber and hollow glass microspheres. The constituent material of the strengthening layer 113 is a grid material. Optionally, the grid material constituting the strengthening layer 113 may be, for example, one or more of glass fiber aluminum foil grid cloth, carbon fiber grid cloth, metal mesh, or other suitable grid materials.

[0074] In an alternative embodiment, the inner thermal insulation layer 111, the outer thermal insulation layer 112, and the strengthening layer 113 are fixedly connected, for example, by bonding or other suitable means to fixedly connect the inner thermal insulation layer 111, the outer thermal insulation layer 112, and the strengthening layer 113. Optionally, the inner thermal insulation layer 111, the outer thermal insulation layer 112, and the strengthening layer 113 are bonded by a low-temperature adhesive. The low-temperature adhesive may be, for example, polyurethane glue, butyl glue, resin glue, or other suitable adhesives.

[0075] The inner thermal insulation layer 111 and the outer thermal insulation layer 112 of the prefabricated thermal insulation board 11 form a two-stage thermal insulation structure, which can improve the thermal insulation effect and service life of the liquid tank dome thermal insulation system. When the inner thermal insulation layer 111 undergoes a large deformation and cracks, since the strengthening layer 113 separates the inner thermal insulation layer 111 and the outer thermal insulation layer 112, it can reduce the stress transfer between the inner thermal insulation layer 111 and the outer thermal insulation layer 112, reduce the risk of the outer thermal insulation layer 112 cracking simultaneously, and can continuously maintain the thermal insulation effect of the system by means of the outer thermal insulation layer 112, improving the working reliability of the liquid tank dome thermal insulation system.

[0076] In this embodiment, referring to Figure 3, the liquid tank dome insulation system further includes a first cladding layer 115. The first cladding layer 115 is laid on the side surface of the inner insulation layer 111. During use, the first cladding layer 115 fills the gaps between adjacent inner insulation layers 111, providing a buffer space for the deformation between adjacent inner insulation layers 111, capable of alleviating the deformation caused by thermal expansion and contraction of the liquid cargo tank, and reducing the cracking risk brought by thermal expansion and contraction.

[0077] On the surface of the inner insulation layer 111 close to the liquid cargo tank, there is also a spacer 1111. A through leakage space is formed between the spacer 1111 and the liquid cargo tank. The leakage space serves as a leakage channel, enabling the cryogenic liquid cargo leaked after the failure of the liquid cargo tank to be collected at a preset position along this channel, for example, collected at the bottom of the liquid cargo tank, and the leakage of the cryogenic liquid cargo is led out by setting an outlet. The shape of the spacer 1111 can be a polygonal structure, or a hemispherical, semi-elliptical or other suitable structure.

[0078] In this embodiment, the fixing assembly 12 is located in the joint between adjacent prefabricated insulation boards 11. The fixing assembly 12 includes a U-shaped fixing member 121, a strengthening structure 122 and a fixing connection portion 123. Refer to Figure 3 and Figure 4 , the U-shaped fixing member 121 is located in the joint between adjacent inner insulation layers 111. The top of the U-shaped fixing member 121 has two flanges 1211, and the flanges 1211 are located on the step surfaces of the side step structures of the prefabricated insulation board 11. The strengthening structure 122 is located on the flanges 1211 of the U-shaped fixing member 121 and is respectively connected to the two flanges 1211. Optionally, the strengthening structure 122 is a plate-like structure and is fixedly connected to the two flanges 1211 respectively, for improving the structural stability of the U-shaped fixing member 121.

[0079] Refer to Figure 3 , the fixing connection portion 123 includes a fixing rod 1231, a connecting rod 1233 and a fixing bolt 1232. The fixing rod 1231 is connected to the liquid cargo tank. The connecting rod 1233 is located between the fixing rod 1231 and the U-shaped fixing member 121 and is connected to the fixing rod 1231. The fixing bolt 1232 is used to connect the connecting rod 1233 to the U-shaped fixing member 121, so that the fixing connection portion 123 is connected to the U-shaped fixing member 121, and further fixes the prefabricated insulation board 11 on the surface of the liquid cargo tank. The first cladding layer 115 fills the joint between adjacent inner insulation layers 111, thus maintaining good insulation effect of the overall insulation system.

[0080] In an alternative embodiment, the fixed rod 1231 is fixedly connected to the liquid cargo tank. The fixed rod 1231 can be fixed to the outer surface of the liquid cargo tank by welding or other suitable means. Threaded holes are provided at the upper and lower opposite ends of the connecting rod 1233. The fixed rod 1231 is a stud. The fixing bolt 1232 includes a nut and a stud. The nut is located at the bottom of the U-shaped space of the U-shaped fixing member 121. The stud of the fixing bolt 1232 passes through the U-shaped fixing member 121. The connecting rod 1233 is fixedly connected to the fixing bolt 1232 and the fixed rod 1231 respectively through the threaded holes.

[0081] Further, the connecting rod 1233 can be made of a material with a relatively low thermal conductivity, such as one or more of plastics, wood, composite materials, and other suitable materials, which can reduce the heat transfer between the liquid cargo tank and the fixing assembly 12 and improve the heat insulation effect of the heat insulation system.

[0082] In this embodiment, an insulating plug 1212 is provided in the U-shaped space of the U-shaped fixing member 121 to limit the deformation of the U-shaped fixing member 121 towards the center when stressed. At the same time, the insulating plug 1212 also fills the gap in the U-shaped fixing member 121, which helps to maintain a good heat insulation effect of the heat insulation system and prevent the generation of local cold spots.

[0083] In an alternative embodiment, referring to Figure 5 , the first prefabricated panel 101 is a rectangular plate-like structure. The side surface of the first prefabricated panel 101 adjacent to the dome cover plate is a flat structure, and the remaining side surfaces of the first prefabricated panel 101 are stepped structures. The folded edge 1211 of the U-shaped fixing member 121 is arranged on the stepped surface of the side surface of the first prefabricated panel 101 and is fixedly connected with the fixing connection part 123 to realize the installation of the first prefabricated panel 101. The first coating layer 115 is laid on the side surface of the inner heat insulation layer 111 of the first prefabricated panel 101, and the first coating layer 115 also covers the surface of the first prefabricated panel 101 adjacent to the dome cover plate, so that the sprayed heat insulation layer 14 is connected to the prefabricated heat insulation panel 11 through the first coating layer 115.

[0084] One end of the first prefabricated panel 101 adjacent to the dome cover plate 221 is further provided with a first installation groove 1011. A first installation hole 1012 is provided at the bottom of the first installation groove 1011. The bottom surface of the first installation groove 1011 and the first installation hole 1012 form a stepped structure. By arranging the U-shaped fixing member 121 and the fixing connection part 123 in the first installation hole 1012 and making the folded edge 1211 of the U-shaped fixing member 121 located on the stepped surface of the stepped structure and connecting to the outer side surface of the liquid tank dome 22, the installation and use of the first prefabricated panel 101 are realized.

[0085] In an alternative embodiment, referring to Figure 6, the second precast slab 102 is in an arc-shaped bent or straight-folded plate structure. The side of the second precast slab 102 close to the dome cover plate is a planar structure, and the remaining sides of the second precast slab 102 are stepped structures. The folded edge 1211 of the U-shaped fixing part 121 is located on the stepped surface of the side of the second precast slab 102, and cooperates with the fixed connection part 123 to realize the installation of the second precast slab 102. Refer to Figure 7 , a first coating layer 115 is laid on the side of the inner heat insulation layer 111 of the second precast slab 102, and the first coating layer 115 also covers the surface of the second precast slab 102 close to the dome cover plate, so that the sprayed heat insulation layer 14 is connected to the precast heat insulation board 11 through the first coating layer 115, which can improve the overall stability and reliability of the heat insulation system and facilitate the installation and maintenance of the precast heat insulation board 11.

[0086] One end of the second precast slab 102 close to the dome cover plate 221 is provided with a second installation groove 1021. The bottom of the second installation groove 1021 is provided with a second installation hole 1022. A stepped structure is formed between the bottom of the second installation groove 1021 and the second installation hole 1022. The second precast slab 102 can be connected to the liquid tank dome 22 through the stepped structure by the fixing assembly 12 to realize the installation and use of the second precast slab 102.

[0087] Furthermore, refer to Figure 1 , the liquid tank dome heat insulation system further includes a heat insulation patch 114. The heat insulation patch 114 is located in the first installation groove 1011 of the first precast slab 101 and / or the second installation groove 1021 of the second precast slab 102, and is used to ensure good heat insulation effect of the first precast slab 101 and the second precast slab 102. The material of the heat insulation patch 114 can be the same as that of the first precast slab 101 or the second precast slab 102, or can be made of one or more other suitable elastic heat insulation materials.

[0088] In an alternative embodiment, refer to Figure 8 , the shape of the third precast slab 103 matches the shape of the second corner area. The third precast slab 103 can be, for example, a plate structure with a right-angle fold. When the third precast slab 103 is viewed from the side, the third precast slab 103 is an L-shaped structure, so that the third precast slab 103 can be laid in the second corner area. Refer to Figure 9 , the fifth precast slab 105 can be a rectangular, triangular or other suitable polygonal plate structure, and is used to lay the planar area on the outer surface of the liquid tank body 21. The sides of the third precast slab 103 and the fifth precast slab 105 are both formed with stepped structures, and the third precast slab 103 and the fifth precast slab 105 can be connected to the liquid cargo tank through the fixing assembly 12 to realize the installation and use of the third precast slab 103 and the fifth precast slab 105.

[0089] In an alternative embodiment, refer to Figure 10, the fourth prefabricated panel 104 includes a vertical insulation panel 1041 and a horizontal insulation panel 1042. The vertical insulation panel 1041 is in the form of an arc-bent or straight-bent plate structure and is connected to the horizontal insulation panel 1042. Further, the vertical insulation panel 1041 is vertically connected to the horizontal insulation panel 1042. The inner surface of the concave side of the vertical insulation panel 1041 is laid on the outer side surface of the liquid tank dome 22, and the inner surface of the horizontal insulation panel 1042 is laid on the outer surface of the liquid tank main body 21, so that the fourth prefabricated panel 104 is laid in the third corner area. A stepped structure is formed on the side surface of the fourth prefabricated panel 104, and the fourth prefabricated panel 104 can be connected to the liquid cargo tank through the fixing component 12 to realize the installation and use of the fourth prefabricated panel 104.

[0090] In this embodiment, referring to Figure 1 and Figure 7 , the dome cover plate 221 is of a hollow structure. There is a filling space inside the hollow dome cover plate 221. The spray insulation layer 13 is located in the filling space of the dome cover plate 221. The constituent material of the spray insulation layer 13 is the first material, and the first material is an insulation material. The first material can be, for example, polyurethane foam or other suitable materials. Optionally, a spray hole 2211 is provided on one side of the dome cover plate 221. The spray hole 2211 communicates with the filling space, and the first material is sprayed into the filling space through the spray hole 2211 to form the spray insulation layer 13 in the filling space.

[0091] In this embodiment, referring to Figure 1 , the spray coating insulation layer 14 is located between the prefabricated insulation panel 11 and the dome cover plate 221 and is laid on the outer side surface of the liquid tank dome 22. The two opposite ends of the spray coating insulation are respectively connected to the prefabricated insulation panel 11 and the dome cover plate 221. The constituent material of the spray coating insulation layer 14 is the second material, and the second material is an insulation material. The second material can be, for example, polyurethane foam or other suitable materials.

[0092] In this embodiment, the liquid tank dome thermal insulation system further includes a thermal insulation connecting plate 15, and the thermal insulation connecting plate 15 is located in the joint between adjacent prefabricated thermal insulation plates 11. Specifically, the thermal insulation connecting plate 15 is located in the joint between two adjacent outer thermal insulation layers 112. The thermal insulation connecting plate 15 is provided in the joints between the first prefabricated plate 101, the second prefabricated plate 102, the third prefabricated plate 103, the fourth prefabricated plate 104, and the fifth prefabricated plate 105, and is used to fill the gap between adjacent outer thermal insulation layers 112, achieve a sealing effect, ensure that the liquid tank dome thermal insulation system has a good thermal insulation effect, and at the same time provide a buffer space for the deformation between the outer thermal insulation plates, reducing the risk of cracking of the outer thermal insulation plates. The constituent material of the thermal insulation connecting plate 15 can be an elastic thermal insulation material, and the elastic thermal insulation material constituting the thermal insulation connecting plate 15 can include, for example, one or more of glass wool, polyurethane foam, melamine foam, ethylene-vinyl acetate copolymer foam, polyethylene foam, polypropylene foam, polyimide foam, or other suitable materials.

[0093] In an alternative embodiment, referring to Figure 3 , the liquid tank dome thermal insulation system further includes a second coating layer 116, and the second coating layer 116 is coated on the side surface of the outer thermal insulation layer 112. During use, the second coating layer 116 fills the space between the outer thermal insulation layer 112 and the thermal insulation connecting plate 15, and the second coating layer 116 can be made of the same material as the first coating layer 115. Through the second coating layer 116 and the thermal insulation connecting plate 15, the gap between adjacent outer thermal insulation layers 112 is filled to achieve a sealing effect, thereby ensuring that the thermal insulation system has a good thermal insulation effect.

[0094] In this embodiment, referring to Figure 1 and Figure 3 , the liquid tank dome thermal insulation system further includes an outer protective layer 16, and the outer protective layer 16 is laid on the outer surfaces of the prefabricated thermal insulation plate 11 and the sprayed thermal insulation layer 14. The material of the outer protective layer 16 can be a thermoplastic polyolefin elastomer or made of other suitable materials. The constituent material of the outer protective layer 16 can be, for example, one or more of polyolefin resin materials such as polypropylene and polyethylene, or other suitable materials. The outer protective layer 16 has a preset strength and thickness, and covers the prefabricated thermal insulation plate 11, the sprayed thermal insulation layer 14, the injection hole 2211, and the thermal insulation patch 114, and can provide good mechanical protection and anti-aging protection.

[0095] Embodiment 2

[0096] This embodiment provides an installation method for a liquid tank dome thermal insulation system, which is used to install any one of the liquid tank dome thermal insulation systems in Embodiment 1. Using the installation method of this embodiment, the liquid tank dome thermal insulation system can be installed on the dome area of the outer surface of the liquid cargo tank to achieve the thermal insulation effect of the dome area of the liquid cargo tank.

[0097] Referring to Figure 11, the installation method of this embodiment includes steps S1 to S7, specifically including:

[0098] S1. Obtain the prefabricated insulation board 11 and the fixing component 12. Among them, the prefabricated insulation board 11 includes the first prefabricated board 101, the second prefabricated board 102, the third prefabricated board 103, the fourth prefabricated board 104, and the fifth prefabricated board 105;

[0099] S2. Perform mesh division and positioning of the preset installation positions on the outer surface of the liquid cargo tank;

[0100] S3. Connect the fixing rod 1231 in the fixing component 12 to the preset installation position;

[0101] S4. According to the preset installation position, install the fifth prefabricated board 105 on the outer surface of the liquid tank main body 21;

[0102] S5. After completing the installation of the fifth prefabricated board 105, sequentially install the fourth prefabricated board 104, the third prefabricated board 103, the second prefabricated board 102, and the first prefabricated board 101 on the outer side of the liquid tank dome 22 through the fixing component 12 to complete the installation of the prefabricated insulation board 11;

[0103] S6. Form a spray insulation layer 13 inside the dome cover plate 221 with a hollow structure;

[0104] S7. Form a sprayed insulation layer 14 on the outer side of the liquid tank dome 22.

[0105] In step S1, the fixing component 12 includes a U-shaped fixing part 121, a strengthening structure 122, and a fixing connection part 123. The fixing connection part 123 includes a fixing rod 1231, a connecting rod, and a fixing bolt 1232. According to the design requirements, the production and processing of the fixing component 12 and the first prefabricated board 101 to the fifth prefabricated board 105 are completed to obtain the prefabricated insulation board 11 and the fixing component 12.

[0106] In step S2, according to the design requirements, the mesh division of the outer surface of the liquid cargo tank is completed to determine the installation area of each prefabricated insulation board 11, and based on the result of the mesh division, the preset installation positions are positioned. Among them, the preset installation position is the installation position of the fixing rod 1231 in the fixing component 12 on the outer surface of the liquid cargo tank.

[0107] In step S3, the fixing rod 1231 can be connected to the preset installation position of the liquid cargo tank by welding or other suitable means. Optionally, performing step S3 may include the following steps: grinding and cleaning the preset installation position; welding the fixing rod 1231 to the preset installation position, and making the coaxiality tolerance between the actual installation position of the fixing rod 1231 and the preset installation position not exceed 3 mm, and the angle between the fixing rod 1231 and the outer surface of the liquid cargo tank is 87° - 93°. Further, in the step of grinding and cleaning the preset installation position, the grinding diameter is 20 mm - 30 mm.

[0108] In this embodiment, after completing step S3, step S4 is performed to lay the fifth prefabricated panel 105 on the outer surface of the liquid tank body 21, and the fixing assembly 12 is used to fix the fifth prefabricated panel 105 on the surface of the liquid cargo tank. When the fifth prefabricated panel 105 is laid to the area near the bottom of the dome, step S5 is performed to sequentially install the fourth prefabricated panel 104, the third prefabricated panel 103, the second prefabricated panel 102, and the first prefabricated panel 101, and the fixing assembly 12 is used to fix the fourth prefabricated panel 104 to the first prefabricated panel 101 on the outer side of the liquid tank dome 22. Among them, by controlling the installation sequence of the first prefabricated panel 101 to the fifth prefabricated panel 105, it is possible to help reduce the installation difficulty and improve the installation efficiency and quality.

[0109] In this embodiment, the liquid tank dome thermal insulation system further includes a thermal insulation patch 114 and a thermal insulation connecting plate 15. After completing the installation of the prefabricated thermal insulation panel 11 in step 4, the following steps are further included: installing the thermal insulation patch 114 into the first installation groove 1011 of the first prefabricated panel 101 and the second installation groove 1021 of the second prefabricated panel 102; installing the thermal insulation connecting plate 15 at the joint between adjacent prefabricated thermal insulation panels 11.

[0110] In an alternative embodiment, the dome cover 221 has a filling space, and a jet hole 2211 is provided on one side of the dome cover 221. The steps of performing step S6 may include: injecting a first material into the filling space through the jet hole 2211 to form a jet thermal insulation layer 13 in the filling space; grinding the jet thermal insulation layer 13 so that the outer surface of the jet thermal insulation layer 13 at the jet hole 2211 is flush with the outer side surface of the dome cover 221. Among them, the first material can be, for example, polyurethane foam or other suitable materials.

[0111] In an alternative embodiment, the steps of performing step S7 may include: spraying a second material on the outer side surface of the liquid tank dome 22 to form a sprayed thermal insulation layer 14, and making the sprayed thermal insulation layer 14 located between the prefabricated thermal insulation board 11 and the dome cover plate 221, and being in contact with the prefabricated thermal insulation board 11 and the dome cover plate 221 respectively; grinding the sprayed thermal insulation layer 14 to make the outer surface of the sprayed thermal insulation layer 14 flush with the outer surface of the adjacent prefabricated thermal insulation board 11. Wherein, the second material may be, for example, polyurethane foam or other suitable materials.

[0112] In this embodiment, the liquid tank dome thermal insulation system may further include an outer protective layer 16. After performing the step of forming the sprayed thermal insulation layer 14 on the outer surface of the liquid tank dome 22 in step S7, the following steps may further be included: laying the outer protective layer 16 on the outer surfaces of the prefabricated thermal insulation board 11 and the sprayed thermal insulation layer 14, wherein the thickness of the outer protective layer 16 is 0.5 mm to 1.5 mm. Optionally, in the step of laying and forming the outer protective layer 16, the overlapping length of the outer protective layer 16 at the joint is not less than 200 mm, and the outer protective layer 16 also covers the thermal insulation connecting plate 15 and the injection hole 2211. Since the structure of the liquid tank dome area is relatively complex, laying the outer protective layer 16 after performing step S7 and making it cover the outer surfaces of the prefabricated thermal insulation board 11, the sprayed thermal insulation layer 14 and the thermal insulation connecting plate 15 can reduce the production difficulty of the outer protective layer, simplify the manufacturing process of the outer protective layer, and improve the design efficiency, production efficiency and installation efficiency of the thermal insulation system.

[0113] The material of the outer protective layer 16 may be thermoplastic polyolefin elastomer, or may also be made of other suitable materials. The constituent materials of the outer protective layer 16 may be, for example, one or more of polyolefin resin materials such as polypropylene and polyethylene or other suitable materials. Optionally, when the material of the outer protective layer 16 is thermoplastic polyolefin elastomer, the outer protective layer 16 may be formed by laying a sheet made of thermoplastic polyolefin elastomer on the outer surfaces of the prefabricated thermal insulation board 11 and the sprayed thermal insulation layer 14; or the outer protective layer 16 may also be formed by spraying a thermoplastic polyolefin elastomer material on the outer surfaces of the prefabricated thermal insulation board 11 and the sprayed thermal insulation layer 14.

[0114] The installation method of this embodiment is used to install any one of the liquid tank dome thermal insulation systems in Embodiment 1 to the outer surface of the liquid cargo tank. Therefore, the installation method of this embodiment also has the beneficial effects of Embodiment 1; and based on the installation method of this embodiment, by covering the flat area of the outer surface of the liquid cargo tank with the fifth prefabricated board 105, the overall thermal insulation effect of the liquid cargo tank can also be achieved.

[0115] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Any person familiar with this technology can modify, change or combine the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present application should still be covered by the claims of the present application.

Claims

1. A liquid tank dome insulation system, characterized in that, Comprising: Prefabricated insulation panels, including a first prefabricated panel, a second prefabricated panel, a third prefabricated panel, a fourth prefabricated panel and a fifth prefabricated panel. The first prefabricated panel is disposed on the outer side surface of the tank dome. The second prefabricated panel is located in a first corner area where two adjacent outer side surfaces of the tank dome intersect. The third prefabricated panel is located in a second corner area where the outer side surface of the tank dome intersects with the outer surface of the tank body. The fourth prefabricated panel is located in a third corner area where the first corner area intersects with the second corner area. The fifth prefabricated panel is disposed on the outer surface of the tank body; Fixing components for connecting the prefabricated insulation panels to the liquid cargo tank; Injected insulation layer located inside the dome cover of the hollow structure; Sprayed insulation layer laid on the outer side surface of the tank dome and located between the prefabricated insulation panel and the dome cover.

2. The liquid tank dome thermal insulation system according to claim 1, wherein The prefabricated insulation panel includes an inner insulation layer, an outer insulation layer and a reinforcement layer; The inner insulation layer is located on the outer surface of the liquid cargo tank. A first coating layer covers the side surface of the inner insulation layer. Spacers are provided on the surface of the inner insulation layer close to the liquid cargo tank side. A through leakage space is formed between the spacers and the liquid cargo tank; The outer insulation layer is located on the surface of the inner insulation layer, and the size of the outer insulation layer is smaller than that of the inner insulation layer, so that a stepped structure is formed on the side surface of the prefabricated insulation panel; The reinforcement layer is located between the inner insulation layer and the outer insulation layer.

3. The liquid tank dome thermal insulation system according to claim 2, characterized in that, The fixing components are located in the joints between adjacent prefabricated insulation panels. The fixing components include: A U-shaped fixing member located in the joint between adjacent inner insulation layers. The top of the U-shaped fixing member has two flanges, and the flanges are located on the stepped surfaces of the stepped structure on the side surface of the prefabricated insulation panel. An insulation plug block is provided in the U-shaped space of the U-shaped fixing member; Reinforcing structures located on the flanges of the U-shaped fixing member and respectively connected to the two flanges; A fixed connection part, including a fixed rod, a connecting rod and a fixing bolt. The fixed rod is connected to the liquid cargo tank. The connecting rod is located between the fixed rod and the U-shaped fixing member and is connected to the fixed rod. The fixing bolt is used to connect the connecting rod to the U-shaped fixing member.

4. The liquid tank dome thermal insulation system according to claim 1, characterized in that, One end of the first prefabricated panel close to the dome cover is provided with a first installation groove, and a first installation hole is provided at the bottom of the first installation groove. The fixing components connect the first prefabricated panel to the tank dome through the first installation groove and the first installation hole.

5. The liquid tank dome insulation system according to claim 1, characterized in that, The second prefabricated panel is in an arc-shaped bent or straight-bent plate-like structure. One end of the second prefabricated panel close to the dome cover is provided with a second installation groove, and a second installation hole is provided at the bottom of the second installation groove. The fixing components connect the second prefabricated panel to the tank dome through the second installation groove and the second installation hole.

6. The liquid tank dome insulation system according to claim 4 or 5, characterized in that, An insulation patch block is further included and is located in the first installation groove of the first prefabricated panel or the second installation groove of the second prefabricated panel.

7. The liquid tank dome thermal insulation system according to claim 1, wherein, The third precast slab is a plate-like structure with a right-angled bend. The fourth precast slab includes a vertical insulation slab and a horizontal insulation slab. The vertical insulation slab is a plate-like structure with an arc-shaped bend or a straight bend, and is vertically connected to the horizontal insulation slab.

8. The liquid tank dome insulation system according to claim 1, wherein It further includes: An insulation connecting plate located within the joint between adjacent precast insulation slabs. An outer protective layer laid on the outer surfaces of the precast insulation slabs and the sprayed insulation layer.

9. A method for installing a liquid tank dome insulation system, for installing the liquid tank dome insulation system according to any one of claims 1 to 8, characterized in that, It includes the following steps: Obtain precast insulation slabs and fixing components, where the precast insulation slabs include a first precast slab, a second precast slab, a third precast slab, a fourth precast slab, and a fifth precast slab; Perform mesh division and positioning of the preset installation positions on the outer surface of the liquid cargo tank; Connect the fixing rods in the fixing components to the preset installation positions; Install the fifth precast slab on the outer surface of the liquid tank main body according to the preset installation positions; After completing the installation of the fifth precast slab, sequentially install the fourth precast slab, the third precast slab, the second precast slab, and the first precast slab to the outer side of the liquid tank dome through the fixing components to complete the installation of the precast insulation slabs; Form a sprayed insulation layer within the hollow dome cover plate; Form a sprayed insulation layer on the outer side of the liquid tank dome.

10. The installation method of the liquid tank dome thermal insulation system according to claim 9, characterized in that, Performing the step of connecting the fixing rods in the fixing components to the preset installation positions includes: Grind and clean the preset installation positions, where the grinding diameter is 20 mm to 30 mm; Weld the fixing rods to the preset installation positions, and make the coaxiality tolerance between the actual installation positions of the fixing rods and the preset installation positions not exceed 3 mm, and the angle between the fixing rods and the outer surface of the liquid cargo tank is 87° to 93°.

11. The installation method of the liquid tank dome thermal insulation system according to claim 9, characterized in that, The liquid tank dome insulation system further includes insulation patches and insulation connecting plates; after completing the installation of the precast insulation slabs, it further includes the following steps: Install the insulation patches into the first installation grooves of the first precast slab and the second installation grooves of the second precast slab; Install the insulation connecting plates at the joints between adjacent precast insulation slabs.

12. The liquid tank dome thermal insulation system according to claim 9, characterized in that, The dome cover plate has a filling space, and one side of the dome cover plate is provided with an injection hole communicating with the filling space; Performing the step of forming a sprayed insulation layer within the dome cover plate includes: Inject a first material into the filling space through the injection hole to form the sprayed insulation layer within the filling space; Grind the sprayed insulation layer so that the outer surface of the sprayed insulation layer at the injection hole is flush with the outer side surface of the dome cover plate.

13. The liquid tank dome thermal insulation system according to claim 9, characterized in that, Performing the step of forming a sprayed insulation layer on the outer side of the liquid tank dome includes: Spray a second material on the outer side of the liquid tank dome to form a sprayed insulation layer, and make the sprayed insulation layer located between the precast insulation slabs and the dome cover plate; Grind the sprayed insulation layer so that the outer surface of the sprayed insulation layer is flush with the outer surfaces of the adjacent precast insulation slabs.

14. The installation method of the liquid tank dome thermal insulation system according to claim 9, characterized in that, The liquid tank dome insulation system further includes an outer protective layer; after performing the step of forming a sprayed insulation layer on the outer surface of the liquid tank dome, it further includes the following steps: An outer protective layer is laid on the outer surfaces of the prefabricated heat-insulating board and the sprayed heat-insulating layer, wherein the thickness of the outer protective layer is 0.5 mm to 1.5 mm.

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