Heat-insulating system of b-type independent liquid tank, and ship

Abstract

Provided in the present application are a heat-insulating system of a B-type independent liquid tank, and a ship. The heat-insulating system comprises: prefabricated heat-insulating plates arranged on the outer surface of a liquid tank, wherein the side surface of each prefabricated heat-insulating plate is of a step shape; fixing assemblies arranged at joints of the prefabricated heat-insulating plates, wherein each fixing assembly comprises a fixing column and a U-shaped fixing member, two flanges are provided at the top of each U-shaped fixing member, the flanges are arranged on the stepped side surfaces of the prefabricated heat-insulating plates, and each joint between inner heat-insulating layers is filled with an elastic heat-insulating joint-filling material; heat-insulating plug blocks, U-shaped areas of the U-shaped fixing members being filled therewith; joint heat-insulating plates, each of which is arranged in a joint between adjacent outer heat-insulating layers, each joint heat-insulating plate being connected to the prefabricated heat-insulating plates, an extending overlap layer, the U-shaped fixing member and the heat-insulating plug block; and joint protection layers, each of which is laid on the upper surface of a joint between two adjacent prefabricated heat-insulating plates. The present application simplifies the product structure, shortens the design period, simplifies the mounting process, and reduces costs.

Description

A thermal insulation system for a B-type independent liquid tank and a ship Technical Field

[0001] The present application relates to the technical field of liquefied gas ships, and in particular to a thermal insulation system of a type B independent liquid tank and a ship. Background Art

[0002] The liquid-tight hull used to carry cryogenic liquid cargo on liquefied natural gas carriers is called a cargo tank, or simply a tank. Tanks come in two types: membrane and independent. Independent tanks include Types A, B, and C. Type B independent tanks have long been used for transporting liquefied natural gas (LNG) due to their large capacity, low daily evaporation, and ease of installation and maintenance. Type B independent tanks are unique in structure, and their insulation system differs from the more technologically mature membrane tanks. Due to their complex structure, Type B independent tanks experience significant deformation during operation. Plate insulation systems theoretically possess higher strength, and therefore, the insulation system currently used for Type B independent tanks is primarily based on prefabricated insulation panels installed on the tank surface. However, existing prefabricated insulation panels are complex in appearance and structure, requiring a long initial design cycle (2-3 months), requiring dedicated production lines for manufacturing, resulting in significant investment, and complex installation processes. Consequently, the actual performance of plate insulation systems often differs significantly from the theoretical design.

[0003] Therefore, it is urgent to propose an effective and suitable insulation system for type B independent liquid tanks.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide an insulation system and ship for a Type B independent liquid tank, which solves the technical problems of the existing insulation system, such as complex structure, long design cycle, and complex installation process, which often lead to large differences between the actual effect and the theoretical design.

[0006] In a first aspect, a thermal insulation system for a type B independent tank is provided, comprising:

[0007] A prefabricated insulation panel is arranged on the outer surface of the liquid tank, the side surface of the prefabricated insulation panel is stepped, and the prefabricated insulation panel includes an inner insulation layer, an outer insulation layer, and a reinforcement layer. The outer insulation layer is arranged on the surface of the inner insulation layer and is smaller than the inner insulation layer. The reinforcement layer is provided on the interface between the inner insulation layer and the outer insulation layer and extends out of the prefabricated insulation panel. The reinforcement layer forms an extended overlapping layer at the joint between two adjacent prefabricated insulation panels.

[0008] A fixing assembly is arranged at the joint of the prefabricated insulation board, the fixing assembly includes a fixing column and a U-shaped fixing piece, the lower end of the fixing column is arranged at a predetermined position on the outer surface of the liquid tank, the U-shaped fixing piece is arranged between the inner insulation layers, the bottom of the U-shaped fixing piece is fixed to the upper end of the fixing column, the top of the U-shaped fixing piece is provided with two folded edges, the folded edges are placed on the stepped side of the prefabricated insulation board, and the joint between the inner insulation layers is filled with elastic insulation caulking material;

[0009] an insulating plug, which is arranged in the U-shaped area of ​​the U-shaped fixing piece, and the space between the bottom of the insulating plug and the bottom of the U-shaped fixing piece is filled with a filler;

[0010] a joint insulation panel, arranged in the joint between adjacent outer insulation layers, the joint insulation panel connecting the prefabricated insulation panels, the extended overlapping layers, the U-shaped fixing members and the insulation plugs; the gap between the joint insulation panel and the outer insulation layer is filled with a foamed caulking material;

[0011] The joint protection layer is applied on the upper surface of the joint between two adjacent prefabricated insulation panels.

[0012] In one embodiment, the prefabricated insulation panels in two adjacent rows are staggered, and the fixing components are arranged at a preset distance at the joints of the three prefabricated insulation panels, wherein one folded edge of the U-shaped fixing member is placed on the stepped sides of the two prefabricated insulation panels at the same time.

[0013] In one embodiment, it also includes a splash shield plate, which is arranged on the outer surface of the liquid tank, and the prefabricated insulation board is arranged on the splash shield plate. The inner surface of the splash shield plate is provided with a protruding structure, and a through annular space is formed between the protruding structure and the liquid tank. The outer surface of the splash shield plate is provided with a metal layer.

[0014] In one embodiment, the fixing assembly further includes a first stud, the bottom of which is fixedly connected to the outer surface of the liquid tank, the lower end of the fixing column is connected to the top of the first stud, and the lower end of the fixing column presses and fixes the splash shield plate.

[0015] In one embodiment, it also includes a gas purge device arranged in the annular space, the splash shield plate covers the gas purge device, and the gas purge device includes a plurality of fixing components and a gas purge pipe; the plurality of fixing components are fixed at preset positions on the outer surface of the liquid tank along a preset airflow direction, each of the fixing components includes a fixing clamp and two second studs, the two second studs are symmetrically fixed on the outer surface of the liquid tank, the fixing clamp is provided with a clamping portion and two connecting portions distributed on both sides of the clamping portion, and one connecting portion is connected to one second stud; the gas purge pipe is provided below the clamping portion of the fixing clamp, and the gas purge pipe is provided with a plurality of air holes for discharging gas.

[0016] In one embodiment, the inner insulation layer, the outer insulation layer and the reinforcement layer are bonded by an adhesive, the extended overlapping layer of the reinforcement layer is arranged above the U-shaped fixing member, and the reinforcement layer is composed of one or more grid-like materials, and the grid-like materials include glass fiber mesh cloth, carbon fiber mesh cloth and metal mesh.

[0017] In one embodiment, an elastic thermal insulation layer is provided between the splash barrier plate and the prefabricated thermal insulation panel, and the elastic thermal insulation layer is made of an elastic thermal insulation material.

[0018] In one embodiment, there are multiple splash-proof barrier plates, the interior of the joint between two adjacent splash-proof barrier plates is filled with insulating plugs, and the upper surface of the joint is provided with a flexible liquid-tight material, which includes glass fiber aluminum foil cloth, carbon fiber aluminum foil cloth and composite materials.

[0019] In one embodiment, the prefabricated insulation panel further comprises an outer protective layer disposed on the outer surface thereof, wherein the material of the outer protective layer has a predetermined strength and includes polymer, glass fiber reinforced plastic and metal materials.

[0020] In one embodiment, an adhesive is provided on the bottom of the seam insulation panel, and the seam insulation panel is connected to the prefabricated insulation panel, the extended overlapping layer, the U-shaped fixing member and the insulation plug block by the adhesive; the seam between the side surface of the seam insulation panel and the side surface of the prefabricated insulation panel is filled with polyurethane foam.

[0021] According to a second aspect of the present application, a ship is further provided, comprising the insulation system of the type B independent liquid tank as described in any embodiment of the first aspect.

[0022] The insulation system of the type B independent tank in this application has the following beneficial effects:

[0023] By optimizing the design of prefabricated insulation panels and using fixed components to secure them, the simplified product structure shortens the design cycle, simplifies the installation process, and reduces costs. This reduces the processing and installation complexity of the entire insulation system, maintains high quality levels, and improves system reliability. Its reliable structure and high strength provide excellent insulation performance in low-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] FIG1 is a schematic structural diagram of a thermal insulation system of a type B independent liquid tank according to an embodiment of the present application;

[0026] FIG2 is a schematic structural diagram of a fixing assembly according to an embodiment of the present application;

[0027] FIG3 is a schematic structural diagram of area a in FIG1 ;

[0028] FIG4 is a top view of an insulation system of a type B independent liquid tank according to an embodiment of the present application;

[0029] FIG5 is a schematic structural diagram of a splash barrier plate according to an embodiment of the present application;

[0030] FIG6 is a schematic diagram showing the gas flow direction in an annular space according to an embodiment of the present application;

[0031] FIG7 is a schematic structural diagram of a gas purge device according to an embodiment of the present application;

[0032] FIG8 is a schematic structural diagram of area b in FIG1 ;

[0033] FIG9 is a first structural diagram of a protrusion structure according to an embodiment of the present application;

[0034] FIG10 is a second structural diagram of a protrusion structure according to an embodiment of the present application;

[0035] FIG11 is a schematic structural diagram of three types of existing B-type independent liquid tanks.

[0036] 100, outer surface of the tank; 200, prefabricated insulation board; 210, inner insulation layer; 220, outer insulation layer; 230, reinforcement layer; 231, extended overlap layer; 300, fixing assembly; 310, fixing column; 320, U-shaped fixing piece; 330, first stud; 321, folding edge; 400, insulation plug; 500, filler; 510, joint insulation board; 520, foaming caulking material; 53 0. Joint protection layer; 540. Elastic thermal insulation caulking material; 550. Elastic thermal insulation layer; 600. Splash barrier plate; 610. Raised structure; 620. Thermal insulation plug; 630. Flexible liquid-tight material; 640. Metal layer; 700. Gas purge device; 710. Fixing assembly; 711. Fixing clip; 712. Second stud; 720. Gas purge pipe; 721. Air hole; 800. Outer protective layer. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0039] According to the design specifications, an insulation system must be installed outside the Type B independent tank to prevent the hull temperature from dropping below the allowable value and to control the heat flow entering the tank to a level that can be maintained by the pressure and temperature control system. The insulation systems for Type B independent tanks currently in practical use on the market are mainly plate insulation systems, that is, prefabricated insulation panels are installed on the surface of the tank. The main reason is that the structure of Type B independent tanks is relatively complex and deforms greatly under working conditions. Conventional insulation forms such as polyurethane on-site spray foam insulation layers are not suitable for Type B independent tanks. The plate insulation system theoretically has higher strength and is more suitable for Type B independent tanks. However, there is a big difference between the actual effect of the common plate insulation system and the theoretical design goals. The main disadvantages and shortcomings are as follows:

[0040] 1. The structure of insulation panels is complex and varied, resulting in a long design cycle. The design cycle for the insulation layer of a single tank is generally 2-3 months. Given the tight construction schedule of the actual ship, the insulation design cannot respond promptly to changes in the upstream tank design, posing a significant risk to design quality.

[0041] 2. The shape and structure of the insulation board are complex, and a dedicated production line is required for processing and manufacturing, which requires a large investment; the processing process is cumbersome and the quality risk is high; the output is limited, the stocking cycle is long, and the warehousing and logistics costs are high.

[0042] 3. The insulation panels need to be classified and stacked in different areas at the construction site, which occupies a large area and places high demands on the construction guarantee conditions during the installation process, which puts a heavy burden on the shipyard's supporting work.

[0043] 4. The complex installation process is constrained by multiple factors, including the competence of the construction personnel, the condition of the installation equipment and tools, and the availability of construction support. This makes it difficult to maintain the expected quality level. In particular, the interfaces between insulation panels often suffer from serious quality issues such as cracking of the caulking material, cavities, and poor liquid tightness, which results in the failure of the required insulation and splash barrier functions.

[0044] To address the aforementioned issues, the present application provides, in its first aspect, a thermal insulation system for a Type B independent tank. Type B independent tanks can be categorized into prismatic, square, and irregularly shaped tanks (see Figure 11 ), and the thermal insulation system provided herein is applicable to various tank configurations. Specifically, referring to Figures 1-5 , the thermal insulation system comprises a prefabricated insulation panel 200, a fixing assembly 300, an insulation plug 400, a joint insulation panel 510, and a joint protective layer 530.

[0045] The prefabricated insulation panel 200 is arranged on the outer surface 100 of the liquid tank. The side of the prefabricated insulation panel 200 is stepped. The prefabricated insulation panel 200 includes an inner insulation layer 210, an outer insulation layer 220 and a reinforcement layer 230. The outer insulation layer 220 is arranged on the surface of the inner insulation layer 210 and the size of the outer insulation layer 220 is smaller than the inner insulation layer 210. The reinforcement layer 230 is provided on the junction surface of the inner insulation layer 210 and the outer insulation layer 220 and extends out of the prefabricated insulation panel 200. The reinforcement layer 230 forms an extended overlapping layer 231 at the joint of two adjacent prefabricated insulation panels 200. The materials of the prefabricated insulation panels include polyurethane foam plastic, polystyrene foam plastic, polyethylene plastic and phenolic foam plastic.

[0046] The fixing assembly 300 is positioned at the joints of the prefabricated insulation panels 200. It includes a fixing post 310 and a U-shaped fixing member 320. The lower end of the fixing post 310 is positioned at a predetermined position on the outer surface 100 of the liquid tank. The U-shaped fixing member 320 is positioned between the two inner insulation layers 210. The bottom of the U-shaped fixing member 320 is fixed to the upper end of the fixing post 310. The top of the U-shaped fixing member 320 is provided with a folded edge 321, which is positioned on the stepped side of the prefabricated insulation panel 200. The joints between the inner insulation layers 210 are filled with an elastic insulating caulking material 540. The fixing post 310 is made of a material with a low thermal conductivity, including but not limited to wood and Teflon plastic, to reduce heat transfer to the fixing assembly 300. The prefabricated insulation panels are secured by the mutual fastening of the U-shaped fixing member and the fixing post. In one embodiment, a first threaded hole is formed at the upper end of the fixing post, allowing the U-shaped fixing member to be secured to the fixing post using bolts and washers. The elastic thermal insulation caulking material is an elastic thermal insulation material, including but not limited to glass wool, elastic cotton, aerogel felt, polyethylene plastic, etc. The elastic thermal insulation caulking material fills gaps, thereby maintaining a good thermal insulation effect.

[0047] The insulating plug 400 is placed within the U-shaped region of the U-shaped fixture 320. Its function is to limit the deformation of the U-shaped fixture toward its center plane when subjected to force. Simultaneously, the insulating plug fills the gap within the U-shaped fixture, which helps the present invention maintain its excellent thermal insulation properties. Due to installation requirements, a gap exists between the bottom of the insulating plug and the bottom of the U-shaped fixture. The space between the bottom of the insulating plug 400 and the bottom of the U-shaped fixture 320 is filled with a filler 500. This gap is filled with a filler, and its materials include, but are not limited to, low-temperature glue, silicone, epoxy resin glue, and the like.

[0048] The joint insulation panel 510 is arranged in the joint between adjacent outer insulation layers 220. The joint insulation panel 510 connects the prefabricated insulation panel 200, the extended overlapping layer 231, the U-shaped fixing member 320 and the insulation plug 400; the gap between the joint insulation panel 510 and the outer insulation layer 220 is filled with foam filling material 520.

[0049] The joint protection layer 530 is applied to the upper surface of the joint of the prefabricated insulation board 200. The materials of the joint protection layer include polymer materials, fiberglass materials and metal materials, which can provide good mechanical protection and anti-aging protection.

[0050] In the above implementation process, the installation and fixation of the prefabricated insulation panels are achieved by arranging fixing components between the two prefabricated insulation panels and filling the joints with insulation plugs, joint insulation panels and joint protective layers. Compared with the traditional insulation panels that need to be designed with slots and connected and fixed at the slots, the insulation system disclosed in the present application utilizes fixing components. On the one hand, there is no need to design additional slots, and the structure of the prefabricated insulation panels is simple. Simplifying the product structure can shorten the design cycle, simplify the installation process, and thus reduce costs. On the other hand, compared with slotted insulation panels, which need to be sealed and fixed at 2-3 locations such as the slots of the prefabricated insulation panels and the joints of the prefabricated insulation panels, the present application proposes to connect and fix the insulation system in the joint area of ​​the insulation panels. The installation process is simple, the installation difficulty is low, and it is conducive to maintaining a good quality level and improving the reliability of the system. At the same time, completing the installation and fixation in one go can also avoid the problem of adjusting the installation environment multiple times.

[0051] In the above embodiment, in order to reduce construction, referring to FIG4 , two adjacent rows of prefabricated insulation panels 200 are staggered, and the fixing components 300 are arranged at the joints of the three prefabricated insulation panels 200 at a preset distance, wherein a folded edge 321 of the U-shaped fixing member 320 is placed on the stepped side surfaces of the two prefabricated insulation panels 200 at the same time.

[0052] Referring to Figures 1 and 5, the splash shield plate 600 is also included. The splash shield plate 600 is arranged on the outer surface 100 of the liquid tank. The prefabricated insulation board 200 is arranged on the splash shield plate 600. The inner surface of the splash shield plate 600 is provided with a protrusion structure 610. A continuous annular space is formed between the protrusion structure 610 and the outer surface 100 of the liquid tank. The shape of the protrusion structure can be polygonal (see Figure 9) or hemispherical (see Figure 10). The outer surface of the splash shield plate 600 is provided with a metal layer 640. The metal layer can be a metal foil or a metal sheet to form a liquid-tight layer to act as a splash shield. The splash shield plate 600 is made of insulating materials, including but not limited to polyurethane foam plastics, polystyrene foam plastics, polyethylene plastics and phenolic foam plastics. There are multiple splash shield panels 600. The joints between adjacent splash shield panels 600 are filled with insulating filler strips 620. These filler strips are made of elastic, thermally insulating caulking material to absorb deformation and prevent damage caused by deformation and mutual compression of the splash shield panels at low temperatures. The upper surface of the joints is coated with a flexible, liquid-tight material 630. This flexible, liquid-tight material can be made of glass fiber aluminum foil, carbon fiber aluminum foil, or a composite material. This material forms a liquid-tight layer on the joints, thereby acting as a splash shield.

[0053] In one embodiment, the fixing assembly 300 further includes a first stud 330, the bottom of which is fixedly connected to the outer surface 100 of the liquid tank, and the lower end of the fixing column 310 is connected to the top of the first stud 330, and the lower end of the fixing column 310 compresses and fixes the splash shield 600. In another embodiment, the lower end of the fixing column is provided with a second threaded hole, and the lower end of the fixing column is fastened to the first stud through the second threaded hole, thereby compressing and fixing the splash shield.

[0054] The annular space serves as a leakage channel, directing cryogenic liquid leaking from the tank to the bottom of the tank. Referring to Figures 1, 7, and 8, a gas purge device 700 is installed within the annular space. The splash shield 600 covers the gas purge device 700. The gas purge device 700 includes multiple fixing assemblies 710 and a gas purge pipe 720. The multiple fixing assemblies 710 are fixed to predetermined positions on the outer surface 100 of the tank along a predetermined airflow direction (direction of the arrow in Figure 6). Each fixing assembly 710 includes a fixing clamp 711 and two second studs 712. The two second studs 712 are symmetrically fixed to the outer surface 100 of the tank. The fixing clamp 711 includes a clamping portion and two connecting portions distributed on either side of the clamping portion, each connecting portion connecting one second stud 712. The gas purge pipe 720 is located below the clamping portion of the fixing clamp 711 and has multiple air holes 721 for exhausting gas. Before actual shipboard operation, the annular space is purged by filling the gas purge pipe 720 with an appropriate gas, achieving rapid and complete drying and inerting of the annular space. The independent gas purge design effectively dries and inertes the annular space, facilitating faster and more accurate detection of leaking gas. The resulting annular space offers excellent gas-liquid flow, facilitating better diversion of leaking liquids, and achieving space drying and inerting.

[0055] In one embodiment, the inner insulation layer 210, the outer insulation layer 220 and the reinforcement layer 230 are bonded by an adhesive, and the extended overlapping layer 231 of the reinforcement layer 230 is arranged above the U-shaped fixing member. The reinforcement layer is composed of one or more mesh materials, including glass fiber mesh cloth, carbon fiber mesh cloth and metal mesh.

[0056] In one embodiment, an elastic insulation layer 550 is provided between the splash shield 600 and the prefabricated insulation panel 200. The elastic insulation layer 550 is made of an elastic insulation material, including but not limited to glass wool, elastic cotton, aerogel felt, polyethylene plastic, etc. The elastic insulation layer 550 is designed to fill the gap between the splash shield 600 and the prefabricated insulation panel 200 through natural compression after installation, thereby maintaining a good insulation effect in the present invention.

[0057] In one embodiment, an outer protective layer 800 is further included and is disposed on the outer surface of the prefabricated insulation panel. The material of the outer protective layer 800 has a preset strength and includes polymer, fiberglass reinforced plastic, and metal.

[0058] In one embodiment, an adhesive, which can be low-temperature glue, is provided on the bottom of the seamed insulation panel 510. The adhesive connects the seamed insulation panel 510 to the prefabricated insulation panel 200, the extended overlap layer 231, the U-shaped fastener 320, and the insulation plug 400. The seams between the sides of the seamed insulation panel 510 and the prefabricated insulation panels are filled with polyurethane foam.

[0059] In a second aspect, the present application further provides a ship, comprising the insulation system as described in any one of the embodiments in the first aspect.

[0060] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A thermal insulation system for a type B independent tank, characterized in that: include: A prefabricated insulation board is arranged on the outer surface of the liquid tank, the side surface of the prefabricated insulation board is in a step shape, the prefabricated insulation board comprises an inner insulation layer, an outer insulation layer and a strengthening layer, the outer insulation layer is arranged on the surface of the inner insulation layer and the size of the outer insulation layer is smaller than the inner insulation layer, the strengthening layer is arranged on the intersection surface of the inner insulation layer and the outer insulation layer and extends out of the prefabricated insulation board, and the strengthening layer forms an extended overlapping layer at the joint of two adjacent prefabricated insulation boards; A fixing assembly is arranged at the joint of the prefabricated insulation board, the fixing assembly comprises a fixing column and a U-shaped fixing piece, the lower end of the fixing column is arranged at a predetermined position on the outer surface of the liquid tank, the U-shaped fixing piece is arranged between the inner insulation layers, the bottom of the U-shaped fixing piece is fixed to the upper end of the fixing column, the top of the U-shaped fixing piece is provided with two folded edges, the folded edges are placed on the stepped side of the prefabricated insulation board, and the joint between the inner insulation layers is filled with elastic insulation caulking material; A heat-insulating plug is filled in the U-shaped region of the U-shaped fixing member, and a filler is filled in the space between the bottom of the heat-insulating plug and the bottom of the U-shaped fixing member; A joint insulation board is arranged in the joint between adjacent outer insulation layers, the joint insulation board connects the prefabricated insulation board, the extended overlapping layer, the U-shaped fixing piece and the insulation plug; the gap between the joint insulation board and the outer insulation layer is filled with a foaming caulking material; The joint protection layer is laid on the upper surface of the joint of two adjacent prefabricated insulation panels.

2. The insulation system of type B independent tank according to claim 1, characterized in that: The prefabricated insulation panels in two adjacent rows are staggered, and the fixing components are arranged at a preset distance at the joints of the three prefabricated insulation panels, wherein one folded edge of the U-shaped fixing piece is simultaneously placed on the stepped sides of two prefabricated insulation panels.

3. The insulation system of type B independent tank according to claim 1, characterized in that: It also includes a splash-proof barrier plate, which is arranged on the outer surface of the liquid tank, the prefabricated insulation plate is arranged on the splash-proof barrier plate, the inner surface of the splash-proof barrier plate is provided with a protruding structure, a through annular space is formed between the protruding structure and the liquid tank, and the outer surface of the splash-proof barrier plate is provided with a metal layer.

4. The insulation system of type B independent tank according to claim 3, characterized in that: The fixing assembly also includes a first stud, the bottom of which is fixedly connected to the outer surface of the liquid tank, the lower end of the fixing column is connected to the top of the first stud, and the lower end of the fixing column presses and fixes the splash shield plate.

5. The insulation system of type B independent tank according to claim 3, characterized in that: It also includes a gas purge device arranged in the annular space, the splash shield plate covers the gas purge device, and the gas purge device includes a plurality of fixing components and a gas purge pipe; the plurality of fixing components are fixed at preset positions on the outer surface of the liquid tank along a preset airflow direction, each of the fixing components includes a fixing clamp and two second studs, the two second studs are symmetrically fixed on the outer surface of the liquid tank, the fixing clamp is provided with a clamping portion and two connecting portions distributed on both sides of the clamping portion, and one connecting portion is connected to one second stud; the gas purge pipe is arranged below the clamping portion of the fixing clamp, and the gas purge pipe is provided with a plurality of air holes for exhausting gas.

6. The insulation system of type B independent tank according to claim 1, characterized in that: The inner insulation layer, the outer insulation layer and the reinforcement layer are bonded by an adhesive, the extended overlapping layer of the reinforcement layer is arranged above the U-shaped fixing piece, and the reinforcement layer is composed of one or more grid-like materials, including glass fiber mesh cloth, carbon fiber mesh cloth and metal mesh.

7. The insulation system of type B independent tank according to claim 3, characterized in that: There are multiple splash-proof barrier plates, and the interior of the joint between two adjacent splash-proof barrier plates is filled with insulating plugs. The upper surface of the joint is provided with a flexible liquid-tight material, which includes glass fiber aluminum foil cloth, carbon fiber aluminum foil cloth and composite materials.

8. The insulation system of type B independent tank according to claim 1, characterized in that: The prefabricated thermal insulation board also includes an outer protective layer arranged on the outer surface of the prefabricated thermal insulation board. The material of the outer protective layer has a preset strength and includes a polymer, a glass fiber reinforced plastic material and a metal material.

9. The insulation system of type B independent tank according to claim 1, characterized in that: The bottom of the joint insulation board is provided with adhesive, and the joint insulation board is connected to the prefabricated insulation board, the extended overlapping layer, the U-shaped fixing piece and the insulation plug block through the adhesive; the joint between the side of the joint insulation board and the side of the prefabricated insulation board is filled with polyurethane foam.

10. A ship, characterized in that: An insulation system comprising a type B independent liquid tank as claimed in any one of claims 1 to 9.

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