Insulation systems for Type B independent tanks and ships

Abstract

This application provides an insulation system for a Type B independent tank and a vessel. The insulation system includes: a pre-fabricated insulation panel disposed on the outer surface of the tank and having stepped sides; a fixing unit disposed at the joint of the pre-fabricated insulation panel and including a fixing rod and a U-shaped fixing member, the U-shaped fixing member having two folds on its top portion, the folds being disposed on the stepped sides of the pre-fabricated insulation panel and having elastic insulation filler filled in the joint between the inner insulation layers; an insulation plug embedded in the U-shaped region of the U-shaped fixing member; a joint insulation panel provided in the joint between adjacent outer insulation layers and connected to the pre-fabricated insulation panel, the stretched superimposed layer, the U-shaped fixing member and the insulation plug; and a joint protection layer laid on the upper surface of the joint between two adjacent pre-fabricated insulation panels. According to this application, the product structure is simplified, shortening the design cycle, simplifying the installation process and reducing costs.

Description

Technical Field

[0001] This application relates to the technical field of liquefied gas tankers, and specifically relates to a heat insulation system in a Type B independent tank and a ship.

Background Art

[0002] The liquid-tight housing for loading cryogenic liquid cargo in a liquefied gas tanker is called a liquid cargo tank and is abbreviated as a tank. Tanks are divided into membrane type and independent type. In addition, the independent type includes Type A, Type B, and Type C. The Type B independent tank has been used as a liquefied natural gas transport ship for many years because of its advantages of large space, small daily evaporation rate of LNG, and easy installation and maintenance. However, the Type B independent tank is a tank type with a unique structure, and its heat insulation system is different from that of the membrane type tank, which is relatively mature in technology at present. Since the structure of the Type B independent tank is complex, the deformation in the operating state is large. On the other hand, theoretically, the panel type heat insulation system has high strength. Therefore, most of the heat insulation systems in the currently used Type B independent tanks are mainly panel type heat insulation systems. That is, prefabricated heat insulation panels are attached to the surface of the tank. However, the conventional prefabricated heat insulation panel has a complex outer shape structure. Therefore, the initial design cycle is long (2 to 3 months), and it is necessary to build a dedicated production line for manufacturing and processing, resulting in an increase in investment funds. In addition, the later installation process also becomes complex. Therefore, the actual effect of the panel type heat insulation system often differs greatly from the theoretical design.

[0003] Therefore, there is an urgent need to provide an effective heat insulation system suitable for Type B independent tanks.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The objective of the embodiments of this invention is to provide a Type B independent tank insulation system and vessel that solves the technical problem that conventional insulation systems are structurally complex, have long design cycles, and complicated installation processes, resulting in actual effects that often differ significantly from theoretical designs. [Means for solving the problem]

[0005] In the first phase, an insulation system for a Type B independent tank is provided. The insulation system is a pre-fabricated insulation panel disposed on the outer surface of the tank, having stepped sides, and including an inner insulation layer, an outer insulation layer and a reinforcing layer, wherein the outer insulation layer is disposed on the surface of the inner insulation layer, and the dimensions of the outer insulation layer are smaller than those of the inner insulation layer, and the reinforcing layer is provided on the contact surface between the inner insulation layer and the outer insulation layer and extends from the pre-fabricated insulation panel, wherein the reinforcing layer includes a pre-fabricated insulation panel that forms an extended superimposed layer at the joint of two adjacent pre-fabricated insulation panels, and is disposed at the joint of the pre-fabricated insulation panels and includes a fixing rod and a U-shaped fixing member, wherein the lower end of the fixing rod is provided at a predetermined position on the outer surface of the tank, and the U-shaped fixing member is provided between the inner insulation layers. The fixing unit includes: a U-shaped fixing member whose bottom is fixed to the upper end of the fixing rod, a U-shaped fixing member having two folds on its top surface, the folds being positioned on the stepped side surface of the pre-fabricated insulation panel, and elastic insulation filler being filled in the joint between the inner insulation layers; an insulation plug embedded in the U-shaped region of the U-shaped fixing member, with filler being filled in the space between its bottom and the bottom of the U-shaped fixing member; a joint insulation panel provided in the joint between adjacent outer insulation layers, connected to the pre-fabricated insulation panel, the stretched superimposed layer, the U-shaped fixing member, and the insulation plug, with foam filler being filled in the gap with the outer insulation layer; and a joint protection layer laid on the upper surface of the joint between two adjacent pre-fabricated insulation panels.

[0006] In one embodiment, two adjacent rows of the pre-fabricated insulation panels are arranged alternately, and the fixing units are positioned at predetermined distances from the abutting points of the three pre-fabricated insulation panels. One fold in the U-shaped fixing member is simultaneously positioned on the stepped side surfaces of two pre-fabricated insulation panels.

[0007] In one embodiment, a splash-proof panel is further included. The splash-proof panel is disposed on the outer surface of the tank. The pre-fabricated heat-insulating panel is disposed on the splash-proof panel. A protruding structure is provided on the inner surface of the splash-proof panel. A through-ring space is formed between the protruding structure and the tank. A metal layer is provided on the outer surface of the splash-proof panel.

[0008] In one embodiment, the fixing unit further includes a first stud bolt. The bottom of the first stud bolt is fixedly connected to the outer surface of the tank, and the lower end of the fixing rod is connected to the top of the first stud bolt. Furthermore, the lower end of the fixing rod is pressed against and fixed to the splash-proof panel.

[0009] In one embodiment, the system further includes a gas purging device provided within the annular space. The splash-proof panel covers the gas purging device. The gas purging device includes a plurality of fixing assemblies and a gas purging pipe. The plurality of fixing assemblies are fixed to predetermined positions on the outer surface of the tank along a predetermined airflow direction. Each of the fixing assemblies includes one fixing clip and two second stud bolts. The two second stud bolts are fixed symmetrically to the outer surface of the tank. The fixing clip is provided with a clamping portion and two connecting portions distributed on both sides of the clamping portion, with one of the connecting portions connected to one of the second stud bolts. The gas purging pipe is provided below the clamping portion of the fixing clip. The gas purging pipe is provided with a plurality of vents for discharging gas.

[0010] In one embodiment, the inner insulation layer, the outer insulation layer, and the reinforcing layer are bonded together with an adhesive. The stretched superimposed layer of the reinforcing layer is provided above the U-shaped fixing member. The reinforcing layer is composed of one or more mesh-like materials. The mesh-like materials include glass fiber mesh, carbon fiber mesh, and metal mesh.

[0011] In one embodiment, an elastic thermal insulation layer is provided between the shatterproof panel and the pre-fabricated thermal insulation panel. The material of the elastic thermal insulation layer is an elastic thermal insulation material.

[0012] In one embodiment, the number of shatterproof panels is multiple, and a heat insulating sealant is filled inside the joint between two adjacent shatterproof panels. A flexible liquid-tight material is provided on the upper surface of the joint. The flexible liquid-tight material includes aluminum glass cloth, aluminum carbon fiber cloth, and composite materials.

[0013] In one embodiment, the invention further includes an external protective layer provided on the outer surface of a pre-fabricated thermal insulation panel. The material of the external protective layer has a predetermined strength and includes polymers, glass fiber reinforced plastic materials, and metal materials.

[0014] In one embodiment, an adhesive is provided at the bottom of the joint insulation panel. The joint insulation panel is connected to the pre-fabricated insulation panel, the stretched overlapping layer, the U-shaped fixing member, and the insulation plug by the adhesive. Polyurethane foam is filled into the joint between the side surface of the joint insulation panel and the side surface of the pre-fabricated insulation panel.

[0015] In a second aspect of the present application, a vessel is further provided that includes an insulating system in an isolated tank of type B as described in any embodiment of the first aspect. [Effects of the Invention]

[0016] The thermal insulation system in the independent tank of type B of this invention has the following beneficial effects.

[0017] By optimizing the design of pre-fabricated insulation panels, these panels are secured using fixing units. This simplifies the product structure, shortening the design cycle and simplifying the installation process, thereby reducing costs. This reduces the overall difficulty of processing and installing the insulation system, allowing for the maintenance of a good quality level and improving system reliability. Furthermore, the increased structural integrity and strength enable the provision of excellent insulation performance in low-temperature environments.

[0018] To provide a clearer explanation of the technical means of the embodiments of this application, the drawings required for use in the embodiments are briefly described below. It should be noted that the following drawings only illustrate one of the embodiments of this application and should not be considered limiting in scope. A person skilled in the art may create further related drawings based on these drawings, provided that no new creative acts are involved. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic diagram of the structure of the insulation system in a Type B independent tank, as shown based on an embodiment of the present invention. [Figure 2] This is a schematic diagram of the structure of a fixed unit based on an embodiment of the present invention. [Figure 3] This is a schematic diagram of the structure of part a in Figure 1. [Figure 4] This is a plan view of the insulation system in a Type B independent tank, as shown based on an embodiment of the present invention. [Figure 5] This is a schematic diagram of the structure of a shatterproof panel based on an embodiment of the present invention. [Figure 6] This is a schematic diagram of the gas flow direction in an annular space, based on an embodiment of the present invention. [Figure 7] This is a schematic diagram of the structure of a gas purging device based on an embodiment of the present invention. [Figure 8] This is a schematic diagram of the structure of part b in Figure 1. [Figure 9] Figure 1 is a schematic structural view of the protruding structure shown based on an embodiment of the present application. [Figure 10] Figure 2 is a schematic structural view of the protruding structure shown based on an embodiment of the present application. [Figure 11] Figure 3 is a schematic structural view of three types of tank shapes for a conventional Type B independent tank.

Mode for Carrying Out the Invention

[0020] In order to make the objectives, technical means, and advantages of the embodiments of the present application clearer, the technical means in the embodiments of the present application will be described clearly and concisely below in combination with the drawings of the embodiments of the present application. Needless to say, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Also, usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed with various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application shown in the drawings is not intended to limit the scope of the present application claimed for protection, but only shows optional embodiments of the present application. All other embodiments obtained on the premise that those skilled in the art do not require creative labor based on the embodiments of the present application all belong to the scope of protection of the present application.

[0022] According to the design specifications, an insulation system is required on the outside of Type B isolated tanks to prevent the hull temperature from dropping below acceptable levels and to control the heat flux entering the tanks to a level that can be maintained by the pressure and temperature control system. Currently, the most common insulation system for Type B isolated tanks on the market is a panel-type insulation system. That is, pre-fabricated insulation panels are attached to the surface of the tank. This is mainly because Type B isolated tanks have a complex structure and undergo significant deformation during operation, making common insulation methods such as polyurethane spray foam insulation layers unsuitable for use in Type B isolated tanks. In contrast, panel-type insulation systems theoretically have high strength and are therefore relatively suitable for use in Type B isolated tanks. However, there is a significant difference between the actual effectiveness of a typical panel-type insulation system and its theoretical design objectives. The main drawbacks and problems are as follows:

[0023] 1. The structure of insulation panels is complex and there are many types. As a result, the design cycle is long, and generally, the design cycle for the insulation layer per tank is 2 to 3 months. Such insulation design poses a significant design quality risk because it is difficult to respond quickly to changes in the upstream tank design when the construction cycle of the actual ship is relatively tight.

[0024] 2. Due to the complex external structure of the insulation panels, manufacturing and processing cannot be carried out without constructing a dedicated production line, which increases capital investment. In addition, the processing process is complicated, and the quality risk is high. Furthermore, production volume is limited, the supply cycle is long, and storage and logistics costs are high.

[0025] 3. Because the insulation panels need to be sorted, separated, and stacked at the construction site, the occupied area is large. In addition, the high requirements for construction guarantee conditions during the installation process place a heavy burden on the shipyard's outfitting work.

[0026] 4. Due to the complexity of the installation process, it is difficult to maintain the specified quality level of installation quality, as it is constrained by multiple factors, including subjective and objective factors such as the skill level of the installer, the condition of the installation equipment and tools, and the warranty conditions for installation. In particular, serious quality problems such as cracks, voids, and reduced liquid tightness in the filler material often occur at the joints between insulation panels, resulting in the loss of the specified insulation function and the anti-scattering barrier function.

[0027] To solve the above problems, the present invention provides, as a first method, an insulation system for a Type B independent tank. Type B independent tanks can be classified into prism-shaped tanks, rectangular tanks, special-shaped tanks (see Figure 11), etc., and the insulation system for a Type B independent tank provided in this invention is applicable to various tank shapes. Specifically, referring to Figures 1 to 5, the insulation system includes a pre-fabricated insulation panel 200, a fixing unit 300, an insulation plug 400, a joint insulation panel 510, and a joint protection layer 530.

[0028] The prefabricated insulation panel 200 is placed on the outer surface 100 of the tank. The sides of the prefabricated insulation panel 200 are stepped. The prefabricated insulation panel 200 includes an inner insulation layer 210, an outer insulation layer 220, and a reinforcing layer 230. The outer insulation layer 220 is placed on the surface of the inner insulation layer 210, and the dimensions of the outer insulation layer 220 are smaller than those of the inner insulation layer 210. The reinforcing layer 230 is provided at the contact surface between the inner insulation layer 210 and the outer insulation layer 220 and extends from the prefabricated insulation panel 200. The reinforcing layer 230 forms an extended superimposed layer 231 at the joint between two adjacent prefabricated insulation panels 200. The materials of the prefabricated insulation panel include polyurethane foam, polystyrene foam, polyethylene, and phenolic foam.

[0029] The fixing unit 300 is positioned at the joint of the pre-fabricated insulation panel 200. The fixing unit 300 includes a fixing rod 310 and a U-shaped fixing member 320. The lower end of the fixing rod 310 is provided at a predetermined position on the outer surface 100 of the tank, and the U-shaped fixing member 320 is provided 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 rod 310. A fold 321 is provided at the top of the U-shaped fixing member 320. The fold 321 is positioned on the stepped side surface of the pre-fabricated insulation panel 200. Elastic thermal insulation filler 540 is filled into the joints between the inner insulation layers 210. The fixing rod 310 is made of a material with low thermal conductivity, including (but not limited to) wood and polytetrafluoroethylene. This reduces the thermal conductivity of the fixing unit 300. Furthermore, by tightening and fixing the U-shaped fixing member and the fixing rod to each other, the pre-fabricated insulation panel can be fixed in place. In one embodiment, a first screw hole is provided at the upper end of the fixing rod, and a U-shaped fixing member can be fixed to the fixing rod with a bolt and gasket. The elastic thermal insulation filler is an elastic thermal insulation material that includes (but is not limited to) glass wool, elastic cotton, aerogel blanket, polyethylene, etc. The elastic thermal insulation filler has the effect of maintaining a good thermal insulation effect by filling voids.

[0030] The heat insulating plug 400 is embedded within the U-shaped region of the U-shaped fixing member 320. The heat insulating plug has the effect of suppressing deformation toward the center plane when the U-shaped fixing member is subjected to an external force. In addition, the heat insulating plug fills the gap in the U-shaped fixing member and thus effectively acts to maintain good heat insulating properties in this invention. Due to the need for installation, a gap exists between the bottom of the insulation plug and the bottom of the U-shaped fixing member. The space between the bottom of the insulation plug 400 and the bottom of the U-shaped fixing member 320 is filled with a filler 500. This gap is filled with a filler made of materials including (but not limited to) low-temperature adhesives, silicone, epoxy resin adhesives, etc.

[0031] The joint insulation panel 510 is installed in the joint between adjacent outer insulation layers 220. The joint insulation panel 510 is connected to a pre-fabricated insulation panel 200, an extended overlapping layer 231, a U-shaped fixing member 320, and an insulation plug 400. The gap between the joint insulation panel 510 and the outer insulation layer 220 is filled with foam filler 520.

[0032] The joint protection layer 530 is laid on the upper surface of the joints of the pre-fabricated insulation panels 200. The material of the joint protection layer includes polymer material, glass fiber reinforced plastic material, and metal material. This provides good mechanical protection and protection against aging.

[0033] In the above implementation process, a fixing unit is placed between two pre-fabricated insulation panels, and insulation plugs, joint insulation panels, and joint protection layers are filled into the joints to achieve the installation and fixing of the pre-fabricated insulation panels. The thermal insulation system disclosed in this application eliminates the need for separate slot design by using a fixing unit, compared to conventional thermal insulation panels that require slot design and connection / fixing at the slot portion. As a result, the pre-fabricated thermal insulation panel has a simpler structure. Simplifying the product structure in this way shortens the design cycle and simplifies the installation process, thus reducing costs. Furthermore, in the case of insulation panels with pre-fabricated slots, sealing and fixing must be performed at two to three locations, such as the pre-fabricated slot portions of the insulation panel or the pre-fabricated joints of the insulation panel. In contrast, this invention provides an insulation system that connects and fixes within a single area, namely the joint of the insulation panel. This simplifies the installation process and reduces the difficulty of installation, which is advantageous in maintaining a good quality level and improving the reliability of the system. In addition, since installation and fixing are completed in one step, problems related to multiple adjustments and installation environments can be avoided.

[0034] In the above embodiment, in order to reduce the number of installations, two adjacent rows of pre-fabricated insulation panels 200 are arranged alternately, and the fixing units 300 are placed at predetermined distances from the abutting points of the three pre-fabricated insulation panels 200 (see Figure 4). In addition, one fold 321 of the U-shaped fixing member 320 is simultaneously placed on the stepped side surfaces of two pre-fabricated insulation panels 200.

[0035] Furthermore, a shatterproof panel 600 is included, which is positioned on the outer surface 100 of the tank (see Figures 1 and 5). In addition, a pre-fabricated heat insulating panel 200 is positioned on the shatterproof panel 600. A protruding structure 610 is provided on the inner surface of the shatterproof panel 600. A penetrating annular space is formed between the protruding structure 610 and the outer surface 100 of the tank. The shape of the protruding structure may be polygonal (see Figure 9) or hemispherical (see Figure 10). A metal layer 640 is provided on the outer surface of the shatterproof panel 600. The metal layer may be a metal foil or a metal sheet, as long as it can form a liquid-tight layer and act as a shatterproof barrier. The shatterproof panel 600 is made of an insulating material including (but not limited to) polyurethane foam, polystyrene foam, polyethylene, and phenolic foam. There are multiple shatterproof panels 600, and an insulating sealant 620 is filled inside the joint between two adjacent shatterproof panels 600. The insulating sealant is made of an elastic insulating filler that absorbs deformation to prevent damage caused by the shatterproof panels deforming at low temperatures or pressing against each other. In addition, a flexible liquid-tight material 630 is provided on the upper surface of the joint. The flexible liquid-tight material includes aluminum glass cloth, aluminum carbon fiber cloth, and composite materials, and has the function of acting as a shatterproof barrier by forming a liquid-tight layer on the joint.

[0036] In one embodiment, the fixing unit 300 further includes a first stud bolt 330. The bottom of the first stud bolt 330 is fixedly connected to the outer surface 100 of the tank, and the lower end of the fixing rod 310 is connected to the top of the first stud bolt 330. In addition, the lower end of the fixing rod 310 is pressed against and fixed to the splash guard panel 600. In one embodiment, a second screw hole is provided at the lower end of the fixing rod. The lower end of the fixing rod can be fastened and connected to the first stud bolt via the second screw hole, and can also be pressed against and fixed to the splash guard panel.

[0037] The annular space serves as a leak path, guiding the low-temperature liquid leaking from the tank down to the bottom of the tank. Referring to Figures 1, 7, and 8, a gas purging device 700 is provided within the annular space. The splash-proof panel 600 covers the gas purging device 700. The gas purging device 700 includes a plurality of fixed assemblies 710 and a gas purging pipe 720. The plurality of fixed assemblies 710 are fixed to predetermined positions on the outer surface 100 of the tank along a predetermined airflow direction (direction of the arrows in Figure 6). Each fixed assembly 710 includes one fixed clip 711 and two second stud bolts 712. The two second stud bolts 712 are fixed symmetrically to the outer surface 100 of the tank. The fixing clip 711 is provided with a clamping portion and two connection portions distributed on both sides of the clamping portion. One connection portion is connected to one second stud bolt 712. The gas purge pipe 720 is provided below the clamping portion of the fixing clip 711. The gas purge pipe 720 has multiple vents 721 for discharging gas. Before actual ship operation, the annular space is purged by introducing an appropriate gas into the gas purge pipe 720, thereby achieving rapid and complete drying and inactivation of the annular space. The independent gas purge design provides good drying and inactivation effects on the space, making it effective for more rapid and accurate detection of leaked gas. Furthermore, the constructed annular space provides good gas-liquid fluidity, which is effective in better guiding leaked liquid and drying and inactivating the space.

[0038] In one embodiment, the inner insulation layer 210, the outer insulation layer 220, and the reinforcing layer 230 are bonded together with an adhesive. The stretched superimposed layer 231 of the reinforcing layer 230 is provided above the U-shaped fixing member. The reinforcing layer is composed of one or more mesh-like materials. Mesh-like materials include glass fiber mesh, carbon fiber mesh, and metal mesh.

[0039] In one embodiment, an elastic thermal insulation layer 550 is provided between the shatterproof panel 600 and a pre-fabricated thermal insulation panel 200. The material of the elastic thermal insulation layer 550 is an elastic thermal insulation material including (but not limited to) glass wool, elastic cotton, aerogel blanket, polyethylene, etc. The elastic thermal insulation layer 550 has the effect of maintaining a good thermal insulation effect in the present invention by compressing the voids in the thermal insulation panel due to the natural pressing force that acts after the shatterproof panel 600 and the pre-fabricated thermal insulation panel 200 are installed.

[0040] In one embodiment, the invention further includes an external protective layer 800 provided on the outer surface of a pre-fabricated thermal insulation panel. The material of the external protective layer 800 has a predetermined strength and includes polymers, glass fiber reinforced plastic materials, and metal materials.

[0041] In one embodiment, an adhesive is provided at the bottom of the joint insulation panel 510. The adhesive may be a low-temperature adhesive. The joint insulation panel 510 is connected by the adhesive to a pre-fabricated insulation panel 200, a stretched overlay layer 231, a U-shaped fixing member 320, and an insulation plug 400. Polyurethane foam is filled into the joint between the side surface of the joint insulation panel 510 and the side surface of the pre-fabricated insulation panel.

[0042] In the second method, the present application further provides a vessel including the thermal insulation system described in any embodiment of the first method.

[0043] The foregoing description is merely a preferred embodiment of the present application and does not limit it. Various modifications and variations of the present application are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the purpose and principles of the present application are all covered by the present application. [Explanation of Symbols]

[0044] 100 Tank outer surface 200 pre-fabricated insulation panels 210 Inner insulation layer 220 Outer insulation layer 230 reinforcement layer 231 Extended Overlay Layer 300 Fixed Units 310 Fixed Rod 320 U-shaped fixing member 330 First stud bolt 321 Turnaround 400 Insulated Plugs 500 Filler 510 Seam Insulation Panel 520 Foam Filler 530 Seam protection layer 540 Elastic thermal insulation filler 550 Elastic insulation layer 600 Shatterproof Panel 610 Protruding structure 620 Insulation sealant 630 Flexible liquid tight material 640 Metal layer 700 Gas purging device 710 Fixed Assembly 711 Fixing Clip 712 Second stud bolt 720 Gas purge pipe 721 Ventilation holes 800 outer protective layer

Claims

1. In an insulation system for a Type B independent tank, A pre-fabricated insulation panel placed on the outer surface of a tank, having stepped sides, and including an inner insulation layer, an outer insulation layer, and a reinforcing layer, wherein the outer insulation layer is placed on the surface of the inner insulation layer, and the dimensions of the outer insulation layer are smaller than those of the inner insulation layer, and the reinforcing layer is provided on the contact surface between the inner insulation layer and the outer insulation layer and extends from the pre-fabricated insulation panel, wherein the reinforcing layer forms an extended superimposed layer at the joint between two adjacent pre-fabricated insulation panels, A fixing unit is provided, which is positioned at the joint of the pre-fabricated insulation panel and includes a fixing rod and a U-shaped fixing member, wherein the lower end of the fixing rod is provided at a predetermined position on the outer surface of the tank, the U-shaped fixing member is provided between the inner insulation layers, the bottom of the U-shaped fixing member is fixed to the upper end of the fixing rod, two folds are provided on the top of the U-shaped fixing member, the folds are positioned on the stepped side surface of the pre-fabricated insulation panel, and elastic insulation filler is filled in the joint between the inner insulation layers. An insulating plug embedded within the U-shaped region of the U-shaped fixing member, with a filler material filling the space between the bottom and the bottom of the U-shaped fixing member, A joint insulation panel is provided within the joint between adjacent outer insulation layers, and is connected to the pre-fabricated insulation panel, the stretched overlapping layer, the U-shaped fixing member, and the insulation plug, with foam filler material filling the gap with the outer insulation layer. A joint protection layer laid on the upper surface of the joint between two adjacent pre-fabricated insulation panels, An insulating system for a Type B independent tank, characterized by including the following:

2. Two adjacent rows of the pre-fabricated insulation panels are arranged in an alternating pattern, and the fixing units are placed at predetermined distances from the abutting points of the three pre-fabricated insulation panels. The insulation system for an independent tank of type B according to claim 1, characterized in that one fold in the U-shaped fixing member is simultaneously positioned on the stepped side surfaces of the two pre-fabricated insulation panels.

3. Furthermore, including a shatterproof panel, The insulation system for an independent tank of type B according to claim 1, characterized in that the splash-proof panel is arranged on the outer surface of the tank, the pre-fabricated insulation panel is arranged on the splash-proof panel, a protruding structure is provided on the inner surface of the splash-proof panel, a through-ring space is formed between the protruding structure and the tank, and a metal layer is provided on the outer surface of the splash-proof panel.

4. The insulation system for an independent tank of type B according to claim 3, further comprising a first stud bolt, the bottom of which is fixedly connected to the outer surface of the tank, the lower end of which is connected to the top of which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to which is connected to the splash-proof panel.

5. Furthermore, it includes a gas purging device provided within the annular space, The splash-proof panel covers the gas purging device, which includes a plurality of fixed assemblies and a gas purging pipe, the plurality of fixed assemblies being fixed at predetermined positions on the outer surface of the tank along a predetermined airflow direction. Each of the aforementioned fixing assemblies includes one fixing clip and two second stud bolts, the two of which are symmetrically fixed to the outer surface of the tank. The thermal insulation system for an independent tank of type B according to claim 3, characterized in that the fixing clip is provided with a clamping portion and two connecting portions distributed on both sides of the clamping portion, one of the connecting portions is connected to one of the second stud bolts, the gas purge pipe is provided below the clamping portion of the fixing clip, and the gas purge pipe has a plurality of vents for discharging gas.

6. The inner insulation layer, the outer insulation layer, and the reinforcing layer are bonded together with an adhesive, the stretched superimposed layer of the reinforcing layer is provided above the U-shaped fixing member, and the reinforcing layer is composed of one or more mesh-like materials. The thermal insulation system for a Type B independent tank according to claim 1, characterized in that the mesh material includes glass fiber mesh, carbon fiber mesh, and metal mesh.

7. The thermal insulation system for an independent tank of type B according to claim 3, characterized in that there are multiple anti-scattering panels, a thermal insulation sealant is filled inside the joint between two adjacent anti-scattering panels, a flexible liquid-tight material is provided on the upper surface of the joint, and the flexible liquid-tight material includes aluminum glass cloth, aluminum carbon fiber cloth, and composite materials.

8. Furthermore, it includes an external protective layer provided on the outer surface of a pre-fabricated insulation panel. The insulation system for a Type B independent tank according to claim 1, characterized in that the material of the external protective layer has a predetermined strength and includes a polymer, a glass fiber reinforced plastic material, and a metal material.

9. The insulation system for an independent tank of type B according to claim 1, characterized in that an adhesive is provided at the bottom of the joint insulation panel, the joint insulation panel is connected by the adhesive to the pre-fabricated insulation panel, the stretched overlapping layer, the U-shaped fixing member and the insulation plug, and polyurethane foam is filled into the joint between the side surface of the joint insulation panel and the side surface of the pre-fabricated insulation panel.

10. A vessel comprising an insulating system in an independent tank of type B as described in any one of claims 1 to 9.

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