Plate type system for heat insulation of independent liquid tank and installation method

Abstract

The invention discloses a plate-type system for heat insulation of an independent liquid tank and an installation method, relates to the field of ship design, and aims at optimizing the production cost, the installation cost and the like on the premise of ensuring the reliable key performance of heat insulation. The system comprises a liquid tank, a prefabricated heat insulation plate, a joint heat insulation strip, a fixing assembly and a protection layer. Compared with a plate-type heat insulation product put into practical application, the plate-type heat insulation system is reasonable in design, the design efficiency of the heat insulation system is improved, the prefabrication degree is high, and the production cost is reduced; the installation technology is simplified, the installation quality problem possibly caused by uneven capacity of constructors is avoided, the quality risk is reduced, the tolerance of the B-type independent liquid tank heat insulation system to the external environment is enhanced through the outer protection layer, and the service life of the plate type heat insulation system is prolonged.

Description

Technical Field

[0001] This invention relates to the field of ship design, and more particularly to a plate system and installation method for insulating independent liquid tanks. Background Technology

[0002] On liquefied gas carriers, the liquid-tight hull used to load cryogenic liquid cargo is generally referred to as a liquid tank, while on various types of ships, the liquid-tight hull used to store liquefied gas fuel is generally referred to as a fuel tank. In this invention, the liquid tank or fuel tank specifically refers to an independent liquid tank. Depending on their shape, independent liquid tanks can be classified as prismatic tanks, square tanks, irregularly shaped tanks, and spherical tanks, etc.

[0003] To prevent the temperature of the hull containing the independent liquid tank from dropping below permissible levels and to limit the heat flow into the tank to levels maintained by the pressure and temperature control systems, insulation layers are required for the independent liquid tanks according to the design specifications of the IMO IGC Code. Simultaneously, the tank insulation layer should function as a splash barrier and form a leakage channel with the outer surface of the tank to direct any cryogenic liquid that may leak from the tank downwards into the secondary shielding wall.

[0004] Currently, panel insulation systems are the main insulation systems used in practical applications for independent liquid tanks, which involve installing prefabricated insulation panels on the surface of the liquid tank. The main reason is that independent liquid tanks have complex structures and large deformations under operating conditions, and conventional polyurethane on-site spraying foaming methods are not suitable for low-temperature insulation of independent liquid tanks. Panel insulation systems have higher strength and are suitable for insulation of independent liquid tanks with complex structures and large deformations. However, panel insulation products that have been put into practical application have the following technical bottlenecks: (1) long design cycle and design quality risks; (2) complex insulation product structure and large production investment; (3) high installation and construction conditions and a large burden on shipyards; (4) complex installation process, uneven construction personnel capabilities, and quality risks.

[0005] Patent CN 114458953 A discloses an enclosure system for cryogenic liquefied gas storage, but it lacks a leakage channel between the insulation panel and the outer surface of the tank. This makes it difficult to meet the design requirements of Type B independent liquid tanks, namely, that in the event of leakage, the cryogenic liquid should be guided to a designated collection area through the leakage channel. Furthermore, its two-layer insulation panel design is insufficient to meet the cold insulation requirements of even lower-temperature liquids. These technical bottlenecks result in poor quality and high cost of existing plate insulation systems for independent liquid tanks, making it difficult to fully achieve the required key insulation performance.

[0006] Patent CN118323343A discloses a plate-type insulation system for a liquid cargo tank and a ship's liquid cargo tank. The plate-type insulation system includes a splash barrier layer and a plate-type insulation layer. The splash barrier layer is laid on the outer surface of the liquid cargo tank, and the side of the splash barrier layer that is attached to the liquid cargo tank has a raised structure. The plate-type insulation layer is laid on the outer surface of the splash barrier layer and is formed by assembling multiple prefabricated insulation panels. Each prefabricated insulation panel includes an inner layer, an outer layer, and a reinforcing layer; the inner layer is laid on the outer surface of the splash barrier layer, the reinforcing layer is laid on the outer surface of the inner layer, and the outer layer is laid on the outer surface of the reinforcing layer. This patented technology has a technical defect: the double-layer insulation design cannot meet the increasing insulation requirements of liquid cargo, and the fixing method of its insulation panels still needs optimization. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a plate-type insulation system and installation method for independent liquid tanks, optimizing production and installation costs while ensuring reliable key insulation performance.

[0008] The present invention provides a panel system for insulating an independent liquid tank, comprising a liquid tank, prefabricated insulation panels, joint insulation strips, fixing components, and a protective layer.

[0009] The aforementioned prefabricated insulation panels cover the outer surface of the liquid tank. The prefabricated insulation panels are composed of an inner insulation layer, an inner reinforcing layer, a middle insulation layer, an outer reinforcing layer, and an outer insulation layer from the inside out. The joint insulation strip is composed of an elastic insulation strip and a rigid insulation strip. The fixing assembly is composed of a fixing stud, a fixing plate, a gasket, and a hexagonal bolt.

[0010] The inner insulation layer, middle insulation layer, and outer insulation layer form a stepped structure. The inner surface of the inner insulation layer has a pre-formed groove. The fixing studs are inserted into the stud holes around the inner insulation layer. The fixing plate is set at the upper end of the fixing studs. The washer and hexagonal bolt are threaded onto the upper end of the fixing plate. The elastic insulation strips are set at the joints of the inner insulation layers of two adjacent prefabricated insulation panels and at the joints of the middle insulation layers of two adjacent prefabricated insulation panels. The rigid insulation strips are set between adjacent elastic insulation strips. The protective layer is set on the upper surface of the elastic insulation strips and the outer insulation layer.

[0011] Furthermore, the inner insulation layer, the middle insulation layer, and the outer insulation layer are all made of rigid polyurethane foam, and the inner reinforcing layer and the outer reinforcing layer are both made of metal materials or composite materials; the rigid insulation foam material is polyurethane foam, polystyrene foam, polyethylene foam, and phenolic foam, and glass fiber or hollow glass microspheres can be used; the metal material is a metal mesh, and the composite material is glass fiber mesh or carbon fiber mesh.

[0012] Furthermore, the inner insulation layer is bonded to the middle insulation layer, and the middle insulation layer is bonded to the outer insulation layer for fixation.

[0013] Furthermore, the inner surface of the inner insulation layer is processed into a structure with curved surfaces or angles.

[0014] Furthermore, the independent liquid tank can be a prismatic tank, a square tank, an irregularly shaped tank, or a spherical tank.

[0015] Furthermore, the inner insulation layer is provided with side holes around its perimeter, and stud holes are provided in the side holes.

[0016] Furthermore, the structure of the fixing plate is consistent with that of the side holes, and there are several side holes. The fixing plate is made of rigid heat-insulating material.

[0017] Furthermore, the elastic insulation strip is made of glass wool, fiberglass aluminum foil cloth, melamine foam, polyethylene plastic foam, diene polymer or nitrile rubber polymer, and the rigid insulation strip is made of polyurethane foam, polystyrene foam, polyethylene foam or phenolic foam.

[0018] Furthermore, the elastic insulation strip is bonded and fixed to the prefabricated insulation board.

[0019] An installation method for a plate system for insulating independent liquid tanks according to the present invention is as follows:

[0020] 1) Divide the outer surface of the independent liquid tank into grids and position it with fixing studs;

[0021] 2) After cleaning the paint from the positioning position of the fixing stud on the outer surface of the independent liquid tank, weld the fixing stud. The angle between the welded fixing stud and the outer surface of the independent liquid tank should be 87°-93°.

[0022] 3) Install the prefabricated insulation panel in the composite panel insulation system with independent liquid tanks within the limited range of the fixing studs. Insert the fixing studs into the stud holes of the prefabricated insulation panel, set the fixing components in the side holes of the prefabricated insulation panel, and complete the fixing of the prefabricated insulation panel.

[0023] 3) A joint insulation strip is installed at the joint of two adjacent prefabricated insulation panels. The elastic insulation strip is installed at the joint of the inner insulation layer and the middle insulation layer of the two adjacent prefabricated insulation panels, and the elastic insulation strip is attached to the periphery of the outer insulation layer. A rigid insulation strip is installed between the elastic insulation strips located around the outer insulation layer of the two adjacent prefabricated insulation panels.

[0024] 4) Install a protective layer on the surface of the precast insulation board and the joint insulation strip. The thickness of the protective layer is 1~2mm. The overlap width between the protective layer on the outer surface of the precast insulation board and the protective layer on the surface of the joint insulation strip shall not be less than 20mm, and the overlap length of the protective layer at the two joints shall not be less than 200mm.

[0025] The present invention has the following beneficial effects:

[0026] Compared with existing panel insulation products, the panel insulation system of this invention has a reasonable design, which improves the design efficiency of the insulation system, has a high degree of prefabrication, and reduces production costs. It simplifies the installation process, avoids installation quality problems that may be caused by uneven construction personnel skills, reduces quality risks, and strengthens the resistance of the Type B independent liquid tank insulation system to the external environment through the outer protective layer, thus extending the service life of the panel insulation system. Attached Figure Description

[0027] Figure 1 This refers to a plate system for insulating independent liquid tanks and its installation method.

[0028] Figure 2 A schematic diagram of a prefabricated insulation panel structure for a panel system and installation method for insulating independent liquid tanks. Figure 1 ;

[0029] Figure 3 A schematic diagram of a prefabricated insulation panel structure for a panel system and installation method for insulating independent liquid tanks. Figure 2 ;

[0030] Figure 4 Schematic diagram of a fixing component for a plate system and installation method for insulating independent liquid tanks. Figure 1 ;

[0031] Figure 5 Schematic diagram of a fixing component for a plate system and installation method for insulating independent liquid tanks. Figure 2 ;

[0032] Figure 6 A schematic diagram of the joint structure of a plate system for insulating independent liquid tanks and its installation method;

[0033] Figure 7 A schematic diagram of the groove shape for a plate system and installation method for insulating independent liquid tanks;

[0034] Figure 8 A schematic diagram of the side hole shape of a plate system for insulating independent liquid tanks and its installation method;

[0035] Component symbol descriptions: 1. Liquid tank; 2. Prefabricated insulation panel; 21. Inner insulation layer; 211. Groove; 212. Side hole; 213. Stud hole; 22. Middle insulation layer; 23. Outer insulation layer; 24. Inner reinforcing layer; 25. Outer reinforcing layer; 3. Joint insulation strip; 31. Elastic insulation strip; 32. Rigid insulation strip; 4. Fixing assembly; 41. Fixing stud; 42. Fixing plate; 43. Gasket; 44. Hex bolt; 5. Protective layer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the spirit of the contents disclosed in the present invention will be described in detail below. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0037] The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0038] Example 1

[0039] Thermal insulation system for the dome area of ​​the Type B independent liquid tank

[0040] The insulation layer 22, outer reinforcing layer 25, and outer insulation layer 23, the inner insulation layer 21 and the middle insulation layer 22, and the middle insulation layer 22 and the outer insulation layer 23 are bonded together using low-temperature adhesive. The inner insulation layer 21, the middle insulation layer 22, and the outer insulation layer 23 are made of rigid polyurethane foam. The inner reinforcing layer 24 and the outer reinforcing layer 25 are made of stainless steel mesh. The inner surface of the inner insulation layer 21 has a pre-formed groove 211 to form an annular space, which can guide the leaked low-temperature liquid to the preset space when the main shield fails. The inner surface of the inner insulation layer 21 can be processed into a curved or angled form according to the actual needs of the liquid tank 1. The outer surface edge of the inner insulation layer 21 is provided with edge holes 212 and stud holes 213 for placing the fixing component 4. The fixing component 4 consists of fixing studs 41, fixing plates 42, gaskets 43, and hexagonal bolts 44. The fixing studs 41 are welded to the outer surface of the liquid tank 1. The fixing plate 42 is set on the upper end of the fixing stud 41. The washer 43 and the hexagonal bolt 44 are threaded on the upper end of the fixing plate 42. The side hole 212 is filled with glass wool. The joint insulation strip 3 is composed of an elastic insulation strip 31 and a rigid insulation strip 32. The elastic insulation strip 31 is set between the inner insulation layer 21 and the middle insulation layer 22 of two adjacent prefabricated insulation panels 2, and together with the rigid insulation strip 32, it is set between the outer insulation layer 23 of two adjacent prefabricated insulation panels 2. The rigid insulation strip 32 is set in the middle of the elastic insulation strips 31 on both sides. The elastic insulation strip 31 is made of melamine foam, and the rigid insulation strip 32 is made of rigid polyurethane foam. The elastic insulation strip 31 is bonded to the prefabricated insulation panel 2 and the rigid insulation strip 32 with low temperature adhesive. A thermoplastic polyolefin protective layer 5 is applied to the outer surface of the outer insulation layer 23 of the prefabricated insulation panel 2 and the outer surface of the joint insulation strip 3 by hot air welding technology.

[0041] The following is an installation method for an insulation system used in the dome area of ​​a Type B independent liquid tank according to this embodiment:

[0042] 1) Complete the production of prefabricated insulation panels 2, joint insulation strips 3, fixing components 4 and protective layers 5 in the independent liquid tank 1 insulation plate system according to the design requirements.

[0043] 2) Complete the grid division and positioning of the fixing studs 41 on the outer surface of the independent liquid tank 1 according to the design requirements;

[0044] 3) After cleaning the paint from the positioning position of the fixing stud 41 on the outer surface of the independent liquid tank 1, weld the fixing stud 41. The grinding diameter is 30mm. The coaxiality tolerance between the actual welding position of the fixing stud 41 and the positioning position of the fixing stud 41 is 3mm. The angle between the welded fixing stud 41 and the outer surface of the independent liquid tank 1 is 90°.

[0045] 4) Install the prefabricated insulation panel 2 in the composite plate insulation system of the independent liquid tank 1 within the limited range of the fixing stud 41. Insert the fixing stud 41 into the stud hole 213 of the prefabricated insulation panel 2, set the fixing component 41 in the side hole 212 of the prefabricated insulation panel 2 and complete the fixing of the prefabricated insulation panel 2.

[0046] 5) A joint insulation strip 3 is provided at the joint of two adjacent prefabricated insulation panels 2, wherein the elastic insulation strip 31 is provided at the joint of the inner insulation layer 24 and the middle insulation layer 22 of the two adjacent prefabricated insulation panels 2. In addition, the elastic insulation strip 31 is attached to the periphery of the outer insulation layer 23, and a rigid insulation strip 32 is provided between the elastic insulation strips 31 around the outer insulation layer 23 of the two adjacent prefabricated insulation panels 2.

[0047] 6) Install a protective layer 5 on the surface of the prefabricated insulation board 2 and the joint insulation strip 3. The thickness of the protective layer 5 is 1.2mm. The overlap width between the protective layer 5 on the outer surface of the prefabricated insulation board 2 and the protective layer 5 on the surface of the joint insulation strip 3 is 30mm. The overlap length of the protective layer 5 at the two joints is 220mm.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. The insulation system and installation method for the dome area of ​​a type B independent liquid tank in this embodiment improves the design efficiency of the insulation system, reduces production costs, simplifies the installation process, reduces quality risks, and extends the service life of the panel insulation system.

Claims

1. A plate system for insulating independent liquid tanks, characterized in that, It includes a liquid tank (1), a prefabricated insulation panel (2), a joint insulation strip (3), a fixing component (4), and a protective layer (5); The aforementioned prefabricated insulation panels (2) cover the outer surface of the liquid tank (1). The prefabricated insulation panels (2) are composed of an inner insulation layer (21), an inner reinforcing layer (24), a middle insulation layer (22), an outer reinforcing layer (25), and an outer insulation layer (23) from the inside out. The joint insulation strip (3) is composed of an elastic insulation strip (31) and a rigid insulation strip (32). The fixing component (4) is composed of a fixing stud (41), a fixing plate (42), a gasket (43), and a hexagonal bolt (44). The inner insulation layer (21), the middle insulation layer (22) and the outer insulation layer (23) form a stepped structure. The inner surface of the inner insulation layer (21) is pre-grooved with a groove (211). The fixing stud (41) is inserted into the stud holes (213) provided around the inner insulation layer (21). The fixing plate (42) is set at the upper end of the fixing stud (41). The gasket (43) and the hexagonal bolt (44) are threaded on the upper end of the fixing plate (42). The elastic insulation strip (31) is set at the joint of the inner insulation layer (21) of two adjacent prefabricated insulation boards (2) and at the joint between the middle insulation layer (22) of two adjacent prefabricated insulation boards (2). The rigid insulation strip (32) is set between adjacent elastic insulation strips (31). The protective layer (5) is set on the upper surface of the elastic insulation strip (31) and the outer insulation layer (23).

2. The plate system for insulating independent liquid tanks according to claim 1, characterized in that, The inner insulation layer (21), the middle insulation layer (22) and the outer insulation layer (23) are all made of rigid polyurethane foam, and the inner reinforcing layer (24) and the outer reinforcing layer (25) are both made of metal materials or composite materials; the rigid insulation foam material is polyurethane foam, polystyrene foam, polyethylene foam and phenolic foam, and glass fiber or hollow glass microspheres can be used; the metal material is metal mesh, and the composite material is glass fiber mesh or carbon fiber mesh.

3. A plate system for insulating independent liquid tanks according to claim 1 or 2, characterized in that, The inner insulation layer (21) and the middle insulation layer (22), and the middle insulation layer (22) and the outer insulation layer (23) are all bonded together for fixation.

4. A plate system for insulating independent liquid tanks according to claim 1, characterized in that, The inner surface of the inner insulation layer (21) is processed into a structure with curved surfaces or bends.

5. A plate system for insulating independent liquid tanks according to claim 1, characterized in that, The independent liquid tanks mentioned are prismatic tanks, square tanks, irregularly shaped tanks, and spherical tanks.

6. A plate system for insulating independent liquid tanks according to claim 1, characterized in that, The inner insulation layer (21) is provided with side holes (212) around its perimeter, and stud holes (213) are provided inside the side holes (212).

7. A plate system for insulating independent liquid tanks according to claim 6, characterized in that, The structure of the fixed plate (42) is the same as that of the side hole (212), and there are several side holes (212). The fixed plate (42) is made of rigid heat-insulating material.

8. A plate system for insulating independent liquid tanks according to claim 1, characterized in that, The elastic insulation strip (31) is made of glass wool, fiberglass aluminum foil, melamine foam, polyethylene plastic foam, diene polymer or nitrile rubber polymer, and the rigid insulation strip (32) is made of polyurethane foam, polystyrene foam, polyethylene foam or phenolic foam.

9. A plate system for insulating independent liquid tanks according to claim 1, characterized in that, The elastic insulation strip (31) is bonded and fixed to the prefabricated insulation board (2).

10. The installation method of a plate system for insulating independent liquid tanks as described in claim 1, characterized in that, The installation method is as follows: 1) Divide the grid on the outer surface of the independent liquid tank (1) and position it with the fixing stud (41); 2) After cleaning the paint from the positioning position of the fixing stud (41) on the outer surface of the independent liquid tank (1), weld the fixing stud (41). The angle between the welded fixing stud (41) and the outer surface of the independent liquid tank (1) is 87°-93°. 3) Install the prefabricated insulation panel (2) in the composite plate insulation system of the independent liquid tank (1) within the limited range of the fixed stud (41). Insert the fixed stud (41) into the stud hole (213) of the prefabricated insulation panel (2), set the fixing component (41) in the side hole (212) of the prefabricated insulation panel (2) and complete the fixing of the prefabricated insulation panel (2); 3) A joint insulation strip (3) is provided at the joint of two adjacent prefabricated insulation boards (2), wherein the elastic insulation strip (31) is provided at the joint of the inner insulation layer (24) and the middle insulation layer (22) of the two adjacent prefabricated insulation boards (2), and the elastic insulation strip (31) is attached to the periphery of the outer insulation layer (23). A rigid insulation strip (32) is provided between the elastic insulation strip (31) around the outer insulation layer (23) of the two adjacent prefabricated insulation boards (2). 4) Install a protective layer (5) on the surface of the prefabricated insulation board (2) and the joint insulation strip (3). The thickness of the protective layer (5) is 1~2mm. The overlap width between the protective layer (5) on the outer surface of the prefabricated insulation board (2) and the protective layer (5) on the surface of the joint insulation strip (3) is not less than 20mm. The overlap length of the protective layer (5) at the two joints is not less than 200mm.

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