Plate type heat insulation structure for low-temperature storage tank

Abstract

The utility model discloses a plate type heat insulation structure for a low-temperature storage tank, the plate type heat insulation structure comprises a plurality of heat insulation pieces which are adjacently lapped, each heat insulation piece comprises a positioning rod used for being fixed on the low-temperature storage tank, and one end of the positioning rod far away from the low-temperature storage tank is provided with a positioning plate; a sliding layer is arranged at the position, corresponding to the positioning plate, of the first heat insulation plate, and the sliding layer makes contact with the surface of the positioning plate and can slide relative to the positioning plate; the second heat insulation plate is arranged on the side, away from the low-temperature storage tank, of the first heat insulation plate; a trapezoid inner groove is formed between every two adjacent second heat insulation plates, the trapezoid inner grooves are filled with foaming polyurethane foam, and the space between every two adjacent first heat insulation plates is filled with an elastic compensation layer. The heat insulation structure is not prone to cracking when the low-temperature storage tank expands with heat and contracts with cold.

Description

Technical Field

[0001] The utility model relates to the field of thermal insulation devices, in particular to a plate-type thermal insulation structure used for a low-temperature storage tank. Background Art

[0002] Cryogenic tanks are used to store liquefied gas, including: liquefied gas carriers, dual-fuel ships, land-based liquefied gas tanks and other rhombus-shaped cryogenic tanks. Liquefied gas usually refers to a low-temperature liquid that is mainly divided into methane, ethane and other gases and cooled to about -50℃~-163℃ and compressed to a few percent of its gas volume. It is an important energy source and chemical raw material. Liquefied gas carriers are the main means of transportation for liquefied gas at sea. They are high-tech, high-difficulty and high-value-added ships; the container for loading liquefied gas is called a liquid cargo tank, which is the most important facility of a liquefied gas ship.

[0003] Due to the large temperature difference between liquefied gas and the external environment, if there is no insulation layer to block it, a large amount of liquefied gas will be vaporized, resulting in waste and safety problems. Traditional liquefied tank insulation uses polyurethane or polystyrene foam materials, and the insulation forms are usually spraying and plate assembly, but each has its own problems. Spray insulation makes the insulation material and the tank body stick together. For cryogenic storage tanks, it is necessary to consider that the insulation layer of the cargo tank and the storage tank can act as a splash screen to prevent liquid cargo leakage in the event of leakage, and ensure that the leaked liquid flows out. Therefore, spray insulation is not suitable for the insulation of all cryogenic storage tanks; for plate assembly insulation, separating the insulation board from the tank body is conducive to the drainage of the leaked liquid, but the plate insulation material and the tank body are usually mechanically connected. Under ultra-low temperature conditions, due to the inconsistency of the thermal expansion coefficients of the tank body and the insulation material itself, the insulation board is prone to cracking. Therefore, developing a suitable insulation structure for special cryogenic storage tanks is an urgent issue for technicians in this field. Utility Model Content

[0004] In order to overcome the defects of the prior art, a plate-type thermal insulation structure for a cryogenic storage tank is provided to solve the problem that the existing thermal insulation structure is prone to cracking when the cryogenic storage tank expands and contracts due to heat.

[0005] In order to achieve the above technical effects, the solution provided by the utility model is to provide a plate-type thermal insulation structure for a cryogenic storage tank, wherein the plate-type thermal insulation structure comprises a plurality of adjacent overlapping thermal insulation members, each of which comprises:

[0006] A positioning rod used to be fixed on the cryogenic storage tank, wherein a positioning plate is provided at one end of the positioning rod away from the cryogenic storage tank;

[0007] A first insulation plate, wherein a sliding layer is provided at a position on the first insulation plate corresponding to the positioning plate, and the sliding layer is in contact with a surface of the positioning plate and can slide relatively thereto;

[0008] A second insulation plate is arranged on a side of the first insulation plate away from the cryogenic storage tank;

[0009] A trapezoidal inner groove is formed between adjacent second heat-insulating panels, and the trapezoidal inner groove is filled with foamed polyurethane foam. An elastic compensation layer is filled between adjacent first heat-insulating panels.

[0010] Preferably, the positioning rod comprises a fixing section for fixing on the cryogenic storage tank and a connecting section detachably connected to the positioning plate, and the fixing section and the connecting section are detachably connected via a connecting piece.

[0011] Preferably, the fixed section is a first screw, the connecting section is a second screw, the connecting piece is an internally threaded sleeve, the first screw and the second screw are threaded together in the internally threaded sleeve, the positioning plate is correspondingly provided with an opening, and the end of the second screw away from the first screw passes through the opening and is threaded with a nut.

[0012] Preferably, the first insulation panel comprises at least two layers of insulation panel units which are relatively staggered.

[0013] Preferably, both the bottom surface and the top surface of the insulation panel unit relatively close to the cryogenic storage tank are provided with a reinforcement layer.

[0014] Preferably, a continuous steel wire mesh is provided between adjacent first insulation boards and adjacent second insulation boards, and the steel wire mesh is fixed to the top surface of the first insulation board.

[0015] Preferably, the inner wall of the trapezoidal inner groove is provided with a coating.

[0016] Preferably, a metal protective layer is provided on the top surface of the second insulation board.

[0017] Preferably, butyl aluminum foil tape is provided between the top surfaces of adjacent metal protective layers.

[0018] Preferably, a pad is provided on the bottom surface of the first insulation board, and the pad is provided with a through hole for the positioning rod to pass through.

[0019] Compared with the prior art, the beneficial effects of the utility model include:

[0020] 1. This solution fixes the first insulation board through the cooperation of the positioning rod, the positioning plate and the sliding layer, and effectively prevents the insulation component from being damaged due to the extrusion between the cryogenic storage tank and the insulation board during the shrinkage process;

[0021] 2. By setting up reinforcement and buffer structures, the insulation structure damage caused by thermal expansion and contraction can be effectively avoided;

[0022] 3. High sealing performance: The first insulation board and the second insulation board are connected as a whole through the foaming polyurethane foam, and butyl aluminum foil tape is set on the outside of the on-site foaming polyurethane foam, which has excellent anti-corrosion and waterproof performance;

[0023] 4. Wide range of applications, including but not limited to: liquefied gas transport ships, dual-fuel ships, land liquefied gas storage tanks and other rhombus-shaped cryogenic storage tanks;

[0024] 5. Reliable structure: adopt staggered structure design to effectively avoid cold bridges;

[0025] 6. Simple structure, easy to produce and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The utility model is a schematic diagram of the overall structure of a plate-type thermal insulation structure for a low-temperature storage tank.

[0028] Figure 2 The utility model is a schematic diagram of the structure of each layer of the heat insulation component of the plate-type heat insulation structure used for the low-temperature storage tank.

[0029] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0030] Figure 4 The utility model is a schematic diagram of a plan view of a plate-type thermal insulation structure for a low-temperature storage tank.

[0031] Figure 5 The utility model is a structural schematic diagram of a sliding layer of a plate-type thermal insulation structure used for a low-temperature storage tank.

[0032] The corresponding relationship of the numbers in the figure is as follows:

[0033] 1. Cryogenic storage tank; 2. First insulation panel unit; 3. Second insulation panel unit; 4. Third insulation panel unit; 5. Coating; 6. Reinforcement layer; 7. Pad; 8. Elastic compensation layer; 9. Fixed section; 10. Connector; 11. Connecting section; 12. Positioning plate; 13. Stainless steel gasket; 14. Nut; 15. Sliding layer; 16. Metal protective layer; 17. Wire mesh; 18. Rivet; 19. Foamed polyurethane foam; 20. Butyl aluminum foil tape; 21. Long slot hole; 22. Trapezoidal inner groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figures 1 to 5 As shown, the embodiment of the utility model provides a plate-type thermal insulation structure for a cryogenic storage tank, comprising a plurality of adjacent overlapping thermal insulation members, each thermal insulation member comprising:

[0036] A positioning rod for fixing on the cryogenic storage tank 1, a positioning plate 12 is provided at one end of the positioning rod away from the cryogenic storage tank 1. In this embodiment, the first insulation board includes a first insulation board unit 2 and a second insulation board unit 3. A sliding layer 15 is provided at the position of the first insulation board corresponding to the positioning plate, and the sliding layer 15 is in contact with the surface of the positioning plate 12 and can slide relatively; the second insulation board is provided on the side of the first insulation board away from the cryogenic storage tank 1, and the second insulation board includes a third insulation board unit 4.

[0037] A trapezoidal inner groove 22 is formed between adjacent third insulation panel units 4, and the trapezoidal inner groove 22 is filled with foamed polyurethane foam 19. An elastic compensation layer 8 is filled between adjacent first insulation panels, that is, an elastic compensation layer 8 is installed between adjacent first insulation panel units 2 and adjacent second insulation panel units 3. The elastic compensation layer 8 has a buffering effect during low-temperature shrinkage and deformation. The on-site foamed polyurethane foam 19 can foam freely inside the trapezoidal inner groove 22, and the trapezoidal inner groove 22 can effectively enhance the tensile strength of the on-site foamed polyurethane foam 19. The foamed polyurethane foam 19 can connect the first insulation panel and the second insulation panel as a whole. Preferably, the foamed polyurethane foam 19 filled in the trapezoidal inner groove 22 and the elastic compensation layer 8 filled between the adjacent first insulation panels are staggered.

[0038] Preferably, the insulation board material can be one or more of rigid polyurethane foam plastic, rigid polystyrene foam plastic, and phenolic foam plastic.

[0039] Preferably, the sliding layer 15 is made of glued wood.

[0040] Preferably, the positioning plate 12 is made of PTFE. The friction between the contact surface of the PTFE positioning plate 12 and the sliding layer 15 is relatively small, and under the influence of the shrinkage of the insulation layer at low temperatures, relative sliding is achieved.

[0041] Preferably, the elastic compensation layer 8 is glass wool, and may also be made of elastic melamine foam or the like.

[0042] As a preferred embodiment, the sliding layer 15 is provided with a long slot hole 21 for accommodating the positioning rod, and the long slot hole 21 plays a limiting role.

[0043] As a preferred embodiment, the positioning rod includes a fixing section 9 for fixing on the cryogenic storage tank 1 and a connecting section 11 detachably connected to the positioning plate 12, and the fixing section 9 and the connecting section 11 are detachably connected via a connecting member 10. The fixing section 9 plays a role in positioning the cryogenic storage tank 1.

[0044] As a preferred embodiment, the fixed section 9 is a first screw, the connecting section 11 is a second screw, the connecting piece 10 is an internally threaded sleeve, the first screw 9 and the second screw 11 are screwed together in the internally threaded sleeve 10, and a corresponding opening is provided on the positioning plate 12. The end of the second screw 11 away from the first screw 9 passes through the opening and is screwed with a nut 14.

[0045] Preferably, the second screw rod 11 and the internally threaded sleeve 10 can be welded and fixed to form a whole after installation, and then connected to the first screw rod 9 .

[0046] Preferably, thread glue may be applied to the threaded connection between the internal threaded sleeve 10 and the threaded column 9 .

[0047] As a preferred implementation, the second screw rod 11 is further sleeved with a stainless steel gasket 13 above the positioning plate 12 .

[0048] As a preferred embodiment, the first insulation board includes at least two layers of insulation board units that are relatively offset. In this embodiment, the first insulation board unit 2 and the second insulation board unit 3 are relatively offset. Since the first insulation board unit 2 is offset relative to the second insulation board unit 3, the second insulation board unit 3 at the relative position presses the first insulation board unit 2 during installation, and an elastic compensation layer 8 is provided between the first insulation board unit 2 and the second insulation board unit 3 of adjacent insulation components, thereby achieving overlapping assembly.

[0049] As a preferred implementation, Figure 2 and 3 As shown, the bottom and top surfaces of the insulation panel unit relatively close to the low-temperature storage tank 1, namely the first insulation panel unit 2, are provided with a reinforcing layer 6, which can increase the strength of the first insulation panel unit 2. Since the first insulation panel unit 2 will deform more when it is close to the tank body 1, after the reinforcing layer 6 is provided, the deformed shape will compress the reinforcing layer 6, thereby preventing the first insulation panel unit 2 from cracking during the cold contraction process, and at the same time making the second insulation panel unit 3 relatively less deformed.

[0050] Preferably, the reinforcement layer 6 is a glass fiber mesh cloth.

[0051] As a preferred implementation, Figure 3As shown, a continuous steel mesh is provided between the adjacent first insulation board and the adjacent second insulation board, and the steel mesh is fixed to the top surface of the first insulation board. That is, a steel mesh 17 is fixed between the top surfaces of the second insulation board units 3 of the adjacent insulation components, and the steel mesh 17 is overlapped and fixed by rivets 18. The provided steel mesh 17 overlaps the second insulation board units 3 to prevent the elastic compensation layer 8 from being squeezed during installation, and the outer side surface exceeds the outer wall surface of the second insulation board unit 3, and at the same time effectively increases the overall tensile strength of the adjacent insulation components.

[0052] As a preferred embodiment, the inner wall of the trapezoidal inner groove 22 is provided with a coating 5 .

[0053] As a preferred embodiment, a metal protective layer 16 is provided on the top surface of the third insulation panel unit 4 .

[0054] Preferably, the metal protection layer 16 may be an aluminum layer.

[0055] As a preferred implementation, a butyl aluminum foil tape 20 is provided between the top surfaces of adjacent metal protective layers 16 .

[0056] Specifically, a coating 5 is provided on the inner wall of the trapezoidal inner groove 22, and the coating 5 can increase the bonding strength of the bonding interface between the in-situ foamed polyurethane foam 19 and the third insulation board unit 4. After the coating 5 is processed, a butyl aluminum foil tape 20 is used for sealing protection.

[0057] As a preferred embodiment, a pad 7 is provided on the bottom surface of the first insulation board, and a through hole for the positioning rod to pass through is provided on the pad 7. Specifically, the first insulation board unit 2 is provided on the pad 7, so that when the cryogenic storage tank 1 is deformed, the deformation of the first screw 9 will not press against the pad 7. And the pad 7 supports a certain space, if the cryogenic storage tank 1 leaks, the leaked cryogenic liquefied gas cargo can flow from the space supported by the pad 7 to the bottom liquid accumulation tray provided at the bottom of the tank body.

[0058] The specific installation steps of the heat insulation member in the plate-type heat insulation structure of the utility model for low-temperature storage tanks are as follows:

[0059] A first screw rod 9 is welded to the outer wall of the cryogenic storage tank 1 , and a backing plate 7 is installed at the installation position of the first screw rod 9 . A notch is opened in the middle of the backing plate 7 , so that the first screw rod 9 passes through the notch.

[0060] The first insulation panel unit 2 is installed on the outer wall of the backing plate 7, and the reinforcement layer 6 is installed on the bottom and top surfaces of the first insulation panel unit 2, and the second insulation panel unit 3 is installed on the top reinforcement layer 6. At this time, the first end of the second screw rod 11 is passed through the long slot hole 21 of the first insulation panel unit 2, the second insulation panel unit 3, the reinforcement layer 6, and the glulam sliding layer 15, and the end of the first end of the second screw rod 11 is placed in the long slot hole 21 opened in the glulam sliding layer 15. A positioning plate 12 and a stainless steel gasket 13 are sleeved on the outer wall of the first end of the second screw rod 11, and a nut 14 is screwed therein. The second end of the second screw rod 11 is connected to the internal threaded sleeve 10 and is connected to the first screw rod 9, so that the positioning plate 12 is slidably connected to the plywood sliding layer 15, and the nut 14 only makes the first insulation panel unit 2, the reinforcement layer 6, and the second insulation panel unit 3 relatively stably fixed together, that is, the positioning plate 12 is tied and fixed to the low-temperature storage tank 1 by the second screw rod 11 and the first screw rod 9, so that the first insulation panel structure is fixed.

[0061] When the cryogenic storage tank 1 is deformed, the first screw 9, the internal threaded sleeve 10, the second screw 11, the positioning plate 12, the stainless steel gasket 13, and the nut 14 can slide left and right along the glued wood sliding layer 15, effectively preventing the cryogenic storage tank and the insulation board from being squeezed during the shrinkage process and causing damage to the insulation component.

[0062] An elastic compensation layer 8 is installed between adjacent first insulation panel units 2 and adjacent second insulation panel units 3 , and the elastic compensation layer 8 between adjacent first insulation panel units 2 and the elastic compensation layer 8 between adjacent second insulation panel units 3 are staggered.

[0063] A foamed polyurethane foam layer 19 is also provided between two adjacent third insulation panel units 4. The foamed polyurethane foam layer 19 between adjacent third insulation panel units 4 and the elastic compensation layer 8 between adjacent first insulation panels are staggered, thereby achieving better insulation.

[0064] The elastic compensation layer 8 between the adjacent first insulation panel units 2 and the second insulation panel units 3 prevents interstitial heat exchange. The in-situ foamed polyurethane foam layer 19 between the adjacent third insulation panel units 4 prevents heat exchange.

[0065] A plurality of thermal insulation components wrap the cryogenic storage tank 1 to form a complete thermal insulation structure.

[0066] The plate-type insulation structure for a cryogenic storage tank of the utility model comprises a plurality of overlapping adjacent insulation members, wherein a first insulation board and a second insulation board are connected as a whole via a foamed polyurethane foam layer 19, wherein a first insulation unit 2 and a second insulation unit 3 of the first insulation board are fixed to a tank body via a positioning rod, a positioning plate and a sliding layer through cooperation and fastening, so that the first insulation board forms a whole, and the positioning plate and the sliding layer can slide relative to each other, so that during the contraction process of the cryogenic storage tank 1, the extrusion between the cryogenic storage tank 1 and the insulation board can be effectively prevented from causing damage to the insulation member, thereby avoiding cracking of the insulation structure.

[0067] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plate-type thermal insulation structure for a cryogenic storage tank, characterized in that: The plate-type thermal insulation structure comprises a plurality of adjacent overlapping thermal insulation members, each of which comprises: A positioning rod used to be fixed on the cryogenic storage tank, wherein a positioning plate is provided at one end of the positioning rod away from the cryogenic storage tank; A first insulation plate, wherein a sliding layer is provided at a position on the first insulation plate corresponding to the positioning plate, and the sliding layer is in contact with a surface of the positioning plate and can slide relatively thereto; A second insulation plate is arranged on a side of the first insulation plate away from the cryogenic storage tank; A trapezoidal inner groove is formed between adjacent second heat-insulating panels, and the trapezoidal inner groove is filled with foamed polyurethane foam. An elastic compensation layer is filled between adjacent first heat-insulating panels.

2. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: The positioning rod comprises a fixing section for fixing on the low-temperature storage tank and a connecting section detachably connected to the positioning plate, and the fixing section is detachably connected to the connecting section via a connecting piece.

3. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 2, characterized in that: The fixing section is a first screw, the connecting section is a second screw, the connecting piece is an internally threaded sleeve, the first screw and the second screw are screwed together in the internally threaded sleeve, the positioning plate is correspondingly provided with an opening, and the end of the second screw away from the first screw passes through the opening and is screwed with a nut.

4. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: The first insulation panel comprises at least two layers of insulation panel units which are relatively staggered.

5. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 4, characterized in that: The bottom surface and the top surface of the insulation panel unit relatively close to the cryogenic storage tank are both provided with a reinforcement layer.

6. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: A continuous steel wire mesh is provided between adjacent first insulation boards and adjacent second insulation boards, and the steel wire mesh is fixed to the top surface of the first insulation board.

7. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: The inner wall of the trapezoidal inner groove is provided with a coating.

8. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: The top surface of the second insulation board is provided with a metal protective layer.

9. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 8, characterized in that: Butyl aluminum foil tape is arranged between the top surfaces of adjacent metal protective layers.

10. The plate-type thermal insulation structure for a cryogenic storage tank according to claim 1, characterized in that: A pad is provided on the bottom surface of the first heat-insulating plate, and a through hole for the positioning rod to pass through is provided on the pad.

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