Three-layer material composite insulation block and system for low-temperature storage tank

Abstract

The utility model provides a three-layer material composite insulating block and system for a low-temperature storage tank, and the insulating block comprises a first insulating layer, a second insulating layer, a crack arrest layer and a third insulating layer which are sequentially connected along a Z direction, the first insulating layer is made of a fiber type insulating material and extends to the outside of the second insulating layer; the second insulating layer extends to the outside of the third insulating layer; the crack arrest layer is flush with the second insulating layer and is connected with the tank body outer plate through a fastener; in the X direction, the first insulating layer abuts against the first insulating layer in the adjacent three-layer material composite insulating block used for the low-temperature storage tank. According to the utility model, double anti-cracking can be carried out on the first insulating layer, so that the heat preservation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of insulation of cryogenic storage tanks, and particularly relates to a three-layer material composite insulation block and system for cryogenic storage tanks. Background Art

[0002] In the prior art, for the storage of cryogenic liquids such as liquefied natural gas in marine engineering, plate-type thermal insulation structures or spray-type thermal insulation structures are mostly used. However, these two structures are prone to large shrinkage due to the low temperature of the tank body in the cold state. The large shrinkage is likely to cause cracking or peeling off of the outer thermal insulation layer, resulting in a decrease in the thermal insulation effect. Special channels need to be set at the positions in contact with the tank body to maintain a certain gap. The existing designs are relatively complex and costly. For the insulation layer, the insulation temperature difference is the largest on the side close to the tank body, so the deformation is large and it is very easy to cause cracking. The existing insulation systems all indifferently select the same material, and the deformation of the inner layer varies greatly, which is also likely to cause separation and cracking. Summary of the Invention

[0003] The purpose of the utility model is to provide a three-layer material composite insulation block, system and construction method for cryogenic storage tanks. The composite insulation can prevent cracking doubly. The adopted technical solutions are as follows:

[0004] A three-layer material composite insulation block for cryogenic storage tanks includes:

[0005] A first insulation layer 2, a second insulation layer 3, a crack arrest layer 12 and a third insulation layer 4, which are sequentially connected along the Z direction;

[0006] The first insulation layer 2 is made of a fibrous insulation material and extends to the outside of the second insulation layer 3;

[0007] The second insulation layer 3 extends to the outside of the third insulation layer 4;

[0008] The crack arrest layer 12 is flush with the second insulation layer 3 and is connected to the outer plate 1 of the tank through fasteners;

[0009] Along the X direction, the first insulation layer 2 abuts against the first insulation layer in the adjacent three-layer material composite insulation block for cryogenic storage tanks.

[0010] Preferably, along the X direction, a first gap is formed between the second insulation layer 3 and the second insulation layer in the adjacent three-layer material composite insulation block for cryogenic storage tanks, and an insulating strip 8 is filled in the gap;

[0011] Along the X direction, a second gap is formed between the third insulation layer 4 and the third insulation layer in the adjacent three-layer material composite insulation block for cryogenic storage tanks, and a first on-site foamed polyurethane 6 is filled in the second gap.

[0012] Preferably, the first gap is directly above the end face of the first insulating layer 2; the second gap is directly above the first gap.

[0013] Preferably, a first butyl tape 7 is provided on the first in-situ foamed polyurethane 6.

[0014] Preferably, the fastener is a bolt 9;

[0015] One end of the bolt 9 is fixed to the outer plate 1 of the tank, and the other end thereof sequentially passes through the first mounting hole and the crack arrest layer 12 of the first insulating layer 2 and the second insulating layer 3 in the Z direction outward, and extends into the second mounting hole 13 opened on the third insulating layer 4;

[0016] The second mounting hole 13 is filled with a second in-situ foamed polyurethane 15.

[0017] Preferably, the crack arrest layer 12 is a fiberglass mesh.

[0018] Preferably, the second insulating layer 3 is an insulating board;

[0019] The third insulating layer 4 is an insulating board.

[0020] Preferably, an outer protective layer 5 is bonded to the third insulating layer 4, and mounting holes are opened on the outer protective layer 5.

[0021] A three-layer material composite insulation system for a cryogenic storage tank includes a plurality of the three-layer material composite insulation blocks for a cryogenic storage tank.

[0022] A construction method for a three-layer material composite insulation block for a cryogenic storage tank, based on the three-layer material composite insulation block for a cryogenic storage tank, includes the following steps:

[0023] Step 1: Mark the installation positions of the fasteners by drawing lines on the outer surface of the outer plate 1 of the tank, and then weld the fasteners using stud welding;

[0024] Step 2: Fix all the three-layer material composite insulation blocks for a cryogenic storage tank to the outer plate 1 of the tank:

[0025] Step 2A: Put the first insulating layer 2 and the second insulating layer 3 of all the three-layer material composite insulation blocks for a cryogenic storage tank on the fasteners;

[0026] Step 2B: Fill the first gap with an insulating strip 8, and lay the crack arrest layer 12 thereon;

[0027] The crack arrest layer 12 covers two adjacent second insulating layers 3;

[0028] Step 2C: Lay the third insulating layer 4 on the crack arrest layer 12;

[0029] Step 2D, install the gasket 10 on the fastener, and finally screw on the nut;

[0030] Step 2E: Fill the second mounting hole 13 opened on the third insulating layer 4 with the second in-situ foamed polyurethane 15 , and fill the second gap with the first in-situ foamed polyurethane 6 .

[0031] Compared with the prior art, the advantages of the utility model are:

[0032] 1. In terms of physical properties and structure, double anti-cracking design is carried out. Specifically:

[0033] In terms of physical properties: the insulation layer close to the tank body has the largest temperature change, so the deformation is the largest. The first insulation layer 2 itself is not only highly compressible, but also has a certain amount of compression. The section that connects with the adjacent insulation block along the X direction is also in a compressed state. Therefore, the first insulation layer 2 can be deformed to a certain extent, thereby reducing the probability of cracking.

[0034] In terms of structure: the second insulating layer 3, the crack-stopping layer 12 and the third insulating layer 4 further limit the deformation of the first insulating layer 2, preventing it from deforming too much, thereby reducing the probability of cracking.

[0035] 2. Strong structural points are added to prevent the second insulating layer 3 and the third insulating layer 4 from cracking. The strong structural points include the first on-site foamed polyurethane 6 and the insulating strip 8.

[0036] 3. The first layer itself can absorb all deformations caused by thermal expansion and contraction, as well as other tank loads and deformation caused by lifting, which essentially prevents the cracking of the insulation. Therefore, there is no need to lay a crack-stop layer between the first and second layers of insulation, and the process is simpler. At the same time, the two outer layers adopt hard insulation layers with high closed-pore rates to ensure the thermal insulation effect.

[0037] 4. This insulation system adopts a three-layer structure. By adjusting the thickness distribution, it can be applied to cryogenic storage tanks of different temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A partial cross-sectional view of a three-layer composite insulation system for cryogenic storage tanks after expansion;

[0039] Figure 2 for Figure 1 A partial map of

[0040] Figure 3 Schematic diagram of the unfolded three-layer composite insulation system for cryogenic storage tanks.

[0041] 1- Tank outer plate,

[0042] 2 - First insulating layer, 3 - Second insulating layer, 4 - Third insulating layer, 5 - Outer protective layer,

[0043] 6 - First on - site foamed polyurethane, 7 - First butyl tape, 8 - Insulating strip;

[0044] 9 - Bolt, 10 - Gasket, 11 - Nut, 12 - Crack arrest layer, 13 - Second mounting hole, 14 - Second butyl tape, 15 - Second on - site foamed polyurethane. Detailed implementation mode

[0045] The three - layer composite insulating block, system and construction method for cryogenic storage tanks of the present utility model will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the advantageous effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0046] As Figures 1 to 3 , a three - layer composite insulating block for cryogenic storage tanks includes:

[0047] The first insulating layer 2, the second insulating layer 3, the crack arrest layer 12 and the third insulating layer 4 are sequentially pasted along the Z - direction to form an integral body.

[0048] The first insulating layer 2 is made of fibrous insulating material and extends to the outside of the second insulating layer 3;

[0049] The second insulating layer 3 extends to the outside of the third insulating layer 4;

[0050] The second insulating layer 3 is a high - closed - cell rate rigid insulating board; the third insulating layer 4 is a high - closed - cell rate rigid insulating board.

[0051] The crack arrest layer 12 is flush with the second insulating layer 3 and is connected to the outer plate 1 of the tank through fasteners. The crack arrest layer 12 is specifically a fiberglass mesh.

[0052] Along the X - direction, the first insulating layer 2 abuts against the first insulating layer in the adjacent three - layer composite insulating block for cryogenic storage tanks.

[0053] As Figure 1 shown, along the X - direction, a gap one is formed between the second insulating layer 3 and the second insulating layer in the adjacent three - layer composite insulating block for cryogenic storage tanks, and the insulating strip 8 is filled in the gap;

[0054] Along the X - direction, a gap two is formed between the third insulating layer 4 and the third insulating layer in the adjacent three - layer composite insulating block for cryogenic storage tanks, and the first on - site foamed polyurethane 6 is filled in the gap two.

[0055] A first-site foamed polyurethane 6 is provided with a first butyl tape 7.

[0056] A first gap is located directly above the end face of the first insulating layer 2; a second gap is located directly above the first gap.

[0057] An outer protective layer 5 is bonded to the third insulating layer 4, and mounting holes are provided in the outer protective layer 5.

[0058] Along the Y direction, the first insulating layer 2, the second insulating layer 3, the crack arrest layer 12 and the third insulating layer 4 are flush.

[0059] In this embodiment, the "Y direction" refers to the height direction of the cryogenic storage tank, that is, the height direction of the outer plate 1 of the tank.

[0060] The "X direction" refers to the radial direction of the cryogenic storage tank.

[0061] In other embodiments, the definitions of the "Y direction" and the "X direction" can be interchanged.

[0062] Regarding the first insulating layer 2:

[0063] The main component of this layer of insulation is fibrous insulation materials such as glass wool, rock wool, aerogel, phenolic resin, etc., which are prefabricated, pressed and cut into the required size and thickness.

[0064] The structure of this layer of insulation must be loose, and the compressible amount exceeds 20%, so as to allow gas and liquid to pass freely, forming a natural channel for the liquid and gas leaked from the tank body.

[0065] At the same time, due to the loose structure, it can be used for insulation to deform freely as the tank body cools, without forming additional temperature stress, preventing the insulation from cracking as a whole. Its fiber elasticity is very good, and it can automatically absorb the deformation during the construction of the tank body and the pressure deformation during the operation.

[0066] Regarding the second insulating layer 3 and the third insulating layer 4:

[0067] They have strong tensile and compressive strengths to resist the strength of the tank body under thermal expansion and contraction, and can also resist the tensile force formed by the deformation of the tank body during hoisting.

[0068] At the same time, a layer of outer protective layer 5 with a certain liquid tightness is pasted on the outside of the third insulating layer 4, and the material is GRP or aluminum foil, which can not only improve the antioxidant ability of the insulation, but also enhance the mechanical protection ability and tensile ability of the whole insulation.

[0069] The first insulating layer 2 and the second insulating layer 3 can be directly adhered by glue. Since the first layer of insulation has a very strong ability to absorb deformation, there is no need to add a crack arrest layer.

[0070] The second insulating layer 3, the crack arresting layer 12 and the third insulating layer 4 can be pasted with low-temperature glue.

[0071] The first insulating layer 2, the second insulating layer 3, the crack arresting layer 12 and the third insulating layer 4 are prefabricated into a whole in advance.

[0072] Specifically: The three insulating layers of the first insulating layer 2, the second insulating layer 3 and the third insulating layer 4 are prefabricated in the factory workshop, and effective pasting is carried out between the three insulating layers and the crack arresting layer 12 in parallel to prefabricate into a whole, achieving the maximum degree of prefabrication.

[0073] In this embodiment, the fastener is a bolt 9, which is located at the center of the composite insulating block.

[0074] One end of the bolt 9 is fixed to the outer plate 1 of the tank, and the other end thereof sequentially passes through the first mounting hole of the first insulating layer 2 and the second insulating layer 3 and the crack arresting layer 12 along the Z direction outward, and extends into the second mounting hole 13 opened on the third insulating layer 4;

[0075] The second on-site foamed polyurethane 15 is filled in the second mounting hole 13.

[0076] That is, when the insulating block is prefabricated, a hole diameter matching the bolt is pre-opened on the second insulating layer 3 to facilitate the penetration of the bolt during installation.

[0077] A hole (second mounting hole 13) with a diameter of about 150 mm is opened on the third insulating layer 4 to facilitate the installation of the gasket and the tightening of the nut.

[0078] In addition, as can be seen from the foregoing: For this composite insulating block, the size of each layer is different.

[0079] The size of the first insulating layer 2 is the largest, and the size of the prefabricated board of the first insulating layer 2 is larger than the actual floor area. Due to its strong compressibility, an interference relationship is formed with the adjacent prefabricated insulating blocks, which can avoid caulking and can be closely connected to form a good heat preservation effect.

[0080] The size of the second insulating layer 3 is slightly smaller than that of the first insulating layer, and the size of the third insulating layer is smaller than that of the second insulating layer. After the three insulating layers are prefabricated, a stepped shape is formed.

[0081] For the stepped shape between the composite insulating blocks, except that there is no gap between the first insulating layers, the gap between the second insulating layers is filled with the prefabricated insulating strip 8, and a crack arresting net is laid on it.

[0082] The gap between the third insulating layers is filled with the on-site foamed insulation 6 to form a whole with the third insulating layer.

[0083] A three-layer composite insulation system for cryogenic storage tanks, comprising a number of three-layer composite insulation blocks for cryogenic storage tanks.

[0084] A construction method for three-layer composite insulation blocks for cryogenic storage tanks, comprising the following steps:

[0085] Step 1: Mark the installation positions of the fasteners on the outer surface of the outer tank plate 1, and then weld the fasteners using stud welding;

[0086] Step 2: Fix all the three-layer composite insulation blocks for cryogenic storage tanks to the outer tank plate 1:

[0087] Step 2A: Put the first insulation layer 2 and the second insulation layer 3 of all the three-layer composite insulation blocks for cryogenic storage tanks on the fasteners;

[0088] Step 2B: Fill the first gap with the insulation strip 8, and lay the crack arrest layer 12 thereon;

[0089] The crack arrest layer 12 covers two adjacent second insulation layers 3;

[0090] Step 2C: Lay the third insulation layer 4 on the crack arrest layer 12;

[0091] Step 2D: Install the gasket 10 on the fastener, and finally screw on the nut;

[0092] Step 2E: After filling the second installation hole 13 opened in the third insulation layer 4 with the second on-site foamed polyurethane 15, paste the butyl tape; fill the second gap with the first on-site foamed polyurethane 6, and paste the second butyl tape 14 along the X direction.

[0093] Wherein, the second butyl tape 14 connects the outer protective layers 5 of adjacent composite insulation blocks.

[0094] The above is only the preferred embodiment of the present invention and does not impose any limitation on the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present invention, which are all within the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A three-layer composite insulation block for cryogenic storage tanks, characterized in that, Comprising: A first insulating layer (2), a second insulating layer (3), a crack arrest layer (12) and a third insulating layer (4), which are connected in sequence along the Z direction; The first insulating layer (2) is made of a fibrous insulating material and extends to the outside of the second insulating layer (3); The second insulating layer (3) extends to the outside of the third insulating layer (4); The crack arrest layer (12) is flush with the second insulating layer (3) and is connected to the outer plate (1) of the tank by fasteners; Along the X direction, the first insulating layer (2) abuts against the first insulating layer in the adjacent three-layer material composite insulating block for cryogenic storage tanks.

2. The three-layer composite insulating block for a cryogenic storage tank according to claim 1, characterized in that, Along the X direction, a first gap is formed between the second insulating layer (3) and the second insulating layer in the adjacent three-layer material composite insulating block for cryogenic storage tanks, and an insulating strip (8) is filled in the gap; Along the X direction, a second gap is formed between the third insulating layer (4) and the third insulating layer in the adjacent three-layer material composite insulating block for cryogenic storage tanks, and a first on-site foamed polyurethane (6) is filled in the second gap; 3. The three-layer material composite insulation block for a cryogenic storage tank according to claim 2, characterized in that, The first gap is located directly above the end face of the first insulating layer (2); the second gap is located directly above the first gap.

4. The three-layer composite insulation block for cryogenic storage tanks according to claim 2, wherein A first butyl tape (7) is provided on the first on-site foamed polyurethane (6); 5. The three-layer material composite insulation block for cryogenic storage tanks according to claim 1, characterized in that, The fastener is a bolt (9); One end of the bolt (9) is fixed to the outer plate (1) of the tank, and the other end thereof sequentially passes through the first insulating layer (2), the first mounting hole of the second insulating layer (3) and the crack arrest layer (12) along the Z direction outward and extends into the second mounting hole (13) formed on the third insulating layer (4); The second mounting hole (13) is filled with a second on-site foamed polyurethane (15); 6. The three-layer composite insulation block for cryogenic storage tanks according to claim 1, characterized in that, The crack arrest layer (12) is a fiberglass mesh; 7. The three-layer composite insulating block for a cryogenic storage tank according to claim 1, characterized in that, The second insulating layer (3) is an insulating board; The third insulating layer (4) is an insulating board; 8. The three-layer material composite insulation block for cryogenic storage tanks according to claim 1, wherein, An outer protective layer (5) is bonded to the third insulating layer (4), and mounting holes are formed on the outer protective layer (5); 9. A three-layer composite insulation system for cryogenic storage tanks, characterized in that, Comprising a plurality of three-layer material composite insulating blocks for cryogenic storage tanks according to any one of claims 1-8.

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