Low-temperature insulation and heat preservation system for marine low-temperature tank

Abstract

The utility model discloses a low-temperature insulation and heat preservation system of a marine low-temperature tank, which comprises a cryogenic liquid storage tank body, the outer side of the cryogenic liquid storage tank body is sequentially provided with a mold layer, at least one spraying enhancement layer and at least one outer cladding layer from inside to outside, and the cryogenic liquid storage tank body further comprises a gas recovery monitoring device, the mold layer is composed of a plurality of mold pieces which are sequentially and tightly arranged, each mold piece is formed by pressing a thin material with certain flexibility, and the mold pieces make contact with the outer surface of the cryogenic liquid storage tank body through the outer bottom faces of pits evenly pressed on the mold pieces and are bonded and fixed through a binder. A channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body is connected with a gas recovery monitoring device through a pipeline, and the spraying enhancement layer adjacent to the mold piece is directly sprayed on the mold piece. Due to the arrangement of the mold layer, not only is the preparation easy, but also the bearing strength and the flexibility are good, and the safety is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low temperature liquid storage system especially relates to a low temperature insulation heat preservation system of marine low temperature tank. BACKGROUND

[0002] The tank of cryogenic liquid such as liquefied natural gas etc. is easy to cause the leakage of liquid or gas in the tank body during the transportation and use process, and the gas will be directly discharged, which not only causes the waste of gas, but also can cause the environmental pollution and safety problem, therefore, people always want to find a better solution.

[0003] In the prior art, there are some solutions, for example, a channel is left out by arranging block-shaped objects between the tank body and the outer protective layer of the tank body, and the block-shaped objects are fixed on the surface of the tank body, an annular space is formed, and a gas detection device is connected to the annular space to detect the leaked gas, but in this way, the fixing process of the block-shaped objects is troublesome, time-consuming and laborious, and the installation process is slow, and the existence of the block-shaped objects does not enhance the protection of the outer protective layer of the tank body, so that the problem of the bulging of the outer protective layer of the tank body due to excessive pressure cannot be well improved. Therefore, people want to find a kind of low temperature insulation heat preservation system of marine low temperature tank which can reduce the pressure of the outer protective layer of the tank body, has fast manufacturing speed and low cost. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of low temperature insulation heat preservation system of marine low temperature tank which has fast manufacturing speed, low cost, good pressure-bearing capacity and good adaptability.

[0005] The utility model is realized by the following technical solutions:

[0006] A kind of low temperature insulation heat preservation system of marine low temperature tank, including cryogenic liquid storage tank body 1, the outside of the cryogenic liquid storage tank body 1 is sequentially provided with mold layer 2, at least one layer of spraying reinforcement layer 3 and at least one layer of outer layer 4 from inside to outside, at least part of spraying reinforcement layer 3 is provided with anti-crack mesh layer 5, the low temperature insulation heat preservation system of marine low temperature tank further includes a gas recovery monitoring device, the mold layer 2 is made of a plurality of pieces of mold piece 6 that are closely arranged in sequence, the mold piece 6 is pressed from thin material with certain flexibility, the outer bottom surface of the pit 7 uniformly pressed on the mold piece 6 is in contact with the outer surface of the cryogenic liquid storage tank body 1 and is bonded and fixed by adhesive 8, the channel space formed between the bottom surface of the mold piece 6 and the outer surface of the cryogenic liquid storage tank body 1 is connected with the gas recovery monitoring device by pipeline;The spraying reinforcement layer 3 adjacent to the mold piece 6 is directly sprayed on the mold piece 6.

[0007] As a preference, the depth of the concave pits 7 on the mold sheet 6 is less than 100 mm, and the thickness of the thin material used to make the mold sheet 6 is less than 10 mm, and more preferably, the thickness of the thin material used to make the mold sheet 6 is 0.5 mm.

[0008] As a preference, the mold sheet 6 is in a sheet shape or a roll shape before being laid on the outer surface of the cryogenic liquid storage tank body 1, so as to facilitate the application on a larger cryogenic liquid storage tank body.

[0009] As a preference, a plurality of concentric ring-shaped wavy lines 11 are further provided on the bottom of the concave pits 7 of the mold sheet 6, so as to facilitate the more firm combination of the adhesive 8.

[0010] As a preference, the material used to make the thin material of the mold sheet 6 is plastic or metal. More preferably, the material used to make the thin material of the mold sheet 6 is PET, PVC or thin aluminum sheet, and other materials compatible with LNH3 / LNG / LEG / LPG / LH2 / LN2 or other cryogenic liquids with similar properties.

[0011] As a preference, the material used to make the thin material of the mold sheet 6 is transparent, and the adhesive 8 is a colored adhesive. When the mold sheet 6 is transparent and the adhesive 8 is opaque, it is very convenient to directly confirm by naked eye whether the bottom of the concave pit 7 on the mold sheet 6 has been bonded in place with the outer surface of the cryogenic liquid storage tank body 1, thereby greatly ensuring the firmness of the bonding and avoiding the problem of easy bulging and explosion from this place when under pressure due to the weak bonding.

[0012] As a preference, a through hole 9 is provided on the bottom of the concave pit 7, and the area of the through hole 9 is less than the area of the bottom outer surface of the concave pit 7 in contact with the outer surface of the cryogenic liquid storage tank body 1. By providing the through hole 9 on the bottom of the concave pit 7, three effects can be achieved: first, the adhesive 8 can partially pass through the through hole 9 to enter the inner surface of the concave pit 7, so that the mold sheet 6 and the cryogenic liquid storage tank body 1 can be bonded more firmly; second, through the through hole 9, personnel can directly and quickly confirm by naked eye whether the bonding is in place, so as to reduce the confirmation time and speed up the installation; third, through the provision of the through hole 9, if the outer surface of the cryogenic liquid storage tank body 1 below the concave pit 7 is uneven or has pits, etc., the excess gas or bubbles between the uneven places or pits can be discharged outward through the through hole 9 during bonding, so that the bonding can be truly bonded in place without air bubbles, and the problem of difficult bonding with the surface of the attachment of the cryogenic liquid storage tank body 1 when the outer surface is uneven is ingeniously solved, the long-term stability of the bonding is ensured, and the pressure resistance of the mold layer 2 is greatly improved.

[0013] More preferably, the adhesive 8 is a colored adhesive.

[0014] As a preference, some shallow pits with a depth less than that of the pits 7 are also provided on the mold sheet 6 around the pits 7, and when the mold sheet 6 is in contact with and fixed to the outer surface of the cryogenic liquid storage tank body 1 through the pits 7 with a deep depth, the shallow pits with a depth less than that of the pits 7 are not in contact with the outer surface of the cryogenic liquid storage tank body 1, thus, through the existence of the shallow pits, the mold sheet 6 is more resistant to stretching, and can better adapt to thermal expansion and contraction, thus the support stability in extreme conditions can be greatly enhanced.

[0015] As a preference, a polyurethane primer layer 10 is also coated on the outer surface of the cryogenic liquid storage tank body 1, and the outer bottom surface of the pits 7 of the mold sheet 6 is attached to the polyurethane primer layer 10 through the adhesive 8.

[0016] As a preference, the anti-crack mesh layer 5 is a polyurethane mesh, a glass mesh or a metal mesh, and serves as a crack stopper.

[0017] As a preference, the sprayed reinforced layer 3 is made of polyurethane sprayed foam.

[0018] As a preference, the cryogenic insulation system of the marine cryogenic tank comprises 2-14 sprayed reinforced layers 3. More preferably, the total thickness of all the sprayed reinforced layers 3 is 10-1200mm.

[0019] As a preference, the cryogenic insulation system of the marine cryogenic tank comprises 1-4 outer wrapping layers 4, which are outer steam and mechanical protection layers.

[0020] The cryogenic insulation system of the marine cryogenic tank of the utility model improves the strength and flexibility of the whole system by using the mold sheet, and meets the IMO A / B / C regulations.

[0021] The mold sheet is pressed from thin material and attached to the cryogenic liquid storage tank body before spraying the sprayed reinforced layer. The attachment of the pits on the mold sheet will generate a larger foam surface bonding area, and make the material more flexible in the cold zone near the cryogenic liquid storage tank body at low temperature. The mold layer can resist LN H3 / LNG / LEG / LPG / LH2 / LN2 or other cryogenic liquids with similar properties, and has stronger tensile strength than polyurethane foam, so when the mold sheet is first attached to the cryogenic liquid storage tank body with adhesive, it still has stronger system tensile strength than directly attaching / spraying polyurethane foam on the surface of the cryogenic liquid storage tank body. The channel space formed between the bottom surface of the mold sheet and the outer surface of the cryogenic liquid storage tank body can be used as a space for leakage discharge path of the cryogenic liquid storage tank body, leakage cargo detection path or circulation of other media, so as to conduct ship safety monitoring for A / B / C cryogenic liquid storage tank system according to IMO rules and regulations.

[0022] When the mold piece is made of transparent material, it can be seen during installation that it is fully adhered to the cryogenic liquid tank body and can easily follow the curvature of the cryogenic liquid tank body surface, such as the fillet and the knuckle. Once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid tank body, pressure strength tests can also be performed in the channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid tank body to see if any poorly fitted adhesive areas will cause the mold piece to crack or bulge outward.

[0023] The beneficial effects of the utility model are:

[0024] The low-temperature insulation system for the low-temperature tank of the ship is characterized by ingenious structure, the channel space formed between the bottom surface of the mold piece of the mold layer and the outer surface of the cryogenic liquid storage tank body forms an annular space through which the leaked gas of the tank body can flow, the leaked gas or inert gas of the tank body has a flow channel, the leaked medium can be detected, and the leaked medium is guided to a controlled position according to the requirements of the "IMO-B tank system", the low-temperature insulation system is particularly suitable for the cryogenic liquid storage tank body of LNH3 / LNG / LEG / LPG / LH2 / LN2, and can withstand a gas leakage amount of 200 l / h; moreover, the mold piece of the mold layer is pressed from a thin material with certain flexibility, the mold piece is easy to prepare, has good pressure-bearing strength and flexibility, the good pressure-bearing strength can greatly improve the pressure resistance of the system as a whole, the good flexibility makes the mold piece easy to be bent and deformed, and thus the mold piece is easy to be fixed to the cryogenic liquid storage tank body with a certain curvature on the surface and does not be raised on the side, the mold piece is convenient to follow the curvature of the surface of the cryogenic liquid storage tank body, such as a round corner and a steering knuckle, thus the situation that the mold piece is not bonded in place due to the raising can be avoided, the problem that the protection of the whole system is greatly reduced due to the easy bulging and explosion of the mold piece from the raised position where the bonding is not in place under pressure is avoided, and once it is verified that the mold layer is correctly adhered to the cryogenic liquid storage tank body in vision, the pressure strength test can be performed on the channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body to check whether any poor bonding area will cause the mold piece to be broken or protrude outward, so that the pressure bearing degree is detected in advance, and the hidden danger of insufficient pressure resistance is excluded; in addition, the recesses on the sheet make the mold piece have better tensile resistance, and thus the mold piece can better adapt to thermal expansion and cold contraction, so that the support stability of the mold piece under low-temperature extreme conditions is greatly improved; the spraying reinforcement layer adjacent to the mold piece is directly sprayed on the mold piece, so that the bonding force and the anti-peeling force between the spraying reinforcement layer and the mold layer are very strong, the pressure bearing force is very strong, the leaked pressure can be directly applied to the mold layer and any required thickness layer outside the mold layer during work, the cost is reduced, and the need for a traditional prefabricated plate joint is eliminated, the strength is good, the safety is high, and the manufacturing speed is fast. BRIEF DESCRIPTION OF DRAWINGS

[0025] For easy description, the utility model is described in detail by the following specific embodiments and drawings.

[0026] Figure 1 It is a three-dimensional structure schematic view of the embodiment of the utility model;

[0027] Figure 2 It is a front view structure schematic view of the embodiment of the utility model;

[0028] Figure 3is a perspective view of a mold sheet;

[0029] Figure 4 is a perspective view of another angle of a mold sheet. DETAILED DESCRIPTION

[0030] As Figures 1-4 shown, a low-temperature insulation system for a marine cryogenic tank, comprising a cryogenic liquid storage tank body 1, the outer side of which is provided with a mold layer 2, at least one layer of sprayed reinforcement layer 3 and at least one layer of outer wrapping layer 4 from inside to outside in turn, and a crack prevention mesh layer 5 is arranged between at least part of the sprayed reinforcement layer 3, the low-temperature insulation system for the marine cryogenic tank further comprises a gas recovery monitoring device, the mold layer 2 is composed of a plurality of mold sheets 6 arranged closely in turn, the mold sheet 6 is pressed from a thin material with a certain flexibility, the mold sheet 6 is in contact with the outer surface of the cryogenic liquid storage tank body 1 through the outer bottom surface of the uniformly pressed pit 7 thereon and is bonded and fixed by the adhesive 8, the channel space formed between the bottom surface of the mold sheet 6 and the outer surface of the cryogenic liquid storage tank body 1 is connected with the gas recovery monitoring device through a pipeline; one layer of sprayed reinforcement layer 3 adjacent to the mold sheet 6 is made by directly spraying on the mold sheet 6.

[0031] The depth of the pit 7 on the mold sheet 6 is less than 100 mm, and the thickness of the thin material used to make the mold sheet 6 is less than 10 mm, more preferably, the thickness of the thin material used to make the mold sheet 6 is 0.5 mm.

[0032] The mold sheet 6 is in sheet or roll form before being laid on the outer surface of the cryogenic liquid storage tank body 1, so as to facilitate application on a larger cryogenic liquid storage tank body.

[0033] A plurality of concentric ring wave patterns 11 are further pressed on the bottom of the pit 7 of the mold sheet 6, so as to make the adhesive 8 more firmly combined therewith.

[0034] The material of the thin material used to make the mold sheet 6 is plastic or metal. More preferably, the material of the thin material used to make the mold sheet 6 is PET, PVC or thin aluminum sheet, and other materials compatible with LNH3 / LNG / LEG / LPG / LH2 / LN2 or other materials with similar properties of the cryogenic liquid can also be used. Further, the material of the thin material used to make the mold sheet 6 is thin transparent plastic PVC.

[0035] The material of the thin material made into the mold piece 6 is transparent material, and the adhesive 8 is colored adhesive. When the mold piece 6 is transparent and the adhesive 8 is opaque, it is very convenient to directly confirm by naked eyes whether the bottom of the pit 7 on the mold piece 6 has been bonded in place with the outer surface of the cryogenic liquid storage tank body 1, thereby greatly ensuring the bonding strength and avoiding the problem that the bonding is not firm and is easy to bulge and burst when bearing pressure.

[0036] The bottom of the pit 7 is provided with a through hole 9, and the area of the through hole 9 is smaller than the area of the outer bottom surface of the pit 7 in contact with the outer surface of the cryogenic liquid storage tank body 1. By providing the through hole 9 at the bottom of the pit 7, three effects can be achieved: first, the adhesive 8 can partially pass through the through hole 9 into the inner surface of the pit 7, which can make the bonding between the mold piece 6 and the cryogenic liquid storage tank body 1 more firm; second, through the through hole 9, personnel can directly confirm by naked eyes whether the bonding is in place, thereby reducing the confirmation time and speeding up the installation; third, through the through hole 9, if the outer surface of the cryogenic liquid storage tank body 1 below the pit 7 is uneven or has pits, the excess gas or bubbles between the uneven or pit parts can be discharged outward through the through hole 9, so that the bonding can be in place and there is no air bubble, which ingeniously solves the problem that it is difficult to bond with the surface of the attached object when the outer surface of the cryogenic liquid storage tank body 1 is uneven, thereby ensuring the long-term stability of the bonding and greatly improving the pressure resistance of the mold layer 2.

[0037] The adhesive 8 is colored adhesive.

[0038] As a preferred embodiment, some shallow pits (not shown) with a depth less than that of the pit 7 are further provided around the pit 7 on the mold piece 6. When the mold piece 6 is in contact with and fixed to the outer surface of the cryogenic liquid storage tank body 1 through the deep pit 7, the shallow pits with a depth less than that of the pit 7 are not in contact with the outer surface of the cryogenic liquid storage tank body 1. Thus, through the existence of the shallow pits, the mold piece 6 has better tensile resistance, and can better adapt to thermal expansion and contraction, thereby greatly enhancing its support stability in extreme conditions.

[0039] A layer of polyurethane primer layer 10 is further coated on the outer surface of the cryogenic liquid storage tank body 1, and the outer bottom surface of the pit 7 of the mold piece 6 is attached to the polyurethane primer layer 10 through the adhesive 8.

[0040] The anti-crack mesh layer 5 is a polyurethane mesh, a glass mesh or a metal mesh, which is a crack stopper.

[0041] The sprayed reinforcement layer 3 is made of polyurethane sprayed foam.

[0042] The low-temperature insulation system of the marine cryogenic tank comprises 2-14 sprayed reinforcement layers 3.

[0043] As preferred, the low-temperature insulation system of the marine cryogenic tank comprises 1-4 outer layers 4, which are outer steam and mechanical protection layers.

[0044] The method for manufacturing the low-temperature insulation system of the marine cryogenic tank comprises the following process steps:

[0045] The thin material with certain flexibility is pressed to form a mold piece with a plurality of concaves uniformly arranged on the upper surface, and then the mold piece is fixed to the outer surface of the cryogenic liquid storage tank body by contacting the outer bottom surface of the concave with the outer surface of the cryogenic liquid storage tank body and through the adhesive fixing mode, the mold pieces arranged in sequence are finally combined to form a mold layer covering the outer surface of the cryogenic liquid storage tank body, and then the channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body is connected with the gas recovery monitoring device through a pipeline; then the sprayed reinforcement layer is directly sprayed on the upper surface of the mold piece, and finally the outer layer is manufactured outside the sprayed reinforcement layer.

[0046] When the outer bottom surface of the concave of the mold piece and the outer surface of the cryogenic liquid storage tank body are fixed by the adhesive, the adhesive is first rolled on the outer surface of the cryogenic liquid storage tank body or first dipped on the outer bottom surface of the concave to be contacted.

[0047] The low-temperature insulation system of the marine cryogenic tank of the utility model improves the strength and flexibility of the whole system by using the mold piece, and meets the IMO A / B / C regulations.

[0048] The mold piece is pressed from a thin material and adhered to the cryogenic liquid storage tank body before spraying the sprayed reinforcement layer, the adhesion of the concave on the mold piece will generate a larger foam surface bonding area, and the material will be more flexible in the cold zone near the cryogenic liquid storage tank body at low temperature. The mold layer can resist LN H3 / LNG / LEG / LPG / LH2 / CO2, and has stronger tensile strength than polyurethane foam, so when the mold piece is first adhered to the cryogenic liquid storage tank body with adhesive, it still has stronger system tensile strength than directly adhering / spraying polyurethane foam on the surface of the cryogenic liquid storage tank body. The channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body can be used as a space for leakage discharge path, leakage cargo detection path or circulation of other medium of the cryogenic liquid storage tank body, so as to conduct ship safety monitoring on the A / B / C cryogenic liquid storage tank system according to the IMO rules and regulations.

[0049] When the mold piece is made of transparent material, it can be seen that it is completely adhered to the cryogenic liquid storage tank body during the installation process, and can easily follow the curvature of the cryogenic liquid storage tank body surface, such as the fillet and knuckle. Once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid storage tank body, the channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body can also be tested for pressure strength to see if any poorly fitted adhesive areas will cause the mold piece to crack or bulge outward.

[0050] The marine low-temperature tank low-temperature insulation system has the advantages that the channel space formed between the bottom surface of the mold piece of the mold layer and the outer surface of the cryogenic liquid storage tank body forms an annular space through which the leaked gas of the tank body can flow, providing a flow channel for the leaked gas or inert gas of the tank body, which can be used to detect the leaked medium, and according to the requirements of the "imo-b tank system", the leaked medium is guided to a controlled position, and the system is particularly suitable for the cryogenic liquid storage tank body low-temperature insulation system of LNH3 / LNG / LEG / LPG / LH2 / LN2, etc. and can withstand a gas leakage of 200l / h. Moreover, the mold piece of the mold layer is pressed from a thin material with certain flexibility, which is not only easy to prepare, but also has good pressure strength and flexibility. The good pressure strength can greatly improve the overall pressure resistance of the system, and the good flexibility makes it easy to bend and deform, so it is easy to install and fix with the cryogenic liquid storage tank body which usually has a certain arc on the surface and does not lift on the edge. It is convenient to follow the curvature of the cryogenic liquid storage tank body surface, such as the fillet and knuckle, so as to avoid the situation that the bonding is not in place due to lifting. In addition, once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid storage tank body, the channel space formed between the bottom surface of the mold piece and the outer surface of the cryogenic liquid storage tank body can also be tested for pressure strength to see if any poorly fitted adhesive areas will cause the mold piece to crack or bulge outward, so as to detect the pressure bearing degree in advance and eliminate the risk of insufficient pressure resistance. In addition, because the sheet has a pit, the wrinkles relative to the pure plane can make the mold piece have better tensile resistance, and thus it can better adapt to thermal expansion and contraction, thereby greatly enhancing the support stability in low-temperature extreme conditions. The spray reinforcement layer adjacent to the mold piece is directly sprayed on the mold piece, so that the bonding force and anti-peeling force between the spray reinforcement layer and the mold layer are very strong, and thus the pressure bearing force is very strong. In work, the leaked pressure can be directly applied to the mold layer and any required thickness layer outside the layer, which can reduce the cost and eliminate the need for traditional prefabricated plate joints. Not only is the strength good and the safety high, but also the manufacturing speed is fast.

[0051] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement not through creative labor should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. A cryogenic insulation system for marine cryogenic tanks, comprising a cryogenic liquid storage tank body (1), characterized in that, The outer side of the cryogenic liquid storage tank body (1) is provided with a mold layer (2), at least one sprayed reinforcement layer (3) and at least one outer cladding layer (4) from the inside out. At least some of the sprayed reinforcement layers (3) are provided with a crack-resistant mesh layer (5). The marine cryogenic tank cryogenic insulation system also includes a gas recovery monitoring device. The mold layer (2) is composed of several mold pieces (6) arranged in a close sequence. The mold pieces (6) are made of thin material with a certain degree of flexibility. The mold pieces (6) are in contact with the outer surface of the cryogenic liquid storage tank body (1) through the outer bottom surface of the uniformly pressed pits (7) on them and are bonded and fixed by adhesive (8). The channel space formed between the bottom surface of the mold pieces (6) and the outer surface of the cryogenic liquid storage tank body (1) is connected to the gas recovery monitoring device through a pipeline. The sprayed reinforcement layer (3) adjacent to the mold pieces (6) is made by directly spraying on the mold pieces (6).

2. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The depth of the pit (7) on the mold piece (6) is less than 100 mm, the thickness of the thin material used to make the mold piece (6) is less than 10 mm, and the material of the thin material used to make the mold piece (6) is plastic or metal.

3. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The thin material used to make the mold sheet (6) is made of PET, PVC, thin aluminum sheet or other materials compatible with LNH3 / LNG / LEG / LPG / LH2 / LN2 or cryogenic liquids with similar properties.

4. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The mold sheet (6) is in sheet or roll form before being laid on the outer surface of the cryogenic liquid storage tank body (1).

5. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The bottom of the recess (7) of the mold piece (6) is also pressed with several concentric ring wave patterns (11).

6. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The thin material used to make the mold sheet (6) is a transparent material, and the adhesive (8) is a colored adhesive.

7. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The bottom of the pit (7) is provided with a through hole (9), and the area of ​​the through hole (9) is smaller than the area of ​​the contact surface between the outer bottom surface of the pit (7) and the outer surface of the cryogenic liquid storage tank body (1).

8. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The mold piece (6) also has some shallow pits around the recess (7) that are not as deep as the recess (7).

9. The marine cryogenic tank cryogenic insulation system according to claim 1, characterized in that, The sprayed reinforcement layer (3) is made of polyurethane spray foam, and the marine cryogenic tank cryogenic insulation system includes 2-14 sprayed reinforcement layers (3), with a total thickness of 10-1200mm for all sprayed reinforcement layers (3).

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