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

Abstract

The invention discloses a marine low-temperature tank low-temperature insulation and heat preservation system 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. Through the arrangement of the mold layer, the preparation is easy, the bearing strength and the flexibility are good, and the safety is high.

Description

Technical Field

[0001] The present invention belongs to a cryogenic liquid storage system, and particularly relates to a cryogenic insulation and heat preservation system for a marine cryogenic tank. Background Art

[0002] For storage tanks of cryogenic liquids such as liquefied natural gas, during transportation and use, once an accident occurs or cracks are generated in the tank body due to fatigue, it is easy to cause leakage of the liquid or gas in the tank. This part of the gas will be directly discharged, which will not only cause waste of gas, but also may lead to environmental pollution and safety problems. Therefore, people have been trying to find better solutions.

[0003] In the prior art, there are some solutions. For example, between the tank body and the outer protective layer of the tank, a ring-shaped space for the leakage of other substances to flow through is set by arranging blocks at intervals on the surface of the tank body to leave a channel, and then a gas detection device is connected to the ring-shaped space to detect the leaked gas. However, in such a method, the fixing process of the blocks is troublesome, time-consuming and laborious, the installation process is slow, and the presence of the blocks does not enhance the protection of the outer protective layer of the tank, so that the problem that the existing outer protective layer of the tank is prone to bulging due to excessive pressure cannot be well improved. Therefore, people hope to find a cryogenic insulation and heat preservation system for a marine cryogenic tank that can reduce the pressure of the outer protective layer of the tank, has a fast manufacturing speed and low cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a cryogenic insulation and heat preservation system for a marine cryogenic tank with a fast manufacturing speed, low cost, good pressure-bearing capacity and good adaptability.

[0005] The present invention is achieved by the following technical solutions: A cryogenic insulation and heat preservation system for a marine cryogenic tank, comprising a cryogenic liquid storage tank body 1. On the outside of the cryogenic liquid storage tank body 1, from the inside to the outside, there are sequentially arranged a mold layer 2, at least one spraying enhancement layer 3 and at least one outer layer 4. Between at least some of the spraying enhancement layers 3, there is arranged a crack prevention mesh layer 5. The cryogenic insulation and heat preservation system for a marine cryogenic tank further comprises a gas recovery and monitoring device. The mold layer 2 is composed of a number of mold pieces 6 arranged closely in sequence. The mold pieces 6 are pressed from a thin material with a certain flexibility. The outer bottom surface of the concave pits 7 uniformly pressed on the mold pieces 6 is in contact with the outer surface of the cryogenic liquid storage tank body 1 and is bonded and fixed through an 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 and monitoring device through a pipeline; The adjacent spraying enhancement layer 3 to the mold piece 6 is directly sprayed on the mold piece 6 and formed.

[0006] Preferably, 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.

[0007] Preferably, 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.

[0008] Preferably, a plurality of concentric annular wavy patterns 11 are pressed on the bottom of the concave pit 7 of the mold sheet 6 so as to facilitate the adhesive 8 to be more firmly combined therewith.

[0009] Preferably, the thin material of the mold sheet 6 is made of plastic or metal. More preferably, the thin material of the mold sheet 6 is made of PET, PVC or thin aluminum sheet, and can also be made of other materials compatible with LNH3 / LNG / LEG / LPG / LH2 / LN2 or cryogenic liquids with similar properties. Further, the thin material of the mold sheet 6 is made of thin transparent plastic PVC.

[0010] Preferably, the thin material used to make the mold sheet 6 is a transparent material, 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 with the naked eye whether the bottom of the pit 7 on the mold sheet 6 has been bonded to the outer surface of the deep-cold liquid storage tank body 1, thereby greatly ensuring the strength of the bond and avoiding the problem of bulging and bursting from this place when under pressure due to loose bonding.

[0011] Preferably, a through hole 9 is provided on the bottom of the pit 7 , 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 . By setting a through hole 9 at the bottom of the pit 7, three functions can be achieved: first, the adhesive 8 can partially enter the inner surface of the pit 7 through the through hole 9, so that the mold sheet 6 as a whole can be more firmly bonded to the deep cold liquid storage tank body 1; second, through the through hole 9, personnel can quickly confirm with the naked eye whether the bonding is smooth and in place, so as to reduce the confirmation time and speed up the installation speed; third, through the setting of the through hole 9, if the outer surface of the deep cold liquid storage tank body 1 below the pit 7 is uneven, has pits, etc., during bonding, the excess gas and bubbles in the uneven places or pits between the two can be discharged to the outside through the through hole 9, so that the bonding can be effectively bonded to the surface without leaving cavitations, which cleverly solves the problem that it is difficult to effectively bond with the surface of the attached object when the outer surface of the deep cold liquid storage tank body 1 is uneven, ensures the long-term stability of the bonding, and greatly improves the compressive strength of the mold layer 2.

[0012] More preferably, the adhesive 8 is a colored adhesive.

[0013] Preferably, some shallow pits with a depth less than that of the pits 7 are also pressed around the pits 7 on the die sheet 6. When the die 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 greater depth, these shallow pits with a depth less than that of the pits 7 do not come into contact with the outer surface of the cryogenic liquid storage tank body 1. Thus, due to the existence of these shallow pits, the die sheet 6 can be made more tensile, and further can better adapt to the thermal expansion and contraction situation, thereby greatly enhancing its support stability in extreme cases.

[0014] Preferably, a layer of 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 pit 7 of the die sheet 6 is attached to the polyurethane primer layer 10 through an adhesive 8.

[0015] Preferably, the anti-crack net layer 5 is a polyurethane net, a glass net or a metal net and serves as a crack stopper.

[0016] Preferably, the spray strengthening layer 3 is made of sprayed polyurethane foam.

[0017] Preferably, the marine cryogenic tank cryogenic insulation and heat preservation system includes 2 - 14 layers of spray strengthening layers 3. More preferably, the total thickness of all the spray strengthening layers 3 is 10 - 1200 mm.

[0018] Preferably, the marine cryogenic tank cryogenic insulation and heat preservation system includes 1 - 4 layers of outer cladding layers 4, and the outer cladding layer 4 is an outer steam and mechanical protection layer.

[0019] The present invention also provides a manufacturing method for the above-mentioned marine cryogenic tank cryogenic insulation and heat preservation system, and the technological steps include the following: Press a thin material with a certain flexibility to form a die sheet uniformly provided with a plurality of pits on the upper surface, and then fix the die sheet to the outer surface of the cryogenic liquid storage tank body in such a way that the outer bottom surface of the pit contacts the outer surface of the cryogenic liquid storage tank body and is fixed through an adhesive. The die sheets arranged in sequence and closely are finally combined to form a die layer covering the outer surface of the cryogenic liquid storage tank body. Then, connect the channel space formed between the bottom surface of the die sheet and the outer surface of the cryogenic liquid storage tank body to a gas recovery monitoring device through a pipeline; then directly spray a spray strengthening layer on the upper surface of the die sheet, and finally make an outer cladding layer outside the spray strengthening layer.

[0020] Preferably, when the outer bottom surface of the pit of the die sheet is adhesively fixed to the outer surface of the cryogenic liquid storage tank body through an adhesive, the adhesive is first roll-coated on the outer surface of the cryogenic liquid storage tank body or first dip-coated on the outer bottom surface of the pit that will be in contact therewith.

[0021] The cryogenic insulation and heat preservation system for marine cryogenic tanks of the present invention improves the strength and flexibility of the entire system by using die pieces and complies with IMO A / B / C regulations.

[0022] The die pieces are pressed from thin materials and adhered to the cryogenic liquid storage tank body before spraying the spray-enhanced layer. The adhesion of the pits on the die pieces will generate a larger foam surface adhesion area and make the material more flexible in the cold area near the cryogenic liquid storage tank body at low temperatures. The die layer can resist LNH3 / LNG / LEG / LPG / LH2 / LN2 or cryogenic liquids with similar properties to them, and has a higher tensile strength than polyurethane foam. Therefore, when the die pieces are first adhered to the cryogenic liquid storage tank body with an adhesive, it still has a stronger system tensile strength than directly adhering / spraying only polyurethane foam on the surface of the cryogenic liquid storage tank body. The channel space formed between the bottom surface of the die piece and the outer surface of the cryogenic liquid storage tank body can be used as a leakage discharge path for the cryogenic liquid storage tank body, a leakage cargo detection path, or a space for circulating other media to pass through, so as to conduct ship safety monitoring on the A / B / C cryogenic liquid storage tank system according to IMO rules and regulations.

[0023] When the die piece is made of a transparent material, it can be seen that it is completely adhered to the cryogenic liquid storage tank body during installation and can easily follow the curvature of the surface of the cryogenic liquid storage tank body, such as fillets and knuckles. Once it is verified that the die layer is visually correctly adhered to the cryogenic liquid storage tank body, a pressure strength test can also be carried out in the channel space formed between the bottom surface of the die piece and the outer surface of the cryogenic liquid storage tank body to check whether any poorly adhered bonding areas will cause the die piece to break or bulge outwards.

[0024] The beneficial effects of the present invention are: The cryogenic insulation and heat preservation system for marine cryogenic tanks of the present invention has a clever structure. The channel space formed between the bottom surface of the mold pieces 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 gas leaked from the tank body or inert gas. The leaked medium can be detected and guided to a controlled position according to the requirements of the "IMO-B type tank system". It is particularly suitable for the cryogenic insulation and heat preservation system of cryogenic liquid storage tank bodies such as LNH3 / LNG / LEG / LPG / LH2 / LN2, etc., and can withstand a gas leakage rate of 200 l / h. Moreover, the mold pieces that make up the mold layer are pressed from thin materials with a certain flexibility. They are not only easy to prepare, but also have good pressure-bearing strength and flexibility. Their good pressure-bearing strength can greatly improve the overall compressive resistance of the system, and their good flexibility makes them easy to be bent and deformed, and easy to be installed and fixed to the cryogenic liquid storage tank body with a certain arc on the surface without warping on the edge, facilitating following the curvature of the surface of the cryogenic liquid storage tank body, such as fillets and steering knuckles. This can avoid the situation of poor adhesion due to warping, that is, it also avoids the problem that the protection force of the whole system is greatly reduced due to bulging and bursting easily from the warped part with poor adhesion when under pressure. And once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid storage tank body, a pressure strength test can also be carried out in 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 poorly bonded areas will cause the mold piece to rupture or bulge outwards, thereby detecting the pressure tolerance in advance and eliminating the hidden danger of insufficient compressive resistance. In addition, due to the pits on the sheet material, these wrinkles relative to the pure flat surface can make the whole mold piece more stretch-resistant, and then make it better adapt to the thermal expansion and contraction situation, thereby greatly enhancing its support stability in extreme low-temperature conditions. And a spray-enhanced 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-enhanced layer and the mold layer are very strong, and thus the bearing pressure is very strong. During operation, the leaked pressure can be directly applied to the mold layer and any required thickness layer outside this layer, which can reduce costs and eliminate the need for traditional prefabricated panel joints. It not only has good strength and high safety, but also has a fast manufacturing speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] For ease of explanation, the present invention will be described in detail by the following specific embodiments and accompanying drawings.

[0026] Figure 1 Schematic three-dimensional structure diagram of an embodiment of the present invention; Figure 2 Schematic front view structure diagram of an embodiment of the present invention; Figure 3 Schematic three-dimensional structure diagram of the perspective state of the mold piece; Figure 4Schematic diagram of the three-dimensional structure of another angle of the mold sheet. Detailed implementation manners

[0027] As Figures 1-4 shown, a cryogenic insulation and heat preservation system for a marine cryogenic tank includes a cryogenic liquid storage tank body 1. On the outer side of the cryogenic liquid storage tank body 1, from inside to outside in sequence, there are arranged a mold layer 2, at least one layer of spray enhancement layer 3 and at least one layer of outer wrap layer 4. Between at least some of the spray enhancement layers 3, there is arranged a crack prevention mesh layer 5. The cryogenic insulation and heat preservation system for the marine cryogenic tank further includes a gas recovery monitoring device. The mold layer 2 is composed of a plurality of mold sheets 6 arranged closely in sequence. The mold sheet 6 is pressed from a thin material with a certain flexibility. The outer bottom surface of the concave pits 7 uniformly pressed on the mold sheet 6 is in contact with the outer surface of the cryogenic liquid storage tank body 1 and is bonded and fixed through an 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 to the gas recovery monitoring device through a pipeline; One layer of spray enhancement layer 3 adjacent to the mold sheet 6 is directly sprayed on the mold sheet 6 to be made.

[0028] The depth of the concave pits 7 on the mold sheet 6 is less than 100 mm, and the thickness of the thin material for making the mold sheet 6 is less than 10 mm. More preferably, the thickness of the thin material for making the mold sheet 6 is 0.5 mm.

[0029] Before being laid on the outer surface of the cryogenic liquid storage tank body 1, the mold sheet 6 is in a sheet shape or a roll shape, so as to be applied to a larger cryogenic liquid storage tank body.

[0030] On the bottom of the concave pits 7 of the mold sheet 6, there are also pressed several concentric circular corrugations 11, so as to make the adhesive 8 combine with it more firmly.

[0031] The material of the thin material for making the mold sheet 6 is plastic or metal. More preferably, the material of the thin material for making the mold sheet 6 is PET, PVC or thin aluminum sheet, and it can also be made of other materials compatible with cryogenic liquids such as LNH3 / LNG / LEG / LPG / LH2 / LN2 or having similar characteristics to them. Further, the material of the thin material for making the mold sheet 6 is thin transparent plastic PVC.

[0032] The material of the thin material for making the mold sheet 6 is a transparent material, 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 the naked eye whether the bottom of the concave pits 7 on the mold sheet 6 has been bonded to the outer surface of the cryogenic liquid storage tank body 1 in place, thereby greatly ensuring the bonding strength and avoiding the problem that it is easy to bulge and burst from here when bearing pressure due to insufficient bonding.

[0033] A through hole 9 is provided on the bottom of the pit 7, 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. By providing the through hole 9 at the bottom of the pit 7, three functions can be achieved: First, part of the adhesive 8 can enter the inner surface of the pit 7 through the through hole 9, so that the overall bonding between the mold piece 6 and the cryogenic liquid storage tank body 1 can be more firm; Second, through this through hole 9, personnel can directly and quickly confirm with the naked eye whether the bonding is compliant and in place, so as to reduce the confirmation time and speed up the installation speed; Third, through the setting of this through hole 9, if the outer surface of the cryogenic liquid storage tank body 1 below the pit 7 is uneven or has holes, etc., when bonding, the excess gas and bubbles between the uneven or pitted parts can be discharged through this through hole 9, so that the bonding can be in actual contact surface to surface and no air bubbles are left, skillfully solving the problem that it is difficult to actually bond the surface of the cryogenic liquid storage tank body 1 with its attached object surface when the outer surface is uneven, ensuring the long-term stability of the bonding, and greatly improving the compressive capacity of the mold layer 2.

[0034] The adhesive 8 is a colored adhesive.

[0035] Preferably, some shallow pits (not shown) with a depth less than that of the pit 7 are pressed 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, these shallow pits with a depth less than that of the pit 7 do not contact the outer surface of the cryogenic liquid storage tank body 1. Thus, due to the existence of these shallow pits, the mold piece 6 can be made more tensile-resistant, and thus it can better adapt to the thermal expansion and contraction situation, thereby greatly enhancing its support stability in extreme cases.

[0036] A layer of 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 pit 7 of the mold piece 6 is attached to the polyurethane primer layer 10 through the adhesive 8.

[0037] The anti-crack mesh layer 5 is a polyurethane mesh, a glass mesh or a metal mesh, as a crack stopper.

[0038] The sprayed strengthening layer 3 is made of polyurethane spray foam.

[0039] The marine cryogenic tank cryogenic insulation and heat preservation system includes 2 - 14 layers of sprayed strengthening layers 3. The total thickness of all the sprayed strengthening layers 3 is 10 - 1200 mm.

[0040] Preferably, the marine cryogenic tank cryogenic insulation and heat preservation system includes 1 - 4 layers of outer cladding layers 4, and the outer cladding layer 4 is an outer steam and mechanical protection layer.

[0041] The manufacturing method of the above-mentioned marine cryogenic tank cryogenic insulation and heat preservation system includes the following technological steps: Press a thin material with a certain flexibility to form a mold sheet with a number of pits evenly distributed on the upper surface. Then, fix the mold sheet to the outer surface of the cryogenic liquid storage tank body by contacting the outer bottom surface of the pits with the outer surface of the cryogenic liquid storage tank body and fixing it with an adhesive. The sequentially and closely arranged mold sheets are finally combined to form a mold layer covering the outer surface of the cryogenic liquid storage tank body. Then, connect the channel space formed between the bottom surface of the mold sheet and the outer surface of the cryogenic liquid storage tank body to the gas recovery monitoring device through a pipeline. Then, directly spray a spray reinforcement layer on the upper surface of the mold sheet, and finally make an outer covering layer outside the spray reinforcement layer.

[0042] When the outer bottom surface of the pit of the mold sheet is adhesively fixed to the outer surface of the cryogenic liquid storage tank body with an adhesive, the adhesive is first roll-coated on the outer surface of the cryogenic liquid storage tank body or first dip-coated on the outer bottom surface of the pit that will come into contact with it.

[0043] The marine cryogenic tank cryogenic insulation and heat preservation system of the present invention improves the strength and flexibility of the entire system by using mold sheets and complies with IMO A / B / C regulations.

[0044] The mold sheet is made by pressing a thin material and is adhered to the cryogenic liquid storage tank body before spraying the spray reinforcement layer. The adhesion of the pits on the mold sheet will generate a larger foam surface bonding area and make the material more flexible in the cold area near the cryogenic liquid storage tank body at low temperatures. The mold layer can resist LNH3 / LNG / LEG / LPG / LH2 / CO2 and has a higher tensile strength than polyurethane foam. Therefore, when the mold sheet is first adhered to the cryogenic liquid storage tank body with an adhesive, it still has a higher 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 sheet and the outer surface of the cryogenic liquid storage tank body can be used as a leakage discharge path, a leakage cargo detection path, or a space for circulating other media through 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 IMO rules and regulations.

[0045] When the mold sheet is made of a 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 surface of the cryogenic liquid storage tank body, such as fillets and knuckles. Once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid storage tank body, a pressure strength test can also be carried out in the channel space formed between the bottom surface of the mold sheet and the outer surface of the cryogenic liquid storage tank body to check whether any poorly adhered bonding areas will cause the mold sheet to break or bulge outwards.

[0046] The cryogenic insulation and heat preservation system for marine cryogenic tanks of the present invention has a clever structure. The channel space formed between the bottom surface of the mold pieces 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 gas leaked from the tank body or inert gas. It can be used to detect the leakage medium and, in accordance with the requirements of the "IMO-B type tank system", guide it to a controlled position. It is particularly suitable for the cryogenic insulation and heat preservation system of the cryogenic liquid storage tank body such as LNH3 / LNG / LEG / LPG / LH2 / LN2, etc., and can withstand a gas leakage rate of 200 l / h. Moreover, the mold pieces forming the mold layer are pressed from thin materials with a certain flexibility. They are not only easy to prepare, but also have good pressure-bearing strength and flexibility. Their good pressure-bearing strength can greatly improve the overall compressive resistance of the system, and their good flexibility makes it easier to be bent and deformed, and thus easier to be installed and fixed to the cryogenic liquid storage tank body with a certain curvature on the surface without warping at the edges, facilitating following the curvature of the surface of the cryogenic liquid storage tank body, such as fillets and steering knuckles. This can avoid the situation of poor adhesion due to warping, that is, it can also avoid the problem that the protection force of the entire system is greatly reduced due to bulging and bursting easily from the warped part with poor adhesion when under pressure. And once it is verified that the mold layer is visually correctly adhered to the cryogenic liquid storage tank body, a pressure strength test can also be carried out in 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 poorly adhered bonding areas will cause the mold piece to rupture or bulge outwards, thereby detecting the pressure tolerance in advance and eliminating the hidden danger of insufficient compressive resistance. In addition, due to the pits on the sheet material, these wrinkles relative to the pure flat surface can make the whole mold piece more stretch-resistant, and then make it better adapt to the thermal expansion and contraction situation, thereby greatly enhancing its support stability in extreme low-temperature conditions. And a spray strengthening layer adjacent to the mold piece is directly sprayed on the mold piece, which can make the bonding force and anti-peeling force between the spray strengthening layer and the mold layer very strong, and thus the bearing pressure is very strong. During operation, the leaked pressure can be directly applied to the mold layer and any required thickness layer outside this layer, which can reduce costs and eliminate the need for traditional prefabricated panel joints. It not only has good strength and high safety, but also has a fast manufacturing speed.

[0047] As described above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be thought of without creative work should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A cryogenic insulation and heat preservation system for a marine cryogenic tank, comprising a cryogenic liquid storage tank body (1), characterized in that, On the outer side of the cryogenic liquid storage tank body (1), from the inside to the outside, there are successively arranged a mold layer (2), at least one spray-enhanced layer (3), and at least one outer wrapping layer (4). Between at least some of the spray-enhanced layers (3), there is arranged a crack prevention mesh layer (5). The marine cryogenic tank cryogenic insulation and heat preservation system further includes a gas recovery monitoring device. The mold layer (2) is composed of a number of mold pieces (6) arranged closely in sequence. The mold pieces (6) are pressed from a thin material with a certain flexibility. The outer bottom surface of the mold pieces (6) contacts the outer surface of the cryogenic liquid storage tank body (1) through the concave pits (7) uniformly pressed thereon and is bonded and fixed through an 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 spray-enhanced layer (3) adjacent to the mold pieces (6) is made by directly spraying on the mold pieces (6).

2. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein The depth of the concave pits (7) on the mold pieces (6) is less than 100 mm, the thickness of the thin material for making the mold pieces (6) is less than 10 mm, and the material of the thin material for making the mold pieces (6) is plastic or metal.

3. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein Before being laid on the outer surface of the cryogenic liquid storage tank body (1), the mold pieces (6) are in sheet or roll form, so as to be applied to a larger cryogenic liquid storage tank body.

4. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein, On the bottom of the concave pits (7) of the mold pieces (6), there are also pressed several concentric circular corrugations (11) to facilitate a firmer combination with the adhesive (8).

5. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein The material of the thin material for making the mold pieces (6) is a transparent material, and the adhesive (8) is a colored adhesive.

6. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein On the bottom of the concave pits (7), there are through holes (9), and the area of the through holes (9) is smaller than the area of the contact surface between the outer bottom surface of the concave pits (7) and the outer surface of the cryogenic liquid storage tank body (1).

7. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein, On the mold pieces (6), there are also pressed some shallow pits around the concave pits (7) with a depth less than that of the concave pits (7).

8. The cryogenic insulation and heat preservation system for marine cryogenic tanks according to claim 1, wherein, The spray-enhanced layer (3) is made by spraying and foaming polyurethane. The marine cryogenic tank cryogenic insulation and heat preservation system includes 2 - 14 spray-enhanced layers (3), and the total thickness of all the spray-enhanced layers (3) is 10 - 1200 mm.

9. The manufacturing method of the cryogenic insulation and heat preservation system for marine cryogenic tanks according to any one of claims 1-8, characterized in that, The technological steps include the following: pressing a thin material with a certain flexibility to form a mold piece with a number of concave pits uniformly on it, then fixing the mold piece to the outer surface of the cryogenic liquid storage tank body in such a way that the outer bottom surface of the concave pits contacts the outer surface of the cryogenic liquid storage tank body and is fixed through an adhesive. The mold pieces arranged closely in sequence finally combine to form a mold layer covering the outer surface of the cryogenic liquid storage tank body. Then, the channel space formed between the bottom surface of the mold pieces and the outer surface of the cryogenic liquid storage tank body is connected to the gas recovery monitoring device through a pipeline; then, a spray-enhanced layer is directly sprayed on the upper surface of the mold piece, and finally, an outer wrapping layer is made outside the spray-enhanced layer.

10. The manufacturing method according to claim 9, characterized in that, When the outer bottom surface of the pit of the mold piece is adhesively fixed to the outer surface of the cryogenic liquid storage tank body through an adhesive, the adhesive is first roll-coated on the outer surface of the cryogenic liquid storage tank body or first dip-coated on the outer bottom surface of the pit that will be in contact with it.

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