Cooling tank

Abstract

This utility model discloses a cold-insulating tank, relating to the field of cryogenic storage tank technology. The cold-insulating tank includes an outer tank, an inner tank, and glass bricks. A first insulation zone is formed between the bottom of the outer tank and the bottom of the inner tank in a vertical direction. Multiple glass bricks are laid horizontally to form an insulation layer, and multiple insulation layers are vertically arranged within the first insulation zone. Gaps exist between two adjacent glass bricks within the same insulation layer, and the gaps between adjacent insulation layers are staggered. Within the same insulation layer, the width of the gap between two adjacent glass bricks is less than or equal to 2 mm, and the height difference between any two glass bricks in the vertical direction is less than or equal to 2 mm. The staggered distance between the gaps between adjacent insulation layers is greater than or equal to 100 mm. The technical solution provided by this utility model achieves a better cold-insulating effect by arranging the glass bricks in each insulation layer tightly and neatly, and by staggering the gaps within each insulation layer.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic storage tank technology, and in particular to a cold storage tank. Background Technology

[0002] With the development of the petrochemical industry, liquefied hydrocarbons and liquefied natural gas (LNG), as basic chemical raw materials and new fuels, are becoming increasingly important. Domestic and international markets are seeing a gradual increase in demand for liquefied hydrocarbon and LNG storage facilities, particularly for large cryogenic storage tanks.

[0003] Cryogenic storage tanks consist of an outer tank, an inner tank, and an insulation structure between the inner and outer tanks. The insulation layers of a cryogenic storage tank include a top insulation layer, a wall insulation layer, and a bottom insulation layer. The bottom insulation layer, in particular, must not only support the structural weight of the tank itself and the weight of the medium inside, but also possess highly efficient thermal insulation performance.

[0004] Currently, glass bricks are used to fill the space between the bottom of the inner tank and the bottom of the outer tank. When glass bricks are arranged, there will inevitably be gaps. If the arrangement is not tight enough and the gaps are too large, or if the gaps between the upper and lower layers are connected, heat may be transferred through the gaps, forming thermal bridges and reducing the overall insulation effect. Utility Model Content

[0005] The main purpose of this invention is to provide a cold storage container that improves the cold storage effect.

[0006] To achieve the above objectives, the present invention proposes a cold storage tank for containing liquefied natural gas, comprising: an outer tank, an inner tank, and glass blocks. The outer tank has a first cavity; the inner tank is installed within the first cavity and has a second cavity for containing liquefied natural gas; a first insulation zone is formed between the bottom of the outer tank and the bottom of the inner tank in the vertical direction; multiple glass blocks are laid horizontally to form an insulation layer, and the insulation layer is arranged in multiple layers in the vertical direction and fills the first insulation zone; there is a gap between two adjacent glass blocks in the same insulation layer, and the gaps in two adjacent insulation layers are staggered; wherein, in the same insulation layer, the gap width between two adjacent glass blocks is less than or equal to 2 mm, and the height difference between any two glass blocks in the vertical direction is less than or equal to 2 mm; the staggered distance between the gaps in two adjacent insulation layers is greater than or equal to 100 mm.

[0007] In one embodiment, the cold storage tank further includes glass wool, which is disposed between the outer periphery of the insulation layer and the inner wall of the outer tank within the first insulation zone.

[0008] In one embodiment, a plain concrete leveling layer is provided between the bottom of the outer tank and the insulation layer, and the side of the plain concrete leveling layer facing the inner tank is coated with cold primer.

[0009] In one embodiment, the cold storage tank further includes a support ring and an asphalt felt. The support ring is disposed in the first insulation zone, the glass brick is located on the periphery of the support ring, and the asphalt felt is disposed between the plain concrete leveling layer and the insulation layer, between the support ring and the insulation layer, and between two adjacent insulation layers.

[0010] In one embodiment, the asphalt felt comprises multiple sheets, with adjacent sheets of the asphalt felt at least partially overlapping, and the width of the overlapping portion being greater than or equal to 25 millimeters.

[0011] In one embodiment, a second insulation zone is formed between the outer tank sidewall and the inner tank sidewall; the cold storage tank also includes an elastic felt disposed in the second insulation zone and laid on the outer sidewall of the inner tank.

[0012] In one embodiment, the elastic felt is provided in multiple layers, and the cold storage container further includes a fixing nail, the fixing nail having a rod and a head, the head being connected to one end of the rod, the rod having multiple layers of the elastic felt inserted through it, the other end of the rod being fixedly connected to the inner sidewall of the container, the multiple layers of elastic felt being limited and installed between the head and the inner sidewall of the container, and the elastic felt being compressed in the radial direction of the container.

[0013] In one embodiment, the cold storage container further includes:

[0014] A glass cloth is placed in the second insulation zone and laid on the inner wall of the outer tank, forming a filling area between the glass cloth and the elastic felt;

[0015] Expanded perlite is used to fill the filling area;

[0016] Expanded perlite is used to fill the gaps in the expanded perlite.

[0017] In one embodiment, a third insulation zone is formed between the top of the outer tank and the top of the inner tank in the vertical direction; the cold storage tank also includes a glass fiber mat, which is laid on the outer side wall of the inner tank in the third insulation zone, and its thickness is greater than or equal to 900 mm.

[0018] In one embodiment, multiple pieces of the fiberglass mat are disposed away from the inner tank side, with adjacent pieces of the fiberglass mat at least partially overlapping, and the overlap is sealed with aluminum foil tape.

[0019] The technical solution of this utility model reduces heat transfer through the gaps by arranging the glass bricks in each insulation layer tightly and neatly, and by staggering the gaps in each insulation layer, thereby achieving a better cold insulation effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the bottom structure of an embodiment of the cold storage tank provided by this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the cold storage tank at the top.

[0023] Explanation of icon numbers:

[0024] 100. Cold storage tank; 1. Outer tank; 2. Inner tank; 3. Multiple glass bricks; 4. Glass wool; 5. Plain concrete leveling layer; 6. Support ring; 7. Asphalt felt; 8. Elastic felt; 9. Fixing nail; 10. Glass cloth; 11. Expanded perlite; 12. Fiberglass felt.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Currently, glass bricks are used to fill the space between the bottom of the inner tank and the bottom of the outer tank. When glass bricks are arranged, there will inevitably be gaps. If the arrangement is not tight enough and the gaps are too large, or if the gaps between the upper and lower layers are connected, heat may be transferred through the gaps, forming thermal bridges and reducing the overall insulation effect.

[0030] This utility model proposes a cold storage container.

[0031] Please see Figure 1 In one embodiment of this utility model, the cold storage tank 100 for containing liquefied natural gas includes: an outer tank 1, an inner tank 2, and glass bricks. The outer tank 1 has a first cavity; the inner tank 2 is installed in the first cavity and has a second cavity for containing liquefied natural gas. A first insulation zone is formed between the bottom of the outer tank 1 and the bottom of the inner tank 2 in the vertical direction; multiple glass bricks 3 are laid horizontally to form an insulation layer, and the insulation layer is arranged in multiple layers in the vertical direction and fills the first insulation zone; there is a gap between two adjacent glass bricks in the same insulation layer, and the gaps in two adjacent insulation layers are staggered; wherein, in the same insulation layer, the gap width between two adjacent glass bricks is less than or equal to 2 mm, and the height difference between any two glass bricks in the vertical direction is less than or equal to 2 mm; the staggered distance A between the gaps in two adjacent insulation layers is... Figure 1 (As shown in the figure) greater than or equal to 100 mm.

[0032] Liquefied natural gas needs to be stored at extremely low temperatures, typically around -162°C. Therefore, the design of the cold storage tank 100 must prioritize insulation performance to prevent heat transfer that could lead to LNG vaporization. Due to the large volume and weight of the cold storage tank 100, the space between the bottom of the inner tank 2 and the bottom of the outer pipe needs to be filled with a material that provides both good insulation and structural support.

[0033] This invention achieves bottom insulation by filling the space between the bottom of the inner tank 2 and the bottom of the outer pipe with glass bricks. Since the glass bricks need to withstand significant pressure, to prevent damage to the internal glass bricks and reduced insulation performance, it is crucial to ensure the glass bricks are laid flat. Multiple glass bricks 3 are laid horizontally to form an insulation layer, with multiple layers vertically filling the first insulation zone. Within the same insulation layer, the vertical height difference between any two glass bricks is less than or equal to 2 mm. If poor contact is found at the bottom during glass brick laying, local application of inorganic powder can be used to level the surface and ensure flatness. A flat laying ensures relatively balanced stress on all glass bricks, preventing excessive local stress that could lead to breakage. Since gaps are inevitable when arranging glass bricks, these gaps should not be too large, as this would allow heat to easily transfer. Therefore, within the same insulation layer, the gap width between two adjacent glass bricks is required to be less than or equal to 2 mm. When the gaps between the upper and lower layers are connected, heat may be transferred through the gaps, reducing the overall insulation effect. Therefore, it is necessary to block the connection between the gaps. Thus, the misalignment distance between the gaps in two adjacent insulation layers should be greater than or equal to 100 mm. This reduces heat transfer through the gaps, thereby improving the insulation effect at the bottom of the cold storage tank 100. Additionally, the gaps can be filled with sealant to prevent their formation.

[0034] Since glass bricks are difficult to cover the entire first insulation zone, there is a gap between the insulation layer and the outer tank 1. Glass wool 4 is filled between the insulation layer and the outer tank 1. On one hand, the insulation layer and the outer tank 1 have flexibility and elasticity, which can buffer the mechanical stress between the inner tank 2 and the outer tank 1. On the other hand, filling the gap between the insulation layer and the outer tank 1 provides insulation. Due to thermal expansion and contraction, the glass wool 4 can also compensate for deformation.

[0035] To ensure the insulation layer is horizontally positioned and evenly stressed, a plain concrete leveling layer 5 is installed between the bottom of the outer tank 1 and the insulation layer. To prevent bulging during construction, a cold primer is applied to the side of the plain concrete leveling layer 5 facing the inner tank 2. The cold primer seals the capillaries of the plain concrete leveling layer 5, preventing moisture penetration and reducing blistering. The cold primer coating rate is 3~4 m² / L.

[0036] To ensure sufficient structural strength to support the inner tank 2 within the first insulation zone, the cold storage tank 100 further includes a support ring 6 and an asphalt felt 7. The support ring 6 is located within the first insulation zone, with the glass bricks positioned around its periphery. The support ring 6 is made of concrete and, since it lacks insulation properties, the asphalt felt 7 is placed between the glass bricks and the support ring 6, finally covered with a moisture-proof membrane and a dry sand layer. The key functions of the asphalt felt 7 here include filling construction gaps, absorbing deformation, assisting in sealing, and forming a complete insulation system together with the foam glass. Laying the asphalt felt 7 on both the upper and lower surfaces of the insulation layer effectively isolates and protects the fragile glass bricks, preventing them from breaking during construction due to the weight of the steel tank or external pressure. This layered structure significantly improves the pressure-bearing capacity and uniformity of the insulation layer, ensuring the stability of the overall structure.

[0037] To improve the thermal insulation and moisture-proof capabilities of the asphalt felt 7, the asphalt felt 7 comprises multiple pieces, with adjacent pieces of the asphalt felt 7 at least partially overlapping, and the width of the overlapping portion being greater than or equal to 25 mm.

[0038] The cold insulation effect of the cold storage tank 100 is also related to the surrounding cold insulation structure. A second insulation zone is formed between the side wall of the outer tank 1 and the side wall of the inner tank 2. The cold storage tank 100 also includes an elastic felt 8, which is disposed in the second insulation zone and laid on the outer side wall of the inner tank 2. The elastic felt 8 is in close contact with the wall of the inner tank 2, and due to its elasticity, it can expand and contract together with the wall of the inner tank 2, effectively playing a role in cold insulation.

[0039] The elastic felt 8 is provided with multiple layers, and the cold storage container 100 also includes fixing nails 9. Please refer to [link / reference]. Figure 2 The fixing nail 9 has a rod and a head. The head is connected to one end of the rod, and multiple layers of elastic felt 8 are inserted through the rod. The other end of the rod is fixedly connected to the side wall of the inner tank 2. The multiple layers of elastic felt 8 are positioned between the head and the side wall of the inner tank 2, and the elastic felt 8 are compressed in the radial direction of the tank. By setting the fixing nail 9, the elastic felt 8 is compressed to 2 / 3 of its natural state, so that each layer of elastic felt 8 is tightly stacked, eliminating gaps between the elastic felt 8 and improving the heat insulation effect.

[0040] The cold insulation structure around the cold storage tank 100 includes not only the elastic felt 8, but also glass cloth 10, expanded perlite 11, and expanded perlite sand. The glass cloth 10 is disposed in the second insulation zone and laid on the inner wall of the outer tank 1, forming a filling interval between the glass cloth 10 and the elastic felt 8. Expanded perlite 11 fills this filling interval, serving as the primary cold insulation material within the filling interval between the inner and outer tanks 1. Its microporous structure reduces the influence of air convection, allowing heat transfer to primarily occur through solid-state heat conduction, thus significantly reducing heat loss. Furthermore, the thermal conductivity of expanded perlite 11 is typically between 0.028 and 0.048 W / (m·K), far lower than other common insulation materials, making it an ideal choice for ultra-low temperature environments. The application of expanded perlite 11 in the cold storage tank 100 is not limited to cold insulation but also provides structural support. Gaps exist between the larger expanded perlite blocks 11, which are filled with smaller expanded perlite sand. The elastic felt blocks 8 should be tightly joined together without gaps, and the seams between layers should be staggered by at least 100mm. The seams of the fiberglass cloth 10 and the elastic felt 8 should be staggered by at least 150mm, and the overlap width between fiberglass cloth blocks 10 should be no less than 150mm. The overlaps of the fiberglass cloth 10 should be firmly glued to prevent expanded perlite 11 from entering the inner layer of the elastic felt 8. The outer side of the fiberglass cloth 10 should be secured with rope. After installation, the elastic felt 8 should be visually inspected. The surface should be flat, without twisting, wrinkles, or tilted seams. There should be no bulging or ripples at the seams, and the overlaps of the fiberglass cloth 10 should be firmly and reliably bonded.

[0041] For the cold insulation structure at the top of the cold insulation tank 100, a third insulation zone is formed between the top of the outer tank 1 and the top of the inner tank 2 in the vertical direction; the cold insulation tank 100 also includes a glass fiber mat 12, which is laid on the outer wall of the inner tank 2 within the third insulation zone, and its thickness is greater than or equal to 900 mm. Each layer of glass fiber mat 12 is preferably laid in a staggered or parallel arrangement at 90 degrees to each other.

[0042] To prevent heat exchange through the gaps between the fiberglass felts 12, multiple fiberglass felts 12 on the side away from the inner tank 2 are arranged with at least partial overlap between adjacent fiberglass felts 12, and the overlap is sealed with aluminum foil tape, so that the upper surface of the multi-layer fiberglass felts 12 is completely sealed, thereby improving the cold insulation effect.

[0043] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A cryogenic tank for containing liquefied natural gas, characterized in that, include: The outer can has a first cavity; An inner tank is installed in the first cavity, and the inner tank has a second cavity for containing liquefied natural gas. A first heat-insulating zone is formed between the bottom of the outer tank and the bottom of the inner tank in the vertical direction. Multiple glass bricks are laid horizontally to form an insulation layer. The insulation layer has multiple layers in the vertical direction and fills the first insulation area. There are gaps between two adjacent glass bricks in the same insulation layer, and the gaps in two adjacent insulation layers are staggered. Within the same insulation layer, the gap width between two adjacent glass bricks is less than or equal to 2 mm, and the height difference between any two glass bricks in the vertical direction is less than or equal to 2 mm; the misalignment distance between gaps in two adjacent insulation layers is greater than or equal to 100 mm.

2. The cold bank of claim 1, wherein, The cold storage tank also includes glass wool, which is disposed between the outer periphery of the insulation layer and the inner wall of the outer tank within the first insulation zone.

3. The cold bank of claim 1, wherein, A plain concrete leveling layer is provided between the bottom of the outer tank and the insulation layer, and a cold primer is applied to the side of the plain concrete leveling layer facing the inner tank.

4. The cold bank of claim 3, wherein, The cold storage tank also includes a support ring and an asphalt felt. The support ring is disposed in the first insulation zone, the glass brick is located on the periphery of the support ring, and the asphalt felt is disposed between the plain concrete leveling layer and the insulation layer, between the support ring and the insulation layer, and between two adjacent insulation layers.

5. The cold bank of claim 4, wherein, The asphalt felt comprises multiple pieces, with adjacent pieces of the asphalt felt at least partially overlapping, and the width of the overlapping portion being greater than or equal to 25 millimeters.

6. The insulating container of claim 1, wherein, A second insulation zone is formed between the outer tank sidewall and the inner tank sidewall; the cold storage tank also includes an elastic felt, which is disposed in the second insulation zone and laid on the outer sidewall of the inner tank.

7. The cold bank of claim 6, wherein, The elastic felt is provided in multiple layers, and the cold storage tank also includes a fixing nail. The fixing nail has a rod and a head. The head is connected to one end of the rod. Multiple layers of the elastic felt are passed through the rod. The other end of the rod is fixedly connected to the side wall of the inner tank. The multiple layers of elastic felt are limited and installed between the head and the side wall of the inner tank. The elastic felt is compressed in the radial direction of the inner tank.

8. The insulating container of claim 6, wherein, The cold storage container also includes: A glass cloth is placed in the second insulation zone and laid on the inner side wall of the outer tank, forming a filling area between the glass cloth and the elastic felt; Expanded perlite is used to fill the filling area; Expanded perlite is used to fill the gaps in the expanded perlite.

9. The insulating container of claim 1, wherein, A third insulation zone is formed between the top of the outer tank and the top of the inner tank in the vertical direction; the cold storage tank also includes a glass fiber mat, which is laid on the outer side wall of the inner tank in the third insulation zone, and its thickness is greater than or equal to 900 mm.

10. The insulating container of claim 9, wherein, Among the multiple pieces of glass fiber mats on the side away from the inner tank, adjacent pieces of glass fiber mats are at least partially overlapped, and the overlap is sealed with aluminum foil tape.

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