Double-layer combined plate type insulation unit and system for low-temperature storage tank

Abstract

The utility model provides a double-layer combined plate type insulation unit and system for a low-temperature storage tank, and the insulation unit comprises a first insulation block which is connected with a tank body outer plate through a first bolt and comprises an inner loose insulation layer, a metal grid layer and a compact insulation layer which are sequentially arranged on the tank body outer plate; in the Y direction, the metal grid layer of the first insulation block is flush with the inner loose insulation layer, and the two ends of the metal grid layer of the first insulation block extend to the outside of the compact insulation layer in the Y direction to form first extension sections respectively; the insulating block II comprises an inner loose insulating layer, a metal grid layer and a compact insulating layer which are sequentially arranged on the outer plate of the tank body; in the Y direction, one end of the metal grid layer extends to the outside of the inner loose insulating layer and the outside of the compact insulating layer, one section of the metal grid layer extending to the outside of the inner loose insulating layer protrudes outwards and forms a second extension section, and the second extension section is in lap joint with one of the first extension sections. According to the utility model, the installation speed is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of insulation of cryogenic storage tanks, and in particular relates to a double-layer combined plate-type insulation unit and system for cryogenic storage tanks. Background Art

[0002] As low-carbon and environmental protection requirements become increasingly stringent, LNG (liquefied natural gas), liquid ammonia, and liquid hydrogen will be increasingly widely used as clean and green energy. They are usually stored in cryogenic cargo tanks. For cryogenic cargo tanks, they face the problem of insulation. It is necessary to prevent heat from entering the tanks and vaporizing the liquid cargo, and at the same time, to prevent the low temperature from being transmitted to the surrounding structures and causing damage. In order to break the monopoly of cryogenic cargo tank technology, new cryogenic tank technologies are also booming. Among them, IM0 B tank technology is the most rapidly developing and has been recognized by more and more shipowners and shipyards.

[0003] However, Type B cabin insulation has unique requirements, requiring a leakage path and ensuring tightness. Currently, the insulation systems for Type B cabins on the market are relatively limited, primarily consisting of pure plate-type insulation and hybrid insulation. However, pure plate-type insulation has low material utilization, requires the design of a specialized leakage path device, and requires leveling of each insulation block, making installation very time-consuming. Summary of the Invention

[0004] The purpose of this utility model is to provide a double-layer composite plate insulation unit, system and construction for cryogenic storage tanks, which can increase the installation speed and reduce the construction period. The technical solution adopted is as follows:

[0005] A double-layer composite plate-type insulation unit for a cryogenic storage tank, comprising:

[0006] The first insulating block 12 is connected to the outer plate 1 of the tank body by a first bolt, and comprises an inner loose insulating layer, a metal mesh layer and a dense insulating layer sequentially arranged on the outer plate 1 of the tank body;

[0007] Wherein, along the Y direction, the metal mesh layer of the first insulating block 12 is flush with the inner loose insulating layer, and both ends of the metal mesh layer of the first insulating block 12 extend along the Y direction to the outside of the dense insulating layer to form a first extension segment respectively;

[0008] and a second insulating block 11, comprising an inner loose insulating layer 2, a metal mesh layer 10 and a dense insulating layer 3 sequentially arranged on the outer plate 1 of the tank;

[0009] In the Y direction, one end of the metal mesh layer 10 extends to the outside of the inner loose insulating layer 2 and the outside of the dense insulating layer 3, and the section extending to the outside of the inner loose insulating layer 2 bulges outward to form a second extension section, which overlaps the outer surface of one of the first extension sections;

[0010] The second extension section and the corresponding first extension section are connected to the outer plate 1 of the tank through the same fastening unit;

[0011] A gap for installing the fastening unit is formed between the dense insulating layer 3 of the second insulating block 11 and the dense insulating layer of the first insulating block 12 .

[0012] Preferably, the fastening unit comprises:

[0013] The second bolt 9 is welded to the outer plate 1 of the tank and is located between the inner loose insulating layer 2 of the second insulating block 11 and the inner loose insulating layer of the first insulating block 12;

[0014] The washer nut 15 is installed on the No. 2 bolt 9 to control the thickness of the inner loose insulation layer after compression;

[0015] The gasket 7 is mounted on the second bolt 9 and contacts the second extension section;

[0016] And the No. 2 nut, which is threadedly matched with the No. 2 bolt 9 to fix the No. 2 insulating block 11 to the outer plate 1 of the tank.

[0017] Preferably, the fastening unit further comprises a U-shaped needle 13, which passes through the mounting hole provided on the gasket 7; a portion of the U-shaped needle 13 passes through the second extension section of the second insulating block 11, the first extension section of the first insulating block 12, and is inserted into the inner loose insulating layer of the first insulating block 12;

[0018] Another portion of the U-shaped needles 13 passes through the other portion of the metal mesh layer 10 of the second insulating block 11 and is inserted into the inner loose insulating layer 2 of the second insulating block 11 .

[0019] Preferably, the second extension section is connected to the first extension section via a circular buckle.

[0020] Preferably, the gaps between the dense insulation layers are filled with in-situ foamed polyurethane 5 .

[0021] Preferably, the inner loose insulation layer, the metal mesh layer and the dense insulation layer of the No. 1 insulation block 12 are bonded in sequence, and the No. 1 bolt is welded to the outer plate 1 of the tank and passes through the inner loose insulation layer and the metal mesh layer outward in sequence;

[0022] The dense insulating layer is provided with a bolt installation hole for installing the No. 1 bolt, and the bolt installation hole is filled with on-site foamed polyurethane.

[0023] Preferably, the inner loose insulating layer of the No. 1 insulating block 12 has the same structure as the inner loose insulating layer 2 of the No. 2 insulating block 11 , and both are made of fiber-type insulating material.

[0024] A double-layer combined plate-type insulation system for a cryogenic storage tank comprises a plurality of double-layer combined plate-type insulation units for a cryogenic storage tank.

[0025] Preferably, the No. 1 insulating block is connected to two No. 2 insulating blocks at the same time.

[0026] A construction method for a double-layer composite plate insulation system for a cryogenic storage tank, based on the double-layer composite plate insulation system for a cryogenic storage tank, comprises the following steps:

[0027] Step 1: Mark the outer surface of the tank outer plate 1 to mark several different circumferences where the No. 1 bolt and the No. 2 bolt 9 are located, and then weld the No. 1 bolt and the No. 2 bolt 9 using stud welding;

[0028] Then tighten the washer nut 15 on the second bolt 9 to the specified height;

[0029] Among them, the number of the circle where the No. 1 bolt is located is 1;

[0030] On the circumference where the second bolt 9 is located, there are several bolts distributed along the Y direction;

[0031] The Tuesday of the circle adjacent to the Monday of the circle is the Tuesday of the circle numbered 1, and the numbers of the Tuesdays of the circle in the positive direction and the negative direction along the Y direction increase in sequence;

[0032] Step 2: Install all No. 1 insulating blocks 12 to form a No. 1 combined insulating block:

[0033] Put the No. 1 insulating block 12 onto the No. 1 bolt on the circumference, and then tighten the No. 1 nut to fix the No. 1 insulating block 12 to the outer plate 1 of the tank;

[0034] At this time, along the Y direction, the No. 1 extension section of the metal mesh layer of the No. 1 insulating block 12 is in contact with the corresponding No. 2 bolt 9 on the circumference of the No. 1 circle respectively;

[0035] Step 3: Install a row of No. 2 insulation blocks 11 on both sides of the No. 1 combined insulation block simultaneously:

[0036] Slide the second extension section of the metal mesh layer 10 of each second insulating block 11 onto the second bolt 9 on the circumference of the first circle, then install the washer 7 on the second bolt 9, and finally tighten the second nut to simultaneously fix the second extension section of the second insulating block 11 and the first extension section of the first insulating block 12 to the outer plate 1 of the tank;

[0037] At this time, the No. 3 extension section of the No. 2 insulating block 11 of the second row abuts against the No. 2 bolt 9 on the corresponding No. 2 circle 2;

[0038] Step 4: Install two more rows of No. 2 insulation blocks 11 on both sides of the No. 1 combination insulation block:

[0039] Put the No. 2 extension section of the metal mesh layer 10 of the No. 2 insulating block 11 on the No. 2 bolt 9 on the circumference of the No. 2 circle, then install the gasket 7 on the No. 2 bolt 9, and finally screw on the No. 2 nut to fix the No. 2 extension section of the No. 2 insulating block 11 in step 4 and the No. 3 extension section of the No. 2 insulating block 11 in step 3 to the outer plate 1 of the tank at the same time.

[0040] Compared with the prior art, the advantages of the present invention are:

[0041] 1. The double-layer plate structure made of different materials is adopted. The loose insulation layer on the inner layer can simultaneously play the role of insulation, form a leakage channel, adjust the deformation of the tank body and absorb the deformation caused by thermal expansion and contraction. There is no need to add gasket structures of different thicknesses between the inner insulation and the tank body, which greatly reduces the complexity of low-temperature plate insulation, not only reduces costs and increases installation speed, but also improves the crack prevention performance of the insulation system.

[0042] 2. The inner loose insulation layer is highly compressible, so its size is larger than the actual floor area during prefabrication. During installation, just squeeze the edges slightly, which can effectively eliminate the problems of inaccurate bolt positioning and errors in the construction of the insulation box, effectively reducing the cost of precision control. It can also omit the caulking structure between the insulation, essentially ensuring the continuity of the insulation layer, further reducing the material procurement cost, and increasing the installation speed because there is no need for caulking.

[0043] 3. Ultra-thin spacer nuts are set on the bolt structure, which eliminates the need to precisely control the compression of the inner insulation. This allows for quick installation while ensuring uniform thickness of the inner insulation.

[0044] 4. The No. 1 insulating block 12 and the No. 2 insulating block 11 are both prefabricated parts, which are connected together by low-temperature glue to form a combined insulating block to reduce on-site installation time and thus increase installation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a partial cross-sectional view of a double-layer composite plate insulation unit for a cryogenic storage tank after expansion;

[0046] Figure 2 This is a schematic diagram of the expanded double-layer composite plate insulation system for cryogenic storage tanks;

[0047] Figure 3 for Figure 2 A partial view of

[0048] Figure 4 is a diagram showing the connection relationship between the No. 1 insulating block and the No. 2 insulating block;

[0049] Figure 5 A top view of the gasket.

[0050] 1-tank outer plate, 2-inner loose insulation layer, 3-dense insulation layer, 4-outer embossed aluminum foil layer, 5-in-situ foamed polyurethane, 6-butyl tape, 7-gasket, 8-nut, 9-bolt, 10-metal mesh layer;

[0051] 11- No. 2 insulation block, 12- No. 1 insulation block, 13- U-shaped needle, 14- round, 15- washer nut; DETAILED DESCRIPTION

[0052] The following schematic diagrams provide a more detailed description of the double-layer composite plate insulation system for cryogenic storage tanks and its construction, illustrating preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as a general guideline for those skilled in the art and not as a limitation of the present invention.

[0053] Example 1

[0054] like Figures 1 to 5 , a double-layer composite plate insulation unit for a low-temperature storage tank, at this time the outer plate 1 of the tank is in the expanded state.

[0055] In this embodiment, the “Y direction” refers to the height direction of the low-temperature storage tank, that is, the height direction of the outer plate 1 of the tank.

[0056] “X direction” refers to the radial direction of the cryogenic storage tank.

[0057] In other embodiments, the definitions of “Y direction” and “X direction” can be interchanged.

[0058] A double-layer composite plate insulation system for a cryogenic storage tank, specifically comprising:

[0059] Several double-wall composite plate insulation units for cryogenic storage tanks.

[0060] After the dense insulation layers of adjacent No. 1 insulation blocks 12 are filled with polyurethane on site, butyl tape is set;

[0061] After the dense insulating layers 3 of adjacent No. 2 insulating blocks 11 are filled with polyurethane on site, butyl tape is placed.

[0062] Specifically, the No. 1 insulating block 12 is connected to the outer plate 1 of the tank body through a No. 1 bolt, and includes an inner loose insulating layer, a metal mesh layer and a dense insulating layer sequentially arranged on the outer plate 1 of the tank body.

[0063] Among them, along the Y direction, the metal grid layer of the No. 1 insulating block 12 is flush with the inner loose insulating layer, and both ends of the metal grid layer of the No. 1 insulating block 12 extend along the Y direction to the outside of the dense insulating layer to form a No. 1 extension segment respectively.

[0064] The second insulating block 11 includes an inner loose insulating layer 2, a metal mesh layer 10 and a dense insulating layer 3 which are sequentially arranged on the outer plate 1 of the tank body.

[0065] Among them, along the Y direction, one end of the metal mesh layer 10 extends to the outside of the inner loose insulation layer 2 and the outside of the dense insulation layer 3, and the section extending to the outside of the inner loose insulation layer 2 protrudes outward and forms a No. 2 extension segment, which is overlapped with the outer surface of one of the No. 1 extension segments, or with the No. 3 extension segment of other No. 2 insulation blocks.

[0066] The second extension segment overlaps the outer surface of one of the first extension segments, that is, the second extension segment overlaps the first extension segment to form an overlapping area, and the overlapping width of the overlapping area along the Y direction (along the Y direction) must exceed 20 mm.

[0067] The second extension section and the corresponding first extension section are connected to the outer plate 1 of the tank through the same fastening unit;

[0068] A gap for installing the fastening unit is formed between the dense insulating layer 3 of the second insulating block 11 and the dense insulating layer of the first insulating block 12 .

[0069] The gaps between the mounting fastening units are filled with on-site foamed polyurethane 5.

[0070] That is, after the installation on the surface of the tank is completed, a gap is left between the dense insulating layer 3 of the No. 2 insulating block 11 and the dense insulating layer of the No. 1 insulating block 12. Finally, the gap is filled with on-site foamed polyurethane, so that the dense insulating layer 3 of the No. 2 insulating block 11 and the dense insulating layer of the No. 1 insulating block 12 form a dense whole, effectively forming a shield.

[0071] At the same time, the outer side of the foamed insulation layer is sealed with butyl tape 6 to provide waterproof and mechanical protection.

[0072] When the outer plate 1 of the tank is in the expanded state, the butyl tape 6 extends along the X direction; when the outer plate 1 of the tank is in the unexpanded state, the butyl tape 6 extends along the circumferential direction.

[0073] Furthermore, along the Y direction, the other end of the metal grid layer 10 of the second insulating block 11 is flush with the inner loose insulating layer 2 and extends along the Y direction to the outside of the dense insulating layer 3 to form a third extension segment.

[0074] The third extension segment formed by the second insulating block 11 overlaps with the second extension segment formed by another second insulating block 11 to form an overlapping area.

[0075] The third extension section and the second extension section are both connected to the outer plate 1 of the tank through the same fastening unit.

[0076] This cycle is repeated to increase the size of the insulation system along the Y direction. The above connection method is the same as Figure 4 same.

[0077] like Figure 4 As shown, the fastening unit includes:

[0078] The second bolt 9 is welded to the outer plate 1 of the tank, and is located between the inner loose insulating layer 2 of the second insulating block 11 and the inner loose insulating layer of the first insulating block 12 and is in contact with both;

[0079] The washer nut 15 is mounted on the second bolt 9 and is used to control the thickness of the inner loose insulation layer after compression. The washer nut 15 is an ultra-thin thrust nut.

[0080] The washer 7 is sleeved on the second bolt 9 and contacts the second extension. In order to increase the contact area, the washer 7 is added between the metal mesh layer and the nut for effective fixation.

[0081] The No. 2 nut is threadably matched with the No. 2 bolt 9 to fix the No. 2 insulating block 11 to the outer plate 1 of the tank.

[0082] For further fixing, there are many holes around the gasket 7 for installing U-shaped needles 13.

[0083] The U-shaped needle 13 passes through the mounting hole formed in the gasket 7 .

[0084] A portion of the U-shaped needle 13 passes through the second extension section of the second insulating block 11 , the first extension section of the first insulating block 12 , and is inserted into the inner loose insulating layer of the first insulating block 12 .

[0085] Another portion of the U-shaped needles 13 passes through the other portion of the metal mesh layer 10 of the second insulating block 11 and is inserted into the inner loose insulating layer 2 of the second insulating block 11 .

[0086] The “other parts of the metal mesh layer 10 ” refer to the parts of the metal mesh layer 10 excluding the second extension segment.

[0087] The U-shaped needle has a pointed structure with a radius slightly larger than the aperture of the metal mesh, so that the metal mesh layer can be effectively inserted and fixed.

[0088] Figure 1 In the figure, the U-shaped needle 13 is not shown.

[0089] Further, if Figure 3 As shown, the second extension section is connected to the first extension section (in the overlapping area) by a circular buckle. Specifically, a C-shaped nail is driven into the two metal mesh layers in the overlapping area using a C-shaped nail gun, forming a circular buckle that connects the two metal mesh layers together, thus forming a single unit. This effectively forms an enveloping layer between the tensile layer and the inner insulating layer, providing effective fixation and strength.

[0090] In addition, the No. 2 extension section is connected to the No. 3 extension section of another No. 2 insulating block 11 through a circular buckle.

[0091] like Figures 2 and 3 As shown, the inner loose insulation layer, the metal mesh layer and the dense insulation layer of the No. 1 insulation block 12 are bonded in sequence, and the No. 1 bolt is welded to the outer plate 1 of the tank and passes through the inner loose insulation layer and the metal mesh layer outward in sequence;

[0092] Bolt installation holes for installing No. 1 bolts are provided on the dense insulation layer, and the bolt installation holes are filled with on-site foamed polyurethane.

[0093] The inner loose insulation layer, metal mesh layer and dense insulation layer of the No. 1 insulation block 12 are all prefabricated parts and are connected together by low-temperature glue to form a combined insulation block to reduce on-site installation time.

[0094] The inner loose insulation layer 2, the metal mesh layer 10 and the dense insulation layer 3 of the second insulation block 11 are all prefabricated parts and are connected together by low-temperature glue to form a combined insulation block to reduce on-site installation time.

[0095] The inner loose insulating layer of the No. 1 insulating block 12 has the same structure as the inner loose insulating layer 2 of the No. 2 insulating block 11 , and both are made of fiber-type insulating material.

[0096] Fibrous insulation materials, such as glass wool, rock wool, aerogel, phenolic resin, etc., are prefabricated with a loose inner insulation layer, compacted and cut into the required size and thickness.

[0097] About the inner loose insulation layer 2:

[0098] The structure of this layer of insulation must be loose and compressible by more than 20%, allowing gas and liquid to pass freely, forming a natural liquid and gas channel for tank leakage. At the same time, due to the loose structure, the insulation can be freely deformed as the tank cools down without forming additional temperature stress, thereby preventing the insulation from cracking as a whole.

[0099] At the same time, the inner loose insulating layer 2 is deformable so that it can adhere to the outer surface of the outer plate 1 of the tank along the circumference when installed on the tank body.

[0100] The dense insulating layer of the first insulating block 12 has the same structure as the dense insulating layer 3 of the second insulating block 11 .

[0101] About dense insulation layer 3:

[0102] This layer of insulation cooperates with the inner loose insulation 2. The structure of this layer of insulation must have a certain tensile and compressive strength, at least greater than 0.18MPa, and a certain water tightness, and a closed-pore rate of more than 92%, such as polyurethane and polystyrene boards, so as to achieve a good insulation effect and effectively shield the diffusion of low-temperature liquid and gas leaked from the tank, forming an effective shield with the outer layer.

[0103] In addition, an outer embossed aluminum foil layer 4 is adhered to the dense insulating layer 3 .

[0104] Further, if Figure 2 As shown, the No. 1 combined insulating block includes a plurality of No. 1 insulating blocks 12 , and the dense insulating layers of adjacent No. 1 insulating blocks 12 are connected by a butyl tape extending along the Y direction.

[0105] The No. 2 combined insulating block includes a plurality of No. 2 insulating blocks 11 , and the dense insulating layers 3 of adjacent No. 2 insulating blocks 11 are connected by a butyl tape extending along the Y direction.

[0106] The first insulating block 12 is connected to two second insulating blocks 11 at the same time. Specifically, all bolts 9 are arranged horizontally (in the X direction) at a distance of about 1 / 3 of the width of the lower insulating block, ensuring that each insulating block is fixed by more than 4 bolts.

[0107] Along the X-direction, only the horizontal height needs to be positioned. Because it is fixed by the metal grid layer, the spacing along the Y-direction does not need to be accurately positioned, which can effectively improve the positioning speed.

[0108] The width of the insulating block refers to the dimension between the two outer sides of the insulating block along the X direction when the outer plate 1 of the tank is in the unfolded state.

[0109] Specifically, such as Figure 2 As shown, there are four bolts 9 on a No. 1 insulating block 12.

[0110] There are four bolts 9 on a No. 2 insulating block 11:

[0111] The second extension section of the metal mesh layer 10 of the second insulating block 11 is connected to the first extension section of the first insulating block 12 (two) using two bolts 9.

[0112] The third extension section of the metal mesh layer of the second insulating block 11 is overlapped and connected with the second extension sections of another second insulating block 11 (two), using two bolts 9.

[0113] In summary, regarding the second insulating block 11 and the first insulating block 12:

[0114] Insulation block No. 12 is the first row of insulation of the tank body, so the size of the metal mesh layer is consistent with the size of the loose insulation of the inner layer, and there is no protrusion on all sides. In order to fix it, a hole is opened in the center of the dense insulation board of the outer layer of this type, and it is fixed and positioned at this position with bolts and nuts.

[0115] The second insulating block 11 has no holes in the outer dense insulating layer 3 and is fixed at both sides.

[0116] When the second insulating block 11 is installed, the extended metal mesh layer (second extension section) is first fixed to the screw 9, and then the next layer of second insulating block 11 is installed to complete the installation.

[0117] In this embodiment, the "Y direction" refers to the height direction of the cryogenic storage tank, that is, the height direction of the tank outer plate 1, and the "X direction" refers to the radial direction of the cryogenic storage tank. The construction method of the double-layer composite plate insulation system for the cryogenic storage tank includes the following steps:

[0118] Step 1: Mark the outer surface of the tank outer plate 1 to mark several different circumferences where the No. 1 bolt and the No. 2 bolt 9 are located, and then use stud welding to weld the No. 1 bolt and the No. 2 bolt 9 to weld both the No. 1 bolt and the No. 2 bolt 9 to the tank outer plate 1.

[0119] Then tighten the washer nut 15 onto the No. 2 bolt 9 to the specified height.

[0120] Specifically, the circle where bolt No. 1 is located is numbered 1 and is marked with a line.

[0121] There are several bolts 9 on the circle where they are located and they are distributed along the Y direction and are all marked with lines.

[0122] The Tuesday of the circle adjacent to the Monday of the circle is the Tuesday of the circle numbered 1, and the numbers of the Tuesdays of the circle in the positive direction along the Y direction and the negative direction along the Y direction increase successively.

[0123] That is, the circumference of the circle is symmetrically distributed about the first insulating block 12 .

[0124] Figure 2 Only 2 circles were shown on Tuesday.

[0125] That is, there is only one row of No. 1 insulating blocks on each side of the tank body, and the others are composed of No. 2 insulating blocks, and the connection between them is similar to the connection with No. 1 insulating blocks.

[0126] Step 2: Install all No. 1 insulating blocks 12 to form a No. 1 combined insulating block.

[0127] Put the No. 1 insulating block 12 onto the No. 1 bolt on the circumference, and then tighten the No. 1 nut to fix the No. 1 insulating block 12 to the outer plate 1 of the tank;

[0128] At this time, the No. 1 combined insulating block wraps around the outer plate 1 of the low-temperature storage tank along the circumferential direction; that is, the outer plate 1 of the tank is in an unfolded state at this time.

[0129] Figure 2 Only a portion of the No. 1 insulating block 12 in the No. 1 combined insulating block and a portion of the No. 2 insulating block 11 in the No. 2 combined insulating block are shown.

[0130] At this time, along the Y direction, the No. 1 extension section of the metal mesh layer of the No. 1 insulating block 12 contacts the No. 2 bolts 9 on the circumference of the No. 1 circle respectively.

[0131] Step 3: Install a row of No. 2 insulating blocks 11 simultaneously on both sides of the No. 1 combined insulating block.

[0132] On one side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of a row (several) of No. 2 insulating blocks 11 is put on the No. 2 bolts 9 on the circumference of a No. 1 circle, and then the gasket 7 is installed on the No. 2 bolts 9, and finally the No. 2 nut is screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 and a No. 1 extension section of the No. 1 insulating block 12 to the outer plate 1 of the tank at the same time.

[0133] At the same time, on the other side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of a row (several) of No. 2 insulating blocks 11 is put on the No. 2 bolts 9 on the circumference of another No. 1 circle, and then the gasket 7 is installed on the No. 2 bolts 9, and finally the No. 2 nut is screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 and the other No. 1 extension section of the No. 1 insulating block 12 to the outer plate 1 of the tank at the same time.

[0134] At this time, the No. 3 extension sections of the No. 2 insulating blocks 11 of the second row abut against the No. 2 bolts 9 on the circumference of the corresponding No. 2 circle.

[0135] Among them, the “row of second insulation blocks 11 ” wraps around the outer plate 1 of the tank.

[0136] Step 4: Continue to install another two rows of No. 2 insulation blocks 11 on both sides of the No. 1 combined insulation block.

[0137] On one side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of a row (several) No. 2 insulating blocks 11 is put on the No. 2 bolt 9 on the circumference of a No. 2 circle, then the gasket 7 is installed on the No. 2 bolt 9, and finally the No. 2 nut is screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 in step 4 and the No. 3 extension section of a No. 2 insulating block 11 in step 3 to the outer plate 1 of the tank at the same time.

[0138] At the same time, on the other side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of a row (several) No. 2 insulating blocks 11 is put on the No. 2 bolts 9 on the circumference of another No. 2 circle, and then the gasket 7 is installed on the No. 2 bolts 9, and finally the No. 2 nuts are screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 in step 4 and the No. 3 extension section of another No. 2 insulating block 11 in step 3 to the outer plate 1 of the tank at the same time.

[0139] At this time, the No. 3 extension section of the No. 2 insulating block 11 of the second row abuts against the No. 2 bolt 9 on the corresponding No. 3 circle.

[0140] Among them, the “row of second insulation blocks 11 ” wraps around the outer plate 1 of the tank.

[0141] Step 5: Repeat step 4 until the last row of No. 2 insulation blocks 11 is installed.

[0142] At this time, the No. 3 extension sections of the No. 2 insulating blocks 11 of the two rows abut against the No. 2 bolts 9 on the corresponding No. N circumference.

[0143] Step 6. Install the washer 7 on the No. 2 bolt 9 and finally tighten the No. 2 nut.

[0144] Example 2

[0145] In this embodiment, the "X direction" refers to the height direction of the cryogenic storage tank, that is, the height direction of the tank outer plate 1, and the "Y direction" refers to the radial direction of the cryogenic storage tank. The construction method of the double-layer composite plate insulation system for the cryogenic storage tank includes the following steps:

[0146] Step 1: Mark the outer surface of the tank outer plate 1 to mark several different columns where the No. 1 bolt and the No. 2 bolt 9 are located, and then use stud welding to weld the No. 1 bolt and the No. 2 bolt 9 to weld both the No. 1 bolt and the No. 2 bolt 9 to the tank outer plate 1.

[0147] Then tighten the washer nut 15 onto the No. 2 bolt 9 to the specified height.

[0148] Specifically, column one where bolt number one is located has a quantity of 1 and is marked with a line.

[0149] The second row where the No. 2 bolts 9 are located has a number of bolts arranged along the circumference and are all marked with lines.

[0150] The second row adjacent to the first row is numbered row two. The numbers of the second rows increase in sequence both clockwise and counterclockwise along the circumference.

[0151] That is, the second row is symmetrically distributed about the first insulating block 12 .

[0152] Figure 2 Only 2 columns are shown.

[0153] Step 2: Install all No. 1 insulating blocks 12 to form a No. 1 combined insulating block.

[0154] Put the No. 1 insulating block 12 onto the No. 1 bolt on the first row, and then tighten the No. 1 nut to fix the No. 1 insulating block 12 to the outer plate 1 of the tank;

[0155] At this time, along the Y direction, the No. 1 extension section of the metal mesh layer of the No. 1 insulating block 12 is in contact with the No. 2 bolt 9 on the No. 1 column 2 respectively.

[0156] Step 3: Synchronously install a row of No. 2 insulating blocks 11 on both sides of the No. 1 combined insulating block.

[0157] On one side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of a row (several) No. 2 insulating blocks 11 is put on the No. 2 bolt 9 on a No. 1 row 2, then the gasket 7 is installed on the No. 2 bolt 9, and finally the No. 2 nut is screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 and a No. 1 extension section of the No. 1 insulating block 12 to the outer plate 1 of the tank at the same time.

[0158] At the same time, on the other side of the No. 1 combined insulating block, the No. 2 extension section of the metal grid layer 10 of another row (several) No. 2 insulating blocks 11 is put on the No. 2 bolt 9 on another No. 1 row, and then the gasket 7 is installed on the No. 2 bolt 9, and finally the No. 2 nut is screwed on to fix the No. 2 extension section of the No. 2 insulating block 11 and the other No. 1 extension section of the No. 1 insulating block 12 to the outer plate 1 of the tank at the same time.

[0159] At this time, the third extension section of the second insulating block 11 abuts against the second bolt 9 on the corresponding second row 2;

[0160] Step 4: Continue to install another two rows of No. 2 insulation blocks 11 on both sides of the No. 1 combined insulation block simultaneously.

[0161] On one side of the No. 1 combined insulating block, put a row (several) of the No. 2 extension sections of the metal mesh layer 10 of the No. 2 insulating block 11 on the No. 2 bolt 9 on the No. 2 row, then install the gasket 7 on the No. 2 bolt 9, and finally screw on the No. 2 nut to fix the No. 2 extension section of another No. 2 insulating block 11 and the No. 3 extension section of the No. 2 insulating block 11 in step 3 to the outer plate 1 of the tank at the same time.

[0162] At the same time, on the other side of the No. 1 combined insulating block, a row (several) of No. 2 extension sections of the metal grid layer 10 of another No. 2 insulating block 11 are put on the No. 2 bolts 9 on another No. 2 row 2, and the fastening method is the same as above.

[0163] At this time, the No. 3 extension section of the No. 2 insulating block 11 abuts against the No. 2 bolt 9 on the corresponding No. 3 row 2;

[0164] Step 5: Repeat step 4 until all No. 2 insulation blocks 11 are installed.

[0165] At this time, the No. 3 extension section of the No. 2 insulating block 11 in the 2nd row abuts against the No. 2 bolt 9 on the corresponding No. N row 2.

[0166] Step 6. Install the washer 7 on the No. 2 bolt 9 and finally tighten the No. 2 nut.

[0167] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other variation to the technical solution and technical content disclosed herein shall be deemed to fall within the scope of the present invention and remain within the scope of protection of the present invention.

Claims

1. A double-layer composite plate-type insulation unit for a cryogenic storage tank, characterized in that: include: A No. 1 insulating block (12) is connected to the outer plate (1) of the tank body via a No. 1 bolt, and comprises an inner loose insulating layer, a metal mesh layer, and a dense insulating layer sequentially arranged on the outer plate (1) of the tank body; Wherein, along the Y direction, the metal grid layer of the first insulating block (12) is flush with the inner loose insulating layer, and both ends of the metal grid layer of the first insulating block (12) extend along the Y direction to the outside of the dense insulating layer to form a first extension segment respectively; and a second insulating block (11), comprising an inner loose insulating layer (2), a metal mesh layer (10) and a dense insulating layer (3) sequentially arranged on the outer plate (1) of the tank; Wherein, along the Y direction, one end of the metal mesh layer (10) extends to the outside of the inner loose insulating layer (2) and the outside of the dense insulating layer (3), and the section extending to the outside of the inner loose insulating layer (2) bulges outward to form a second extension section, and the second extension section overlaps the outer surface of one of the first extension sections; The second extension section and the corresponding first extension section are both connected to the outer plate (1) of the tank via the same fastening unit; A gap for installing the fastening unit is formed between the dense insulating layer (3) of the second insulating block (11) and the dense insulating layer of the first insulating block (12).

2. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 1, characterized in that: The fastening unit comprises: A second bolt (9) is welded to the outer plate (1) of the tank and is located between the inner loose insulating layer (2) of the second insulating block (11) and the inner loose insulating layer of the first insulating block (12); A washer nut (15) is mounted on the second bolt (9) to control the thickness of the inner loose insulation layer after compression; A gasket (7) is sleeved on the second bolt (9) and contacts the second extension section; and a No. 2 nut, which is threadably coupled with the No. 2 bolt (9) to fix the No. 2 insulating block (11) to the outer plate (1) of the tank.

3. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 2, characterized in that: The fastening unit further comprises a U-shaped needle (13) which passes through a mounting hole provided on the gasket (7); a portion of the U-shaped needle (13) passes through the second extension section of the second insulating block (11), the first extension section of the first insulating block (12), and is inserted into the inner loose insulating layer of the first insulating block (12); Another part of the U-shaped needles (13) passes through the other parts of the metal mesh layer (10) of the second insulating block (11) and is inserted into the inner loose insulating layer (2) of the second insulating block (11).

4. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 1, characterized in that: The second extension section is connected to the first extension section via a circular buckle.

5. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 1, characterized in that: The gaps between the dense insulation layers are filled with on-site foamed polyurethane (5).

6. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 1, characterized in that: The inner loose insulation layer, the metal mesh layer and the dense insulation layer of the No. 1 insulation block (12) are sequentially bonded, and the No. 1 bolt is welded to the outer plate (1) of the tank and passes through the inner loose insulation layer and the metal mesh layer outward in sequence; The dense insulating layer is provided with a bolt installation hole for installing the No. 1 bolt, and the bolt installation hole is filled with on-site foamed polyurethane.

7. The double-layer composite plate-type insulation unit for a cryogenic storage tank according to claim 1, characterized in that: The inner loose insulating layer of the No. 1 insulating block (12) has the same structure as the inner loose insulating layer (2) of the No. 2 insulating block (11), and both are made of fiber-type insulating material.

8. A double-layer composite plate insulation system for cryogenic storage tanks, characterized in that: The invention comprises a plurality of double-layer composite plate-type insulation units for cryogenic storage tanks as described in any one of claims 1 to 7.

9. The double-layer composite plate insulation system for cryogenic storage tanks according to claim 8, characterized in that: The No. 1 insulating block is connected to two No. 2 insulating blocks at the same time.

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