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

Abstract

The invention provides a double-layer combined plate type insulation unit and system for a low-temperature storage tank and a construction method thereof.The insulation system comprises a first insulation block, a metal grid layer of the first insulation block is flush with an inner loose insulation layer in the Y direction, the two ends of the metal grid layer of the first insulation block extend to the exterior of a compact insulation layer in the Y direction, and the two ends of the metal grid layer of the first insulation block extend to the exterior of the compact insulation layer in the Y direction; a first extension section is formed respectively; one end of the second insulating block extends to the outer part of the inner loose insulating layer and the outer part of the compact insulating layer along the Y direction, and one section, extending to the outer part of the inner loose insulating layer, of the second insulating block protrudes outwards and forms a second extension section; only one row of the first insulation blocks are arranged on each face of the tank body, the other insulation blocks are composed of the second insulation blocks, the connection mode of the insulation blocks is similar to the connection mode of the insulation blocks and the first insulation blocks, a natural leakage channel can be formed, deformation of the tank body can be absorbed, tedious systems and leveling processes are not needed, cost is reduced, and production efficiency is improved. And the installation speed is also improved.

Description

Technical Field

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

[0002] As the requirements for low-carbon and environmental protection become more and more stringent, LNG (liquefied natural gas), liquid ammonia and liquid hydrogen will be more and more widely used as clean energy and green energy. They are usually stored in cryogenic liquid cargo tanks. For cryogenic liquid cargo tanks, they will face the problem of insulation, which is to prevent heat from entering the liquid cargo tanks and gasifying the liquid cargo, and at the same time, to prevent the low temperature from being transferred to the surrounding structures and causing damage to the surrounding structures. The technology of new cryogenic liquid cargo tanks is also booming, among which the IM0 B type tank technology is the leader, which has developed rapidly and has been recognized by more and more ship owners and shipyards.

[0003] However, the insulation requirements for Type B cabins are special, and a leakage channel must be left, and at the same time, there are certain tightness requirements for the leakage channel. At present, the insulation system of Type B cabins on the market is relatively simple, and there are mainly pure plate insulation and mixed insulation. However, the material utilization rate of pure plate insulation is low, and a special leakage channel device needs to be designed. Each piece of insulation needs to be leveled, and the installation is very time-consuming. Summary of the invention

[0004] The purpose of the present invention is to provide a double-layer composite plate insulation unit, system and construction thereof 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 combined 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 which are 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 section 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 which are sequentially arranged on the outer plate 1 of the tank;

[0009] Among them, 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 a 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;

[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 and is used to control the thickness of the inner loose insulation layer after compression;

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

[0016] And a 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 No. 2 extension section of the No. 2 insulating block 11, the No. 1 extension section of the No. 1 insulating block 12 and is inserted into the inner loose insulating layer of the No. 1 insulating block 12;

[0018] 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 .

[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 insulating layer, the metal mesh layer and the dense insulating layer of the No. 1 insulating block 12 are bonded in sequence, and the No. 1 bolt is welded to the outer plate 1 of the tank body and passes through the inner loose insulating 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 of a double-layer combined plate-type insulation system for a cryogenic storage tank, based on the double-layer combined plate-type 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 No. 2 bolt 9 to the specified height;

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

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

[0031] The Tuesday of the circle adjacent to the Monday of the circle is the Tuesday of the circle No. 1, and the numbers of the Tuesdays of the circles along the positive direction of the Y direction and the negative direction of the Y direction are increased 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] The second extension section of the metal mesh layer 10 of each second insulating block 11 is put on the second bolt 9 on the circumference of the first circle, then the gasket 7 is installed on the second bolt 9, and finally the second nut is screwed on to 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 at the same time;

[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 circumference of the corresponding No. 2 circle;

[0038] Step 4: Continue to install two 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 onto the No. 2 bolt 9 on the circumference of a 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 body at the same time.

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

[0041] 1. The double-layer board structure made of different materials is adopted. The loose insulation layer on the inner layer can simultaneously play the role of heat 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 board insulation, not only reduces costs and increases installation speed, but also improves the crack-stopping 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, and omitting the caulking structure between the insulation. In essence, the continuity of the insulation layer can be guaranteed, further reducing the material procurement cost, and increasing the installation speed because there is no need to caulk the seams.

[0043] 3. Ultra-thin gasket nuts are set on the bolt structure, which eliminates the need to precisely control the compression of the inner insulation. It can be installed quickly and ensure the uniformity of the inner insulation thickness.

[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 the installation time on site and thus increase the installation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a partial cross-sectional view after the double-layer composite plate insulation unit for cryogenic storage tanks is expanded;

[0046] Figure 2 It is a schematic diagram of the double-layer composite plate insulation system used for cryogenic storage tanks after expansion;

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

[0048] Figure 4 is a connection relationship diagram between the No. 1 insulation block and the No. 2 insulation 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-on-site 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 double-layer composite plate insulation system for cryogenic storage tanks and its construction of the present invention will be described in more detail below in conjunction with schematic diagrams, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0053] Embodiment 1

[0054] like Figures 1 to 5 , a double-layer combined plate-type insulation unit for a cryogenic storage tank, wherein the outer plate 1 of the tank is in an 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” may be interchangeable.

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

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

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

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

[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 which are 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 section respectively.

[0064] The second insulating block 11 comprises 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 insulating layer 2 and the outside of the dense insulating layer 3, and a section extending to the outside of the inner loose insulating layer 2 protrudes outward and forms a No. 2 extension segment, which overlaps the outer surface of one of the No. 1 extension segments, or the No. 3 extension segment of other No. 2 insulating 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 in which the fastening units are installed are filled with on-site foamed polyurethane 5.

[0070] That is, after the installation on the tank surface 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, and 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 body is in an unfolded state, the butyl tape 6 extends along the X direction, and when the outer plate 1 of the tank body is in an unfolded 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 No. 2 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 No. 3 extension section.

[0074] The third extension section formed by the second insulating block 11 overlaps with the second extension section 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 body 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 comprises:

[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 spacer nut 15 is installed on the second bolt 9 and is used to control the thickness of the inner loose insulating layer after compression. The spacer nut 15 is an ultra-thin thrust nut.

[0080] The gasket 7 is sleeved on the second bolt 9 and contacts the second extension section. In order to increase the contact area, the gasket 7 is added between the metal mesh layer and the nut to effectively fix them.

[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, the gasket 7 has many holes around its periphery for mounting the U-shaped needles 13 .

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

[0084] A portion of the U-shaped needle 13 passes through the No. 2 extension section of the No. 2 insulation block 11 , the No. 1 extension section of the No. 1 insulation block 12 , and is inserted into the inner loose insulation layer of the No. 1 insulation block 12 .

[0085] 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 .

[0086] The “other parts of the metal mesh layer 10 ” refers to the parts of the metal mesh layer 10 except 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 (overlapping area) by a circular buckle. Specifically, a C-type nail is driven into the two metal mesh layers by a C-type nail gun in the overlapping area to form a circular buckle, connecting the two metal mesh layers together, so that the metal mesh forms a whole, effectively forming a tensile layer and an inner insulating surrounding layer, forming 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 2-3 As shown, the inner loose insulating layer, the metal mesh layer and the dense insulating layer of the No. 1 insulating 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 insulating layer and the metal mesh layer outward in sequence;

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

[0093] The inner loose insulation layer, the metal mesh layer and the 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 the installation time on site.

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

[0095] The inner loose insulating layer of the first insulating block 12 has the same structure as the inner loose insulating layer 2 of the second 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 made by prefabricating the inner loose insulation layer, compacting and cutting it 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 deform freely as the tank cools down without forming additional temperature stress, thereby preventing insulation cracking as a whole.

[0099] At the same time, the inner loose insulating layer 2 is deformable so that it can fit 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 porosity 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 pasted on 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 No. 1 insulating block 12 is simultaneously connected to two No. 2 insulating blocks 11. Specifically, the distance between all the bolts 9 arranged in the horizontal direction (X direction) is 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, 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) by 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 section of another second insulating block 11 (two) by 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 inner loose insulation, and there is no protrusion on all sides. In order to fix it, a hole is opened in the center of the outer dense insulation board 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 the 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 combined plate insulation system for the cryogenic storage tank includes the following steps:

[0118] Step 1: draw lines on 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 on 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] On the circumference where the No. 2 bolt 9 is located, there are several bolts distributed along the Y direction, all of which are 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 No. 1 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, at this time, the outer plate 1 of the tank is in an unfolded state.

[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 is in contact with 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 mesh layer 10 of a row (several) No. 2 insulating blocks 11 is put on the No. 2 bolts 9 on the circumference of a No. 1 circle, 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 body 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 mesh 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, “a row of No. 2 insulating blocks 11 ” wrap around the outer plate 1 of the tank body.

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

[0137] On one side of the No. 1 combined insulating block, the No. 2 extension section of the metal mesh layer 10 of a row (several) No. 2 insulating blocks 11 is put on the No. 2 bolts 9 on the circumference of a No. 2 circle, 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 a No. 2 insulating block 11 in step 3 to the outer plate 1 of the tank body 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 mesh 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 body 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 circumference of the corresponding No. 3 circle;

[0140] Among them, “a row of No. 2 insulating blocks 11 ” wrap around the outer plate 1 of the tank body.

[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 second row abut against the No. 2 bolts 9 on the circumference of the corresponding No. N circle.

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

[0144] Embodiment 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 combined plate insulation system for the cryogenic storage tank includes the following steps:

[0146] Step 1: draw lines on 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 on the No. 2 bolt 9 to the specified height.

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

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

[0150] The second row adjacent to the first row is numbered second row, and the numbers of the second rows increase successively along the circumference clockwise and counterclockwise.

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

[0152] Figure 2 Only 2 columns are shown in Figure 2.

[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 No. 2 respectively.

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

[0157] On one side of the No. 1 combined insulating block, the No. 2 extension section of the metal mesh layer 10 of a row (several) No. 2 insulating blocks 11 is put on a No. 2 bolt 9 on a No. 1 row, 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 body 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 mesh 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 body at the same time.

[0159] 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. 2 row 2;

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

[0161] On one side of the No. 1 combined insulating block, a row (several) No. 2 extension sections of the metal mesh layer 10 of the No. 2 insulating block 11 are put on the No. 2 bolts 9 on the No. 2 row, 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 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 body 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 insulating blocks 11 are installed.

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

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

[0167] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope 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 which are sequentially arranged on the outer plate (1) of the tank body; 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 section 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) which are sequentially arranged on the outer plate (1) of the tank body; 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 a section thereof extending to the outside of the inner loose insulating layer (2) bulges outwards 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 through 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 body 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 No. 2 bolt (9) and is used to control the thickness of the inner loose insulating 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 matched 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 insulating layer, the metal mesh layer and the dense insulating layer of the No. 1 insulating 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 insulating layer and the metal mesh layer in sequence outwards; 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 a cryogenic storage tank, characterized in that: It 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.

10. A construction method for a double-layer composite plate-type insulation system for a cryogenic storage tank, based on the double-layer composite plate-type insulation system for a cryogenic storage tank according to any one of claims 8 to 9, characterized in that: The following steps are involved: Step 1: Marking the outer surface of the tank outer plate (1) with lines to mark several different circumferences where the No. 1 bolt and the No. 2 bolt (9) are located, and then welding the No. 1 bolt and the No. 2 bolt (9) using stud welding; Then tighten the washer nut (15) onto the No. 2 bolt (9) to the specified height; Among them, the number of bolts on the circle where bolt No. 1 is located is 1; Around the circumference where the second bolt (9) is located, there are a certain number of bolts (9) distributed along the Y direction; The Tuesday of the circle adjacent to the Monday of the circle is the Tuesday of the circle No. 1, and the numbers of the Tuesdays of the circles along the positive direction of the Y direction and the negative direction of the Y direction are increased in sequence; Step 2: Install all No. 1 insulation blocks (12) to form a No. 1 combined insulation block: 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; 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; Step 3: Install a row of No. 2 insulation blocks (11) on both sides of the No. 1 combined insulation block simultaneously: The second extension section of the metal mesh layer (10) of each second insulating block (11) is placed on the second bolt (9) on the circumference of the first circle, then the gasket (7) is installed on the second bolt (9), and finally the second nut is screwed on to 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 at the same time; 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 circumference of the corresponding No. 2 circle; Step 4: Install two more rows of No. 2 insulation blocks (11) on both sides of the No. 1 combination insulation block: The second extension section of the metal mesh layer (10) of the second insulating block (11) is placed on the second bolt (9) on the circumference of a second circle, and then the gasket (7) is installed on the second bolt (9), and finally the second nut is screwed on, so that the second extension section of the second insulating block (11) in step 4 and the third extension section of the second insulating block (11) in step 3 are simultaneously fixed to the outer plate (1) of the tank.

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