Cold insulation structure of low-temperature liquid tank and mounting method

Abstract

The invention relates to a cold insulation structure of a low-temperature liquid tank and an installation method, the cold insulation structure comprises a cold insulation layer, the cold insulation layer is detachably connected with the inner wall of an outer tank of the low-temperature liquid tank through a fastener, the bottom of the cold insulation layer is provided with a bottom reinforcing plate, and the top of the cold insulation layer is provided with a top reinforcing plate; the bottom reinforcing plate is connected with the inner wall of an outer tank of the low-temperature liquid tank, and the top reinforcing plate is connected with the outer wall of an inner tank of the low-temperature liquid tank. The heat insulation performance, the installation method, the fixing mode and the inner tank stress condition of the cold insulation structure are considered, an operator carries out the design scheme of the cold insulation structure on an outer tank wall drawing in advance, multiple point positions are selected on the outer tank wall in advance, a fixing screw is fixed to each point position, and one cold insulation structure is fixed to every two fixing bolts; filling polyurethane foam after fixing, and covering a layer of aluminum foil tape on the surface after curing and stabilizing; the pre-embedded strip is fixed on the top reinforcing plate through a self-tapping screw; and finally, the corrugated plate of the inner tank wall is welded on the pre-embedded strip.

Description

Technical Field

[0001] The invention relates to a cold-insulating structure and an installation method of a cryogenic liquid tank, belonging to the technical field of LNG storage tanks. Background Art

[0002] Whether it is a ship cargo tank or a large land tank, the most important part that affects its energy consumption and functionality is the cold insulation structure. As the core part that connects the outer tank and the inner tank, the cold insulation structure needs to consider the insulation performance, installation method, fixing mode, and stress of the inner tank. Once the design is unreasonable, it will cause a lot of economic losses. Summary of the invention

[0003] In response to the above technical problems, the present invention provides a cold insulation structure and installation method for a cryogenic liquid tank. The present invention takes into account the thermal insulation performance, installation method, fixing mode, and stress conditions of the inner tank of the cold insulation structure, greatly improving the performance of isolating the cryogenic liquid tank from the outside and avoiding economic losses.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A cold preservation structure for a cryogenic liquid tank, comprising: A cold insulation layer, wherein the cold insulation layer is detachably connected to the outer tank inner wall of the cryogenic liquid tank through fasteners, a bottom reinforcement plate is provided at the bottom of the cold insulation layer, and a top reinforcement plate is provided at the top, the bottom reinforcement plate is connected to the outer tank inner wall of the cryogenic liquid tank, and the top reinforcement plate is connected to the inner tank outer wall of the cryogenic liquid tank.

[0005] In the cold-insulation structure of the cryogenic liquid tank, preferably, the cold-insulation layer and the top reinforcing plate are provided with grooves for accommodating the fasteners, and the notches of the grooves are filled with foaming material.

[0006] In the cold-keeping structure of the cryogenic liquid tank, preferably, the foam material is sealed with an adhesive tape.

[0007] In the cold-keeping structure of the cryogenic liquid tank, preferably, the tape is an aluminum foil tape.

[0008] The cold-keeping structure of the cryogenic liquid tank is preferably such that a pre-buried groove is provided on the top reinforcing plate.

[0009] In the cold-keeping structure of the cryogenic liquid tank, preferably, an embedded bar is installed in the embedded groove.

[0010] The cold-insulation structure of the cryogenic liquid tank is preferably such that the inner tank corrugated plate is welded to the position of the embedded strip.

[0011] In the cold-insulation structure of the cryogenic liquid tank, preferably, the cold-insulation layer comprises any one of a rigid polyurethane foam layer, a polystyrene foam layer, a polypropylene foam layer or a phenolic resin foam layer.

[0012] In the cold-insulating structure of the cryogenic liquid tank, preferably, the foaming material is a polyurethane foaming material.

[0013] A second aspect of the present invention provides a method for installing a cold preservation structure of a cryogenic liquid tank, comprising the following steps: The cold-insulation structure is fixedly connected to the inner wall of the outer tank by fasteners, the notch position of the fasteners is filled with polyurethane foam material, and after filling, it is sealed with aluminum foil tape, and embedded strips are installed at the embedded groove position on the top reinforcement plate of the cold-insulation structure, and the inner tank corrugated plate is welded to the position of the embedded strips.

[0014] The present invention adopts the above technical solution, which has the following advantages: The present invention takes into account the thermal insulation performance, installation method, fixing mode, and stress condition of the inner tank of the cold insulation structure. The operator designs the cold insulation structure on the outer tank wall drawing in advance, selects multiple points on the outer tank wall in advance, fixes a fixing screw at each point, and fixes a piece of the cold insulation structure on every two fixing bolts, which are fixed with fixing bolts, fixing nuts, and fixing washers; after fixing, polyurethane foam is filled, and after solidification and stabilization, a layer of aluminum foil tape is covered on the surface; the embedded strip is fixed to the top reinforcement plate by self-tapping screws, and finally the corrugated plate of the inner tank wall is welded to the embedded strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a cryogenic liquid tank cold preservation structure provided by an embodiment of the present invention; The reference numerals in the figures are as follows: 1-Inner wall of outer tank; 2-Bottom reinforcement plate; 3-Hard polyurethane foam; 4-Fixing bolts; 5-Fixing washers; 6-Fixing nuts; 7-Polyurethane foam material; 8-Aluminum foil tape; 9-Top reinforcement plate; 10-Embedded strips. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0017] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0018] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0019] At present, China has become the world's largest importer of LNG, and the demand for land-based liquid tanks and marine liquid tanks is gradually increasing. Whether it is a marine liquid cargo tank or a large land-based liquid tank, the most important part affecting its energy consumption and functionality is the cold insulation structure. As the core part of the outer tank and the inner tank, the cold insulation structure needs to consider the insulation performance, installation method, fixing mode, and stress of the inner tank. Once the design is unreasonable, it will cause a lot of economic losses.

[0020] Based on the above technical problems, the present invention provides a cold insulation structure and installation method for a cryogenic liquid tank. The present invention takes into account the thermal insulation performance, installation method, fixing mode, and stress conditions of the inner tank of the cold insulation structure, greatly improving the performance of isolating the cryogenic liquid tank from the outside and avoiding economic losses.

[0021] like Figure 1 As shown, the cold preservation structure of the cryogenic liquid tank involved in the present invention comprises: The cold insulation layer is detachably connected to the outer tank inner wall 1 of the cryogenic liquid tank through fasteners (fixing bolts 4, fixing washers 5 and fixing nuts 6). A bottom reinforcement plate 2 is provided at the bottom of the cold insulation layer and a top reinforcement plate 9 is provided at the top. The bottom reinforcement plate 2 is connected to the outer tank inner wall 1 of the cryogenic liquid tank, and the top reinforcement plate 9 is connected to the inner tank outer wall of the cryogenic liquid tank.

[0022] Furthermore, grooves for accommodating fasteners are provided on the cold insulation layer and the top reinforcing plate 9 , and the notches of the grooves are filled with foaming material, and the foaming material is sealed with tape, which is an aluminum foil tape 8 .

[0023] Furthermore, an embedded groove is provided on the top reinforcing plate 9, an embedded bar 10 is installed in the embedded groove, and the inner tank corrugated plate is welded to the position of the embedded bar 10.

[0024] Furthermore, the cold-insulating layer includes any one of a rigid polyurethane foam layer, a polystyrene foam layer, a polypropylene foam layer or a phenolic resin foam layer, and the foaming material is a polyurethane foam material 7 .

[0025] The second aspect of the present invention provides an installation method for a cold insulation structure of a cryogenic liquid tank: the cold insulation structure is fixedly connected to the outer tank inner wall 1 of the cryogenic liquid tank by two fixing bolts 4, a fixing washer 5 and a fixing nut 6, the fixing nut 6 can be fixed to the fixing bolt 4 by a tool socket wrench, the notch position at the end of the fixing bolt 4 is filled with polyurethane foam material 7, and after filling, it is sealed with aluminum foil tape 8, the top reinforcement plate 9 of the cold insulation structure should be grooved, the embedded strip 10 is installed at the groove position, and the inner tank corrugated plate is welded at the position of the embedded strip 10.

[0026] The present invention takes into account the thermal insulation performance, installation method, fixing mode, and stress condition of the inner tank of the cold insulation structure. The operator designs the cold insulation structure on the outer tank wall drawing in advance, selects multiple points on the outer tank wall in advance, fixes a fixing screw at each point, and fixes a piece of the cold insulation structure on every two fixing bolts, which are fixed with fixing bolts, fixing nuts, and fixing washers; after fixing, polyurethane foam is filled, and after solidification and stabilization, a layer of aluminum foil tape is covered on the surface; the embedded strip is fixed to the top reinforcement plate by self-tapping screws, and finally the corrugated plate of the inner tank wall is welded to the embedded strip.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold preservation structure for a cryogenic liquid tank, characterized in that: include: A cold insulation layer, the cold insulation layer being detachably connected to the outer tank inner wall (1) of the cryogenic liquid tank via a fastener, the cold insulation layer being provided with a bottom reinforcement plate (2) at the bottom and a top reinforcement plate (9) at the top, the bottom reinforcement plate (2) being connected to the outer tank inner wall (1) of the cryogenic liquid tank, and the top reinforcement plate (9) being connected to the inner tank outer wall of the cryogenic liquid tank.

2. The cold preservation structure of the cryogenic liquid tank according to claim 1, characterized in that: The cold-insulating layer and the top reinforcing plate (9) are provided with grooves for accommodating the fasteners, and the notches of the grooves are filled with foaming material.

3. The cold preservation structure of the cryogenic liquid tank according to claim 2, characterized in that: The foaming material is sealed with adhesive tape.

4. The cold preservation structure of the cryogenic liquid tank according to claim 3, characterized in that: The adhesive tape is an aluminum foil adhesive tape (8).

5. The cold preservation structure of the cryogenic liquid tank according to claim 1, characterized in that: The top reinforcing plate (9) is provided with an embedded groove.

6. The cold preservation structure of the cryogenic liquid tank according to claim 1, characterized in that: An embedded bar (10) is installed in the embedded groove.

7. The cold preservation structure of the cryogenic liquid tank according to claim 1, characterized in that: The position of the embedded strip (10) is welded to the inner tank corrugated plate.

8. The cold preservation structure of the cryogenic liquid tank according to claim 1, characterized in that: The cold-insulating layer includes any one of a rigid polyurethane foam layer, a polystyrene foam layer, a polypropylene foam layer or a phenolic resin foam layer.

9. The cold preservation structure of the cryogenic liquid tank according to claim 2, characterized in that: The foaming material is a polyurethane foaming material (7).

10. A method for installing a cold-insulation structure of a cryogenic liquid tank, characterized in that: The steps include: The cold-insulating structure is fixedly connected to the inner wall (1) of the outer tank by fasteners, the notch position of the fasteners is filled with polyurethane foam material (7), and after filling, it is sealed with aluminum foil tape (8), and an embedded strip (10) is installed at the embedded slot position on the top reinforcement plate (9) of the cold-insulating structure, and the position of the embedded strip (10) is welded to the inner tank corrugated plate.

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