Cold insulation structure of full-capacity bimetal low-temperature storage tank

Abstract

The utility model relates to the technical field of low-temperature storage tank cold insulation, and provides a full-capacity bimetal low-temperature storage tank cold insulation structure which comprises a low-temperature steel outer tank, a low-temperature steel inner tank, a secondary shielding layer, a cold insulation system, a metal protection layer and a steam isolation layer. The low-temperature steel outer tank comprises an outer tank body and a bottom ring beam, a bearing plate used for containing the low-temperature steel inner tank is arranged in the outer tank body, a heat preservation cavity is formed between the outer tank body and the bearing plate, and a secondary shielding layer is installed in the heat preservation cavity. The low-temperature steel inner tank comprises an inner tank body and a suspended ceiling, an annular cavity used for slowing down heat conduction is formed between the outer tank body and the inner tank body, and the suspended ceiling is located at the top end of the annular cavity; the cold insulation system comprises a bottom cold insulation layer, an outer wall cold insulation layer and a suspended ceiling cold insulation layer, a metal protection layer is arranged on the inner side of the outer wall cold insulation layer, the cold insulation layers are arranged, cold capacity damage is relieved, and meanwhile dust pollution caused by perlite mineral powder serving as a traditional cold insulation material is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of cold preservation of low-temperature storage tanks, in particular to a full-capacity bimetallic low-temperature storage tank cold preservation structure. Background Art

[0002] Cryogenic storage tanks are vertical or horizontal double-layer vacuum insulated storage tanks used to store low-temperature or ultra-low-temperature media such as liquefied hydrocarbons or liquid oxygen, nitrogen, argon, ammonia, carbon dioxide and natural gas. Since the temperature is related to the phase state, stability and evaporation rate of the storage medium, the design of the cold storage system is crucial to the safety of the storage tank.

[0003] At present, for a full-containment cryogenic storage tank with a typical structure, it generally includes an outer tank, an inner tank, and a cold insulation structure between the inner and outer tanks. Among them, the cold insulation system of the cryogenic storage tank is composed of the cold insulation structure between the inner and outer tank walls, the ceiling cold insulation layer and the tank bottom cold insulation structure. The cold insulation effect between the inner and outer tank walls is usually achieved by filling perlite between the inner and outer tanks.

[0004] However, when the storage tank is exposed to cold during operation, the tank body may shrink. At this time, the perlite between the inner and outer tanks will continue to settle under its own gravity, resulting in a lack of perlite between the top of the inner tank and the outer tank for cold preservation, causing the tank body to leak cold, which may cause damage to the tank structure or boiling of the internal low-temperature medium, posing a major safety hazard. At the same time, filling the perlite also makes subsequent maintenance and warranty of the tank difficult.

[0005] In view of this, we proposed a full-containment bimetallic cryogenic storage tank cold preservation structure. Utility Model Content

[0006] The utility model aims to provide a full-capacity bimetallic low-temperature storage tank cold preservation structure to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model provides a full-capacity bimetallic cryogenic storage tank cold-insulation structure, comprising a cryogenic steel outer tank, a cryogenic steel inner tank, a cold-insulation system and a metal protective layer; the cryogenic steel outer tank comprises an outer tank body and a bottom ring beam, a load-bearing plate for placing the cryogenic steel inner tank is arranged inside the outer tank body, and a heat-insulating cavity is formed between the outer tank body and the load-bearing plate; a secondary shielding layer is installed in the heat-insulating cavity; the cryogenic steel inner tank is installed in the cryogenic steel outer tank, the cryogenic steel inner tank comprises an inner tank body and a suspended ceiling, and an annular cavity for slowing down heat conduction is formed between the outer tank body and the inner tank body so that the cryogenic steel inner tank and the cryogenic steel outer tank are not in direct contact, thereby slowing down heat conduction The suspended ceiling is located at the top of the annular chamber, and the suspended ceiling is used to seal the annular chamber to ensure the airtightness of the annular chamber; the cold insulation system includes a bottom cold insulation layer, an outer wall cold insulation layer and a suspended ceiling cold insulation layer, and the cold insulation system is composed of foam glass bricks, which have good thermal insulation properties and can effectively isolate the transfer of temperature. The bottom cold insulation layer is located in the insulation cavity, and the outer wall cold insulation layer is installed on the outer wall of the outer tank body. A metal protective layer is provided on the outside of the outer wall cold insulation layer, and the suspended ceiling cold insulation layer is located above the suspended ceiling. The cold insulation system realizes all-round cold insulation of the low-temperature storage tank through the bottom cold insulation layer, the outer wall cold insulation layer and the suspended ceiling cold insulation layer.

[0009] Preferably, an inspection opening is provided on the suspended ceiling so that workers can enter the annular chamber to inspect and maintain the inner tank and the outer tank, thereby shortening the maintenance period.

[0010] Preferably, the ceiling cold insulation layer is 200mm-500mm.

[0011] Preferably, the secondary shielding layer includes a secondary bottom, a thermal corner protection vertical plate and a thermal corner protection ring plate, the secondary bottom is located at the middle end of the insulation cavity, and the thermal corner protection vertical plate and the thermal corner protection ring plate are fixedly connected to the outer wall cold insulation layer.

[0012] Preferably, the metal protective layer includes round steel and a gasket, the round steel is fixedly connected to the outer wall cold insulation layer, and the gasket is fixedly installed on the round steel.

[0013] Preferably, the steam isolation layer includes an anti-pressure ring, an anti-pressure plate and a vault plate; the anti-pressure plate is fixedly connected to the inner tank body, and the vault plate is located above the ceiling insulation layer; the anti-pressure plate is connected to the vault plate through the anti-pressure ring.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The cold-insulating structure slows down the loss of cold capacity of the low-temperature medium in the pipe through the annular chamber formed by the low-temperature steel outer tank and the low-temperature steel inner tank. At the same time, by setting the outer wall cold-insulating layer as the cold-insulating material, the problem of dust pollution is eliminated and the weight and volume of the cold-insulating material are reduced.

[0016] 2. The cold-keeping structure achieves cold-keeping stability through the outer wall cold-keeping layer, which prevents the outer wall cold-keeping layer from falling off with the contraction and expansion of the low-temperature steel outer tank and the low-temperature steel inner tank. It can play a cold-keeping role for a long time and eliminates the safety hazards of low-temperature storage tank structure damage and boiling of internal low-temperature medium caused by cold leakage of the low-temperature steel outer tank and the low-temperature steel inner tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a partial enlarged view of the utility model.

[0019] In the figure:

[0020] 1. Low temperature steel outer tank; 11. Outer tank body; 12. Load-bearing plate; 13. Insulation chamber;

[0021] 2. Low temperature steel inner tank; 21. Inner tank body; 22. Suspended ceiling; 221. Inspection port; 23. Annular chamber;

[0022] 3. Secondary shielding layer; 31. Secondary bottom; 32. Thermal corner protection vertical plate; 33. Thermal corner protection ring plate;

[0023] 4. Cold insulation system; 41. Bottom cold insulation layer; 42. Outer wall cold insulation layer; 43. Ceiling cold insulation layer;

[0024] 5. Metal protective layer; 51. Round steel; 52. Washer;

[0025] 6. Steam isolation layer; 61. Anti-pressure ring; 62. Anti-pressure plate; 63. Vault plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figures 1 to 2 As shown, the utility model provides a full-containment bimetallic cryogenic storage tank cold preservation structure, comprising: a cryogenic steel outer tank 1, a cryogenic steel inner tank 2, a cold preservation system 4 and a metal protective layer 5, the cryogenic steel outer tank 1 comprises an outer tank body 11 and a bottom ring beam, a bearing plate 12 for placing the cryogenic steel inner tank 2 is provided inside the outer tank body 11, and a heat preservation cavity 13 is formed between the outer tank body 11 and the bearing plate 12; a secondary shielding layer 3 is installed in the heat preservation cavity 13;

[0028] The low-temperature steel inner tank 2 is installed in the low-temperature steel outer tank 1. The low-temperature steel inner tank 2 and the low-temperature steel outer tank 1 are installed coaxially and are used to store low-temperature media. The low-temperature steel inner tank 2 includes an inner tank body 21 and a suspended ceiling 22. An annular chamber 23 for slowing down heat conduction is formed between the outer tank body 11 and the inner tank body 21. The annular chamber 23 prevents the low-temperature steel inner tank 2 from directly contacting the low-temperature steel outer tank 1, thereby slowing down heat conduction. At the same time, the width of the annular chamber 23 is 100-150mm, so that there is enough free space in the outer tank body 11, and the glass foam bricks do not generate additional external pressure on the inner tank body 21. The inner tank body 21 does not need to be additionally provided with a reinforcement ring. The space of the annular chamber 23 is convenient for the installation, construction and maintenance of the low-temperature steel inner tank 2. The suspended ceiling 22 is located at the top of the annular chamber 23. The suspended ceiling 22 adopts a frame structure or a plate welding assembly structure.

[0029] The suspended ceiling 22 is used to seal the annular chamber 23 to ensure the airtightness of the annular chamber 23; an inspection port 221 is provided on the suspended ceiling 22 so that workers can enter the annular chamber 23 to inspect and maintain the cryogenic steel inner tank 2 and the cryogenic steel outer tank 1, thereby shortening the maintenance period;

[0030] The cold-insulating system 4 includes a bottom cold-insulating layer 41, an outer wall cold-insulating layer 42 and a ceiling cold-insulating layer 43. The cold-insulating system 4 is composed of foam glass bricks, which avoids the dust pollution problem when perlite is used as the cold-insulating layer. At the same time, the weight and volume of the cold-insulating material can be greatly reduced, so that there is enough space in the annular chamber 23, ensuring the effect of slowing down the temperature of the annular chamber 23, so that the annular chamber 23 can play a cold-insulating role for a long time;

[0031] The bottom cold insulation layer 41 is located in the heat preservation cavity 13, and is used to slow down the cold loss rate of the bottom of the low-temperature steel outer tank 1, and ensure the heat preservation effect of the bottom. The secondary shielding layer 3 includes a secondary bottom 31, a heat corner protection vertical plate 32 and a heat corner protection ring plate 33. The secondary bottom 31 is located at the middle end of the heat preservation cavity 13. The heat corner protection vertical plate 32 and the heat corner protection ring plate 33 are fixedly connected to the outer wall cold insulation layer 42. The secondary shielding layer 3 further isolates the loss of cold air, and cooperates with the bottom cold insulation layer 41 to enhance the cold preservation effect.

[0032] The outer wall cold insulation layer 42 is installed on the outer wall of the outer tank body 11, so that the outer wall cold insulation layer 42 can slow down the cold loss in the low-temperature steel outer tank 1 without contacting the low-temperature medium. The outer wall cold insulation layer 42 is provided with a metal protective layer 5, and the metal protective layer 5 protects the outer wall cold insulation layer 42 to prevent the outer wall cold insulation layer 42 from being damaged, thereby causing the cold insulation effect to decrease. The metal protective layer 5 includes a round steel 51 and a gasket 52. The round steel 51 is fixedly connected to the outer wall cold insulation layer 42, and the gasket 52 is fixedly installed on the round steel 51. The ceiling cold insulation layer 43 is located above the ceiling 22, and the ceiling cold insulation layer 43 is used to prevent the upper end of the low-temperature steel inner tank 2 and the annular chamber 23 from leaking cold;

[0033] The steam insulation layer 6 includes a pressure-resistant ring 61, a pressure-resistant plate 62 and a vault plate 63; the pressure-resistant plate 62 is fixedly connected to the inner tank body 21, and the vault plate 63 is located above the suspended ceiling cold insulation layer 43; the pressure-resistant plate 62 is connected to the vault plate 63 through the pressure-resistant ring 61, and the steam insulation layer 6 further enhances the cold insulation effect of the suspended ceiling cold insulation layer 43, thereby avoiding the occurrence of cold leakage at the top.

[0034] When using a full-containment bimetallic cryogenic storage tank insulation structure of this embodiment, after the foundation and concrete pedestal are cast, the bottom ring beam is cast above the pedestal and the bottom insulation layer 41 (foam glass brick) is laid, and then the mechanical construction of the cryogenic steel outer tank 1 and the cryogenic steel inner tank 2 is started. After the mechanical construction is completed, water is first injected into the cryogenic storage tank inner tank for a water pressure test to detect the structural strength of the cryogenic storage tank. After the test is completed, the cryogenic storage tank is dried, and nitrogen is filled into the cryogenic steel outer tank 1 and the cryogenic steel inner tank 2 to discharge the water in the cryogenic steel outer tank 1 and the cryogenic steel inner tank 2. Steam is used to prevent the components from being corroded by water vapor or the water vapor from freezing on the surface of the cold insulation material (ceiling insulation layer 43) to cause damage to the cold insulation material. The low-temperature steel outer tank 1 is then sealed and pressurized to perform an air pressure test on the low-temperature steel outer tank 1. An outer wall insulation layer 42 is then set on the outer side wall of the low-temperature steel outer tank 1, and a metal protective layer 5 is installed; at the same time, a ceiling insulation layer 43 is laid on the ceiling 22; finally, after the low-temperature storage tank is sealed and nitrogen is replaced, the low-temperature medium can be filled. After the low-temperature medium enters the low-temperature steel inner tank 2, it will be partially vaporized, thereby replacing the nitrogen in the low-temperature steel inner tank 2.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A full-capacity bimetallic cryogenic storage tank cold preservation structure, characterized in that: It comprises a cryogenic steel outer tank (1), a cryogenic steel inner tank (2), a secondary shielding layer (3), a cold preservation system (4), a metal protective layer (5) and a steam insulation layer (6); The low-temperature steel outer tank (1) comprises an outer tank body (11) and a bottom ring beam, a bearing plate (12) for placing the low-temperature steel inner tank (2) is provided inside the outer tank body (11), a heat preservation cavity (13) is formed between the outer tank body (11) and the bearing plate (12), and a secondary shielding layer (3) is installed in the heat preservation cavity (13); The low-temperature steel inner tank (2) is installed in the low-temperature steel outer tank (1), the low-temperature steel inner tank (2) comprises an inner tank body (21) and a suspended ceiling (22), an annular chamber (23) for slowing down heat conduction is formed between the outer tank body (11) and the inner tank body (21), and the suspended ceiling (22) is located at the top of the annular chamber (23); The cold insulation system (4) comprises a bottom cold insulation layer (41), an outer wall cold insulation layer (42) and a suspended ceiling cold insulation layer (43); the cold insulation system (4) is composed of foam glass bricks; the bottom cold insulation layer (41) is located in the heat preservation cavity (13); the outer wall cold insulation layer (42) is installed on the inner wall of the outer tank body (11); a metal protective layer (5) is provided on the inner side of the outer wall cold insulation layer (42); and the suspended ceiling cold insulation layer (43) is located above the suspended ceiling (22).

2. The cold preservation structure according to claim 1, characterized in that: The suspended ceiling (22) is provided with an inspection opening (221).

3. The cold preservation structure according to claim 1, characterized in that: The ceiling cold insulation layer (43) is 200mm-500mm.

4. The cold preservation structure according to claim 1, characterized in that: The secondary shielding layer (3) comprises a secondary bottom (31), a thermal corner protection vertical plate (32) and a thermal corner protection ring plate (33); the secondary bottom (31) is located at the middle end of the heat preservation cavity (13); and the thermal corner protection vertical plate (32) and the thermal corner protection ring plate (33) are fixedly connected to the outer wall cold preservation layer (42).

5. The cold preservation structure according to claim 1, characterized in that: The metal protective layer (5) comprises a round steel (51) and a gasket (52); the round steel (51) is fixedly connected to the outer wall cold insulation layer (42); and the gasket (52) is fixedly installed on the round steel (51).

6. The cold-keeping structure according to claim 1, characterized in that: It also includes a steam insulation layer (6), the steam insulation layer (6) including an anti-pressure ring (61), an anti-pressure plate (62) and a dome plate (63); the anti-pressure plate (62) is fixedly connected to the inner tank body (21), and the dome plate (63) is located above the suspended ceiling cold insulation layer (43); the anti-pressure plate (62) is connected to the dome plate (63) via the anti-pressure ring (61).

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