CN107237976A - Metal full appearance tank - Google Patents

Abstract

The invention provides a metal full-containment tank, which comprises a main container, an outer container arranged on the periphery of the main container, and a secondary container arranged at intervals between the main container and the outer container; the top of the outer container is provided with an arched outer top Cover, the top of the secondary container is provided with an arched secondary top cover. In the metal full-containment tank of the present invention, the top of the secondary container does not need the support of the ceiling structure, which avoids the external container from bearing a large force, ensures the stability of the top structure of the storage tank, and simplifies the construction and installation operation of the top of the full-containment tank; at the same time A closed space can be formed between the outer container and the secondary container, which can be filled with insulation materials. When the main container leaks, the secondary container can hold the medium and realize sealing, and the external insulation material can also isolate the transfer of external heat. The heat transfer is blocked while preventing the medium from leaking again; in summary, the top construction operation of the metal full-containment tank of the present invention is simple, the top structure is stable, and the overall safety of the storage tank is high.

Description

Metal full containment tank

technical field

The invention relates to the field of low-temperature and cryogenic medium storage equipment, in particular to a metal full-capacity tank.

Background technique

Compared with single-containment tanks, full-containment tanks do not need cofferdams, which can effectively reduce the occupied area and have higher safety; at the same time, metal full-containment tanks can overcome the problems of high cost, long construction period and large equipment investment of concrete full-containment tanks. Therefore, metal full-containment tanks are more and more favored by customers such as small and medium-sized receiving stations, liquefaction plants, and peak-shaving stations in practical applications, and the market potential is huge.

The top of the existing metal full-containment tank is a suspended ceiling structure, and the suspended ceiling plate of the inner tank is suspended from the top of the outer tank through several tie rods. In addition, insulation materials are laid on the suspended ceiling plate, which causes a large force on the top of the storage tank, which not only increases It increases the difficulty of construction and easily affects the overall stability of the full-containment tank.

Contents of the invention

The object of the present invention is to provide a metal full-containment tank with simple top structure construction and high stability.

In order to achieve the above object, the present invention provides a metal full-containment tank, comprising a main container, an outer container arranged on the periphery of the main container, and a secondary container arranged at intervals between the main container and the outer container; the outer container The top of the container is provided with an arched outer cover, and the top of the secondary container is provided with an arched secondary cover.

Preferably, a heat insulation layer is formed between the outer container and the secondary container by filling a cold insulation material.

Preferably, the heat insulating layer is provided on the side interlayer between the outer container and the secondary container and between the outer top cover and the secondary top cover.

Preferably, the top end of the main container is open, and the top end of the main container is not higher than the bottom end of the secondary top cover.

Preferably, the side interlayer between the main container and the secondary container is hollow.

Preferably, the cold insulation material is pearlite, and the gaps between the pearlite are filled with nitrogen.

Preferably, both the outer container and the secondary container include a cylinder body and a bottom plate, and a heat insulating layer is provided between the bottom plate of the outer container and the bottom plate of the secondary container.

Preferably, the heat insulation layer is provided between the bottom plate of the secondary container and the bottom of the main container.

Preferably, the heat insulation layer includes a foam glass brick layer and a reinforced concrete layer.

Preferably, both the main container and the secondary container are made of austenitic stainless steel or 9% Ni steel, and the outer container is made of low alloy steel or carbon steel.

As can be seen from the foregoing technical scheme, the beneficial effects of the present invention are:

In the metal full-containment tank of the present invention, the top of the secondary container is provided with an arched secondary top cover, which does not require the support of the ceiling structure, avoids the external container from bearing a large force, ensures the stability of the top structure of the storage tank, and also simplifies the storage tank. The operation of construction and installation on the top of the tank; at the same time, a closed space can be formed between the outer container and the secondary container, which can be filled with insulation materials. When the main container leaks, the secondary container can hold the medium and achieve sealing, and the external insulation material can isolate External heat transfer, so the full-containment tank prevents the medium from leaking again while blocking heat transfer. In summary, the top construction operation of the metal full-containment tank of the present invention is simple, the top structure is stable, and the overall safety of the storage tank is high.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of a metal full-containment tank of the present invention.

Reference signs are explained as follows: 1. Metal full-containment tank; 11. Outer container; 111. Outer cylinder; 112. Outer bottom plate; 113. Outer top cover; 12. Secondary container; 121. Secondary cylinder; 122. Secondary top cover ; 123, secondary bottom plate; 13, main container; 131, T-shaped reinforcing ring; 132, inline reinforcing ring; 14, heat insulating layer; 15, heat insulating layer.

detailed description

Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various changes in different embodiments without departing from the scope of the present invention, and that the description and illustrations therein are illustrative in nature and not limiting. this invention.

In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The invention provides a metal full-containment tank, which can be used for normal-pressure storage of low-temperature and cryogenic media such as LNG below 30,000 m³, and is mainly used in engineering projects such as receiving stations, liquefaction plants, and gas peak regulation.

Referring to FIG. 1 , the metal full-containment tank 1 of this embodiment mainly includes: an outer container 11 , a secondary container 12 and a main container 13 . Wherein, the main container 13 is mainly used for containing low-temperature medium, the outer container 11 is arranged on the periphery of the main container 13 , and the secondary container 12 is arranged between the main container 13 and the outer container 11 at intervals.

The outer container 11 includes an outer cylinder body 111 and an outer bottom plate 112 disposed at the bottom of the outer cylinder body 111 . The outer cylinder 111 is a cylindrical structure with an arched outer roof 113 on the top; the outer container 11 is made of low alloy steel or carbon steel that can withstand the extreme minimum ambient temperature where the full containment tank is installed.

The secondary container 12 is a sealed structure, which is made of low temperature resistant austenitic stainless steel or 9% nickel steel. The secondary container 12 can be used for containing the leaked low-temperature medium, avoiding the direct contact between the cryogenic medium and the outer container 11 and causing the outer container 11 to be broken by cold, and the stability of the overall structure of the full-containment tank can be ensured.

The main part of the secondary container 12 is a secondary cylinder 121 of cylindrical structure, the top of the secondary cylinder 121 is provided with an arched secondary top cover 122, the bottom is provided with a plate-shaped secondary bottom plate 123, the secondary cylinder 121, the secondary top The cover 122 and the sub-bottom 123 together form a closed space. There is no gas phase communication between the sealed secondary container 12 and the outer container 11 , so the low-temperature gas in the secondary container 12 will not enter the outer container 11 .

In this embodiment, the secondary top cover 122 is directly arranged on the secondary cylinder body 121, so that there is no need to set a pull rod and a suspended ceiling to connect with the external top cover 113 of the outer container 11, thereby avoiding that the top of the outer container 11 bears a large force. The tension ensures the stability of the top of the tank and simplifies the operation of the construction and installation of the top of the full-containment tank.

The main container 13 is a vertical flat-bottomed cylindrical structure with an open top, so it does not need to bear the gas phase pressure. Same as the secondary container 12, the main container 13 is also made of low temperature resistant austenitic stainless steel or 9% nickel steel.

The inner surface of the cylinder of the main container 13 is provided with a reinforcing ring, and the reinforcing ring is divided into a T-shaped reinforcing ring 131 and a straight reinforcing ring 132, both of which are used to improve the stability of the overall structure of the main container 13.

In the metal full-containment tank 1 of this embodiment, the main container 13 includes a T-shaped reinforcing ring 131 and a plurality of straight-shaped reinforcing rings 132 . Wherein, the T-shaped reinforcing ring 131 is arranged on the top of the main container 13 , and a plurality of inline-shaped reinforcing rings 132 are arranged below the T-shaped reinforcing ring 131 and arranged at intervals along the height direction of the main container 13 .

In addition, the metal full-containment tank 1 also includes a thermal insulation layer 14 , which is a cold insulation material filled between the outer container 11 and the secondary container 12 . The cold insulation material is pearlite with good thermal insulation performance, and the gap between the pearlite sands is filled with dry nitrogen to prevent the thermal insulation performance from being dampened by the cold insulation material.

Preferably, in this embodiment, a heat insulating layer 14 is provided between the outer container 11 and the secondary container 12 and between the outer top cover 113 and the secondary top cover 122 . In this way, when the main container 13 leaks, the evaporated gas produced by the low-temperature medium will not transfer the cold energy to the outer top cover 113 after gathering at the top of the main container 13, preventing the outer top cover 113 from rupturing due to cold, and further ensuring the safety of accidents. When the situation, the stability of the outer tank structure.

When the metal full-containment tank 1 of this embodiment is in a normal working state, the main container 13 is filled with a low-temperature liquid medium, and the secondary container 12 with its peripheral airtight structure can withstand the corresponding gas phase pressure. The secondary container 12 can contain the low-temperature gas existing in the tank body in its closed space, so as to prevent the low-temperature gas from flowing into the outer container 11 and causing the steel outer container 11 to crack or deform.

When an accident condition occurs in the metal full-containment tank 1, that is, when the main container 13 leaks, the secondary container 12 of the sealed structure can contain all the low-temperature liquid, and the gas phase is sealed to avoid the outflow of the liquid and reduce the adverse effects caused by the accident condition. .

At the same time, after the low-temperature liquid leaked from the main container 13 contacts with the secondary container 12, vapor with a lower temperature will be generated. Since the periphery of the secondary container 12 is completely covered in the thermal insulation layer 14 with good temperature insulation performance, compared with the existing full-containment tank, the amount of low-temperature vapor generated when the metal full-containment tank 1 of this embodiment leaks is less .

The top of the main container 13 is not higher than the bottom of the secondary top cover 122, so that there is a larger gas phase space between the secondary container 12 and the top of the main container 13, thus providing a larger accommodating space for the evaporated gas produced by the low-temperature medium . After the low-temperature evaporated gas gradually gathers at the top of the main container 13, it is finally discharged through a pipe communicating with the external environment.

It should be noted that, in the metal full-containment tank 1 of this embodiment, the side interlayer between the main container 13 and the secondary container 12 is hollow, and no cold insulation material is filled therein. Therefore, the main container 13 does not need to bear the lateral pressure of the cold insulation material on its side wall, and at the same time, the construction cost of the full-containment tank can be reduced without reducing the safety performance of the tank body.

When a leakage accident occurs, the low temperature medium will not come into contact with the cold insulation material, which can reduce the evaporation loss of the low temperature medium; at the same time, it can also avoid the sinking of the cold insulation material soaked in the low temperature medium, resulting in the lack of cold insulation material on the top of the storage tank. The problem of cold impact caused by the contact of the low-temperature medium; in addition, it can also avoid the low-temperature impact caused by the liquid low-temperature medium reaching the outer container 11 due to the siphon phenomenon.

In addition, in order to prevent the low-temperature medium stored in the main container 13 from transferring cold energy to the outer bottom plate 112 through the bottom of the container, causing the outer bottom plate 112 to be damaged by cold, a heat insulating layer 15 is provided between the outer bottom plate 112 and the secondary bottom plate 123 in this embodiment. . The insulation layer 15 can form a barrier between the bottom of the main container 13 and the secondary container 12. The insulation layer 15 includes a foam glass brick layer and a reinforced concrete layer. depends on the size.

In the heat insulation layer 15, the reinforced concrete layer with a certain hardness can level and evenly distribute the load. Therefore, the heat insulation layer 15 laid on the bottom of the full-capacity tank can not only prevent heat from being transferred to the tank body, but also play the role of pressure load.

Furthermore, the heat insulation layer 15 is also provided between the sub-bottom plate 123 and the bottom of the main container 13. On the one hand, it can further strengthen the effect of insulating cold energy from being transferred to the outer container 11, and on the other hand, it can also prevent the heat from the external environment from passing through. The bottom of the full-capacity tank is conducted into the main container 13 to prevent the low-temperature medium from being heated and evaporated.

It can be seen that in the metal full-containment tank of this embodiment, the top of the secondary container is provided with an arched secondary roof, which does not require the support of the ceiling structure, which can prevent the outer container from bearing a large force and ensure the stability of the top structure of the storage tank. It simplifies the operation of construction and installation on the top of the full-containment tank, and saves the materials for tank construction; at the same time, an airtight space can be formed between the outer container and the secondary container, which can be filled with insulation materials. When the main container leaks, the secondary container can hold the medium And to achieve sealing, the external heat preservation material can isolate the transfer of external heat, so the full-containment tank prevents the medium from leaking again and blocks heat transfer at the same time. In summary, the top construction operation of the metal full-containment tank of the present invention is simple, and the top structure is stable. The overall safety of the storage tank is relatively high.

While this invention has been described with reference to several exemplary embodiments, it is understood that the terms which have been used are words of description and illustration, rather than of limitation. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be construed broadly within the spirit and scope of the appended claims. , all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims (10)

1. a kind of metal full appearance tank, it is characterised in that including primary tank, be arranged at the primary tank periphery outer container and It is arranged at intervals at the secondary container between the primary tank and outer container；The top of the outer container is provided with the outer top cover of arch, described The top of secondary container is provided with the secondary top cover of arch.

2. metal full appearance tank according to claim 1, it is characterised in that filled between the outer container and described container Cold insulation material formation heat insulation layer.

3. metal full appearance tank according to claim 1, it is characterised in that the side between the outer container and described container The heat insulation layer is equipped between portion's interlayer and the outer top cover and described top cover.

4. metal full appearance tank according to claim 1, it is characterised in that the top of the primary tank is open, the primary tank Top be not higher than the bottom of described top cover.

5. metal full appearance tank according to claim 1, it is characterised in that the side between the primary tank and described container Portion's interlayer is hollow.

6. metal full appearance tank according to claim 1, it is characterised in that the cold insulation material is pearlife, the pearly-lustre Gap between sand is filled with nitrogen.

7. metal full appearance tank according to claim 1, it is characterised in that the outer container and time container include cylinder and Thermal insulation layer is provided between the bottom plate of bottom plate, the bottom plate of the outer container and described container.

8. metal full appearance tank according to claim 7, it is characterised in that the bottom plate of described container and the primary tank The thermal insulation layer is provided between bottom.

9. the metal full appearance tank according to claim 7 or 8, it is characterised in that the thermal insulation layer includes foam glass brick layer And reinforced concrete floor.

10. metal full appearance tank according to claim 1, it is characterised in that the primary tank and time container are by austenite Stainless steel or 9%Ni steel are made, and the outer container is made up of low-alloy steel or carbon steel.