SU1432307A1 - Thermal insulation structure of isothermic reservoir - Google Patents

Abstract

The invention relates to a cryogenic technique, in particular to storage tanks for liquefied gases. The purpose of the invention is to reduce material consumption and size. The heat insulating structure of an isothermal tank includes outer and inner shells, between which a heat insulating layer of powdered heat insulating material is enclosed and a compensation layer of fibrous heat insulating material fixed on the outer surface of the inner wall. In the upper part of the structure there is a shrinkage compensator, made in the form of reflecting screens, fixed with the help of brackets that are mounted on the outer wall of the tank, as well as a horizontal partition separating the interstitial space from the dome and preventing powder spilling. A hatch is provided for filling the heat insulating material powder S. As the powder material precipitates during operation, the heat shield of the isothermal tank in the upper part is carried out by screens. 2 Il. (L

Description

This invention relates to a cryogenic technique, in particular to the thermal insulation of insulated tanks for the storage of liquefied gases.

The purpose of the invention is to reduce metal consumption and size.

FIG. Figure 1 shows the proposed thermal insulation design of a thermal tank, front view; FIG. 2 is a section A-A in FIG. 1,

The heat insulating structure of an isothermal tank includes 1 and 2 inner shells, between which there is an isolated cavity 3, in which a heat insulating layer of powdered heat insulating material and KojvmeHcaTop 4 located in the upper part of the design, embodied in the form of concentric reflecting screens 5 of aluminum sheet with thickness Ou3–150 MMs fixed with the aid of b 5 brackets which are mounted on the outer wall of the tank, as well as a horizontal partition 7 separating the interwall wall space 8 from inter-dome space 9, a hatch (not shown) is provided for backfilling thermal insulation material. 5

The installation of the thermal insulation structure is carried out in the following sequence.

After completion of the mechano-assembly work, the compensation layer 10 is hung on the outer side of the inner shell 2. Next, the powdered heat-insulating material is filled up through the hatch into the wall space 8 to a level 2-3 meters below the interface line of the inner shell 2 the dome. Then the bearing brackets 6 are installed and the reflection screens are visited 5. After the reflecting screens 5 are mounted, the space between them is filled with a heat insulating powder material. Then, the annular gap between the inner and outer walls closes on top of the horizontal partition 7, separating the interwall 8 and inter-dome 9 spaces,

The proposed design will allow eliminating excess heat-induced pHj resulting from the formation of an uninsulated cavity in the upper part of the structure during the deposition of heat insulating backfill.

Q

g 0 5 o

Q j

five

0

From the operating experience of isothermal storages, it is known that the amount of precipitation reaches 10-15% of the heat insulating filling height, t, e, 2-3 m and more in tanks with a height of 20-25 m, a precipitator with a height of 2-3 m and a thickness of 0.5 -1.0 m on the basis of blocks made of fibrous material, mounted at the level of the upper edge of the inner container, requires a corresponding increase in the height of the outer wall and is practically difficult to implement, and the reliability of its uniform sedimentation along with shortening seems to be unrealistic due to friction with kineral- blocks on the wall and possible distortions.

At the same time, a shrinkage compensator based on reflecting screens is fixed in the upper part of the lateral insulation layer, which eliminates the need to create a ballast volume and reliably compensates for the draft of the thermal insulation layer of almost any size.

A precipitation compensator based on reflecting screens is not installed above the flare material, but directly in the layer of the powder material, which eliminates the need to create a ballast volume in the structure and leads to a decrease in the material consumption and tank dimensions. The peculiarity of the proposed tank design is that at the first stage of operation, the fully insulated heat insulation works, and the screen insulation of the compensator is put into operation as the heat-insulating backfill accumulates,

In the proposed solution, a horizontal partition prevents the powder material from shedding from the dome into the interstitial space in tanks with self-supporting internal Hbw dome.

Claims (1)

Invention Formula The heat insulating structure of an iso-thermal reservoir, including the outer and inner shells, between which there is an isolated cavity, is filled with a powder (thermal insulating material, with a shrinkage compensator located above the layer of powdered material, characterized in that 3U32307 in order to reduce metal consumption and gas, the structure is equipped with mining barriers, the compensator is made in the form of concentric heat-reflecting shields suspended on brackets. a horizontal partition separating the insulating cavity into the interstitial and inter-dome cavities. at the same time, the structure is provided with a horizontal wall dividing the insulating cavity into the inter-wall and inter-dome cavity. /// ///) / /// /  // 7 FIG. R   / U FIG. 2