SU900070A1 - Isothermic reservoir - Google Patents

Description

(54) TEMPERATURE TANK

I

The invention relates to a storage container for liquefied gases, including cryogenic gases, in particular to heat insulated tanks.

Tanks are known that contain inner and outer shells and interposed heat insulation that reduces heat leakage through the walls of the tank, in which one or more reflective radiation of metal screens 1 is placed in order to reduce heat influx from the side of the vertical walls.

However, such a design does not allow for the regulation of the temperature stratification of the liquid. The temperature stratification of the liquid adversely affects the loss of it during storage, since the evaporation of the liquid occurs from the upper, most heated layer.

Displacement systems using convective fluid flow are also known, and the fluid is heated by external heating fry by degrading the thermal insulation quality in the lower part of the tank. They refer to tanks with a large capacity from 1 to 100 thousand meters intended for liquefied natural gas 2.

The disadvantage of such structures is the constant-increased external heat influx, and, as a consequence, the evaporation rate of the liquid, as well as the inability to regulate the heat influx, due to which they are used only in relatively small

10 tanks.

The closest to the proposed technical entity is an isothermal tank, including outer and inner shells made of threaded reinforced concrete or steel, a heat insulating layer made of perlite between the shells and a radiation screen made of foil and glued to the inner sheath 3.

20

Claims (3)

The disadvantages of this reservoir are the increased losses due to evaporation of the liquid, due to temperature stratification of the liquid, as well as aging (fading) radiation shields during operation. Replacement screens and regulation of heat gain with this design is impossible. The purpose of the invention is to reduce fluid loss. The goal is achieved by the fact that an isothermal tank, including outer and inner shells, as well as a heat insulating layer placed in the space between the shells, and radiation shields, equipped with means for vertical movement and freely suspended in the interstitial space, while means for vertical movement are made in the form of rotating drums with pneumatic drive, and the screens themselves are flexible and provided in the lower part of rpyaaivw. FIG. 1 shows a reservoir, a cross section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a variant of placing two screens between the shells of the tank; in fig. 4 shows a section BB in FIG. 3. Between the shells 1 and 2 is placed a heat insulating layer 3. In the cylindrical part of the tank between the shells there is a free space 4, necessary to mount the insulating layer 3. In this space, the screens 5 are empty in the form of separate sheets of elastic material , for example, an aluminized film of polyethylene terephthalate fixed on a glass fiber substrate sh. The d / 1 lifting device consists of drums 6 fixed on the outer casing 1 by means of brackets 7, through which pipelines 8 are passed under the water and discharge of compressed gas rotating the pneumatic actuator, for example, inside the drums. At the bottom of each separated screen 5, cargo 9 is strengthened. Access to the interstitial space 4 is possible through manholes 10. During operation, the tank is filled with liquefied gas. When a temperature separation of the liquid, which is determined by the corresponding devices, occurs, all or part of the screens 5 are raised, due to which the heat influx to the lower, cooler layers of the liquid increases, they are heated, and convective flows are formed in the mass of the liquid. Replacing the Bepxvrax - layers with liquid from the lower layers, as a rule, with a cooler one, provides for the condensation of vapors from the vapor space and, thereby, a decrease in evaporation. Depending on the liquid level in the tank and the temp. The perforations of its layers of screens 5 are raised to a particular height, which regulate the heat gain and liquids. When tarnishing (aging) of the screens 5, they are replaced during preventive maintenance of the tank using hatches 10. In case the insulation is attached to the warm wall of the shell 1, the screens 5 are placed between the inner shell 2 and the insulation layer 3. The pneumatic drive of the drums, on which the screens are nassed, not only provides security, but also compared with, for example, an electric drive with the amount of heat applied to the interstitial space. as throttling of the gas in the pneumatic drive leads to a decrease in its temperature. In addition, pre-cooled gas can be supplied to the pneumatic drive. Placing one or several screens in the internal space not only reduces radial heat transfer, but also significantly limits the free convective circulation movement of gas in the interstitial space and thereby increases its effective thermal resistance. Claim 1. Isothermal reservoir dowel, including outer and inner shells placed in the space between the shell of the heat insulating layer and the radiation shields, characterized in that the screens are equipped with a means for vertical alternation. freely suspended in the space between the shells. 2. The tank according to claim 1, in which the means for the vertical movement of the screens are discharged in the form of rotating drums with a pneumatic actuator, the screens are made flexible and equipped with Ipyses fixed in their lower part. Sources of information taken into consideration during the examination 1.Patent of France No., cl. F 17 C 3/02, 1976. 2. The patent of Germany number 2218602, class, 17 d, 3, 1973. 3. The patent of Great Britain No. 144835), cl. F 4 P, 1974. S 7 5 J I A-A Phage.1 I.