SU1560890A1 - Cryogenic tank - Google Patents

Abstract

The invention can be used in the construction of large cryogenic storage tanks for liquid cryogenic products. The purpose of the invention is to reduce the loss of the cryoproduct. For this, the tank is equipped with an additional shut-off valve 6 with a pneumatic actuator installed inside the vessel 1 at the inlet to the pipeline 4 of the lower drain, which in the area between the main and additional valves communicates with the inner vessel 1 through a heat-insulated tube with a hydraulic lock 8. The pneumatic actuator is designed as a bellows, one the end of which is rigidly connected to the bottom of the vessel, and the other with the valve stem. The valve seat is made in the form of a glass, the cavity of which communicates with the pipeline. The presence of a water seal 8 does not allow liquid cryoproduct from vessel 1 to flow into pipe 4. When valve 6 is closed, the supply of heat leaks from the environment to liquid cryoproduct through pipe 4 is reduced due to the presence of the heat insulating element 15 on the valve seat 6 and the heat insulating gasket 18 on his were 2 Il.

Description

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The invention relates to the field of ryogenic technology, in particular, to the construction of large cryogenic tanks for the storage of liquid cryogenic products.

The aim of the invention is to reduce the loss of the cryoproduct.

FIG. 1 shows a general view of the tank; in fig. 2 - node I on ig. one.

The cryogenic tank contains a bouton vessel 1, a casing 2, a heat insulating cavity 3, a pipeline 4 for the bottom discharge of a liquid cryoproduct, a nipple 5 for pressurization - gas recovery of the internal vessel 1, an additional Stop Valve 6 installed in the internal vessel 1 at the entrance to the pipeline 4, heat-insulated pipe- {su 7 discharge of liquid cryoproduct from pipeline 4 to internal vessel 1, one end of which is taken out of internal vessel 1 with hydraulic lock $, and the other end is removed from the lower end of pipeline 4, and pipe 9 th gas in the valve 6.

Pipeline 4 includes an internal tpy6y 10, an outer pipe 11, a heat insulating cavity 12, and a main rap valve 13H

Shut-off valve 6 (see Fig. 2) Consists of a fixed seat 14, made in the form of a glass with an insulated element 15, a movable plate 16 with a gasket 17 and a heat-insulated element 15, a movable barrel 16 with a gasket 17 and heat-insulated gasket 18, a pneumatic actuator 19 made in the form of a bellows, the stem 205 which is connected to the pneumatic actuator 19 and to the plate 16, Rack 21, made in the form of a glass with holes 22, one end of which is connected to the bottom of the vessel 1, ac

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the second one with the pneumatic actuator 19, the springs 23 and the nozzle 24 for supplying the control Gas to the pneumatic actuator 19 of the valve.

The operation of the cryogenic tank is as follows.

During long-term storage of a liquid cryoproduct in the tank, valves 13 and 6 are closed. The valve 6 is closed by supplying control gas to the pneumatic actuator 19, which has a dew point below the temperature of the stored cryoproduct. In this case, the bellows of the pneumatic actuator 19 is expanded, compresses the spring 23 and the plate 16 sits on the saddle 14, shutting off the pipeline 4.

As a result, the heat supply from the environment to the pipeline 4 forms a vapor phase of the cryoproduct, which raises the pressure in the pipeline 4 (between valves 13 and 6) and squeezes the liquid cryoproduct from the pipeline 4 into the vessel 1. The presence of a hydraulic seal 8 on the tube 7 does not allow the cryogenic liquid to flow from the vessel 1 to the pipeline 4. The supply of heat inflows from the environment to the liquid cryogenic product through the internal pipe 10 of the pipe 4 is reduced due to the presence of the thermally insulated element 15 on the saddle 14 and the thermal insulation strip 18 on cages 16.

When filling up - draining the liquid cryoproduct from the tank, valves 6 and 13 open. Opening valve 6

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This is done by depressurizing the pneumatic actuator 19, while the spring 23 depresses the plate 16 from the seat 14 and connects the vessel 1 to the pipeline t.

In connection with the fact that in the storage mode of the liquid cryoproduct in the inner vessel 1 of the tank (see Fig. 1) the inner pipe 10 of the pipeline 4

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the bottom drain is under the liquid inlet, the heat influx from the environment to the inner pipe 10 of the pipe 4 will cause the liquid in the pipe 10 to evaporate.

This solution allows for long-term storage of liquid cryoproducts in the tank. Excluding the filling of the inner pipe 10 of the pipeline 4 with liquid cryogenic product from the inner vessel 1. This is achieved by installing an additional shut-off valve 6 in the inner vessel 1 at the inlet of the pipe 10. to be safe

ti, be reliable in work, easy to manufacture and operate. The pneumatic actuator made in the form of bellows meets these requirements. Gas should be used as a control gas, with a condensation temperature below the temperature of the liquid cryoproduct stored in vessel 1 (for example, helium for hydrogen and all other cryoproducts). In addition, the invention makes it possible to remove the liquid cryogenic product from the inner tube 10 into the inner vessel 1. This is achieved by connecting the tube 1Q to the vessel 1 with a heat-insulated tube 7 with a gas shutter 8 placed in the heat-insulating cavity of the tank, and the tube 7 is removed from the lower point of the pipe 10. As a result, heat from the environment to the internal pipe 10, the liquid cryoproduct in it will evaporate, the resulting pressure in the pipe 10 will squeeze the liquid into the vessel 1 from the internal pipe 10. 8 of the tube 7 will not allow liquids from the vessel 1 to enter the inner tube 10. In addition, the supply of heat to the liquid cryoproduct, which is in the inner vessel 1 of the tank through the valve valve 16 (see Fig. 2) from being in the inner pipe 10 (see Fig. 1) of warm gas, as well as heat supply from the warm internal pipe 10 to the walls of the seat 14 (see Fig. 2) of the valve. This is achieved in that the valve plate 16 is provided with a heat insulating gasket 18, and the seat 14 is connected to the inner pipe 10 (see Fig. 1) with a heat insulating element 15 (see Fig. 2).

The elimination of the liquid cryoproduct from the inner vessel 1 (see Fig. 1) into the inner pipe 10 of the pipe 4 is most easily achieved by installing the inside of the vessel 1 at the inlet to the pipe 10 of the valve with a pneumatic actuator in the form of sylph.

Installing a valve inside a vessel with a different actuator (nakrchker, electromagnetic) will lead to a significant complication of the actuator, will decrease by 5

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reliability, special measures will be required to ensure its safe operation, as well as other issues.

When installing the valve actuator under the tank, the reliability of the tank will decrease dramatically, as it is necessary

0 will install the bellows on the inner pipe 10 and the outer pipe 11 of the pipeline 4. The reliability of the bellows is lower than the reliability of the pipe. In the event of a rupture of the bellows, it will be necessary to urgently evacuate the liquid cryogenic product from the reservoir.

Installing a valve actuator above the reservoir will also lead to a significant complication of the actuator.

o Reducing the loss of liquid cryoproduct stored in the tank is suggested to be achieved not by improving the thermal insulation of the bottom discharge pipeline, but by eliminating the evaporation of liquid in the bottom discharge pipeline and by reducing the supply of liquid from the warm gas in the bottom pipe to the liquid plum.

Claims (1)

Invention Formula A cryogenic tank containing, a casing and a heat-insulated inner vessel with a lower pipeline 5 a drain valve with a shut-off valve installed in it, characterized in that, in order to reduce the cryoproduct loss, it is equipped with an additional shut-off valve with pneumatic actuator. The house is installed in front of the main inside the vessel at the inlet to the lower drain pipe, and the valve plate is equipped with a heat insulating gasket. the seat is made in the form of a glass connected to the pipeline through a non-heat-conducting element, the cavities of the glass and the pipeline communicate with each other, the pneumatic actuator is made in the form of a bellows, one end of which is rigid connected to the bottom of the vessel through the rack, and the other is tightly attached to the valve stem, while the pipeline section between the valves is communicated n 5 Uze 1 with the vessel by means of a heat-insulated tube equipped with a water seal placed in the thermal insulation of the vessel. celaktor 0 "arrogant Compiled by G. Olshanska Tehred L.Oliynyk. Corrector V.Girn to Order 968 Circulation 417 ZNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Rauyska nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, ul. Gagarin, 101 D / e.2 Subscription