SU1456685A1 - Method and apparatus for storing cryogenic liquid in reservoir - Google Patents

Abstract

The invention relates to cryogenic technology and allows creating safe conditions during container transportation. The method includes filling the tank with cryo-liquid, evacuating the gases formed and creating a gas podzntpki liquid under an overpressure above the mirror, the overpressure being kept constant, and the difference between the static and dynamic pressure in the exhaust gas stream should be greater than or equal to the atmospheric pressure. A device for carrying out the method comprises a container with a casing and a pipeline for supplying liquid and venting gas with valves, as well as a shut-off and regulating body mounted behind the valve on the pipe of the gas outlet pipe and made in the form of a check valve or restriction device. This technical solution makes it possible to eliminate the ingress of atmospheric air into the container and contamination of the cryo-intake capacity. 2 sec. and 1 z. p. f-ly, 1 ill. with (L

Description

 t.

The invention relates to chemical and petroleum engineering, primarily cryogenic, and can be used in the delivery of liquids to a consumer in vehicles.

It was established experimentally that, due to the dynamic processes occurring in the tank during the transport period, the product is contaminated, and the amount of contamination is proportional to the transport distance. Transportation of liquids with a closed gas outlet line in the indicated containers does not satisfy the security conditions for the operating personnel.

The purpose of the invention is to increase safety when transporting the container.

The drawing schematically shows a device for implementing the proposed method.

On the vehicle 1 placed capacity 2 with a casing 3, between which is located the evaporator 4, pipelines 5 and 6 of the fluid supply and exhaust gases, respectively. On the pipe 6 is placed a valve 7, a shut-off and regulating body 8 and a pipe 9, located behind the casing 3. The container 2 is equipped with a pressure gauge 10 that is discharged to the outside. On the vehicle 1, an extraneous source of gas, a closed outlet and a source of gas (not shown) may also be placed outside the casing 3.

The method is implemented as follows.

Liquid oxygen through line 5 is charged into tank 2 with casing 3 mounted on vehicle 1. In this case, line 6 is opened by valve 7. After refueling, a pipe 9 is installed with a stop-regulating body 8. By evaporating the liquid in the tank 2 or in the evaporator 4 above the liquid, a gas cushion is created under excessive pressure, which is kept constant throughout the entire transportation route, choosing from the conditions under which the difference between the statistical and dynamic pressures in line 6 are greater than or equal to atmospheric pressure. The pressure (for example, 0.15-0.2 atm) is controlled by a pressure gauge 10 and is supported from an external source, made, for example, in a heat exchanger, which is connected in parallel with the evaporator 4.

The creation of a gas cushion in a container above the fluid liquid under pressure, which is maintained at the same level throughout the transportation route (the pressure level is chosen from the conditions under which the difference between static and dynamic pressures in the gas exhaust line during transport is greater than or equal to atmospheric pressure), ensures gas flow from the tank, which prevents atmospheric air from entering the latter, including during acceleration and deceleration of the vehicle and other oscillations of the liquid mirror, and also eliminates the pressure increase in the tank above the allowable. .

Additional equipment of the device with a shut-off regulator, which is located on the gas exhaust pipeline in series with the valve, ensures that the pressure in the gas cushion is maintained at a predetermined level, eliminating its involuntary povyshenie, while not requiring maintenance personnel constant adjustment during transportation.

Maintaining an overpressure of the gas cushion at 0.15

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0.2 atm satisfies the safety requirements and at the same time completely eliminates the ingress of atmospheric air into the tank, which has been confirmed experimentally for tanks, used for centralized delivery in urban conditions, when dynamic oscillations (constant

10 stops and moving of the vehicle, etc.) and the air pollution is especially great.

Creating a gas cushion by supplying a gaseous product to a container

15 ipi simultaneously with its filling with liquid, prevents the ingress of atmospheric air and ensures the removal of residual contaminants from the tank.

20 Creating a gas cushion by supplying the gaseous product to the container after it is filled with liquid, when the refilling is pre-cut. lines along with the exception of hit

25 atmospheric air into the product, prevent involuntary displacement of the product.

Use as a gaseous product gas, which is obtained

30 by evaporating the transported liquid, the simplest way is to create a gas cushion in the tank. In addition, the use of gas from an extraneous carrier as a gaseous product reduces evaporation of the transported fluid and, consequently, its enrichment with impurities.

The installation of an extraneous source on the vehicle makes it possible to supply the gaseous product, both at the filling stage and along the entire transportation route.

The use of a neutral noncondensing gas as a gaseous product increases the level of transportation safety and does not lead to condensation of the gaseous product, which, in turn, reduces the pollution and evaporation of the liquid.

Maintaining the overpressure in the gas cushion by partially evaporating the fluid being transported continuously ensures gas flow

55 through the pipeline exhaust gases and eliminates the ingress of atmospheric air.

In this case, partial evaporation of the transported liquid, carried out in the tank, allows to ensure the specified flow rate, for example, by using heat influxes from the environment, which are formed at the delivery stage, and, consequently, reduce the evaporation of the suspension. Partial evaporation of the transported liquid, carried out in the evaporation of the shipment and the ingress of atmospheric into the spirit in the last During the transport period. A similar assignment is the removal of the nozzle removable, as well as the fact that the valve is integrated in the nozzle of the gas exhaust line. Placement of the locking and registration of the lending body under the shell excl.

le, provides an additional amount of its involuntary compression

and

the amount of gas to maintain an overpressure in the tank.

Maintaining overpressure in a gas cushion from an external source reduces evaporation of the liquid, 15 bots, checks and adjustments, its enrichment and increases safety. Compared with the basic object, transportation

The knowledge of the transported product.

The implementation of the valve is removable, providing the necessary measures for its safe operation.

thirty

Connecting the specified source to the fluid supply pipeline eliminates the passage of liquid oil and reduces the heat leakage to the latter.

Use as an extraneous source, such as a heat exchanger, ensures the controllability of the process of maintaining the excess pressure by changing the evaporation of the liquid. At the same time, the connection of the specified source in parallel with the evaporator allows to reduce heat inflows and liquid enrichment.

The implementation of the valve, for example, in the form of a restriction device allows the most simple to create and maintain a gas cushion in the tank.

Fixing the constricting device to the hinge allows eliminating the involuntary increase in pressure in the tank in case of high gas flow rates, for example, when filling the tank. The implementation of the valve, for example, in the form of a check valve, reduces the evaporation of the liquid and the gas flow through the lines.

Installing a valve on the casing prevents it from freezing and increases the safety level of the process. Equipping the gas removal line with a nozzle located on the casing allows for safe drainage of the gaseous product. The implementation of the nozzle with a closed outlet eliminates the increase in pressure in the tank during the period of the proposed method and device for its implementation allows you to completely eliminate the ingress of atmospheric air into the product, eliminate the need to clean the fluid after transportation and increase the level of safety of technological processes.

Claims (3)

1. A method of storing a cryo-liquid in e-bones, including filling it with liquid Cree, evacuating the gases that form and creating a gas cushion above the mirror under pressure, which is different. To increase safety when transporting the container, the pressure of the gas cushion is kept under 35 at the same time, the difference between static and dynamic pressures in the flow of exhaust gas or equal to atmospheric pressure .. 40 2. A device for storage of cryo-liquid, containing a container of homogenous skin and pipelines for supplying liquid and venting gas with valves, which is characterized in that, in order to increase safety during the transportation of the container, it is equipped with a shut-off and control organ installed behind the valve pipeline exhaust gas. 3. The device according to p. 2, about the shout, the fact that the valve is made in the form of a check valve or a restriction device. 50 straightening and exposure of atmospheric air to the last one during transportation. A similar purpose has the removal of the nozzle removable, as well as the fact that the valve is built into the nozzle of the gas exhaust line. Placement of the locking regulatory body under the skin prevents its involuntary compression. and care, checking and adjustment, Compared with the basic object The knowledge of the transported product. The implementation of the valve is removable, providing the necessary measures for its safe operation, 15 bots, checks and adjustments, Compared to the basic object thirty 20 25 The proposed method and device for its implementation completely eliminate the ingress of atmospheric air into the product, eliminate the need for cleaning the liquid after transportation, and increase the safety of technological processes. Formula from found and 1. A method of storing a cryo-liquid in a tank, including filling it with a cryo-liquid, evacuating the formed gases and creating a gas cushion above the mirror under pressurized fluid, characterized in that, in order to improve safety when transporting the tank, Keep constant, while the difference between the static and dynamic pressures in the flow of exhaust gas or equal to the atmospheric pressure .. 40 2. A device for storage of cryo-liquid, containing a container with a casing and pipelines for supplying liquid and evacuating gas with valves, characterized in that, in order to increase safety during transportation of the container, it is equipped with a valve that is installed behind the valve on the outlet pipe gas. 3. The device according to p. 2, about the shout, the fact that the valve is made in the form of a check valve or a restriction device. 0