SU787771A1 - Apparatus for discharging liquefied gas from low-pressure reservoirs - Google Patents

Description

(54) DEVICE FOR THE RELEASE OF LIQUEFIED GAS FROM LOW PRESSURE TANKS

one

The invention relates to the construction of tanks and will find application in the construction of storage facilities for cryogenic liquids.

A device for discharging liquefied gas is known, the discharge in which occurs under the action of an overpressure resulting from the evaporation of a cryogenic liquid inside the drainage tank 1.

However, the use of such a device is not possible when draining liquefied gas from tanks of large diameter, in which a slight increase in internal pressure causes critical stresses in the design of the tank. As a rule, such tanks are designed for an overpressure of almost zero.

The closest technical solution to this invention is a device for the release of liquefied gas, containing a drain and a receiving tank connected by a drain pipe to the valve, and a pressure source (gas under pressure exceeding the elasticity of saturated vapors) that is connected to the drain tank 2.

The disadvantages of this device are its impossibility to use it for tanks of low internal pressure, large 5 losses of liquefied gas when released into the atmosphere, the need to supply large quantities of compressed gases for overpressure, in the case of formation of vapor columns inside the discharge pipeline of the gaseous phase

10 of the technical solution will not be economically justified, since the costs of creating high pressure tanks, increasing the heat insulation of the discharge pipeline, and increasing the demand for compressed gas will increase significantly.

The purpose of the invention is to ensure reliability in operation while increasing the rate of release.

The goal is achieved by the fact that the drain tank 20 is provided with a high pressure tank installed inside it with a check valve, the tank being connected to the drain pipe and to the pressure source and connected to the inside of the drain tank through a check valve.

To simplify operation, by ensuring that the pressure source is fed during the release of the liquefied gas, the pressure source is connected to the receiving tank.

The drawing shows a diagram of the proposed device.

The device contains a drain tank 1, with a container 2 installed inside, the inner spaces of which are connected through a check valve 3, a receiving tank 4 connected to the drain tank by a drain pipe 5 and a pressure source 6 by a feed pipe 7, a pressure pipe 8 connecting the internal tank 2 with pressure source 6, valves 9–12, installed respectively on drain 5, make-up 7, pipeline 13, 13 pipelines and pressure pipeline 8, as well as safety valves 14–16.

The device operates as follows.

Before the start of the discharge, the drain tank 1 and the tank 2 are filled with liquefied gas, a working liquefied liquid is poured into the container of the pressure source 6 6) 1 1 1 1 1, similar to the one being drained. Then the valves 9-12 are set in the working position (the valves 9, 12 open, the valves 10, 11 close). Under the action of overpressure occurring in the closed volume of the container of pressure source 6, the liquefied gas from tank 2 begins to be forced into the receiving tank 4. After the tank 2 is empty, the valves 9, 12 are closed and the valve 11 opens, connecting the internal volume of tank 2 the atmosphere. In this case, the liquefied gas from the drain tank 1 begins to be poured through the check valve 3. After filling the inner tank 2, the valve 11 is closed and the valves 12, 9 are opened, and the gas release process is repeated as described. With repeated repetition of the liquefied gas siphoning process, cryogenic;, 1K () in the pressure source 6 can completely evaporate. To prevent this, after some period of time, water is fed from the receiving tank 4. At the same time, the valves 10-12 must be opened and the valve 9 closed.

The use of the proposed device ynponienne design, the absence of mechanical units, the reliability of all devices, small repair and maintenance costs, the readiness of the scheme to work at any time, regardless of the presence of extraneous energy sources, as well as the possibility of using different gases to overpress the liquid phase.

Claims (2)

1. A device for discharging liquefied gas from low-pressure tanks containing a drain and a receiving tank connected by a drainage pipe with a valve and a pressure source connected to the drain tank, in order to ensure reliability in operation and speed of discharge, the drain tank is equipped with a high-pressure tank installed inside it with a check valve, while its capacity is connected to the drain pipe and The pressure source and through a non-return valve are connected to the internal cavity of the drain tank. 2. The device according to claim 1, characterized in that, in order to simplify operation, by feeding the pressure source, The SOURCE of pressure is connected to a primary tank. Sources of information taken into account in the examination. 1. Rose-Ins A. Technique of low-temperature temperature experiment. M., “Peace, 1966, with. 29. 2. Preobrazhensky N. I. Liquefied hydrocarbon gases. L., “Nedra, 1975, p. 80