SU1502895A1 - Tank for storing and transporting liquified gases - Google Patents

Abstract

The invention relates primarily to isothermal tanks for liquid low-temperature carbon dioxide under pressure. The purpose of the invention is to simplify the design, increase the reliability and safety of operation when operating under excessive pressure. The tank contains a heat insulated vessel with liquid and gas pipelines with valves 4, 5, a float gauge and a pipeline with safety devices. New in the tank is the presence in the upper part of the vessel of a rigid partition, hermetically fixed curvilinear part on the upper bottom of the vessel that does not reach its lower bottom and forms a closed compartment. In this case, the base of the partition 10 is placed at the height of the maximum permissible level of the liquid phase of the product with the minimum permissible operating temperature of the product. The volume of the compartment is equal to (or more) the volume of thermal expansion of the stored liquefied gas, which creates a guaranteed gas cushion in the upper part of the vessel and prevents the reservoir from overflowing. 3 il.

Description

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The invention relates to the re-storage of trasorption and storage of liquefied gas and can be used in isothermal tanks for transporting liquid low-temperature carbon dioxide under pressure.

One of the basic conditions for safe operation and reliable operation of liquefied gas tanks is to prevent them from overflowing and adhering to the established rate (degree) for filling vessels with liquefied gases.

The purpose of the invention is to simplify the design, increase the reliability and safety of operation of tanks for liquefied gases when operating under overpressure.

FIG. 1 shows an isothermal tank, a section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a scheme for filling an isothermal tank with a product from a liquefied low-temperature gas storage device.

The tank for storage and transportation of liquefied low-temperature gases contains a heat-insulated vessel 1 with liquid 2 and gas 3 pipelines with shut-off valves 4 and 5, heat insulation 6, float gauge 7 and pipeline 8 with safety device 9. In the upper part of vessel 1, A rigid segmental-like partition 10 is installed, hermetically fixed by a curvilinear part on the cylindrical part of the vessel 1, and the base of the partition 10 is placed at the height H of the maximum permissible level of the liquid phase of the product at mini cial product permissible operating temperature, forming a closed, the compartment, whose volume is greater than or equal to the thermal expansion Ob stored liquefied gas it.

The tank is connected by pipelines 11 to a storage tank 12 provided with a gas pipeline 13 with a valve 14, a liquid pipeline 15 with a valve 16. The storage tank 12 is installed on the supports 17, and the tank is installed on the chassis 18, the difference in the height of their installation being not less than 3, 5 m.

The tank works as follows.

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At the moment of filling the vessel 1 with liquefied low-temperature gas, the reservoir is connected to the accumulator 12 by pipelines 11 and the shut-off valves 4 on the gas pipeline 3 and the gas valve 14 of accumulator 12 are opened. Then the shut-off valve 5 on the liquid line 2 and the valve 16 on the accumulator 12 open. The liquid phase flows by gravity from the accumulator 12 into the vessel 1, displacing the gas phase from it. The degree of filling of the vessel 1 is controlled by the float level gage 7. When the permissible degree of filling with the product (the height of the liquid phase H) is reached, it is necessary to stop filling the vessel 1 by closing the liquid 5 and gas 4 fittings.

In order to prevent the vessel from completely overflowing 1 with the liquid phase of the product, a partition 10 is provided, which, together with the vapor-liquid interface, forms a closed compartment.

Since the vapors in the compartment are in phase equilibrium with the liquid under saturation pressure, they prevent the liquid level from rising in the compartment. An elastic gas cushion is formed.

Subsequently, due to heat influx through the heat insulating layer 6 in the mass of low-temperature liquid, its evaporation occurs and the pressure in the vessel 1 slowly increases, accompanied by thermal expansion of the liquid. As a result, there is an elastic compression of the vapors in the compartment and a rise in the level of the liquid phase. When the maximum working pressure in vessel 1 is reached, a safety device 9 opens in line B and the medium is released, followed by a decrease in pressure in vessel 1 to the set value.

The height of the segmented partition 10 is determined by the difference between the internal diameter of the vessel and the value of the regulated height H of the liquid level in the vessel (degree of filling).

The proposed tank design reduces the possibility of damage.

explosive vessels, i.e. increases reliability and safety of operation due to the fact that a guaranteed gas cushion is created, which serves as a moderator for the rate of pressure rise due to its high compressibility.

Claims (1)

Invention Formula A tank for transporting and storing liquefied gases, containing a heat-insulated vessel with liquid and gas pipelines with valves, while the vessel has a compartment in the upper part to prevent overflow of the tank, characterized in that, in order to simplify the design, increase reliability and safety of operation when working under overpressure, the compartment is formed installed in the upper part of the vessel and tightly fixed rigid partition, not reaching the lower part of the vessel, while the volume of the compartment is greater than or equal to the volume of thermal expansion of the stored liquefied gas. YU Phi2.2 do