Capacity for gas storage

 

The reservoir is used for storage of gases mainly on vehicles, such as hydrogen storage on Board the vehicle with the power plant on the basis of the electrochemical generator. Capacity for gas storage comprises a sealed casing, the inner vessel, a pipe for filling and emptying with a shut-off valve, pipe gazebos with a shut-off valve at the tank around the inner vessel of the screen with the pipeline, in the upper part of the inner vessel and screen holes, informing them of the cavity with the cavity of the sealed casing, in addition, one end of the pipeline screen is connected to the pipe gazebos, and the other end is inserted into the cavity of the inner vessel, and the ratio of the volume of the inner vessel VBto the volume of the pressure-tight casing VHdetermine the value

where P is the gas pressure in the tank when storing, PA;

the density of filled in the inner vessel of liquid gas, kg/m3;

R is the gas filled gas constant, j/(kgK);

T - temperature of gas in the tank during storage, To,

and mass MCnutrend gas to the cooling down of the inner vessel, kg;

r is the heat of vaporization of the gas, j/kg;

WithPthe heat capacity of the material of the inner vessel, j/(kgK);

T0- the initial temperature of the inner vessel, To;

TW- temperature charged liquid gas, K.

The technical result - the reduction of the time of refueling, the gas losses. 1 Il.

The invention relates to the storage of gases in containers mainly on vehicles, such as storing hydrogen on Board a vehicle with a power plant on the basis of the electrochemical generator.

Known decision for a similar device for storing gas at high pressure (see the Translation from English. Ed. by D. H. Brotman. Manned spacecraft. - M.: Mashinostroenie, 1968, page 317, Fig. 23.1), containing the capacity for gas storage and pipe the filling-emptying with a shut-off valve.

The disadvantage of analogue is that during storage of gas in the tank at high pressure there is a problem fast fill capacity, which is especially important in transport, where it is associated with prolonged inactivity of the vehicle when refueling. The gas flow when charging is limited by the heat capacity semoga gas.

Also known capacity for gas storage, selected as a prototype (see A. M. Arkharov, and other Cryogenic systems. - M.: Mashinostroenie, 1987, page 500, Fig. 7.11), for gas storage in the liquid state. The container comprises an outer casing, an inner vessel with a pipe filling-emptying containing shut-off valve and pipe gazebos with a shut-off valve. The space between the outer casing and the inner vessel vacuumized and filled with insulation.

The disadvantage of the prototype is time limited gas storage due to evaporation during storage. In large containers, storage losses exceed 0.5% per day and increase with decreasing dimensions of the container. The discharge of gas from the container during storage requires the use of special means for its disposal to ensure safe storage, such as a tap outside the premises in which the capacity, or afterburning. These drawbacks make the use of such containers, for example in vehicles, complicated and inconvenient.

The present invention is to reduce the time of filling the tank, ensure the long time storage of gas and excluding loss of gas from the container during storage.Bto the volume of the pressure-tight casing VHdetermine the value for

where P is the gas pressure in the tank when storing, PA;

the density of filled in the inner vessel of liquid gas, kg/m3;

R is the gas filled gas constant, j/(kgK);

T - temperature of gas in the tank during storage, To,

the mass MS of the inner vessel is determined by the ratio of

where MV is the gas flow rate at cooling down the inner vessel, kg;

r is the heat of vaporization of the gas, j/kg;

Withpthe heat capacity of the material of the inner vessel, j/(kgK);

T0- the initial temperature of the inner vessel, To;

TW- temperature charged liquid gas, K.

The drawing shows a General view of the storage tanks for gas the internal vessel 2 has a screen with 4 pipeline 5 and the opening 6 in its upper part. The tank also contains a tube of the filling-emptying 7 with a shut-off valve 8, pipe gazebos 9 with a shut-off valve 10 and the temperature sensor 11. The inner vessel 2 and the screen 4 is installed in the hermetic casing 1 by means of bearings 12. Pipeline 5 screen 4 at one end 13 is introduced into the cavity of the inner vessel 2 and the other end 14 is connected to the pipe gazebos 9. The aperture 3 of the inner vessel 2 and the opening 6 of the screen 4 report of the cavity of the inner vessel 2 and the screen 4 with the cavity of the sealed casing 1.

Capacity works as follows. When you open the shut-off valve 10 in the pipe gazebos 9 open the shutoff valve 8 on the tube-filling-emptying 7 and produce filling the inner vessel 2 liquid gas such as hydrogen. In the process of completing a portion of the liquid gas is evaporated due to the cooling of the inner vessel 2. The evaporated gas through the opening 3 in the inner vessel 2 and the opening 6 in the screen 4 fills the cavity of the casing 1, and simultaneously enters the pipe 5 screen 4 through the end 13 and then through the end 14 of the pipe 5 enters the pipe gazebos 9. Passing through the pipeline 5 screen 4, the evaporated gas cools screen 4 and thereby reduces heat flow from the pressure-tight casing 1 to the DNAs is Nivat when the liquid gas in the pipeline 5 screen 4, that is fixed by the temperature sensor 11 to jump the pipe temperature of gazebos 9. With the completion of the filling of the inner vessel 2 at the same time close the valves 8 and 10. Due to heat leakage into the vessel from the environment, liquid gas located in the inner vessel 2, evaporates, passes into the gaseous state and the pressure in the vessel increases. The growth pressure is discontinued when the temperature of the gas in the tank will be equal to the ambient temperature.

When a known volume of the sealed casing 1 VH, pressure P and temperature T of gas in the tank when storing the mass of gas in the tank is determined from the relation

where R is the gas constant gas filled.

The volume of the inner vessel 2 VBdetermined by the relation

wherethe density of filled liquid gas.

From the relations (1) and (2) is the ratio of the volume of the inner vessel 2 and the pressure-tight casing 1

The capacity for storing hydrogen at a pressure of 40 MPa and a temperature of 300 K, which is filled with liquid hydrogen with a density of 65 kg/m3must have VB/VH=0,49. So obrabotanniy vessel volume 49 l and the weight of the filled hydrogen is expected to be 3.2 kg

The filling capacity is determined by the flow rate of supplied liquid gas. When filling these 3.2 kg of hydrogen for 1 min the pressure drop on the tube-filling-emptying 7 5 m length and 20 mm in diameter will be1 kPa, and the maximum pressure drop in the pipeline 5 screen 4 length of 10 m and a diameter of 25 mm will be100 kPa. The provision of the specified parameters of the vessel does not present technical difficulties.

The mass of gas discharged through the pipe gazebos 9 when filling capacity is determined by the gas flow on the cooling down of the inner vessel 2, the heat leakage into the inner vessel 2 from the hermetic casing 1 and the filling capacity. The gas consumption for cooling down the inner vessel 2 MInthe weight of the inner vessel 2 MWiththe heat capacity of the material of the inner vessel 2Pand the heat of vaporization of the liquid gas r connected by the relation

MCCP(T0-TW)=MInr,

where T0the temperature of the inner vessel 2 before filling gas;

TW- the temperature of the liquid gas.

So, to reduce the consumption of liquid gas Sahelian flow rate of 0.25 kg of hydrogen for cooling down the inner vessel 2, made of steel HAG having a heat capacity of 450 j/(kgK), the weight of the inner vessel 2 will be 1 kg wall Thickness of the inner vessel 2 to 3.2 kg of liquid hydrogen will be0,15 mm, This thickness is enough, because the inner vessel 2 is experiencing a minor mechanical load in the process of filling the tank, and after evaporation of the gas it is loaded only by its own weight.

Evaporated and discharged from the tank during the filling gas can be collected in a special container and again Origen or used in a gaseous state.

Thus, the set of new features that are absent in the known technical solutions, enables a new technical result is to reduce the time of reservoir filling and to prevent loss of gas from the container during storage.

Claims

Capacity for gas storage, comprising a sealed casing, the inner vessel, a pipe for filling and emptying with a shut-off valve, pipe gazebos with a shut-off valve, characterized in that capacity installed around the inner vessel of the screen with the pipeline, in the upper part of the inner vessel and screen holes, reported the nd gazebos, and the other end is inserted into the cavity of the inner vessel, and the ratio of the volume of the inner vessel VBto the volume of the pressure-tight casing VHdetermine the value for

where P is the gas pressure in the tank when storing, PA;

the density of filled in the inner vessel of liquid gas, kg/m3;

R is the gas filled gas constant, j/(kgK);

T - temperature of gas in the tank during storage, To,

and mass MCthe inner vessel is determined by the ratio of

where MB- gas consumption for cooling down the inner vessel, kg;

r is the heat of vaporization of the gas, j/kg;

WithPthe heat capacity of the material of the inner vessel, j/(kgK);

T0- the initial temperature of the inner vessel, To;

TW- temperature charged liquid gas, K.

 

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