SU744186A1 - Method of filling containers with compressed gas - Google Patents

Description

(54) METHOD FOR FILLING A VESSEL WITH COMPRESSED GAS

I

The invention relates to the technology of filling vessels with compressed gases and can be used in those technical fields where it is necessary to fill vessels, mainly medium and large capacity, with compressed gas (compressible liquid), especially at medium and high pressures.

There are known methods for filling vessels with compressed gases by injecting a gas of initial temperature through the inlet pipe into the vessel until the final pressure is obtained, after which the flow of gas into the vessel is stopped 1.

Since the pressure in the vessel is compressed under conditions of insufficient heat dissipation through the vessel walls, the average final temperature of the gas in the vessel rises above the initial temperature of the supplied gas, and therefore the gas parameters in the vessel deviate from the nominal values.

In order to inject a gas into the vessel, when the initial temperature is close to the ambient temperature, the filling of the large-capacity vessel is carried out in several stages, stopping the supply

gas upon reaching the limiting pressure and / or temperature, and waiting in the intervals until the gas is cooled and its pressure decreases. Known method of filling: pre-cooling supplied to the vessel

5 gas in a low-temperature refrigeration unit, through which, by lowering the initial temperature of the gas, it is possible to proportionally reduce the average final temperature of the gas in the sabtuda:

Closest to the proposed method.

10, the essence of which is to supply compressed gas to a vessel to obtain a predetermined pressure and then cool the gas and the vessel, and by throttling the compressed gas and directing it to blow the filled vessel outside to accelerate the cooling of the heated gas in vessel 2.

However, external cooling of the vessel does not solve the problem of rapid cooling of the gas in the vessel due to the small heat transfer coefficient inside the vessel and is not at all suitable.

20 for vessels covered with thermal insulation on the outside.

The purpose of the invention is to reduce the energy consumption for cooling.

fcife. ..jSLGS-J-s .; This goal is achieved by introducing a new process of isobaric displacement of compressed heated gas from a vessel through an outlet by supplying a compressed gas to an initial temperature through an inlet at a constant pressure of gas in the vessel, i.e. without compressing the gas. As a result, the heated gas is replaced by the feed gas, and the average gas temperature in the vessel rises to the initial temperature. In addition, it is suggested that the displaced gas be cooled to a constant pressure and returned to the vessel. At the most disadvantageous case of complete mixing of the gas in the vessel, the heated gas diluted with the initial temperature gas is displaced from it, and after changing the gas volume in the vessel, the difference between the average gas temperature in the vessel and the initial temperature decreases (for example, after a threefold change of gas in the vessel gas decreases 8 times). It is known from the experiments that when gas is supplied to the lower part of the vessel, the portions of gas that undergo the greatest compression and have the highest temperature remain in the upper zones, as a result of which significant temperature differences occur and persist in the gas for a long time. Therefore, in order to reduce the required exchange rate to 1.5–2, gas should be supplied to the lower part of the vessel at a low speed, and the released gas should be taken from above from the elevated temperature zone. In the simplest applications, the heated gas discharged from the vessel is simply throttled into the atmosphere or into a gas holder. It is energetically advantageous, without reducing the pressure of the compressed gas displaced from the vessel, to cool it in the heat exchanger to the initial temperature and return it to the vessel using a circulation pump compensating only hydraulic TtOTepTi. It is advisable to start such circulation with cooling with the appearance of heating pipes in the vessel at a pressure lower than the final one and continue simultaneously with the flow of the pelvis into the vessel, the wire of the isobar displacement and cooling with a slowly growing pressure in the vessel. Instead of a specially installed heat exchanger and a circulating pump for cooling the gas displaced from a vessel, it is sometimes wise to use the end cooler and the last stage of the filling compressor unit to force the gas into the vessel from the penultimate stage with an initial temperature close to the ambient temperature. FIG. Figure 1 shows a filling scheme with an independent heat exchanger and a circulation pump; in fig. 2 - scheme on., Ё «igga« nd in «4;.) 744186

Claims (1)

4 circuits with circulation and cooling in the last stage of the compressor unit. In the filled vessel I with the inlet pipe 2 and the outlet pipe 3, which is closed by valve (or valve) 4, compressed gas of the initial temperature is fed through the filling pipe 5. After the predetermined pressure in the vessel has been reached, the operation of the isobaric displacement of the heated gas from the vessel is started: valve 4 is opened and the gas is started to be released from the vessel in such an amount that, with continued flow of gas through pipe 2, the gas pressure in the vessel does not decrease. In the simplest version, the heated gas from the vessel is throttled with a valve 6 into the atmosphere or into a gasholder with the required mass of compressed gas supplied via pipeline 5. It is energetically more favorable, without reducing the pressure of the displaced gas, to cool it in the heat exchanger 7 with refrigerant 8 to the initial temperature and the circulation pump 9 return the gas to the vessel 1. When the initial gas temperature is close to the ambient temperature, end cooler 10 is used to circulate and cool (water) the heated gas that is displaced from the vessel through the valve the last stage 11 of the compressor unit, if, having closed the valve 12 and the valve 13 is open, supply compressed gas to the vessel through receiver 14 from the penultimate stage 15 to the maximum permissible pressure in it. When at this pressure all the gas in the vessel has an initial temperature, a further increase in pressure with a degree; the compression of the last stage, if required, leads only to a small increase in temperature in the vessel. If the circulation with cooling is continued even after reaching the limiting pressure in the vessel, the subsequent supply of compressed through line 5 compensates for only an increase in the mass of gas in the vessel due to a decrease in its temperature. According to the scheme shown in FIG. 2, the goal is achieved without additional equipment and with energy losses only for gas circulation. Claim 1. Method of filling a vessel with compressed gas, including supplying a compressed gas of initial temperature to the vessel and subsequent cooling of the heated compressed gas, characterized in that, in order to reduce the energy consumption for cooling, the gas is cooled by isobar displacement of the heated compressed gas initial temperature.