DE444314C - Method and device for cooling down and liquefying gas mixtures - Google Patents

Description

Method and device for cooling down and liquefying Gas mixtures. When cooling down gases with the help of the = Joule-Kelvin effect and countercurrent effect, better economy is achieved if the highly compressed gases only partially relaxed and with the larger fraction works in a cycle. Should the liquefaction be used to separate gas mixtures lead, this procedure is not readily applicable since the processed The gas mixture must always be replaced by a completely new one. One has to do this in Tried to help in this way that one with a special cooling gas in the closed Circulating current works. However, this makes a special compressor for the one to be separated Gas mixture required and the system cumbersome.

On the other hand, in air liquefaction and separation systems, a Trying to achieve greater economy by relaxing of the gases wholly or partially with simultaneous work performance in piston engines or let turbines go by. In this case, these machines get - like the nozzles - from the coldest end of the countercurrent both the gas supply, and puff it out there in order to achieve the lowest possible temperature. Temperature drop, However, cooling and power output decrease in the same way as the temperature drops strong. In addition, the radiation losses are all the greater and destroy the more of the actual cooling capacity, the deeper it is The temperature below which the machine is being used drops. Also purely mechanically particularly low temperatures make the continuous operation of such machines very difficult.

Uni these evils of the two ways of working described above remedial action is left with the procedure according to the invention that high compressed gas mixture first in a nozzle, which is at the coldest end of the countercurrent is arranged to expand partially. The predominant, non-liquefied part is then returned in countercurrent to the gas to be cooled, and afterwards it has already warmed up to a greater or lesser extent in an expansion machine Further relaxed while performing external work. That cooled down again Gas mixture is repeated at a suitable point - not on the coldest part Removal of heat in the countercurrent and parallel to that coming from the nozzle Gases returned. -With this working method, the expansion machine is used under Worked at a much higher temperature, so that cooling capacity and power recovery stay high while avoiding mechanical difficulties.

The process is therefore extremely cheap, and so is the economy remains, regardless of whether it is just a liquefaction or above is also a decomposition of the gas mixture.

The drawing shows an embodiment of this purely schematically new procedure.

In it, a is the high pressure pipeline leading through the countercurrent. The highly compressed that cooled in this line on its way through the countercurrent Gas is injected into the externally adjustable nozzle b up to a desired medium pressure relaxed and partially liquefied after reaching sufficiently low temperatures. The predominant amount that has remained in gaseous form flows through pipe c from the coldest Part of the countercurrent to through it back, whereby they enveloped by it, under high pressure. stagnant gas in a removes heat and thereby regains its temperature elevated. The gas then leaves the countercurrent through the pipeline d to after the Cold air machine e to get to where it continues to expand, work on the pistons and the crankshaft releases, in order to then puff out again into the countercurrent through the nozzle f. There it flows through the line g parallel to the mixture in c and against it High pressure gas in a, finally after complete heat exchange the apparatus at b - to leave. Of course, the individual tubes can flow in countercurrent can be arranged in any way, if only in principle the described heat exchange correspond. - In the drawing, a second nozzle i is arranged with the the liquid formed behind the first nozzle can be expanded further. the The very cold vapors that are formed in the process are also passed through the pipe h recycled in countercurrent to cool the highly compressed air to then to unite with the engine exhaust in g. Instead of the nozzles, it goes without saying a gas separator of known construction can be arranged. The gas separation must, however then take place under an overpressure compared to the engine exhaust. Also is under Circumstances when gas mixtures of two proportions of approximately the same percentage Composition should be separated, the placement and arrangement of two in parallel held expansion machines required, as in this case when using only one machine, that is, if only one part is performing external work is relaxed, too much of the achievable cooling capacity is lost. With unequal However, one will usually only use one machine in the size of the proportions that the predominant part of the gas mixture with the performance of external work completely is expanded. The separated smaller portion becomes, similar to the steam in line h, take advantage of its capacity in countercurrent.

Claims (2)

PATENT CLAIMS: i. Process for cooling down and liquefying of gas mixtures, characterized in that the compressed gases are initially in a nozzle, which is arranged at the coldest end of the countercurrent, is partially relaxed that they then convert the heat, which is converted into internal work, in countercurrent resume from the compressed gases to then more or less heated in a cold air machine to fully expand under the power of external work and to flow back into the countercurrent at a suitable point for further heat extraction. 2. Device for cooling down and liquefying gas mixtures according to claim i, characterized in that in the event that the gas mixture is separated into its Main components two expansion machines connected in parallel are used.