Method and apparatus for liquefying a low-boiling gas

Details Method and apparatus for liquefying a low-boiling gas Method and apparatus for liquefying a low-boiling gas

1984-10-10

1986-08-19

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 38, 62 40, F25J 300

Patent

active

046067442

ABSTRACT:
The apparatus for liquefying helium gas comprises a pre-cooling stage and a cooling stage in which the high pressure gas from the pre-cooling stage is divided into at least two sub-flows. One sub-flow is expanded with the performance of work to a first intermediate pressure while a second sub-flow passes through a heat exchanger and is then expanded with the performance of work to a second intermediate pressure. The sub-flows may thereafter be separately passed through a further heat exchanger or combined for simultaneous passage through the heat exchanger prior to being further expanded and cooled in a throttle valve or turbine. The partially liquefied flows are then delivered to a tank from which the low-temperature return flow can be passed back through the cooling stage to the pre-cooling stage for re-cycling.

REFERENCES:
patent: 3098732 (1963-07-01), Dennis
patent: 3864926 (1975-02-01), Collins

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