Process and apparatus for liquefying low boiling gas such as nit

Details Process and apparatus for liquefying low boiling gas such as nit Process and apparatus for liquefying low boiling gas such as nit

1997-03-05

1998-09-08

Kilner, Christopher

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62912, F25J 300

Patent

active

058028749

ABSTRACT:
A process and apparatus are used for liquefying a low-boiling gas, 1, 507, particularly nitrogen. Gas to be liquified is cooled 12 under an increased pressure, is expanded 14 and is then obtained as a liquid product 16. In a refrigeration cycle, cycle medium is compressed to a first pressure 4, 6, 8, 10. A first partial flow 101 of the cycle medium is expanded while carrying out work in a first expansion machine 102. A second partial flow 201 of the cycle medium is cooled 12a and is expanded while carrying out work in a second expansion machine 202. In addition, a third partial flow 301 of the cycle medium is cooled and is expanded in a third expansion machine 302 while carrying out work. All three expansion machines 102, 202, 302 have essentially the same inlet pressure. The cooling of the gas to be liquified is carried out at least partially by the indirect heat exchange with expanded cycle medium 103, 203, 17 in a cycle heat exchanger 12. The outlet pressures of the three expansion machines 102, 202, 302 are essentially the same.

REFERENCES:
patent: 2496380 (1950-02-01), Crawford
patent: 3194025 (1965-07-01), Grossmann
patent: 3285028 (1966-11-01), Newton
patent: 3677019 (1972-07-01), Olszewski
patent: 4894076 (1990-01-01), Dobracki et al.
European Search Report Aug. 26, 96.

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