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1. WO1979001167 - CRYOGENIC APPARATUS AND METHOD OF REMOVING FREEZING IMPURITIES FROM A CRYOGENIC FLUID

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[ EN ]

Claims

1. A cryogenic apparatus, comprising, in combination:
a. a feed stream of cryogenic
fluid to be cooled in said apparatus;
b. a make-up stream of
cryogenic fluid containing an elevated level of at least one
contaminant with respect to said
feed stream;
c. mixing means for combining the feed and make-up
streams into a combined stream
of cryogenic fluid;
d. means for passing said
combined stream of cryogenic
fluid through a heat exchanger
wherein it is cooled to a
temperature below the freezing
point of said contaminant;
e. adsorber means for
reducing the level of said
contaminant; and,
f. means for directing
said make-up stream through the
adsorber means prior to directing
it to said mixing means.

2. A cryogenic apparatus of Claim 1 wherein said feed stream and said make-up stream comprise feed and make-up streams of gaseous helium, respectively.

3. A cryogenic apparatus of Claim 2 additionally
including means to liquify gaseous helium.

4. A cryogenic apparatus of Claim 3 additionally
including means for withdrawing liquified helium.

5. A cryogenic apparatus of Claim 4 wherein said
adsorber means comprises a charcoal adsorber.

6. A cryogenic apparatus of Claim 5 wherein said means for liquifying helium comprises means to
expand high pressure gaseous helium to liquify it.

7. A cryogenic apparatus of Claim 6 wherein said means for expanding comprises a Joule-Thompson valve.

8. A cryogenic apparatus of Claim 6 wherein said means for expanding comprises an expander.

9. In a refrigeration cycle wherein a feed stream
of a gaseous fluid is cooled to a cryogenic
temperature to liquify said fluid, liquified
fluid is withdrawn from said cycle, an externally added make-up stream of gaseous fluid
having an elevated level of at least one contaminant with respect to the level in said feed stream is combined with said feed stream to replace withdrawn liquified fluid, and said combined stream is cooled to a temperature below
the freezing point of said contaminant:

The improvement of passing said
externally added make-up stream
through an adsorber containing
an adsorbent for said contaminant
prior to combining said externally
added make-up stream with said
feed stream whereby the level of
said contaminant is significantly
reduced in said combined stream of
cryogenic fluid and thereafter
passing said combined stream through
a heat exchanger wherein it is cooled
to a temperature below the freezing
point of said contaminant.

10. The improvement of Claim 9 wherein said gaseous fluid comprises helium.