Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1997-05-23
1999-08-24
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62619, F25J 100
Patent
active
059410957
ABSTRACT:
A process for the compression of helium at low temperature and low pressure, and a compression line and refrigeration unit corresponding thereto. A plurality of centrifugal compressors (C.sub.1 to C.sub.4) in series are so dimensioned as to supply nominal compression loads .tau..sub.1N, . . . .tau..sub.nN for same nominal mass flow rate D.sub.N. A (n+1)th centrifugal compressor (C.sub.5) is dimensioned for a nominal compression load substantially equal to .tau..sub.1N for a decreased mass flow rate D.sub.D is less than D.sub.N of the precompressed gas at a pressure P.sub.0 multiplied by .tau..sub.2N .times. . . . .times..tau..sub.nN. This extra compressor is placed in series upstream of the n centrifugal compressors. The (n+1)th compressor is adjusted such that the compressors of rows 2 to n ensure substantially constant compression loads that are equal respectively to .tau..sub.2N, . . . , .tau..sub.nN, and the compressors of rows 1 and (n+1) ensure compression loads .tau..sub.1 and .tau..sub.n+ such that substantially .tau..sub.1 .times..tau..sub.n+1 =.tau..sub.1N. The foreseen use is for the refrigeration of elements of superconductors.
REFERENCES:
patent: 3416324 (1968-12-01), Swearingen
patent: 3954430 (1976-05-01), Curtis et al.
patent: 4566885 (1986-01-01), Haak
patent: 4758257 (1988-07-01), Gates et al.
Capossela Ronald C.
L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation de
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