Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1998-06-30
1999-01-19
Kilner, Christopher B.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62648, 62903, 62910, 62 5, F25J 304
Patent
active
058602968
ABSTRACT:
A method and apparatus for separating air in which a compressed and purified air stream is cooled in a main heat exchanger. Thereafter, the compressed and purified air is separated in a distillation column system to produce product streams. The product streams warm within the main heat exchanger by indirectly exchanging heat with the compressed and purified air stream. One or more of the product streams is distributed to a plurality of vortex tubes at successively warmer temperatures so that warm and cold streams produced thereby become successively warmer and one or more of the warm streams has a temperature warmer than that of said compressed and purified air stream upon its introduction into said main heat exchanger. All but the warm stream(s) having the warmer temperature are recycled back to said main heat exchanger to participate in the indirect heat exchange and heat is rejected by discharging said warm stream(s) so that heat is rejected at the warmer temperature and refrigeration is produced.
REFERENCES:
patent: 3775988 (1973-12-01), Fekete
patent: 4531371 (1985-07-01), Voronin et al.
patent: 5305610 (1994-04-01), Bennett et al.
patent: 5540058 (1996-07-01), Yi et al.
Kilner Christopher B.
Pace Salvatore P.
Rosenblum David M.
The BOC Group Inc.
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