Title:
MAIN HEAT EXCHANGE SYSTEM AND METHOD FOR REBOILING
Document Type and Number:
WIPO Patent Application WO/2015/094428
Kind Code:
A3
Abstract:
A method and main heat exchange system for use in a cryogenic air separation plant in which down-flow and thermosiphon heat exchangers are employed to partially vaporize an oxygen-rich liquid produced in a lower pressure column and to condense the nitrogen-rich vapor in a higher pressure column. A greater proportion of the oxygen-rich liquid can be partially vaporized in the down-flow heat exchangers than in the thermosiphon heat exchangers and the nitrogen-rich vapor condensed in the thermosiphon heat exchangers can have a higher oxygen content than the nitrogen-rich vapor condensed in the down-flow heat exchangers. This allows the higher pressure column to operate at a lower pressure than would otherwise be possible. A central conduit can extend from the higher pressure column into the lower pressure column to introduce the nitrogen-rich vapor into at least the down-flow heat exchangers for purposes of reducing pressure drop and column height.
Inventors:
CHAKRAVARTHY VIJAYARAGHAVAN S (US)
LOCKETT MICHAEL J (US)
BONAQUIST DANTE P (US)
SHELAT MAULIK R (US)
KIBLER KARL K (US)
LOCKETT MICHAEL J (US)
BONAQUIST DANTE P (US)
SHELAT MAULIK R (US)
KIBLER KARL K (US)
Application Number:
PCT/US2014/052101
Publication Date:
September 03, 2015
Filing Date:
August 21, 2014
Export Citation:
Assignee:
PRAXAIR TECHNOLOGY INC (US)
International Classes:
F25J3/04; F25J5/00
Domestic Patent References:
| WO1999039143A1 | 1999-08-05 |
Foreign References:
| US5071458A | 1991-12-10 | |||
| US5392609A | 1995-02-28 | |||
| US4372765A | 1983-02-08 | |||
| US5956972A | 1999-09-28 | |||
| JP2006266532A | 2006-10-05 | |||
| DE1949609A1 | 1971-04-08 | |||
| US5699671A | 1997-12-23 | |||
| US20090084133A1 | 2009-04-02 | |||
| FR2853723A1 | 2004-10-15 |
Other References:
TAMMAMI: "how to select the best reboiler for your processing operation", HYDROCARBON PROCESSING, GULF PUBLISHING CO. HOUSTON, US, no. 3, 1 January 2008 (2008-01-01), pages 91 - 94, XP001538370, ISSN: 0018-8190
Attorney, Agent or Firm:
HAMPSCH, Robert, J. et al. (Inc.39 Old Ridgebury Roa, Danbury CT, US)
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