US3593534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for heat exchange between gas streams
Assignee: Linde GmbH
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Filing: 1969-05-20
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Granted: 1971-07-20
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Expires: 1989-05-20
Abstract
Abstract A system for the heat exchange of low-temperatue gas mixtures, e.g. for the separation of gases in an air rectification installation or the like, in which part of the cold is obtained by expansion of a warm fraction of the gas mixture to be rectified or from a portion of the rectification products. The heat exchanger system is subdivided into regenerators and recuperators which are interchangeable in function at least in part. The recuperator system is subdivided into a relatively cold recuperator branch and a relatively warm recuperator branch. A portion of the gas mixture to be expanded or the aforementioned fraction of the rectification product is warmed in an unswitched passage of the colder recuperator branch while another fraction of the gas mixture or rectification products is withdrawn form an intermediate location of the regenerator and is passed through the warmed recuperator branch.
Inventors
- 👤 Max Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:49
CPC Classifications
F; F25; F25J; F25J5/00; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
The method defined in claim 1 wherein said recuperator has at least one pair of switchable chambers respectively traversed alternately by said other portions of the warm gas mixture and rectification product, and at least one nonswitchable chamber in heat-exchanging relationship with the first-mentioned chambers and traversed by the portion of the medium withdrawn from said intermediate location of said regenerator, said method further comprising the step of switching the flows of gas between said first-mentioned chambers upon the precipitation in the chamber traversed by the warm gas mixture of high boiling impurities,
Claim 2
Dependent Claim
34 words
The method defined in claim 1 wherein said part of the gas warmed in said cold branch of the recuperator is rEcombined with the remainder of the gas from which said part was derived.
Claim 3
Dependent Claim
43 words
The method defined in claim 1, further comprising the step of post compressing said portion of said medium after heating same in said warm branch of said recuperator and recombining said portion of the medium with the medium from which it was derived.
Claim 4
Dependent Claim
31 words
The method defined in claim 4 wherein the t portion of said medium is mixed with said other portion of said warm gas mixture prior to its passage through said recuperator.
Claim 5
Dependent Claim
39 words
The method defined in claim 1 wherein said portion of said medium is tapped at least at two spaced apart locations from said regenerator with the tapped portions being combined prior to entering said warm branch of said recuperator.
Claim 6
Dependent Claim
35 words
The method defined in claim 6 wherein the medium collecting at said taps is mixed in proportions such that the portion of the medium heated in said recuperator enters the latter at substantially constant temperature.
Claim 7
Dependent Claim
106 words
A heat exchange installation for a gas rectification plant, comprising: a pair of regenerators alternately traversable by a warm gas mixture to be rectified and rectification product capable of cooling the regenerators; a recuperator having a warm and a cold branch traversed in succession by further portions of said mixture and said rectification product in opposite directions; means for passing a work expandable gas through said cold branch of said recuperator; and means for withdrawing from an intermediate location along at least one of said regenerators, the medium traversing same and for passing the withdrawn medium through said warm branch of said recuperator for heating therein.
Claim 8
Dependent Claim
60 words
The installation defined in claim 8 wherein the last-mentioned means includes a pair of taps spaced apart along said one of said regenerators, and temperature-controlled mixing means between said tap and said warm branch for maintaining the temperature of the medium admitted to said warm branch substantially constant by appropriately mixing the portions of said medium derived from said taps.
Claim 9
Dependent Claim
59 words
The installation defined in claim 8 wherein said warm branch of said recuperator has a pair of functionally interchangeable compartments respectively traversed by said rectification product and said mixture in alternate succession during successive half cycles of the operation of the recuperator, and at least one nonswitchable compartment traversed by the portion of said medium withdrawn from said regenerators.
Claim 10
Dependent Claim
23 words
The installation defined in claim 10, further comprising postcompression means between said nonswitchable compartment and the compartment traversed by said warm gas mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |