EP0129304A2
Expired / Lapsed
EP
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Molecular sieve type gas separation systems
Assignee: Honeywell Normalair Garrett Holdings Ltd
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Filing: 1984-03-16
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Granted: —
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Expires: 2004-03-16
Abstract
Abstract The sieve beds (11,12,13) of a molecular sieve type gas separation system (10) are cyclically subjected to a charge/adsorption on-stream phase followed by a purge// desorption regeneration phase and each bed is arranged to be open to ambient atmospheric pressure or a pressure related thereto during the regeneration phase. A fixed logic sequencer unit (35) provides two different overall cycle times and fixes the relative durations of each phase within the overall cycle times. A switching device (40), which preferably includes a flueric partial pressure sensor (Figure 2), responds to the pertaining concentration of a constituent gas in the product gas delivered by the system and switches between the two overall cycle times so as to maintain the concentration of the constituent gas in the product gas within predetermined limits.
Inventors
- 👤 Humphrey Albert Samuel Hamlin
- 👤 James Cornish Taylor
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 01:29
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0423; B01D53/047; B64; B64D; B64D13/00; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0259; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2259/00; B01D2259/40; B01D2259/40007; B01D2259/40009; B01D2259/40011; B01D2259/40043; B01D2259/4005; B01D2259/40052; B01D2259/403; B01D2259/45; B01D2259/4566; B01D2259/4575; B64D13/06; B64D2013/0603; B64D2013/0681; C01B2210/00; C01B2210/0043; C01B2210/0046
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A molecular sieve type gas separation system adapted to deliver enriched product gas to an outlet, the system comprising at least one sieve bed (11, 12, 13) and control means (35) for cyclically subjecting said bed to a charge/adsorption on-stream phase followed by a purge/desorption regeneration phase, said control means being arranged to provide that during said regeneration phase the gas pressure in said bed at least substantially equals the ambient atmospheric pressure or a pressure related thereto and that for a predetermined range of ambient atmospheric pressure the relative durations of the said phases are fixed, characterised by means (40) responsive to the pertaining concentration of a desired constituent in the product gas delivered to the outlet and arranged to adjust the overall cycle time in such manner that this said concentration is maintained within predetermined limits.
Claim 2
Dependent Claim
138 words
A molecular sieve type gas separation system adapted to deliver enriched product gas to an outlet, the system comprising at least one sieve bed (11, 12, 13) and control means (35) for cyclically subjecting said bed to a charge/adsorption on-stream phase followed by a purge/desorption regeneration phase, said control means being arranged to provide that during said regeneration phase the gas pressure in said bed at least substantially equals the ambient atmospheric pressure or a pressure related thereto and that for a predetermined range of ambient atmospheric pressure the relative durations of the said phases are fixed, characterised by means (40) responsive to the pertaining concentration of a desired constituent in the product gas delivered to the outlet and arranged to adjust the overall cycle time in such manner that this said concentration is maintained within predetermined limits.
Claim 3
Dependent Claim
47 words
A molecular sieve type gas separation system as claimed in Claim 1, characterised in that said control means comprises a fixed logic sequencer (35) for controlling sequential operation of charge valves (26, 27, 28) and vent valves (29, 30, 31) associated with each bed (11, 12, 13).
Claim 4
Dependent Claim
36 words
A molecular sieve type gas separation system as claimed in Claim 1 or Claim 2, characterised in that said means responsive to the pertaining concentration of the said constituent comprises a flueric partial pressure sensor (43).
Claim 5
Dependent Claim
39 words
A molecular sieve type gas separation system as claimed in any preceding claim, characterised in that said control means provide, at least within one said predetermined range of outlet ambient pressure, phase relative durations in a ratio of 1:1.
Claim 6
Dependent Claim
159 words
An on-board oxygen generating system for an aircraft, comprising a molecular sieve type gas separation system arranged to deliver oxygen-enriched air to an outlet by adsorbing nitrogen from air fed to the system, the system including at least two sieve beds (11/12/13) and control means (35) for cyclically subjecting each said sieve bed to a charge/adsorption on-stream phase followed by a purge/desorption regeneration phase and so that during its regeneration phase each bed is opened to ambient atmospheric pressure or a pressure related thereto, characterised in that for a predetermined range of ambient atmospheric pressure the control means provide two different selectable overall cycle times with the relative durations of the phases being fixed, and by flueric partial pressure sensor means (43) responsive to the pertaining concentration of oxygen in the oxygen-enriched air delivered to the outlet and adapted to switch the control means between the two cycle times so as to maintain the oxygen concentration within predetermined limits.
Claim 7
Dependent Claim
159 words
An on-board oxygen generating system for an aircraft, comprising a molecular sieve type gas separation system arranged to deliver oxygen-enriched air to an outlet by adsorbing nitrogen from air fed to the system, the system including at least two sieve beds (11/12/13) and control means (35) for cyclically subjecting each said sieve bed to a charge/adsorption on-stream phase followed by a purge/desorption regeneration phase and so that during its regeneration phase each bed is opened to ambient atmospheric pressure or a pressure related thereto, characterised in that for a predetermined range of ambient atmospheric pressure the control means provide two different selectable overall cycle times with the relative durations of the phases being fixed, and by flueric partial pressure sensor means (43) responsive to the pertaining concentration of oxygen in the oxygen-enriched air delivered to the outlet and adapted to switch the control means between the two cycle times so as to maintain the oxygen concentration within predetermined limits.
References Cited (Backward Citations)
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