Presentation on theme: "High Temperature Membrane for OBIGGS Application"— Presentation transcript:
1High Temperature Membrane for OBIGGS Application HoneywellHigh Temperature Membrane for OBIGGS ApplicationLisbon11/15/2004Jim Zhou
2OutlineObjectivesWhy high temperature membrane?Fiber spinning conditionsTest resultsConclusions
3Why high temperature membrane? ObjectivesObjectivesTo develop a high temperature gas separation hollow fiber membrane suitable for the OBIGGS applicationWhy high temperature membrane?Reduce the size and volume of the OBIGG system by taking advantage of higher gas permeability at higher temperatures and reduced cooling requirements at higher OBIGGS operating temperature
4Membrane Material Selection Honeywell’s Innovative High Temperature MembraneHigh O2, N2 permeabilityHigh O2/N2 SelectivityWet spun with very thin selective layer to increase fluxLess susceptible to contaminantsLarge operating temperature and pressure range
5Membranes and Membrane Modules NitrogenOxygenWater VaporNitrogenOxygen and water vapor are “fast” gases which quickly permeate the membrane, allowing nitrogen to flow through the fiber bores as the product stream.Feed AirThis illustration shows how fast gases like oxygen and moisture permeate the surface of the individual membrane fibers while nitrogen molecules remain inside and are delivered as the product gas.
6Membranes and Membrane Modules End PlateEpoxy Tube SheetEnriched Nitrogen Product GasSupport CoreEpoxy Tube SheetOxygen- Enriched AirHollow FibersFeed AirO-RingsThousands of individual fibers wrapped around a core make up the nitrogen generating hollow fiber membrane module. The engineering of the module is important to maximizing the performance of the whole system.
7Fiber Spinning Conditions Phase inversion/Wet spinning processProsCan produce membrane with extremely thin selective layer (Asymmetrical membrane structure)ConsPorous support layer may not be stable at high temperaturesComplex spinning and solvent leaching processMembrane selectivity changes with the amount of solvent left behind
8Typical Fiber Spinning Conditions Fiber spinning condition rangesPolymer dope rate: 1.2 to 2.5 g/min/per strandSpeed: 75 to 250 ft/min(23 to 76 m/min)Center solvent rate: 0.5 to 2.0 ml/minTemperature: Room to 100oCFiber ID: 100 to 160 micronFiber OD: 150 to 300 micron
9Membrane StructureThin skin layer with porous supportHigh gas flux
14Conclusions Membrane is stable at operating temperatures up to 160C Membrane flux increase with increase temperatureMembrane performance influenced by spinning conditionsHigh temperature membrane offers advantages over conventional membranes
15The Fourth Triennial International Aircraft Fire and Cabin Safety Research ConferenceThe Fourth Triennial International Aircraft Fire and Cabin SafetyResearch Conference