page 1 honeywell high temperature membrane for obiggs application lisbon 11/15/2004 jim zhou
TRANSCRIPT
Page 1
HoneywellHoneywell
High Temperature Membrane for OBIGGS Application
Lisbon11/15/2004
Jim Zhou
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OutlineOutline
• Objectives• Why high temperature membrane?• Fiber spinning conditions• Test results• Conclusions
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ObjectivesObjectives
• Objectives
To develop a high temperature gas separation hollow fiber membrane suitable for the OBIGGS application
• Why 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
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Membrane Material SelectionMembrane Material Selection
Honeywell’s Innovative High Temperature Membrane
• High O2, N2 permeability
• High O2/N2 Selectivity
• Wet spun with very thin selective layer to increase flux
• Less susceptible to contaminants
• Large operating temperature and pressure range
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Membranes and Membrane ModulesMembranes and Membrane Modules
This 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.
Feed Air
Nitrogen
Oxygen
Water Vapor
Nitrogen
Oxygen and water vapor are “fast” gases which quickly permeate the membrane, allowing nitrogen to flow through the fiber bores as the product stream.
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Membranes and Membrane ModulesMembranes and Membrane Modules
Thousands 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.
End Plate
Epoxy Tube Sheet
Support Core
Feed Air O-Rings
Hollow Fibers
Oxygen-Enriched Air
Epoxy TubeSheet
EnrichedNitrogenProduct
Gas
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Fiber Spinning ConditionsFiber Spinning Conditions
Phase inversion/Wet spinning process
PolymerSolvent
Non-SolventOther Additives
Core Fluid
Water Bath
Leaching
Dry Air
• Pros Can 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
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Typical Fiber Spinning ConditionsTypical Fiber Spinning Conditions
• Fiber spinning condition ranges
Polymer 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
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Membrane StructureMembrane Structure
• Thin skin layer with porous support
• High gas flux
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Test ResultsTest ResultsO2/N2 Selectivity vs. O2 Flux
0
2
4
6
8
10
12
0 2 4 6 8 10 12
O2 Flux
O2/
N2
Sel
ecti
vity
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Test ResultsTest Results
Flux Rates Vs. Time at 160C
0
5
10
15
20
25
30
35
40
45
1/15 1/20 1/25 1/30 2/4 2/9 2/14 2/19 2/24
Date
Flu
x
F_inlet
F_prod
F_perm
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Test ResultsTest Results
Oxygen Concentration Vs. Time at 160C
0
5
10
15
20
25
30
35
1/15 1/20 1/25 1/30 2/4 2/9 2/14 2/19 2/24
Date
Oxy
gen
vo
lum
e %
O2_inlet
O2_prod
O2_perm
Start of 160C Test
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Air Separation ModulesAir Separation Modules
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ConclusionsConclusions
• Membrane is stable at operating temperatures up to 160C• Membrane flux increase with increase temperature• Membrane performance influenced by spinning conditions• High temperature membrane offers advantages over
conventional membranes
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The Fourth Triennial The Fourth Triennial International Aircraft Fire and Cabin Safety International Aircraft Fire and Cabin Safety Research ConferenceResearch Conference
The Fourth Triennial The Fourth Triennial International Aircraft Fire and Cabin Safety International Aircraft Fire and Cabin Safety Research ConferenceResearch Conference