Honeywell High Temperature Membrane for OBIGGS Application Lisbon
Honeywell High Temperature Membrane for OBIGGS Application Lisbon 11/15/2004 Jim Zhou Page 1
Outline • • • Objectives Why high temperature membrane? Fiber spinning conditions Test results Conclusions Page 2
Objectives • 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 Page 3
Membrane Material Selection Honeywell’s Innovative High Temperature Membrane • High O 2, N 2 permeability • High O 2/N 2 Selectivity • Wet spun with very thin selective layer to increase flux • Less susceptible to contaminants • Large operating temperature and pressure range Page 4
Membranes and Membrane Modules Nitrogen Oxygen Water Vapor Nitrogen Feed A ir Oxygen and water vapor are “fast” gases which quickly permeate the membrane, allowing nitrogen to flow through the fiber bores as the product stream. 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. Page 5
Membranes and Membrane Modules End Plate Epoxy Tube Sheet Support Core Enriched Nitrogen Product Gas Epoxy Tube Sheet Oxygen. Enriched Air Hollow Fibers Feed Air O-Rings 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. Page 6
Fiber Spinning Conditions Phase inversion/Wet spinning process • Pros Ø Can produce membrane with extremely thin selective layer (Asymmetrical membrane structure) • Cons Ø Porous support layer may not be stable at high temperatures Ø Complex spinning and solvent leaching process Ø Membrane selectivity changes with the amount of solvent left behind Page 7
Typical Fiber Spinning Conditions • Fiber spinning condition ranges w Polymer dope rate: w Speed: w Center solvent rate: w Temperature: w Fiber ID: w Fiber OD: 1. 2 to 2. 5 g/min/per strand 75 to 250 ft/min(23 to 76 m/min) 0. 5 to 2. 0 ml/min Room to 100 o. C 100 to 160 micron 150 to 300 micron Page 8
Membrane Structure • Thin skin layer with porous support • High gas flux Page 9
Test Results Page 10
Test Results Page 11
Test Results Page 12
Air Separation Modules Page 13
Conclusions • • Membrane is stable at operating temperatures up to 160 C Membrane flux increase with increase temperature Membrane performance influenced by spinning conditions High temperature membrane offers advantages over conventional membranes Page 14
The Fourth Triennial International Aircraft Fire and Cabin Safety Research Conference Page 15
- Slides: 15