Advances in Fiber Technology for High-Performance Filtration

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Advances in Fiber Technology for High-Performance
Filtration
Jeffrey S. Dugan
and
Edward C. Homonoff
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bag house
filtration unit
Coal power plant process diagram, featuring
exhaust gas filtration
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soot
hot air
bag
H2O
filters
SOx
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Typical Baghouse Fabric
needlepunched nonwoven 16 oz./yd2
tightly needled to control permeability
optional scrim for dimensional stability
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Typical Baghouse Fibers
fiber
chemical resistance
cost/lb
Teflon
good resistance pH 1-14
28-32
P84
poor acid resistance
13-15
Kermel
poor acid resistance
12-14
Nomex
poor acid resistance
10-12
Glass
v. poor acid resistance
low
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Problems
cost
availability
filtration efficiency
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Solution PPS
(polyphenylene sulfide)
cost
v
availability
?
v
?
filtration efficiency
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S
Polyphenylene sulfide
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PPS Properties
high tenacity
low shrinkage
flame resistance
thermoplasticity
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PPS Wet Heat Resistance
160º C autoclave (6.5 kg/cm3)
100
PPS
80
strength retention
meta-aramid
PET
60
0
24
48
72
96
120
144
days exposed
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PPS Chemical Resistance
48 Sulfuric Acid
100
PPS
meta-aramid
80
strength retention
60
0
15
30
45
60
75
90
days exposed
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Shaped Cross Sections
4DG
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Bicomponent Fibers
PPS sheath
PET core
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Bicomponent Fibers
PPS
PET
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Bicomponent Fibers
3 denier
0.19 denier
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Solution PPS
(polyphenylene sulfide)
cost
v
availability
v
filtration efficiency
v
v
healthy lungs
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