Download - 11Evonikupgrade baghouses
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SUCCESSFUL OPERATION
OF BAG HOUSESWITH NEEDLE FELTS
Georg Rathwallner
Evonik Fibres GmbH
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Table of content
Bag house operating and maintenance costs
Bag material selectionBag condition monitoring
Typical failure patterns
Operating experience
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Bag house operation and
maintenance costs
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Table of content
Bag house operating and maintenance costs
Bag material selectionBag condition monitoring
Typical failure patterns
Operating experience
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Peak temperature resistance of fibres
140150
200220
260260
0
50
100
150
200
250
300
PAN PES PPS m-Ar. PI PTFE
** ActualActual applicationapplication temperaturetemperature isis belowbelow thethe shownshown maximummaximum dependingdepending onon thethe flueflue gasgas
compositioncomposition andand bagbag lifelife expectationexpectation!!
PROCON
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Resistance on a scale from 1-4; 1 indicating the best value and 4 weak performance
< 24042-411Glass< 2404111PTFE
160-20012-41-21-2Polyimid
160-1802-33-43-42+Polyamidimid
160-1802-33-442M-Aramid
140-1702-31-213PPS
110-1303224+PAN
< 13033-444PET
cont. op.
temperature
filtration
efficiency
acidshumid
heat
oxidation
PROCON
Properties of filter bag materials
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Specific surface of different fibres
0
200
400
600
0
PROCONtrilobal
m-ARAMIDEPPS
FibreSurface(m/kg)
2,2 dtex round (206 m/kg)
Fiber Titre (dtex)
P84
P84 (polyimide)
Procon(PPS)
2,2 dtex
Procon
(PPS)1,7 dtex trilobal (317 m/kg)
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Filter bag materials by application
PAN
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Table of content
Bag house operating and maintenance costs
Bag material selection
Bag condition monitoring
Typical failure patterns
Operating experience
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Table of content
Bag house operating and maintenance costs
Bag material selectionBag condition monitoring
Typical failure patterns
Operating experience
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Typical failure patterns
contamination from the clean
gas side - no penetrationthrough the felt
penetration through leakages
or holes
penetration through the felt
(insufficient filtration efficiency or
too frequent cleaning/too low
cleaning set point)
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Typical failure patterns
Abrasiontypically related to high local gas velocity and dust load
bag materials show different abrasion resistance, but problems ofinhomogenious gas distribution have to be solved to get satisfactoryoperating behaviour
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Typical failure patterns
Cracks
as a result of chemical ageing (loss of tenacity below critical limits)as a result of mechanical burden
e.g. as a result of dust penetration (high dp, frequent cleaning, internal abrasion)
As a result of damaged cages or contact between bags or bags and wall
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Typical failure patterns
Membrane damage along a supporting cage wire- Penetration of dust into the glass fabric results in internal abrasion
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Table of content
Bag house operating and maintenance costs
Bag material selectionBag condition monitoring
Typical failure patterns
Operating experience
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Operating experience
Comparative test in a finish mill operating conditions
2 similar grinding lines with ball mills
Bag filter :
size: 720 m
A/C ratio: 1,2-1,3 m/min
dust load: 500 g/m
Temperature: 85 C
As a result of an increase of the a/c-ratio the bag
life of the polyester felts dropped from 18 to 7months.
Problems with increasing differential pressure anddust emissions were experienced.
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Comparative test in a finish mill - felt construction
40-50 l/dm2min40-50 l/dm2minAir permeability @
200 Pa
Clean gas
side
scrim
Filtration
side
PETPETPETPET
600 g/m2600 g/m2Felt weight
differential pressure flange-flange:
1500 Pa,
stable for>48 months
Bag change after
7 months
Performance
40% P84 / 60% PETPET with scrim
Bag
construction
P84/Polyester
Polyester Fine
Fibre
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Another comparative test in a finish mill:
bag material after 29 months operation
65 6988-8939-42washed
(in a conventional laundry machine)
29-3439-4815-22after simulated pulse cleaning
15-1928-2913-14as received
PAN/PET
+P84
P84Glass/
membrane
Air permeability
[l/(dm.min) @ 200 Pa]
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CLINKER COOLER JAPAN
P84/P84, 4450 mP84/P84, 4450 m
Pulse Jet - On LinePulse Jet - On Line
TempTemp:: 150 C150 CACR:ACR: 1,04 m/min1,04 m/min
HH22O:O: 0-3 vol%0-3 vol%
OO22:: 20,5 vol%20,5 vol%
Emission: < 10 mg/NmEmission: < 10 mg/Nm
lifetime of filterbags: >5 years
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KILN/MILL FILTER NORWAY
P84/HybridP84/Hybrid scrimscrim, 17.200 m, 17.200 m
Pulse JetPulse Jet On LineOn Line
FlowFlow:: 2 x 230.000 Nm/h2 x 230.000 Nm/h
TempTemp:: 170-180C (170-180C (maxmax250C)250C)
ACR:ACR: 1,37 m/min1,37 m/min
HH22O:O: 14 - 20 vol%14 - 20 vol%
OO22:: 8 - 12 vol%8 - 12 vol%
SOxSOx:: 115 - 1.000 mg/Nm115 - 1.000 mg/Nm
NOx:NOx: 780 - 900 mg/Nm780 - 900 mg/Nm
DustDust:: 11 65 g/Nm65 g/Nm
Emission: < 5 mg/NmEmission: < 5 mg/Nm
# Compound & Kiln Op.# Incin. of Haz. Waste
# 2 x 3.584 Filterbags
# Start Up: October 1998
Lifetime: 8years
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KILN/MILL FILTER NORWAY
P84 bag after 8 years in
operation
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Kiln/raw mill filter UAE
100% P84,100% P84,
1689616896 bagsbags (160mm x 6000mm)(160mm x 6000mm)
appapp. 50.000 m. 50.000 m
Pulse JetPulse Jet On LineOn Line
FlowFlow:: Nm/hNm/h
TempTemp:: 150-200C (150-200C (maxmax 260C)260C)
ACR:ACR: 1 m/min1 m/min
HH22O:O: 9 - 18 vol%9 - 18 vol%
OO22:: 4 - 13 vol%4 - 13 vol%
SOxSOx:: 150 - 320 mg/Nm150 - 320 mg/Nm
NOx:NOx: 190 - 310 mg/Nm190 - 310 mg/Nm
DustDust:: 4040 170 g/Nm170 g/Nm
Emission: < 5 mg/NmEmission: < 5 mg/Nm
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SUCCESSFUL OPERATION
OF BAG HOUSESWITH NEEDLE FELTS
Georg Rathwallner
Evonik Fibres GmbH