Filter Media for Fabric Filter cement pdf

how to choose Filter Media for Fabric Filter cement pdf

1. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
APC –Fabric Filter
FilterMedias

2. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
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Dry filtration medias
Type of filter medias by manufacturing process

3. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Technical demands on filtermedia for
cleanable dry filtration:
High mechanical stability
Filtration efficiency up to 99,9999%
Chemical and thermal resistance
Long term cleanability
Available products for dry filtration
Products for dry filtration:
Woven fabrics
Neddlefelts
Spunbonds

4. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Availableproductsfordry filtration Woven fabricsonly small importance today (exception: glass fabric for reverse air BHs) .
Manufacturing in a weaving loom by
interlacing the length wise yarns (warp)
and the crosswise yarns (weft) with
each other.
Woven fabrics are two-dimensional
filter media, overlapping yarns one to
another.
warpweft
Fiberglass is a woven fabric, but also aramid, polyester, acrylic,
PPS, and PTFE can be provided in both felt and woven
construction.

5. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Availableproductsfordry filtration Needlefelts (NF)used in approx. 90% of applications today.
Needlefelt is produced by matting, c ondensing and pressing fibers together using
barbed needles to interlock carded fibers.
A 120 to 160 mm fiber web is compacted to 1,5 to 2,5 mm neddlefelt.
NF are made from staple fibres and a supporting fabric („scrim“).

6. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Available products for dry filtration Needlefelts (NF)
Area weight is in the range of 300 -800g/m².
Fineness of fibers and their cro ss-section are defining the
specific surface [m²/g] of a needlefelt.
Specific surface, area weight, density and surface
treatment are responsible for filtration efficiency,
cleanability and pressure-drop

7. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Availableproductsfordry filtration Spunbondsespecially used for pleateds elements.
Face View - Magnified 100x
Spunbond
Polyester
Polyester
Needlefelt

8. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
02 October 2018 New PowerPoint Template 8
Dry filtration medias
Type of filter medias by technical characteristics

9. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Filter media portfolio
9
Filter media types
Polypropylene (PP)
Polyacrylonitrile, homopolymer (PAN)
Polyester (PES)
Polyphenylene sulphide (PPS)
m-Aramide (MAR)
Polyimide (PI)
Polytetrafluorethylene (PTFE)
Fiberglass (GL) + ePTFE Membrane Laminate

10. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polypropylene(PP)
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The polymer for polypropylene fibre is manufactured from the parent 
substance propene. The fibre is subsequently produced using a melt 
spinning process
Polypropylene fibres are characterised by their outstanding resistance to 
chemicals and hydrolysis. They can be attacked only by strong oxidation. 
They are used at temperatures up to 90°C under 
conditions where 
polyester cannot be used owing to chemically aggressive environment.
Specific properties Temperature resistanceContinuous: 90 °C/ peak: 100 °C
Melting point160 ‐175 °C
LOI‐value19 %
Density0,9 g/cm³
Moisture pick‐up0% at 65% HR and 20°C
Resistance to hydrolysisExcellent
Acid resistanceExcellent
Alkali resistanceExcellent
Resistance to oxidation        Poor
Resistance to solventsGood
Typical fields of application Dedusting of galvanising plants
Chemical processes

11. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polyacrylonitrile, homopolymer (PAN)
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Specific properties Temperature resistance Continuous: 125°C/ peak: 140°C
Melting pointDecomposition above 240 °C
Spontaneous ignition‐,‐
LOI‐value18 %
Density1,18 g/cm³
Moisture pick‐up                     1 % at 65% RH and 20°C
Resistance to hydrolysisGood
Acid resistanceGood
Alkali resistanceLimited
Resistance to oxidation   Good
Resistance to solventsGood
Typical fields of application Boiler (coal, oil and wood furnaces)
Incineration plants
Drying plants / milling‐drying
Coal grinding plants (mix PES/PAN felt)
(Nonferrous) smelting plant
Asphalt mixing plants
The parent substances of PAN fibre are propene, ammonia and oxygen.
The advantage of this fibre over copolymeric PAN fibres is its higher 
temperature resistance, improved chemical resistance and higher 
strength.
It is used mainly where polyester cannot be used owing to high moisture 
conditions. The fibre has a higher specific surface through
 its kidney‐
shaped fibre cross‐section. It is frequently used as a mixed felt of PES/PAN
Will burn

12. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polyester (PES)
Owing to their favourable cost effectiveness polyester fibres are 
the most frequently used fibre type in filter media. 
This fibre is manufactured by polycondensation in the melt 
spinning process. The chemical parent substances are glycol and 
terephthalate.
Above 80°C sensitive to moisture due to hydrolysis. 
Specific properties
Temperature resistanceContinuous: 140 C / Peak :150 °C
Melting point250 ‐260 °C
Spontaneous ignition point  508 °C
LOI‐value20 %
Density                                         1,38 g/cm³
Moisture pick‐up0,2‐0,5% at 65% RH and 20°C
Resistance to hydrolysis Poor 
Acid resistance    Limited
Alkali resistance        Poor
Resistance to oxidation       Good
Resistance to solventsLimited
Typical fields of
 application
General dedusting
Silo‐/bunker‐mounted filters
Mill dedusting in non‐metallic‐minerals 
industries 
Cement, lime, gypsum
Clinker cooler dedusting
Steel works (electric melting furnaces)
Foundries (sand preparation)
Woodworking industry
Food processing industry (e g. sugar)
Cereals and animal food industry
Will burn

13. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
meta‐Aramide(MAR)
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A high performance aromatic fibre  made from the main components 1,3‐
phenylenediamine and isophthalic acid. DuPont, with their Nomex

brand 
fibre  is one of the most important suppliers.
Consequently filter media made of m‐Aramid are frequently processed 
with an additional protection against acids and hydrolysis. 
Dog bone‐shaped fibre cross‐section with good dust separating efficiency.
Specific properties Temperature resistanceContinuous: 200 °C/ peak: 240 °C
Melting pointDecomposition begins above  370 °C
Spontaneous ignition point         675 °C
LOI‐value26 ‐30%
Density1,38 g/cm³
Moisture pick‐up5% at 65% RH and 20 °C
Resistance to hydrolysis         Limited (Good < 140°C)
Acid resistanceLimited
Alkali resistanceGood
Resistance to oxidationGood
Resistance to solventsExcellent
Typical fields of application Asphalt mixing plants
Dedusting of clinker coolers
Lime shaft kilns
Calcining of gypsum
Dedusting of cupola furnaces
(Excellent resistance to hydro ‐
carbons)
Does not melt or burn

14. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polyphenylenesulfide(PPS)
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The parent substances are p‐dichlorobenzene and sodium sulphide.
Their good resistance to hydrolysis, alkalies and acids makes them an 
alternative to PTFE fibres under certain conditions.
PPS are easily oxidised at increased temperature (above 10% O
2
).
Tri‐lobular and microfibers available
Specific properties Temperature resistanceContinuous: 180°C/ peak: 200 °C
Melting point280 °‐290 °C
Spontaneous ignition point        500 °C
LOI‐value39 ‐41 %
Density1,37 g/cm³
Moisture pick‐up0,6% at 65%  RH and  21°C
Resistance to hydrolysis             Excellent
Acid resistanceExcellent
Alkali resistanceExcellent
Resistance to oxidation             Limited
Resistance to solventsExcellent
Typical fields of application Boiler dedusting (coal und oil furnaces)
Incineration plants (except hospital waste)
Dedusting of drying plants
Dedusting of cement furnaces (limited)

15. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polyimide(PI)
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Polyimides are polycondensates from aromatized monomers with 
particularly high heat resistance
The company Evonikmanufactures  these fibres and markets them 
under the brand name P 84

.
The fibre has good chemical resistance, but this is endangered under 
highly alkaline moisture conditions. Multilobal fibre cross‐section with 
very high fibre surface and very good dust separating efficiency.
Specific properties Temperature resistance         Continuous: 240 °C/ peak 260 °C
Melting point‐, ‐
Spontaneous ignition point          ‐, ‐
LOI‐value38 %
Density1,41 g/cm³
Moisture pick‐up3% at 65 %  RH and 20 °C
Resistance to hydrolysis             Good
Acid resistance                 Good
Alkali resistanceLimited
Resistance to oxidation          Good
Resistance to solvents      Good
Typical fields of application Boiler dedusting (coal and oil furnaces)
Cement kiln dedusting
Incineration plants (including hazardous waste / 
hospital waste)
Calcining of gypsum
Lime shaft kilns
(Nonferrous) metal melting furnaces

16. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Polytetrafluorethylene(PTFE)
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The infusibility of PTFE necessitates a special processing method to manufacture the fibre and this 
causes high costs.
The fibre has unlimited uses in chemical applications. It has poor mechanical properties and high 
area weights are necessary owing to its high specific gravity.
Moderate dust separating power, even with trilobal fibre cross‐section.
Specific properties Temperature resistanceContinuous 260 °C/ peak 280 °C
Melting point 340 °C
Spontaneous ignition point‐, ‐
LOI‐value95%
Moisture pick‐up0% bei 65% RH  and 20 °C
Resistance to hydrolysisExcellent
Acid resistanceExcellent
Alkali resistanceExcellent
Resistance to oxidationExcellent
Resistance to solventsExcellent
Typical fields of application Refuse / hazardous waste incineration
Boiler dedusting without preconnected
neutralisation
Chemical processes
Dedusting of driers at high temperatures

17. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Wovenfiberglass(GL withandwithoutmembrane)
02 October 2018 New PowerPoint Template 17Specific properties Temperature resistanceContinuous 260 °C/ peak 280 °C
Melting point‐, ‐
Spontaneous ignition point‐, ‐
LOI‐value
Moisture pick‐upZERO
Resistance to hydrolysisExcellent
Acid resistanceExcellent
Alkali resistanceExcellent
Resistance to oxidationExcellent
Resistance to solventsExcellent
Typical fields of application hazardous waste incineration
Cement Rotary Kiln dedusting
Insineration plants
Lime shaft kilns
Sintering plants
Typically used as a woven material.
Chemically usable with some limitations. Bad mechanical 
characteristics, high requirements during production of fibre glass, 
high requirements for the cage design.
Due to bad filtration efficiency, ePTFE membr. is required frequenly.

18. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
APC -Fabric Filters
Filter media portfolio
Polypropylene Polyacrylonitrile,
homopolymer
Polyester Polyphenylene
sulphide
m-Aramide Polyimide Polytetrafluorethylene Fiberglass
PP PAN PES PPS MAR PI PTFE GL
DOLANIT®
RICEM®
PROCON®
TORCON®
NOMEX® P84®
PROFILEN®
RASTEX®
TEFLON®
Temperature stability (dry)
- Continuous (°C) 90 125 140 180 200 240 260 250
- Short-term (°C) 100 140 150 200 240 260 280 300
Resistance to (1 = excellent, 2 = good, 3 = limited) :
- Moisture/hydrolysis
123132 1 2
- Mineral acids
122122 1 2
- Organic acids
112121 1 2
- Alkalis
123122 1 3
- Oxidizing substances
322311 1 1
- Organic solvents
211222 1 1
COST $ $$ $ $$$$ $$$ $$$$$ $$$$$ $$$

19. The information contained or referenced in this presentation is proprietary to FLSmidth and is protected by copyright law
Finishing and treatments
Thermal and surface
Impregnations
Conductivity
Coatings
Spark protection
ePTFE-membrane
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