Filter Bags
in Thermal Waste Treatment Plants

Waste treatment plants impose high demands on dedusting. This concerns not only the thermal and chemical resistance of the filter media, but also the separation performance. According to the seventeenth regulation of the Federal Pollution Control Act (17. BImSchV) in Germany, a dust emission limit of less than 10 mg/Nm ³ has to be maintained. The required emission limits can be easily and safely reached with needlona®-filter media treated with the appropriate chemical finish.

Typical Operating Conditions:

 

Cont. Temperature (°C): 212-428°F
Peak Temperature  (°C): Orientation to the maximum peak temperature of the fibre polymers used
Dust: Fly ash, sorption products
Dust Properties: Free-lowing to agglomerating
Dust Source: Cyclone, different sorption processes, grate firing
Harmful Gases: H2O, HCl, HF, NOx, SOx
Cleaning Process: Pulse jet
Fuels: Industrial, municipal and hospital waste, sewage sludge

 

Specific Requirements for Filter Media in Thermal Waste Treatment Plants:

  • High temperature resistance 
  • Good chemical resistance 
  • High separation performance

Srim and Fibre Types for Filter Media in Thermal Waste Treatment Plants:

Because of their high temperature and good chemical resistance, needlona® high-performance filter media made of Polyphenylene Sulfide (PPS)-, Polyimide (PI)- and Polytetrafluoroethylene (PTFE)-fibres are especially suitable in dedusting of thermal waste treatment plants

In addition, blends of the aforementioned fibres on a chemical and thermal resistant PTFE-scrim have also proven their value for this application. By using PTFE-scrim, the strength of the filter media is maintained over a long period of time, even under challenging operating conditions.

Depending on the flue gas cleaning process, we recommend the needlona® high-performance filter media refined with a CS30®  or CS31® protective finish. This finish increases the separation efficiency and thereby significantly increases the filtration performance of the filter media. 

All filter media models are also available as MPS® filter media. The enlarged filter area of the MPS filter media ensures highly effective separation of the dusts.

 

PM-Tec® filter media made of needlona® needle felt or fiberglass fabric are particularly suitable for fine dust filtration. Owing to a laminated ePTFE membrane, very fine dust particles are already separated on the surface. PM-Tec® filter media thereby allow compliance with minimal dust emission limit values.