High Temperature Filtration
P84® high performance polymer fibres are among the best suitable filter fabric base materials for flue gas dedusting at temperatures up to 260 °C.
Most of the relevant industrial dedusting processes such as filtration units for municipal waste incinerators, cement plants, coal fired boilers and metallurgical processes operate within a range between 100 °C and 260 °C.
The profile makes the difference
The unique multilobal profile of P84® fibres creates an extremely high specific surface area. The guarantee for advanced filtration performance and fulfillment of guarantees.
P84® Applications in Dry Filtration
Changing flue gas conditions are caused by using a variety of fuels, as well as switching the kiln filter from direct mode to compound mode. High CO and Volatile Organic Compounds (VOC) values can be generated by the extensive use of secondary fuels in the precalciner. The partly abrasive dust is a crucial parameter for the filter media in terms of delamination. Because of the high alkaline content, the bypass filter is a true challenge for the filter media.
The ever increasing demand for higher cement quality is a challenge for the grinding system and the high amount of fine dust requires a highly effective filter media. Therefore P84® based filter media can be found in following filter units of a cement plant.
- Kiln Filter: P84®
- Clinker Mill Filter: P84® blended with PET and PAN
- Alkali Bypass Filter: P84®/PTFE blends
- Clinker Cooler Filter: P84®
Increased dust emissions are an absolute disaster for a WTE plant. Inhomogeneous fuel quality requires a highly flexible flue gas treatment system, including the bag filter unit being the barrier for all solid substances. Due to its filtration performance, P84® based filter bags are used in all common process variations of flue gas treatment systems of WTE plants. The main benefits are a low and stable residual pressure drop and long filtration cycles. High collection efficiency is achieved for fine particulate also. This ensures low emissions and an efficient use of the absorbent.
Where are P84® based filter media installed?
- In the main filter unit of semi dry and conditioned dry sorption systems
- In the primary or tail end filter unit of 2 stage wet scrubbing systems
Flue gas treatment systems are a necessary component of energy plants.
In order to keep the overall performance high, the energy consumption of
the FGD plant has to be low. P84® based needle felts are known to ensure
low emissions and a stable pressure drop of the filter plant.
When using biomass the operation load of the plant varies in a wide range. Operation at low boiler load sometimes causes high values of unburnt hydrocarbons and temperature fluctuations.
The design of the flue gas treatment system can be different. The bag filter can be operated without neutralisation of acidic components, or the desulphurisation unit is downstream the filter unit, like it can be found in most coal fired boiler systems. Further it can be combined with the filter unit. This is done by using a dry sorption system, which is common for biomass fired plants. No matter how the FGD system looks like, P84® is suitable to be at least one of the basic components of the filter media
A wide range of operating temperatures and the presence of explosive environments are the characteristics of flue gases in the steel industry.
Covering temperature peaks up to 260°C and having a limiting oxygen
index of 38%, P84® is capable to deal with sparks, varying oxygen contents
and high temperatures.
The glass transition temperature of 315°C ensures the physical integrity of the fibre, even when the temperature limits are exceeded. Volume flows change due to the discontinuous operation of many processes. P84® prevents from dust penetration if the a/c ratio or the dust load reach peak values.
Whenever filtration processes are realized at elevated temperatures, P84® is a viable option. Due to its combination of physical and chemical performance, P84® is the superior fibre for a wide range of applications. Further, P84® is the ideal partner in blends with other fibres, whenever another base material is used for technical or economical reasons.