P84® Filtration Applications

Cement

Albarrie produces filter media using P84 - the best Polyimide around

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 the 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®

CASE STUDIES

Albarrie sells the best grade of Polyimide - P84
Albarrie sells the best grade of Polyimide - P84
Albarrie sells the best grade of Polyimide - P84
Albarrie sells the best grade of Polyimide - P84

Waste-To-Energy

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

CASE STUDIES

Albarrie sells the best grade of Polyimide - P84


Albarrie produces filter media using P84 - the best Polyimide around

Energy from Coal & Biomass

Albarrie produces filter media using P84 - the best Polyimide around

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.

Sheldon Station reports significant cost savings using P84® filter material in its baghouses over the past 17 years. The cost savings fall into two categories: increased energy sales and decreased replacement bag cost. Reduced pressure-drop through the P84® media reduced ancillary loads, principally reducing induced draft fan power by 87,000 MWh, saving $6.1 million. Extended bag life when using P84® media also reduced the cost of replacement bags by $1.5 million. (Nathan Schindler, 2019, p.2)

CASE STUDIES

Albarrie sells the best grade of Polyimide - P84
Albarrie sells the best grade of Polyimide - P84
P84 felt and P84 scrim were determined to be the most cost-effective configuration based on the plant's particle size distribution, temperature of the bag, and level of acid products in the exhaust gas.

Process Filters

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.

 

Metallurgical Processing

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.

Albarrie produces filter media using P84 - the best Polyimide around