High Temperature Filtration in energy plants

Coal-based power generation is a time-honored technology. It will be replaced by renewable energy from wind, solar or biogas sources sooner or later, but as long as it maintains the energy supply as a bridge technology, its emissions must be kept as low as possible. The highly efficient filter media made of polyimide fibers P84® from Evonik keep exhaust gases released from coal-based power generation below emission limits.

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

P84® polyimide fibers stand for their high filtration efficiency thanks to their multilobe design. They retain a much higher permeability throughout their lifecycle. As a result, they reduce the energy consumption significantly in comparison to other filter bags available on the market.

Filter media made of P84® polyimide fibers by Evonik therefore not only cut back on flue gas emissions, but also reduce energy costs.