2.4 Flue Gas Treatment

Industrial flue gas cleaning plant

The process flow diagram illustrates a dry adsorption system, used to clean flue gas from a large municipal waste incineration plant. The flue gases are cooled in economisers to the correct temperature for efficient reaction. Hydrated lime is injected for the control of acid gases together with powdered activated carbon type Filtracarb FGT Plus, which is used for the removal of gaseous heavy metals and dioxins. The flue gases react with these materials in the ducts and fabric filters, where collection takes place together with the fly ash.

To maximise the performance of the hydrated lime and Filtracarb FGT Plus, a portion is recirculated and reinjected into the compact reactor, together with fresh material. THe remaining part of the dust is is conveyed from the fabric filter to the end product silo for final disposal.

In addition to the Filtracarb FGT Plus, CPL Carbon Link has developed a specialised product for use in the treatment of flue gases containing high levels of mercury, typically found in clinical waste incinerators. This product, type Filtracarb IPK, is treated with a chemical additive to enhance the adsorption of mercury in the system, thus allowing the use of standard process conditions to treat a more rigorous duty.

The key features of these products are; High pore volume to maximise adsorptive capacity Fine particle size to optimise adsorption kinetics Inert materials for safe usage Dioxin removal efficiency > 99.9% Gaseous heavy metal removal efficiency > 98.5%

Flue gas cleaning plant

Typical Product Properties