Adsorption onto Activated Carbon or Lignite Coke

Both mercury and dioxins/furans can be adsorbed onto activated carbon or lignite coke and then removed from the flue gas.

Depending on the overall flue gas treatment approach, the activated carbon or lignite coke can be introduced and subsequently ejected at different stages of the process:

• In dry sorption (XeroSorp): Introduced into the XeroSorp reactor and removed at the fabric filter (residue discharge)

• In the semi-dry sorption process (Kanadevia Inova SemiDry): Introduced into the SemiDry reactor and removed at the fabric filter (residue discharge)

• In a counterflow process: Injected into the flue gas duct before the fabric filter and removed at the fabric filter (residue discharge)

• In a wet scrubber with a ringjet stage (multi-venturi stage): Injected into the flue gas duct before the wet scrubber, removed at the ringjet stage and finally ejected via the scrubber blowdown

• In a wet scrubber without a ringjet stage (multi-venturi stage): Suspension of activated carbon or lignite coke injected directly into the sump of the packed bed stage; ejected via the scrubber blowdown and removed in a lamella separator

The main advantages of adsorption onto activated carbon or lignite coke:

• Can easily be integrated into the various processes for removing acid gases (XeroSorp, SemiDry, wet scrubber)

• Very simple system with only a small number of components (storage and conveying)

• Proven technology with a long and successful track record in industry