Flue Gas Cleaning Technology

Tasks

In the Working Panel “Flue Gas Cleaning Technology” all techniques of flue gas cleaning are dealt with at furnaces for fossil fuels, biomass and wastes.
(I:e. combustion technical measures are not included).

• SO ₂ emission reduction techniques (FGD); processes: wet, limestone/lime basid, spray absorption, dry absorption
• NO _x emission reduction techniques (DENOX); processes: Selective Catalytic Reduction (SCR high dust, SCR low dust, SCR tail end), Selective Non Catalytic Reduction (SNCR)
• Dust precipitation/ separation of FGD by-products, processes: ElectroStatic Precipitation (ESP), Fabric Filter (FF), emission reduction of aerosols, of gaseous and particulate matter bound heavy metals
• Emission reduction of unburned organic compounds
• Optimisation of operational used emission reduction techniques
• Decrease of internal energy consumption by emission reduction techniques
• Damages at flue gas cleaning equipment
• Technical realisation of legal requirements

Service

• Consulting in following areas
  - measures to increase reduction of environmentally significant emissions,
  - measures to limit risks of corrosion / deactivation of catalysts,
  - measures to limit by-pass flow,
  - measures to limit internal consumption

Current Topics

• Technical implementation of new regulations on waste incineration, fossil fuel combustion biomass and waste co-combustion
• Options and impacts of Wet Stack application due to no longer legally required minimum discharge temperature
• Further development of flue gas cleaning techniques for application when new power plants are planned

Current research projects

• FGD-Fluid dynamics.
  This project was applied to theoretically research whether aimed droplet collisions can increase the surface of liquid for SO ₂ reduction without significant increase of liquid to gas (l/g) relation. Finished: May 2002.
• Optimised FGD nozzle distribution modelling.
  Different nozzle distributions have been simulated to reach any part of the scrubber volume in the best way. The results were very promising, and support future application on real scrubbers. Finished: End of 2004.
• Flow correlated positioning of nozzles.
  Planned is a modelling of FGD operation regarding droplet collision to reduce by-pass flows at the wall and by streak evolution. This modelling is applied to optimise positioning of nozzles in real scrubbers by a commercial CFD program.
  Start expected: Begin of 2005