TG Flue Gas Cleaning Systems


In the Technical Group "Flue Gas Cleaning Technology" all secondary measures for purification of flue gas coming from combustion of fossil fuels, biomass and waste are central themes.

  • NOx emission control technologies (DeNOx)
    Methods: Selective Catalytic Reduction (SCR); Selective Non-Catalytic Reduction (SNCR)
  • Dust abatement techniques (DeDust)
    Methods: Electrostatic separation, wet / dry (ESP); Filtering separation (B-filter)
  • SO2 emission control technologies (DeSOx)
    Methods: limestone/lime based, bicarbonate; Wet scrubber (FGD), spray-drying and absorption
  • Emission reduction of unburned organic compounds, aerosols, gaseous and particle-bound heavy metals
  • Operational optimization of emission reduction techniques used
  • Reduce the internal energy consumption of emission control techniques
  • Damage analysis of the emission control system
  • Minimum requirements, technical implementation of legal requirements


  • Suggestions for improving the deposition of environmentally relevant emissions
  • Suggestions for reducing the risk of corrosion / deactivation of catalysts
  • Suggestions for reducing the bypass flow and internal requirements

Current Topics

  • Development of emissions control technology for the use in new projects of power stations
  • Implementation of the requirements of the industrial Emissions Directive and the 13th Ordinance of FICA
  • Elaboration and updating of VGB-Standards (Guidelines to Order):
    • VGB-Standard for Type, Operation and Maintenance of Flue Gas Desulphurisation Plants (FGD)
      VGB-S-015-2011-EN - First edition 2011
    • Construction, Operation and Maintenance of Flue Gas Denitrification Systems (DeNOx)
      VGB-S-014-2011-EN (in preparation)
  • R&D projects supported by the Working Panel:
  • Current research projects (selection)
    Project-No. Brief Description

    Studies on the technique of flue gas desulfurization with seawater focused on a simultaneous generation of electricity and drinking water
    The innovation of the R & D project focuses on the use of brine, which is generated during the production of drinking water, in the flue gas desulfurization process of fossil fired power plants. The coupling of the system on both, the material and the energy side leads to a significant reduction of the necessary amount of water (in addition to the already known beneficial effect obtainable by the use of waste heat from the power plant). Thereby resources can be saved and the possibility of effective secondary treatment can be established. In addition, the catalytic effect of trace elements (iron, manganese, etc.) regarding the oxidation can be improved significantly. The salt content is reduced through the back mixing of brine before the discharge, to minimize negative impacts on flora and fauna.

    The research project is funded by the German Federal Ministry of Economics and Technology via the AiF (AiF project no. 17118 N). The duration of the project is two years.

  • Finished research project (selection)
    Project-No. Brief Description
    202 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.
    230 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.
    263 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 2007
    Here you can find all ongoing and concluded research projects for Power Plant Technologies supported by VGB.