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Applications > Flue Gas treatment > FGD in Power generation

 

 

Flue Gas Desulfurization in power generation


Source: VGB Powertech 2009-2010 - IEA
 Power generation based on fossil fuel combustion produces flue gases. Nowadays, legislation (CAIR in US, LCP directive in EU...) imposes emission limit for most pollutant (dust, acid components, heavy metals...). Consequently, most oil-, coal- & lignite- fired power plants have to be equipped with emission control system in order to comply with the relevant legislation.

Even if the share of renewable, biomass and low specific CO2 emission (like gas) is increasing, coal keep a major role in power generation as shown on the graph.

Coal- and lignite- fired power plants are, in particular, concerned by limits on sulfur oxides (SO2 & SO3). Sulfur dioxide is one of the component responsible for acid rains formation. As a result of stringent environmental protection regulations that have been enacted in a great many countries, SO2 is now being removed from flue gases by a variety of methods.


Available calcium based FGD technologies on the market

Calcium products (Lime, Limestone...) are extensively used for removal of sulfur oxides from flue gases. Indeed, Calcium reagents are the sorbent in 96% of the installed FGD capacity worldwide. Engineering companies propose currently technologies to remove up to 99% SO2, based on the following "reaction":

The Calcium-based DeSOx processes used worldwide are classified in 2 major families, illustrated on this section:


  • DRY FGD including

  • WET FGD: including
    •
    • Limestone forced oxidation process (LSFO),  more info on this process>>>
    • wet high-calcium lime process (WLime),
    • magnesium-enhanced Thiosorbic® lime process (MEL process).
        		   
        Source: IEA - Coal Power database 2008

         

         

        While not beeing an engineering companies, CARMEUSE presents on this site some market information on FGD processes. Indeed, Carmeuse has over 30 year experience in supplying customer with premium FGD reagent including support and expertise in this application.

         

         

        See also:

         

        - Dry Lime FGD process description
        - FGD Technical papers & reports
        - Flue Gas treatment
        - Wet Limestone FGD process description
        - Wet Magnesium Enhanced Lime FGD process description