Flue Gas Desulphurization (FGD)

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Information @ a Glance

  • Flue Gas Desulphurization is widely acknowledged as today’s state-of-the art technology for removing sulfur dioxide from the exhaust flue gas in coal- and oil-fired power plants.
  • Although the FGD process was originally established for environmental purposes, a large amount of high quality, synthetic gypsum is created as a byproduct of the scrubbing process.
  • Wet flue gas desulfurization or scrubber systems are an excellent way of reducing the sulfur dioxide emissions caused by coal combustion boilers.
  • Conventional wet FGD systems are in successful operation at a large number of coal-fired facilities ranging in size from small, individual applications to large utility applications of more than 1000 MW.
  • FGD wastewater treatment has primarily consisted of physical/chemical processes for the removal of total suspended solids (TSS) and heavy metals.
  • An innovative and patent-pending biological treatment system, iBIO™ technology, developed by Degremont Technologies – IDI, provides an enhanced treatment option for the removal of residual selenium compounds from FGD wastewaters.
  • The new FGD wastewater method requires the analysis of two new QC samples, a Synthetic FGD Matrix Sample and a Fortified FGD Matrix Sample.
  • Flue gas desulphurization (FGD) gypsum is understood as being the hydrated calcium sulphate (CaSO4 • 2 H2O) produced within the flue gas desulphurization of power stations. FGD gypsum is also referred to as raw gypsum.
  • The great majority of recently proposed and installed FGD systems for coal-fired units have utilized the wet limestone forced oxidation (LSFO) process.
  • Cost estimate modeling for enhancement of mercury emissions control with a wet FGD system calculates the annual levelized costs following the basic methodology of EPRI’s TAG™ Technical Assessment Guide.

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