Flue-gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes such as waste incineration, petroleum refineries, cement and lime kilns.
Methods
Since stringent environmental regulations limiting SO2 emissions have been enacted in many countries, SO2 is being removed from flue gases by a variety of methods. Common methods used:
Wet scrubbing using a slurry of alkaline sorbent, usually limestone or lime, or seawater to scrub gases;
Spray-dry scrubbing using similar sorbent slurries;
Wet sulfuric acid process recovering sulfur in the form of commercial quality sulfuric acid;
SNOX Flue gas desulfurization...