The Flue Gas Desulfurization Process

The Flue-Gas Desulfurization (FGD) process utilizes a set of technologies to remove sulfur dioxide (SO2) from the flue gas emissions of coal-fired power plants. FGD systems were developed as a response to the exhaust – flue gases – from fossil fuel-burning plants, principally coal-burning, that posed both an environmental and human health hazard.

S02 can be removed from flue gases by a variety of methods. For a typical coal-fired power plant, FGD systems will remove ~95% of the SO2 in the flue gases. FGD predominantly employs two methods of filtering the emissions (dry or wet scrubbing) for coal-burning plants to be in compliance with regulations mandated by the EPA’s Effluent Limitation Guidelines (ELG).

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