Flue Gas Desulfurization (FGD)
The burning of coal produces sulfur dioxide (SO2) gas.flue gas desulfurization (FGD) technology for reducing SO2 emissions.FGD systems introduce a spray of alkaline sorbent consisting of lime or limestone (primarily limestone) into the exhaust gas. The alkali reacts with the SO2 gas to form calcium sulfite (CaSO3) or calcium sulfate (CaSO4) that is collected in a liquid slurry form.