Flue-gas desulfurization

Flue-Gas Desulfurization

Flue-gas desulfurization

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Flue gas desulfurization (FGD) is a technology used to remove sulfur dioxide (SO<sub>2</sub>) from the exhaust flue gases of fossil fuel power plants. Fossil fuel power plants burn coal or oil to produce steam for steam turbines, which in turn drive electricity generators.

Sulfur dioxide is one of the elements forming acid rain. Tall flue gas stacks disperse emissions by diluting the pollutants in ambient air and transporting them to other regions.

As stringent environmental regulations regarding SO<sub>2</sub> emissions have been enacted in many countries, SO<sub>2</sub> is now being removed from flue gases by a variety of methods. The below is among the common methods used:

For a typical coal-fired power station, FGD will remove 95 percent or more of the SO<sub>2</sub> in the flue gases.


Methods of removing sulphur dioxide from boiler and furnace exhaust gases have been studied for over 150 years. Early ideas for flue gas desulphurization were established in England around 1850.

With the construction of large scale power plants in...
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