Internship
Adana, Turkey
Internship in FGD ( Flue Gas Desulfurization ) Department.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.Methods;As stringent environmental regulations regarding SO2 emissions have been enacted in many countries, SO2 is now being removed from flue gases by a variety of methods. Below are 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 removes sulfur dioxide, nitrogen oxides and particulates from flue gases;*Dry sorbent injection systems.Basic principles;Most FGD systems employ two stages: one for fly ash removal and the other for SO2 removal. Attempts have been made to remove both the fly ash and SO2 in one scrubbing vessel. However, these systems experienced severe maintenance problems and low removal efficiency. In wet scrubbing systems, the flue gas normally passes first through a fly ash removal device, either an electrostatic precipitator or a wet scrubber, and then into the SO2-absorber. However, in dry injection or spray drying operations, the SO2 is first reacted with the sorbent, and then the flue gas passes through a particulate control device.Another important design consideration associated with wet FGD systems is that the flue gas exiting the absorber is saturated with water and still contains some SO2. These gases are highly corrosive to any downstream equipment such as fans, ducts, and stacks. Two methods that may minimize corrosion are: reheating the gases to above their dew point, or using materials of construction and designs that allow equipment to withstand the corrosive conditions.
