If referring to the removal of sulfur from fossil fuel fired combustion plant please see the item called F.G.D. (flue gas desulfurization). If referring to the reduction of sulfur content in carbon steel and stainless steel then this will normally be achieved in a ladle furnace, i.e. after the initial steel making process which will have occurred in the basic oxygen steel making process (B.O.S.)  At the ladle furnace desulfurization reagents such as lime, calcium carbide and magnesium. The reagents are usually injected into the liquid steel in powdered form carried in dense phase with a high pressure gas stream, usually nitrogen. Stirring using lance injected argon may be used to speed the reaction. The reactions and inert gas stirring cause the release of a significant quantity of hot metallic fumes. These must be drawn away using sophisticated hood designs able to perform well in various processing stages and cope with the harsh physical conditions. The collected fume is ducked away to a fume treatment plant which must be designed to deal with the conditions. The hot fume may need cooling by means of a heat exchange or by the addition of cooling (dilution) air. The AAF FabriPulse XLC with its off line cleaning and on line maintenance features makes an excellent choice for this challenging application