The wet flue gas desulphurization system is an efficient technology to remove sulfur dioxide from the exhaust gases produced by combustion of fossil fuel. This method relies on a slurry consisting of limestone ash and water to scavenge the sulfur compounds in flue gas. The chemical reaction which takes place between SO2 and limestone produces solid by-products that are easily disposed of or re-used elsewhere. The functions of the wet FGD system include not only the absorption SO2 but also oxidation to sulfate or removal from flue gas of solid materials such as dust particles (usually composed mainly of calcium sulfite and sulfate). The technology includes a absorption tank with spray tower, the slurry circulation system and gypsum dewatering facilities. The wet flue gas desulfurization system is widely used in coal-fired power plant, refinery and other industrial enterprises where sulfur emissions are a significant concern.