Common Problem

Limestone powder is mixed with water to prepare limestone slurry as absorbent, which is sprayed evenly inside the absorption tower. Flue gas containing sulfur dioxide flows upward and fully contacts with the falling slurry, and gaseous SO₂ dissolves and reacts with calcium carbonate in the liquid phase. Under the aeration of forced oxidation air, the intermediate sulfite products are further oxidized into stable calcium sulfate dihydrate. After dehydration and separation, high-purity gypsum by-product is obtained.

The whole process realizes efficient removal of sulfur dioxide with a desulfurization efficiency up to 95%–99%. After treatment, the flue gas is saturated with water vapor and prone to white smoke plume, so supporting facilities like wet electrostatic precipitators or magnetic dewhitening equipment are often equipped at the rear of the system. A large amount of industrial water is consumed during operation, and desulfurization wastewater will be produced for subsequent treatment.