FIELD: gas industry.
SUBSTANCE: invention relates to a method and system for removing sulfur dioxide from raw gas stream. In the method, raw gas is pre-purified. Then, SO2 is absorbed from gas using absorbing medium. Wasted absorbing medium is regenerated. These technological stages are alternated with caustic processing in a pre-purification zone in case of extremely high SO2 content in raw gas flow. The system contains a pre-purification unit, an absorption unit and a regeneration unit. The system differs in that the pre-purification unit contains an inlet for an aqueous solution containing a strong base.
EFFECT: easy, economical and reliable method and plant for processing gas with various SO2 content.
6 cl, 4 dwg
