Desulfurizing tower

The utility model discloses a desulfurizing tower which comprises a concentration section, an absorption section and a washing section which are sequentially arranged from bottom to top, and is characterized in that the absorption section comprises a first absorption section, a second absorption section and a third absorption section which are sequentially arranged from bottom to top so as to spray and desulfurize flue gas in a layered manner; spraying mechanisms are respectively arranged in the first absorption section, the second absorption section and the third absorption section, each spraying mechanism comprises a plurality of single-head nozzles and a plurality of double-head nozzles, the single-head nozzles are positioned on a first circumference, and the double-head nozzles are positioned on a second circumference; the first circumference and the second circumference are concentric, and the radius of the first circumference is larger than that of the second circumference, so that the coverage rate of