Flue gas desulfurization tower

The invention discloses a flue gas desulfurization tower, which comprises a tower body; a circulating slurry pool, a sprinkler, a mechanical demister, and a wet type electric dust collector. A flue gas inlet is arranged on the tower body below the sprinkler, and a flue gas outlet is arranged at the top end of the tower body. The tower provided by the invention adopts combined wet type electric dust collection and wet desulfurization, employs limestone/lime or other alkaline materials (including ammonia water) as desulfurizer, can effectively solve the problem of NH3 escape existing in the ammonia desulfurization process, reduces secondary pollution, recovers absorbent, reduces ammonia consumption, can not only reduce stages of demisters in the device, but also remove liquid droplets of different particle sizes, PM2.5 fine dust and heavy metal mercury from flue gas, and captures various gases, such as SO3 and NH3, and existing in the form of aerosol in the flue gas.