External circulation semi-dry type deacidifier

The utility model discloses an external circulation semi-dry deacidification device, which is composed of a boiler combustion tail gas flue and a dust collector connected with the boiler combustion tail gas flue. The flue is also provided with a mixed humidifier interface and can be connected with a mixed humidifier with the mixed humidifier interface, the mixed humidifier is connected with a digestion humidifier which is provided with a reactant distributor, a fluidization device is arranged in the mixed humidifier whose roof is connected with a cyclic ash channel, atomizing nozzles are respectively arranged in the digestion humidifier and the mixed humidifier, the inner flue is provided with a section regulation plate to combine a reactor. The utility model is suitable for processing the sulfur dioxide, hydrogen chloride and other harmful substances of tail gas in power plants, industrial boilers, papermaking, metallurgy, building materials, waste incineration and other industries.