External circulation type flue gas wet desulphurization chimney

The invention discloses an external circulation type flue gas wet desulphurization chimney, and relates to the technical field of wet desulphurization, the external circulation type flue gas wet desulphurization chimney comprises a chimney main body, one side of the chimney main body is fixedly provided with a desulphurization liquid circulation box, and the chimney main body is internally and fixedly provided with a plurality of inner spraying pipes; the flue gas desulfurization device has the beneficial effects that in the using process, the exhaust fan is used for enabling flue gas entering the side flue gas pipeline from the flue gas inlet pipeline to enter the chimney main body at a high speed, and a limestone solution extracted from the desulfurization liquid circulating box is used for carrying out desulfurization reaction; a third liquid conveying pipe and a second liquid conveying pump are used for returning into the desulfurizing liquid circulating box, at the moment, the solution adsorbs more heat