Flue gas treatment system

The utility model relates to a flue gas treatment system. The flue gas treatment system comprises a desulfurization reaction tower, a dust remover and a circulating box, the desulfurization reaction tower is provided with a flue gas inlet, a flue gas outlet and a circulating feed port, the dust remover is connected with the flue gas outlet through a pipeline, an ash outlet of the dust remover is connected with the circulating box, and the circulating box is connected with the circulating feed port through an inclined articulated chute; and the pipe wall of the lower side of the elephant trunk is provided with an air tap which blows air towards the inner cavity of the elephant trunk so as to fluidize the reactant slipping in the elephant trunk and prevent the reactant from being bonded on the pipe wall. According to the flue gas treatment system disclosed by the utility model, high-pressure gas can be blown into the elephant trunk by arranging the gas nozzle, so that a reactant can be blown away by airflow and