Desulfurization and denitrification flue gas treatment device controlled by PLC

The utility model belongs to the technical field of comprehensive flue gas treatment. The utility model relates to a flue gas treatment device, in particular to a PLC-controlled desulfurization and denitrification flue gas treatment device. The device comprises a circulating water tank, a desulfurization tower, a denitration tower, a water washing tower and an electric demister, the circulating water tank is connected with water inlets of the desulfurization tower, the denitration tower and the water washing tower through water outlet pipes, and at least two purification spraying layers are arranged on the desulfurization tower, the denitration tower and the water washing tower at intervals from top to bottom; a water inlet pipe of each purification spraying layer of the desulfurization tower, the denitration tower and the water washing tower is communicated with a liquid collecting section at the lower part of the purification spraying layer through an independent circulating pipeline; wherein the bottom of