Flue structure for improving tip peak capacity of thermal power generating unit

The invention discloses a flue structure for improving the tip peak capacity of a thermal power generating unit. The flue structure comprises a first induced draft fan outlet flue, a second induced draft fan outlet flue, a desulfurization inlet flue, a first arc-shaped flow guide plate, a second arc-shaped flow guide plate and a plane flow guide plate, a flow outlet of an outlet flue of the firstinduced draft fan is communicated with a first flow inlet of the desulfurization inlet flue, a flow outlet of an outlet flue of the second induced draft fan is communicated with a second flow inlet ofthe desulfurization inlet flue, the two flow inlets are arranged oppositely, and the center connecting line is perpendicular to the center line of the desulfurization inlet flue. One end of the firstarc-shaped guide plate is tangent to the incoming flow direction of an outlet flue of the first induced draft fan, and the other end of the first arc-shaped guide plate is tangent to the center linedirection of the desulfuriza