Rotary cement kiln tail bypass exhaust air waste heat boiler

The utility model discloses a rotary cement kiln tail bypass exhaust air waste heat boiler which comprises a boiler steel frame. A front radiation cooling flue, a middle convection shaft flue and a tail convection shaft flue are arranged in the boiler steel frame, the three flues are connected through connecting flues, smoke settling chambers and ash removal openings are arranged at the bottoms of the three flues, a full-water-wall sealing structure is adopted by the front radiation cooling flue, a coarse pitch evaporation pipe bundle used for cooling smoke is arranged in the front radiation cooling flue, a slag blocking pipe is arranged at an inlet of the middle convection shaft flue, a superheater and a convection evaporation pipe bundle are sequentially arranged in the middle convection evaporation shaft flue from bottom to top, a convection evaporation pipe bundle and a coal economizer are sequentially arranged in the tail convection shaft flue from top to bottom, and heated components in the front radiat