Carbon black tail gas boiler with hot air recirculation pipeline

The utility model relates to the technical field of carbon black tail gas boilers, in particular to a carbon black tail gas boiler with a hot air recirculation pipeline. In order to solve the problem that an air preheater in an existing carbon black tail gas boiler is prone to corrosion and blockage, the carbon black tail gas boiler with the hot air recirculation pipeline comprises a boiler burner, the air preheater and an air feeder, and an air outlet pipeline of the air feeder is communicated with an air inlet of the air preheater. An air inlet of the air preheater is communicated with an air inlet of the air blower, an air outlet of the air preheater is communicated with an air inlet of the boiler burner, the air outlet of the air preheater is further communicated with an air suction pipeline of the air blower through a hot air recirculation pipeline, and a cold air suction opening is formed in the air suction pipeline. The operation environment and the pipe wall temperature of the air preheater are improv