Fluidized bed boiler injection device

The utility model discloses a jet device of a fluidized bed boiler, which relates to the technical field of fluidized bed boilers and comprises a nozzle and a shell, a bent pipe is arranged on the lower portion of the shell, the nozzle is mounted at the bent pipe end inside the shell, a reducing agent solution conveying pipe is arranged at the bent pipe end on the outer side of the bottom of the shell, and the output end of the nozzle is connected with a jet pipe through a cross. High-temperature and high-flow-speed flue gas enters the shell through the inlet end of the shell, a reducing agent solution is conveyed to the nozzle through the bent pipe by the reducing agent solution conveying pipe, the nozzle performs preliminary spraying, the flue gas is subjected to first-step mixing in the shell in the injection pipe and is uniformly mixed in the diffusion pipe, and the other part of flue gas is uniformly mixed in the diffusion pipe along the outside of the diffusion pipe. Through dispersion of the diffusion