Circulating fluidized bed boiler coal drop pipe anti-blocking system

The invention discloses a circulating fluidized bed boiler coal drop pipe anti-blocking system which comprises a vertically-arranged first coal drop pipe and an obliquely-arranged second coal drop pipe, the upper end of the first coal drop pipe is used for being connected with an outlet of a coal feeder, and the lower end of the first coal drop pipe communicates with the side wall of the second coal drop pipe. One end of the second coal drop pipe is installed on a furnace wall, an air cannon is installed at the other end of the second coal drop pipe, the second coal drop pipe is sleeved with a plurality of annular gas spray pipes, and each annular gas spray pipe communicates with the second coal drop pipe through a plurality of nozzles. The air cannon and each annular gas spray pipe are connected with a gas source. According to the circulating fluidized bed boiler coal drop pipe anti-blocking system, raw coal is not easy to dry and bond at the furnace inlet, so that the raw coal smoothly enters the hearth, an