Air distribution device of circulating fluidized bed boiler

The utility model relates to an air distribution device of a circulating fluidized bed boiler. The air distribution device comprises a hearth, an air distribution plate and a separator, an air distribution plate is mounted at the bottom of the hearth, and a primary air inlet is formed below the air distribution plate; the air distribution plate comprises two arc-shaped plates protruding upwards, and a slag discharging opening is formed between the arc-shaped plates and connected with a slag discharging vertical pipe. A separator is arranged on one side of the hearth, the separator is connected with the top of the hearth through a flue, and the bottom of the separator is connected with a material returning valve; and the material returning valve is connected with the hearth through a material returning pipe. The air distribution plate is composed of the two arc-shaped plates with the slag discharging opening in the middle, large sediments can be discharged from the slag discharging opening when the circulating