Anti-blocking device for slag outlet of furnace bottom air distribution plate of biomass circulating bed boiler

The utility model relates to the technical field of air distribution plates at the bottom of a hearth, in particular to an anti-blocking device for a slag outlet of an air distribution plate at the bottom of a biomass circulating bed boiler, which can effectively prevent the slag outlet at the bottom of the hearth from being blocked, enable impurities to be discharged smoothly, ensure fluidization uniformity and prolong continuous operation time of the boiler. The anti-blocking device comprises air distribution plates which are arranged on the two sides in an inclined mode, a slag outlet is formed in the lowest inclined position of each air distribution plate and connected with a slag outlet pipe, and step-shaped air caps are installed on the air distribution plates, and is characterized in that an anti-blocking frame is installed at each slag outlet and comprises a lower ring and an upper ring, the upper ring and the lower ring are connected through vertical steel bars, the adjacent vertical steel bars are a