Circulation fluidized-bed furnace

The present invention provides a circulating fluidized bed furnace, comprising: a fluidized bed is supplied to the inside of the treated (D) of the flow (1) of exhaust gas (G) from the fluidized bed (1) is discharged solid-gas separation and collecting the solid component (S) of the cyclone (2), and is returned to said fluidized bed (1) in the solid component (S) of the cyclone (2) will be collected the return pipe (3), on the return pipe (3), the injector having an air blowing compressed air into the return pipe (E) (3) (22), (23) and other components, remove entrained block the return pipe above solid component (S) in (3) suppressing device. Such circulating fluidized bed furnace, the solid component can be suppressed blocking the return pipe (3) (S), and the flow medium (M) is reliably returned to the fluidized bed (1) by the process was (D) a stable and reliable flows for processing.