Patent ID: 7159522

Claim:
An incombustible withdrawing system for withdrawing an incombustible from a fluidized-bed furnace when a fluidized bed is formed therein by a fluidized medium, said withdrawing system comprising: a mixture delivery path to deliver a mixture of the fluidized medium and the incombustible from a bottom of the fluidized-bed furnace, a fluidized-bed separating chamber disposed downstream of said mixture delivery path to fluidize the mixture by a fluidizing gas, and to separate the mixture into a first separated mixture having a high concentration of the fluidized medium and a second separated mixture having a high concentration of the incombustible; a return passage to return the first separated mixture to the fluidized-bed furnace; an incombustible discharge passage to discharge the second separated mixture to an exterior of the fluidized-bed furnace; and a fluidized medium delivering device within said incombustible discharge passage, such that said incombustible discharge passage is to discharge the second separated mixture to the exterior of the fluidized-bed furnace by having the second separated mixture be delivered non-vertically upwardly in said incombustible discharge passage by said fluidized medium delivering device, and then discharged from said incombustible discharge passage, at a position higher than a surface of the fluidized bed when formed in the fluidized-bed furnace, to the exterior of the fluidized-bed furnace.