Particle withdrawal from fluidized bed systems

Details Particle withdrawal from fluidized bed systems Particle withdrawal from fluidized bed systems

C - Chemistry, Metallurgy

10

J

48/8

C10J 3/56 (2006.01) B01J 8/00 (2006.01) F23C 10/18 (2006.01) F23C 10/24 (2006.01) F23C 10/28 (2006.01)

Patent

CA 1133257

ABSTRACT OF THE DISCLOSURE Method an apparatus for removing ash formed within, and accumulated at the lower portion of, a fluid- ized bed coal gasification reactor vessel. A supplemental fluidizing gas, at a temperature substantially less than the average fluidized bed combustion operating tempera- ture, is injected into the vessel and upwardly through the ash so as to form a discrete thermal interface region between the fluidized bed and the ash. The elevation of the interface region, which rises with ash accumulation, is monitored by a thermocouple and interrelated with a motor controlled outlet valve. When the interface rises above the temperature indicator, the valve is closed, or positioned at a minimum setting, when the interface drops to an elevation below that of the thermocouple.

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