Particle withdrawal from fluidized bed systems

Gas: heating and illuminating – Generators – Cupola

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48 77, 48 63, 48203, 48210, 414147, 422110, 422145, 110185, 110266, C10J 368

Patent

active

043091946

ABSTRACT:
Method and apparatus for removing ash formed within, and accumulated at the lower portion of, a fluidized bed coal gasification reactor vessel. A supplemental fluidizing gas, at a temperature substantially less than the average fluidized bed combustion operating temperature, 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 opens to allow removal of some of the ash, and the valve is closed, or positioned at a minimum setting, when the interface drops to an elevation below that of the thermocouple.

REFERENCES:
patent: 2118651 (1938-05-01), Macchi
patent: 2534051 (1950-12-01), Nelson
patent: 2557842 (1951-06-01), Ruthruff
patent: 2677604 (1954-05-01), Nelson
patent: 2985525 (1961-05-01), Bearer
patent: 3847563 (1974-11-01), Archer et al.
patent: 3981690 (1976-09-01), Chen et al.
Westinghouse Electric Corp., "Advanced Coal Gasification System for Electric Power Generation", 8/15/77.

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