| (57) A process for optimizing the ash separation and cooling operation of a fluidized
bed gasifier which produces a mixture of ash and char from a carbonaceous material,
comprising the steps of feeding the carbonaceous material to a gasifier at a first
rate, discharging the-mixture from the gasifier at a second rate approximately equal
to a rate of introduction of ash contained in the carbonaceous material fed into the
gasifier, maintaining the discharge temperature of the mixture below a temperature
T, injecting a first gas at a first elevation within the gasifier, injecting a second
gas at a second elevation which is above the first elevation to refluidize a portion
of the mixture, measuring the ash content of the discharged mixture, and measuring
sintering of ash of the discharged mixture; characterized by the further steps of
(1) raising the second gas injection elevation to increase the ash content of lowering
the second gas injection elevation to reduce sintering of the discharged ash, and
(2) repeating the above process until both ash content ,and sintering of ash of the
discharged mixture is acceptable.
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