Appeal No. 96-1003
Application No. 08/115,791
This is an appeal from the final rejection of claims 12-
31. Claim 7, the other claim remaining in the present
application, stands withdrawn from consideration. Claim 12 is
illustrative:
12. A method of gasifying carbonaceous material in a
single fluidized bed reactor having: a lower part defining an
oxidation zone, and including a distribution plate; and an
upper part defining a reducing zone and including a gas
discharge opening; said method comprising the steps of
substantially continuously:
(a) introducing oxygen containing gas into the lower part
of the reactor through the distribution plate;
(b) introducing carbonaceous material to be gasified into
the reducing zone in the upper part of the reactor at a point
substantially free of oxygen, so that the carbonaceous
material is pyrolyzed to produce gases which flow through the
gas discharge opening;
(c) separating unreacted carbonaceous material from the
gas flowing through the gas discharge opening;
(d) returning the separated unreacted carbonaceous
material from step (c) to the oxidation zone below the point
of introduction of the carbonaceous material in step (b) so
that the unreacted carbonaceous material reacts with oxygen
introduced in step (a) to generate heat, CO and H O and to2 2
maintain a temperature of between 970-1200 degrees C in the
oxidizing zone;
(e) circulating a sufficient volume of inert particulate
material, entrained in gas within the reactor so as to carry
sufficient heat from the oxidizing zone into the reducing zone
to maintain the temperature in the reducing zone greater than
or equal to 900 degrees C to provide a high enough temperature
to effect the pyrolyzation of step (b), generated CO and H O2 2
and other gases passing upwardly with the circulating
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