C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
48/7
C10J 3/56 (2006.01)
Patent
CA 1300884
ABSTRACT OF THE DISCLOSURE: There are disclosed a process and a plant for gasifying biomass. The plant has a pressure vessel containing a hot fluidized sand bed. The bio-mass is pre-dried to a moisture content of from 10% to 35% by weight. A stream- free oxygen-containing gas is fed and distributed, through a grid system at the bottom of the hot sand bed, to hold the bed in a fluidized state and to form, in its lower portion, an oxygen-rich heat-forming combustion zone and, in its upper portion, a hydrogen-rich gas-forming pyrolysis zone. The pre-dried biomass is uninter- ruptedly fed in the pyrolysis zone at essentially the center of the hot fluidized bed, this center being deter- mined when the sand bed stands at rest. The fluidized bed is held at an operating temperature of 750 to 860° C under an operating pressure of 400kPa to 1750kPa by control- ling the feeding rate of the fluidized gas aswell as the feeding rate of the biomass. The gases and biomass residue-released from the hot fluidized bed are removed in a gas stream from the head space above the bed and sent to a primary cyclone which separates the useful gases from most of the biomass residue the latter being returned to the combustion zone of the bed. The gases and the biomass residue that have remained in the first cyclone are then moved into a second cyclone where the useful gases are collected and the biomass residue dis- carded.
545162
Black John W.
Gravel Guy
Hoareau Raynald
Enerkem Technologies Inc.
Robic
LandOfFree
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