(57) A movable grate (50) is mounted on an upright pipe (36) is disposed within and spaced
above the bottom of an upright vessel (12,14) of a gasifier. A layer (54) of loose,
high heat resistant, ball-like elements is established on the grate (50). Biomass
is continuously charged into the vessel (12, 14) above the grate (50) and combusted
so as to form a char-bed of biomass immediately above the layer (54). Combustion-supporting
gas is introduced into the char-bed and drawn downwardly through the char-bed, the
layer (54) and the grate (50). The gas generated thereby is withdrawn from the vessel
(12, 14) below the grate (50) by means of a fan (72). The grate (50) is moved so as
to move the individual elements of the layer (54) and effect gravitational filtering
of char-coal particles from the char-bed. The char-bed is agitated and combustion-supporting
gas is introduced into the char-bed by the pipe (36) and the tubular branches (62,
64, 66).
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