Patent ID: 8900415

Claim:
A unit adaptable for fluidized bed torrefaction and grinding of particles of biomass with a largest dimension in the range of 2 cm to 5 cm, said unit having a top and bottom and having a general shape of a sector having a) two substantially vertical walls (P 1 ), (P 2 ), joining at an angle (β) to each other, delimiting said sector, in the range of 30° to 360°; and b) at least one inclined wall (P 3 ) defining three zones: a lower zone (1) adjacent to the bottom of the unit provided with a fluidization means for fluidization of particles in the range of 2 mm to 5 mm in size, and provided with a grinder placed at the bottom of the unit within the lower zone; an intermediate zone (2) at an intermediate position between the top and bottom of the unit provided with a fluidization means for fluidization of particles in the range of 1 to 2 mm in size; an upper zone (3) adjacent to the top of the unit provided with a fluidization means for fluidization of particles less than 1 mm in size; a pipe ( 11 ) for introducing the particles to be treated reaching into the unit to the level of the intermediate zone ( 2 ), and the angle (α) of the wall (P 3 ) inclined with respect to the vertical being in the range of 30° to 60°.