Process and device for fluidized bed torrefaction and grinding of a biomass feed for subsequent gasification or combustion

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 constituted by an envelope having a general shape of a sector having a) two substantially vertical walls (P1), (P2), joining at an angle (β) to each other, delimiting said sector being in the range of 30′ to 360°;

• and b) at least one inclined wall (P3) defining three zones, from bottom to top:
• a lower zone (1) 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 said zone;
• an intermediate zone (2) provided with a fluidization means for fluidization of particles in the range of 1 to 2 mm in size;
• an upper zone (3) provided with a fluidization means for fluidization of particles less than 1 mm in size;
• the 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 (P3) inclined with respect to the vertical being in the range of 30° to 60°.