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

摘要

A process and a unit for fluidized bed torrefaction and grinding of particles of a biomass with a largest dimension of 2 cm to 5 cm, and which unit contains an envelope having a general shape of a sector having a) two substantially vertical walls delimiting that sector; and b) at least one inclined wall defining three zones, from bottom to top: a lower zone provided with a fluidization means, and provided with a grinder placed at the bottom of that zone; an intermediate zone (2) provided with a fluidization means; and an upper zone (3) provided with a fluidization means; and a pipe (11) for introducing the particles reaching into the unit to the level of the intermediate zone.

主权项

1. 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 (P1), (P2), 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 (P3) 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 (P3) inclined with respect to the vertical being in the range of 30° to 60°.