METHOD AND ARRANGEMENT FOR EFFICIENT TORREFACTION OF BIOMASS Russian patent published in 2016 - IPC C10L5/44 C10L9/08 F26B23/00 

FIELD: wood-working industry.

SUBSTANCE: invention discloses a method for torrefaction of wood chips, comprising steps of: a) heating wood chips in at least one heating zone such that temperature of wood chips reaches a torrefaction temperature in range of 240-400 °C; and b) torrefying heated wood chips from step a) in a separate torrefaction zone by maintaining temperature within torrefaction temperature range, wherein heated wood chips from step a) are fed to torrefaction zone at its top, and torrefied material is withdrawn from torrefaction zone at its bottom, such that wood chips move downwards through torrefaction zone by means of gravity, wherein separate torrefaction zone is not externally heated; torrefaction temperature is controlled by measuring surface temperature of wood chips using a first infrared thermometer in upper part of torrefaction zone and a second infrared thermometer in lower part of torrefaction zone; and temperature is maintained within torrefaction temperature range by controlling amount of air or oxygen, fed into torrefaction zone. Also disclosed is a device for torrefaction of wood chips.

EFFECT: technical result is developing an energy-efficient torrefaction process, in which torrefaction temperature control is performed by feeding a controlled amount of air or oxygen into torrefaction zone.

12 cl, 4 dwg