Patent ID: 9580665
Date: 2017-02-28
CPC Classifications: C10L,F23G,F26B,Y02E

Claim:
1. A method of torrefaction of an optionally predried biomass in a torrefaction reactor such that torrefied biomass and torrefaction gases are obtained, and wherein an oxygen-containing gas is supplied to the torrefaction reactor at a first position in the reactor such that oxygen reacts with components of the torrefaction gases under the formation of heat and wherein torrefaction gases are withdrawn from the torrefaction reactor at a second position of the torrefaction reactor and wherein the first position is located downstream of the second position in relation to a biomass transport direction in the torrefaction reactor such that the torrefaction gases moves through the torrefaction reactor countercurrent to the biomass transport and wherein the optionally predried biomass has a temperature of between 30° C. and 230° C. when entering the torrefaction rector.