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AssigneeBioendev AB
InventorsIngemar Olofsson, Martin Nordwaeger, Erik Sandstrom, Linda Pommer, Anders Nordin
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The invention relates to 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oxygen reacts with components of the torrefaction gases under the formation of heat and wherein torrefaction gases are withdrawn from the torrefaction reactor at a second position of the torrefaction reactor and wherein the first position is located downstream of the second position in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 with the biomass transport and wherein the optionally predried biomass has a temperature of between 30° C. and 230° C., preferably between 50° C. and 200° C., most preferably between 60° C. and 180° C. when entering the torrefaction rector.
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oxygen reacts with components of the torrefaction gases under the formation of heat and wherein torrefaction gases are withdrawn from the torrefaction reactor at a second position of the torrefaction reactor and wherein the first position is located downstream of the second position in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., preferably between 50° C. and 200° C., preferably between 60° C. and 180° C. when entering the torrefaction rector.
A method for producing a pulverized torrefied biomass comprising the following steps:
A system for torrefaction of a biomass, comprising a torrefaction reactor for torrefying the biomass having a biomass inlet and a biomass outlet wherein biomass can be transported from the biomass inlet to the biomass outlet in a biomass transport direction during a torrefaction process, wherein the torrefaction reactor further comprises at least one gas inlet for injection of an oxygen containing gas to the reactor and wherein the gas inlet is connected to oxygen supply means for a controlled supply of an oxygen-containing gas to the torrefaction reactor and wherein the torrefaction reactor further comprises an outlet for torrefaction gases and wherein the outlet for torrefaction gases is located upstream of the gas inlet in relation to a biomass transport direction within the reactor and wherein the system further is comprising a source of the oxygen-containing gas, which source is connected to the oxygen supply means.
Dependencies are inferred from the claim text.