Abstract: The present invention relates to a method and system for torrefaction of biomass and combustion of generated torrefaction gases. The torrefaction gases released from the biomass during the torrefaction reaction are withdrawn from the reactor and into a first burning zone. A secondary stream of air is introduced to the first burning zone to combust the torrefaction gases whereupon hot flue gases are obtained. Part of the hot flue gases are directed to a mixing unit. The rest of the hot flue gas is directed to a second burning zone for complete combustion of the flue gases. The fully combusted flue gases obtained in the second burning zone are directed to a heat recovery unit where the temperature of the flue gas is decreased. Part of the cold flue gases are directed to the mixing unit where it is mixed with the hot flue gases such that a stream of cooled flue gases is obtained. The stream of the cooled flue gases are diverted into the torrefaction reactor for direct heating of the biomass.

Abstract: The invention relates to a method and an arrangement for precise monitoring and control of torrefaction temperature, which enables accurate control of the quality and properties of the torrefied material. The method includes determining the surface temperature of the biomass in the torrefaction arrangement is using an IR-thermometer and hot nitrogen gas a purge gas.

Abstract: 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oxygen reacts with components of the torrefaction gases under the formation of heat and wherein torrefaction gases are withdrawn from the torrefaction reactor at a second position of the torrefaction reactor and wherein the first position is located downstream of the second position in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.

Abstract: The invention relates to a method and an arrangement for torrefaction of a biomass. Said method and arrangements allows for precise control of torrefaction temperature, which is crucial for accurate control of the quality and properties of the torrefied material.

Abstract: The invention relates to a method and a system for efficient torrefaction of a biomass. Said system comprises a first zone for heating of an optionally pre-dried biomass and an insulated second zone for torrefying the heated biomass. The second zone has an inlet being connected to an outlet of the first zone and means for withdrawing torrefied biomass arranged at the bottom of the second zone, such that the biomass can move downwards through the second zone by means of gravity. Means for heating are arranged at the first zone, but not at the second zone.

Abstract: 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.

Abstract: The invention relates to to a method and an arrangement for precise monitoring and control of torrefaction temperature, which enables accurate control of the quality and properties of the torrefied material. The method includes determining the surface temperature of the biomass in the torrefaction arrangement is using an IR-thermometer and hot nitrogen gas a purge gas.