The invention relates to method for torrefaction of biomass material at low temperature comprising the steps of: - providing a finely divided biomass material, - feeding said finely divided biomass material to at least one heater (4) for drying and heating said biomass material, - feeding said dried biomass material to at least one rotating torrefaction reactor (10), said reactor being provided with a heated jacket (14) and in the circumferential direction regularly spaced internal cooling tubes (15), whereby said cooling tubes (15) are so arranged that at least some of them, during rotation of said at least one reactor, will be in contact with and cool the biomass material being torrefied. The invention relates also to an apparatus for carrying out the method.
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