Abstract: A treatment of biomass comprises supplying biomass which contains an amount of moisture to a first treatment device of a torrefaction system where the biomass is heated to a torrefaction temperature and substantially completely dried by evaporating the moisture to form a torrefied biomass. The at least partially torrefied biomass is removed from the first treatment device after a first time period and transferred to a second treatment device where it is kept for a longer second time period.

Abstract: A treatment of biomass comprises supplying biomass which contains an amount of moisture to a torrefaction system. The biomass containing moisture is heated to a torrefaction temperature in the torrefaction system. The biomass containing moisture is substantially completely dried by evaporating the moisture and the dried biomass torrefies at least partially to form torrefied biomass. The torrefaction system comprises a first treatment device and a second treatment device. The biomass is heated to the torrefaction temperature in the first treatment device within a first time period. The at least partially torrefied biomass is removed from the first treatment device after the first time period and the biomass which has been removed from the first treatment device is transferred to the second treatment device.