Torrefaction is a process for the thermal pre-treatment of biomass and involves heating the biomass in a range between 200 - 300°C, in an inert atmosphere. The process occurs in two stages:
A typical biomass torrefaction process has four stages:
Benefits of Torrefaction of biomass over untreated biomass:
This technology produces sustainable alternatives to fossil fuels, thus reducing fossil carbon dioxide emissions. The torrefied biomass can be pressed into pellets to create a fuel with homogenous feeding and conversion properties.
Currently, EBRI is evaluating torrefaction mass and energy balances. This is part of EBRI's Supergen Bioenergy Hub project: Torrefaction integrated assessment. Data from previous research work will be used to develop full mass-energy balances for incorporation of torrefaction into selected bioenergy systems, including recovery of chemicals as part of an integrated processing scheme.
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