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ECN publication
Detailed mapping of the mass and energy balance of a continuous biomass torrefaction plant
Published by: Publication date:
ECN Biomass & Energy Efficiency 11-3-2016
ECN report number: Document type:
ECN-W--16-007 Article (scientific)
Number of pages:

Published in: Biomass & Bioenergy (Elsevier), , 2016, Vol.89, p.67-77.

Biomass torrefaction was tested on pilot scale (50 kg h-1 throughput) for 3 types of wood: spruce, ash and willow at torrefaction temperatures of 250°C-265°C. Quantitative analysis of process streams was accomplished by utilising on- and off-line analytical methods. The data obtained from the pilot tests could be very well translated into large-scale operations. A theoretical overall thermal ef?ciency of 88e89% was calculated for a large-scale heat-integrated torrefaction process that uses wet woody feedstock containing a mass fraction of 45% moisture. These results show that a pilot plant is most suitable not only for exploration of (new) feedstocks but also for generating experimental data that provide valuable information for the design of full-scale plants. The detailed mapping of the mass and energy balances presented in this work can be used further as input for process optimisation, evaluation of commercial viability and techno-economic analyses which can further help in up-scaling and commercialisation of the torrefaction technology.

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