The Collaborative International Dictionary
Torrefaction \Tor`re*fac"tion\, n. [L. torrefacere,torrefactum,
to torrefy: cf. F. torr['e]faction. See Torrefy.]
The act or process of torrefying, or the state of being
torrefied.
--Bp. Hall.
Wiktionary
n. Drying or roasting; especially an anaerobic heat treatment to make wood waterproof.
Wikipedia
Torrefaction of biomass, e.g., wood or grain, is a mild form of pyrolysis at temperatures typically between 200 and 320 °C. Torrefaction changes biomass properties to provide a much better fuel quality for combustion and gasification applications. Torrefaction leads to a dry product with no biological activity like rotting. Torrefaction combined with densification leads to a very energy-dense fuel carrier of 20 to 21 GJ/ton lower heating value (LHV). Torrefaction makes the material undergo Maillard reactions.
Biomass can be an important energy source. However, nature provides a large diversity of biomass with varying characteristics. To create highly efficient biomass-to-energy chains, torrefaction of biomass in combination with densification ( pelletisation or briquetting) is a promising step to overcome logistic economics in large-scale sustainable energy solutions, i.e. make it easier to transport and store it. Pellets or briquets are lighter, drier and stable in storage as opposed to the biomass they are made of.
Usage examples of "torrefaction".
Cyrus Harding and Neb were taken into confidence, and the sailor suspected nothing during the whole time, necessarily somewhat long, which was required in order to dry the small leaves, chop them up, and subject them to a certain torrefaction on hot stones.
Harding and Neb were taken into confidence, and the sailor suspected nothing during the whole time, necessarily somewhat long, which was required in order to dry the small leaves, chop them up, and subject them to a certain torrefaction on hot stones.