Torrefaction

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Basics

Torrefaction removes moisture and some volatiles from wood. Further heating leads to carbonization, which mobilizes more volatiles and changes the properties of some of the constituents (e.g. due to polymerization).
  • A mild form of Biomass Pyrolysis at temperatures typically between 200 and 320 °C
  • Produces mainly Tar , and Charcoal
  • Can clog vents etc if not accounted for in design
  • If intentionalc the calorific value of biomass can be greatly increased
  • Benefits are:
    • Higher energy density
    • More homogeneous composition
    • Hdrophobic behavior
    • Elimination of biological activity
    • Improved grindability.
    • Seems to be via coating the resulting char in the tar via it not being extracted/removed in the flue gas?

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