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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 intentional the calorific value of biomass can be greatly increased
  • Benefits are:
    • Higher energy density
    • More homogeneous composition
    • Hydrophobic 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?
  • Along with the products of Hydrothermal Carbonization , it is often referred to informally as Bio-Coal given it's similarities to Bituminous Coal / Sub-Bituminous Coal ( Lignite / Brown Coal )

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