METHOD FOR THE TORREFACTION OF LIGNOCELLULOSIC MATERIAL
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Jun 28, 2012
filing date -
Jun 28, 2011
priority date (Note) -
Abandoned
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Abstract
A method for torrefaction of lignocellulosic biomass comprising: continuously feeding the biomass to an upper inlet to the torrefaction reactor vessel such that the biomass material is deposited on an upper tray assembly of tray assemblies stacked vertically within the reactor; as the biomass moves over each tray assembly, heating and drying the biomass material with a non-oxidizing gas under a pressure of at least 3 bar gauge and at a temperature of at least 200° C.; cascading the biomass down through the trays by passing the biomass through an opening in each of the trays to deposit the biomass on the tray of the next lower tray assembly; discharging torrefied biomass from a lower outlet of the torrefaction reactor, and circulating gas extracted from the reactor vessel back to the reactor.
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