STAGED BIOMASS PYROLYSIS PROCESS AND APPARATUS
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United States of America Patent
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Issued Date -
Nov 17, 2011
app pub date -
May 11, 2010
filing date -
May 11, 2009
priority date (Note) -
Abandoned
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Abstract
A biomass pyrolysis process in which biomass feedstock particles (having a d5o mean particle size of at least 1 mm) are thermally treated substantially in the absence of oxygen to pyrolyse the biomass feedstock particles. The thermal treatment of the biomass feedstock particles includes a heat treatment drying step at a temperature in the range 100° C. to 250° C. Then, at a pre-pyrolysis heating location in a heat treatment system, the biomass feedstock particles are heated to a temperature in the range 280° C. to 350° C., held within the same temperature range for a time of at least 5 seconds and then moved from the pre-pyrolysis heating location to a pyrolysis heating location by a conveyor system for heating to a temperature above 350° C. for pyrolysis.
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