System and method for drying and torrefaction
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United States of America Patent
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Apr 24, 2012
Grant Date -
Apr 8, 2010
app pub date -
Jun 15, 2009
filing date -
Oct 3, 2008
priority date (Note) -
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Abstract
A method and apparatus for torrefaction of water containing cellulosic materials is performed in an inert atmosphere. The cellulosic material is cascaded through the apparatus between a plurality of rotatable trays vertically stacked within multiple processing zones. Steam being generated from heating of the cellulosic material is recycled back to the apparatus to provide an inert atmosphere. The steam may be superheated in a heat exchanger. Exhaust from the torrefaction zone of the apparatus has some moisture and other volatiles removed prior to being reheated in a burner. The heated exhaust is used in the heat exchanger to superheat the recycled steam.
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