US 2012/0073157 A1Published application

System for drying and torrefaction

AssigneeWyssmont Company Inc.

InventorsEdward Weisselberg, Joseph Bevacqua, Robert Borre

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Abstract

An 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.

Claims7

Dependent claims

An apparatus for the torrefaction of water-containing cellulosic material within an inert atmosphere, said apparatus comprising,

a material processing chamber having a plurality of processing zones adapted for processing water containing cellulosic material,
a plurality of material supports arranged within said processing zones for receiving cellulosic material cascading within said chamber,
said material processing chamber having a first outlet for the discharge of steam generated from processing the cellulosic material within said processing zones, and
at least one inlet for recycling at least a portion of said steam into said material processing chamber, whereby said steam at least partially provides an inert atmosphere within said material processing chamber.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 13/312,428Filed 6 Dec 2011
Priority: 3 Oct 2008
Published: 29 Mar 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

C10L 5/447
On vegetable substances: carbonized vegetable substances, e.g. charcoal, or produced by hydrothermal carbonization of biomass
C10L 9/083
By heat treatments, e.g. calcining: torrefaction
F26B 17/001
Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement: the…
F26B 23/022
Using combustion heating: incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the…

Family

Application61/195,092Us provisional application · filed 3 Oct 2008
Application12/456,427Division · filed 15 Jun 2009
Application13/312,428Division
US 2010/0083530 A1Published application
US 8,161,663 B2Related patent
US 8,266,812 B2Related patent
US 2012/0073157 A1This patent

From the US filing history. Foreign family members aren’t listed.

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