[Gasification] Sawdust in Fan TLUD

[Art Krenzel]

Pete,
 
Have you looked into gear compression pelletizer?  Several years ago at the Port of the Tri Cities in Oregon, I saw a sawdust pelletizer made of two large gear wheels (about 18 inches in diameter) which were heavily spring loaded together and driven by a highly geared down electric motor.  I believe only one gear wheel was driven with the other acting as an idler.  They acted as a "nip roller" in the real world.  They formed a semi solid pellet about two inches long and about 5/8 inch in diameter.
 
Sawdust was augured to a hopper above where the gear wheels meshed and self fed into the gears.  The gear faces measured approximately two inches wide.
 
The pellets were not of the same high density as the extruder pelletizers make but if your purpose is only to use the straw on site, this might work for you.  They were handling the pellets with a bucket loader and auger.  Some of the pellets broke down in handling but the bulk of them remained in good shape.
 
It was simple, quiet and did not have a very large electric motor driving it.

Art Krenzel
 
 
> -----Original Message-----
> From: gasification-bounces at lists.bioenergylists.org
> [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Pete &
> Sheri
> Sent: Friday, June 03, 2011 9:01 AM
> To: 'Discussion of biomass pyrolysis and gasification'; 'Thomas Reed'
> Cc: 'Hugh McLaughlin'
> Subject: Re: [Gasification] Sawdust in Fan TLUD
> 
> Could one possibly semi-pelletize the sawdust directly at the input to the
> gasifier? I see pellet makers that use a screw extrusion method. If one
> could get enough compaction to loosely hold the particles together, right at
> the input point, then there wouldn't be the "spouting" discussed previously.
> There also wouldn't be all that pressurized air to deal with. The compacted
> material would also create a "seal" between the gasifier and the outside
> world, if needed.
> 
> Pete Stanaitis
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