[Gasification] Sawdust in Fan TLUD

[Rolf Uhle]

Art, 
this sounds very close to what I want to do and I cannot find it done!

I want to make pellets without having to pelletize.
After my very good experience with almond shells ( m/l 30 x 20 mm) passing 
readily through 3 and 3.5 " (75 and 90 mm) spiral augers and around bends,
I want to stamp wood chips on a rotating cilindrical die into " coins" of  
some 15 -20 mm diam.
I imagine some kind of hollow cylinder with holes and a matching, synchronized 
cylinder with short hardened steel punches stamping the chips thru those holes 
.
The stamped chips fall out of the hollow die and what has not been stamped 
runs around for another chance... 

Why does this machine not exist ?

Rolf




Am Samstag, 4. Juni 2011 21:19:26 schrieb 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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