[Gasification] BRUSH ENERGY

Thomas Reed tombreed2010 at gmail.com
Tue Jun 7 06:06:13 CDT 2011


Dear Panniselvam

I'm glad to hear that Toplit updraft pyramids are used in your part of the world.  It is new here.

Tom Reed

Dr Thomas B Reed
President, The Biomass Energy Foundation
www.Woodgas.com

On Jun 5, 2011, at 9:30 PM, "Pannirselvam  P.V" <pannirbr at gmail.com> wrote:

> Helo Tom reed
> 
> In thailand  , India  the pile of such  sticks from  fast growing  bush into a dense pyramid and light a fire on the top layer, it behaves like the Toplit Updraft stove and burns down, pyrolysing the wood in each layer to make 15-20% charcoal .This is  what you correcly named  and call this pile a "Pyromid"  ( but this term has been used also for another product , i wish to call pyropyramid reactor; some are  covered  with saw dust  or sand 
> 
>  The Dalit , the poor  people  ,survive  from semi arid tropical   in south India perfected this natural  Top lift reactor well  as moisture  content even after drying is problems, they used  some combination of recycle of charcoal sticks  in this pile  as feed stocks;
> thus reducing the pyrolysis time , increasing the  overall charcoal yield  and reducing the  time , space liitle de they have ,
> Thus realy this simple pyropromids  are futher well done to recycle urban solid waste into charcoal in many cities 
> 
>  Yet these technolgy can be as altrenate to energy intensive  pellets , or chip making 
> 
>  yet all pyrogas are wasted  in this practicall easy pyro reactors, but can be recoverded  too by simple tecnology
> 
> Yours truely
> 
> Panniselvam P.V
> Brazil
> 
> 
> 
> 
> 
> On Sun, Jun 5, 2011 at 5:47 PM, Thomas Reed <tombreed2010 at gmail.com> wrote:
> There is almost as much energy or even more, in the brush of deciduous trees as in the main trunk. And every time you cut down a tree you get a big pile of brush which needs to be burned or hauled to the dump.
> 
> I have developed an attachment for chainsaws that will reduce a 5 foot tall pile of brush to a 1 foot pile of worth sticks in 15 minutes.  See it in action at
> 
> http://www.woodgas.com/brushsaw.htm
> 
> <><><>
> 
> When laying up a pile of brush for further cutting, put ratchet straps on the ground first, and use them to compress the pile by a factor of 2-3 and make the sticks and branches more parallel for cutting. It's easy to cut a pile into 1-3 foot long pieces to be used for burning or charcoal.
> 
> <><><>
> 
> If you pile these sticks into a dense pyramid and light a fire on the top layer, it behaves like the Toplit Updraft stove and burns down, pyrolysing the wood in each layer to make 15-20% charcoal.  I call this pile a "Pyromid"  ( but this term has been used also for another product).
> 
> Onward
> 
> Tom Reed, Pyrologist
> 
> 
> 
> Dr Thomas B Reed
> President, The Biomass Energy Foundation
> www.Woodgas.com
> 
> On Jun 4, 2011, at 7:14 PM, Rolf Uhle <energiesnaturals at gmx.de> wrote:
> 
> > I have pelletized and i know how it works.
> > It is o.k. as long as you have good clean sawdust at a reasonable price.
> >
> > The thing is most people don't !
> >
> > I make chips from brushwood and treetops at a reasonable price.
> > The chip quality is a bit mediocre, though and I want to refine it so as to
> > keep it from bridging. Cut the long bits short and make it look more round or
> > square, then it will flow !
> > I am happy with a density of 400 kg/m³ instead of 650 for pellets as long as i
> > don't have to ship them far away.
> >
> >
> > If torrefaction wasn't so expensive at small scale, it would be a good
> > solution.
> >
> > Rolf
> >
> >
> >
> >
> >
> >
> > Am Samstag, 4. Juni 2011 23:39:42 schrieb Art Krenzel:
> >> Rolf,
> >>
> >> I do not know why other machines like it were never made.  That was the
> >> only machine of that design I have ever seen.  I think the quality of the
> >> end product pellets did not make it through the long distance, multiple
> >> handling systems sufficiently well to meet the needs of the end user.
> >> They were sort of "heavily squished" rather than extruded with a melted
> >> lignin total outer coat.  This left the pellet much more susceptible to
> >> handling damage.  The process was operated in full recycle mode until the
> >> gears heated up before any product was made to facilitate the heat
> >> pressing of the sawdust.
> >>
> >> I would seriously review using a hollow cylinder with a piston to compress
> >> the sawdust.  It does not do well in the "rock in the sawdust" test.
> >> Most, if not all, pelletizing processes need alot of cleanup of the floor
> >> area with brooms and shovels used by minimum wage help.  This swept up
> >> material is normally added to the feed side of the system and could cause
> >> serious maintenance difficulties.  The gears were spring loaded and just
> >> bounced open sufficiently to pass any incompressible foreign matter.
> >>
> >> The gear pelletizer system was incredibly quiet.  The loudest noise came
> >> from the auger and the loader (when it was running).
> >>
> >> Art
> >>
> >>> From: energiesnaturals at gmx.de
> >>> To: gasification at lists.bioenergylists.org
> >>> Date: Sun, 5 Jun 2011 00:16:15 +0200
> >>> Subject: Re: [Gasification] Sawdust in Fan TLUD
> >>>
> >>> 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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> 
> -- 
> ************************************************
> P.V.PANNIRSELVAM
> ASSOCIATE . PROF.
> Research Group ,GPEC, Coordinator 
> Computer aided  Cost engineering
> 
> DEQ – Departamento de Engenharia Química
> CT – Centro de Tecnologia / UFRN, Lagoa Nova – Natal/RN
> Campus Universitário. CEP: 59.072-970
> North East,Brazil
> *******************************************
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