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<DIV>wet chips... wet chips... wet chips</DIV>
<DIV>getting them to be dry chips is a real hurdel</DIV>
<DIV>yes darius its like Goldie locks’ double edged sword (if you follow)</DIV>
<DIV>try to use heat, and they catch fire... big problem</DIV>
<DIV>strap that fire waiting to happen to a 100k$ truck with 50 gallons of
diesel aboard.... real big problem.</DIV>
<DIV>it is of my mind that a motorized trommel is the way to go. If the
trommel is set with about a 15 degree down angle the chips will migrate from the
feed end (upper) toward the output end (lower) as it revolves.</DIV>
<DIV>The motor running it could be geared way down, and put on a timer such that
every hour it kicks on for a minute and makes one half revolution.</DIV>
<DIV>A long trommel would also give the opportunity create stages, such that the
first stage could have finer screen, the bin below this section would fill with
“fines” smaller than desired.</DIV>
<DIV>Then the next stage could be screened for the target chip size. with a bin
below.</DIV>
<DIV>The output end of the trommel could fall into a bin of larger than desired
chips, chunks, sticks.</DIV>
<DIV>My gasifier has not run in a few years because of a lack of dry chips, or
shall I say the mess and time and energy required to dry chips. I will
have more into fuel prep than I will have into the entire
gasifier/generator.</DIV>
<DIV>it is my belief that one needs to allow nature to remove the unwanted
water, because if you try to force the issue not only does the whole system
become net negative, but the risk of fire eventually becomes unmanageable.</DIV>
<DIV>Gotta flip the chip, and be cool about it.</DIV>
<DIV> </DIV>
<DIV>Luke Gardner</DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=darius_tamizi@hotmail.com
href="mailto:darius_tamizi@hotmail.com">darius_tamizi</A> </DIV>
<DIV><B>Sent:</B> Saturday, January 25, 2014 4:57 PM</DIV>
<DIV><B>To:</B> <A title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">Discussion of biomass
pyrolysis and gasification</A> </DIV>
<DIV><B>Cc:</B> <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV><B>Subject:</B> Re: [Gasification] Chip drying without pyrolysing; Biocoal
manufacture.</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV>Drying static rawwoodchip pile with heat is almost impossible.</DIV>
<DIV> </DIV>
<DIV>With temp lower than 150C, water vapor condense before leaving the
pile.</DIV>
<DIV> </DIV>
<DIV>With temp higher than 150C, you will get fire from the drychip at the
bottom</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV style="FONT-SIZE: 75%; COLOR: #575757">Terkirim dari Samsung
Mobile</DIV></DIV><BR><BR><BR>-------- Original message --------<BR>From: Doug
<Doug.Williams@orcon.net.nz> <BR>Date: 26/01/2014 03:12 (GMT+07:00)
<BR>To: Discussion of biomass pyrolysis and gasification
<gasification@lists.bioenergylists.org> <BR>Cc: Discussion of biomass
cooking stoves <stoves@lists.bioenergylists.org> <BR>Subject: Re:
[Gasification] Chip drying without pyrolysing; Biocoal manufacture.
<BR><BR><BR><BR>Hi Tom and Colleagues,<BR><BR>Having spent the first 9 years of
my "trade "life in transport engineering, your idea is sound but difficult to
put into practice. Chip trucks are tippers, so the exhaust would have to enter
the box via a flexible hinge at the rear of the body. Not impossible, but
difficult to organise as most exhausts exit vertically up the back of the cab.
You would then need a body floor that is probably perforated, or for trials
fitted with a piping system on top of the floor.<BR><BR>Having used exhausts a
lot over the years into drum driers, but not closely controlled to 300C, but
around 300C just the same, given enough time, the chip on the bottom starts to
cook, and you see this at a point when steam and blue smoke comes out the top.
This is much the same problem for any static pile, so introduces the need for
chip movement. Rotational drying is a known technology, but in the circumstances
that we might dry chips for gasification and whatever, I have often thought that
our primary sources of heat is slightly different in it's acquisition to those
of most commercially available dryers.<BR><BR>While we continue to seek easy
solutions and simplicity of design, the answers to these questions remain
complex for those charged with resolving the problems. The calculations may show
what might be possible, but it doesn't tell you how it's
achieved(:-)<BR><BR>Doug Williams,<BR>Fluidyne.<BR><BR><BR><BR><BR><BR>On Fri,
24 Jan 2014 08:27:58 -0500<BR>Tom Reed <tombreed2010@gmail.com>
wrote:<BR><BR>> <BR>> Here's a simple solution, and I hope someone will
try it before I need to. <BR>> <BR>> If you are transporting the
chips any distance by truck, 2/3 of the truck's fuel goes out the exhaust pipe
as heat, enough to dry a load of chips the truck is carrying. The
temperature of the exhaust is closer to 600C as it leaves the engine, too hot
for drying. But if air is aspirated into a side stream of exhaust the
ratio of exhaust heat to added air could be adjusted with a simple spring
thermostat to 300 C (or other as required) to "cook or cool" the wet chips
without overhearing them. There is plenty of exhaust pressure available
for the aspiration before the muffler, and the drying would muffle this side
stream as
well.<BR><BR>_______________________________________________<BR>Gasification
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