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<DIV>DD - A number of years ago I described a retort system
similar to this based on small experiments I did with a 20 lb propane cylinder.
Like Yury, in my plans, I had three 100 lb propane cylinder retorts,
feeding a central gas burner tube. The whole thing sat inside an insulated 275
gallon heating oil tank. The whole thing pivoted to unload and rotate the chips
and sticks used as feedstock. A small fire lit under the first cylinder got the
thing started. As the process finished, the kiln was rotated and each
cylinder and dumped into a quenching can, then refilled in the upright
position. Each kin had a pressure tight lid and the process would operate
under slight pressure adding to the carbon output. Operated by one man, it
would continuously produce char. </DIV>
<DIV> </DIV>
<DIV> I wanted to demonstrate it for Southern Ohio
farmers. They could turn fence row and overgrown pasture burn off wood into
an industrial fuel. Ten years ago nobody was excited about it because they had
downdraft carbonizers. What did they need with retort char? </DIV>
<DIV> </DIV>
<DIV> Dan Dimiduk </DIV>
<DIV> </DIV>
<DIV> Owner: Carefree Landscape</DIV>
<DIV> Founder: Shangri- La Research. </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/31/2013 4:39:56 A.M. Eastern Daylight Time,
ajheggie@gmail.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>[Default] On Fri, 31 May 2013 00:30:27 -0400,"David G.
LeVine"<BR><dlevine@speakeasy.net> wrote:<BR><BR>>Let me start with
"This is something I think I remember seeing."<BR>><BR>>Given a mass of
biological matter (no, I don't care if it is twigs, <BR>>grass or tree
stumps), put it in a horizontal 55 gallon drum with a band <BR>>clamped
head and a pipe from the top of the head down and under the drum <BR>>with
holes in the pipe which is parallel to the drum. Once filled
<BR>>(maybe not full either), a fire is started with scraps until the
gasses <BR>>coming out of the pipe burn. This means the heating
becomes self <BR>>sustaining and the carbon is unlikely to be vaporized,
but the gasses <BR>>driven off are used, not wasted. Suddenly the
pollution is reduced and <BR>>the efficiency goes up.<BR>><BR>>1.
Does this ring a bell in anyone else's mind?<BR>><BR>>2. Does this sound
like a viable approach?<BR><BR>Yes it's the system originally developed by
Lurgi for coal pre WW2 and<BR>has been revived many times, in England Robbie
Webster promoted it<BR>about 10 years ago and I suspect the Adam Retort uses a
similar<BR>feedback path. The limitation is the poor surface area through
which<BR>the heat can pass, not a big problem with dry wood.<BR><BR>It is
viable but think of the timeline of how pyrolysis develops, the<BR>offgas does
not evolve evenly and its calorific value changes during<BR>the process, this
tends to mean most of the heat from the offgas is<BR>happening after the main
charge is carbonised. Yury Yudkevitch<BR>addressed this problem by having a
series of cylinder retorts feeding<BR>a central offgas manifold which then
heated the "oven" space in which<BR>the cylinders sat, removing cyclinc=ders
and replacing with fresh in a<BR>batch
sequence.<BR><BR>AJH<BR><BR>_______________________________________________<BR>Stoves
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