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Tom,<br>
<br>
You said, "our brush saw attachment for chain saws will cut limbs up
to 2-1/2" in diameter as small as you want the charcoal pieces"<br>
<br>
Are you selling these? I can not locate them on the web or your
site. Please give a link.<br>
<br>
Thanks,<br>
<br>
Dan<br>
<br>
<br>
<br>
On 2/21/2012 2:41 PM, Thomas Reed wrote:
<blockquote
cite="mid:685D838B-2DF6-4FEC-B6E2-C06B134BF2E9@gmail.com"
type="cite">
<div>Dear Anand and All:</div>
<div><br>
</div>
<div>Depending on the type of charcoal needed, you don't need a
kiln at all. the biomass should have a moisture content less
than 20% and cut into small enough pieces so you can make a
reasonably dense pile. (If you have a pile of slash, resulting
from cutting a tree down, our brush saw attachment for chain
saws will cut limbs up to 2-1/2" in diameter as small as you
want the charcoal pieces).</div>
<div><br>
</div>
<div>If you make a pyramid of scrap biomass (sticks, twigs, chips,
pellets, cobs, ...) and light it ON TOP, the cellulose will form
a combustible gas, leaving about 20% charcoal from the lignin.
The top layer of charcoal will ignite the next layer, and each
layer. Until allis converted to charcoal, the rising
deoxygenated gases protecting the charcoal layers above. </div>
<div><br>
</div>
<div>If you put wet newspaper under the pile, when the last layer
is converted, the rising steam will quench the pile of charcoal.
I call this a CHARCOAL PYROPILE.</div>
<div><br>
</div>
<div>Depending on the moisture content of the biomass pile, the
temperature of the charcoal will reach 500-700C. I believe
HughMcLaughlin said it was partially activated, but I hope he'll
comment. </div>
<div><br>
</div>
<div>I hope that farmers in particular will develop this method
for converting waste biomass to valuable charcoal fertilizer.</div>
<div><br>
</div>
<div>So no kiln needed.</div>
<div><br>
</div>
<div>Tom Reed</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<br>
Thomas B Reed<span class="Apple-style-span"
style="-webkit-tap-highlight-color: rgba(26, 26, 26,
0.296875); -webkit-composition-fill-color: rgba(175, 192, 227,
0.230469); -webkit-composition-frame-color: rgba(77, 128, 180,
0.230469); "> </span>
<div><span class="Apple-style-span"
style="-webkit-tap-highlight-color: rgba(26, 26, 26,
0.292969); -webkit-composition-fill-color: rgba(175, 192,
227, 0.230469); -webkit-composition-frame-color: rgba(77,
128, 180, 0.230469);"><br>
</span></div>
</div>
<div><br>
On Feb 20, 2012, at 9:23 AM, Anand Karve <<a
moz-do-not-send="true" href="mailto:adkarve@gmail.com">adkarve@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div>Dear Darius,</div>
<div>if you want to char biomass, you must have a kiln for
charring it. The kilns are mainly of two types. In the oven
and retort kiln, the biomass is filled into a closed
vessel which is heated from outside. The pyrolysis gas
escapes through a vent in the vessel, leaving the charred
matter behind. The renaissance painters used to make their
charcoal sticks by using this process. Also Yuri Yudkevich
in Russia uses this type of a kiln for making charcoal on a
commercial scale. In the TLUD type of kin, which is
generally used by most others, the biomass is filled
into the kiln, which is open at the top and which also has
holes in the bottom for allowing fresh air into the kiln.
The biomass is ignited from the top, so that the
fire traverses downwards. The air needed for maintaining the
fire comes into the kiln through the holes at the base of
the kiln. It rises up and the oxygen in the air is consumed
by the burning biomass. Therefore this kiln is called the
Top Lit Up-Draft (TLUD) kiln. </div>
<div>Yours</div>
<div>A.D.Karve<br>
<br>
</div>
<div class="gmail_quote">On Mon, Feb 20, 2012 at 9:17 PM,
darius tamizi <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:darius_tamizi@hotmail.com">darius_tamizi@hotmail.com</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px
0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">
<div>
<div dir="ltr">Dear Mr. Wu, Mr.Karve<br>
<br>
Thank you very much for the paper and explantion. I
can undestand the theory, but I do not know how the
apparatus looks like (exp. Oven with N2) and how can I
do all the explanation without the apparatus. Could
you help me more about it?<br>
<br>
Regards,<br>
<br>
Darius<br>
<br>
<br>
<div>
<hr>
Date: Mon, 20 Feb 2012 10:21:15 +0800<br>
From: <a moz-do-not-send="true"
href="mailto:adkarve@gmail.com" target="_blank">adkarve@gmail.com</a><br>
To: <a moz-do-not-send="true"
href="mailto:gasification@lists.bioenergylists.org"
target="_blank">gasification@lists.bioenergylists.org</a><br>
Subject: Re: [Gasification] Active charcoal<br>
<br>
<div>Dear Darius,</div>
<div> Normally one needs relatively high
temperature to make active charcoal, but the
pretreatment with calcium chloride allows us to
make active charcoal even at relatively low
temperatures. We make charcoal from light biomass
like agricultural waste and use a TLUD type kiln.
You would have to conduct experiments using your
biomass and your process of charring to see
if this pretreatment works in your case or not. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
<div>On Sat, Feb 18, 2012 at 11:01 PM, Darius <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:darius_tamizi@hotmail.com"
target="_blank">darius_tamizi@hotmail.com</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT:rgb(204,204,204)
1px solid;PADDING-LEFT:1ex">
<div>Dear Dr. A.D. Karve<br>
<br>
Charring material are rubber wood.<br>
<br>
Could you tell me the detail process?<br>
<br>
Regards,<br>
<br>
Darius<br>
<br>
On 2/18/2012 9:56 PM, Anand Karve wrote:
<blockquote>
<div>Dear Darius,</div>
<div>what material are you charring? We make
our charcoal from leaves of sugarcane,
which are discarded during the process of
sugarcane harvest. By soaking the leaves
in 5% solution of calcium chloride, dying
them and then converting them into char in
a TLUD kiln gives us active charcoal. We
have not tested this process in the case
of woody material. Perhaps you can do this
experiment. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
<div>On Sat, Feb 18, 2012 at 10:14 PM,
Darius <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:darius_tamizi@hotmail.com"
target="_blank">darius_tamizi@hotmail.com</a>></span>
wrote:<br>
<blockquote
style="BORDER-LEFT:rgb(204,204,204) 1px
solid;PADDING-LEFT:1ex">
<div>Dear all,<br>
<br>
Is somebody there can help me to
convert our char into active charcoal?<br>
<br>
Regards,<br>
<br>
Darius<br>
<br>
<br>
Dr. A.D. Karve<br>
Trustee & Founder President,
Appropriate Rural Technology Institute
(ARTI)<br>
<br>
<br>
</div>
</blockquote>
</div>
<br>
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Trustee & Founder President, Appropriate Rural
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