Tom,
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"
Are you selling these? I can not locate them on the web or your site. Please
give a link.
Thanks,
Dan
On 2/21/2012 2:41 PM, Thomas Reed wrote:
Dear Anand and All:
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).
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.
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.
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.
I hope that farmers in particular will develop this method for converting waste biomass to
valuable charcoal fertilizer.
So no kiln needed.
Tom Reed
Thomas B Reed
On Feb 20, 2012, at 9:23 AM, Anand Karve <[email protected]
<mailto:[email protected]>> wrote:
Dear Darius,
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.
Yours
A.D.Karve
On Mon, Feb 20, 2012 at 9:17 PM, darius tamizi <[email protected]
<mailto:[email protected]>> wrote:
Dear Mr. Wu, Mr.Karve
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?
Regards,
Darius
----------------------------------------------------------------------------------------------------
Date: Mon, 20 Feb 2012 10:21:15 +0800
From: [email protected] <mailto:[email protected]>
To: [email protected]
<mailto:[email protected]>
Subject: Re: [Gasification] Active charcoal
Dear Darius,
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.
Yours
A.D.Karve
On Sat, Feb 18, 2012 at 11:01 PM, Darius <[email protected]
<mailto:[email protected]>> wrote:
Dear Dr. A.D. Karve
Charring material are rubber wood.
Could you tell me the detail process?
Regards,
Darius
On 2/18/2012 9:56 PM, Anand Karve wrote:
Dear Darius,
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.
Yours
A.D.Karve
On Sat, Feb 18, 2012 at 10:14 PM, Darius <[email protected]
<mailto:[email protected]>> wrote:
Dear all,
Is somebody there can help me to convert our char into active
charcoal?
Regards,
Darius
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology
Institute (ARTI)
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