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What was the weight/nature of the feedstock?
Thanks
Geoff Beacon
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Geoff Beacon
geoff...@sent.com
----- Original message -----
From: "Nando M. Breiter" <na...@carbonzero.ch>
To: bio...@googlegroups.com
Date: Tue, 17 Aug 2010 14:25:08 +0200
Subject: Re: [Biochar] Efficacy of biochar as a carbon offset
Hi Dan,
I built this kiln.
In answer to your basic question, yes, carbon is offset, as long as the
offgases are flared and the feedstock scenario makes sense. I'm not
completely happy with the design as it stands, because the afterburner is
difficult to light and maintain burning (although this can be solved fairly
easily, it's just not as simple and straight forward as I would like it),
and energy is wasted in the one batch at a time approach. I built it for a
somewhat different purpose, to experiment with low temperature biochar in
our agricultural trials.
One should realize from the onset that once pyrolysis is complete, a barrel
will contain perhaps 20 kgs or less of char, which equates to about 20 x 0.8
x 3.66 = 58.5 kgs of CO2, if you use woody feedstock. If you utilize the
energy wisely to offset fossil fuel use you might be able to squeeze 100 kgs
of CO2 abatement out of each batch. Is that worthwhile?
There is a *lot* of excess energy in the gas that is released. Ideally, that
Kind regards,
Nando
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