[Stoves] Charcoal production, improved

[Michael J. Antal, Jr.]

Dear friends: as Yury hints below, a discussion of biomass carbonization
efficiencies in the context of charcoal yields is meaningless.  Some years
ago we compared the fixed-carbon yield of charcoal to the theoretical
limiting value as defined by thermochemical equilibrium calculations, and we
showed that for some feedstocks the fixed carbon yield can reach the
theoretical limit when carbonization is done under pressure.  Under these
circumstances, as much as 66% of the energy content of the biomass feed is
retained in the charcoal product, and a fair fraction of the remaining 33%
can be captured in a catalytic combustor.  Thus the fixed-carbon yield of a
process can furnish a good measure of carbonization efficiency.  However it
does not reflect ancillary energy inputs.  We have published numerous
articles in the archival literature on this subject that I am happy to share
with anyone who requests them.  These articles cannot be posted on the web
because it would be a violation of ACS copyright.

Best wishes to all, Michael.

Michael J. Antal, Jr.
Coral Industries Distinguished Professor of Renewable Energy Resources
Hawaii Natural Energy Institute
School of Ocean and Earth Science and Technology (SOEST)
1680 East-West Rd., POST 109
University of Hawaii at Manoa
Honolulu, HI 96822

Phone: 808/956-7267
Fax: 808/956-2336
http://www.hnei.hawaii.edu

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org]On Behalf Of ??ee ?aeaae?
Sent: Thursday, March 22, 2007 8:13 PM
To: stoves at listserv.repp.org
Subject: Re: [Stoves] Charcoal production, improved



Dear Chris ADAM,

We had personal correspondence and it seemed to me, that I have
explained a state of affairs honesty. I regret, that you offer your
technology as non-polluting and economical repeatedly. We spoke about a
real output of coal from wood. I think, you could look standard
scientific manuals before to announce an output of 40 %.
I regret
Dr. Yury Yudkevich, main technologist
"Bioenergy LLC"
http://www.repp.org/discussiongroups/resources/stoves/Yudkevitch/charcoal/

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