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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>
On 12/26/2011 12:43 PM, <a class="moz-txt-link-abbreviated" href="mailto:ktwu@itri.org.tw">ktwu@itri.org.tw</a> wrote:
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Dear Doug<br>
<br>
Thanks for the valuable information. <br>
<br>
In the Chinese language, the name of coke and char is the same,
called "Jiao Tan".<br>
<br>
In a recent paper, <br>
<br>
Hosokai, S., K., Norinaga, T. Kimura, M. Nakano, C.-Z. Li, and J.
Hayashi, "Reforming of Volatiles from the Biomass Pyrolysis over
Charcoal in a Sequence of Coke Deposition and Steam Gasification
of Coke," Energy Fuels, 25, 5387-5393 (2011),
<br>
<br>
the authors said "tar compounds are converted to <strong>coke</strong>
in the micropores of the
<strong>char</strong>" (see p. 5390). It is really confused for
me.<br>
<br>
Happy New Year<br>
<br>
KT<br>
from Taiwan<br>
<br>
________________________________________<br>
寄件者: <a class="moz-txt-link-abbreviated" href="mailto:gasification-bounces@lists.bioenergylists.org">gasification-bounces@lists.bioenergylists.org</a>
[<a class="moz-txt-link-abbreviated" href="mailto:gasification-bounces@lists.bioenergylists.org">gasification-bounces@lists.bioenergylists.org</a>] 代表 doug.williams
[<a class="moz-txt-link-abbreviated" href="mailto:Doug.Williams@orcon.net.nz">Doug.Williams@orcon.net.nz</a>]<br>
寄件日期: 2011年12月26日 上午 02:49<br>
收件者: Discussion of biomass pyrolysis and gasification<br>
主旨: Re: [Gasification] Coke and Char<br>
<br>
Hi KT,<br>
<br>
You ask some interesting questions:<br>
<br>
> What is difference between coke and char?<br>
<br>
I believe the problem of identification caused by the English
language. Coke is made in a retort from coal, and char is made in
a retort from biomass.<br>
<br>
Coke from coal and char from biomass?<br>
<br>
Others will give you a more academic answer.<br>
<br>
And what's about soot?<br>
<br>
I have only worked with soot made in high temperature gasification
systems 12-1500>C, and these were studied in 1978 here in New
Zealand by Dr J. Cousins. I wrote about these soot in 2008 for our
Fluidyne Archive
<a class="moz-txt-link-abbreviated" href="http://www.fluidynenz.250x.com">www.fluidynenz.250x.com</a><a class="moz-txt-link-rfc2396E" href="http://www.fluidynenz.250x.com"><http://www.fluidynenz.250x.com></a>
Scroll down the file list and you will find it 14 from the top.<br>
<br>
> According to Franklin's research in 1950s, she mentioned that
while the cokes could be graphitized by heat treatments above
about 2200 deg-C, the chars could not be transformed into
crystalline graphite, even at 3000 deg-C.<br>
<br>
If I offer a comment it will be conjecture, because the current
work being done on our soot and chars is new research, and not
published at this time. Having said that, it was these comments
that opened up the research, so may offer you a clue to follow
your interest.<br>
<br>
The soot of interest to me are those that form from volatiles in
the unstable chemistry of the sealed retort, which then pass down
through the upper boundary reduction zone,<br>
then the high temperature oxidation, before passing through the
reduction at 12-1500C. These are probably those seen in Dr Cousins
photos. The remaining char has none of these original volatile
carbons present, so no amount of heating will create a crystalline
graphite.<br>
<br>
Others can provide a qualified answer about coke from coal.<br>
<br>
I have a couple of photos that I used for the presentation of the
"Enigma of Gasification" at the Workshop following the IEA
Gasification Task Force Meeting in Christchurch in April 2011,
that show one of these soot (C57 O ) for the first time. I will
try to get these up on the Fluidyne Archive as soon as possible,
and advise accordingly<br>
<br>
Hope this may help.<br>
<br>
Doug Williams,<br>
Fluidyne Gasification.
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