Dear all,
Is somebody there can help me to convert our char into active charcoal?
Regards,
Darius
On 12/26/2011 12:43 PM, [email protected] wrote:
Dear Doug
Thanks for the valuable information.
In the Chinese language, the name of coke and char is the same, called
"Jiao Tan".
In a recent paper,
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),
the authors said "tar compounds are converted to *coke* in the
micropores of the *char*" (see p. 5390). It is really confused for me.
Happy New Year
KT
from Taiwan
________________________________________
???: [email protected]
[[email protected]] ?? doug.williams
[[email protected]]
????: 2011?12?26? ?? 02:49
???: Discussion of biomass pyrolysis and gasification
??: Re: [Gasification] Coke and Char
Hi KT,
You ask some interesting questions:
> What is difference between coke and char?
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.
Coke from coal and char from biomass?
Others will give you a more academic answer.
And what's about soot?
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 www.fluidynenz.250x.com<http://www.fluidynenz.250x.com>
Scroll down the file list and you will find it 14 from the top.
> 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.
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.
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,
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.
Others can provide a qualified answer about coke from coal.
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
Hope this may help.
Doug Williams,
Fluidyne Gasification. ??????????????,???????,????????????,????????
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