> "Yes, a New Year is waiting for us, and our World is an unhappy place for > many. Celebrate as you can, and hope our differences draw us together, rather > than push us apart." > Amen to that Doug,
Thank you for all the work you've done over the last year. Your advice has been a great help. Henri Sent from my iPhone On Dec 26, 2011, at 12:45 AM, "doug.williams" <[email protected]> wrote: > > > Hi again KT, > > This must prove very difficult to understand: > > In the Chinese language, the name of coke and char is the same, called "Jiao > Tan". > > This proves that there is important information lost in translation to many > researchers. > > 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), > > I haven't read this paper. > > the authors said "tar compounds are converted to coke in the micropores of > the char" (see p. 5390). It is really confused for me. > > To me, the term coke as applied to pyrolysis gas from biomass, refers to the > tars that cook and dry out in the absence of oxygen. The moisture has gone > leaving only the carbons which are porous. We see it in gasifiers in packed > carbon beds that are not moving, or areas that allow leakage of the pyrolysis > gases to by-pass the oxidation zones. > > As the paper refers to steam gasification, one might expect to see coke form > in the microspores of the char, as there is a lot of carbon molecules > swapping places, and this endothermic reaction probably helps to "freeze" the > coke in the char, instead of converting it to gas. Having said that, there > are many possible explanations, and it would be necessary to see exactly how > these tests were done. > > Happy New Year > > Yes, a New Year is waiting for us, and our World is an unhappy place for > many. Celebrate as you can, and hope our differences draw us together, rather > than push us apart. > > Doug Williams. > Fluidyne. > > > _______________________________________________ > Gasification mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/
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