[Gasification] Gasification Digest, Vol 2, Issue 22
Geoff Thomas IMAP
wind at iig.com.au
Tue Oct 19 15:16:33 CDT 2010
Hi Ken, if superheated steam is a replacement for a significant
portion of the incoming gas then the proportion of outgoing nitrogen
should be less, and significant oxygen provided by the incoming H20.
I guess the trick is to split the water before it or as it hits the
glowing carbon, so the carbon gets enough oxygen to continue "burning".
I wonder how hot the steam would need to be?
On 19/10/2010, at 6:14 PM, gasification-
request at lists.bioenergylists.org wrote:
> I'd also like to start a discussion about direct contact of the wood
> with the exhaust gas. A pre-processing reactor that cooks the chips a
> little batch at a time then dumps them into the main gasifier
> reactor, via
> auger feed. As you say a "just in time" pipeline flow of pre-cooked,
> heated reactants. Water can be added if necessary as steam.
> Clearly the wood will become torrified, and the exhaust gas stream
> drive off and purge the wood fuel of moisture and volatiles, whilst
> the temperature of the fuel considerably. There will also be an
> increase in
> fuel energy density.
> If diesel exhaust was used (I'm thinking of a dual fuel Lister being
> up on diesel to raise process heat and provide mechanical and
> power for starting up gasifier), this will contain between 8% and
> 17% unused
> oxygen, and around 80% nitrogen. Would the O2 be of sufficient
> quantity to
> cause partial oxidation of the fuel and possibly more heat?
> If the exhaust is from a woodgas engine - it will again be around 80%
> nitrogen, plus CO2 and CO. If this relatively inert hot gas is
> used to
> purge the woodfuel of all moisture and volatiles - is the resultant
> ever going to have sufficient combustible constituents that it could
> ignited in any sort of air fed burner - or is the nitrogen loading
> just too
> Thoughts appreciated,
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