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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Hi
Ken,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I’m
guessing that the I.C. exhaust must have a substantial H2O component, in
addition to CO and CO2. While it may be relatively small at I.C. exhaust
temperatures, once it has transferred its sensible heat to the feed stock, I
imagine that the exhaust gas must be close to saturation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Mark<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>
gasification-bounces@lists.bioenergylists.org
[mailto:gasification-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Ken
Boak<br>
<b>Sent:</b> Monday, October 18, 2010 11:55 PM<br>
<b>To:</b> Discussion of biomass pyrolysis and gasification<br>
<b>Subject:</b> Re: [Gasification] the most important thing (quite possibly)
> i've learned to date<o:p></o:p></span></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>Andy,<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>I'd also like to start a discussion
about direct contact of the wood chips 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, pre- heated reactants. Water can
be added if necessary as steam.<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>Clearly the wood will become
torrified, and the exhaust gas stream will drive off and purge the wood fuel of
moisture and volatiles, whilst raising the temperature of the fuel
considerably. There will also be an increase in fuel energy density.<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>If diesel exhaust was used (I'm
thinking of a dual fuel Lister being started up on diesel to raise process heat
and provide mechanical and electrical 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?<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>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 off-gas ever going to have sufficient combustible
constituents that it could be ignited in any sort of air fed burner - or is the
nitrogen loading just too high?<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>Thoughts appreciated,<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>Ken<o:p></o:p></p>
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<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'>On 19 October 2010 02:13, andy
schofield <<a href="mailto:scothebuilder@hotmail.com">scothebuilder@hotmail.com</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:4.0pt;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'>Jim,<br>
<br>
Pushing calories around in the DTU graphic model, I find moving
heat into the fuel is indeed the best use, for loose BTUs.<br>
In practice, heat transfer into wood is not easy because of limited
conduction and radiation, and zero convection in a mound of fuel.<br>
The GEK method is like stir-frying vegetables in a wok; forcing
convection. As each particle, contacts the walls of the pyrocoil; they cook.<br>
<br>
Someday I want to attempt direct contact of the wood with engine exhaust gas,
after solving a certain sealing problem. <br>
A "just in time" inventory of heated wood; roasted to perfection.<br>
It is a shovel ready project.<br>
<br>
Looking forward to your findings. <br>
<br>
Andy<br>
<br>
<br>
<br>
<br>
<br>
<br>
<o:p></o:p></p>
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