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<p><font face="DejaVu Serif">Another option has occurred to me for
single house size units. Turbines always lose efficiency as
they get smaller, with a higher surface/volume ratio. Since I'm
only looking for pressures in fractions of atmospheres, vane
pumps and/or rootes blowers might be more suitable. Could
regular injections of a solvent or cleaning solution prevent
excess tar build-up?</font></p>
<p><font face="DejaVu Serif">Bob</font><br>
</p>
<br>
<div class="moz-cite-prefix">On 17-01-03 01:39 PM, Bob Stuart wrote:<br>
</div>
<blockquote
cite="mid:bb6cebe6-2512-842f-4489-ffb429fa87fb@sasktel.net"
type="cite">
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<p><font face="DejaVu Serif">Thanks again. This has saved me a
lot of trial and error.<br>
</font></p>
<p><font face="DejaVu Serif">It sounds like I should try using
plenty of air to minimize CO content, preheated for secondary
combustion, and a cyclonic separator for the ash, probably
with another filter as well, perhaps electrostatic? Air
lubricated bearings seem wise as well. The impeller case
should open with the feed door, swinging a rotary wire brush
into contact with the turbo, angled to both clean and turn it
slowly. The magnet needs a strong enclosure to handle the
centrifugal force, and careful balancing. <br>
</font></p>
<p><font face="DejaVu Serif">As usual with gasifiers, price does
not go down well for a small-capacity rig, so solar may have
this beat for home use now. Maybe I've just dreamed up a good
way to get forced draft on a condensing stove using low-tech
impellers. I hope someone will find this inspiring for a
larger scale unit.</font></p>
<p><font face="DejaVu Serif">Bob<br>
</font></p>
<div class="moz-cite-prefix">On 17-01-03 12:06 PM, Doug wrote:<br>
</div>
<blockquote
cite="mid:9fc67084-4606-b388-4174-1a9ddb27ae56@gmail.com"
type="cite">Hi Bob, <br>
<br>
Coking is caused by the reversion of CO gas back to CO2 and
carbon soot, where-by the hot gas entering the turbo is over a
temperature of say 500C. If you were to first combust this gas
with air so that only CO2 hot gas drove the turbo, the problem
then becomes one of ash particle impaction onto the impeller
blades. Naturally you get heaps of waste heat, but the
practicalities of cleaning the impeller daily or after each
refueling is a real party pooper! The only safe way is to use
ceramic filter candles, expensive and needing compressed air to
pulse clean. <br>
<br>
Not sure maths is all that's required to make your idea work in
the way you perceive without adding energy. Steam and coke need
the high temperatures and pressures associated with turbo
operation, but in differing design application. I'm sure others
will offer you comment to develop this interesting concept. <br>
<br>
Doug Williams. <br>
<br>
<br>
<br>
On 03/01/17 12:56, Bob Stuart wrote: <br>
<br>
<blockquote type="cite">Thanks, Doug. <br>
<br>
I'd been worried about coking, so you have saved me a test
setback. Will a cyclonic separator upstream help? I've never
dealt with coking, so I don't even understand its
vulnerabilities. Would a good wire brushing with each new
load of fuel do the trick? That could be automated pretty
easily. <br>
<br>
All the ICEs have to deal with the power for a compression
stroke. I'll do the math on intake vs exhaust volume before
building, of course, to make sure the turbo efficiency is a
minor fraction of the equations. With a built-in air pump, a
condensing flue is easy to arrange, and it recaptures any heat
used to burn wet wood. Would the steam help clean coke? It
eats carbon in an ICE. <br>
<br>
From what I know about generators, a rapidly spinning magnet
is quite effective. Those little DC-DC voltage converters are
surprisingly small and efficient, running at very high
frequencies. <br>
<br>
Bob <br>
</blockquote>
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