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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Gasification [mailto:gasification-bounces@lists.bioenergylists.org]
<b>On Behalf Of </b>Bob Stuart<br>
<b>Sent:</b> Tuesday, January 03, 2017 11:40 PM<br>
<b>To:</b> Discussion of biomass pyrolysis and gasification<br>
<b>Subject:</b> Re: [Gasification] Solid Fuel Gas Turbine, was Re: Where is Everyone?<o:p></o:p></span></p>
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<p><span style="font-family:"DejaVu Serif","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?</span><o:p></o:p></p>
<p><span style="font-family:"DejaVu Serif","serif"">Bob</span><o:p></o:p></p>
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<p class="MsoNormal">On 17-01-03 01:39 PM, Bob Stuart wrote:<o:p></o:p></p>
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<p><span style="font-family:"DejaVu Serif","serif"">Thanks again. This has saved me a lot of trial and error.</span><o:p></o:p></p>
<p><span style="font-family:"DejaVu Serif","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. </span><o:p></o:p></p>
<p><span style="font-family:"DejaVu Serif","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.</span><o:p></o:p></p>
<p><span style="font-family:"DejaVu Serif","serif"">Bob</span><o:p></o:p></p>
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<p class="MsoNormal">On 17-01-03 12:06 PM, Doug wrote:<o:p></o:p></p>
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<p class="MsoNormal">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>
<br>
<o:p></o:p></p>
<p class="MsoNormal">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 <o:p></o:p></p>
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