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<p>Hi Bob,</p>
<p>I doubt if roots blowers would work with all the heat involved.
They are oil lubricated, but as the carbon dust collects even from
dry cold gas, they eventually seize. Vane pumps are a different
matter if you can build one with high temperature capability. In
some respects, this is how the rotary Wankel engine works if you
add a spark ignition. <br>
</p>
<p>It's worth telling of how our Roots blower being used to draw gas
into pressurized storage in Canada stalled, then due to no none
return valve, was driven backwards until the pulley came off and
went through the metal siding of the building.</p>
<p>Greg Manning up in Canada, found that orange oil available in
many cleaning products is the best solvent for tar or carbon based
deposits. If you play with gasification, make sure your hand
cleaners are orange oil based, as it's the best you can use.</p>
<p>Have you considered Stirling Engines as an option?<br>
</p>
<p>Doug Williams.<br>
</p>
<br>
<div class="moz-cite-prefix">On 04/01/17 17:39, Bob Stuart wrote:<br>
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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>
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