Hi Bob,
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.
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.
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.
Have you considered Stirling Engines as an option?
Doug Williams.
On 04/01/17 17:39, Bob Stuart wrote:
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?
Bob
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