[Gasification] Where is Everyone? - wood stove turbo

[A6intruder@myo-p.com]

Bob,

 

That's a pretty interesting idea.  A couple of considerations based on my
experience adding a turbocharger to my v-8 1994 Mustang.  The turbine wheel
and compressor are pretty small in diameter (compressor impeller 3" or so in
diameter) on an automotive-type turbo.  I'm using a Holset HX-35W off  late
1990's diesel truck engine.  My 331 CID engine puts out well over 400 Hp at
12 psi boost.  At that data point this turbo is flowing around 1200 Kg/hr,
serious airflow.  You will go through a LOT of solid fuel in a VERY short
period of time.  The turbine/impeller are spinning around 100,000 RPM.  The
point being the impeller is very small place to put one or more magnets and
the RPM will demand very precise balancing.  Even just trying to run at a
couple psi boost you will be turning in excess of 55,000 RPM.

 

Even finding the very smallest of turbos out there you might get something
that only makes 100 Hp on an ICE but your magnet placement/balance problem
will more difficult, the smaller turbos REALLY spin!

 

I'm not trying to discourage the project.  You will be amazed at how small
and light those parts are when you open up a turbo.

 

Good luck with it!  Please keep us posted as the project progresses.

 

Dan Nicoson

 

 

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On
Behalf Of Bob Stuart
Sent: Monday, January 02, 2017 5:57 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Where is Everyone?

 

Thanks, Doug.

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.  

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.

>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.

Bob

On 17-01-02 05:15 PM, Doug wrote:

Hi Bob,

I have seen direct coupled car turbo's hooked to a pressurized
gasifier/stove, and in that situation, was fed hot gas straight out of the
gasifier. It's not that it doesn't work, just that it's almost impossible to
prevent the impeller from coking up and blocking. Not sure how you would
actually hook a generating device on this, but opportunity to develop that
hot gas to power directly would be a game changer. You also have to consider
the power demand required for air input compression.

Doug Williams.

 

On 03/01/17 11:34, Bob Stuart wrote:

Best Possible New Year, everyone.

I arrived here after a period with wood heat but no electricity at all, when
I got interested in steam.  Thanks to all for a great education on the
options.  I am hoping to find a new situation with younger people around
where I can use a gasifier.  What I'd like to try would be expensive if I
wanted maximum efficiency, but where the need for heat is high and power
modest, I think a great simplification might work.  

With a turbocharger from a car, I think it would be easy to just pressurize
an airtight stove to produce a solid-fuel gas turbine.  I presume that
sticking a magnet on the cold end would let a coil pull the power off.
Raising the pressure would get more efficiency, but drive up the bill for
exotic materials.

Best,

Bob Stuart,

Spiritwood, SK

 







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