[Bioconversion] Veg Lister

[Paul Harris]

G'day All,

Of course you could add extra fuel flexibility by using anaerobic
digestion to handle readily biodegradable wastes and feed the biogas
into the Lister - if your wood chips got too wet/frozen you may well
have some wet wastes available. Just don't put the gasifier too close to
the digester!

I have had some discussion with out local Machinery Restorers Club about
putting up a display, at their museum, with a gasifier and a digester
and having the caption "Is this history or the future?"

All the best,
HOOROO

Ken Boak wrote:
> 
> Rex & list,
> 
> The conversion of the Lister to running on waste vegetable oil can be very
> simple, depending on the ambient temperature, an oil pre-heater coil is all
> that is needed.  Some enthusiasts also fit an automotive diesel glowplug
> into the head of the Lister, to electrically pre-heat the combustion
> chamber.
> 
> For dual fuel operation,  the flammable gas need only be introduced into the
> air intake through a mixing valve.  The induction stroke of the Lister will
> draw in roughly equal quantities of air and woodgas. There should be a link
> from the engine governor to the gas valve - such that the governor can
> control or restrict the quantity of gas, and also allow a positive gas
> shut-off.  The details of suitable gasifiers can be found on the woodgas
> sites, or a commercially available unit from Ankur Scientific - who's site
> gives some good technical background.
> 
> http://www.ankurscientific.com/
> 
> Some experimentation will be needed to get the optimum gas/air ratio.  As
> the gas is introduced, the engine governor will control the position of the
> fuel injection pump rack, and therby limit the quantity of veg oil injected
> in each stroke.  It should be possible to reduce the veg oil consumption to
> about 20%, just enough to provide pilot ignition and overcome the mechanical
> losses of the engine. On my engine, this is about 360ml of veg oil per hour.
> 
> The benefits of dual fuel, is that the engine can be started and run on veg
> oil alone,  and provide mechanical, electrical  and thermal energy for
> assisting the gasifier, until it is producing good quality gas.  I hope to
> use a spiral  electric stove element to assist the lighting of the gasifier,
> and a hot air gun makes an ideal controlable source of pre-heated air for
> ignition,  (I have previously lit barbeques using just a 1600W hot air gun).
> 
> I believe that the combination of the Lister and a wood chip gasifier, would
> make an ideal experimental combined heat and power system for domestic sized
> properties.  Wood chips are one of the cheapest fuel available, and if their
> calorific content can be efficiently used to produce both heat and power,
> then this will help offset the use of domestic fossil fuels and lower the
> carbon footprint of the domestic energy used.
> 
> Ken
> 
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-- 
Mr. Paul Harris
Faculty of Sciences, DP710
The  University of Adelaide, Roseworthy Campus, AUSTRALIA 5371
Ph    : +61 8 8303 7880
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