[Stoves] air for gazification

[frank at compostlab.com]

Dear Martin and stovers,

<snip>
> My assume:
> -I expect for a normal 10cm diameter can to play with a power of 
> about 1kw
> (That is roughly: 1kw / 80square-centimetres) -To begin with 1/2 the 
> amount of the total burning air (I think or even hope, it will be 
> less for merely smoke making) In cifers: 1/2 of the total amount is: 
> 20 cubic feet of air per hour, that are 566.339 litres per hour, or 
> 9.439 litres per minute, or 157 millilitres per second.
> 
> - 10 litres per minute are in the upper range of a normal oxygen-rotameter
> in anaesthesia-equipment. Such a rotameter would fit.
> 
> - Transformed to the square-measure-unit 1 square-centimetre: 0.125 litres
> per minute.
 
So, if my calculations are correct, our goal is an air flow of ~2cm/sec that
will produce 0.22 BTU/cm2/sec at the surface where the primary burn takes
place. This is the estimated ideal air flow be it forced air from a fan or
heat convection? 

Can anyone give me the pressure produced from a computer fan? I have
compressed air but would like to simulate a computer fan blasting up the raw
fuel chamber to the primary. 

Thanks
Frank  






> 
> Let us have fun!
> 
> Best wishes!
> 
> Martin
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Kevin Chisholm [mailto:kchisholm at ca.inter.net]
> > Gesendet: Samstag, 9. Juni 2007 01:59
> > An: boll.bn at t-online.de
> > Betreff: Re: [Stoves] air for gazification
> > 
> > PERSONAL TOP SECRET INSIDER INFORMATION!!! :-)
> > 
> > Dear Martin
> > 
> > One cubic foot of air, under stoichiometric conditions will support
> > combustion that releases 100 BTU
> > 
> > If you want 1 kw in 1 hour, ie, 1 kwh, you have to liberate 3412 BTU
> > 
> > Therefore, you need, in theory, 34.12 cubic feet of air.
> > 
> > Be\cause of poor mixing, etc, you will probably need about 15% top 25%
> > excess. Say 20% excess, or say a total of roughly 40 cubic feet of air
> > per hour.
> > 
> > Now, roughly 1/2 should be blown in below the grate, as primary air, to
> > make gas, and the other half should be blown in above teh fuel, as
> > secondary air, to burn the gas to completion.
> > 
> > That will be our little secret!! :-)
> > 
> > Best wishes,
> > 
> > Kevin
> > 
> > Boll, Martin Dr. wrote:
> > > Dear all,
> > >
> > >
> > >
> > > where can I find a rough and ready-number, of the needed air (oxygen)
> > amount
> > > for e.g. the release of 1kw heat-making wood-gas-amount in a T-LUD-type
> > > burner?
> > >
> > > - I am aware that moisture will make differences.
> > >
> > > - How many litres air per minute?
> > >
> > >
> > >
> > > Regards
> > >
> > >
> > >
> > > Martin
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
> 
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--
Frank Shields
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