[Stoves] Nozzles for TLUDs Re: venturi system -ratios of air and gas?

Jock Gill jock at jockgill.com
Mon Jan 11 21:15:19 CST 2016



Jock Gill
P. O. Box 3
Peacham, VT 05862

google.com/+JockGill

Extract CO2 from the atmosphere!

> On Jan 11, 2016, at 8:47 PM, Julien Winter <winter.julien at gmail.com> wrote:
> 
> Hello Paul;
> 
> If I understand your description of Kevin Adair's burner, lowering an hourglass restriction to the level of a concentrator would directed secondary downward against the upward flow of the woodgas.  We would no longer have a cross current burner.  We would have a counter current burner.  A simple demonstration can be seen here:  https://youtu.be/RnVaHpLZg8U
> 
> If we have a counter current burner, then there would be good turbulent mixing of air and gas at the base of the gas flame.  That is where most of the work of the burner would be done.  
> 
> Research in Australia showed that when the aperture of a concentrator ring was reduced below 70% of the reactor area, the gasification rate started to decrease.  If an hourglass constriction functioned the same way (and since we have a counter current burner, the conditions are not the same) it could add some stability to the performance of a counter current burner.  In an open riser, a counter current burner can create a strong draft of primary air, and cause an excessive gasification rates.
> 
> I have measured soot deposits on pots when a using a concentrator ring that I did not see with more open burners.  However, a concentrator has sharp edges that can create turbulence and flame stress that may not occur with a smoother restriction, like an hourglass.
> 
> I will have more to say about counter current burners in a few days.
> 
> 
> Cheers,
> Julien.
> 
> 
> 
> -- 
> Julien Winter
> Cobourg, ON, CANADA
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