[Gasification] forced air for TLUDs

[Tom Reed]

Dear Robert

An excellent question below, and some good reasons for forced draft TLUDS.  

Certainly TLUDS can work usefully without electric power. 

However, the flame from a natural draft TLUD is tall and skinny and so you have incomplete combustion, quenched when a pot an inch or two away from the stove top  (since hot gases naturally rise).  Result:  you need more fuel and get soot bottomed pots.   

The battery allows you to have a horizontal disk of completely burned fuel.



similar to the disc of heat created by a premixed gas stove.  

So, at present, the 1.5 V battery makes a much cleaner and more efficient stove.

Good question, and I hope a good answer.

Tom Reed

Thomas B Reed 
280 Hardwick Rd
Barre, MA 01005

508 353 7841

On May 12, 2013, at 7:05 AM, Robert Fairchild <solarbobky at yahoo.com> wrote:

> 
> Why might we want forced air for a TLUD?
> 
> 
> 
> For primary air:
> 
> Higher power output (than natural draft)
> 
> Adequate power with tight packing fuels ( pellets, rice hulls, …)
> 
> 
> 
> For secondary air:
> 
> Higher power output (with forced primary air)
> 
> Improve cleanliness of combustion through better turbulence/mixing/air quantity
> 
> Reduce flame height to ensure more complete combustion, less soot/black carbon
> 
> 
> 
> Anything I've missed?
> 
> 
> 
>  Thanks,
> 
>  Bob
> 
> 
> 
> I am still thinking about venturis and enhanced natural draft secondary air flow.
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