[Stoves] Comments about T-LUDs

[Jeff Davis]

On Thursday 28 September 2006 10:21 am, Roger Samson wrote:
> I am not sure but think maybe the biggest limitation of T-Luds is the
> relatively modest energy conversion efficiency which limits the fuels we
> can use in them. It is great for wastes where you can recover the material
> as a carbonized soil amendment. However if we are making fuel pellets from
> dedicated biomass fuels then we need to burn the residual charcoal as fuel.

Dear Roger,

I have always found it interesting when Tom Reed writes that the inverted down 
draft gasifier will produce LESS (or maybe no) charcoal when the fuel is wet. 
The device/fuel will burn hotter also, maybe 900C wet and 750C dry. Because 
of that I have often wondered if wet fuel burning at about 900C would produce 
a more tar free gas than a dryer fuel at 750C. This would be opposite of a 
downdraft gasifier. Maybe dry fuel with steam injection?

A down draft gasifier will gasify charcoal and an inverted down draft gasifier 
is much like a down draft gasifier so I would think that by increasing the 
air blast of the inverted down draft gasifier that you could gasify your 
charcoal. But now you would have to be able to sense this and shift gears (so 
to speak) so this may not be practical.


Jeff




-- 
Jeff Davis
Somewhere 20 miles south of Lake Erie, USA
http://www.velocity.net/~jeff0124