[Stoves] [ Misuderstanding of TLUD stoves Re: Refuelable TLUD

[Thomas Reed]

Dear Paal and All

I think that Paal has missed the point of TLUDs.  When a pile of wood starts
burning at the bottom, most of the fuel will be pyrolysed as the heat passes
up through the bed and burned without mixing with air.

When the fire is lighted on TOP of the fuel, the volatiles burn, leaving a
layer of charcoal.  Enough of this charcoal will burn to insure drying and
ignition of the second layer, same, same, until all of the volatiles from
the whole charge have burned, leaving the charcoal behind.

Bottom lighting is char burning, volatiles escaping.
Top lighting is volatiles burning, charcoal preserved.

So TLUD is not connected to the fuel, but to the manner in which air meets
the fuel.

<><><>

Conventional downdraft gasification uses the draft of an engine to pull air
down through a charge of first wood, then charcoal, so can be thought of as
a Bottom Lit Downdraft instead of a Top Lit Updraft.  That is why I
originally called it an "inverted downdraft gasifier" back in 1985 when I
first ran it.

Words are important.

TOM REED
Pyrologist

On Mon, Mar 7, 2011 at 5:05 AM, Paal wendelbo <paaw at online.no> wrote:

>
>
> Stovers.
>
> As far I can see the name TLUD is connected to the fuel and the combustion,
> and can not be a name of a certain stove. LPG, alcohol and kerosene stoves
> are all TLUDs and can not be ignited from underneath Reeds, Andersons and
> Peko Pe will not be TLUDs if some drops of kerosene go through the fuel and
> ignite at the bottom. The Champion stove can even be ignited from
> underneath, which probably most user will  do if they don’t have access to
> kerosene since it is more simple. And if you ad some fuel during time of
> combustion, is no longer a TLUD.
>
>                 TLBM- NF and TLBM-FD could probably do, BM stand for
> biomass, then charcoal and woodstoves will be included in the family if fuel
> are ignited on top and the refilling is from underneath the glowing. .
>
>                 The Peko Pe was   originally called Multi Fuel Combustion
> System MFCS,
>
> due to the fact more  types of biomass fuel could be utilized.and there
> was no other way to ignite than on top
>
>
>
> With regards Paal W
>
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> Stoves mailing list
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
> Stoves at lists.bioenergylists.org
>
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
>


-- 
Dr. Thomas B. Reed
The Biomass Energy Foundation
The BioChar Engineering Corporation
www.WoodGas.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20110413/d81d6ee6/attachment.html>