[Stoves] The Art of Using Grass Bundles in TLUD Stoves

[Paal Wendelbo]

Dear Julien.
At a refugee camp in North of Uganda in 1995 we used straw as fuel for 
cooking with the Peko Pe TLUD-ND. The straw was cut in 8” length and made 
into bundles of ½ kg with a sisal rope.  The bundles were put into the 
combustion chamber vertical and the rope cut; easy to ignite on top and 
burning with smokeless flame with high temperature for about 20 minutes. The 
glowing mass did not collapse and was giving heat enough for simmering 
another 20 minutes.
Best regards Paal W.  For more information paaw at online.no

-----Opprinnelig melding----- 
From: Julien Winter
Sent: Tuesday, April 02, 2013 11:23 PM
To: stoves at lists.bioenergylists.org
Subject: [Stoves] The Art of Using Grass Bundles in TLUD Stoves

Hello stovers;

I have read with great interest about the Vetiver Grass bundles used
in Peko pe TLUD stoves in Haiti.
http://haitireconstruction.ning.com/page/tlud-grass-stoves
The reason for my interest is that I would like to use rice straw as a fuel.

Does anybody have experience with grass bundles to be able to answer a
few questions:

How big are the bundles relative to the TLUD chamber (e.g, 80% of the
horizontal cross sectional area)?
Do you place one big bundle in the TLUD or many small ones?
Are they stacked horizontally or vertically?

To my mind, this all relates to how the primary air flows in the TLUD.
If primary air flows around the outside of bundles, then is there a
possibility that the fire will just burn down the outside of the
bundles and go straight to the primary air inlets at the bottom of the
TLUD, bypassing much of the fuel?  If so, we will get a bottom fire
producing incombustible smoke.  I expect there is some art to using
these bundles.

Getting grass bundles to work in stoves is a great idea, because (for
me so far) loose straw is a smoky mess, and pelleting is too expensive
for many people.

Cheers,
Julien.

-- 
Julien Winter
Cobourg, ON, CANADA

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