[Stoves] Wendlelbo's : Re Large TLUD --- TLUD Stove history

Anand Karve adkarve at gmail.com
Sun Aug 28 22:37:22 CDT 2011


Dear Stovers,
if you have a very simple stove with a grate at the base of the
firebox, you can eliminate almost all the smoke. The air coming
through the grate is the primary air and the air entering the firebox
through the fire mouth (the opening through which the wood sticks are
inserted) is the secondary air. The primary air causes the wood to
burn and the secondary air enters the flames to burn the volatiles. By
playing around with this simple configuration, we have designed a
stove that has become quite popular in the area where we operate. TLUD
works in a similar manner, but it suffers from the disadvantage that
one cannot add or reduce the fuel quantity, which is possible in our
stove. Rajan had some time ago reported a similar configuration, but
he made the system unnecessarily complicated by having the primary air
coming into the firebox through a tube. A simple grate is good enough.
Yours
A.D.Karve

On Mon, Aug 29, 2011 at 12:03 AM, Crispin Pemberton-Pigott
<crispinpigott at gmail.com> wrote:
> Dear Paul
>
>>...Those stoves only got that TLUD name in 2005, and were first named
> "Top-Lit UpDraft" in 2004 in the Anderson-Reed document at the LAMNET
> conference - found at the Stoves
> website).  From 1985 to 2005 Reed called the technology IDD, for
> Inverted DownDraft.)
>
> I am sure you are also aware that the natural draft TLUD method was being
> promoted at the municipal government level as the traditional smoke limiting
> method for the standard highveld mbaula quite some time ago.
> http://www.erc.uct.ac.za/jesa/volume17/17-2jesa-wentzel2.pdf
>
> I have no idea how far back the technique goes, but it was called 'lighting
> it like grandma does' which gives you a hint.
>
> I have attached a picture of an mbaula being lit using the technique,
> including the draft inducing upper pipe which both speeds the fire's
> development but also reduces smoke dramatically. It accomplishes the same
> things as adding a fan underneath with the added advantage of pulling air
> into the secondary air holes - something more difficult to achieve with a
> fan.
>
> The grate is about half-way up the lower can and the coal is on top. When
> the flaming pyrolysis is completed the top 'pipe' is removed. Tests by Vinny
> and James at the SeTAR Centre show about an 85-90% reduction in PM2.5.
>
> Maybe John Davies knows how long ago this style of TLUD ignition (and
> cooking) was used. As it is also called the 'Scotch method' it is likely to
> go back to England in the 1700's and was imported during the emigration boom
> post-1886.
>
> I have a colour photo of Fig 3 from Marlett's paper linked above if anyone
> want to see the fire more clearly.
>
> Regards
> Crispin
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> 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/
>
>
>



-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *




More information about the Stoves mailing list