[Stoves] Fabricated Burn Barrel TLUDS

Sat Sep 29 21:48:26 CDT 2012

Dear Alex,

I haven't carefully read the whole thread but haven't seen granularity 
of fuel addressed. Isn't that what makes a lot of difference in the 
flame/gas quality ( along with the moisture content, of course ) and 
determines the necessity of either using or not using forced air? 
Regarding Dr. Karve's drums I'm wondering how careful everyone is in 
emphasizing fuel moisture and particularity/uniformity issues in using 
these tools.

I think my first sentence above applies to both DD (Imberts or others) 
and TLUD's.

regards,
Ronald von der Oktoberfestnähe

(mein heutiger Name wird nur dann getragen bei einer 
Bierleichensichtungsrate von > 1 / Tag   ;-)  )

On 29.09.2012 20:55, Alex English wrote:
>
> Tom,
> I guess it may depend on what you consider a clean burn. My 
> experiments focused the gases through a smaller out let pipe and then 
> added the secondary  air. So for a two foot diameter drum the pipe was 
> three inches in diameter.   Air was introduced near the top having 
> only half that distance to penetrate, and combustion occurred in a six 
> inch diameter chimney , six feet tall above.
>
> Combustion was measurably good to very good nineteen times out of twenty.
>
> So, what indeed is the limit?
> Alex
>
> On 2012-09-29 11:47 AM, "Tom Miles" <tmiles at trmiles.com 
> <mailto:tmiles at trmiles.com>> wrote:
>
>     AD, Paul, Kobus and others. Many thanks for the suggestions.
>
>     What is the largest practical size (kg fuel/hr, kW) for a single
>     TLUD with a clean stack for heat recovery? There must be a limit
>     to the air penetration to get a clean gas burn form a natural
>     draft stack or even a fan driven TLUD.
>
>     Tom
>
>     *From:*stoves-bounces at lists.bioenergylists.org
>     <mailto:stoves-bounces at lists.bioenergylists.org>
>     [mailto:stoves-bounces at lists.bioenergylists.org
>     <mailto:stoves-bounces at lists.bioenergylists.org>] *On Behalf Of
>     *Anand Karve
>     *Sent:* Friday, September 28, 2012 11:22 PM
>     *To:* Discussion of biomass cooking stoves
>     *Subject:* Re: [Stoves] Fabricated Burn Barrel TLUDS
>
>     Dear Tom,
>
>     we regularly supply charring kilns made out of used 55 gallon
>     drums. The kilns are based on the TLUD principle. The cost of a
>     kiln plus an extra barrel for storing the char, is about
>     US$100. We have sold more than 100 such kilns in India and have
>     also trained a number of persons from India and Africa. These
>     kilns are so easy to manufacture, that we ask the trainees to
>     photograph and take measurements of our kiln so that they can copy
>     the design. In many instances, people buy a kiln from us, because
>     they feel that their local fabricator would be better able to copy
>     the design from an actual object than from a blue print or a
>     photograph.
>
>     The advantage of using 55 gallon drums is that used drums are
>     available at a relatively low cost, and the kilns are portable.
>     Instead of transporting the biomass, one transports the kiln to
>     the location where the biomass is available, and brings back only
>     the charred material, which weighs only a third as much as the
>     biomass.
>
>     Yours
>
>     A.D.Karve
>
>     On Fri, Sep 28, 2012 at 11:42 PM, Tom Miles <tmiles at trmiles.com
>     <mailto:tmiles at trmiles.com>> wrote:
>
>     Am often asked if there is a burn barrel sized TLUD that is
>     commercially fabricated. We’ve seen some great DIY with Doug’s
>     Jolly Roger and others. Is anyone fabricating a 55 gal drum sized
>     TLUD that can be used for regular biochar production? If so, what
>     is the cost and availability?
>
>     Thanks
>
>     Tom Miles
>
>
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>
>     -- 
>     ***
>     Dr. A.D. Karve
>     Trustee & Founder President, Appropriate Rural Technology
>     Institute (ARTI)
>
>
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