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" <[email protected]
<mailto:[email protected]>> 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:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *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 <[email protected]
<mailto:[email protected]>> 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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