[Stoves] Fabricated Burn Barrel TLUDS

Sat Sep 29 15:08:23 CDT 2012

Crispin, Alex,

If my calculations are correct the burn rate for downdraft gasifiers is in
the order of 70-100 lb/ft2/hr (340-490 kg/m2/hr; 1688-2400 kW/m2) with a
high performer being about 140 lb/ft2/hr (65 kg/m2/hr; 3377 kW/m2).  So in
24 in diameter you can fire from 220-315 lb/hr (100-143 kg/hr), or up to 440
lb/hr (200 kg) dry (15% MC) fuel. 

What is the burn rate for a TLUD?

Tom 

From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin P-P
Sent: Saturday, September 29, 2012 7:20 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Fabricated Burn Barrel TLUDS

Dear Alex 

Do you have any clear idea of the burn rate? 

Thanks 

Crispin 

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> 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] 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> 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  

_______________________________________________
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
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)

_______________________________________________
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/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20120929/8333a99d/attachment.html>