[Gasification] First run of passive draft (TLUD) gasifier stove successful

[Prof. S.C. Bhattacharya]

Before retirement from the Asian Institute of Technology (Thailand), two
stoves were developed under a Sida-funded regional project. The stoves are
briefly described below and their photographs are attached. The descriptions
and photographs and much more information on the prtoject can be found at
http://www.retsasia.ait.ac.th/photogallery.htm
Dissemination booklets giving design of some stoves are also abailable at
http://www.retsasia.ait.ac.th/booklets.htm. Information on stoves and
briquetting is available in the Technology packages on screw-press
briquetting machines and briquette-fired stoves.
The top-down burning stove is basically similar to the TLUD stove it seems.

--------------------
1) The Institutional Gasifier Stove (IGS-2) consists of five main parts: a
fuel storage hopper, reaction chamber, primary air inlet, combustion chamber
and a 2-pot support. Experimental results indicate an average efficiency of
17% with ricehusk briquettes (two-pot configuration), 27% with wood chips
and 22% with wood twigs as fuel. The stove appears to be promising for
community type cooking, particularly for institutional kitchens and
traditional cottage industries.

2) The top-down burning appears to be able to burn biomass with much less
smoke compared with conventional burning. In top-down concept, some kindling
is put at the top of the fuel bed and ignited. The fire moves progressively
down through the layers of the fuel. The main advantage of the top-down
concept is minimal smoking. The two-pot top-burning stove jointly developed
by the Institute of Energy, Vietnam and AIT, Thailand could use ricehusk
briquettes and wood chips/twigs as fuel.

S.C. Bhattacharya

On 3/14/07, Paul S. Anderson <psanders at ilstu.edu> wrote:
>
> Dear Jonathan,
>
> Congratulations on your successful TLUD efforts with natural draft!!!  I
> look
> forward to many discussions with you.
>
> I am cross-posting your message (below) to the Stoves Listserv which is
> where
> most of the discussion is conducted about gasifiers that are COOKSTOVE
> size.
>
> I met Tom Reed in the Spring of 2001 and ever since then I have been
> working on
> these TLUD stoves for both natural draft and forced air.
>
> You mentioned photos, but none arrive with the your message, so please
> send them
> directly to my email address.  I can picture in my mind a 5-gallon
> bucket with 2
> inches of 4 inch-diameter pipe coming out the top.  But you did not
> mention any
> grate or how you prepared your primary air inlet pipe.
>
> My main question is about how your device is creating draft that must
> sustain
> airflows for BOTH primary and secondary air.
>
> About my work with the natural draft TLUDs, here are some references:
>
> At this site there are comments by Tom Miles, but I pasted below the one
> paragraph that he wrote:
>
> http://listserv.repp.org/pipermail/stoves_listserv.repp.org/2005-August/001733.html
>
> Tom Miles wrote in August of 2005:
> When I arrived for a visit to the ETHOS/Aprovecho Stove camp wednesday
> afternoon the Dean of Stoves (Dean Still) was brimming with excitement
> about
> Paul Anderson's new natural draft gasifier stove. Fresh off the plane from
> Bolivia, Paul had built a natural draft gasifier stove that swept the
> competition in tests for water boiling, gaseous and particulate emissions.
> During the camp several stoves were subjected to tests with three
> parallell
> testing devices: the CEIHD (UC Berkeley) particle detector, Tami's (Uof
> Illinois at Urbana-Champaign) portable stove tester, and other gas
> analysers. Tami, Chris and David will provide the results and details.
> When
> I left that evening the mad scientists, David from CEIHD and Chris from U
> of
> Illinois, were still crunching the data but the place was buzzing with
> good
> words about the performance of the gasifier-without-a-fan. Congratulations
> Paul for coming so far since you first showed us your ideas at ETHOS 2003
> (January).
> ************************
>
> That natural draft TLUD won the Cat Pee Award for clean combustion, and
> the data
> are shown in the graphs as "TLUD" and "Paul's TLUD".  I subsequently
> named that
> style of stove as the "Champion Stove".  Some photos of the stove are at:
> http://www.bioenergylists.org/stovesdoc/ethos/2005camp/camps2005.htm
> especially see photos 28 - 32 plus views in some other photos.
>
> A presentation about TLUD advances was made at ETHOS 2006.  See
>
> http://bioenergylists.org/stovesdoc/ETHOS2006/Anderson/AndersonETHOS2006.pdf
>      specifically Slides 6 - 11 that give some dimensions.
>
> And most recently, Dr. Dale Andreatta presented these results at ETHOS
> 2007.
> A Report on Some Experiments with a Natural Draft Top-Lit Up Draft
> (TLUD) Stove
>
>
> http://www.vrac.iastate.edu/ethos/files/ethos2007/Sat_AM/Session_2/Andreatta%20TLUD%20presentation.ppt
>      It includes some photos plus data that show even cleaner emissions
> than
> what had been previously obtained.
>
> *************
> Jonathan, it is truly wonderful to have another person be serious about
> the TLUD
> technology.
>
> You mentioned the humanitarian objectives of the work on cookstoves.  Your
> enthusiasm and business background are certainly needed to help
> accomplish this
> effort.  I look forward to working with you on such efforts.
>
> Please note that from Friday noon, I will be on an 18 day trip to India to
> the
> PCIA meeting (Partnership for Clean Indoor Air).  My replies might be slow
> after Friday, and I do not want to loose and messages, but please
> resend if you
> do not get a reply in a reasonable time.
>
> Please tell us all about your next experiments!!!
>
> Paul
> --
> Paul S. Anderson, Ph.D., Geography professor - Emeritus
> Telephone:  USA-309-452-7072 (residence and office)
> Internet site:  www.ilstu.edu/~psanders
> For my gasifier stoves info, go to:
> http://bioenergylists.org/contributors#Paul_Anderson
>
>
> Quoting "Jonathan F. Pratt" <jonpratt76 at hotmail.com>:
>
> > I decided to share this with the list...
> >
> > Just this evening I finally got around to building myself a passive
> > draft woodgas stove.  I followed the same basic design as the other
> > woodgas stoves.  Tom Reed has said he has had difficulty with natural
> > draft prototypes.  He could never get any that were very clean
> > burning.
> >
> > The results on the first run for mine were extremely encouraging.
> > However, I used dry store bought woodchips.  But I got an extremely
> > clean burn and did not even smell smoke just a few feet from the unit.
> >
> > I kept thinking in my head how to get mass produced units for
> > humanitarian aid that can be shipped somewhat compactly in bulk.
> > This unit has no fan and no batteries to deal with.
> >
> > I built mine out of a 5 gal steel pail, and about a 2' section of
> > stove pipe.  The steel pails are stackable and can be shipped
> > compactly.  The stove pipe sections (from Home depot) can of course
> > be shipped stacked in bulk and easily put together into cyliners by
> > hand.  The only difficult part was cutting a hole out of the lid to
> > slip the stove pipe section into.  I'm sure some kind of hole punch
> > die can be made pretty easily to do this task much easier than I did
> > it with a jigsaw with metal cutting blade.  I used the circular disc
> > from cutting a hole in the lid as the bottom of the combustion
> > chamber, drilling a few holes into it and the bottom of the stove
> > pipe and using some steel wire to hold it onto the bottom of the pipe.
> >
> > I drilled all the air holes with a 1/4" bit.  All in all the
> > dimensions of this unit were very similar to the Phillips stove but
> > without the thermocouple powered fan and the fire tube is longer
> > extending down to only 2" from the bottom of the 5 gal pail.  I
> > painted both the combustion chamber and the inside of the steel pail
> > in black stove paint for durability.  The stove pipe (combustion
> > chamber extended above the lid about 2") I drilled airholes in the
> > pipe just below the lid.  The pipe itself extending beyond the lid
> > can be made to directly support a pot with a few extra brackets for
> > support and/or more holes drilled in the section that sticks out the
> > top of the lid for the flame to exit.
> >
> > I got a decent amount of draft from the unit as you can see in the
> > attached pictures.  It was very interesting to see a layer of
> > swirling smoke UNDER the flames.  Because of the smoke I couldn't
> > even see the woodchips underneith.  But as I said the flames consumed
> > all of the smoke and only very seldom would I see a small puff of
> > smoke escape the combustion chamber. Maybe I have had good luck with
> > this one because of the stove paint.
> >
> >
> > Best Wishes,
> >
> > Jonathan Pratt
> > President, iENERGY Inc.
> > www.woodgas-stove.com
> >
> >
> >
>
>
>
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-- 
Prof. S.C. Bhattacharya, Ph.D. (Cambridge, UK)
President, International Energy Initiative
164/6 Prince Anwar Shah Road
Lake Gardens (Opposite "Adhunika")
Kolkata 700045
India
Tel: 91-33-24228645; mobile: 91-9831476944