Stovers,
I again forward to you the excellent response by Paal Wendelbo. His
experiences are awesome and trump many declarations about grass and
straw as TLUD fuel.
1. Some TLUD-knowing stovers need to conduct re-confirmation
(verification) testing. I have confidence that those who have the
TLUDs known as Peko Pe, Champion, Mwoto, and Quad should be able to
replicate and report results. We also would like to know the results
from doing this in any of the other TLUDs and their variations. The
diameters of 160 mm and 180 mm are 6.3 to 7 inches, which is quite
typical of the residential-sized TLUDs.
2. I request some assistance for all of us to have access digitally to
the pictures and notes that Paal has from northern Uganda. The best
way is to have someone work with Paal to gather the items, and to have
them scanned and distributed at the Stoves Website, at drtlud.com and at
other sites. For this we need the following:
A. Paal to give us some indication of the amount of materials,
and perhaps some estimate of costs to do the digitizing in Norway.
B. Anyone in Norway who could assist with the preparations, etc.
C. Volunteers to cover the costs of the digitizing, etc. I
will contribute.
I hope that we see some action about this.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: psanders at ilstu.edu Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 8/25/2013 2:24 PM, Paal Wendelbo wrote:
>
> Dear Paul A
>
> It is more than 20 years ago I first made this tests with grass as
> fuel in a refugee camp in Malawi. Some refugees cleared a land and
> piled it up and put fire on it. A lot of smoke arise for hours around
> the whole area. I took 2kg grass and weeds of different types, made a
> Peko Pe from a 2o liters tin, stamped it round a 50mm stick in the
> middle and was boiling 3 liter of water for more than an hour without
> any smoke. All my notes from that time were lost so I can’t go into
> details. By I have tried it several times and it works later and it
> works.
>
> Grass and weeds can be stamped into a TLUD-ND with a draft hole in the
> middle. Straw, reeds and papyrus has to be cut in length of the
> combustion chamber and placed vertical and loose. The especial with
> grass and straw is it doesn’t collapse when flame is ended, and the
> pot comes close the glowing mass with high enough temperature for
> still cooking. The time of flame and glowing is almost the same. The
> diameter of the stoves 160 mm for straw and 180 mm for grass.
>
> I remember we used straw for melting aluminum for making pots and did
> some small scale blacksmithing with papyrus. A 10mm iron bar was
> yellow/white after few minutes into the glowing.
>
> I still have some pictures and d notes from North of Uganda, but not
> electronic, but they can be copied if some are interested. At that
> time there was very little attention to that type of work, mostly due
> to the charcoal business.
>
> With regards Paal W
>
> *From:* Paul Anderson <mailto:psanders at ilstu.edu>
> *Sent:* Saturday, August 24, 2013 8:23 PM
> *To:* Paal Wendelbo <mailto:paaw at online.no>
> *Cc:* janitha chandimal <mailto:janithjc at gmail.com> ; Discussion of
> biomass cooking stoves <mailto:stoves at lists.bioenergylists.org> ; Doc
> Anderson <mailto:psanders at ilstu.edu>
> *Subject:* Re: Grass Gasification
> Stovers,
>
> I am forwarding a message from Paal Wendelbo this is quite informative
> about pyrolysis of grass fuel in his Peko Pe. It should apply to
> all true TLUD stoves with full diameter access to the fuel chamber.
>
> I now ask Paal: Please discuss the "grasses". There are so many
> types. Do your comments / experiences relate to certain types (such
> as those with nice stiff stems, which species??) more than to other
> types of wavy / leafy grasses?
>
> Also, the diameter of you stove is important to get 1/2 kg in a bundle
> that is 20 cm tall. Did you have stoves with different diameters?
>
> Very important info you gave about difficulties when the grasses are
> simply packed in (not in bundles of vertical stems).
>
> Paul
> Paul S. Anderson, PhD aka "Dr TLUD"
> Email:psanders at ilstu.edu Skype: paultlud Phone: +1-309-452-7072
> Website:www.drtlud.com
> On 8/23/2013 3:09 AM, Paal Wendelbo wrote:
>>
>> Dear /Janitha Bandara///
>>
>> Thanks for mail. I can’t say I have done any gasification researches
>> for grasses, but In have done a lot of practical use of straw (
>> hyperrenia rufa) as fuel for household cooking in Uganda in 1995,
>> with the Peko Pe TLUIFD-ND stove. We found the best way to utilize
>> the straw was to cut it to the height of the stove, 200 mm, made it
>> into bundles of ½ a kg and put it into the stove. The bundles was
>> burning nicely without smoke for about 20 minutes on the flame and
>> another 20 minutes on the glowing since the glowing straw did not
>> collapse like other types of fuel.
>>
>> You have a nice clean flame on the generator, probably a bit too
>> high, depend what kind of use//it is designed for. I should like to
>> know more about the aim of the construction. Is it to produce gas or
>> to produce energy for something else?
>>
>> Regarding I insulation, be aware of higher temperature will strain
>> the metal in the combustion chamber, air could be better with double
>> function, cool down the temperature on the metal and the same time
>> preheat secondary air.
>>
>> If you stamp grass into the generatorto prolong the process, there
>> will be a problem of air going through, a 50 mm vertical channel in
>> the middle will solve the problem.
>>
>> With regards Paal W. paaw at online.no <mailto:paaw at online.no>
>> *From:* janitha chandimal <mailto:janithjc at gmail.com>
>> *Sent:* Wednesday, August 21, 2013 11:32 AM
>> *To:* paaw at online.no <mailto:paaw at online.no>
>> *Subject:* Grass Gasification
>> Dear sir, Pall Wendelbo,
>> I m writing this according to the information got from Paul Anderson,
>> Golden, Colorado and He said that you had done gasification
>> researches for grasses. Me too is doing my masters research on
>> gasification of guinea grass (Panicum maximum) and I have got some
>> fine results. It is a small scale system having 700 mm height and 200
>> mm in diameter. But the main problem involved is the quick exhaustion
>> of feed stock and the compaction of grass. I have here by attached my
>> drawing and few pics of the flame. looking forward to hear from you
>> soon. Thank you.
>> Best regards
>> --
>> */Janitha Bandara/*
>> /PG Student, Dept. of Chemical & Process Engineering, University of
>> Moratuwa, Sri Lanka/
>> /0094713058696/
>> //
>> /*Take Hands in Reducing Consumption, Saving Resources & Protecting
>> Environment*/
>
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