Todd,
I interpreted the question as being about additional fuel being available under the pyrolytic front.
TLUD stoves that can have additional fuel placed on TOP of the created charcoal do certainly exist. Essentially the added fuel is being “retorted” by being heated in the absence of any oxygen. Quite different from the O2-present pyrolysis at the TLUD pyrolytic front. I have not been a fan of adding fuel on the top, but let the user decide if she / he wants to be frequently available to drop in more fuel and to have the associate variability of the resultant gases to be burned.
Paul
Doc / Dr TLUD / Paul S. Anderson, PhD
Exec. Dir. of Juntos Energy Solutions NFP
Email: psanders@ilstu.edu<mailto:psanders@ilstu.edu> Skype: paultlud
Phone: Office: 309-452-7072 Mobile: 309-531-4434
Website: www.drtlud.com<www.drtlud.com>
From: Stoves <stoves-bounces@lists.bioenergylists.org> On Behalf Of Todd Albi
Sent: Tuesday, September 18, 2018 12:27 PM
To: Discussion of biomass cooking stoves <stoves@lists.bioenergylists.org>
Subject: Re: [Stoves] TLUD Design Bachelor Theisis
Paul:
Interesting, your responses to # 3 & 5. We all are aware TLUD’s can be re-fueled while burning, by lifting pot. If you meant without lifting pot with some TLUD’s your assumption is somewhat more accurate, however there are numerous TLUD’s commercially available with both additional side feeds and inclined side feeds available to re-fuel stove while burning without lifting pot. Sold one Yesterday. Here are 2 videos below of such commercially available TLUD’s we offer and there are others. We sell several models that can be fed fuel with out removing pot while burning.
https://www.youtube.com/watch?time_continue=61&v=sacsVGb1Qg0
https://www.youtube.com/watch?time_continue=10&v=pII6wdKyuV0
We have a 1 meter tall fan TLUD that is very stable and extremely powerful, however do to safety issues with ignition we did not continue unit to production. It was stable as a platform for cooking and during operation. Complete and even combustion of fuel in a tall cylinder were the problematic variables. We experienced erratic combustion and it required precise top lighting that we ultimately decided was too problematic for general population.
Todd Albi, SilverFire
On Tue, Sep 18, 2018 at 9:44 AM, Anderson, Paul <psanders@ilstu.edu<mailto:psanders@ilstu.edu>> wrote:
Dear Hans-Christian,
Thanks for writing. Because it is a general request, I sending this reply to TLUD stove developers who are on the Stoves Listserv (which you could consider joining). Others have some answers that are beyond my knowledge, and they can write to you directly (maybe with copy to the Stoves Listserv to which you are not yet subscribed).
See reply below
> —–Original Message—–
> From: Hans-Christian Schomburg <hans-christian.schomburg@st.ovgu.de<mailto:hans-christian.schomburg@st.ovgu.de>>
> Sent: Tuesday, September 18, 2018 9:16 AM
> To: Anderson, Paul <psanders@ilstu.edu<mailto:psanders@ilstu.edu>>
> Subject: TLUD Design Bachelor Theisis
>
> Dear Dr. Anderson,
>
> In reference to your paper “Construction Plans for the “Champion-2008”
> TLUD Gasifier Cookstove”, I am writing you this email regarding some
> questions. My name is Hans-Christian Schomburg and I am studying
> Mechanical Engineering (Bachelor) at Otto von Guericke-University,
> Magdeburg. Part of my Bachelor thesis contains research and design of a
> TLUD. I would be very glad, if you could help me concerning my questions.
It is wonderful to have the younger generation becoming involved. Please continue your efforts.
>
> 1. Is it possible burning the char in a separate pyrolysis?
That wording is not clear. In a separate STOVE, yes. Use one for charcoal burning. But it would not be a continuation of pyrolysis, which is a separate process that ends when the batch has been pyrolyzed and the char is produced.
> Especially can you use
> it as a staple for starting pyrolysis?
Yes, you can put the hot char on top of another batch of fuel in a TLUD stove.
> 2. Do numbers exist regarding the energy output and the amount of people,
> the stove is designed for?
Not really. The cooking habits and needs are so highly different between cultures and between types of cooking (soup, frying, simmering long time, etc.)
> 3. Do you know a stove design for refilling an already burning stove?
Not as a stove. A much larger char maker by Gordon West and friends in New Mexico, USA, is functional, but too expensive to be a stove.
> 4. Does the pyrolysis chamber has to stand perpendicular to the ground? Have
> testings been done in different angles?
Inclined TLUDs are not “normal”. Tried but not seen as successful for further development.
> 5. Does the height above ground level have significant influence towards the
> pyrolysis? Is there a maximum height, at which it stays clean?
For stove sizes, 60 cm is tall. Could be a full meter, but becomes less stable. Main impact comes from the size of the riser above the concentrator.
> 6. Is there a way of regulating the pyrolysis, apart from using a fan?
Many ways to limit the entry of the primary air. See Troika in Uganda and the cone-plug on Champion TLUDs in India.
You have much reading to do about the prior work with TLUD stoves.
Doc
Doc / Dr TLUD / Paul S. Anderson, PhD
Exec. Dir. of Juntos Energy Solutions NFP
Email: psanders@ilstu.edu<mailto:psanders@ilstu.edu> Skype: paultlud
Phone: Office: 309-452-7072 Mobile: 309-531-4434
Website: www.drtlud.com<www.drtlud.com>
>
>
> Thanks in advance for your answers,
>
> Sincerely,
> Hans-Christian Schomburg
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