[Stoves] Remarkable stove

[Crispin Pemberton-Pigott]

Dear Julien

I am pretty sure I do. I will search a little.  It there is a sooty flame it usually means the cracking of the gasification products is incomplete so it/they remain as a condensable but evaporated liquid. A bottom-lit updraft, top loaded gasifier such as those made by Hirendra have high tars (evaporated form) in the output plus a lot of water which has to be condensed, but the resulting gas is high energy.  TLUD has the same amount of water (chilling the flame) but lower energy gas with fewer tars (long chain CxHy).  Getting that to minimize helps the “sooty flame” but sooty flames are more a problem of poor combustion conditions than only the inputs.  The TLUD makers have approached the task of creating gas pretty comprehensively but not how to burn what is generated.  As you say, a hole with a wavering flame coming out is easy to make.  Perhaps it would be better to make “better” gas and not introduce secondary air until the point of combustion, meaning at the pot. There are many ways to comb a cat.

Best regards to Coburg
Crispin

From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Julien Winter
Sent: Wednesday, June 16, 2021 6:45
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: [Stoves] Remarkable stove

Hi Crispin;

I too have made burners with a flat flame needing a lower riser.

However, we still use concentrator ring burners, because it is easy for people to make from readily available sheet metal or clay-coated concrete.  Simplicity won the day.

One way to get more space may be to design a removable grate at the bottom of the firebox, and have the TLUD drop into the ash pit.

Do you have a link to a photo of Riaz Ahmad's gauze burner. Several of us have tried that for natural draft TLUDs without success. Even porous ceramic burners have been tried. Anything we put in the path of the flame increased emissions of black smoke soot, or only worked over a narrow range of gasification rate.

Cheers,
Julien

--
Julien Winter
Cobourg, ON, CANADA
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