[Stoves] Trials on TLUD Gas Burners - Counter Current Flow

[Crispin Pemberton-Pigott]

Dear Julien

Thank is exactly the layout John Davies arrived at with his packed bed gasifier. Importantly, he decided to control the power by bleeding air into the stack because he was not cooking with the heat after that point, he was space heating.

He accomplished cooking by making the bottom of the pot a portion of the stack, meaning the gas path went to the side with the exposed pot there, then a vertical chimney.

The clean burn part was the down-inclined into the rising gas stream producing turbulence. It also tends to burn some of the char on top which keeps the flame going under various circumstances.

It is 'close-coupled'.

Good to hear you also found the arrangement produces the effect you need.

Regards
Crispin

BBM 2B567CC3
From: Julien Winter
Sent: Saturday, August 2, 2014 23:55
To: Discussion of biomass cooking stoves
Reply To: Discussion of biomass cooking stoves
Subject: [Stoves] Trials on TLUD Gas Burners - Counter Current Flow


Hello stovers;

This morning I woke up with an idea, and decided to give it a try.  It
worked out quite well.  I put a inverted, conical ring on the top of a
natural draft, top-lit updraft (ND-TLUD) reactor, and set a chimney on top
of that so that secondary air could get in between the bottom of the
chimney and the conical ring.  The rig is a bit like putting a cone kiln on
the top of a TLUD.  The best burner had walls of the cone at an angle 60°
from horizontal.  Secondary air was forced to enter the top of the TLUD in
a downward direction, counter current to the direction of the
pyrogas rising out of the fuel bed.  The result was a turbulent flame
indicative of good mixing of gases.

It is too early to say if this counter flow burner is viable, but is looks
very promising.  It is also very easy to manufacture.
How to get the geometry for a cone can be found here:
http://zenstoves.net/PotStands-Conical.htm#MakingYourOwnCone

I have attached a pretentious blurb.

Cheers,
Julien.

--
Julien Winter
Cobourg, ON, CANADA
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