[Stoves] is this new?

[Tom Miles]

Marc,

 

Producer gas usually ignites where it meets the air. I would have though
that you would have seen higher CO in the cylinder. Where did you measure
the CO? With a probe or a hood?

 

Tom

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Marc Pare
Sent: Friday, January 18, 2013 8:26 PM
To: Discussion of biomass cooking stoves
Subject: [Stoves] is this new?

 

So, I was playing around with burners on a Belonio rice husk gasifier last
night. 

If you're not familiar, there are a bunch of photos of the basic design on
google image: batch stove images
<https://www.google.com/search?q=belonio+batch+stove&sugexp=chrome,mod%3D16&
um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=kh76UMnkBOiriAforYHQCw
&biw=1282&bih=717&sei=lB76UMTnOaSjigfp3YGgDw> 

 

I slid a metal cylinder into the opening of the top of the reactor, leaving
a gap along the sides. Here's a picture:

Inline image 1

Now, normally when you take the burner top off of these stoves, there's no
combustion inside because there is no secondary air available.

Well, I saw a roaring flame inside after sliding in the metal cylinder
(option #2 in the diagram)

 

As far as I can tell, the cylinder acts like a chimney, causing a pressure
drop which sucks producer gas from the bed, not allowing it to escape
through the gap on the sides. 

As a result, secondary air sinks through the gap and you get combustion at
the bottom of the cylinder.

 

Has anyone seen something like this before? I can't think of any examples. I
called it a "heat pump" in my field notes.

 

With the right dimensions is might be a good auto-regulating burner: more
producer gas producers more heat, pulling in more secondary air. 

I think it could be useful for charcoal stoves as well as TLUDs. 

I measured lower CO than usual with Belonio burners. Similar excess air
levels (though I only tested two sizings of the metal cylinder).

 

Marc Paré
B.S. Mechanical Engineering
Georgia Institute of Technology | Université de Technologie de Compiègne

http://notwandering.com

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