[Stoves] is this new?

[Marc Pare]

Tom, I measured CO with a probe at the top of the cylinder using my UEi
combustion analyzer.
I've got the bottom of the line model that only measures CO and O2. It has
trouble with CO higher than 1300 ppm, but I wasn't getting any higher than
400 ppm during these tests.

Marc Paré
B.S. Mechanical Engineering
Georgia Institute of Technology | Université de Technologie de Compiègne
http://notwandering.com


On Sat, Jan 19, 2013 at 11:43 AM, Tom Miles <tmiles at trmiles.com> wrote:

> 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:****
>
> [image: 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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