[Stoves] pre-mix of wood-smoke with air? and how?

[Jeff Davis]

Dear Martin and All,

Martin wrote:
> Do you have some papers of that? The old ones are possibly in German or
> French. -I did forget the name of a man experimenting in Austria about
> that, I think it was before coal was used to be gasified.

Yes, and will be SLOWLY uploading them to my web page. Stay tuned.





> In fact I saw simple woodgas, (without air) streaming out of a hole of a
> can approx 2 or 3mm diameter, that I could not ignite, because of blowing
> out the igniting flame. Therefore I think there had to be used a
> "Prallplatte" (=baffle?) to have somewhere inbetween the nozzle and the
> baffle the right speed to form a stable flame or/and to re-ignite. (I saw
> that theme discussed and described later on in the wing-stove-page. In:  

Woodgas/producer-gas varies greatly. H2 rich gas likes to stay lite. But if 
you have too much air premix with rich H2 gas the flame will race back to the 
air source. CO only gas is kind of hard to keep a flame in my burner on a 
windy day. But I am guessing when I have H2 rich gas or CO rich gas. I have 
no way to measure the gas.

The fuel, humidity and SV have a major affect in the composition of the 
woodgas or that's what I have experienced.  




> Jeff wrote:
> >I try to condense as much as possible. Cleaner gas!
>
> For only burning purpose, and not for gas-engines, I think all smoke burns
> to clean burning gasses, if there is the right ratio and the right burning
> temperature, depending as well on the temperature of the un-burnt smoke and
> the air for burning.

Well, I wouldn't bet the farm on that. Kevin would tell us "everything is a 
gasifier and only gas burns." So I would think that it would be somewhat 
easier to burn a gas than a gas plus liquid/vapor. The more consistant the 
gas the better the burner will perform.

I guess I'm all for good gas, it just makes life easier.  

And if we can put charcoal to good use as Terra Preta why not put condensate 
to work as wood vinegar. ..... My potatoes seem to like it.

But yes, in a small cook stove it may not be practical!

I also stand to be corrected on any of the above.

Good stuff this biomass. ..... Lot's to learn!




Best regards,

Jeff