[Stoves] Lots of primary air

[Anand Karve]

Dear Marc,

It seems that all the oxygen in the primary air is not consumed at the
point where the wood is burning and that the leftover oxygen is
utilized for burning the volatiles in the flame.

Yours A.D.Karve
***
Dr. A.D. Karve

Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)

Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)


On Fri, Jun 5, 2015 at 5:44 PM, Marquitusus <marquitusus at hotmail.com> wrote:
> Hi to all,
>
> Running my rocket stove, which is under a low-mass mud oven (which allows to
> clearly see if I the stove produces smoke or not) I have always observed
> that the cleanest burning happens when the primary air is not obstructed by
> ashes or coals. Also in all the rocket stoves I have seen, it is mantain the
> air entrance free from obstacles for them to burn clean. The more primary
> air, the less smoke.
>
> So I build a combustion chamber with a lot of space below the burning
> sticks, so it can have a lot of primary air, never obstructed by ashes or
> burning coals. I also put a longer combustion tube, about 50cm long, to give
> the gases enough space and time to completely burn. I also put some
> secondary air holes about 10cm above the burning sticks: 16 holes about 1cm
> diameter each.
>
> The result is quite satisfactory: most of the time I have no smoke, and only
> in the begining and when I put too much fuel I have smoke until the tips are
> well ignited. With this cleaningness of combustion, I'm using it again to
> power my oven without the fear of getting the food "blackened" due to smoke.
>
> I know this experience does not agree with the clean combustion "laws" about
> primary/secondary air ratios of 1/4 or less, but this has really worked for
> me. I've tried this configuration a lot of times in the lasts months, and
> I've always found that more primary air, gives less smoke.
>
> What do you think about it?
>
> Regards,
> Marc
>
>
>
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