[Stoves] Lots of primary air

Anand Karve adkarve at gmail.com
Wed Aug 19 21:57:54 CDT 2015


Dear Crispin,
your statement that the smoke might have become invisible due to its being
diluted by too much air, admits the fact that there was less smoke per
cubic meter of air, which is what all of us are aiming at.
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 6:01 PM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Marc
>
> You have a lot of secondary air ‎entering the upper fire with the primary
> air. This is typical for that layout.
>
> Being invisible does not mean there is no smoke. It just might be diluted
> by excess air.
>
> A crossdraft stove might have a quarter of the secondary air you do. ‎It
> depends on a lot of things. If you want to progress further you need a
> combustion analyser. You want to have an oxygen level in the exhaust (right
> at the edge or under the edge) of the pot of under 10.5%.
>
> There are still a couple of things you can try. Put a grate above the
> primary air to catch the charcoal and burn it. It will save fuel. Then,
> make an opening at the back of the stove to admit the air.
>
> Regards
> Crispin
>
> BBM 'Crispin'
> *From: *Marquitusus
> *Sent: *Friday, June 5, 2015 19:14
> *To: *stoves at lists.bioenergylists.org
> *Reply To: *Discussion of biomass cooking stoves
> *Subject: *[Stoves] Lots of primary air
>
> 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
>
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://stoves.bioenergylists.org/
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20150820/a81477cb/attachment.html>


More information about the Stoves mailing list