[Stoves] Lots of primary air

Energies Naturals C.B. energiesnaturals at gmx.de
Wed Aug 19 08:33:53 CDT 2015


Hola Marc,

no te pareix que sería hora de commençar un grup de biochar seriós a Mallorca?

Salut

Rolf



On Mon, 8 Jun 2015 09:00:15 +0200
Marquitusus <marquitusus at hotmail.com> wrote:

> Dear A.D.Karve and Crispin,
> I agree with Karve, I think the primary air not consumed in the primary burning is used in the flame zone to burn the gases.I think this is some kind of "balanced point" I've found that maybe only works on high power mode: as I am powering an oven, I use this stove on high power mode almost always. I haven't tried enough in low power mode.
> Crispin, yes, I do have a grate under the tips of the sticks, and I do normally burn the charcoal. Only ashes are left.When you say "make an opening at the back of the stove to admit the air" I wonder: still more primary air? Why this hole?
> Yes, the excess air maybe dilutes the smoke and this may be the reason I don't see it. Maybe some day I'll get a combustion analyser, but prices are still too high for me.
> Thanks
> > Date: Sat, 6 Jun 2015 09:25:39 +0530> From: adkarve at gmail.com
> > To: stoves at lists.bioenergylists.org
> > Subject: Re: [Stoves] Lots of primary air
> > 
> > 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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>  		 	   		  

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