[Stoves] Strata combustor general principles

[Frans Peeters]

Dear,Kirk

 

       You don't see :it is not a closed compressed system !

But any  reaction vessel (V1 ) with a  venturi  attenuation at the output
gives  a  back reaction in all directions ,so flow  attenuation  under the
grate air input .

By over total power the air input BECOMES SMOKE OUTPUT TOO .! So invers to
your idea ;

A V1  rocket has an input COMPRESSOR powered by the traveling speed plus a
constant fuel input so a nice VENTURY output .

1and 2 you don't have it in a stove of half info .

 

       Yours

Rocket scientist

 

 

Van: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] Namens kgharris
Verzonden: donderdag 17 september 2015 4:58
Aan: Discussion of biomass cooking stoves
Onderwerp: Re: [Stoves] Strata combustor general principles

 

Dr. Boll and Crispin,

 

Thank you for your well considered responses.  I especially like the idea of
balancing the reactor fuel chamber volumn with the combustor size.  I will
keep this in mind as I progress, and seek that balance.  

 

I don't quite understand Crispins flame tube.  The stove appears to be
loaded with charcoal, so there should not be any smoke.  If the clay is
insulating clay than the tube would provide a hot environment for the CO to
burn, if there is a source of secondary air.  If the stove burns wood, by
what principles does the tube work?  Is air injected inside the tube?  This
would make use of the Venturi effect like Roberto's stove.  The flame gasses
accellerating into the tube would drop in pressure and the pressure
difference would help the atmosphere push secondary air into the flame to
equalize the pressure, providing good mixing.  This seems to me like it
might work well if that is how it works.  Is there something else that I
don't see?

 

Kirk  

 

 

----- Original Message ----- 

From: Boll, Martin Dr. <mailto:boll.bn at t-online.de>  

To: stoves at lists.bioenergylists.org 

Sent: Wednesday, September 16, 2015 6:35 AM

Subject: Re: [Stoves] Strata combustor general principles

 

Kirk, 

 

first of all, your stoves and thoughts about TLUD's are very interesting.
And in my opinion

 

 the venturi-concept, you are talking about, -how ever managed- will be
generally the next important step for better burning; - and for less blacked
pots!!! 

 

A presumption I made a year or two ago: 

The (nominal-) power rate of a good working stove has a more or less narrow
relation to the grate-surface, and/or the burning-chamber-volume.

 

 I calculated the given numbers of some different commercial stoves.  My
calculations confirmed my guess.

I dont remember the numbers, but it is easy to calculate the numbers out of
available commercial data.

 

Additional I remind to Crispin's postings, some time ago:

He reported, that he made the burning-chamber of some coal stoves in
Ulanbaator smaller, by just filling some space of the burning-chamber-space
with bricks. And some surface of the grate. In combination with special
incending-procedure, that gave better burning; even by transforming the may
of stoves there, there was an enormous reduction (more than 90%) of
air-pollution. 

So I suspect, if you would use the right-balanced amount of
burning-chamber-volume, you could get a step forward.  The volume within the
venturi-riser-burner-tube should be included in the calculation; but in the
tube there will be, -hopefully- a burning some similar to a LPG or NG flame,
which will afford less volume. 

You could take the power-rate which you achieve with low emission, for
extrapolating the stove dimensions for your desired 5 kW output.

 

 

Regards

 

Martin

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