[Stoves] Strata combustor general principles

[kgharris]

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. 
  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




  Refers to:



    Message: 2
    Date: Mon, 14 Sep 2015 15:47:45 -0700
    From: "kgharris" <kgharris at sonic.net>
    To: "Discussion of biomass cooking stoves"
    <stoves at lists.bioenergylists.org>
    Subject: Re: [Stoves] Strata combustor general principles
    Message-ID: <AE057DF4C0F64D97B11A3910E2422C37 at phyllisPC>
    Content-Type: text/plain; charset="utf-8"




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