[Stoves] Time at Aprovecho

[kgharris]

Julien,

I have added and removed the components from the stove and watched the results on an informal basis.  What you are describing is more formal and will take a lot more time.  My thought is that one cannot do this until the component is designed and its function is understood as much as possible.  The wick, for example, is brand new and my time was spent discovering it and finding a design that worked.  There are a number of wicks that didn't work.  No sense getting information on those.  Now that there is one that works, your plan is good.  Still, there are a number of untried wick designs I would like to try.  Should I wade through those first and perhaps find one that works even better, or focus on the current design.  Each component effects the others, like the change needed in the stationary fan when turn-down was increased.  The whole system should probably be optimized as much as possible before detailed measurements are taken. On the other hand, the information you describe could lead to an improved component or system, so the informal and the formal can work together.  My conclusion is that in time, and it is close, I will need to do as you suggest.   You are right, that information will be important and useful.  Thank you for the thoughts and the direction. 

Kirk
  ----- Original Message ----- 
  From: Julien Winter 
  To: Discussion of biomass cooking stoves 
  Sent: Monday, April 11, 2016 5:38 PM
  Subject: [Stoves] Time at Aprovecho


  Hi Kirk;



  Thanks for your update, and documents.  You are doing some pioneering work for natural draft TLUDs.  It is important for follow creative lines of inquiry, because we shouldn't expect — based on current practice and theory — that we can reliably predict the results ahead of time.  The more complex the system, the more important it is to experiment.  TLUD syngas is variable and complex!!


  One challenge that we face with natural draft burners is making them work over a wide range of gas production rates.  It is interesting to see how you have designed various components to come into play as flame size increases.   These innovations may be applicable to other styles of burner, especially the stator.


  I expect that you have done this, but have you measured burner emissions as you sequentially added components to your burner or unblock secondary air intakes?  As each component is added, I would test its performance over a range of gas production rates.  For example, what difference does it make to have the stator installed, or not, at different power levels?  A graph of particulate emissions vs. specific gasifcation rate (or primary air superficial velocity), with two curves ±stator would be informative.  This kind of analysis would help others to see the relative contribution (or interference) of the various components.  

  If you have this kind of data, it would make an interesting paper.  



  This, by the way, is what I call 'stove testing'; not a couple of Water Boiling Tests V.4.2.3 which to me looks more like 'stove certification'.



  You have done a number of interesting things that I have not tried, because I have only played arround with the main site for for introducting secondary air.  Your work stimulated me to try the "annular, cross-current burner".



  Thanks again for sharing the progress of your work.



  Cheers,

  Julien.


  -- 

  Julien Winter
  Cobourg, ON, CANADA



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