[Stoves] Insulation and stove life

[Kevin]

Dear Crispin
  ----- Original Message ----- 
  From: Crispin Pemberton-Pigott 
  To: 'Discussion of biomass cooking stoves' 
  Sent: Friday, June 14, 2013 6:37 PM
  Subject: Re: [Stoves] Insulation and stove life


  Dear Kevin

   

  I think it is pretty obvious that a fan-powered stove will loft a lot more small particles than a natural draft version. They can easily be blown up through the fuel bed. If it is chimney-type ND stove then it is not such an issue.



  # Agreed. However, the big thing is the need for test work to quantify the nature and extent of such particles. A forced draft system that puts a large quantity of the small particles into the atmosphere of the Living space is certainly a problem. 



  Best wishes,



  Kevin

   

  Regards
  Crispin

   

   

  ++++++++

   

  Dear Crispin

   

  Thanks very much for your helpful comments. 

   

  Clearly, a chimney that vents products of combustion outside the Living Space is advantageous, compared to a stove system that vents into the Living Space. 

   

  I was aware of the great importance of the size of the Particulate Matter. Basically, "big dirt particles" are not nearly as bad as are fine particles that can lodge deep in the lungs. Clearly also, "more bad-sized particles", with "bad type composition", are worse than fewer "safer sized particles", of "relatively neutral composition.

   

  The only way to "digitize the generalities" is with a scientifically sound test program that identifies and then measures the relevant parameters. Once numbers have been attached to the relevant parameters, then it is relatively easy to determine whether or not a given stove system is "safe" or "hazardous."

   

  Rice Hulls are very interesting. While they have a high percentage of highly siliceous ash, complete combustion could potentially make the ash available in a hazardous manner.  In Paul O's case, where he is interested in char making, I would guess that most of the siliceous components would remain embedded within the char particles, in a safe and non-hazardous manner. However, some ash particles would be liberated in that some of the char would be burned in the pyrolysis process. 

   

  Best wishes,

   

  Kevin



------------------------------------------------------------------------------


  _______________________________________________
  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/20130618/8cc4a5b7/attachment.html>