[Stoves] combustion of char

[Kevin]

Dear Crispin

No I don't have any information on the Hawaii system, as developed by Dr. Antal et al, other than that the "charcoal yields' were very high... as I recall, in the order of 50% of the weight of the incoming dry biomass. I am guessing that with the high pressures, many of the tar components would not decompose, and would remain with the char. I am also guessing that when such charcoals were burned, they would be smoky. 

If these speculations are correct, then this form of charcoal would be very much different than the "more normal" atmospheric charcoals, and their tendency toward possible spontaneous combustion would be very much different... maybe a lot more susceptible, maybe a lot less susceptible.

It would be very good if Dr. Antal et al could provide factual information on how their charcoal behaved.

Best wishes,

Kevin
  ----- Original Message ----- 
  From: Crispin Pemberton-Pigott 
  To: 'Discussion of biomass cooking stoves' 
  Sent: Sunday, February 24, 2013 8:46 PM
  Subject: Re: [Stoves] combustion of char


  Dear Kevin

   

  Do you perhaps have and material or info you heard about the charcoal produced under pressure (as per the Hawaii system)?

   

  It would be interesting of there were substantial differences related to the pressure at the time the charring took place.

   

  Thanks
  Crispin

   



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