[Stoves] stoves and credits again

Paul Anderson psanders at ilstu.edu
Thu Sep 21 23:32:16 CDT 2017


Andrew,

Thank you for your calculations that are strongly supportive of what I 
wrote about TLUD charcoal.
Now we all need to put the facts into good use as we make constructive 
efforts to utilize this distinctive char-making feature of TLUD stoves.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 9/21/2017 1:54 PM, Andrew Heggie wrote:
> On 21 September 2017 at 18:17, Paul Anderson <psanders at ilstu.edu> wrote:
>> 1.  Pyrolysis is around the 550 to 650 C range (unless burning very hot with
>> much forced air)
>> 2.  The char yield is about 20% of the dry weight of the biomass fuel
>> (mainly think of wood).
>> 3.  That char contains about 30%  (NOT 50%) of the ENERGY of the biomass.
> Paul I have had a look at some of the early work on charcoal, I see
> graph by Pohl 1970 that show charcoal heated to 600C being composed
> 90% fixed carbon, now if you ignore the other 10% that contains carbon
> hydrogen oxygen and ash and you still have 20% of the original dry
> weight then you have 18% of the original dry weight as carbon. So if
> you start with dry hardwood at the 18.6MJ/kg Tom Reed allowed for it
> and most woody biomass and end up with 0.18 carbon at 33MJ/kg so about
> 32% in the fixed carbon plus a contribution from the 8% of tars etc.
> less the 2-3% ash (more ash from leaves buds straw etc.) So I suspect
> you are more right to be at the lower end than the 50% I gave which is
> what I remember from charcoal made at lower temperatures for sale in
> barbecues.
>
>
>> If writers wish to continue to say 50% of the ENERGY remains in TLUD-type
>> charcoal, then let's resolve that here and now.   Otherwise there can  be no
>> true discussion about the value of the TLUD char.
> Agreed, let's see what figures others have.
>
> Andrew
>
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