[Stoves] Definition of char-making appliance

[Crispin Pemberton-Pigott]

Dear Frank

 

Those are all good points. Considering that we are not really in a position
to include biochar industry standards in a stove performance test, and
because there are clearly other applications someone might put the char
remaining to (use it as a fuel in any of several types of device) it is only
going to include a reference to this new type of stove and byproduct. We
cannot load a standard with restrictions that stifle innovation or to not
handle known issues well. If a stove produces fuel, it can be argued that
some consideration of that fuel's energy value be given. If someone else
wants to use that fuel for another purpose, that is their choice. This will
probably the first standard drafted with a reference to biochar and
containing any 'advantage' for producing it.

 

Regards
Crispin

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Frank Shields
Sent: Monday, May 06, 2013 12:04 PM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] Definition of char-making appliance

 

Dear Crispin,

 

We need first to define 'char'.  A stove that ends producing black torrefied
wood is not a char maker, just a very poor stove.  

That definition  I suggest as the IBI does as " > 60% of the DAF being
carbon with H/C ratio < 0.7". OR my lower cost suggestion "loss in weight
under no-oxygen conditions at >450c to be less than a specified percentage".
Say less than 10% of the DAF fraction. 

 

Biochar is more than just the black stuff left over there should be a
qualifier attached. I think the char used for cooking (street vender for
example) could have more volatiles left over than biochar used for soils. It
gets complicated. Street vender char makes a very poor biochar used for
soils. 

 

Regards

 

Frank

 

Thanks 

 

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