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 Frank Shields BioChar Division Control Laboratories, Inc. 42 Hangar Way Watsonville, CE 95076 (831) 724-5422 tel (81) 724-3188 fax <mailto:[email protected]> [email protected] www.controllabs.com From: Stoves [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Monday, May 06, 2013 8:07 AM To: 'Discussion of biomass cooking stoves' Subject: [Stoves] Definition of char-making appliance Dear Char Producers What is your opinion of this definition of a 'char making appliance'? Char Making Appliance Any appliance that derives heat largely from the pyrolysis of biomass in a manner designed to produce, as a result of such combustion, a carbonaceous byproduct high in carbon, useful as a fuel or as a 'biochar' and where such product contains not less than 15% of the carbon in the original fuel. If you have a suggestion for an alternative % of carbon, or wish to propose a mass-based metric, please provide a supporting case. Thanks Crispin
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