Good proposal.
A char making appliance is a gas making appliance that makes char as a byproduct. By this definition it converts 85%, or less, of the solid fuel to gas. The remainder is char and ash (15%). 15% carbon is a reasonable reference point since it can cover a wide range of gasifier types that can be run inefficiently to make char. Efficient gasifiers will make about 3-5% char/ash. Carbon conversion is often 90-95%. Since most biomass is 50% carbon that's 45-48% of the mass. 15% carbon would be about 7.5% of the biomass. Tom . 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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