[Stoves] Definition of char-making appliance

Tom Miles tmiles at trmiles.com
Mon May 6 12:14:05 CDT 2013


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:stoves-bounces at lists.bioenergylists.org] 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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