[Stoves] Definition of char-making appliance

[Crispin Pemberton-Pigott]

Thanks Tom. 

 

>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%). 

 

I want ot quibble slightly with the 15%. I am saying 15% of the original
carbon so if it is in the form of char, I am not thinking it is 15% of the
original whole dry fuel mass. This takes care of any implicit assumption
that biomass has any particular carbon % or ash %.

 

>.Since most biomass is 50% carbon that's 45-48% of the mass. 15% carbon
would be about 7.5% of the biomass. 

 

Exactly. But for rice hull or switchgrass or palm fronds or coconut husks it
is quite to be quite different. If the main purpose of make the char is
either as a fuel or biochar, it is the carbon that can be used as a guide. I
don't want to make a stove test a slave to a current interpretation of what
constitutes 'biochar'.  The biochar community is still in its Wild West
phase.

 

Regards

Crispin

 

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