[Stoves] CO2 emissions when burning 567kg of wood?

[adam u partner]

CO2 emissions when burning 567kg of wood?

Dear All,
i have to make a project proposal for WiSiONS/Bonn
to introduce a "low-cost retort kiln" and one of their questions is:
"the reduction of CO2 emissions in qualitative terms".
I am a product designer, not very good in scientific calculations- maybe 
someone can help?
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ENVIRONMENTAL BENEFITS (200 words):
. What may be the environmental benefits of your project regarding
- The reduction of CO2-emissions in quantitative terms?
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I have to following idea to start the calculations.
A) traditional charcoal making
Lets assume for producing 100kg of charcoal we need 667kg of wood (no 
moisture, conversion factor for efficiency =15%)

667kg wood, 85% = 567kg wood will burn and smoulder to ash;
and 15% = 100kg will be left as charcoal
How much CO2 will be released when burning these 567kg of wood?
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B)
No the same with an "low-cost retort kiln"
Lets assume for producing 100kg of charcoal we need 333kg of wood (no 
moisture, conversion factor for efficiency =30%)

333kg wood, 70% = 233kg wood will cleanly burn(flared) to ash (and not 
smoulder);
and 30% = 100kg will be left as charcoal
How much CO2 will be released when burning these 333kg of wood?
- - -
So the "BENEFIT in reduction of CO2 emissions would be the difference 
between A) and B).

It gets a little complicated because in A) we burn the pyrolysis gases 
incompletely.
We might not get so much CO2" because it will stay CO and other components

It also gets complicated in B)
because we are burning/flaring the pyrolysis gases from the retort in a 
hot combustion chamber. CO will be burned to CO2
Same with methane. 5%(?) of methane gases might be contained in the 
overall of the pyrolysis gases.
Its good to burn the methane gases because methane is 21x (?) more 
harmful to the greenhouse effect than CO2.
But actually when burning methane we produce additional CO2.
So if exactly follow the question from above about the "reduction of CO2 
emissions"-
burning the methane is increasing the CO2 emissions.
Thanks in advance
Chris

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