[Stoves] Analysis of emission profiles from charcoal produced from selected tree species by different pyrolysis methods

[Nikhil Desai]

Teddy:

Do you know carbon sequestration profiles of different tree species and
crops?

How does one address the issue of PAHs as an interim product to CO2, which
is good, versus direct emissions of PAHs, for which there is no GHG
computation?

I suppose efficiencies are in some way linked to the shares of PAH and CO,
CO2 in the combustion process, so that a higher-efficiency stove would
produce fewer PAHs but greater CO2. If one were to address GHG-neutrality
only in terms of CO2, this would seem to frustrate the desirable goal of
more complete combustion.

There is always a trade-off between growing the charcoal feedstock versus
burning charcoal with higher efficiency. And if a stove were selected on
the basis of higher efficiency rating as well as lower CO2 emission rates,
it is by no means certain that it would succeed in real circumstances.

Nikhil
------------------------------------------------------------------------
Nikhil Desai
(US +1) 202 568 5831
*Skype: nikhildesai888*



On Thu, Feb 7, 2019 at 12:48 AM Cookswell Jikos <cookswelljikos at gmail.com>
wrote:

> Good morning all,
>
> Being a big proponent of growing more of these types of indigenous trees
> for charcoal in Kenya (we include free seeds with each stove purchase) I am
> happy to see this report on the different emission levels from various
> types of charcoal.
>
> How different emissions from charcoal would affect the taste of food is
> anyone's guess, but it does lend credence to stories I have heard of why
> chefs in the Middle East etc. insist on importing tons of illegal acacia
> charcoal from Somalia.
>
> More tests on the dozens of other species of local trees that are
> preferred for firewood/charcoal would be most interesting to read if anyone
> has any that they could share.
>
> *''All the charcoal from the three tree species under study emitted
> similar types of PAHs but at significantly different concentrations. A.
> xanthophloea charcoal prepared by efficient pyrolysis emitted the least
> concentration of PAHs. Thus, according to this study, using charcoal
> produced from  A.  xanthophloea by efficient pyrolysis presents a better
> opportunity to reducing exposure from PAHs emit-ted from biomass fuels.''*
>
>
> https://link.springer.com/epdf/10.1007/s13762-019-02220-x?author_access_token=XDpVhLZRgWpLPgeDkoTvCfe4RwlQNchNByi7wbcMAY4TAzk706nlQbkDAKP1sFLIg30j6XGmh3a8qNepBVgX9Ho3rnVR3Bwh6UKPAk0PXABQcXH3pMGCxPXZphBhoV3PlFv8BcLjbyaIt4xOVZKisw%3D%3D
>
> Teddy Kinyanjui
> Sustainability Director
>
>
>
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