[Stoves] Charcoal and Stoves

[Tom Miles]

If the fuel conversion of the stove is based on performance without char
burnout then there is no penalty for removing residual char for other
purposes. In the Lifeline cases cited the uses appeared to be essential
activities in the household.

In the biochar case there can be more benefit from the agronomic uses -
reduced cash for fertilizer, reduced labor for watering, improved yield,
etc. - than for carbon sequestration. Depending on the application and the
fuel it may be more practical to make the biochar in other devices but it
may be suited to small garden plots.

On Mon, Jan 27, 2020 at 3:15 PM Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Thank you Tom.
>
>
>
> For CDM projects, there is no consideration given for the removal of char
> in the fuel efficiency calculations, which underlies the determine of
> generation of CER’s.  There easily cold be, but there is not.
>
>
>
> Only a reduction of fuel consumption is considered, and that is
> field-assessed.  If one were to argue that the char was being sequestered
> in an inaccessible and permanent manner, one could propose a new rule for
> the calculation of GHG’s considering retained char.
>
>
>
> The only thing they record for stove projects is fuel mass harvested for
> cooking.  Obviously there is an implication that the carbon is (largely)
> released as CO2.
>
>
>
> Regards
>
> Crispin
>
>
>
> *From:* Stoves <stoves-bounces at lists.bioenergylists.org> *On Behalf Of *Tom
> Miles
> *Sent:* Monday, January 27, 2020 17:54
> *To:* stoves at bioenergylists.org
> *Subject:* [Stoves] Charcoal and Stoves
>
>
>
> It was an eventful gathering at the ETHOS meeting in Kirkland, Washington,
> USA, this weekend. Many thanks to Elisa Derby, Nordica MaCarty, the ETHOS
> board and volunteers for our 20th year celebration.
>
>
>
> It was apparent to me from the advanced modelling, lab performance data,
> field tests and field experiences which were reported that charcoal is an
> important component of household energy and food security. Within the stove
> charcoal combustion contributes high peak temperatures which can improve
> performance and reduce emissions. This is demonstrated in the addition of
> the "Jet-Flame" to a Rocket Stove, which I view as a charcoal burner. By
> introducing a little pressurized air at the grate you can "low on the
> coals". The addition of uniformly distributed undergrate air, with even a
> little pressure, is enough to improve char combustion and shorten the
> flame, which should indicate increased carbon monoxide burnout. Aprovecho
> showcased the Jet-Flame at ETHOS. Their testing showed nearly complete
> charcoal burnout.
>
> https://www.chinadaily.com.cn/a/201911/08/WS5dc507d8a310cf3e355763b2_2.html
>
>
>
> Others from Lifeline said there were circumstances where the charcoal is
> very important for other uses in the household and that burning out
> charcoal would not be desired. Someone with a better memory can remind me
> of what those uses were,
>
>
>
> Biochar advocates want to make charcoal for use in the soil while cooking,
> which is usually accomplished by removing charcoal faster than you are
> consume it.
>
>
>
> In cases where we want to leave residual charcoal or remove it to make
> biochar we need to balance the performance benefits of burning the charcoal
> with the household needs or food security  - biochar - benefits. We have
> new tools but we need to find out how best to use them.
>
>
>
> Tom
>
>
>
> --
>
> T R Miles Technical Consultants, Inc
> Portland, OR 97225
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-- 
T R Miles Technical Consultants, Inc
1470 SW Woodward Way
Portland, OR 97225
tmiles at trmiles.com
www.trmiles.com
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