TLUD stoves as Biochar producers was RE: [Biochar] Energy utilization from process

Geoff,    (his message is below, where he wrote:   “The Tlud is not a mainly charcoal producing stove that  I have seen, perhaps 10% at best.”

I have changed the Subject line so that all responses are focused on what I am presenting.)

The primary purpose of TLUD stoves is for cooking.  However, they certainly are also serious producers of charcoal / biochar.   And regarding biochar production capabilities and climate impact, micro-gasifier stoves are the ONLY CARBON
NEGATIVE STOVES IN THE WORLD!!!   And ESMAP of the World Bank declares TLUDs as the ONLY stove technology that uses dry biomass fuels AND is classified as CLEAN modern advanced cooking along with biogas, alcohol, electric and solar  and the fossil fueled stoves
of LPG and Natural Gas.    [Please be sure that you understand the significance of this paragraph.]

TLUD stoves can and do make charcoal at about 20% yield by weight.   This is shown repeatedly in the natural draft TLUD-ND stoves.

The TLUD-FA stoves with forced air tend to consume a bit more of that charcoal because the air flow is more forceful to put some of the O2 into contact with the char (instead of less forceful mixing of the incoming air with the woodgas
that is coming out of the biomass.)

In forced air TLUDs, the operators also tend to let the fan run a bit longer past the point of completion of pyrolysis, also lowering the char yield slightly.

Because the FA chars are created at slightly higher temperatures (maybe 50 or even 100 deg C higher, but never measured) than 550 or 600 C, there is somewhat less volatile (mobile) matter (less weight) but some improvement of the adsorption
capacity.

And there is one MAJOR social factor attesting to TLUD stoves being serious biochar producers.   The commercial value of the charcoal has been clearly proven in the West Bengal projects now with about 100,000 TLUD-ND stoves in daily use,
producing about 80 tonnes of charcoal per day, with approximately 400 persons employed in the charcoal collection business.   That char is sold for replacement of coal or traditionally produced charcoal, and is not available for biochar purposes.   This brings
approximately US$40/yr of cash income to the women of those households.   That is $4,000,000 per year in a small area of West Bengal.

Of special note:    An opportunity to transition some of that charcoal from being burned to being sequestered is currently available, involving 6000 households, or 4.8 tonnes/day of potential biochar.  And the possible carbon credits for
CO2 REMOVAL (@$100 per tonne) would be a great increase in income.   One “packaged project” that is ready for instant implementation (the stoves are already in use with daily charcoal production) needs funding of $400,000 (for only one year) mainly for the
biochar processing and distribution business that is more complicated than just selling the charcoal to be burned.   (Please direct any possible “patron” or sponsor or invester to me at    psanders@ilstu.edu
 for a detailed explanation of low risks and potential rewards.)

Paul