Re: TLUD stoves as Biochar producers was RE: [Biochar] Energy utilization from process
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Paul,
Yes, good idea. Johannes Lehmann and some others prefer the water quenching for generating more active chemical exchange sites on the biochar (carboxyl and hydroxyl groups), but your method makes it easy to get yield data. I will try it sometime soon since I am curious about the yield of my own TLUD.
Wayne
From: main@Biochar.groups.io <main@Biochar.groups.io>
On Behalf Of Paul S Anderson
Sent: Sunday, March 6, 2022 1:20 PM To: main@Biochar.groups.io Subject: Re: TLUD stoves as Biochar producers was RE: [Biochar] Energy utilization from process
CAUTION: This email originated from outside of JMU. Do not click links or open attachments unless you recognize the sender and know the content is safe. Wayne,
Your graph is as should be expected. See the “All biochars are not created equal….” presentation from 2009 with Hugh McLaughlin as lead author.
Small TLUD burn can have their biochar extinguished when placed into an airtight heat-tolerant container. I like to use “popcorn tins” that are sold around Christmas time. No water needed. The metal will “suck out the heat” from the char as well as being smothered.
Paul
Doc / Dr TLUD / Paul S. Anderson, PhD --- Website: www.drtlud.com Email: psanders@... Skype: paultlud Phone: Office: 309-452-7072 Mobile & WhatsApp: 309-531-4434 Exec. Dir. of Juntos Energy Solutions NFP Go to: www.JuntosNFP.org Inventor of RoCC kilns and author of Biochar white paper : See www.woodgas.energy/resources Author of “A Capitalist Carol” (free digital copies at www.capitalism21.org) with pages 88 – 94 about solving the world crisis for clean cookstoves.
From: main@Biochar.groups.io <main@Biochar.groups.io>
On Behalf Of Teel, Wayne via groups.io
Paul and all,
A number of years ago two students and I stuck two thermocouples inside a TLUD designed from your specifications and got the following graph from the burn:
The burn from the top looked like this:
You can see the thermocouples going into the bottom of the TLUD. It burned for about 25 minutes using wood pellets as the fuel source. Unfortunately the students did not get the before and after weights from the burn. One problem is that if you quench with water, you have to thoroughly dry the product, and we did not have a good ability to do that at my home. We were not allowed to do biochar burns on campus. At least we can help with some temperature data. The top was 2.5cm below the top of the fuel and the bottom was 6 cm from the bottom of chamber, which itself is 2.5 cm about the ground surface.
Wayne
From: main@Biochar.groups.io <main@Biochar.groups.io>
On Behalf Of Paul S Anderson
CAUTION: This email originated from outside of JMU. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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@... for a detailed explanation of low risks and potential rewards.)
Paul
Doc / Dr TLUD / Paul S. Anderson, PhD --- Website: www.drtlud.com Email: psanders@... Skype: paultlud Phone: Office: 309-452-7072 Mobile & WhatsApp: 309-531-4434 Exec. Dir. of Juntos Energy Solutions NFP Go to: www.JuntosNFP.org Inventor of RoCC kilns and author of Biochar white paper : See www.woodgas.energy/resources Author of “A Capitalist Carol” (free digital copies at www.capitalism21.org) with pages 88 – 94 about solving the world crisis for clean cookstoves.
From: main@Biochar.groups.io <main@Biochar.groups.io>
On Behalf Of Geoff Thomas via groups.io
I have a TLud I bought from Tom in 2007, you light it at the top, it burns down, the air is pumped up from the bottom, so oxygen starved air goes up to the charcoal, producing mainly carbon monoxide (small amount hydrogen) as the flammable "wood gas" - then usually it is used for cooking directly but sometimes it is piped off to supply a stove elsewhere, - or run a car, although too much tar to run directly. The Tlud is not a mainly charcoal producing stove that I have seen, perhaps 10% at best.. Geoff.
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