[Stoves] submit your char for water treatment experiments

Tue Oct 2 19:06:22 CDT 2012

Hi Josh,
We are very interested in working with to learn more about how well
different biochars are able to filter water. We have a lot of interest and
demand for this biochar application from the communities we are working
with. You and your work have been much on my mind and have figured
prominently in several recent conversations. By the way Hugh McLaughlin
currently has 8 of our biochar samples (including wood, coco husk, bamboo
and cacao chaffe, all created in J-ROs, J-RO fired retorts or the TLUD
Estufa Finca cook-stoves. Probably not enough to share, but maybe worth
asking?
I'll follow-up off list.
saludos
Art Donnelly

On Mon, Oct 1, 2012 at 1:00 PM, <stoves-request at lists.bioenergylists.org>wrote:

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> Today's Topics:
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>    1.  submit your char for water treatment experiments ???
>       (Josh Kearns)
>    2. Re: Fabricated Burn Barrel TLUDS (Paul Anderson)
>    3. Re: Fabricated Burn Barrel TLUDS (Alex English)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 1 Oct 2012 10:24:15 -0600
> From: Josh Kearns <yeah.yeah.right.on at gmail.com>
> To: Discussion of biomass cooking stoves
>         <stoves at lists.bioenergylists.org>
> Subject: [Stoves]  submit your char for water treatment experiments
>         ???
> Message-ID:
>         <
> CA+tERD6C7Jbv7Wyw6YbGuFyvV5QHxcom_N3UJpW0nQ+pWSuTqg at mail.gmail.com>
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>
> Hi Stovers -
>
> My colleagues and I investigate the applicability of local chars (e.g. from
> char-producing stoves like the TLUD design) in water treatment/water
> quality, for example household and village-scale decentralized water
> treatment and eco-sanitation. (E.g. see
> http://www.biochar-international.org/profile/water_filtration)
>
> If you're interested in contributing to this work by sending us char
> sample(s) for testing please get in touch with me:
> joshua.kearns at colorado.edu.
>
> Thanks!
>
> --
> Josh Kearns
> PhD Candidate
> Environmental Engineering
> Engineering for Developing Communities
> University of Colorado-Boulder
>
> Director of Science
> Aqueous Solutions
> www.aqsolutions.org
>
> Mobile: 720 989 3959
> Skype: joshkearns
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> ------------------------------
>
> Message: 2
> Date: Mon, 01 Oct 2012 11:32:00 -0500
> From: Paul Anderson <psanders at ilstu.edu>
> To: Kobus Venter <vuthisa at yahoo.com>,   Discussion of biomass cooking
>         stoves <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Fabricated Burn Barrel TLUDS
> Message-ID: <5069C580.9020802 at ilstu.edu>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> Kobus,
>
> That is great work.   Very interesting.
>
> I do not join so many specialty groups, even when interested.   I much
> prefer that the discussions are open to all via main Listservs such as
> Stoves.
>
> I hope you will prepare something that could go onto the Stoves and/or
> Biochar and/or DrTLUD websites that anyone can access without joining.
>
> Paul
>
> Paul S. Anderson, PhD  aka "Dr TLUD"
> Email:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
> Website:  www.drtlud.com
>
> On 10/1/2012 8:10 AM, Kobus Venter wrote:
> > Paul, Tom, Ron, Alex, Crispin, AD and all,
> >
> > Paul, you have summarized it well, we'll have to see if the actual is
> > close to the estimate.  Yes I am aware that biochar needs to be light
> > and rigid yet easily crushed and adsorbtion capacity tests would need
> > to be performed. I understand the basics of the TLUD well and have
> > also been referred to Hugh's toucan etc, although admittedly I have
> > never built one like that. As you may have seen from my earlier
> > pictures I needed to process a large amount of biomass feedstock
> > without incurring large transportation costs, i.,e transporting
> > feedstock to the kiln. I was processing about 80 tons of 6 - 8 weeks
> > dry feedstock (invasive aliens aka Working for Water) in my most
> > productive month. Because of the non-uniform nature of the feedstock,
> > TLUD's were not considered and not sure if an upscaled TLUD would have
> > been up to the challenge. In my situation mobility was paramount. The
> > rugged and steep terrain required the 6 kilns to be transported in
> > dissembled sections up the mountain side on the back of a LDV (small
> > truck). For biochar end use, once assembled (with bolts, no welding)
> > the Transportable Kiln is fitted with flanges top and bottom (hammered
> > into place), 3 sealable 55 gal drums are lowered and wedged in with
> > central cone to keep them in place. The kiln (along with the 3 x 55
> > gal drums) are rolled as one unit into position on preselected leveled
> > out terrain. The kiln and conical lid would typically only be rolled
> > 30 or 40 metres every 4 days or so to work through the piles of
> > timber. To extract the biochar the the kiln is pushed over onto its side.
> >
> > I hereby extend an invitation to anyone on this list to join my
> > Portable Kiln Google Group
> > http://groups.google.co.uk/group/portable-kiln Just ask to join with
> > your reason for joining - if I know your name you probably don't have
> > to give me a reason. I think Ron and Yury are already members from
> > this stove group.
> >
> > Have not had much feedback from others because not many have built
> > them yet, but I have posted all my findings and even some kiln plans
> > so everyone gets off the ground with a standard kiln.
> >
> > Regards
> >
> > Kobus
> >
> *******************************************************************************************************************
> >
> > Dear Kobus and all,
> >
> > Retort: When 50/50 inner and outer amounts of fuel as Kobus has
> > mentioned: the Outer burning XX kg yields zero biochar; Inside retort
> > yields 20 to 30& of XX kg, net of 10 to 15% of total fuel used.
> >
> > (Note: charcoal yields from inside a retort of greater than 25 or 30%
> > indicate considerable volatile matter is in the charcoal, which is not
> > generally considered good for the plants/soils. Beware of charcoal
> > that is 40+% of original fuel weight. It will burn in a charcoal stove
> > probably with some limited smoke, but is not good as biochar.)
> >
> > TLUD: One batch, expect about 20% yield by weight. Nearly double the
> > net weight output, and not needing double barrels, etc.
> >
> > Fines are a result of size of feedstock. If making biochar, fines are
> > fine (pun intended). Or fines can be briquetted quite easily if sold
> > to the charcoal market.
> >
> > Biggest problem I see with many attempts to make TLUD-style
> > barrel-size charcoal makers is the poor quality of the lid or top to
> > allow in secondary air that goes to the concentrator hole. If this
> > sentence does not make sense to someone, then that person has not
> > studied the basics of TLUD operation.
> >
> > Users should start with small TLUDs (like McLaughlin's "1-G Toucan"
> > out of tincans - plans are on the web) so that they know that the TLUD
> > fires CAN and should be very clean burning. There is no reason to have
> > smoky TLUDs when using 200 liter barrels unless using wet fuel or not
> > yet adjusting the TLUD to the fuel at hand.
> >
> > Paul
> >
> >
> >
> >
> >
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> >
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> ------------------------------
>
> Message: 3
> Date: Mon, 01 Oct 2012 14:39:18 -0400
> From: Alex English <english at kingston.net>
> To: Discussion of biomass cooking stoves
>         <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Fabricated Burn Barrel TLUDS
> Message-ID: <5069E356.4070003 at kingston.net>
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>
> Tom, Crispin and tangled thread followers,
>
> It's a challenge to keep up with the chat while traveling....
>
> I guess Tom's numbers below would be illuminated by numbers for pressure
> drop across the bed or the fixed reaction zone/throat.
>
> Quite a different beast the batch TLUD.
>
> With restricted primary air, the throatless throat of a TLUD's
> descending pyrolysis front can travel downward at as little as 3 inches
> per hour through a 40 pound per cubic foot pellet fuel with a energy
> yield of say 5000 Btus per pound (this number could be challenged).
>
> The peak temperature in the pyro front would be just under 500C or ~900F.
>
> So  this example represents something close to  a low or slow end
> scenario of 50000 btus/ft2/hr or 158kW/m2. The pressure drop across the
> bed or front would be so small as to be difficult to measure. The
> primary air introduction could be through a drinking straw or two/ft2.
> (Possible slight exaggeration alert!)
>
> Not hard to drive up those numbers with more primary air. With natural
> draft from modest chimneys can certainly double the rate. High pressure
> blowers can turn it into something that sounds like a rocket but at this
> point I am uncertain what the upper limit might be.
>
> Beastly different again is the Pasifier.
>
> Using the same fuel (non charcoal making mode-so 8000btus/lb), and the
> grate area in the up draft portion, I get 150000btus/ft2/hr under 0.1"wc
> pressure drop, and up to triple that, so far, with higher suction in
> electrically powered draft mode.
>
> Then again the pellet world is a bit ivory towerish.
>
> Later, I should be able to offer wrougher numbers for wrougher fuels
> with my wood chip "linear" Dasifier.
>
>
> Alex
>
>
>
>
>
>
>
>
> On 29/09/2012 4:08 PM, Tom Miles wrote:
> >
> > Crispin, Alex,
> >
> > If my calculations are correct the burn rate for downdraft gasifiers
> > is in the order of 70-100 lb/ft2/hr (340-490 kg/m2/hr; 1688-2400
> > kW/m2) with a high performer being about 140 lb/ft2/hr (65 kg/m2/hr;
> > 3377 kW/m2).  So in 24 in diameter you can fire from 220-315 lb/hr
> > (100-143 kg/hr), or up to 440 lb/hr (200 kg) dry (15% MC) fuel.
> >
> > What is the burn rate for a TLUD?
> >
> >
> > Tom
> >
> >
>
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> End of Stoves Digest, Vol 26, Issue 3
> *************************************
>

-- 
Art Donnelly
President SeaChar.Org
US Director, The Farm Stove Project
Proyecto Estufa Finca
<http://email2.globalgiving.org/wf/click?c=1Oy%2FmZbgIyjS5WI580KXwShvfKBcF2eaJvtN7Pi6p7Jl%2FiR4938EMMCBwY%2FuYALeA%2BQYUWN4RpvnxBsBC7e2%2BGIHcONTozBmvsUU5LTL%2FTNk4Q3vxE%2BKdXTV2cxIsFplSPh%2F9nMG3bQMQf4bz9ZK9SHMy46Z8OPLAtMAnPG9SKkPuLCWvofBTLC%2BImqax%2BZTkkF2RvDri5UdgH19NHjHOBj5WMUrS4L62Z2xxUJbBsJdDUOfeifheNFXH546Xm0yul4P2stm%2FTUOJxYnI0nFjXEaYfzxDSc%2FwgqVkR1t0USDHk30%2Fgt9UpDpyzLj37HWtnNQ0q8Jh1gZCkB4Y1Fgbg394gYFkyNqFN4MchxO2Js%3D&rp=wrhiOr2wAxUyDMDlMSqbOkKa0FpPoiCSHffb%2ByfHGClRxIFjEIrUDwAF%2BFD%2BpAPuvam9BDwvSMcadhFv7aFwKoyAXYrFk00%2B92xPIeMHXaTDJ3x0VIj6ZYwjm1win65o&up=YDTqBOjidbCUo%2Far1oAtZjp5ji73zPEvmoO14mevuXzIDUdb6Ac9W13SPOXmzL5NflZkH0HxLp0v4dT9UwEHDV0wSZ1qusv09bIKkUliWs4%3D&u=LHuflw_1TAib_lgCu2JvQw%2Fh0>
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