[Gasification] TLUD BEST
Kevin
kchisholm at ca.inter.net
Mon Dec 19 11:57:03 CST 2011
Dear Tom
----- Original Message -----
From: Thomas Reed
To: Discussion of biomass pyrolysis and gasification
Sent: Monday, December 19, 2011 1:29 PM
Subject: Re: [Gasification] TLUD BEST
Tom
When wood reaches 300C, an exothermic reaction takes over, and it goes spontaneously to 400-450 making a charcoal with little absorbtive capacity. The conventional updraft turf covered woodpile makes this type of charcoal.
# Given that the biochar used to make Terra Preta was most likely made in the primitive manner, is there any reason to believe that such charcoal would be bad for use as biochar?
Thanks!!
Kevin Chisholm
TLUD charcoal making requires a temperature > 500C to sustain the PYROLYTIC fire, so makes a charcoal with modest absorb tin capacity. I am anxious to try the blanket or turf covered Pyromid in both TLUD and conventional mode and compare the charcoal properties.
I hope Hugh and Frank will weigh in on this discussion.
Tom Reed
Dr Thomas B Reed
The Biomass Energy Foundation
www.Woodgas.com
On Dec 17, 2011, at 12:40 PM, "Tom Miles" <tmiles at trmiles.com> wrote:
Tom,
Thanks for the observations.
Burning forest slash is CO2 neutral at the very least. The benefits when the charcoal is used in the forest are in soil health and water quality. No doubt there are models that show the net improvement in the carbon cycle from carbonizing slash.
Blanket strips could be used just as you have suggested for the turf. Unlike the turf the blankets could be reused on several piles. The total cost of treatment should be less than using a portable kiln like a modified air curtain incinerator ( www.airburners.com ) or a mobile pyrolyzer to make oil (http://www.advbiorefineryinc.ca/technology/).
The benefit of using the TLUD approach is to have a cleaner burn than a typical earth kiln approach.
You're welcome to come out and stimulate our pyromania.
Happy Holidays
Tom
From: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Thomas Reed
Sent: Saturday, December 17, 2011 8:45 AM
To: Discussion of biomass pyrolysis and gasification; Paul Anderson; Hugh McLaughlin; Kathy Nafie
Cc: knothj at uw.edu
Subject: [Gasification] TLUD BEST
Tom Miles and all
First let me reiterate the warning that TLUD charcoal making is not CO2 negative unless you have also a use for the heat GENERATED in the pyrolysis gas fire. Wood is 50% carbon, and if you get a 20% yield of charcoal, you have put 30% back in the air as CO2 sooner than if the wood rotted. So 1 ton of wood gave 400 lb of charcoal and (1600x44/12) 5.87 tons of CO2 into the atmosphere.
Unless you cook or generate electricity with the heat, in which case you are doubly CO2 negative by replacing propane or other fossil fuel for cooking!
<><><>
I like the idea of the blanket, but not the $1500 it would cost and the time it would take to develop. How about TURF.
Classic charcoal at the time of Napoleon ( he burned down the forests to make cannons) involved stacking many cords of wood around a central chimney made of poles and covering it with turf, leaving a smoke hole at the top. Small air entries were made at the base and fires lit. For quite a while the smoke was white as water vapor was expelled amd the wood dried. Then the smoke turned yellow, as pyrolysis began, and finally blue when the charcoal was burning. Then seal the bottom up tight and wait another few days for it to cool. Strip off the turf and you have a beautiful pile of charcoal.
I have been tempted to replicate the above method on a small scale in my back yard next April when we are allowed to burn. But I would substitute TOP LIGHTING with burning off of the pyrolysis gases as they are formed and regulation of the burn rate by adjusting the air inlet holes. Make a TURFTLUD.
I hope you will discuss this with your friends at UW. I would even be willing to fly out for a meeting and maybe small tests if you have a secret burn spot.
Onward to more charcoal with cleaner air.
Tom Reed, Dr. PGas
Dr Thomas B Reed
The Biomass Energy Foundation
www.Woodgas.com
On Dec 17, 2011, at 11:00 AM, "Tom Miles" <tmiles at trmiles.com> wrote:
Tom,
The pyromid looks like a good in-woods approach to converting slash to biochar.
Do you think that the pyrolysis blanket that is being developed by Carbon Cultures (Jenny Knoth U Washington) can be used to improve the performance of the pyromid?
See video and story at:
http://www.slideshare.net/sblank/carbon-cultures-corps-final
http://www.igert.org/stories/90
http://depts.washington.edu/bioenrgy/
http://www.myscience.us/wire/turning_slash_piles_into_soil_benefit-2011-washington
Thanks
Tom Miles
From: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Thomas Reed
Sent: Saturday, December 17, 2011 6:43 AM
To: Discussion of biomass pyrolysis and gasification; STOVES
Subject: Re: [Gasification] gasifier type updarft use rice husk
Dear gassers and Stovers
Using any size TLUD device including an open PYROMID, and any junk biomass, we all have easy access to as much charcoal as we could ever need, for the first time in history.
Furthermore, Hugh McLaughlin tells me that, while it's not true activated charcoal, made with steam or CO2 at 800C, it has significant absorption capacity (iodine no 400?) since it is made at 500-800 C. I hope Hugh or Frank will comment.
So we really have no excuse for cleaning up TLUD gas if we wish to.
I'm waiting for a good analysis of TLUD gas. I suspect after cleaning it will have significantly more energy than the typical 5.5 MJ/m3 or 150 Btu/ scf of downdraft Woodgas, since the air fuel ratio for pyrolysis is only 1-1.5, rather than the 3.5 for complete gasification of the cellulose lignin package that is wood. So, as a first guess, with 1/3 the A/F ratio, I'm guessing 3x the energy content, of 4.5 MJ/m3 or 450 Btu/scf. Compare to natural gas at 1000 Btu/ scf.
I'd sure like to see some comments from all you practical guys (and dolls?) out there.
Onward
Tom Reed. Dr WoodGas
Dr Thomas B Reed
The Biomass Energy Foundation
www.Woodgas.com
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