[Stoves] Fabricated Burn Barrel TLUDS

[Paul Anderson]

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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