[Stoves] Oil drum based TLUD for biochar production and water heating

[Paul Anderson]

Darren,

Good questions.

The extra 1/3rd barrel on top  is not necessary.   See my publicationfor 
several examples without that extra piece.
Barrel-Size Micro-gasification for Combined Heat and Biochar (CHAB) in 
“Mini” Industries
http://www.drtlud.com/?resource=prt12001

Note:     the product named    re:char    is no longer available. Too 
expensive, and it lacked some design qualities.

Adding an outer wall has been done by several persons, and in different 
ways.   One easy way is to take corrugated metal roofing and wrap it 
around the barrel.   Others have taken another 200 liter barrel without 
top or bottom, cut it once lengthwise, stretch it to be slighly larger, 
and use a strip of metal to cover the created gap.

One disadvantage of the double barrel at that size is the difficulty of 
handling the barrel for dumping out the char.   So most people have not 
bothered to put the outer cylinder around the 200 Liter barrel for fuel.

About chimneys and heights:
A.  Consider having the chimney be inside of (or around) the water 
tank.   See slide 11, bottom center photo shows two water heaters with 
heating via the central chimney, with the TLUD placed underneath.   It 
is smaller than the barrel size that you desire, but the principle is 
the same and it can be scaled, such as by having more chimney pipes to 
have more heat transfer to the water:
http://www.drtlud.com/?resource=prt06100      This is from work I did at 
ARTI in India in 2005.

B.  It is totally possible to have the hot flue gases exit the top of 
the barrel-size TLUD, and then have an optional (use of a damper) 
diversion of the gases laterally and even downward to a water heater 
which has a sufficiently tall chimney to have the needed draft (or use 
some sort of fan or induction system to send the heat where you want it 
to go).   But do not have any air leakages that reduce the final draft.

Darren, as you proceed, please keep us informed.   What are you planning 
to do?   It would be really nice to have a your plans and success story 
to tell to others.   I and others will gladly assist, if possible.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 5/5/2016 7:37 AM, Darren wrote:
> Looking to work on a TLUD design based on a standard oil drum 
> (200-litre drum (known as a 55-gallon drum in the United States and a 
> 44-gallon drum in the United Kingdom) to produce biochar from well 
> dried wood.
>
> Ideally the stove would have a short chimney so as not to be too high 
> so that a pot/water tank/oven could be placed above the stove to be 
> directly heated by the flames.
>
> I've had a look about on the internet to see what people have been 
> building - almost all appear to have an extra 1/3rd of a drum on top 
> as an 'afterburner' chamber and a reasonably long chimney on top of 
> this.  Making them rather tall for easily positioning 
> oven/watertank/pots for direct flame heating.
>
> None I have seen have an extra, large metal skin / tube surrounding 
> the barrel to provide secondary air pre heating (as is done with some 
> smaller TLUD designs).  I wonder if adding this could reduce the total 
> working height of the stove.
>
> Looking to make something that is nice and clean burning.
>
> Current ideas include -
>
> * positioning the chimney/riser at one side of the barrel to allow 
> heating on the rest of the metal surface next to the riser - although 
> I suspect a large diameter chimney is required, leaving a hot surface 
> of limited size.
>
> * charging the barrel 2/3rds full with fuel leaving the top 1/3rd 
> empty as an 'afterburner' - having secondary air holes positioned to 
> jet in air at this height.
>
> Interested in any thoughts people have or any efforts people know of 
> oil drum TLUD designs where people are trying to reduce the height, 
> use the heat, or provide heated secondary air.
>
> Best
>
> Darren
>
> see our previous biochar stove at 
> http://www.appropedia.org/Forest_biochar_rocket_stove
>
> .
>
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