[Stoves] Heavy metal-pipe gasifier Re: Idea for cooking on a TLUD

[Paul Anderson]

Cripsin,

The metal-pipe version you described could have some practical 
implications for use with biomass as well as coal.

We will assume that scrap pipe is available and cheap.

Pipe will withstand the corrosion well.

Pipe of such dimensions will be emptied / cleaned at a door on the side 
near the bottom (or with a trap-door through the bottom which would be 
more involved and require legs/supports.)  There would be no allowance 
for tipping over to dump out char or ash.

The empty unit will stay hot/ warm for quite a while, so it probably 
should not be reloaded and reignited as a TLUD / MPF unit right away.   
(We lack experience about this.)

After a TLUD operation with MPF (migratory pyrolytic front), the fire 
will be at the bottom.   The unit COULD be continuously feed additional 
fuel from the top, opperating as a traditional updraft gasifier.   Note 
that this would be bottom burning like an incinerator, which generally 
causes worse emissions unless additional adjustments are made.   The 
entry points and amounts of air (primary and secondary) can greatly 
impact this performance. For some societies and situations, this might 
be appropriate.

REQUEST:
Who has conditions to do the development work about this type of 
device?   NOT a tinsmith's job!!!  Please volunteer.   Or make a request 
for some minor financial assistance.

Remember that this can have significant usefulness in colder climates 
where room heating is also of value.

Crispin's time in Tajikistan is limited.   We need some continuity.   
Maybe a team effort.   We can start by bringing together the various 
messages about this, including Crispin's photos.

I will participate, but I do not work alone any more.  Make yourself 
known!!!

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 3/13/2016 3:25 AM, Crispin Pemberton-Pigott wrote:
> Dear TLUD Cookers
>
> This is a top view of the cooking space on the Tajiki TLUD. The large 
> circle is 2.7mm mild steel sheet and the hole is made with a plasma 
> cutter. The diameter of the hole is such that the top edge of the 
> rather thick walled body serves as a holder for the cut-out.
>
> This deletes the usual ring that normally has to be cut separately and 
> welded ‎under the outside diameter.
>
> Using a plasma (in this case one with a fairly wide kerf - 1.6mm) 
> means the cutout can be used if the hole diameter is pushed out pretty 
> much to the limit‎. It sits on top of the pipe just enough to weld it 
> on (the welding heated the inner edge and discoloured it).
>
> The cutout thus cannot fall into the pipe even though it is 3.2 mm 
> smaller than the hole. The main combustion action is directly under 
> the plate so it gets pretty hot:  >400 ‎C on the upper surface. If a 
> cast iron disk were used it would last longer.
>
> Regards
> Crispin in Urumqi
>
>
>
>
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