[Stoves] Fine particles as fuel in TLUDs

[Jock Gill]

Marc,

I have also done this.  I place feedstock in a smaller can that only has a few holes in its lid to allow the pyrolytic gases to escape and burn.  I then place this, as you did, in a larger can used as a ND TLUD and surround the smaller can with fuel.  This creates a retort within a TLUD.  The TLUD will burn some of the charcoal it has made in order to finish the pyrolysis in the inner retort can.  

I find, contrary to the given wisdom, that the inner "retort" can be placed with in the TLUD with the gas escape holes facing UP.  This allows students to see the gas come out and ignite.  If they can see the flames created by the gas coming out of the retort it much more powerful  educational experience.

Well done,

Jock

Jock Gill
P.O. Box 3
Peacham,  VT 05862

Cell: (617) 449-8111

google.com/+JockGill

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> On Feb 12, 2015, at 5:07 AM, Marquitusus <marquitusus at hotmail.com> wrote:
> 
> Hi, in the mids December I consulted the list about my problems with almond husks as TLUD's fuel.
> The problem is the smaller particles of this fuel obstruct the primary air flow and the pyrolisys stops.
> 
> Kirk suggested me using the "can method": just screening the fuel and use the smaller fraction for filling a can that will be put inside the reactor, surrounded by the large particles fraction. I recently tried this method, and it really worked! You can see pics here: http://cuinessolars.jimdo.com/cuines/cuines-gasificadores/
> 
> So, this opens the door for using any size of fuel in a ND-TLUD, from rice hulls to saw dust or any other little particles fuel ( I understand that in a FD-TLUD is not necessary, because of the forced air draft). Also, this method can allow to shorten the size of the chimneys or risers, because less draft is necessary.
> 
> The bad news are we need a can (that is exposed to high temps that will deteriorate it) and we need to previously screen the fuel, but I think these are minor handicaps compared to the benefits it brings
> 
> Marc
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