[Stoves] New kind of Sawdust stove

[Crispin Pemberton-Pigott]

Dear Paul

Discussions with you on terminology are always entertaining.

The 'draft' part of the terminology does not refer to the air flow it refers to the gas flow.

You are trying to turn a direction of the gas into a direction of the air through the fuel‎.


Nurhuda's wood stove and Prime's pellet stove (both designed by Nurhuda) are TLUD's not because the wood stove has air cross-drafting into the fuel, nor because the ‎pellet stove has air updrafting in a tube, then cross-drafting into the fuel.

They are TLUD,s because gases produced in the fuel are updrafted and combusted vertically above the fuel.

A crossdraft combusted has a horizontal flame. Examples are the Japanese FLOX burners, oil furnaces, GTZ 7 Series (now TJ4 and KG4) and a lot of tube boilers.

An end lit cross draft ELCD is a type of solid fuel crossdraft including the TJ1 and 2, plus the ‎MM2 Mongolian 'traditional' stove.

The characteristic of the fuel being lit on top and the draft ‎pulling the flame up and away from the fuel makes it top lit (according to where it is lit) and updraft (according to the direction of the gas/flames).

The argument that the direction of the air arriving at the combustion site doesn't fly. ‎One would have to recategorize oil furnaces with horizontal flames and horizontal exits depending on whether the air arrived and met the fuel from below, or above, or the side.

Would a Vesto be a downdraft stove? Of course not, the flames are upwards. It is always updraft.  Can it be operated as bottom lit or top lit? ‎Of course. In top lit mode ALL the air is provided from the side and none from below.

A TLUD pyrolyser can be operated on its side. That makes it a cross draft pyrolyser. Similarly it can be operated upside down (town gas) in which case it is a bottom lit downdraft pyrolyser. BLDD.

A good example of changing the air is that a BLDD gasifier can have all the primary air arriving right at the grate from the side. None of the air passes through the fuel.

In the case of the TJ4 the air is all from below and the pyrolysis starts on the bottom of the grate. This allows the stove to burn dust and chips which completely block the air passing through the fuel load.

Altanbek has achieved the same thing: the fuel doesn't permit air to flow through it but has nonetheless achieved a top lit updraft flame. I can't say no one did this before, but certainly I haven't seen one before.

Regards
Crispin




Crispin,      (with apologies to everyone else.)

Come on Crispin, get off it.  You are just causing confusion regarding the estabilished terminology!!!   It is easy to mis-use words and descriptive acronyms, but you of all people should know better about what TLUD signifies.   Do not put yourself down with such silly talk!!

Besides, in your next message (addressed to Andrew and the Listserv), YOU wrote:
It looks and acts like a TLUD but has zero air coming from below.
How can you imply that "zero air coming from below" is somehow an "up draft"?   And then to call it a TLUD?

You are a friend and very talented, but get real.  Please stop confusing the terminology that is getting accepted and understood.

There can be up draft stoves and top lit stoves.   But the acronym "TLUD" is something quite specific, and the migratory pyrolytic front (MPF) is its very distinctive characteristic.  If MPF is not clearly evident, a stove should not be called a TLUD.

Enough.   I hope there is silence about this subject.  But do go ahead and talk about the new kind of Sawdust stove.

Paul‎
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