[Stoves] Understanding TLUDs, MPF and more. (was Re: Bangladesh TLUD )

[Andrew Heggie]

On Wed, 13 Dec 2017 02:26:52 +0000,Crispin Pemberton-Pigott
<crispinpigott at outlook.com> wrote:

>You are correct: the gasifier that burns charcoal with a descending "fire front" (is that OK with you?) is a TLUD gasifier, not a TLUD pyrolyser.

As Norbert has pointed out there are many top down updraught fires,
but I thought we were discussing "migratory pyrolysis front" which is
fairly specific to the clean burning class of stoves first mentioned
on this list by Tom Reed and Ronal. I only used the term TLUD as it is
commonly understood on this list. As I said I would prefer the term
descending pyrolysis front and I was quite happy with Inverted Down
Draught as Down Draught gasifiers, like imberts  were described as
that and inverting it meant something to me, it also introduced the
principle of gravity being involved which I liked as buoyancy of
offgas and superficial velocity are key to how it works.
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>I object to the attempts to assign a principle of operation, a lighting position, and a burn direction, to one particular implementation of it. Top lit refers to something lit on top. Updraft refers to the direction of air flow.

Yes but in saying that you miss my point, it is the combination of
words that becomes  the common term.
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>It is inappropriate for promoters of TLUD pyrolysers to claim that the term does not/cannot be applied to other devices that are top lit updraft combustors.

So you say, others may differ, I don't worry either way.
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>We need another term for the moving fire front (if you will) that is descending through the fuel in a downwards migrating direction.

Well I'm happy with descending pyrolysis front in the case of
describing these type of stoves. I think descending flaming pyrolysis
front may be possible under very low rates of superficial velocity but
that's another discussion.
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>There is a rule on the internet that once a conversation has descended to the point that one party calls another a Nazi it is time to stop.

Again a wilful misinterpretation of what I was trying to get across.
Godwin's law applies when a comparison is made of someone in the
discussion. I was trying to illustrate  that certain word combinations
are recognised as describing one thing and subsequently that
combination is not used elsewhere. We can leave it at that, there is
enough unkindness and hatred in this world for me to want to add to
it, I don't mind people seeing me as socially inept but wouldn't
deliberately offend anyone reading this list.

Andrew