[Stoves] [ Misuderstanding of TLUD stoves Re: Refuelable TLUD

[rongretlarson at comcast.net]

Hi list: 

This is to concur with Tom's remarks. 

The other important element of TLUDs, that I often see missing in their definition, is the [easy, trivial] ability to control primary air flow - to achieve a sizeable turndown ratio. Much fuel is wasted when there is either too much or too little primary air. 

Ron 


----- Original Message ----- 
From: "Thomas Reed" <tombreed2009 at gmail.com> 
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>, "paal wendelbo" <paaw at online.no>, "Paul S Anderson" <psanders at ilstu.edu>, "Hugh McLaughlin" <alternaenergy at charter.net> 
Sent: Wednesday, April 13, 2011 4:05:04 PM 
Subject: Re: [Stoves] [ Misuderstanding of TLUD stoves Re: Refuelable TLUD 

Dear Paal and All 

I think that Paal has missed the point of TLUDs. When a pile of wood starts burning at the bottom, most of the fuel will be pyrolysed as the heat passes up through the bed and burned without mixing with air. 

When the fire is lighted on TOP of the fuel, the volatiles burn, leaving a layer of charcoal. Enough of this charcoal will burn to insure drying and ignition of the second layer, same, same, until all of the volatiles from the whole charge have burned, leaving the charcoal behind. 

Bottom lighting is char burning, volatiles escaping. 
Top lighting is volatiles burning, charcoal preserved. 

So TLUD is not connected to the fuel, but to the manner in which air meets the fuel. 

<><><> 

Conventional downdraft gasification uses the draft of an engine to pull air down through a charge of first wood, then charcoal, so can be thought of as a Bottom Lit Downdraft instead of a Top Lit Updraft. That is why I originally called it an "inverted downdraft gasifier" back in 1985 when I first ran it. 

Words are important. 

TOM REED 
Pyrologist 


On Mon, Mar 7, 2011 at 5:05 AM, Paal wendelbo < paaw at online.no > wrote: 






Stovers. 

As far I can see the name TLUD is connected to the fuel and the combustion, and can not be a name of a certain stove. LPG, alcohol and kerosene stoves are all TLUDs and can not be ignited from underneath Reeds, Andersons and Peko Pe will not be TLUDs if some drops of kerosene go through the fuel and ignite at the bottom. The Champion stove can even be ignited from underneath, which probably most user will do if they don’t have access to kerosene since it is more simple. And if you ad some fuel during time of combustion, is no longer a TLUD. 

TLBM- NF and TLBM-FD could probably do, BM stand for biomass, then charcoal and woodstoves will be included in the family if fuel are ignited on top and the refilling is from underneath the glowing. . 

The Peko Pe was originally called Multi Fuel Combustion System MFCS, 

due to the fact more types of biomass fuel could be utilized.and there was no other way to ignite than on top 



With regards Paal W 


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-- 
Dr. Thomas B. Reed 
The Biomass Energy Foundation 
The BioChar Engineering Corporation 
www.WoodGas.com 

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