[Stoves] Increasing ND-TLUD riser height accelerates gasification and increases bed temperature

[Jock Gill]

Dean, 

I now place my stoves in a 20 gallon trash can. It makes a perfect windshield. I have had fires survive much stronger gusts than 20 mph.

The trash can is also a safety device that catches burning material should the stove fall over .  I can also rest a cooking grate on the top of the trash can. Handy.

Note: zero holes are required in this outer can. The ND TLUD pulls the air down into the unit for both the primary and secondary air. The air supply is thus some what pre-heated before it enters the stove.

I had initially thought I would need air holes in this outer can. But experience shows very clearly that  they are not needed at all.

I have previously posted a PDF of my ican in a trash can. I can repost if necessary.

Cheers,

Jock

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

google.com/+JockGill

Extract CO2 from the atmosphere!

> On Dec 12, 2014, at 2:42 PM, Dean Still <deankstill at gmail.com> wrote:
> 
> Hi All,
> 
> The problem with smoke at the transition from wood to charcoal forced us to add so much primary (bottom) air that the charcoal then burned up resulting in no bio-char. If we wanted bio-char, not using the charcoal for cooking, we added a valve to turn off the bottom air. Not a big deal.
> 
> Yes, charcoal burns hot. But so does the fire in a TLUD. For long life we had to use refractory ceramic or refractory metals. 
> 
> Another problem was to shield the whole stove so it could be used in 20 mph wind without smoking, etc. We chose 20 mph as a reasonable goal. The wind shield ended up being a full length cylinder with holes around the middle of the perimeter equidistant from the primary and secondary holes in the interior stove.
> 
> Best,
> 
> Dean
> 
> 
> 
>> On Fri, Dec 12, 2014 at 10:39 AM, Julien Winter <winter.julien at gmail.com> wrote:
>> Hi Paul; 
>> 
>> I stand corrected.  This is what you said to me a week or so ago.  You were suggesting a dynamic change.   I have been running static batch runs, and that colored my thinking.
>> 
>> Paul Anderson:  "About height, whether of riser or of chimney:  I recommend some simple experiments when your unit is running.   Have some different lengths of extensions that can be easily placed (not even attached) on top of the current unit.   The additional draft will pull more secondary air and make the flame be LOWER as long as there is control over the entry of primary air.   But if the primary air is free flowing, the primary air will eventually "catch up" with the increased draft, and the flame will become higher than before.   If that is not what you observe, please let me know so I can adjust my thinking."
>> 
>> I will have to give that a go.
>> 
>> 
>> Regards,
>> Julien
>> 
>> -- 
>> Julien Winter
>> Cobourg, ON, CANADA
>> 
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