[Stoves] DIY camping TLUD with walnut shell fuel

Paul Anderson psanders at ilstu.edu
Thu Jun 16 09:12:27 CDT 2016


Jock and all,

I must respectfully disagree.   The TLUD  system can be and usually is 
quite consistent with the steady downward movement of the pyrolytic 
front (MPF).   Primary air control is essential, and can be as small an 
opening as the lead of a pencil.

In comparison with OTHER types of combustion (such as stick-fuel into 
Rocket stoves), the TLUDs are more consistent (unless the stove operator 
is spending much time on tending to the insertion of the wood.)

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 6/16/2016 7:10 AM, Jock Gill wrote:
> Basically a TLUD is a very non linear system.  It is extremely hard to 
> maintain an ideal fuel to air ratio. The hotter it gets, the more gas 
> it produces,  the higher the flames, the hotter it gets. It is hard to 
> create the degree of turbulence for proper mixing. It is hard to 
> maintain useful residence times in the combustion zone. It is a nasty 
> feedback loop that is difficult  to work with.
>
> Se my work with flame retention played and flame deflectors.
>
> Jock Gill
> P. O. Box 3 <x-apple-data-detectors://0>
> Peacham, VT 05862 <x-apple-data-detectors://0>
>
> Cell: (617) 449-8111
>
> Extract CO2 from the atmosphere!
>
> On Jun 15, 2016, at 5:06 AM, Mangolazi <mangolazi at yahoo.com 
> <mailto:mangolazi at yahoo.com>> wrote:
>
>> I've always wondered what causes that towering inferno to occur. I've 
>> had this happen a few times with a tiny tin can stove and with a big 
>> paint can biochar burner. I try to avoid it so my pots don't get 
>> damaged.
>>
>> Is it too much primary air? Lots of wood gas from certain fuels? Fast 
>> gas flow from a tall chimney?
>>
>> Looking at a bunch of papers on TLUDs, it seems there's a trade off 
>> between temperature and burn time. You can throttle primary air to 
>> get a long burn time but temperatures may not get high enough to burn 
>> cleanly, whereas a more complete and hotter burn means the fuel is 
>> turned to char much faster.
>>
>> On June 15, 2016 6:23:02 AM GMT+08:00, neiltm at uwclub.net 
>> <mailto:neiltm at uwclub.net> wrote:
>>> On 14 Jun 2016 at 16:17, Mangolazi wrote:
>>>
>>>> Hi Neil, thanks for the recommendations. I think I'll get one of
>>>> those cheap Chinese stoves to see what they can do. Most of them
>>>> look the same so I assume they're all from the same factory.
>>>
>>> They do seem to be all the same.  The main difference between them is
>>> in
>>> which type of pot support/concentrator top you choose.  There are the
>>> fold out sort, with a gap between top of concentrator and pot of 2cm,
>>> and
>>> the fixed higher rise top (4.5cm) with open side that permits easier
>>> fuel
>>> feeding without removing the pot.  I have both, and now prefer the
>>> latter
>>> as the increased height between secondary air holes and pot makes for a
>>>
>>> slightly cleaner burn, and interferes less with the draught.  It has
>>> closer support points though, although I have yet to suffer instability
>>>
>>> from that.  All the parts between the two stoves, bought years apart,
>>> are
>>> interchangeable.
>>>
>>>> They're
>>>> also rather squat - more power, less run time?
>>>>
>>>
>>> They are squat, but run time really depends on the fuel.  It is about
>>> 10
>>> mins of towering inferno run as a TLUD with dry wood, but double that
>>> and
>>> up to half an hour with moister/denser/larger fuel, and I've read an
>
>
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