[Stoves] DIY camping TLUD with walnut shell fuel

[Mangolazi]

Hi Kirk, my tin can stove is similar to yours except I don't have large secondary holes on top. I use wire mesh to hold up the pot. 

I added a flame disk made from an aluminum beer can just below the pilot holes (see attached pix). Burn time didn't change but flame height was lower than before. Without the cover and concentrator hole, the flame was as wide as the can mouth.

There was a lot of turbulent flow just above the disk. I also saw a lot more blue flame than before, a sign of hotter and more complete combustion? I might try a fan shaped obstructor later, like with your Strata burner. Good stuff... 


On June 15, 2016 12:48:13 AM GMT+08:00, kgharris <kgharris at sonic.net> wrote:
>Mangolazi,
>
>Reducing the flame on a TLUD can be difficult.  The reduced gasses are
>cooler than the high power gasses and are further cooled and diluted by
>the
>also cooler secondary air.  Eventually the flame goes out.  Several
>(for
>your stove 4 would probably work) small pilot holes drilled perhaps
>1 to 2 cm down from the secondary air entrance will
>feed a little  bit of air into the gas before it is diluted and cooled
>by
>the secondary.  The resulting pilot flames keep flame presence and will
>heat 
>and ignite the
>remaining gas as it enters the secondary area.  It can give more
>turn-down.
>Remember this is for small pilot flames, not the whole secondary flame,
>so
>not to much.
>
>Then you can put some sand or ash around the base of the stove to block
>some
>of the air.  Add and remove sand/ash until the desired flame level is 
>achieved.
>Then add your wind shield.  Once you have a good mixture, you can
>design a
>primary air control if desired.
>
>I have included a photo of my efforts at a backpacking stove.  It is
>not the
>cleanest and not ment to be adjustable, but it is simple, cheap, light
>weight and works great for wilderness camping.  The top of the can is
>the
>pot stand and the wire grate fits inside the bottom of the stove.  This
>way
>you don't need to elevate the stove.
>
>Best,
>
>Kirk H.
>----- Original Message ----- 
>From: "Mangolazi" <mangolazi at yahoo.com>
>To: <stoves at lists.bioenergylists.org>
>Sent: Monday, June 13, 2016 2:28 AM
>Subject: [Stoves] DIY camping TLUD with walnut shell fuel
>
>
>Hi everyone,
>
>I've been messing around with a tiny gasifier based on a peach can for
>camping usage. I can get about 12 minutes flame time using twigs,
>although
>the coals inside keep burning for a lot longer. I can boil 500 ml water
>in 7
>minutes using twigs.
>
>I recently added an outer vessel for windproofing and to preheat the
>secondary air. Using walnut shells, I get a very hot and high flame,
>higher
>than with peanut shells or twigs, with flames reaching almost to the
>top of
>the pot. Total flame time goes up to 14 minutes and 500 ml water boils
>in 6
>minutes, faster than before. Please see attached images.
>
>How can I prevent the flame from going up so high?
>
>Is it possible and feasible to throttle primary air on such small
>stoves?
>
>Has anyone used peanut or walnut shells for daily cooking on a large
>TLUD?
>
>Thanks!
>
>
>--------------------------------------------------------------------------------
>
>
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