[Stoves] Extended burn time in TLUD Chinese camp stoves

[Todd Albi]

General Parameters:  Twigs densely packed 20 - 40 minutes, dense hard wood
vertically packed 45 - 60 minutes, pellets up to 2 hours.  Everything
variable according to density of fuel, species and moisture content.  Old
news, this has been pointed out our our website for over last 5 years, same
as with our larger insulated natural draft TLUDS.  In fact if using
pellets, duration of burn usually far exceeding most practical cooking
operations.  This uninsulated trekking stove was created for on the go
applications for quick heating and cooling applications, as previously
mentioned.  Ultra prolonged cooking times in these little gasifiers was not
the intended application.

Prolonged cooking operations best reserved for insulated and thicker
combustion chamber design TLUD's.  Longer extended burns obviously can be
accomplished with mixing fuels too (lump hardwood charcoal mixed with
wood).  Excellent option for slow grilling and cooking procedures.  It also
can stabilize wood cooking temperatures during prolonged burns.  These
techniques have been used for decades by pit masters and slow cooking
operations for example on Santa Maria grills, etc....  Caution though, keep
wood base below charcoal to minimize contact with floor grate, as charcoal
direct contact with thin walled stove combustion chamber floor bottoms can
result in shortened stove life.   The little trekking stove distortion
shown in this video also impedes collapsing modular design efficiently, as
well as shortening metal stove life .  Bottom line, common sense required.

Todd Albi, SilverFire





On Thu, Apr 5, 2018 at 8:49 AM, <neiltm at uwclub.net> wrote:

> I came across this youtube video by someone claiming a one hour burn time
> with wood in the Chinese wood gas camp stoves:
>
> https://www.youtube.com/watch?v=RdcVqrDMPag
>
> Previous experiments stacking twigs or lengths of wood vertically
> typically made no difference over chunking, snapping and just chucking
> stuff in and shaking it down, but I thought I would try to reproduce what
> was done in the video.
>
> I had some hazel coppice stems which I cut to length and split into
> quarters.  This morning, once thoroughly dried out on top of our gas
> boiler I stacked the chamber much tighter than shown and was immediately
> impressed by how much heavier the stove was over a normal loading.
> Quarter sections like that allow for very efficient loading with minimum
> gaps, but still plenty of room for sufficient primary air.
>
> The 'control' was knowing that the same hazel chunked and zero moisture
> would be a flare up lasting about ten minutes.  What I got was a good
> steady but robust and smokeless flame for between 25 and 30 minutes, and
> no need to refuel as I usually do to complete a breakfast cook.  There
> was some very nice char left over as well.  This is the longest cooking
> time without refuelling I have achieved with this stove, doubling or
> trebling the burn time, but still with a strong fire.  Definitely scope
> there for an air dried moisture content to prolong the burn still further
> at a still usable heat output, and presumably what the author of the
> video did, though she doesn't say.
>
> More fuel preperation involved, but not hard to imagine sustainably
> growing and coppicing wood like hazel, chopping it green in a suitable
> guillotine with a measured stop, and possibly even a simple held blade
> for more even splitting with a hammer.  I seem to recall one of Dr
> Nurhudu's videos showing similar neat vertical stacking of split wood in
> the wood version of the Prime stove, so can definitely appreciate the
> advantages now of vertical stacking, but it must be tight packed split
> wood to confer the extended duration advantage.
>
> Neil Taylor (emerging into a mostly very wet English spring)
>
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