[Stoves] DIY camping TLUD with walnut shell fuel

[alex english]

Wow. After all the time I spent with TLUDs, I would have described it as
the opposite. The most linear self regulating simple combustion system.
Vive la difference!
Alex
On Jun 16, 2016 8:12 AM, "Jock Gill" <jock at jockgill.com> 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
> Peacham, VT 05862
>
> Cell: (617) 449-8111
>
> Extract CO2 from the atmosphere!
>
> On Jun 15, 2016, at 5:06 AM, Mangolazi <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 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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