[Stoves] Trying new burner for TLUD's

[Julien Winter]

Hi Marquitusus;

Your burner looks like an interesting idea.   It is worth checking to see
if it will operate under difficult conditions, such as low pyrogas
production from fuel > 12% (wet wt.) moisture.

I have been testing various options such as annular rings for pyrogas,
concentrator disks (not rings cf. Anderson and Wendelbo), and swirls.  The
problems with burners emerge with the fuel I described above.  What I find
is that (1) objects over the top of the TLUD reactor that prevent secondary
air descending toward the fuel bed, and (2) swirls generated near the base
of the gas flame, don't work well under difficult TLUD operating
conditions.  I am going to post the results of experiments on these shortly.

The conclusion I have reached (for the burners I have tested) is that it is
best not to interfere too much with the bottom of the gas flame.

However, once the gas fame is well established, modifying it higher up in
the burner to create turbulence or spread the flame could be a good idea.
Therefore, I think your idea has merit.   If you haven't already done so,
you may want to experiment with the distance your disk is above the
secondary air intake, i.e. is there sufficient space for the gas flame to
expand.


Based on the work by

Birzer, C; Medwell, P; Wilkey, J; West, T; Higgins, M; MacFarlane, G; Read,
M.  2013.  An analysis of combustion from a top-lit up-draft (TLUD)
cookstove.  Journal of Humanitarian Engineering, 2(1).
http://www.ewb.org.au/jhe/index.php/jhe/article/view/11

you should check to see that the size of your disk, relative to the burner
outer diameter, doesn't slow down the TLUD reaction too much.


All the best,
Julien.

-- 
Julien Winter
Cobourg, ON, CANADA
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