[Stoves] Reducing smoke with steam

[Crispin Pemberton-Pigott]

Dear Philip

Thanks as usual for the tech info.

For those who did not see the spreadsheet (which was sent directly to those
contributing to the conversation) the excess air is about 75% which I
consider very low for a small stove. The traditional and 'improved' stoves
in Ulaanbaatar are in the 400 to 750% range with correspondingly high CO
levels (from chilling the flame).

There is fortunately huge technical capacity in UB to analyse the coal and
its constituents.  I saw a machine used only for testing the melting
temperature of the ash so keeping the temperature in the vicinity of the
grate below that should deliver a blockage-free burn.

At the moment all the air enters through the coal. In the version I tested
around Johannesburg I had preheated secondary air admitted just below the
grate, but my inclination at the moment is to keep the design ultra-simple
to make it accessible.  The preheated secondary air may be necessary to cool
the combustion chamber but for the moment the materials available are mostly
old steam pipes (miles and miles of them) - thick and really nice to work
with.

Regards
Crispin


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