[Stoves] big TLUD

[Crispin Pemberton-Pigott]

Dear Rolf

No idea but you might think of checking out downdraft gasifiers which were
made really big in the coal gasification days.

A related question for Tom Miles: 
What do you think of the possibility of running a steam stream into a TLUD
with the primary air to pass water vapour into the pyrolysis zone to create,
at a lower temperature, H2 and CO. This will have the effect of decreasing
the heat available in the fuel bed and increase the CV of the gas produced.

Alternatively how about soaking the fuel in water briefly to increase the
moisture content a bit, and in the same way increase the % of the total heat
available from the flame. It will sacrifice the temperature 'in the zone'. 

Even though the overall efficiency will drop in terms of total heat
available, by transferring heat out of the pyrolyser (excess heat usually
being wasted) there could be a net gain in the flame area if the CV of the
gas can be increased by, say, half of what is lost to the additional
evaporation and conversion.

This effect was accomplished by spraying water onto the hot coals in a coal
gas plant. It reduced the temperature of the working environment and
increased the CV of the "town gas".

Regards
Crispin

========

Hallo stovers,

after seeing those wonderful blue flames on Dr. Belonio's TLUDs and so many
others, I have often asked myself and around just how big can a TLUD be
built without loosing it's properties.

Anyone has an idea or experience?

Thanks a lot

Rolf