Andrew,
The "second stage" chamber is a large water tube heat exchanger which,
by design, the flame from the gasifier enters.
It is large enough to accept large wood in the event of an automation
failure of the chip system. In this mode or in combining modes, any
"sophistication" will be lost. Changes in air metering, air mixing and
residence time will compromise combustion quality even before the "air
is shut off". Offgas is likely condensing on/in tubes, chimney and our
atmospheric commons.
Why worry?
Alex
This bit worries me, what happens to the offgas from this pyrolysis of
solid wood once the air supply is shut off?
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