Ken,
If you haven't already heard of the Jetstream
The wood was loaded into a vertical tube which passed through the water
jacket into a refractory lined combustion chamber. In this chamber the
burning took place and was limited to the ends of the logs. The water
jacket prevented the upper parts of the logs from burning so they would
gravity feed as the log was consumed.
http://en.wikipedia.org/wiki/Jetstream_furnace
Not a chimney powered stove.
Alex
On 27/12/2013 6:47 PM, Jeff Davis wrote:
Hi Ken,
Thanks for the interest!
This is my main unknown as yet, how would a split log combust and
pyrolise, if presented to the ember bed, cut end first. I suspect
that there would be little penetration of heat axially, directly
through the end, because the ring structure presents a tough barrier.
Therefore, most burning would have to come radially, and so air
nozzles would have to be positioned to act radially on the sides of
the log.
OK, I should try cutting the wood at 45 deg instead of 90. Interesting!
In your design, it looks similar to a Rocket, but with the fuel
container near vertical. However, the top loading hatch looks fairly
airtight? - so unlike a rocket, there is no air drawn through fuel.
The next test run will be at almost vertical and more distance between
the tube and grate.
This has only run for short periods of time but once it's burning OK I
have been leaving it up. In the middle of the door is an adjustable
air inlet. It's rusted open because of the nasty acidic coal that was
burned in it for a few years.
Nevertheless it appears to burn well and produces a healthy amount of
good sized charcoal. I would be very interested to know how it copes
with a larger log. Perhaps by way of experiment, one could be loaded,
instead of the 2" material, to see how it fairs - this would be very
useful information.
In due time.
Best wishes,
Jeff
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