[Gasification] Wood heating in the UK - whole log gasification
tmiles at trmiles.com
Fri Dec 27 19:10:20 CST 2013
I was thinking of Dick's Jetstream. He employed a lot of good combustion
principles to stick wood burning at a time when we were just migrating from
the "tin wonder" wood stoves.
I didn't realize that there was a Wikipedia page on it.
From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On
Behalf Of Alex English
Sent: Friday, December 27, 2013 4:41 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Wood heating in the UK - whole log gasification
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.
Not a chimney powered stove.
On 27/12/2013 6:47 PM, Jeff Davis wrote:
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
In due time.
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