[Gasification] Wood heating in the UK - whole log gasification

[Jason]

To all,

my experience with top feeding systems is keeping the upper ends of the
fuel from pyrolysing too early. A water jacket is a logical solution so the
link to the jetstream is interesting for me as I have not come across that
before.

When taking a look at some of the alternate designs at the bottom of that
wikipedia page I am reminded of one discussion with a judge at the wood
stove decathlon. He advised of the terrible pollution problem from poorly
designed boilers, something I had seen discussed but had not explored in
depth. The Alliance For Green Heat is in the thick of combating the
problem. When the problem of combustion chambers surrounded by water
jackets was explained the problem was immediately apparent, the combustion
just doesn't get hot enough or for long enough to be complete. So yes a
water jacket but its integration into the design has to be carefully
considered. The plans for an ultra clean design are in my head now as a
consequence of that discussion :-)

Jason




On Sat, Dec 28, 2013 at 2:10 PM, Tom Miles <tmiles at trmiles.com> wrote:

> Alex,
>
>
>
> 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.
>
>
>
> Thanks
>
>
>
> Tom
>
>
>
> *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
>
>
>
> 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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