Paul,
Fans eliminate the need for risers. Without the fan, you stove lacks
the "pull" of the updraft at the level of the flame. 4 inches of draft
could do the job, but maybe not with the burner head with the hundred
small holes. Try a simple experiment with a riser ring around the
burner top. If not successful, make a burner top like on the Mwoto or
Quad or Champion stoves.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 6/22/2013 7:41 PM, Paul Olivier wrote:
I had no idea that solar and wind were competing so well against
fossil fuel power plants:
/Companies like RWE of Germany and EDF of France are confronting
complex challenges. Their revenue is being hit by dwindling demand for
electricity and by new wind and solar projects that undercut the price
of the energy produced from many fossil fuel plants...
With so much energy coming from renewables, many fossil fuel plants
can no longer compete on price. Despite the upfront costs associated
with green energy projects, they are inexpensive to run...
The rising output and falling prices of green energy may be part of
the problem for fossil fuel generators, but they are part of the
solution for energy consumers. /
Biomass stoves must also gain in prominence within developed
countries. Replacing fossil fuel gas with syngas in modern kitchens
should be a top priority.
Yesterday I tested a super-short reactor (net reactor height of 20
cm). The reactor weighs 1.2 kgs and is made entirely of bright
annealed 304 stainless steel. These pictures were taken right after
the first run:
:
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1567.JPG
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1568.JPG
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1569.JPG
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1571.JPG
I filled the reactor with about four inches of pellets. This gave a
burn time of about 40 minutes. The pellets were easy to light. I
thought for a moment that the unit might work without a fan. But this
was not possible. A fan is still needed.
But the fan that I was using is much too powerful for such a short
reactor filled with pellets. The fan was turning at an incredibly low
speed. It was using surely no more than about a half watt of
electricity. I need a fan of a much lower air resistance - perhaps
only 20% that of the fan that I use on loose rice hulls.
The biochar produced from the rice hull pellets remained in pelleted form:
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1563.JPG
The original rice hull pellets had a diameter of 8 mm. When converted
into biochar, the diameter of the pellets decreased to 7 mm.
The flame was orange, not blue. A few months ago I had tested a 70 cm
reactor completely filled with rice hull pellets of a 6 mm diameter.
Here the flame was blue.
When I run a gasifier on loose rice hulls, small particles of fly ash
are always being emitted from the burner. With pellets, I could not
see any particulate matter.
This gasifier is still a very crude device. However I do believe that
the day is not so far away when small, lightweight gasifiers could
make their way into modern kitchens throughout the world. Just as
fossil fuel power plants are being replaced by solar and wind, stoves
using fossil fuel gas must be replaced by stoves using syngas.
Thanks.
Paul Olivier
--
Dalat
Vietnam
Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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