Hi Brian,
By necessity, a brief reply.
I will say though, that you can affect the gas quality changing from
suction to blown.
Interesting. I wonder why that would be.
The oxidation lobe changes shape and critical depths of the packed bed,
which in turn changes the reactive speeds of the charcoal, which is in a
constant state of evolution relating to temperature and position in the bed.
Am I correct to assume that your specification of 1,050C is with a
properly designed flare? (Since I now understand that our flare is most
certainly NOT properly designed.)
A basic flare is OK, just so long as the air and gas can be mixed before the
ignition point, other wise the CO reverts to soot inside the flare.
Oh now that is just not fair! That would be very bad form if we have a
nice gasifier but the FLARE was making the gasifier look bad! <sigh>
Well, rebuilding the flare has, thanks to these discussions, become our
top priority.
Even the best filtration system can end up having a particle emission count
over the limits due to bad burner design, despite the fact that prior
analysis shows clean gas.
Am I correct to assume that it goes without saying that everything
downstream from the compressor's regulator is essentially "open pipe".
Obviously even open pipe represents some level of restriction but while we
certainly have gas flow, I wouldn't expect the pressure at the flare
outlet to be markedly different from ambient.
When you talk about using a compressor for air supply, or even a fan, the
gas is still pushed out of the burner nozzle at some sort of velocity.
Without specifics to relate to, aspired air is often just not enough to give
you a good mixing situation at the flare. As you can see from the responses,
some think you are operating under high pressure.
Given this is the first gasifier we've ever built, we would have been
shocked if everything worked perfect straight away. We expected a learning
experience, though we are cautiously pleased with where we are at this
early stage. However, this discussion board has been a huge help all
along. We've been here for awhile, though have not posted much, and many
of the discussions here have been very helpful in our design and assembly
efforts. And though I've not heard from Tom Reed in awhile, a huge
cyber-bouquet of roses (or maybe a big cyber-bucket of nice dry wood
pellets?) to him for the information he has made available through the
Biomass Energy Foundation Press.
To reach the stage of combustible gas can be an exhilarating experience, but
that can lead to a very long stick, with an imaginary carrot on the end. The
importance of what you achieve to satisfy your own needs for heat and power,
should in the first instance be all you need as a motivator, so good luck
with that.
Tom Reed's foresight to save not only his own work, but the historical
documentation has been a blessing to us all, providing an incredible
foundation on which to facilitate biomass studies. Long may it continue.
Doug Williams,
Fluidyne.
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