[Gasification] Gasifier Internal Examination on Video

[jim mason]

On Wed, Mar 19, 2008 at 12:38 AM, Greg Manning <a31ford at inetlink.ca> wrote:
>
>   Greetings everyone.
>
>   I've composed a 24 minute video clip of an internal examination of a
>  downdraft woodchip gasifier's contents, after a 2 hour burn (But must give
>  Doug Williams of Fluidyne NZ. credit for the method).
>


i finally was able to was able to go through these post run forensic
videos and want to thank greg for posting them.  this is a very useful
tool for communicating run particulars and principles.  i hope others
of us will return similar to the common pool.  i'll try too soon also.

a couple notes.

the method of progressively vacuuming out the chips is good.   we've
always done it by hand, and disrupt things much more significantly in
the process.  i like the vacuum method much better.

the differing vertical vs horizontal orientation of the chips was
interesting.  i have never noticed that with the fuels i run.  but it
makes much sense for elongated chips.

i get a similar brown char in high temp areas in constriction/nozzle
type downdrafts.  not in open core.  actually, it seems to go towards
slag as the temp goes up.   i get the start of kaleidascopic crystals
forming on the air inlet heat exchange tubes right at the end of the
reduction tube, on top of the grate.  it seems to be the beginning of
slagging, but not yet into the problem ranges.  i generally been
enthusiastic about this as it seems to argue the combination of
geometry, air preheating and good insulation are producing very high
temps in the combustion and reduction zones.  i haven't instrumented
this area yet so do not have temp figures.

does anyone have thoughts they want to share on what the char colors mean?

greg well shows the tar/char caking behind and between the nozzles we
were discussion awhile ago.  the degree to which this is permeable
under temp still seems an open question to me.  many packed granular
masses are still very permeable.  whether an added outside current
control tube to prevent passive convetion flows would do anything
significant is similarly unknown.  we need to be testing for tar over
various load ranges to know much about this and other admitedly more
important questions.  (note, i am not highly invested in this
scenario.  it just seems interesting.  i have no performance claims
with data i can offer).

the aguadas tar testing scheme is very easy to set up and more of us
need to use it for meaningful comparison at a range of gas flow loads.

thanks again for the videos greg.  they were very helpful.  i now owe
a similar one.

jim





On Wed, Mar 19, 2008 at 12:38 AM, Greg Manning <a31ford at inetlink.ca> wrote:
>
>   Greetings everyone.
>
>   I've composed a 24 minute video clip of an internal examination of a
>  downdraft woodchip gasifier's contents, after a 2 hour burn (But must give
>  Doug Williams of Fluidyne NZ. credit for the method).
>
>   I let it cool, and opened it up in a special way, as to do a "forensic"
>  analysis of what and why, with a narration by yours truly.
>
>   The posts (3) on youtube.com are:
>
>
>   Part one:
>  http://www.youtube.com/watch?v=2sCFpCpSTqE
>
>
>   Part two:
>  http://www.youtube.com/watch?v=JkyuMqDrpAo
>
>
>   Part three:
>
>  http://www.youtube.com/watch?v=arKLqwxbDqI
>
>
>   Regards,
>   Greg Manning
>   Brandon, Manitoba, Canada
>
>
>
>
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>
>
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-- 
--------------------------------------------------------------------------------
jim mason
website: www.whatiamupto.com
current project: mechabolic (http://www.mechabolic.org)
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