[Stoves] Gasifier Internal Examination on Video

[John G Johnston III]

Hi Greg -

Great videos!

Also, and do not know if this has any relevance to your temperature
measurements, but BS 2790:1992 "Specification for Design and manufacture of
shell boilers of welded construction, Appendix C Calculation of tube plate
temperatures" when talking about measuring gas temperature at the tube plate
says:

"The gas temperature t sub G at the tube entry shall be the true value as
would be measured by a multishield high velocity suction pyrometer (an
ordinary thermocouple will always read low; error may be up to 300 degrees
C)."

Perhaps some of the low reading comes for being in proximity of the
relatively cooler tube plate but that is just a guess on my part.

- John

> -----Original Message-----
> From: stoves-bounces at listserv.repp.org [mailto:stoves-
> bounces at listserv.repp.org] On Behalf Of Greg Manning
> Sent: Wednesday, March 19, 2008 2:38 AM
> To: A Gasification (E-mail); A Stoves (E-mail); A WoodGas (E-mail); A
> Woodheat (E-mail); Woodgasbuilders at Yahoogroups. Com (E-mail)
> Subject: [Stoves] Gasifier Internal Examination on Video
> 
> 
>  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.
> 
>  At the end I show a "before" (what the gasifier was doing before the
> examination, and then after small changes, what the gasifier does after
> the
> examination).
> 
>  The unit now repetitively has hit it's mark of 800c on 3 tests since,
> so I
> would have to say that the exam was well worth it.
> 
>  Another thing to note is that the 3 tests since, have all been with no
> other intervention on the system other than a simple shutdown, and then
> a
> restart 10 hours later and running the gasifier for a 2 hour test
> again,
> with the existing configuration. (simply adding more woodchips to the
> top as
> needed, between tests, no cleaning, or shaking of the stationary unit).
> 
>  I had to break the clip into 3 parts to post it on youtube, but if
> someone
> wants the entire thing on a CD, I can burn them a copy from the
> original
> file.
> 
> 
>  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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> 8:10 AM
> 
> 
> 
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