Nils Lou on mon 11 jan 10
Perhaps, Ingeborg, you might consider the height of your stack as it is =3D
a fundamental
element in the firing flux. Especially, as you say it is not the same as =
=3D
you had in Camas.
You wrote:
"This kiln lived in Camas, Washington for a number of years. It was =3D
situated
high on a hill top and worked quite well with only about 1/2 cone =3D
difference
from top to bottom or anywhere else. For me, 1/2 cone is good enough. =3D
In
other words, it functioned quite well. Then I moved to SW Florida.
I disassembled the kiln moved it to St. James City and reassembled it. =3D
All
of the bricks were numbered, lots of pictures taken and I am positive =3D
it is
reassembled correctly. For whatever reason, it has never really been =3D
happy
here in SW Florida. I know the climate is different...hot humid, The
chimney is shorter than in Camas, there are no trees or walls to =3D
interfere
with the draft like in Camas which would seem like a plus. It has never
fired evenly from top to bottom since I've been here and I suspect I =3D
have
created some of the problems by twitching things trying to get it to run
like it used to. Does that make sense? In Camas, the top and middle =3D
were
the same cone and the bottom was a bit colder. Now the top is cold, the
middle hot and the bottom kind of hot and everything else is always a =3D
crap
shoot. I place a lot of cone packs throughout the kiln."
Trees and walls are less important than correct stack height. I address =3D
this=3D20
in my book if you want to read more.=3D20
Also, I'd suggest checking the primary disk on the "sooty" burner. If =3D
the orifice is=3D20
clean and still burns dirty you aren't getting enough air for neutral =3D
combustion.
Compare it with the other burners and see. I'd open the door and turn =3D
all the burners on full
to see the flame structure and have someone adjust the primary air disk =3D
to taste as you
observe. Good luck! nils
nils lou, professor of art
http://nilslou.blogspot.com
www.tinyurl.com/bpc5nm
503.883.2274
"Play is the essence of creativity", and
"What is not brought forward into consciousness....
we later call Fate", Carl Jung
Ingeborg Foco on mon 11 jan 10
Thanks Nils,
I did check the sooty burner air plate and it was closed more than it shoul=
d
be. Have that fixed. I will have to reread you book on stacks but I
honestly don't think I can increase the stack. Presently it is 3' shorter
than in Camas but if I put the other 3' section on....oh my what trouble
during high winds as in hurricane force winds. I am not going to climb up
there and remove a couple of sections every time
a big blow comes. So if it comes down to that, I guess I will have to
settle for a kiln that doesn't fire evenly.
The only reason that additional 3' section was added in Camas was to clear =
a
roof line and wall close to the stack to increase the draft. It draws just
fine as it is here without that extra pipe.
Ingeborg
On Mon, Jan 11, 2010 at 12:19 PM, Nils Lou wrote:
> Perhaps, Ingeborg, you might consider the height of your stack as it is a
> fundamental
> element in the firing flux. Especially, as you say it is not the same as
> you had in Camas.
>
> You wrote:
> "This kiln lived in Camas, Washington for a number of years. It was
> situated
> high on a hill top and worked quite well with only about 1/2 cone
> difference
> from top to bottom or anywhere else. For me, 1/2 cone is good enough. I=
n
> other words, it functioned quite well. Then I moved to SW Florida.
> I disassembled the kiln moved it to St. James City and reassembled it. A=
ll
> of the bricks were numbered, lots of pictures taken and I am positive it
> is
> reassembled correctly. For whatever reason, it has never really been hap=
py
> here in SW Florida. I know the climate is different...hot humid, The
> chimney is shorter than in Camas, there are no trees or walls to interfer=
e
> with the draft like in Camas which would seem like a plus. It has never
> fired evenly from top to bottom since I've been here and I suspect I have
> created some of the problems by twitching things trying to get it to run
> like it used to. Does that make sense? In Camas, the top and middle wer=
e
> the same cone and the bottom was a bit colder. Now the top is cold, the
> middle hot and the bottom kind of hot and everything else is always a cra=
p
> shoot. I place a lot of cone packs throughout the kiln."
>
> Trees and walls are less important than correct stack height. I address
> this
> in my book if you want to read more.
> Also, I'd suggest checking the primary disk on the "sooty" burner. If the
> orifice is
> clean and still burns dirty you aren't getting enough air for neutral
> combustion.
> Compare it with the other burners and see. I'd open the door and turn all
> the burners on full
> to see the flame structure and have someone adjust the primary air disk t=
o
> taste as you
> observe. Good luck! nils
>
>
>
> nils lou, professor of art
> http://nilslou.blogspot.com
> www.tinyurl.com/bpc5nm
> 503.883.2274
> "Play is the essence of creativity", and
> "What is not brought forward into consciousness....
> we later call Fate", Carl Jung
>
--
Sincerely,
Ingeborg
http://www.thepottersworkshop.com
Nils Lou on tue 12 jan 10
I understand the wind in south florida is a big deal, so
perhaps you will find it helpful to remove the cap. if that
doesn't help, take the height down to 12 feet. at 14 feet you
may actually have a null point as the exhaust cycle pulsates
at that point acting exactly like a negative damper. make sure your
exit flue is not so large also. if it's more than 45 square inches
you will have a cold spot in the center bottom which i think you
mentioned having. start with the cap first.=3D20
nils lou, professor of art
http://nilslou.blogspot.com
www.tinyurl.com/bpc5nm
503.883.2274
"Play is the essence of creativity", and
"What is not brought forward into consciousness....
we later call Fate", Carl Jung
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