Marcia Selsor on mon 5 nov 01
Dennis Parks' book on Oil Firing will be reprinted by Axner's and out
this Spring, I believe.
He also has info about a drip system in the old Studio Potter Book or if
anyone has the early issue on alternative fuels, it is in there (1973
green issue)
> Would like to hear from others who've experimented with this sort of
> thing.
> Brad Sondahl
> --
>
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--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/Tuscany2002.html
Dave Finkelnburg on mon 5 nov 01
Brad,
Some commercial applications add oxygen, rather than air, to burn the
fuel. The idea is to avoid having to heat nitrogen, which is about 79% of
air. Putting oxygen with any fuel, is, of course, EXTREMELY DANGEROUS and
should only be attempted under industrial conditions with proper safety
controls.
The volume of flue gas is necessary to let air carry enough oxygen into
the kiln in the to burn the fuel and release enough heat to fire the kiln.
Whether you use natural draft or forced air, you need a molecule of oxygen
for every molecule of carbon burned and an atom of oxygen for every molecule
of hydrogen to release the heat from any hydrocarbon fuel source.
Your idea of a furnace burner may work. At least it would efficiently
release the heat from the fuel.
Good luck with your experimenting.
Dave Finkelnburg, in from watching a rare Aurora in the sky above
southern Idaho
Brad Sondahl on mon 5 nov 01
I've got a retired 7 cu.ft. electric kiln I've been considering
converting to a diesel kiln. The reasoning is this--although most
reduction kilns are gas fired, they require a large tank of fuel or
access to gas lines, and lots of special burners etc. The idea is to
use low tech gravity flow of liquid fuel to a pan inside the kiln where
it would start burning, and let the kiln itself be the burner. This is
probably similar to oil drip burning kilns. I've heard of using
furnace burners, but don't think forcing air through the kiln (which I
think would be a byproduct) is the most efficient way of heating the
kiln (too much heat out the flue). As it is gas firings mostly take so
long due to all the heat going up the flue. I've encountered two
problems, which I expected-- getting the kiln to vent out a down draft
chimney, and getting sufficient oxygen to burn the fuel without a fast
(large)draft.
I've tried getting the draft started by heating the chimney with a
propane torch, and by putting in some fuel. For trial purposes only,
I've dripped fuel through a clay tube into a spoonlike burning area. I
also drilled a 3/4 inch hole at an angle down to it so I could monitor
the burning and for adding oxygen. Unfortunately these steps have still
resulted in death by CO and CO2. I'm guessing I need a larger primary
air intake (I already expanded the chimney hole to about 2" in diameter.
Would like to hear from others who've experimented with this sort of
thing.
Brad Sondahl
--
For original art, music, pottery, and literature, visit my homepage
http://pages.about.com/bsondahl
Pottery homepage http://sondahl.freeyellow.com
New music site at mp3.com http://www.mp3.com/sondahl
Marcia Selsor on tue 6 nov 01
Dear Brad,
If you try furnace burners, read my article in the Old Studio Potter
Book about converting oil furnace burners for kilns. It describes adding
various size nozzles for increasing BTU output.
Also describes using a fiber collar on the birner to seal out secondary
air which can cause carbon clinker build up.
Electrodes on the burners are essential for igniting and continued
ignition at low temperatures.
They do work well. Diesel is a hotter fuel (more BTUs per gallon) than
gas natural or propane.
Marcia
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/Tuscany2002.html
GlassyClass on wed 7 nov 01
http://www.pacificsun.ca/robert/www/oilburner/oilburners.htm
Was searching for kiln burners, and came across this. Might be helpful for
what you are looking at.
Bud
----- Original Message -----
From: "Brad Sondahl"
Sent: Monday, November 05, 2001 4:55 PM
Subject: Diesel etc. fired kiln idea
> I've got a retired 7 cu.ft. electric kiln I've been considering
> converting to a diesel kiln. The reasoning is this--although most
> reduction kilns are gas fired, they require a large tank of fuel or
> access to gas lines, and lots of special burners etc. The idea is to
> use low tech gravity flow of liquid fuel to a pan inside the kiln where
> it would start burning, and let the kiln itself be the burner. This is
> probably similar to oil drip burning kilns. I've heard of using
> furnace burners, but don't think forcing air through the kiln (which I
> think would be a byproduct) is the most efficient way of heating the
> kiln (too much heat out the flue). As it is gas firings mostly take so
> long due to all the heat going up the flue. I've encountered two
> problems, which I expected-- getting the kiln to vent out a down draft
> chimney, and getting sufficient oxygen to burn the fuel without a fast
> (large)draft.
> I've tried getting the draft started by heating the chimney with a
> propane torch, and by putting in some fuel. For trial purposes only,
> I've dripped fuel through a clay tube into a spoonlike burning area. I
> also drilled a 3/4 inch hole at an angle down to it so I could monitor
> the burning and for adding oxygen. Unfortunately these steps have still
> resulted in death by CO and CO2. I'm guessing I need a larger primary
> air intake (I already expanded the chimney hole to about 2" in diameter.
>
> Would like to hear from others who've experimented with this sort of
> thing.
> Brad Sondahl
> --
> For original art, music, pottery, and literature, visit my homepage
> http://pages.about.com/bsondahl
> Pottery homepage http://sondahl.freeyellow.com
> New music site at mp3.com http://www.mp3.com/sondahl
>
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