Chris, Heidi, & Brennan on mon 26 sep 05
In response to Paul B.
Yes there are other people out there firing on vegetable oil, not
many but probably a few. I have been researching and building a veggie
fired kiln which I have just finished and am getting ready to fire this
week. It was built around home oil furnace design and theory. It has
eight custom built burners fitted with low angle (30 degrees) nozzles
all attatched to a main air plenum with valves. It has a standard 100
PSI pump to atomize the oil for a clean/efficient burn. My question to
paul would be how he is going to have control over the heat rise with
only two burners. Even with siphon type nozzles if you turn down the
pressure to get a slower temp climb the atomization will be lousy and
probably burn fairly dirty. This begs the question of what type of ware
you intend to fire and wether or not control over the atmosphere is an
issue? Also what kind of chamber are you spaying the oil into and if
into the actual kiln chamber as opposed to a pre-chanber for combustion
is the angle of the spay going to be low enough to not cake up the ware
from being sprayed with oil? The last question I have is how you intend
to ignite the fuel. Do you preheat the chamber or use a spark igniter?
Does this work? Please let me know what you think. Do you have any
suggestions or answers? I am just as interested in the process as you
are and am still searching for better ways.E-mail me at this address
hoptown45@charter.net or post on this thread would love to hear from you
or anyone else with info. Thanks!
Chris Townsend
Underground Pottery
Paul B on tue 27 sep 05
Chris,
thanks for the reply, sounds interesting what you are doing. What kind of
burners do you have on the kiln?
In my situation, the nozzles will atomize the veg oil very well at low
amounts of psi - i know someone who heats their house with only 3 psi with
the same setup. It does seem like i need quite a bit more than that, at
least 10 - 15 since i am heating something much larger than a residential
furnace.
I will vary the amount of air pressure as the main way to control the
burner out put. I have tested this out with one burner in the kiln, and the
more compressed air you use the more powerful the burner fires. I can also
control the flow of oil into the burners with a ball valve at the supply
tank, which gravity feeds the fuel to them; but mainly the compressed air
is used to control flow.
My burners fire from the back into a flame trench with bricks stacked
loosely in a bag wall along the side, so i am not worried about getting oil
all over the pots.
let me know how yours goes and i will do the same. I can send you some
pictures if you like.
thanks,
Paul
| |
|
