Ok, here is what I came up with to inject oil and air, and a bit of propane, into my furnace to make the fire.
I used information from Lionel Oliver's great site at http://www.backyardmetalcasting.com/
Basically, air is blown in from the right, oil injected from above, and a little propane in the side to get the fire started.
You will see that I have really done some Rube Goldberg plumbing. I'll try to clean things up a bit someday....but
you know how that goes! BTW, the pipe used here is 1-1/2 inch. The smaller
fittings and pipe are 1/4" and 1/8" size.
Here is the same thing disassembled. The oil injector is just a #60 hole
drilled in a 1/8" brass cap. I cast and inserted an aluminum venturi tube
hoping to boost the airflow around the oil port but I think this may have
actually reduced the air flow into the furnace. The propane injector I salvaged
from a propane powered infrared heater. It just threads into a tapped hole in
the pipe. Pneumatic quick-connects make it easy to attach and remove oil and
propane feed lines.
2012 Update --
I have a new burner. I'm not going to discuss details of this as it is based on a propriatary design
detailed in a book I bought from/by Colin Peck. I will say that the new burner works
quite well and I'm now able to melt iron in my furnace. The book is available at
Colin's website. I highly recommend it.
The Artful Bodger's Home Foundry - http://www.artfulbodgermetalcasting.com/index.html
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