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Furnace gas temperature
ed dravo - Thursday, March 14, 2013 - 8:53pmCasting propane
I built a new furnace out of ceramic fiber and a reflective ceramic coating material to make the 11 inch diameter furnace more efficient. The fuel is propane from a 20 gal. RV tank entering into the furnace through a 1.5 inch diameter pipe. I started out using a hairdryer to push oxygen into the furnace. The furnace is unable to provide a good melt to a 6" crucible filled with bronze. The color of the crucible is red/yellow, not yellow/white like a high temp burn should be. I switched to a leaf blower motor and had the same problem. Supposedly propane and air burns at 4,000 F+ which should be more than adequate. What's going wrong? I'm thinking of adding O from a welding cylinder.