After many years of designing and custom building kilns I wanted to create a super low tech and totally inexpensive way to fire my Chawan, Yunomi and Guinomi and other Teaware.
I located a small old Duncan electric kiln that I stripped of everything and preserved only the shell. Next I drilled 2 burner ports near the bottom just above the level of the floor. I then cut a flue vent in the lid of the kiln approx. 1.25 times larger than the combined area of the burner ports. I use an old broken kiln shelf as a damper to facilitate reduction. I drilled a small hole through the wall of the kiln to insert a K-Type thermocouple that I use to estimate when to start reduction. I start my reduction at a relatively low temp. @1560F, this start point is necessary for the carbon trap glazes that I use.
I fire using two 5 gallon propane tanks with two venture type burners running of a 12 WC regulator. I fire to ∆10 (2345F) in less than 6.75 hours on 4.9 gallons of fuel.
Take a look at the short video below to see and hear this kiln as it approaches 2300F…Let me know what you think and if you should have any questions.