Dear Dick
That is a honking great charcoal producer you have there! Biochar Production <http://www.thefarm.winona-mn.us/biochar.html> Given the insulation level and the temperatures, I agree that the steel is going to last a long time. It would also take little in the form of bricklaying skill to line it. Round is easy. Broken face bricks and fireclay cement laid thin would give you a long working life. One guy to ask is Tom Miles of this list. He seems to work on technologies at that sort of scale. I am really interested to hear what yield you get and what happens to the gas. Thanks Crispin
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