You Told Me To Try It - Can't Believe I Haven't Yet ( anthracite coal ~85% carbon - wood typically ~50% by dry weight )

Proper pot belly stoves were designed to burn coal..... but turned right down.... A little bit of heat, small air feed, and warming the place up all night long..... Run a lot of air through it with a strong draft and a gut full of high carbon coal, and you basically have a lower performing blast furnace......