🔥 Bloomery Iron Smelting: Boudouard Gas, Wustite Reduction and Furnace Heat (2D)

Cross-section of a charcoal shaft furnace blown by bellows, coloured by temperature, with ore going in and a bloom of iron and slag forming at the bottom. Set the air blast, ore feed and grade, gas contact, furnace size and wall thickness, and see the hearth temperature, whether the gas can reduce the ore, the iron in the bloom and in the slag, and the iron made per kilogram of charcoal. Gas equilibria, the reduction threshold, the heat balance and the iron bookkeeping are checked numerically, with four in-page numerical checks.