Blast furnaces are used to reduce iron into cast iron by blowing in oxygen. And how does the gas flow entering the furnace move during the heat transfer process?
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Edward Vojcak
Thru "tuyeres" (holes) above the iron filling hearth and charge above - the hot air blast "supports" the weight of the charge above but allowing the dense liquid iron to fall as drops into the hearth.
Hot air is used though pure oxygen injection increases production it also can melt the tuyeres holes and other furnace components.
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Mikhail Suvorov
Gas inside BF moves from lower to upper part of BF penetrating between pieces and droplets inside pushed by higher pressure in lower part.
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