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Tuyere

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tuyere [twē′yer]
(metallurgy)
An opening in the shell and refractory lining of a furnace through which air is forced.
Tuyere 

a device for supplying an air blast in metallurgical furnaces or for blowing oxygen into metal baths in steelmaking and the smelting of nonferrous metals. In blast furnaces a tuyere is a nozzle with a water-cooled jacket, and in cupolas and water-cooled blast furnaces it is a slit-shaped opening in the wall of the unit. In converters, open-hearth furnaces, and two-bath steel-making furnaces such a device is called a lance; it is a pipe for supplying oxygen that has a tip of special construction and a water-cooled jacket. A mechanism is provided for raising, lowering, and replacing the tuyere. Besides oxygen, powdered materials can be supplied through tuyeres and lances (for example, in the basic oxygen process).
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The Scotch tuyere (A tuyere is a tube, nozzle or pipe through which air is blown into a furnace or hearth.
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These processes are designed for the production of wrought iron (charcoal iron), usually by refining cast iron, occasionally by melting scrap before a tuyere with charcoal for fuel, the product being obtained in a pasty condition, and containing a certain amount of slag, but less than puddled iron.
Charcoal and the General Steel Making Process by Lynette Tyson / Real estate industry community
For example, cupola operators can keep a safety tuyere open to collect any molten metal that escapes in the event of a runout.
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