Open-Hearth Furnace Sample Clauses

Open-Hearth Furnace. It has been almost completely replaced by BOF and EAF steelmaking in many highly industrialized countries.48 The open-hearth furnace (OHF) uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast-furnace iron to liquid steel. The high flame temperature required for melting is obtained by preheating the combustion air and, sometimes, the fuel gas. OHFs vary considerably in size, having been built for heats of 10 to 600 tonnes; the hearth of a 150-tonnes-capacity OHF is approximately 15 metres long and 5 metres wide. Bulk materials, such as scrap, cold blast-furnace iron, ore, limestone, coke, and alloying agents, are charged through the furnace doors in small boxes of one- to two-cubic-metre capacity. The boxes are brought to the OHF on small railroad buggies, and a charging machine then moves one box after another through a door, turns them over, and dumps their contents onto the hearth.
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