Continuous heating of molten iron obtd. from scrap - in shaft furnace leading to steel-making converter fed with oxygen

摘要

The molten iron is fed directly from a shaft furnace into a separate heating chamber in which fuel, esp. solid fuel, and O2 are added. The scrap may include similar materials, e.g. pre-reduced pellets; and fuel is pref. coke, coal or graphite etc. used as dust, lumps or mouldings. The fuel and O2 may be added to the front hearth of, or a sump in, the shaft furnace. Chamber may be divided into two chambers, esp. a U-shaped chamber. Coke dust is pref. blown into chamber via submerged tuyeres, whereas lumps or broken electrode scrap can be fed downwards onto the melt; coal can be pushed underneath the melt. The O2 is pref. surrounded by ga- or liq.-hydrocarbons and blown through submerged tuyeres in chamber (b) for continuous mfr. of steel. Molten iron at just above the liquidus temp. can be fed from furnace into an adjacent steel making chamber.