Iron ore reducing and melting apparatus and method
AssigneePaul Wurth S.A.
InventorsKlaus Peter KINZEL, Fernand DIDELON, Mehdi BANIASADI, Evangelos DELIKONSTANTIS, Jihong JI
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Abstract
An iron ore reducing and melting apparatus includes a furnace including from bottom to top: a hearth, a tuyere level, a shaft level and a top level, the blast furnace including at least one first gas injector on the tuyere level, at least one first reducing gas generator connected to the at least one first gas injector, wherein the apparatus is adapted to provide reducing gas including 30-100% (vol/vol) hydrogen on the tuyere level and to operate at a coke rate of below 200 kg/t hot metal.
Claims26
An iron ore reducing and melting apparatus, comprising:
- a furnace comprising from bottom to top:
- a hearth, a tuyere level, a shaft level and a top level, wherein the furnace comprises at least one first gas injector on the tuyere level;
- and
- at least one reducing gas generator connected to the at least one first gas injector, wherein the at least one first gas injector is adapted to provide reducing gas comprising 30-100% (vol/vol) hydrogen, having a density of 0.15-0.85 kg/Nm3 and a mass flow rate of 300 to 800 kg/tHM or/and a volume flow rate of 500-1300 Nm3/tHM on the tuyere level, and to operate at a coke rate of below 200 kg/t hot metal.
A method for reducing and melting iron ore in a furnace, the method comprising the steps of:
- injecting a superheated reducing agent at a temperature of 1600° C.-2600° C. into the furnace at tuyere level;
- wherein the volume flow of the reducing gas injected at tuyere level is 500-1300 Nm3/t hot metal and the reducing gas comprises 30-100% (vol/vol) H2, has a density of 0.15-0.85 kg/Nm3, and a mass flow rate of 300 to 800 kg/tHM or/and wherein the coke rate of the method is below 200 kg/t hot metal;
- and
- thereby providing hot metal.
Dependencies are inferred from the claim text.