Method for operating an iron- or steelmaking- plant
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsPhilippe Blostein, Mike Grant
Life of this patent
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Abstract
A method of operating an ironmaking or steelmaking plant with low CO2-emissions is provided. Hydrogen and oxygen are generated by water decomposition and at least part of the generated hydrogen is injected as a reducing gas into one or more ironmaking furnaces with off-gas decarbonation and reinjection into the furnaces of at least a significant part of the decarbonated off-gas and at least part of the generated oxygen is injected as an oxidizing gas in the one or more ironmaking.
Claims15
A method of operating an ironmaking or steelmaking plant comprising an ironmaking furnace set comprising one or more furnaces in which iron ore is transformed into liquid hot metal by means of a process which includes iron ore reduction, melting and off-gas generation, the ironmaking or steelmaking plant, the method comprising the steps of:
- a. charging the ironmaking furnace set with iron ore and coke,
- b. injecting oxidizing gas into the ironmaking furnace set,
- c. producing an off-gas and decarbonating the off-gas downstream of the ironmaking furnace set thereby obtaining a CO2-enriched tail gas stream and a decarbonated off-gas stream containing not more than 10% vol CO2,
- d. injecting at least 50% of the decarbonated off-gas stream back into the ironmaking furnace set as a reducing gas recycle stream,
- e. generating hydrogen and oxygen by means of water decomposition,
- f. injecting at least part of the hydrogen generated in step in step (e) combined with at least a part of the decarbonated off-gas into the ironmaking furnace set, and
- g. injecting at least part of the generated oxygen into the ironmaking furnace set and/or a converter as oxidizing gas.
Dependencies are inferred from the claim text.