Process for supplying a blast furnace with air enriched in oxygen, and corresponding installation for the reduction of iron ore
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorMaurice Grenier
Life of this patent
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Abstract
There is produced by an air distillation apparatus (4) a desired fraction of air from the stream of air leaving at least one blower (3) of the blast furnace, and there is sent to the blast furnace the oxygen produced by this distillation apparatus. The distillation apparatus comprises an air/liquid oxygen mixing column which operates at about 1 bar above the delivery pressure of the blower (3) and which directly produces the oxygen for enriching the air.
Claims10
A method of supplying a blast furnace with air and oxygen, wherein the oxygen is produced by an air separation apparatus comprising a combination of a double column and a mixing column, the method comprising the steps of:
- compressing a feed flow of air to a first pressure;
- dividing the feed flow into a first flow and a second flow;
- sending said first flow to a said blast furnace at said first pressure;
- sending said second flow to said air separation apparatus at said first pressure;
- and
- operating the mixing column at a second pressure higher than said first pressure to produce gaseous oxygen at said second pressure for supplying to the blast furnace.
A plant for the reduction of iron ore, comprising in combination a blast furnace and an air separation apparatus including a double column having a liquid oxygen outlet connected to a mixing column having an air inlet and a gaseous oxygen outlet, at least one blower supplying a first air conduit leading to the blast furnace and a second air conduit leading to the double column, an air conduit branched from the second air conduit and leading to said air inlet of the mixing column, a compressor in said branched conduit, and a gaseous oxygen conduit leading from the gaseous oxygen outlet of the mixing column to the blast furnace.
Dependencies are inferred from the claim text.