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US 12,060,622 B2Granted
Direct reduced iron system and method
AssigneeNucor Corporation
InventorsBrad True, Lindsay Leveen, Mirmohammadyousef Motamedhashemi
Life of this patent
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Abstract
A method of direct reduction of iron (DRI) is disclosed, the method comprising generating metallic iron by removing oxygen from iron ore using a reducing gaseous mixture with excess carbon monoxide that produces an excess CO2 by-product is provided. CO2 by-product is optionally sequestered. A system for carrying out the method is also disclosed.
Claims11
A direct reduction of iron (DRI) system comprising:
- a partial oxidation unit (PDX) configured to produce a reducing gaseous mixture;
- a direct reduction unit configured to receive a source of iron ore and the reducing gaseous mixture feed comprising at least hydrogen and/or carbon monoxide;
- a scrubber unit configured to receive a top gas feed from the direct reduction unit,
- a top gas separator unit to receive the top gas feed from the scrubber unit and to provide a carbon dioxide by-product feed and an unreacted hydrogen and carbon monoxide feed,
- a process gas separator unit configured to receive the unreacted hydrogen and/or unreacted carbon monoxide from the top gas separator unit and to provide a carbon monoxide feed and an essentially pure hydrogen feed;
- a CO2 geological sequestering unit configured to receive the carbon dioxide by-product feed from the scrubber unit;
- and
- a hydrogen storage unit configured to receive and store the essentially pure hydrogen feed.
5 more elements
A retrofit system for a direct reduction of iron (DRI) unit comprising:
- a partial oxidation unit (PDX) configured to produce a reducing gaseous mixture;
- a scrubber unit configured to receive a top gas feed from a direct reduction unit, the top gas feed resulting from the reaction of the reducing gaseous mixture and iron ore in the direct reduction unit,
- a top gas separator unit to receive the top gas feed from the scrubber unit and to provide a carbon dioxide by-product feed and an unreacted hydrogen and carbon monoxide feed,
- a process gas separator unit configured to receive the unreacted hydrogen and/or carbon monoxide from the top gas separator unit and to provide a carbon monoxide feed and an essentially pure hydrogen feed;
- and
- a CO2 geological sequestering unit configured to receive the carbon dioxide by-product feed from the scrubber unit;
- and
- a hydrogen storage unit configured to receive and store the essentially pure hydrogen feed from a pressure swing absorption unit or a cryogenic unit.
5 more elements
Dependencies are inferred from the claim text.