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US 4,363,654 AGranted
Production of reducing gas for furnace injection
OwnerGeoffrey Frederick, Anthony Dwightinventors
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OwnerGeoffrey Frederick, Anthony Dwightinventors
Estimating the term…
A process for producing a reducing gas for a direct reduction or blast furnace which comprises partially oxidizing oil and/or coal and/or coke in the presence of air to produce a gas stream containing hydrogen and nitrogen together with other gases, treating the gas stream to remove substantially all gases other than hydrogen and nitrogen, drying the gas stream if there is water present, subjecting the gas stream to a separation stage, e.g. in a cryogenic separator, to separate a hydrogen-rich gas stream and a nitrogen-rich gas stream, heating the hydrogen-rich gas stream and injecting it into the furnace. In the case of a direct reduction furnace the gas stream may be obtained by partial oxidation of coal and/or oil. In the case of the blast furnace the reducing gas may be derived from the top gas in addition or as an alternative to partial oxidation of coal and/or oil.
A process for producing a reducing gas for direct reduction furnaces and blast furnaces which comprises:
A process as claimed in any preceding claim in which the gas stream is subjected to scrubbing with hot potassium carbonate to remove the acid gas content prior to the separation stage.
A process as claimed in any preceding claim in which the gas stream is subjected to liquid nitrogen washing to remove carbon monoxide in the gas stream prior to the separation stage.
A process as claimed in any preceding claim in which the reducing gas is obtained by partial oxidation of a feedstock selected from the group consisting of coal and oil and combinations thereof, and the hydrogen-rich stream from the separation stage is heated and injected into a direct reduction furnace for the reduction of iron ore.
Dependencies are inferred from the claim text.