Air separation method and apparatus combined with a blast furnac

Details Air separation method and apparatus combined with a blast furnac Air separation method and apparatus combined with a blast furnac

1992-03-10

1993-12-07

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

60 3912, 75958, 266155, 266160, 266197, C21B 506

Patent

active

052680193

ABSTRACT:
Air is taken from the air compressor of a gas turbine including in addition to the compressor a combustion chamber and an expansion turbine. The gas turbine drives an alternator. The air taken from the compressor is cooled in heat exchanger to remove heat of compression therefrom. The air is separated in an air separation plant into oxygen and nitrogen. A stream of oxygen is withdrawn from the plant and used in a blast furnace in which iron is made. The off-gas from the blast furnace is a low grade gaseous fuel. It is compressed in compressor which has interstage cooling to remove at least some of the heat of compression. The compressed fuel gas is passed through the heat exchanger countercurrently to the air stream. The resulting pre-heated fuel gas flows into the combustion chamber of the gas turbine and is burned therein to generate gaseous combustion products that are expanded in the turbine. A nitrogen stream is withdrawn in the air separation plant. A part of the nitrogen stream is introduced into the combustion chamber and is expanded with the aforesaid gaseous combustion products, while another part is expanded in a separate expansion turbine.

REFERENCES:
patent: 3304074 (1967-02-01), Atherton
patent: 4557735 (1985-12-01), Pike
patent: 4861369 (1989-08-01), von Bogdandy et al.
patent: 4962646 (1990-10-01), Rathbone
patent: 5076837 (1991-12-01), Rathbone et al.

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