Method of producing direct reduced iron with use of coal-derived gas and apparatus
AssigneesKabushiki Kaisha Kobe Seiko Sho, Babcock-Hitachi Kabushiki Kaisha
InventorsTakuo Shigehisa, Jinichi Tomuro, Eiichiro Makino
Life of this patent
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Abstract
In a method of producing direct reduced iron with use of a coal-derived gas, coal is heated to lower the moisture thereof, and the moisture-lowered coal is gasified in a coal gasification furnace to produce a coal-derived gas containing a reducing gas. The reducing gas is then utilized to reduce iron ore in an iron ore reducing furnace. With use of an exhaust gas from the iron ore reducing furnace, the coal is heated in the step of heating coal.
Claims19
A method of producing direct reduced iron with use of a coal-derived gas, comprising steps of:
- heating coal to lower the moisture of the coal;
- gasifying the moisture-lowered coal in a coal gasification furnace to produce a coal-derived gas containing a reducing gas;
- reducing iron ore by utilizing the reducing gas in an iron ore reducing furnace;
- and
- delivering exhaust gas from the iron ore reducing furnace to the coal to be heated wherein, in the step of heating coal, the coal is heated with heat from the exhaust gas from the iron ore reducing furnace.
A method of producing direct reduced iron with use of a coal-derived gas comprising steps of:
- gasifying coal in a coal gasification furnace to produce a coal-derived gas containing a reducing gas;
- depressurizing the coal-derived gas by a power recovery apparatus;
- and
- reducing iron ore by utilizing the reducing gas in the depressurized coal-derived gas in an iron ore reducing furnace.
A system for producing direct reduced iron with use of a coal-derived gas comprising:
- a moisture adjuster which lowers the moisture of coal;
- a coal gasification furnace which gasifies the moisture-lowered coal to produce a coal-derived gas containing a reducing gas;
- an iron ore reducing furnace which reduces iron ore by utilizing the reducing gas;
- and
- an exhaust gas utilizer which receives an exhaust gas from the iron ore reducing furnace and utilizes heat from the exhaust gas from the iron ore reducing furnace for lowering the coal moisture.
A system for producing direct reduced iron with use of a coal-derived gas comprising:
- a coal gasification furnace which gasifies coal to produce a coal-derived gas containing a reducing gas;
- a power recovery apparatus which depressurizes the coal-derived gas;
- and
- an iron ore reducing furnace which reduces iron ore by utilizing the depressurized gas.
Dependencies are inferred from the claim text.