Method for producing direct reduction iron

Patent metadata

Field	Value
Publication number	US-2024410027-A1
Application number	US-202218697769-A
Country	US
Kind code	A1
Filing date	Oct 14, 2022
Priority date	Oct 14, 2021
Publication date	Dec 12, 2024
Grant date	—

Abstract

A method for producing direct reduction iron includes reducing an iron oxide raw material by a reducing gas containing hydrogen gas to generate direct reduction iron; removing water from an exhaust gas in the reducing and thus hydrogen gas is separated from the exhaust gas; carbonizing and cooling the direct reduction iron using a cooling gas containing carbon as an element, and separating hydrogen gas and methane gas from an exhaust gas in the carbonizing and cooling, wherein the cooling gas is methane gas, wherein the reducing gas further contains the hydrogen gas separated in the removing and the hydrogen gas separated in the separating, and wherein the cooling gas further contains the methane gas separated in the separating.

First claim

1 . A method for producing direct reduction iron, comprising:
reducing an iron oxide raw material by a reducing gas containing hydrogen gas to generate direct reduction iron; removing water from an exhaust gas in the reducing and thus hydrogen gas is separated from the exhaust gas; carbonizing and cooling the direct reduction iron using a cooling gas containing carbon as an element; and separating a hydrogen gas and methane gas from an exhaust gas in the carbonizing and cooling, wherein the cooling gas is methane gas, wherein the reducing gas further contains the hydrogen gas separated in the removing and the hydrogen gas separated in the separating, wherein the cooling gas further contains the methane gas separated in the separating.

2 . A method for producing direct reduction iron, comprising:
reducing an iron oxide raw material by a reducing gas containing hydrogen gas to generate direct reduction iron; removing water from an exhaust gas in the reducing and thus hydrogen gas is separated from the exhaust gas; carbonizing and cooling the direct reduction iron using a cooling gas containing carbon as an element; and separating CO gas and CO 2 from an exhaust gas in the carbonizing and cooling, wherein the cooling gas contains CO gas, wherein the reducing gas contains the hydrogen gas separated in the removing, and wherein the cooling gas further contains the CO gas separated in the separating.

3 . The method for producing direct reduction iron according to claim 2 , further comprising
producing CO gas by gasifying char or coke with CO 2 gas, wherein the CO 2 gas provided in the producing includes the CO 2 gas separated in the separating, and wherein the cooling gas is the CO gas produced in the producing.

4 . A method for producing direct reduction iron, comprising:
reducing and iron oxide raw material by a reducing gas containing hydrogen gas to generate direct reduction iron; removing water from an exhaust gas in the reducing and thus hydrogen gas is separated from the exhaust gas; carbonizing and cooling the direct reduction iron using a cooling gas containing carbon as an element; separating water from an exhaust gas in the carbonizing and cooling; carbonizing coal to produce a coal carbonizing gas; and separating hydrogen gas, a mixed gas containing CO gas and methane gas, and CO 2 gas from the exhaust gas after the separating and the coal carbonizing gas, wherein the reducing gas further contains the hydrogen gas separated in the removing and the hydrogen gas separated in the separating, wherein the cooling gas is the mixed gas separated in the separating, and wherein, in the carbonizing coal, the coal carbonizing gas is produced using the CO 2 gas separated in the separating.

5 . The method for producing direct reduction iron according to claim 1 ,
wherein a shaft furnace including, in order from a bottom, a direct reduction iron discharging unit that discharges the carbonized and cooled direct reduction iron to the bottom, a cooling gas inlet, a cooling gas outlet, a reducing gas inlet, a reducing gas outlet and a raw material charging unit that charges a raw material, which is the iron oxide, to a top is used, wherein, in the reducing, in a reduction zone between the reducing gas inlet and the reducing gas outlet, the raw material is reduced with the reducing gas to generate the direct reduction iron, wherein, in the carbonizing and cooling in a cooling zone between the cooling gas inlet and the cooling gas outlet, the direct reduction iron is carbonized and cooled using the cooling gas.

6 . The method for producing direct reduction iron claim 2 ,
wherein a shaft furnace including, in order from a bottom, a direct reduction iron discharging unit that discharges the carbonized and cooled direct reduction iron to the bottom, a cooling gas inlet, a cooling gas outlet, a reducing gas inlet, a reducing gas outlet and a raw material charging unit that charges a raw material, which is the iron oxide, to a top is used, wherein, in the reducing, in a reduction zone between the reducing gas inlet and the reducing gas outlet, the raw material is reduced with the reducing gas to generate the direct reduction iron, wherein, in the carbonizing and cooling, in a cooling zone between the cooling gas inlet and the cooling gas outlet, the direct reduction iron is carbonized and cooled using the cooling gas.

7 . The method for producing direct reduction iron claim 3 ,
wherein a shaft furnace including, in order from a bottom, a direct reduction iron discharging unit that discharges the carbonized and cooled direct reduction iron to the bottom, a cooling gas inlet, a cooling gas outlet, a reducing gas inlet, a reducing gas outlet and a raw material charging unit that charges a raw material, which is the iron oxide, to a top is used, wherein, in the reducing, in a reduction zone between the reducing gas inlet and the reducing gas outlet, the raw material is reduced with the reducing gas to generate the direct reduction iron, wherein, in the carbonizing and cooling, in a cooling zone between the cooling gas inlet and the cooling gas outlet, the direct reduction iron is carbonized and cooled using the cooling gas.

8 . The method for producing direct reduction iron claim 4 ,
wherein a shaft furnace including, in order from a bottom, a direct reduction iron discharging unit that discharges the carbonized and cooled direct reduction iron to the bottom, a cooling gas inlet, a cooling gas outlet, a reducing gas inlet, a reducing gas outlet and a raw material charging unit that charges a raw material, which is the iron oxide, to a top is used, wherein, in the reducing, in a reduction zone between the reducing gas inlet and the reducing gas outlet, the raw material is reduced with the reducing gas to generate the direct reduction iron, wherein, in the carbonizing and cooling the direct reduction iron, in a cooling zone between the cooling gas inlet and the cooling gas outlet, the direct reduction iron is carbonized and cooled using the cooling gas.

Assignees

• Nippon Steel Corp

Inventors

• Mizutani Moritoshi

Classifications

• F27D17/30

  Arrangements for extraction or collection of waste gases; Hoods therefor · CPC title

• F27D17/25

  using cyclones · CPC title

• F27D17/00

  Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases · CPC title

• C21B13/0033

  In fluidised bed furnaces or apparatus containing a dispersion of the material · CPC title

• C21B2100/40

  Gas purification of exhaust gases to be recirculated or used in other metallurgical processes · CPC title