Method for producing steel in an integrated metallurgical plant

Patent metadata

Field	Value
Publication number	US-2024271232-A1
Application number	US-202218290516-A
Country	US
Kind code	A1
Filing date	May 11, 2022
Priority date	May 18, 2021
Publication date	Aug 15, 2024
Grant date	—

Abstract

The present disclosure relates to a method for producing steel in an integrated metallurgical plant comprising at least one direct reduction reactor for directly reducing iron ore to give sponge iron, at least one electric furnace for melting the sponge iron to give pig iron or crude steel, at least one blast furnace for smelting iron ore to give pig iron, and at least one converter for refining pig iron to give crude steel. In accordance with the invention, the process gas discharged from the direct reduction reactor is admixed at least partly to the hot blast air and/or at least partly to an optional charging material, said air and/or said material being blown into the blast furnace.

First claim

1 - 9 . (canceled)

10 . A method for producing steel in an integrated metallurgical plant, the method comprising:
directly reducing iron ore to give sponge iron using at least one direct reduction reactor; melting the sponge iron to give one of pig iron and crude steel using at least one electric furnace; smelting iron ore to give pig iron using at least one blast furnace; refining pig iron to give crude steel using at least one converter; discharging process gas from the direct reduction reactor; and admixing the process gas at least partly to at least one of hot blast air and a charging material, the at least one of the hot blast air and the charging material being blown into the blast furnace.

11 . The method of claim 10 wherein the process gas is admixed at least partly directly to the at least one of the hot blast air and the charging material.

12 . The method of claim 10 wherein the process gas is first dehumidified and then admixed as dehumidified process gas at least partly to at least one of the hot blast air and the charging material.

13 . The method of claim 12 , further comprising:
removing CO 2 fraction contained in the process gas or in the dehumidified process gas; and admixing the removed CO 2 as carbon dioxide-free process gas at least partly to at least one of the hot blast air and the charging material.

14 . The method of claim 13 wherein the process gas discharged from the electric furnace is at least one of (i) provided at least partly as fuel gas for firing a reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

15 . The method of claim 13 wherein the integrated metallurgical plant comprises a cokery and wherein the process gas discharged from the cokery is at least one of (i) provided at least partly as fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) is supplied at least partly to the blast furnace.

16 . The method of claim 13 wherein the process gas discharged from the blast furnace is provided at least partly as at least one of (i) fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

17 . The method of claim 13 wherein the process gas discharged from the blast furnace is provided at least partly as fuel gas for firing the reduction gas heater of the direct reduction reactor.

18 . The method of claim 14 wherein at least two discharged process gases are provided at least partly as at least one of (i) fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

19 . The method of claim 15 wherein at least two discharged process gases are provided at least partly as at least one of (i) fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

20 . The method of claim 16 wherein at least two discharged process gases are provided at least partly as at least one of (i) fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

21 . The method of claim 17 wherein at least two discharged process gases are provided at least partly as at least one of (i) fuel gas for firing the reduction gas heater of the direct reduction reactor; and (ii) supplied at least partly to the blast furnace.

Assignees

• Thyssenkrupp Steel Europe Ag

Inventors

• Jäger Nils
• Schubert Daniel
• Weinberg Matthias

Classifications

• Y02P10/122

  by capturing or storing CO2 · CPC title

• C21C2100/04

  Recirculation of the exhaust gas · CPC title

• C21B2005/005

  Selection or treatment of the reducing gases · CPC title

• C21B13/004

  in a continuous way by reduction from ores · CPC title

• C21B7/002

  Evacuating and treating of exhaust gases · CPC title