Steelmaking method and associated network of plants

Patent metadata

Field	Value
Publication number	US-2025034669-A1
Application number	US-202118716603-A
Country	US
Kind code	A1
Filing date	Dec 16, 2021
Priority date	Dec 16, 2021
Publication date	Jan 30, 2025
Grant date	—

Abstract

A steel manufacturing method includes the steps of producing direct reduced iron in a direct reduction plant ( 1 ) using a syngas ( 70 ) resulting from the gasification of solid waste fuels, producing hot metal ( 22 ) and a blast furnace top gas ( 21 ) in a blast furnace ( 2 ) using a hot blast ( 20 ), the blast furnace top gas ( 21 ) being at least partly ( 21 A) used into the direct reduction plant ( 1 ) and producing molten metal and electric furnace gas in an electric furnace ( 3 ) using the produced direct reduced iron ( 12 ). Associated network of plants.

First claim

1 - 16 . (canceled)

17 : A steel manufacturing method comprising the steps of:
a. producing direct reduced iron and a reduction top gas in a direct reduction plant using a reducing gas including a syngas resulting from the gasification of solid waste fuels, b. producing hot metal and a blast furnace top gas in a blast furnace using a hot blast, the blast furnace top gas being at least partly used in the direct reduction plant; and c. producing molten metal and electric furnace gas in an electric furnace using the produced direct reduced iron.

18 : The method as recited in claim 17 further comprising a step of producing coke and a coke oven gas in a coke plant, the coke being charged into the blast furnace for the hot metal production step, the coke oven gas being at least partly used as the reducing gas in the direct reduction plant.

19 : The method as recited in claim 17 wherein the reducing gas further includes green hydrogen.

20 : The method as recited in claim 18 wherein the coke oven gas is at least partly used as hot blast in the hot metal production.

21 : The method as recited in claim 17 wherein the reduction top gas is at least partly used as reductant in the hot metal production.

22 : The method as recited in claim 21 wherein the reduction top gas is injected as reductant into the shaft of the blast furnace.

23 : The method as recited in claim 17 wherein the reduction top gas is at least partly recycled within the direct reduction plant as part of the reducing gas.

24 : The method as recited in claim 17 wherein the syngas has a composition which fulfils a ratio reductants versus oxidants calculated as (% H2+% CO)/(% H2O+% CO2) higher than 10, and a ratio % H2/% CO>1.

25 : The method as recited in claim 17 wherein the blast furnace top gas is at least partly recycled within the blast furnace as part of the hot blast.

26 : The method as recited in claim 17 wherein blast furnace top gas is at least partly sent to a chemicals production unit.

27 : The method as recited in claim 17 wherein the blast furnace top gas is used to heat the reducing gas.

28 : The method as recited in claim 17 wherein the blast furnace top gas is used for the gasification of solid waste fuels.

29 : The method as recited in claim 17 wherein the hot metal is used in the electric furnace to produce molten metal.

30 : The method as recited in claim 17 wherein scrap is used in the electric furnace to produce molten metal.

31 : The method as recited in claim 17 wherein all the steps are supplied with renewable energy.

32 : A network of plants comprising:
a. a direct reduction plant producing direct reduced iron and a reduction top gas using a reducing gas; b. a blast furnace producing hot metal and a blast furnace top gas using reductants; c. an electric furnace producing molten metal and electric furnace gas using the produced direct reduced iron; d. a waste gasification plant producing a syngas from the gasification of solid waste fuels; and e. a gas network connecting at least the direct reduction plant to the waste gasification plant and to the blast furnace so that the reducing gas includes at least a part of the syngas and the blast furnace top gas being at least partly used into the direct reduction plant.

Assignees

• Arcelormittal

Inventors

• Baquet Gonzalez Ignacio
• Herrero Blanco Ignacio
• Reboul Jean-Luc Didier

Classifications

• C21C2100/04

  Recirculation of the exhaust gas · CPC title

• C21B13/0073

  Selection or treatment of the reducing gases · CPC title

• C21B5/06

  using top gas in the blast furnace process · CPC title

• C21B2100/80

  Interaction of exhaust gases produced during the manufacture of iron or steel with other processes · CPC title

• C21C5/527 Primary

  Charging of the electric furnace · CPC title