Blast furnace for ironmaking production

Patent metadata

Field	Value
Publication number	US-2023366047-A1
Application number	US-202018026046-A
Country	US
Kind code	A1
Filing date	Sep 15, 2020
Priority date	Sep 15, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

A blast furnace for ironmaking production wherein iron ore is at least partly reduced by a reducing gas which is injected in the stack of the blast furnace. The blast furnace includes an external and an internal wall, having a thickness T int , in contact with matters charged into the blast furnace. The thickness T int of the internal wall is substantially constant above and below the injection area of a reducing gas.

First claim

What is claimed is:

1 - 6 . (canceled)

7 : A blast furnace for ironmaking production, iron ore being at least partly reduced by a reducing gas injected in a stack of the blast furnace, the blast furnace comprising:
an external wall; an internal wall in contact with matters charged into the blast furnace, the internal wall having a thickness T int ; and an injector for injecting the reducing gas through an injection outlet in an injection area, the thickness T int of the internal wall being constant above and below the injection area; the injection outlet being is aligned with the internal wall; and the injector capable of injecting the reducing gas at a speed inferior to 120 m/s.

8 : The blast furnace as recited in claim 7 wherein the thickness T int of the internal wall is constant over a height of at least 400 mm above and at least 400 mm below the injection area.

9 : The blast furnace as recited in claim 7 wherein the blast furnace has a working height and the reducing gas injection of the injector is performed at a height w between 20% and 70% of the working height H, starting from a tuyere level.

10 : An ironmaking method performed in the blast furnace as recited in claim 7 wherein the reducing gas contains part of top gas exhausted from the blast furnace during the ironmaking process.

11 : The method as recited in claim 10 wherein the reducing gas is injected at a temperature between 850° C. and 1200° C.

12 : The method as recited in claim 10 wherein the reducing gas has the following composition by volume:
65%≤CO≤75%
8%≤H 2 ≤15%
1%≤CO 2 ≤5%

a remainder being N2.

Assignees

• Arcelormittal

Inventors

• Izard Edouard
• Sert Dominique

Classifications

• C21B5/06 Primary

  using top gas in the blast furnace process · CPC title

• C21B7/16

  Tuyéres · CPC title

• C21B5/001 Primary

  Injecting additional fuel or reducing agents · CPC title

• F27B1/14

  Arrangements of linings · CPC title

• F27D1/0003

  Linings or walls · CPC title