Operating method of an iron making installation and associated operating installation

Patent metadata

Field	Value
Publication number	US-11525167-B2
Application number	US-201816619044-A
Country	US
Kind code	B2
Filing date	Jun 15, 2018
Priority date	Jun 16, 2017
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A method of operating an iron making installation is provided, in which waste material is dried using a drying gas, the drying gas including an exhaust gas from a sinter plant, and the dried material is roasted a roasting gas, so as to produce coal and a roasting exhaust gas. An associated installation is also provided.

First claim

What is claimed is:

1. A method of operating of an iron making installation, the method comprising the steps of:
drying waste material using a drying gas, the drying gas comprising an exhaust gas from a sinter plant,
roasting the dried waste material using a roasting gas, so as to produce coal and a roasting exhaust gas,
using the coal as a raw material in an iron making process, and
recycling at least a part of the roasting exhaust gas to the sinter plant.

2. The operating method according to claim 1 , wherein the drying gas comprises at least 50% of the exhaust gas from the sinter plant.

3. The operating method according to claim 1 , wherein the drying gas has a temperature of at least 70° C.

4. The operating method according to claim 2 wherein the sinter plant exhaust gas is mixed with other components to form the drying gas, and has a temperature between 100 and 150° C. when mixed with the other components to form the drying gas.

5. The operating method according to claim 1 , wherein the roasting is performed at a temperature between 200 and 320° C.

6. The operating method according to claim 1 , wherein at least a part of the roasting exhaust gas is used as part of the drying gas.

7. The operating method according to claim 1 , wherein the roasting exhaust gas is used in the roasting step as part of the roasting gas.

8. The operating method according to claim 1 , wherein after the roasting step the coal is subjected to a milling step and milled coal is injected into a blast furnace through a tuyere.

9. The operating method according to claim 8 , wherein the milled coal has a particle size inferior to 10 μm.

10. The operating method according to claim 8 , wherein at least 4% in weight of solid material injected through the tuyere is milled coal.

11. The operating method according to claim 1 , wherein, after the drying step, the dried material has moisture content inferior to 10%.

12. The operating method according to claim 1 , wherein the roasting exhaust gas is injected into an iron making process.

13. The operating method according to claim 1 , wherein the roasting exhaust gas is sent to a power plant.

14. The operating method according to claim 1 , wherein the waste material is an organic waste material.

15. The operating method according to claim 5 , wherein the organic waste material is waste wood.

16. An installation operating the method of claim 1 comprising: a dryer for drying the waste material using the drying gas injected by an injector into the dryer; a roaster for roasting the dried waste material using the roasting gas so as to produce the coal and the roasting exhaust gas; the sinter plant producing sintered material and sinter exhaust gas; a first collector to collect the sinter exhaust gas; a connector connecting the first collector to the injector so as to inject a part of the sinter exhaust gas into the dryer.

17. The installation according to claim 16 , wherein the dryer is a belt dryer.

18. The installation according to claim 16 , the roaster is a pyrolysis reactor.

19. A method of operating of an iron making installation, the method comprising the steps of: drying waste material using a drying gas, the drying gas comprising an exhaust gas from a sinter plant and the exhaust gas from the sinter plant comprises at least 50% of the exhaust gas, roasting the dried waste material using a roasting gas, so as to produce coal and a roasting exhaust gas, and using the coal as a raw material in an iron making process.

20. The operating method according to claim 19 , wherein the drying gas has a temperature of at least 70° C.

21. The operating method according to claim 20 , wherein the sinter plant exhaust gas is mixed with other components to form the drying gas, and has a temperature between 100 and 150° C. when mixed with the other components to form the drying gas.

22. The operating method according to claim 19 , wherein the roasting is performed at a temperature between 200 and 320° C.

23. The operating method according to claim 19 , wherein at least a part of the roasting exhaust gas is used as part of the drying gas.

24. The operating method according to claim 19 , wherein the roasting exhaust gas is used in the roasting step as part of the roasting gas.

25. The operating method according to claim 24 , wherein after the roasting step the coal is subjected to a milling step and milled coal is injected into a blast furnace through a tuyere.

26. The operating method according to claim 25 , wherein the milled coal has a particle size inferior to 10 μm.

27. The operating method according to claim 25 , wherein at least 4% in weight of solid material injected through the tuyere is milled coal.

28. The operating method according to claim 26 , wherein, after the drying step, the dried material has moisture content inferior to 10%.

29. The operating method according to claim 26 , wherein the roasting exhaust gas is injected into an iron making process.

30. The operating method according to claim 26 , wherein the roasting exhaust gas is sent to a power plant.

31. The operating method according to claim 19 , wherein the waste material is an organic waste material.

32. The operating method according to claim 21 , wherein the organic waste material is waste wood.

Assignees

• Arcelormittal

Inventors

• Geeroms Joris
• Spelier Kurt
• Van De Casteele Stefaan

Classifications

• F26B21/40

  using gases other than air · CPC title

• F26B21/50 Primary

  Ducting arrangements from the source of air or other gases to the materials or objects being dried · CPC title

• C21B5/003 Primary

  Injection of pulverulent coal · CPC title

• C21B2100/62

  Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production · CPC title

• C10B57/10

  Drying · CPC title