Method and device for introducing fine particle-shaped material into the fluidised bed of a fluidised bed reduction unit

Patent metadata

Field	Value
Publication number	US-9512496-B2
Application number	US-201314401461-A
Country	US
Kind code	B2
Filing date	Apr 4, 2013
Priority date	May 16, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A method for introducing fine particulate material ( 4 ) of ferruginous particles into a fluidized bed reduction unit ( 1 ) having a fluidized bed ( 24 ), wherein the temperature in the fluidized bed ( 24 ) is more than 300° C., and wherein the fine particulate material ( 4 ) is introduced directly into the fluidized bed ( 24 ) and/or into a free space ( 25 ) above the fluidized bed ( 24 ) by means of a burner ( 2 ). The method may be used for producing liquid pig iron ( 17 ) or liquid steel precursor products ( 18 ) by a smelting reduction process in a smelting reduction unit ( 22 ).

First claim

The invention claimed is:

1. A method for introducing a fine particulate material comprising iron-oxide-containing particles into a reduction unit for reducing the iron-oxide-containing particles by an externally supplied reduction gas wherein the reduction unit is a fluidized bed reduction unit having a fluidized bed;
the method comprising:
providing a temperature in the fluidized bed below a melting temperature of the fine particulate material, wherein the temperature is more than 300° C. and less than 900° C.;
melting exterior surfaces of particles of the fine particulate material by using flame issuing from a burner to form the fine particulate material into agglomerates while introducing the fine particulate material directly into the fluidized bed and/or into a free space above the fluidized bed by use of a burner;
holding the agglomerates in suspension by causing the reduction gas to flow upward through the fluidized bed reduction unit for reducing the iron-oxide-containing particles contained in the agglomerates by means of the reduction gas, and removing the agglomerates from the fluidized bed reduction unit after the reduction of the iron-oxide-containing particles contained in the agglomerates.

2. The method as claimed in claim 1 , further comprising obtaining at least a partial quantity of the fine particulate material from a dedusting device, a dry dedusting device, a smelting reduction unit and/or a direct reduction plant.

3. The method as claimed in claim 1 , wherein at least a partial quantity of the fine particulate material comprises the iron-oxide-containing particles;
the method further comprising increasing porosity of the iron-oxide-containing particles during introduction of the particles and/or the particulate material by means of the burner.

4. The method as claimed in claim 1 , further comprising pneumatically transporting the fine particulate material to the burner by means of a conveying gas.

5. The method as claimed in claim 1 , wherein the iron-oxide-containing particles comprise fine iron ores.

6. The method as claimed in claim 1 , wherein the fine particulate material comprises carbonaceous substances and/or is transported to the burner at a temperature of more than 150° C.

7. The method as claimed in claim 1 , further comprising operating the burner using at least one of a gaseous fuel, a liquid fuel, a solid fuel, and an oxygen-containing gas.

8. The method as claimed in claim 7 , further comprising during operation of the burner solely using the oxygen-containing gas, by reacting the oxygen-containing gas with a gas atmosphere comprising at least one of hydrogen, carbon monoxide, methane, and hydrocarbons in the reduction unit.

9. The method as claimed in claim 7 , wherein for operating the burner with the fuel, the gaseous fuel comprises at least one process gas associated with a pig iron production process.

10. The method as claimed in claim 9 , further comprising after exiting the burner, at least partially oxidizing the gaseous fuel and/or the solid fuel with an oxygen-containing gas.

11. The method as claimed in claim 10 , further comprising using at least a partial quantity of the gaseous fuel and/or at least a partial quantity of the oxygen-containing gas as conveying gas for pneumatically transporting the fine particulate material into the burner.

12. The method as claimed in claim 9 , further comprising transporting the solid fuel into the burner by a conveying gas, wherein the conveying gas comprises at least one process gas associated with a pig iron production process.

13. The method as claimed in claim 1 , further comprising feeding at least one solid material of carbon and/or a hydrocarbon carrier to the burner, and introducing the solid material by means of the burner into the reduction unit, in addition to the fine particulate material comprising the iron-oxide-containing particles.

14. The method as claimed in claim 13 , wherein the hydrocarbon carrier comprises fine coke and/or fine coal.

15. The method as claimed in claim 1 , further comprising before the introducing into the fluidized bed and/or into the free space above the fluidized bed, collecting the fine particulate material in a storage device.

16. The method as claimed in claim 15 , further comprising, after the collecting in the storage device, subsequently feeding the fine particulate material to a pressure adjusting device assigned to the storage device.

17. The method as claimed in claim 1 , for producing liquid pig iron or liquid steel intermediate products comprising:
performing a smelting reduction process in a smelting reduction unit, wherein the process comprises introducing fine particulate material into the reduction unit, and the unit is implemented as a fluidized bed reduction unit having a fluidized bed;
at least partially reducing the fine particulate material in the fluidized bed reduction unit by means of a reducing gas to produce iron intermediate products; and
smelting the iron intermediate products in a smelting reduction unit while adding an oxygen-containing gas and carbonaceous energy carriers to produce liquid pig iron or liquid steel intermediate products along with formation of the reducing gas.

18. The method as claimed in claim 17 , further comprising the at least partial reduction of the fine particulate material is performed with the addition of additives and fine particulate iron-oxide-containing feedstocks.

19. The method as claimed in claim 1 , wherein at least a partial quantity of fine particulate material comprises the iron-oxide-containing particles;
the method further comprising drying the fine particulate material during introduction of the particles and/or the particulate material by means of the burner.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Hauzenberger Franz
• Millner Robert
• Plaul Jan-Friedemann
• Rein Norbert

Classifications

• F27B15/18

  Arrangements of controlling devices · CPC title

• C21B13/143

  Injection of partially reduced ore into a molten bath · CPC title

• C21B13/14

  Multi-stage processes {processes carried out in different vessels or furnaces} · CPC title

• C21B7/22

  Dust arresters · CPC title

• C21B7/002

  Evacuating and treating of exhaust gases · CPC title