Scrap dryer and/or scrap preheater

Patent metadata

Field	Value
Publication number	US-12050060-B2
Application number	US-202217814916-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Jul 30, 2021
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A device ( 1 ) for drying and/or preheating metallic and/or non-metallic materials, preferably scrap, comprises a receiving container ( 3 ) and a scrap basket ( 7 ) which is arranged in the receiving container ( 3 ) and has a gas-permeable bottom area ( 9 ). The receiving container ( 3 ) has at least one process gas inlet line ( 6 ) in its wall ( 4 ), via which a process gas with a temperature in the range from 200 to 1600° C. can be introduced into the receiving container ( 3 ), and at least an injector nozzle ( 19 ) arranged coaxially within the at least one process gas inlet line ( 6 ) via which a cooling gas can be introduced into the process gas.

First claim

What is claimed is:

1. A device ( 1 ) for drying and/or preheating scrap, comprising:
a receiving container ( 3 );
a scrap basket ( 7 ) arranged in the receiving container ( 3 ), the scrap basket ( 7 ) having a gas-permeable bottom area ( 9 ),
a process gas inlet line ( 6 ) that extends through a wall ( 4 ) of the receiving container ( 3 ) and via which a process gas can be introduced into the receiving container ( 3 );
an injector nozzle ( 19 ) arranged coaxially within the process gas inlet line ( 6 );
a cover element ( 25 ) or a hood ( 23 ) fluidically connected to a process gas outlet line ( 24 ); and
an outlet line blower ( 31 ) arranged in the process gas outlet line ( 24 ),
wherein a cooling gas can be introduced into the process gas via the injector nozzle ( 19 ), and
wherein a temperature of the process gas upstream of the injector nozzle ( 19 ) is in a range from 200 to 1600° C., and
wherein a temperature of the process gas downstream of the injector nozzle ( 19 ) is lower than 600° C., and
wherein the process gas flowing through the scrap basket ( 7 ) and ambient air are sucked off via the cover element ( 25 ) or the hood ( 23 ) through the process gas outlet line ( 24 ) by the outlet line blower ( 31 ).

2. The device ( 1 ) according to claim 1 ,
wherein the injector nozzle ( 19 ) is fluidically connected via a cooling gas line ( 20 ) to a cooling line blower ( 21 ).

3. The device ( 1 ) according to claim 1 ,
wherein the injector nozzle ( 19 ) is designed as a subsonic nozzle.

4. The device ( 1 ) according to claim 1 ,
wherein the process gas inlet line ( 6 ) has a cooling section ( 22 ) including a water-cooled cooling jacket.

5. The device ( 1 ) according to claim 1 ,
wherein the process gas inlet line ( 6 ) is arranged in a lower region of the wall ( 5 ).

6. The device ( 1 ) according to claim 1 ,
wherein the gas-permeable bottom area ( 9 ) of the scrap basket ( 7 ) is arched and comprises a plurality of circumferential slots ( 10 ) through which the process gas can be introduced into the scrap basket ( 7 ).

7. The device ( 1 ) according to claim 6 ,
wherein the slots ( 10 ) are formed by an arrangement of stacked sheets ( 11 ).

8. The device ( 1 ) according to claim 1 ,
wherein the scrap basket ( 7 ) comprises a flange ( 13 ) with a sealing collar ( 14 ) arranged at an outer lateral surface ( 12 ) of the scrap basket ( 7 ), and
wherein the sealing collar ( 14 ) corresponds to a sealing seat ( 15 ) of the receiving container ( 3 ) so that the receiving container ( 3 ) can be hermetically sealed with respect to the scrap basket ( 7 ).

9. The device ( 1 ) according to claim 8 ,
wherein the sealing seat ( 15 ) comprises a sand-filled annular channel.

10. The device ( 1 ) according to claim 1 ,
wherein the receiving container ( 3 ) has a support ( 17 ) on which the scrap basket ( 7 ) can be placed.

11. The device ( 1 ) according to claim 1 ,
wherein the receiving container ( 3 ) comprises a water pipe ( 18 ) through which condensed water that is accumulated during a drying process can be removed from the receiving container ( 3 ).

12. A method for drying and/or preheating scrap, comprising:
providing the device as in claim 1 ; and
admixing a cooling gas to the process gas via the injector nozzle ( 19 ) arranged coaxially in the process gas inlet line ( 6 ).

13. A metallurgical plant ( 2 ), comprising:
a melting furnace ( 26 );
a post-combustion chamber ( 8 ) fluidically connected to the melting furnace ( 26 ) via a process gas exhaust line ( 27 ); and
the device ( 1 ) according to claim 1 fluidically connected to the post-combustion chamber ( 8 ) via the process gas inlet line ( 6 ).

14. The metallurgical plant ( 2 ) as in claim 13 , further comprising
a treatment plant ( 29 ), the treatment plant ( 29 ) being fluidically connected to the post-combustion chamber ( 8 ) by
a process gas main line ( 28 ).

15. The metallurgical plant ( 2 ) as in claim 14 , further comprising
a valve ( 30 ) arranged in the process gas inlet line ( 6 ) for selectively feeding a partial volume flow of the process gas from the post-combustion chamber ( 8 ) to the device ( 1 ) while feeding a major part of the process gas to the treatment plant ( 29 ).

16. The metallurgical plant ( 2 ) as in claim 14 , wherein the melting furnace ( 26 ) is
an electric arc furnace (EAF).

17. The device ( 1 ) according to claim 1 ,
wherein the process gas inlet line ( 6 ) comprises a horizontal ring line with a plurality of connections via which the process gas is fed to the receiving container ( 3 ).

Assignees

• Sms Group Gmbh

Inventors

• Krausa Steffen
• Zeisler William Todd
• Debski Paul
• Odenthal Hans-Jürgen
• Starke Peter
• Cook Richard
• Kaltenbach Michael J

Classifications

• F27D2009/0075

  in direct contact with the charge · CPC title

• F27D99/0073

  Seals · CPC title

• Y02P10/20

  Recycling · CPC title

• C21C5/565

  Preheating of scrap · CPC title

• F27D13/002 Primary

  Preheating scrap · CPC title