Slag door for a melting furnace

Patent metadata

Field	Value
Publication number	US-11614283-B2
Application number	US-202016833363-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 29, 2019
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A slag door for a melting furnace for the production of steel is suitable to be associated with an aperture provided in a lateral wall of the melting furnace and to cooperate with a slag channel provided inside the melting furnace itself.

First claim

The invention claimed is:

1. A slag door for a melting furnace for the production of steel, the slag door suitable to be associated with an aperture provided in a lateral wall of the melting furnace and to cooperate with a slag channel provided inside the melting furnace, the slag door comprising:
a frame on which a sliding closing panel is mounted, the frame configured to selectively assume a lowered position to close said slag channel, in which a lower part of the closing panel substantially abuts a base surface of the slag channel, and a raised position to open said slag channel in which the closing panel is partly or completely raised; and
a slag removal device, mounted on and movable relative to said frame the slag removable device comprising a cleaning arm having at its end a cleaning element configured to be moved inside the slag channel when the closing panel is in the raised position; said slag removal device having a working operating position, when the sliding closing panel is located in the raised opening position, in which the cleaning element moves until it penetrates through the aperture of the melting furnace along the slag channel and exerts a cleaning and descaling action on the slag present in said slag channel, and an inactive operating position in which the sliding closing panel is raised and outside the bulk of said aperture of the melting furnace,
wherein the slag removal device further comprises a movement arm having a first end hinged to the frame and a second end hinged to the cleaning arm, thereby defining a double articulation arm.

2. The slag door as in claim 1 , wherein said closing panel is disposed along a sliding axis inclined by an angle of inclination comprised between 45° and 85° with respect to a working axis of the slag removable device.

3. The slag door as in claim 1 , wherein said closing panel is provided with a pressure transducer configured to detect when the closing panel is substantially abutting on the base surface of the slag channel in the lowered closing position.

4. The slag door as in claim 1 , wherein said closing panel is provided with at least two metal layers in which:
a first metal layer is provided on the internal side of the closing panel facing toward the melting furnace;
a second metal layer is provided on the external side of the closing panel opposite the internal side, the second metal layer being different from the first metal layer.

5. The slag door as in claim 1 , wherein said cleaning arm has a pivoting portion hinged to the movement arm and an oblong portion angled with respect to the pivoting portion at an angle between 100° and 140° to define a shape of the cleaning arm like an L or a J.

6. The slag door as in claim 5 , wherein said movement arm and said cleaning arm, in the working operating position of the slag removal device, are suitable to assume a plurality of reciprocal rotation positions with an angle of reciprocal rotation between a longitudinal axis of the movement arm and an axis of rectilinear development of the oblong portion of the cleaning arm that varies between 50° and 120°.

7. The slag door as in claim 1 , wherein said cleaning element has an oblong shape with a size equal to or slightly less than the width of the aperture of the melting furnace.

8. The slag door as in claim 1 , wherein said cleaning element has a plurality of scraping teeth to facilitate the removal of encrustations in the slag channel.

9. The slag door as in claim 1 , wherein said cleaning element is rotatable around a longitudinal axis thereof, parallel to the base surface of the slag channel.

10. A melting furnace for the production of steel, the melting furnace comprising:
lateral walls;
an aperture in one of the lateral walls;
a slag channel associated with said aperture and extending toward the inside of said melting furnace; and
a slag door as in claim 1 , the slag door configured to cooperate with said slag channel.

11. A method to clean and remove slag from a slag channel of a melting furnace for the production of steel through a slag door as defined in claim 1 , wherein said method provides to clean and remove the slag by means of the slag removal device during a steel tapping step.

12. The slag door as in claim 1 , wherein said closing panel has a length that is greater than a height of the aperture of the lateral wall of the melting furnace.

13. The slag door as in claim 4 , wherein the first metal layer has a higher thermal conductivity than the second metal layer.

14. The slag door as in claim 4 , wherein the second metal layer has a higher mechanical strength than the first metal layer.

15. The slag door as in claim 4 , wherein the first metal layer has a higher thermal conductivity than the second metal layer, and wherein the second metal layer has a higher mechanical strength than the first metal layer.

16. The slag door as in claim 5 , wherein the oblong portion is integrally connected on one side to the pivoting portion and on the other side to the cleaning element.

17. A slag door for a melting furnace for the production of steel, the slag door suitable to be associated with an aperture provided in a lateral wall of the melting furnace and to cooperate with a slag channel provided inside the melting furnace, the slag door comprising:
a frame on which a sliding closing panel is mounted, the frame configured to selectively assume a lowered position to close said slag channel, in which a lower part of the closing panel substantially abuts a base surface of the slag channel, and a raised position to open said slag channel in which the closing panel is partly or completely raised; and
a slag removal device, mounted on and movable relative to said frame, the slag removable device comprising a cleaning arm having at its end a cleaning element configured to be moved inside the slag channel when the closing panel is in the raised position; said slag removal device having a working operating position, when the sliding closing panel is located in the raised opening position, in which the cleaning element moves until it penetrates through the aperture of the melting furnace along the slag channel and exerts a cleaning and descaling action on the slag present in said slag channel, and an inactive operating position in which the sliding closing panel is raised and outside the bulk of said aperture of the melting furnace,
wherein the slag removal device is hinged to the frame, and
wherein said closing panel is provided with a pressure transducer configured to detect when the closing panel is substantially abutting the base surface of the slag channel in the lowered closing position.

Assignees

• Danieli Off Mecc

Inventors

• Da Costa Paulo
• Scotti Franco
• Burin Paolo

Classifications

• Y02P10/20

  Recycling · CPC title

• F27D1/18

  Door frames; Doors, lids or removable covers · CPC title

• F27D3/15

  Tapping equipment; Equipment for removing {or retaining} slag · CPC title

• F27D25/001

  comprising breaking tools, e.g. hammers, drills, scrapers · CPC title

• F27M2003/13

  Smelting · CPC title