Method for protecting an inner wall of a shaft furnace

Patent metadata

Field	Value
Publication number	US-12235047-B2
Application number	US-201917299182-A
Country	US
Kind code	B2
Filing date	Dec 13, 2019
Priority date	Dec 13, 2018
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A method for protecting an inner wall ( 12 ) of a shaft furnace, the method comprising the steps of: providing at least one injection device ( 28 ) through the inner wall ( 12 ) of the shaft furnace, the injection device ( 28 ) being configured to inject protective material into the shaft furnace; and injecting on demand the protective material into the shaft furnace through the injection device ( 28 ), in such a manner that the protective material builds up to form a protection wall between the interior of the shaft furnace and the furnace wall ( 12 ).

First claim

The invention claimed is:

1. Method for protecting a wall of a shaft furnace, wherein the furnace wall comprises a lining of cooling staves and an innermost surface which directly interfaces with an interior of the shaft furnace, the method comprising the steps of:
providing at least one injection device through the furnace wall and through a cooling stave, the injection device comprising an injection lance having an open-end at the innermost surface of the furnace wall and being configured to inject protective material into the interior of the shaft furnace and onto the innermost surface, wherein the protective material comprises at least one of slag, coal, ore, sinter, refractory material, mills scales and mills pellet; and
injecting on demand the protective material into the shaft furnace through the at least one injection device, in such a manner that the protective material builds up to form a protection wall on the innermost surface of the furnace wall,
wherein a hot face of the cooling stave comprises a profile with ribs and grooves, wherein the step of providing the injection device through the cooling stave comprises the step of passing the injection device through a rib or a groove of the profile of the hot face of the cooling stave,
wherein the formed protection wall comes into contact with burden material during a normal furnace operation, and
wherein said injecting on demand occurs during the normal furnace operation.

2. Method according to claim 1 , wherein the cooling stave comprises at least one protection ledge, wherein the step of providing the injection device through the cooling stave comprises the step of providing the injection device above, through or below the protection ledge.

3. Method according to claim 1 , wherein the step of injecting protective material comprises the step of covering the furnace wall with protective material by gravity.

4. Method according to claim 1 , wherein the step of injecting protective material comprises the step of injecting protective material during furnace operation.

5. Method according to claim 1 , wherein the step of injecting protective material comprises the step of injecting protective material at a predetermined angle relative to the inner wall of the shaft furnace.

6. Method according to claim 1 , wherein the protective material comprises solid material, fluid material, or a combination of solid and fluid materials.

7. Method according to claim 6 , wherein the protective material comprises granular particles or stamped or particles, or particles that are larger than said granular particles and said stamped particles.

8. Method according to claim 7 , wherein the protective material comprises a round shape granular material.

9. Method according to claim 1 , wherein the protective material is mechanically injected into the shaft furnace by a mechanical injection device comprising a piston for pushing the protective material into the shaft furnace.

10. Method according to any of claim 1 , wherein the protective material is a protective powder material injected in a fluid.

11. Method according to claim 10 , wherein the protective powder comprises N 2 or blast furnace clean gas recovered from a lower level as a fluid.

Assignees

• Wurth Paul Sa

Inventors

• Maggioli Nicolas
• Mustafa Esmer

Classifications

• F27D2001/161

  Hot repair · CPC title

• F27D2001/047

  Lining of cylindrical vessels · CPC title

• F27D1/1642

  using a gunning apparatus · CPC title

• F27D1/1626

  Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall · CPC title

• F27D1/0003

  Linings or walls · CPC title