Replaceable cooled nose with flow path for ceramic blower

Abstract

The present invention relates to a gas injection system for a blast furnace, shaft furnace, or metallurgical furnace having a furnace wall (12) and a cooling plate (18), the gas injection system comprising a gas distribution pipe (14) and one or more injectors (16) having a nozzle, the nozzle having a ceramic insert (52), a cooling element (18) having a hot side facing away from the furnace wall (12), a protrusion (54) attached to the hot side of the cooling plate, the ceramic insert (52) traversing the furnace wall and the cooling plate and the protrusion on the cooling plate, the ceramic insert (52) having an adaptable length so that the ceramic insert (52) protrudes into the furnace, is flush with the hot surface of the cooling plate (18), or is slightly recessed from the hot surface of the cooling plate (18).

Claims

1. A gas injection system for a furnace equipped with a furnace wall (12) and a cooling plate (18), Gas distribution pipe (14) and, It comprises one or more injectors (16), each having a nozzle, Each injector (16) is fluidly connected to the gas distribution pipe (14) and is integrated with the gas distribution pipe (14). The nozzle is characterized by having a ceramic insertion portion (52), The cooling plate (18) has a high-temperature side that does not face the furnace wall (12), The protruding portion (54) is attached to the high-temperature side of the cooling plate (18) and extends from the high-temperature side of the cooling plate (18), The ceramic insertion portion (52) crosses the furnace wall (12), the cooling plate (18), and the protruding portion (54), The ceramic insertion portion (52) has a length such that it protrudes into the furnace. A furnace gas injection system in which the ceramic insertion portion (52) forms a tubular flow path for guiding high-temperature gas from the outside of the furnace wall (12) to the high-temperature side of the cooling plate (18).

2. The furnace gas injection system according to claim 1, wherein the protruding portion (54) is actively cooled by its own cooling system or via a cooling system used to cool the cooling plate.

3. The furnace gas injection system according to claim 1, wherein the protrusion (54) is passively cooled by conduction from the cooling plate (18) to which the protrusion (54) is attached.

4. The gas injection system for a furnace according to any one of claims 1 to 3, wherein the gas injection system comprises a number of injectors (16), and the ceramic insertion section (52) has different diameters and / or different ceramic compositions.

5. A furnace gas injection system according to any one of claims 1 to 4, wherein each ceramic insertion portion (52) is accessible via a connection port (58) on the furnace wall (12).

6. The furnace gas injection system according to any one of claims 1 to 5, wherein the injector (16) is oriented perpendicular or tangential to the furnace wall and has ends at different positions along the height of the protrusion (54).

7. The furnace gas injection system according to any one of claims 1 to 6, wherein the gas distribution pipe is equipped with 20 to 100 injectors.

8. The furnace gas injection system according to any one of claims 1 to 7, wherein the gas distribution pipe (14) is divided into several parts arranged around the furnace, and each part is supplied by an individual high-temperature reducing gas supply line.

9. A furnace gas injection system according to any one of claims 1 to 8, wherein a protruding cover (100) is positioned above the injector and is configured to protect the portion of the ceramic insertion part (52) that protrudes into the furnace from the descending charging material.

10. A metallurgical plant for producing iron products, comprising a furnace and at least one gas injection system according to any one of claims 1 to 9.

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