Method for treating blast furnace hearth freezing and iron notch oxygen lance for use

Abstract

The invention discloses a method for treating blast furnace hearth freezing and an oxygen lance used, comprising the following steps: (1) shutting down the blast furnace, dredging the slag and iron ditch in front of the furnace, and preparing for the discharge of slag and iron; (2) opening the iron hole Install the drill pipe on the machine, and use the drill bit to pre-drill the iron hole to the red point; (3) replace the iron hole opening machine with the oxygen lance, and push the oxygen lance into the red point in the iron hole tunnel; (4) feed the oxygen lance Oxygen and compressed air; (5) The oxygen lance is withdrawn from the iron hole regularly, and the molten slag-iron mixture is discharged; (6) When the volume of the discharged slag-iron mixture reaches 20%-40% of the hearth volume, the blast furnace is re-aired; (7) Repeat the operation of step 5, and gradually add air to fully restore the working state of the hearth. When this method is used to treat hearth freezing, the oxygen lance used can completely discharge the solidified slag-iron mixture in the hearth, quickly restore the working state of the hearth, significantly shorten the time for processing hearth freezing, and save a lot of manpower and material resources cost.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking technology, and specifically relates to a method for dealing with freezing of a blast furnace hearth and an oxygen lance for use. Background technique [0002] Hearth freezing is a major accident in blast furnace production. It is generally caused by a large amount of water leakage from the cooling equipment into the furnace, incorrect loading of materials and excessive load that cannot be detected in time, collapse of furnace tumors or serious pipeline travel due to air flow disturbance. In the blast furnace with frozen hearth, the slag iron liquid loses its fluidity and cannot be discharged normally from the iron port. The slag iron liquid level rises and damages the small tuyere sleeve greatly, the air volume shrinks greatly, and it is even difficult to receive the wind. cause more serious losses. [0003] The conventional method to deal with the freezing of the hearth is to k...

AI Technical Summary

Problems solved by technology

In the blast furnace with frozen hearth, the slag iron liquid loses its fluidity and cannot be discharged normally from the iron port. The slag iron liquid level rises and damages the small tuyere sleeve greatly, the air volume shrinks greatly, and it is even difficult to receive the wind. cause more serious damage

[0003] The conventional method to deal with the freezing of the hearth is to keep one or two tuyeres above the iron hole to supply air, and block all the remaining tuyeres. At the same time, the operator in front of the furnace holds the oxygen tube and continuously burns the iron hole below the tuyere until the gap between the iron hole and the tuyere The solidified slag iron melts and flows out, the iron hole and the tuyere are connected, and then the surrounding tuyere is gradually opened to slowly expand the result. This method requires the furnace front workers to work continuously, which consumes a lot of manpower and consumes a lot of oxygen pipes.

When the freezing is severe, it is difficult to burn through the tap hole, and the iron can only be tapped through the tuyere next to the air supply port as a temporary tap hole. However, the site environment is complex and changeable, which may cause the coke in the furnace to collapse and gushes out, or even the molten iron explodes, expanding the ACCIDENT

Conventional methods often take days or even weeks to completely deal with hearth freezing, and the cost of manpower and material resources is huge during this period

Images