A Method for Adjusting Furnace Charge Structure Before Ironmaking Blast Furnace Shutdown

Abstract

The invention belongs to the technical field of iron ore blast furnace smelting and relates to a method for adjusting the structure of furnace burden before the blowing-down of an iron smelting blast furnace. The specific technical scheme of the method is as follows: pure coke expected layers are arranged in a smelting cycle before the blowing-down of the blast furnace; and the positions of the pure coke expected layers in the blowing-down period of the blast furnace are: the first pure coke expected layer is positioned in a hearth of the blast furnace, the second pure coke expected layer is positioned in the upper part of the bosh of the blast furnace, the third pure coke expected layer is positioned in the lower part of the furnace body of the blast furnace, and normal burdens are arranged between the adjacent expected layers. The method is favorable to the improvement of the heat exchange rate of the upper part of the blast furnace and the rapid recovery of the physical heat of slags and iron at the lower part of the blast furnace, thereby improving slags and iron flowability and shortening furnace condition recovery time. At the same time, the method can ensure that solidified slags and iron are molten in short time in the blowing-down period of the blast furnace, avoid the freezing risk of the hearth which reblows after long-term blowing-down, ensure that slags and iron can be timely discharged before blowing-down and after reblowing, greatly reduce stokehole tapping difficulty after reblowing and reduce labor intensity.

Description

technical field [0001] The invention belongs to the technical field of iron ore blast furnace smelting, and relates to a method for adjusting the furnace material structure before the iron-making blast furnace shuts down. Background technique [0002] Blast furnace ironmaking is a continuous production process. In order to restore the function of the deteriorated equipment, the blast furnace needs to be shut down regularly; due to the long shut down time, the slag iron and hearth coke accumulated in the furnace will solidify together with the temperature drop. It is difficult to heat and melt the taphole area in a short period of time after re-airing, resulting in the physical thermal difference of slag and iron after re-airing of the blast furnace, poor fluidity, increase of iron-bonded matter in front of the furnace, and slow recovery of hearth temperature, directly resulting in increased fuel consumption , so how to restore the hearth work as soon as possible after the bl...

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Problems solved by technology

[0002] Blast furnace ironmaking is a continuous production process. In order to restore the function of the deteriorated equipment, the blast furnace needs to be shut down regularly; due to the long shut down time, the slag iron and hearth coke accumulated in the furnace will solidify together with the temperature drop. It is difficult to heat and melt the taphole area in a short period of time after re-airing, resulting in the physical thermal difference of slag and iron after re-airing of the blast furnace, poor fluidity, increase of iron-bonded matter in front of the furnace, and slow recovery of hearth temperature, directly resulting in increased fuel consumption , so how to restore the hearth work as soon as possible after the blast furnace is re-aired will directly affect the recovery process and index optimization of the furnace condition

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