A kind of method for rapidly lowering material level in blast furnace shutdown

Abstract

The invention relates to a method for rapidly reducing the material surface of a blast furnace after shutting down the blast furnace, comprising: providing a blast furnace, and installing a sprinkler on the top of the blast furnace, using the sprinkler to cool down the gas located on the top of the blast furnace, and the top of the furnace has a gas outlet , the air outlet is connected to the bag filter; the blast furnace is pre-shutdown, and a probe is installed in the blast furnace; The temperature of the dust collector adjusts the flow rate of the sprinkler so that the temperature is equal to T0; adjusts the air supply volume according to the position of the material surface, and makes the falling speed of the material surface V0; when the air supply volume is greater than 50% of the air volume in the full wind state , the blast furnace continuously taps iron, when the air volume of the air supply is less than or equal to 50% of the air volume in the full wind state, the blast furnace taps iron at an interval time t1. The method has the characteristics of high shutdown safety factor and high shutdown efficiency.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a method for quickly lowering the material level of a blast furnace when it is shut down. Background technique [0002] At present, the blast furnace is designed to last for 15 years. After a certain period of production, the blast furnace needs to be shut down for overhaul. When the furnace is shut down, it is necessary to remove the ore and coke in the furnace, so that the inner wall of the blast furnace is exposed for maintenance. In the prior art, the method of sprinkling water on the top of the blast furnace to lower the surface of the material is generally used to shut down the blast furnace. The temperature of the top of the blast furnace is controlled by sprinkling water to avoid burning the surrounding equipment when the top temperature is too high. In the current shutdown operation, in order to ensure that the temperature of the top of the furnace is wit...

AI Technical Summary

Problems solved by technology

In the current shutdown operation, in order to ensure that the temperature of the top of the furnace is within the required range, a small air volume is usually input to participate in the smelting, which leads to a long time for lowering the material surface. 3 Take the blast furnace as an example, the time to lower the material surface reaches about 15 hours, which is not conducive to improving the shutdown efficiency

At the same time, due to the long shutdown time, the probability of material collapse and knocking accidents will also increase during the process of lowering the material surface.

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