Method for rapidly lowering charge level during blowing out of blast furnace

Abstract

The invention relates to a method for rapidly lowering charge level during blowing out of a blast furnace. The method comprises the following steps: providing a blast furnace, arranging a water spraying device at the top of the blast furnace, and cooling gas at the top of the blast furnace by using the water spraying device, wherein the top of the blast furnace is provided with a gas outlet, and the gas outlet is communicated with a bag-type dust collector; pre-damping down the blast furnace, and installing a stock rod in the blast furnace; supplying air to the blast furnace, wherein the air supply volume is the air volume in the full-air state; detecting the temperature in the bag-type dust collector, and adjusting the flow of the water spraying device according to the temperature of the bag-type dust collector, so that the temperature is equal to T0; adjusting the air supply volume according to the charge level position, and setting the descending speed of the charge level to be V0; and carrying out continuous tapping by the blast furnace when the air supply volume is larger than 50% of the air volume in the full-air state, and carrying out tapping at the interval of time t1 by the blast furnace when the air supply volume is smaller than or equal to 50% of the air volume in the full-air state. The method has the characteristics of high furnace shutdown safety coefficient and high furnace 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.