Method for judging disappearance of soft melting zone in blowing-out process

Abstract

The invention relates to the field of ferrous metallurgy. The invention discloses a method for judging disappearance of a soft melting zone in a blowing-out process. The method comprises the following steps: 1, total oxygen and total nitrogen entering a furnace are calculated according to the blast capacity BV and the humidification capacity BH of the blast furnace and the total amount of nitrogen introduced into the furnace; 2, the proportion of the total oxygen in furnace top gas and the proportion of the total nitrogen in the furnace top gas are analyzed and calculated according to the components of the furnace top gas of the blast furnace; and 3, a furnace admission oxygen-nitrogen ratio (O2/N2)furnace admission of the blast furnace to an oxygen-nitrogen ratio (O2/N2)furnace top of the blast furnace is calculated, then a ratio M of the (O2/N2)furnace admission to the (O2/N2)furnace top is calculated, and when M is greater than 0.95, the soft melting zone still exists, otherwise, the soft melting zone disappears.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy. Background technique [0002] The disappearance of the refractory zone is an important node during the shutdown process of the blast furnace. The traditional judgment method during the shutdown process is to judge according to the composition of the top gas. The disappearance is limited by the hysteresis of manual sampling, analysis and measurement of the top gas composition during the shutdown process. At the same time, it is necessary to judge whether the inflection point of CO2 appears with the data before and after the reflow zone disappears. The actual judgment will lag behind the actual disappearance. In order to ensure that during the shutdown process In order to ensure safety, measures such as reducing the wind will be taken when the CO2 drops to a certain value and the material line falls to the lower part of the furnace body, which will slow down the shutdown process. Therefore,...

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Problems solved by technology

[0002]The disappearance of the refractory zone is an important node during the shutdown process of the blast furnace. The traditional judgment method during the shutdown process is to judge according to the top gas composition. When the gas composition When the inflection point of CO2 occurs, it is used as a basis to judge whether the soft melting zone has disappeared, which is limited by the hysteresis of manual sampling analysis and measurement of the top gas composition during the shutdown process, and at the same time, it is necessary to judge whether the CO2 has an inflection point together with the data before and after the melting zone disappears. , the actual judgment will lag behind the actual disappearance. In order to ensure the safety during the shutdown process, measures such as reducing the wind will be taken when the CO2 drops to a certain value and the material line falls to the lower part of the furnace body, so that the shutdown process will be slowed down. Therefore, The traditional method cannot reflect whether the reflow zone disappears in time, and cannot provide an accurate basis for the operation of key parameters of the blast furnace shutdown operation

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