Method for constructing sectional cooling system in blast furnace

Abstract

The invention discloses a method for constructing a sectional cooling system in a blast furnace. The method comprises the following steps: dividing each part of the blast furnace into a single-section or multi-section cooling wall; from the bottom to the top of the blast furnace, connecting every n sections of cooling walls in series to form a first-stage cooling system, making the cooling walls at the middle-lower part of the blast furnace body independent to obtain a new multi-stage cooling system, and constructing an independent cooling system by the cooling walls at the middle-lower part of the blast furnace body; cooling a new multi-stage cooling system by using closed circulating soft water, and cooling an independent cooling system by using industrial water in an open-circuit circulating manner; independently forming an independent cooling system for independent cooling by the cooling wall at the middle-lower part of the furnace body, so that the easily damaged part can be independently regulated and controlled, and a good condition is created for stable and smooth furnace condition of the large blast furnace. According to the scheme, a leakage detection mode is optimized, a water leakage condition of the cooling equipment can be visually detected and judged, the working environment of water conservancy project leakage detection is observed, the labor intensity is reduced, and the work efficiency and safety are improved.

Description

technical field [0001] The invention relates to the technical field of blast furnace cooling, in particular to a method for constructing a subsection cooling system in a blast furnace. Background technique [0002] After the large blast furnace in the ironworks was put into operation, under the condition that the smelting intensity of the blast furnace gradually increased, since the central area of ​​the blast furnace is the area where the air flow and temperature of the blast furnace change most violently, the cooling equipment is most likely to be damaged. It was found that the cooling equipment in the middle and lower parts of the furnace body The most vulnerable to damage, and the number of damage is increasing year by year. [0003] On the one hand, water leakage from the cooling equipment will consume the heat of the blast furnace due to the decomposition and absorption of carbon-water reaction. On the other hand, the leakage of cooling water into the furnace will also...

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Problems solved by technology

[0002] After the large blast furnace in the ironworks was put into operation, under the condition that the smelting intensity of the blast furnace gradually increased, since the central area of ​​the blast furnace is the area where the air flow and temperature of the blast furnace change most violently, the cooling equipment is most likely to be damaged. It was found that the cooling equipment in the middle and lower parts of the furnace body The most vulnerable, and the number of damages is increasing year by year

[0003] On the one hand, water leakage from the cooling equipment will consume the heat of the blast furnace due to the decomposition and absorption of carbon-water reaction. On the other hand, the leakage of cooling water into the furnace will also cause local thickening of the furnace wall, and the slag skin is unstable and prone to frequent drop. Falling into the furnace hearth will cause the temperature of the blast furnace to cool down sharply, leading to furnace cooling accidents, and frequent slag skin falling makes it difficult to maintain stable production in the blast furnace

[0004] The frequent drop of the furnace wall slag skin can be controlled by adjusting a certain drop in the cooling system in the middle of the blast furnace shaft. However, the existing cooling system is an overall closed-loop system, and the adjustment will affect the cooling of the entire system, which may cause The temperature fluctuation of the furnace wall in other normal areas affects the stability of the furnace condition; and the overall closed-loop system is not convenient for leak detection; the overall closed-loop system is inconvenient for water leakage management, and the working environment for leak detection is difficult and labor-intensive

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