Air supply recovery method

Abstract

The invention discloses an air supply recovery method, and mainly aims to rapidly recover the working of an ultra-large blast furnace after wind is stopped under a smelting condition with a heavy loadand a large coal ratio, wherein coke load is equal to or greater than 5.50, and the coal ratio is equal to or higher than 195 kg / t. By means of controlling and dredging margin gas of the ultra-largeblast furnace, enhancing the opening degree of center gas of the ultra-large blast furnace in the meantime, optimizing air supply parameters in the air supply recovery process, controlling material disorder caused by air stopping, and controlling pressure stop of the ultra-large blast furnace during air stop and air supply, the recovery time is shortened, the yield loss caused by furnace conditionfluctuation is avoided, and rapid full-wind design capacity is reached. According to the method, the air supply recovery time of the ultra-large blast furnace can be effectively reduced, the production efficiency of the blast furnace is improved, and the smelting cost is reduced. The method is suitable for being used for the ultra-large blast furnace for heavy load smelting.

Description

technical field

[0001] The present application relates to the technical field of blast furnace smelting, in particular to a method for recovering air supply. Background technique

[0002] The blast furnace needs to be shut down regularly for necessary equipment maintenance. After the maintenance is completed, it needs to return to the normal smelting state. If the furnace condition recovers smoothly, it can shorten the recovery time and reduce the loss of production, thereby reducing the cost of pig iron, protecting the top equipment and prolonging the life of the blast furnace.

[0003] At present, a lot of experience has been accumulated in the restoration of super-large blast furnace air supply, but for the restoration of super-large blast furnace air supply under the smelting conditions of heavy load and large coal ratio, the smelting parameters change greatly, and it still has its particularity, and the restoration process has its own advantages. unique place. [0004...

Examples

Embodiment Construction

[0040] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0041] The invention discloses a method for recovering air supply, which is mainly aimed at ultra-large blast furnaces (with an effective volume of 4000m 3 ) under heavy load (coke load greater than 5.50) and large coal ratio (coal ratio higher than 195kg / t) smelting conditions, the key and difficult problems in the process of air supply recovery are comprehensively analyzed during air stop and air supply. Applying blast furnace adjustment and operation methods can make the blast furnace reach full capacity as soon as possible, avoid fluctuations in furnace conditions, effectively shorten recovery time, improve blast furnace production efficiency, and reduce smelting components.

[0042]...

technical field

[0001] The present application relates to the technical field of blast furnace smelting, in particular to a method for recovering air supply. Background technique

[0002] The blast furnace needs to be shut down regularly for necessary equipment maintenance. After the maintenance is completed, it needs to return to the normal smelting state. If the furnace condition recovers smoothly, it can shorten the recovery time and reduce the loss of production, thereby reducing the cost of pig iron, protecting the top equipment and prolonging the life of the blast furnace.

[0003] At present, a lot of experience has been accumulated in the restoration of super-large blast furnace air supply, but for the restoration of super-large blast furnace air supply under the smelting conditions of heavy load and large coal ratio, the smelting parameters change greatly, and it still has its particularity, and the restoration process has its own advantages. unique place. [0004...

Examples

Embodiment Construction

[0040] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0041] The invention discloses a method for recovering air supply, which is mainly aimed at ultra-large blast furnaces (with an effective volume of 4000m 3 ) under heavy load (coke load greater than 5.50) and large coal ratio (coal ratio higher than 195kg / t) smelting conditions, the key and difficult problems in the process of air supply recovery are comprehensively analyzed during air stop and air supply. Applying blast furnace adjustment and operation methods can make the blast furnace reach full capacity as soon as possible, avoid fluctuations in furnace conditions, effectively shorten recovery time, improve blast furnace production efficiency, and reduce smelting components.

[0042]...

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