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Quantitative recovery method for long-term blowing-down of blast furnace

A recovery method and blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of large changes in furnace conditions recovery parameters and different recovery times.

Inactive Publication Date: 2013-03-27
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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Problems solved by technology

[0002] The long-term wind break (8-16 hours) and furnace condition recovery of Shougang BF's previous planned maintenance still generally have the characteristics of strong randomness and artificiality, which lead to large changes in the parameters of each furnace condition recovery, and the length of recovery time varies. question

Method used

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Examples

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Embodiment Construction

[0066] A blast furnace in Shougang was scheduled to be overhauled within 12 hours. Before the wind shutdown, the batch of blast furnace ore was 60t, and the load was 5.20. The furnace condition was smooth and stable, and the air volume and furnace temperature were within the specified range. At 3:00, the furnace began to add the shutdown material, the first stage of light load material was 10 batches, the load was 3.6, and then the second stage of light load material was added until the shutdown, the load was 4.70, and at 8:00, the blast furnace slag and iron were discharged and then closed At 21:30, the blast furnace blocked 6 tuyeres to supply air to restore the furnace condition. The batch of air supply was 56 tons, and the load was 4.95. Coal injection began at 9:30, and the first iron and molten iron [Si] were discharged at 10:10. %=1.2%, the physical heat is 1485°C, after the first iron slag is seen, the tuyere is started to add air, the next day at 4:30 the furnace is fu...

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Abstract

The invention discloses a quantitative recovery method for the long-term blowing-down of a blast furnace, belonging to the technical field of blast furnace iron-making. A long-term blowing-down and furnace condition recovery process is divided into four phases, namely, a blowing-down operation phase, a blowing-down phase, a blowing-in operation phase and a furnace condition recovery phase by taking air quantity control as a core, according to the focused work in each phase of the long-term blowing-down and furnace condition recovery process of the blast furnace. The quantitative recovery method has the advantages of standardizing the long-term blowing-down recovery phase of the blast furnace and the control standards of various parameters, and providing a guarantee on the safety and the high efficiency of the recovery process.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a quantitative recovery method for a long-term blast furnace shutdown. Background technique [0002] The long-term wind break (8-16 hours) and furnace condition recovery of Shougang BF's previous planned maintenance still generally have the characteristics of strong randomness and artificiality, which lead to large changes in the parameters of each furnace condition recovery, and the length of recovery time varies. question. The present invention quantifies the stages of the long-term wind shutdown and furnace condition recovery process, defines the key tasks, quantification principles and parameter control standards of each stage, and makes the long-term wind shutdown and furnace condition recovery work of the blast furnace safe and efficient, which is an important economic and technical indicator of the blast furnace. Progress lays the groundwork. ...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 马洪斌丁汝才刘国友周希楠
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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