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Method capable of rapidly reaching yield after small and medium maintenance of blast furnace

A blast furnace and high-capacity technology, applied in blast furnaces, blast furnace details, blast furnace parts and other directions, can solve problems such as frequent pipes, slippery materials, and frequent suspensions, affecting the stability of blast furnaces, and irregular operating furnace shapes, and achieve good results. and economic benefits, good mobility, and manpower saving

Inactive Publication Date: 2011-05-04
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the operating furnace type is irregular, the gas flow distribution in the furnace is disordered, and the pipelines, sliding materials, and hanging materials are frequent, which seriously affects the stability and smooth operation of the blast furnace, and brings great difficulties to the operation of the blast furnace, so maintenance is required
Usually, according to the scale and workload of maintenance and the degree of impact on production, blast furnace maintenance is mainly divided into minor repairs and major repairs. Both of them need to stop the wind and stop production, so they will inevitably have a greater impact on production.

Method used

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  • Method capable of rapidly reaching yield after small and medium maintenance of blast furnace
  • Method capable of rapidly reaching yield after small and medium maintenance of blast furnace
  • Method capable of rapidly reaching yield after small and medium maintenance of blast furnace

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Embodiment Construction

[0014] The method for rapidly reaching production capacity of the blast furnace after minor and medium repairs in the present invention needs to go through three stages: shutdown, minor and medium repairs and start-up. Among them: before the shutdown, the furnace conditions were adjusted as follows: Four days before the shutdown, fluorite (mainly composed of calcium fluoride CaF 2 ) 0.09-0.15 tons / batch, manganese ore 0.8-0.9 tons / batch, maintain the [Mn]% at 0.9-1.05%, and control the [Si]% at 0.50%-0.65% during the furnace washing period; the coke ratio increased one day before the shutdown To 625±20kg / t, the ore batch is 25.6±2 tons / batch; add 25±1 tons of cover coke on the material surface before the pre-shutdown, and the 10 batches of coke before the pre-shutdown are covered. The ratio is 900±20kg / t; the [Si]% of the day before the shutdown of the furnace is 0.85%-1.00%, and the binary alkalinity of the slag is controlled by 1.05-1.10.

[0015] At the same time, the oper...

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Abstract

The invention relates to a method capable of rapidly reaching a yield after the small and medium maintenance of a blast furnace, mainly comprising the steps of adjusting a furnace condition before stopping the furnace, selecting relevant technological parameters in the process of running the furnace, and the like. The invention discharges iron slag in time and realizes the purpose of smooth furnace running and rapid yield reaching of the blast furnace through establishing a scientific furnace running scheme and sufficient preparation and adopting a reasonable air supply and loading system, and the yield reaching schedule achieves a satisfactory purpose. The whole production process of the invention is safe, sequential, scientific and high-efficient, the utilization factor of the blast furnace can achieve 2.253t / m3.d within 5 days, and in the whole process of furnace-running yield reaching, the blast furnace has the advantages of favorable iron slag fluidity, satisfactory quality of molten iron and less unplanned blast stoppage, greatly saves manpower and physical resources and obtains favorable effects and economic benefits.

Description

technical field [0001] The invention relates to a method for rapidly reaching production capacity of a blast furnace after minor and medium maintenance, and belongs to the technical field of blast furnace smelting. Background technique [0002] After a certain period of time has passed since the blast furnace was ignited and put into operation, due to its own harsh production and working environment, the blast furnace will be damaged to varying degrees, such as the steel bricks in the furnace throat are seriously upturned, the brick lining in the upper furnace body is collapsed, and the erosion is serious. As a result, the operating furnace type is irregular, the gas flow distribution in the furnace is disordered, and the pipelines, sliding materials, and hanging materials are frequent, which seriously affects the stability of the blast furnace and brings great difficulties to the operation of the blast furnace, so maintenance is required. Usually, according to the scale and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00
Inventor 雷有高魏功亮尹卫国王永贵赵仕清
Owner CHONGQING IRON & STEEL CO LTD
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