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Method for quick repair of blast furnace hearth local damage

A technology for blast furnace damage, which is applied in the field of metallurgy, can solve the problems of long furnace protection period and high cost, and achieve the effects of reducing furnace protection cost, high utilization rate, and improving efficiency and effect

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is just to solve the deficiencies of the furnace protection method mentioned in the background technology, comprehensively consider the characteristics of blast furnace furnace protection raw materials and the actual situation of blast furnace operation, design a method for quickly repairing the partial damage of the blast furnace hearth, and solve the previous furnace protection period Long, high cost disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Judgment of abnormal parts of blast furnace hearth temperature. When it is found that the temperature of the hearth lining detection galvanic couple rises too fast or the temperature difference of the cooling water is too large, the furnace protection raw materials can be used to protect the furnace. The basis for deciding whether to carry out furnace protection is:

[0022] A certain 3200m 3 12 thermocouples are arranged on the circumference of the blast furnace hearth, and their temperatures at the current moment are T i (k), where i=1,2,3...12; then the detection temperature of the 12 thermocouples in the furnace hearth at the previous moment is T i (k-1), where i=1,2,3...12. Let the temperature difference between the front and rear of the fifth thermocouple in the hearth be △T 5 : △T 5 =T 5 (k)-T 5 (k-1), u is the upper limit of temperature difference, in this example, u=80°C.

[0023] When satisfying △T 5 >80°C, protect the abnormal temperature immediate...

Embodiment 2

[0029] 1. Judgment of abnormal parts of blast furnace hearth temperature. When it is found that the temperature of the hearth lining detection galvanic couple rises too fast or the temperature difference of the cooling water is too large, the furnace protection raw materials can be used to protect the furnace. The basis for deciding whether to carry out furnace protection is:

[0030] In this example, the 3200m 3 E 6 , the upper limit e of cooling water temperature difference is taken as 0.8℃, satisfying E 6 >0.8°C, protect the furnace for the abnormal temperature immediately.

[0031] 2. Implement furnace protection operation. Choose to inject the furnace protection raw material from the tuyere near the abnormal part of the blast furnace hearth temperature, and increase the flow of cooling water at the abnormal part of the blast furnace hearth temperature at the same time, where the raw water volume of the cooling wall is 100m 3 / h, it is now increased to 140% of the origin...

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Abstract

The invention discloses a method for quick repair of blast furnace hearth local damage, and the method is used for quick repair of hearth local damage. The method includes: judging a blast furnace hearth temperature anomaly part and hearth damage, then blowing a furnace protection raw material from an air port near the blast furnace hearth temperature anomaly part, at the same time increasing the flow rate of cooling water at the blast furnace hearth temperature anomaly part and enhancing the blast furnace oxygen enrichment rate, using TiO2 containing mineral powder or its mixture as the furnace protection raw material, when slag tapping starts in the tapping process, starting blowing the furnace protection raw material from the air port near the blast furnace hearth temperature anomaly part, and stopping the process when iron slag is discharged completely. Compared with the prior art, the furnace protection raw material is conveyed from the blast furnace air port so as to be quickly sent into the blast furnace hearth, thus enhancing the blast furnace protection efficiency and effect, at the same time reducing the influence of increase of titanium content in iron slag to iron slag fluidity. Moreover, the method provided by the invention can reasonably control the dosage and timing of the furnace protection raw material used by the blast furnace, thus greatly reducing the blast furnace protection cost.

Description

technical field [0001] The invention relates to blast furnace longevity technology, in particular to a method for quickly repairing partial damage of a blast furnace hearth, which belongs to the field of metallurgy. Background technique [0002] Modern large-scale blast furnaces require that the first-generation furnace has not undergone intermediate repairs for more than 15 years. Although blast furnace refractory materials, cooling equipment, and cooling media have made great progress, the blast furnace hearth and local lining of the furnace bottom often erode in the actual production process. Or damaged, seriously affecting the life of the blast furnace generation, only a few blast furnaces have reached the design target. The longevity of the blast furnace is not only determined by the design and construction quality of the blast furnace hearth, but also closely related to the daily operation of the blast furnace, especially the maintenance of the hearth. [0003] The pa...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 孙鹏车玉满李连成郭天永姜喆姚硕
Owner ANGANG STEEL CO LTD
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