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Method for determining damaged conditions of refractory lining of high-air temperature hot air furnace on line

A technology of refractory material and lining, applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve the problems of bad social impact, burning out of hot blast furnace system, and economic loss of enterprises

Inactive Publication Date: 2013-04-10
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Eventually, the hot blast stove system will burn out, or even explode and other vicious accidents
In recent years, similar accidents have been reported continuously, and blast furnaces have been shut down unplanned, causing huge economic losses and adverse social impacts on enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The temperature of the furnace shell in the 3# hot blast outlet area of ​​the 1# blast furnace rises, and four 6″ compressed air pipes are installed to cool it. About 155°C. During the 12-hour routine maintenance of the blast furnace, the technical method of the present invention is applied to gradually turn off the air source of the cooling device 30 minutes before the blast furnace shutdown, and use an infrared temperature measuring gun to monitor the temperature change of the furnace shell. After 5 minutes, the furnace shell The temperature reaches a maximum value of 392°C, and the average rate of rise is 39°C / min. It is judged that cross air pores appear in the refractory lining in the furnace shell, and the damaged lining in this area is maintained by beating with a screw pump.

[0015] Weld two grouting holes, and press in a total of 180Kg of high-alumina phosphate mud. After the blast furnace air supply is resumed, the temperature of the furnace shell ...

Embodiment 2

[0016] Example 2: The temperature of the furnace shell in the 3# hot blast outlet area of ​​the 2# blast furnace rises, and two 6″ clean ring water pipes are installed for cooling, and the flow rate is 2~3t / h. At the end of the blast furnace, the furnace shell temperature reaches about 85 °C; When the furnace is cut off, the temperature of the furnace shell is about 35°C. During the 16-hour routine maintenance of the blast furnace, the technical method of the present invention is applied, and the cooling water source is gradually turned off 45 minutes before the blast furnace is shut down, and the temperature change of the furnace shell is monitored with an infrared temperature measuring gun. After 4 minutes, the furnace shell turns dark red, the temperature reaches 850°C, and the average rate of rise is 201°C / min. It is judged that the refractory lining in the furnace shell has collapsed and the damage is serious. It should be repaired by on-site digging or hanging formwork Po...

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PUM

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Abstract

The invention discloses a method for determining damaged conditions of refractory lining of a high-air temperature hot air furnace on line, and belongs to the technical field of maintenance of hot air furnace technical system of iron making blast furnace. Tools required in the method comprises an infrared temperature measuring gun, a rubber pipe, a 6'' seamless tube, a compressed air source and a purifying cycle water source. The method comprises the following technical steps: erecting a cooling device; monitoring the temperature and controlling data; and accurately and effectively determining the damaged conditions of the refractory lining of a hot air furnace system. The method has the advantage that a reasonable construction and maintenance scheme is put forth and a sufficient technical basis is provided for planned maintenance of the blast furnace, thus ensuring safe and long-life running of the high-air temperature hot air furnace system.

Description

technical field [0001] The invention belongs to the technical field of iron-making blast furnace hot blast stove process system maintenance, and in particular relates to a method for on-line judging the damage status of the refractory inner lining of a high blast temperature hot blast stove. The online judgment of the damage status of the material lining is suitable for the maintenance of the hot blast furnace process system and the safe and long-life operation and maintenance. Background technique [0002] With the continuous advancement of blast furnace smelting technology, the long-life hot blast stove process system that can provide a blast temperature above 1200°C is an important technical means for blast furnace ironmaking to achieve large coal injection, coke ratio reduction, and cost reduction. Important technical guarantee for low consumption, longevity and environmental protection. [0003] In recent years, no matter whether the domestic ironmaking blast furnace a...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B7/06
Inventor 刘国生丁汝才温太阳李钢
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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