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Method for prolonging service life of cooling wall of schreyerite smelting blast furnace

A technology of cooling stave and vanadium titanite, applied in the direction of cooling device, etc., can solve problems such as endangering blast furnace production, and achieve the effect of reducing thermal stress changes

Active Publication Date: 2020-04-17
攀钢集团西昌钢钒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the cooling equipment is damaged, it will seriously endanger the blast furnace production

Method used

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  • Method for prolonging service life of cooling wall of schreyerite smelting blast furnace
  • Method for prolonging service life of cooling wall of schreyerite smelting blast furnace
  • Method for prolonging service life of cooling wall of schreyerite smelting blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] During the production process of the blast furnace, the material structure of the furnace is controlled according to 63wt% sinter + 31wt% pellet + 3wt% acidic oxidation pellet + 3wt% natural lump ore, and the overall water volume of medium pressure water is 6200m 3 / h, the overall water volume of high pressure water is 1030m 3 / h cooling parameters, the resulting product, the pig iron contains 0.27wt% Ti, the temperature of the molten iron is 1465°C, the binary alkalinity of the slag is 1.00, and the ratio of slag to iron is 585kg / t. The distribution matrix used is as follows:

[0056] cloth angle 37.5° 36.5° 34.5° 32.5° 30.5° 28.5° 23.5° Number of ore circles 0 2 3 3 2 0 0 Coke circle number 3 2 1 1 1 2 3

[0057] During the blast furnace production process, the water temperature difference of the stave is monitored. Once the temperature difference of the stave fluctuates abnormally (the fluctuation of the water temperature d...

Embodiment 2

[0059] During the blast furnace production process, the material structure of the furnace is controlled according to 63wt% sinter + 31wt% pellets + 3wt% acidic oxidation pellets + 3wt% natural lump ore, the overall water of medium pressure water: 6500m 3 / h, the overall water volume of high pressure water is 1020m 3 Cooling parameters per hour, the resulting product, the pig iron contains 0.20wt% Ti, the temperature of the molten iron is 1448°C, the binary basicity of the slag is 1.01, and the slag-iron ratio is 577kg / t. The distribution matrix used is as follows:

[0060] cloth angle 37.5° 36.5° 34.5° 32.5° 30.5° 28.5° 23.5° Number of ore circles 0 2 3 3 2 0 0 Coke circle number 3 2 1 1 1 2 3

[0061] According to the detection method in Example 1, the service life of the blast furnace stave in the blast furnace smelting method provided in Example 2 of the present invention can reach 8 years.

Embodiment 3

[0063] During the production process of the blast furnace, the material structure of the furnace is controlled according to 63wt% sinter + 31wt% pellet + 3wt% acidic oxidation pellet + 3wt% natural lump ore, and the overall water volume of medium pressure water is 6260m 3 / h, the overall water volume of high pressure water is 1050m 3 / h cooling parameters, the resulting product, the pig iron contains 0.23wt% Ti, the temperature of the molten iron is 1458°C, the binary alkalinity of the slag is 1.02, and the slag-iron ratio is 569kg / t. The distribution matrix used is as follows:

[0064] cloth angle 37.5° 36.5° 34.5° 32.5° 30.5° 28.5° 23.5° Number of ore circles 0 2 3 3 2 0 0 Coke circle number 3 2 1 1 1 2 3

[0065] According to the detection method in Example 1, the service life of the blast furnace stave in the blast furnace smelting method provided in Example 3 of the present invention can reach 8 years.

[0066] As can be seen f...

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Abstract

The invention provides a method for prolonging the service life of a cooling wall of a schreyerite smelting blast furnace. The method comprises the following steps that in the blast furnace smelting process, the mass content of Ti in pig iron is controlled to be 0.18%-0.28% and the temperature of molten iron to be 1430-1480 DEG C; in the blast furnace smelting process, the Ti content in pig iron is obtained by reducing raw materials and is basically in direct proportion to the physical heat of molten iron, the Ti content in the molten iron can be increased along with the increase of the physical heat of the molten iron, and therefore the thermal system of a hearth can be controlled by controlling the Ti content. By controlling the relative stability of the hearth thermal system, the thermal stress change of the hearth cooling wall is reduced, and the long service life of the blast furnace body cooling wall is ensured.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a method for improving the service life of a vanadium-titanium smelting blast furnace stave. Background technique [0002] The blast furnace cooling system is one of the key operating systems of the blast furnace. A reasonable blast furnace cooling system is conducive to stabilizing the slag skin, maintaining a reasonable operating furnace type, and promoting the long-term stable operation of the blast furnace and achieving the purpose of longevity. [0003] There are many factors that are harmful to the stave of the blast furnace body. Zinc is an element that coexists with iron-containing raw materials. The content of zinc in natural ore is trace, but due to the low temperature of zinc reduction and the low boiling point of liquid zinc, it can hardly be used Iron slag absorbs and is easy to enrich in the furnace. Therefore, the corrosion of zinc to the hearth cann...

Claims

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Application Information

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IPC IPC(8): C21B7/10
CPCC21B7/10
Inventor 贾晓亮马福建李清明
Owner 攀钢集团西昌钢钒有限公司
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