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A method for comprehensive maintenance of blast furnace hearth and furnace bottom

A comprehensive maintenance and blast furnace technology, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve economic uneconomical, discounts, although to a certain extent maintenance, lack of practical value and other problems, to prolong the life of blast furnaces, reduce The effect of smelting strength

Active Publication Date: 2020-07-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned schemes are all at the expense of blast furnace output or combustion consumption, which greatly reduces the economics of blast furnace smelting. Although the blast furnace production is maintained to a certain extent, it lacks practical value and is not economically cost-effective.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The titanium load control range is 5kg / t, and the titanium content in molten iron is controlled at 0.100% to establish a furnace hearth protection environment, increase the operating furnace temperature to 0.5%, and reduce the final slag slag alkalinity to 0.15 to ensure smooth flow.

[0049] .A tuyere is blocked at the position where the ring carbon temperature is high to control the distribution of airflow in the area and reduce the temperature point. Evenly expand the air outlet area in other areas, reducing the total area by 3%. Moderately reduce the production capacity by 8%, and increase the number of taps by one time. It is necessary to fully blow the cold air flow, hot air pressure, and reduce the oxygen-enriched amount. Wind full pressure" operation. The results of blast furnace application are shown in Table 1.

[0050] Table 1 Blast furnace application achieved results

[0051] project Fuel ratio, kg / t Pig iron output, t / d Blast furnace serv...

Embodiment 2

[0054] The titanium load control range is 10kg / t, and the titanium content in molten iron is controlled at 0.200% to establish a hearth protection furnace environment, increase the operating furnace temperature to 0.6%, and reduce the final slag slag alkalinity to 0.15 to ensure smooth flow.

[0055] .Two air outlets are blocked at the position where the ring carbon temperature is high to control the distribution of airflow in the area and reduce the temperature point. Evenly expand the air outlet area in other areas, reducing the total area by 4%. Moderately reduce production capacity by 9%, and increase the number of tapping times by 2 times. It is necessary to blow enough cold air flow, hot air pressure, and reduce oxygen enrichment. The air supply system is determined according to the symmetrical relationship between air volume and air pressure at normal strength, that is, "full Wind full pressure" operation. See Table 2 for details of the blast furnace application result...

Embodiment 3

[0060] The titanium load control range is 20kg / t, and the titanium content in molten iron is controlled at 0.300% to establish a hearth protection furnace environment, increase the operating furnace temperature to 0.7%, and reduce the final slag slag alkalinity to 0.15 to ensure smooth flow.

[0061] .Two air outlets are blocked at the position where the ring carbon temperature is high to control the distribution of airflow in the area and reduce the temperature point. Evenly expand the tuyere area in other areas to reduce the total area by 5%. Moderately reduce production capacity by 10%, increase the number of tapping times by 2 times, must fully blow the cold air flow, hot air pressure, reduce the amount of oxygen enrichment, and determine the air supply system according to the symmetrical relationship between air volume and air pressure at normal strength, that is, "full Wind full pressure" operation. See Table 3 for details of the blast furnace application results.

[0...

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Abstract

The invention relates to the technical field of iron making and in particular relates to a comprehensive blast-furnace crucible and hearth maintenance method which comprises the following specific steps: putting a titanium-containing furnace material into a blast-furnace, and controlling the titanium amount in molten iron within 0.100-0.300%, wherein the addition amount of titanium dioxide in thetitanium-containing furnace material less than or equal to 5kg is less than or equal to 20kg by a yield of one ton of iron; increasing the content of Si in the molten iron in the blast-furnace in normal operation to 0.5-0.7% from 0.3-0.5%; reducing the final slat alkalinity by 0.15-0.25; plugging 1-2 air holes above an area at a furnace cylinder circular carbon temperature greater than 400 DEG C;reducing the area of total air supply holes by 3-12%; reducing an oxygen rich amount by 30-60%, reducing the capacity by 8-20%, and blowing a sufficient cold air flow with complete force, and ensuringhot air pressure; loosening coal gas flows on edges, ensuring sufficient cold air flows, and ensuring symmetry of cold air flows and hot air pressure; increasing daily iron discharge times for 1-2 times; completely controlling temperatures of the crucible and side walls of the blast-furnace, carrying out comprehensive maintenance on the crucible of the blast-furnace, ensuring stable production ofthe blast-furnace, and prolonging the service life of the blast-furnace.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a comprehensive maintenance method for a blast furnace hearth and furnace bottom. Background technique [0002] With the continuous progress and development of blast furnace ironmaking technology, blast furnace technology has shown a trend of large-scale and automatic control. , so that both the fuel consumption and the smelting intensity of the blast furnace have been greatly improved compared with the past, and the economical efficiency of blast furnace smelting has also been further improved. [0003] However, after the smelting intensity and furnace capacity increase, the storage capacity and circulation velocity of molten iron in the hearth of the blast furnace will increase significantly compared with the past, making the static pressure and scouring force of the molten iron on the hearth and bottom of the furnace larger. The rising trend, the emergence of these unfavor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00C21B7/16
CPCC21B7/00C21B7/16
Inventor 赵立军王宝海唐继忠冯宝泽江治飞姜彦兵蒋益陈福振
Owner ANGANG STEEL CO LTD
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