Dynamic tapping control method and device for eccentric furnace bottom of converter

An eccentric furnace bottom and control method technology, applied in the field of metallurgy, can solve the problems of large amount of slag, molten steel suction and secondary oxidation, etc., to reduce the tapping time, improve work efficiency, and avoid molten steel suction and secondary oxidation. The effect of secondary oxidation

Active Publication Date: 2020-11-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a dynamic tapping control method and device for the eccentric furnace bottom of the converter, which can solve the problems of large amount of slag dropping and liquid steel suction and secondary oxidation in the existing tapping scheme, and realize rapid and protective Tapping, to provide more pure molten steel for the next production process

Method used

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  • Dynamic tapping control method and device for eccentric furnace bottom of converter
  • Dynamic tapping control method and device for eccentric furnace bottom of converter
  • Dynamic tapping control method and device for eccentric furnace bottom of converter

Examples

Experimental program
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Effect test

Embodiment 1

[0107] In the specific embodiment of the present invention, the dynamic tapping method of the eccentric furnace bottom of the converter is as follows: Figure 7 As shown, for the 120t drum spherical converter, the following steps are taken when the smelting is finished and the steel is ready to be tapped:

[0108] (1) Turn the converter to 30°, and turn the taphole to the lowest point, in a vertical state, and perpendicular to the horizontal plane, such as Figure 6 shown.

[0109] (2) Calculate the thickness of the slag and calibrate the height of the molten steel pool:

[0110] First, collect the material information of the current heat, the specific information is:

[0111] Table 1 The amount of raw and auxiliary materials added

[0112]

[0113] Table 2 Metal Material Component Parameters

[0114] type C Si mn P S T molten iron 4.5 0.3425 0.163 0.1196 0.0254 1386 scrap steel 0.18 0.2 0.92 0.023 0.025 25 TSO test 0.111 0...

Embodiment 2

[0152] This embodiment is similar to Embodiment 1, but for a 200t converter, its dynamic tapping operation can be simply described as:

[0153] (1) Turn the converter to 32° so that the tapping hole is at the lowest point, perpendicular to the horizontal plane.

[0154] (2) Extract the charging information and end point information of the current heat, calculate the initial slag thickness to be 0.092m, and calibrate the initial molten steel liquid level height to be 1.25m.

[0155] (3) The diameter of the tap hole is 20.35cm. Select a protective casing with a diameter of 30.5cm, put it on the tapping hole, move the ladle car to the right below the tapping hole, use the ladle car elevator to raise the height of the ladle, make the protective casing immerse 0.5m inside the ladle, and turn on the argon gas in the ladle Bottom blow.

[0156] (4) At the end of converter smelting, the temperature drop rate is 10°C / min, the molten steel temperature measured based on TSO is 1710°C, ...

Embodiment 3

[0162] This embodiment is similar to Embodiment 1, but for the 300t converter, its dynamic tapping operation can be simply described as:

[0163] (1) Turn the converter to 35° so that the tapping hole is at the lowest point, perpendicular to the horizontal plane.

[0164] (2) Extract the charging information and end point information of the current heat, calculate the initial slag thickness to be 0.112m, and calibrate the initial molten steel liquid level height to be 1.65m.

[0165] (3) The diameter of the tapping hole is 24.25cm. Select a protective casing with a diameter of 36.5cm and put it on the tapping hole. Move the ladle car to the right below the tapping hole, and use the ladle car lift to raise the height of the ladle so that the protective casing Immerse at 0.5m inside the ladle, and start the argon bottom blowing of the ladle.

[0166] (4) At the end of converter smelting, the temperature drop rate is 10°C / min, the molten steel temperature measured based on TSO i...

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Abstract

The invention provides a dynamic tapping control method and device for an eccentric furnace bottom of a converter, and relates to the technical field of metallurgy. The method and device can solve theproblems of large slagging amount and molten steel suction and secondary oxidation in an existing tapping scheme, realizes rapid and protective tapping, and is convenient for providing purer molten steel for the next production process. The method comprises the steps that S1, after converter blowing is finished, a converter body is rotated to rotate a tapping hole to the lowest position; the tapping hole is formed in the furnace eccentric area and keeps away from the low blowing area; S2, smelting data and component data are read, and the opening size of the drift diameter of the steel tapping hole is calculated; S3, a protective sleeve is installed at the tapping hole, and a steel ladle is in place; S4, the tapping hole is opened, and tapping is conducted under the protective atmosphere;S5, the tapping hole is closed when the liquid level of molten steel in the converter is reduced to a preset height; and S6, slag splashing furnace protection is conducted, and tapping is finished; The steel ladle is a lifting type steel ladle, and a protective atmosphere bottom blowing structure is arranged in the steel ladle. The dynamic tapping control device is suitable for the smelting and tapping process.

Description

【Technical field】 [0001] The invention relates to the technical field of metallurgy, in particular to a method and device for controlling dynamic steel tapping at the eccentric furnace bottom of a converter. 【Background technique】 [0002] At present, the converter adopts the trough-type tapping method, and the tapping port is set at the junction of the furnace cap and the furnace body. In order to reduce the amount of slag during tapping, most of the current converters adopt the method of adding a slag blocking device during the tapping process to reduce the amount of slag. When molten steel is smelted and ready to be tapped, the ladle car moves to the tapping position, and the converter is turned to tap. When the remaining molten steel in the converter is 30% to 50% of the total amount of molten steel, a slag-stop rod is added. When the molten steel is finished, the converter tilts. When turning to -40°~-20°, add the slag blocking cap. After taking these measures, the am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/46
CPCC21C5/28C21C5/4653
Inventor 包燕平高放
Owner UNIV OF SCI & TECH BEIJING
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