A method and device for controlling dynamic steel tapping at the eccentric furnace bottom of a converter

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

Active Publication Date: 2022-04-22
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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  • A method and device for controlling dynamic steel tapping at the eccentric furnace bottom of a converter
  • A method and device for controlling dynamic steel tapping at the eccentric furnace bottom of a converter
  • A method and device for controlling dynamic steel tapping at the eccentric furnace bottom of a converter

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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 the eccentric furnace bottom of a converter, which relates to the field of metallurgy technology, and can solve the problems of large amount of slag dropping, molten steel suction and secondary oxidation in the existing tapping scheme, and realize fast, Protect the tapping, so as to provide more pure molten steel for the next production process; the method includes: S1, after the converter blowing is completed, turn the furnace body to turn the tapping port to the lowest position; the tapping port is set in the eccentric area of ​​the furnace, And avoid the low-blowing area; S2, read the smelting data and composition data, calculate the opening size of the tap hole diameter; S3, install the protective sleeve at the tap hole, and make the ladle in place; S4, open the tap hole , tapping under a protective atmosphere; S5, closing the tapping hole when the molten steel level in the converter drops to a preset height; S6, splashing slag to protect the furnace, and tapping is completed; the ladle is a lifting ladle with a protective atmosphere inside Bottom blown construction. The technical scheme provided by the invention is suitable for the process of smelting and tapping steel.

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 Patents(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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