Automatic liquid level control method for crystallizer of large square bland continuous-casting machine

A liquid level control and crystallizer technology, applied in the field of metallurgical steelmaking, can solve the problems of inactive crystallizer liquid level, narrow slag line erosion range, poor surface quality of cast slabs, etc. speed, the effect of improving continuous pouring time

Active Publication Date: 2012-01-25
石钢京诚装备技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the set liquid level is a constant value, it is easy to have a narrow range of slag line erosion and a high rate of nozzle melting loss, especially when using an integral nozzle for pouring, the life of the nozzle directly determines the service life of the tundish, and the rate of nozzle melting loss is large, seriously It restricts the service life of the tundish and greatly increases the cost of refractory materials for the tundish
In addition, the copper tube wall of the mold at the meniscus position is eroded and corroded by the steel slag interface for a long time, which may easily cause the coating on the inner wall of the meniscus copper tube to fall off and the taper change, thereby affecting the surface and subcutaneous quality of the billet.
Due to the large cross-section of the bloom, the casting speed is relatively low, the liquid level of the mold is not active, and the problems of rapid erosion of the submerged nozzle and poor surface quality of the slab are particularly prominent.

Method used

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  • Automatic liquid level control method for crystallizer of large square bland continuous-casting machine
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  • Automatic liquid level control method for crystallizer of large square bland continuous-casting machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The section of the bloom continuous caster is 300mm×360mm, and the steel grade 40Cr is produced. The continuous casting process parameters are shown in the following table:

[0025]

[0026] During the process of pouring steel, observe the liquid level of the continuous casting mold. The liquid level of the 1-stream mold is not active, and the spreading of the mold powder is poor. The mold powder in the mold is thick in the middle (45mm) and thin on both sides (20mm). Measure the thickness of the liquid slag layer 8-10mm, mold slag consumption 0.40kg / t; 3-flow mold is active, mold slag spreads well, mold slag thickness is uniform (28~32mm), melting is uniform, measuring thickness of liquid slag layer is 8-10mm, protection The slag consumption is 0.43kg / t;

[0027] Measured at the watering stop, the width of the slag line of the 1 flow port is 12mm, and the width of the slag line of the 3 flow port is 25mm; the remaining thickness of the slag line of the 1 flow por...

Embodiment 2

[0029] Example 2: The section of the bloom continuous caster is 300mm×360mm, and the steel grade 20CrMnTi is produced. The continuous casting process parameters are shown in the following table:

[0030]

[0031] During the process of pouring steel, observe the liquid level of the continuous casting mold. The liquid level of the 1-stream mold is active, the mold slag spreads well, the mold slag thickness is uniform (30~34mm), and the melting is uniform. The thickness of the liquid slag layer is measured to be 8-10mm for protection. The slag consumption is 0.45kg / t; the liquid level of the 3-stream crystallizer is not active, and the spreading of the mold powder is poor. The mold powder in the mold is thick (48mm) in the middle and thin on both sides (23mm). The thickness of the measured liquid slag layer is 8-10mm, protecting The slag consumption is 0.48kg / t;

[0032] Measured at the watering stop, the width of the slag line of the 1 flow port is 26mm, and the width of the slag lin...

Embodiment 3

[0034] Example 3: The section of the bloom continuous caster is 300mm×360mm, and the steel grade GCr15 is produced. The continuous casting process parameters are shown in the following table:

[0035]

[0036] During the process of pouring steel, observe the liquid level of the continuous casting mold. The liquid level of the 1-stream mold is active, the mold slag spreads well, the mold slag thickness is uniform (32~37mm), and the melting is uniform. The thickness of the liquid slag layer is measured to be 9-11mm, protection The slag consumption is 0.25kg / t; the liquid level of the 3-stream crystallizer is not active, and the spreading of the mold powder is poor. The mold powder in the mold is thick in the middle (52mm) and thin on both sides (29mm). The thickness of the measured liquid slag layer is 9-11mm, protecting Slag consumption is 0.23kg / t;

[0037] Measured at the water stop, the width of the slag line at the 1 flow port is 28mm, and the width of the slag line at the 3 flo...

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Abstract

The invention relates to an automatic liquid level control method for a crystallizer of a large square bland continuous-casting machine, and belongs to the metallurgical steel-making technical field. According to the technical scheme, the automatic liquid level control method comprises the following steps: firstly setting a liquid level output value to be a sinusoidal variation curve; secondly controlling the actual liquid level value to change according to the set liquid level output value by a PID (proportion integration differentiation) control module in a liquid level control program of acomputer so as to finally realize sinusoidal liquid level control of the crystallizer. The automatic liquid level control method has the beneficial effects that by programming and setting the controlmodule, the actual liquid level value of the crystallizer is changed according to the set liquid level value as well as the change cycle and amplitude so as to realize sinusoidal liquid level controlon the crystallizer, thereby effectively reducing the erosion rate of a submersed nozzle of a large square bland, prolonging the continuous casting time and improving the surface quality of casting blank. Statistical data shows that the automatic liquid level control method has obvious effect of prolonging the service life of the nozzle and the continuous casting time; and meanwhile as the liquidlevel of the crystallizer is active and casting powder has good slagging effect, the repair rate of the (casting) blank and (steel) products caused by surface defects is lowered.

Description

Technical field [0001] The invention relates to an automatic control method for the mold liquid level of a bloom continuous casting machine, in particular to a method for reducing the erosion rate of the bloom immersion nozzle, extending the continuous casting time, activating the bloom mold liquid level and improving the surface of the continuous casting billet The new quality automatic control method of crystallizer liquid level belongs to the technical field of metallurgical steelmaking. Background technique [0002] In the field of metallurgical steelmaking technology, the liquid level control principle of the background technology is: the set value of the liquid level is a constant, and the actual value of the liquid level is adjusted by PID according to the set value to achieve the function of stabilizing the liquid level of the mold. Since the liquid level is set to a constant value, the slag line erosion range is narrow and the nozzle melting loss rate is high. Especi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18
Inventor 董大西李国栋高晗陈良勇韩伟赵战强
Owner 石钢京诚装备技术有限公司
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