Ladle changing liquid level compensation method for tundish of continuous casting machine
By determining the optimal full packing time is 180s during the bag replacement process of continuous casting machine, and using intelligent control algorithms to optimize molten steel compensation, the problems of decreasing molten steel purity and increasing inclusions are solved, and the quality of steel is improved.
Patent Information
- Application Number
- CN202510387513.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-11
AI Technical Summary
During continuous casting and packaging replacement, the purity of the molten steel decreases and the increase in inclusions leads to a decrease in the quality of the steel, especially when the continuous pouring of multiple furnaces increases the risk of slag and exposed molten steel.
Through the combination of simulation and practice, the optimal full packet time is determined to be 180s, and the traffic is senseless and controllable through intelligent control algorithms, and the full packet time of the intermediate packet is automatically controlled. Combined with simulation control and adaptive algorithms, the compensation process of the intermediate mold is optimized.
It effectively improves the purity of the molten steel, reduces the risk of rolling slag, and improves the passing rate of cast billet flaw detection, from 35% to 27%.
Smart Images
Figure FT_1 
Figure FT_2 
Figure FT_3
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of continuous casting processes in iron and steel metallurgy, and particularly relates to a method for compensating the liquid level during ladle change in a continuous caster tundish. Background Art
[0002] The process of changing the large ladle during continuous casting is an essential process for realizing continuous casting of multiple large ladles of molten steel. During this process, the inflow of molten steel from the interrupted large ladle into the tundish is stopped. The tundish liquid level height experiences changes from a high level to a low level and then to a high level. Therefore, the balanced and stable flow between the tundish and the mold is changed. During continuous casting with multiple furnace continuous pouring, the purity of the molten steel during the ladle change process decreases, the inclusions increase, bringing risks of slag entrainment and molten steel exposure, reducing the purity of the molten steel, and ultimately resulting in a decline in the quality of the steel. The process of changing the large ladle during continuous casting pouring has always been a shortcoming in continuous casting quality control. Summary of the Invention
[0003] The purpose of the present invention is to solve the problems of the decrease in the purity of molten steel and the increase in inclusions during ladle change in existing continuous casting, and provide a method for compensating the liquid level during ladle change in a continuous caster tundish, which can standardize and uniformly compensate the molten steel in the tundish, reduce the risks of slag entrainment and liquid level exposure, and improve the purity of the molten steel.
[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A method for compensating the liquid level during ladle change in a continuous caster tundish, the specific steps are as follows: (1) Determine the optimal full ladle time through a combination of simulation and practical statistics; (2) Manually control the full ladle speed of the tundish molten steel by adjusting the oil cylinder to meet the optimal full ladle time; (3) Analyze the tundish tonnage curve formed by the ladle nozzle control hydraulic system, PLC program, and operator control, formulate a simulation control, and develop an adaptive control algorithm with automatic value acquisition and overlimit jump-out for each continuous caster according to its characteristics; (4) Continuously correct the algorithm to perform intelligent control of the follow-up of the large ladle flow control target value, flow sensorless controllability, and exit under specific conditions, and automatically control the optimal full ladle time; (5) Statistically analyze the change in the flaw detection qualification rate of the cast billets after simulation control.
[0005] Furthermore, in step (1), the optimal full ladle time for a certain working condition is determined to be 180 s through a combination of simulation and practical statistics.
[0006] Furthermore, in step (2), the full ladle speed of the tundish molten steel is controlled to achieve the optimal full ladle time of 180 s.
[0007] Furthermore, in step (4), after the algorithm is corrected, the intelligent control realizes a simulation control full ladle time of 180 s.
[0008] Further, in the step (5), after comparing the change in the flaw detection qualification rate after 180 s of simulation control for the full ladle time, the proportion of unqualified tundish billets decreased from 35% to 27%.
[0009] In the technical solution of the present invention, through the combination of simulation and practice, it is obtained that 180 s is the optimal full ladle time, and 180 s is set as the standard control time, effectively avoiding the influence of different tundish changing times on the purity of molten steel; at the same time, through simulation control, under the premise of no flow sensor, the 180 s automatic control is realized, and the stability of the full ladle rising slope is improved. Description of the Drawings
[0010] Figure 1 It is a schematic diagram of the molten steel exposure behavior at a full ladle time of 97 s in this embodiment; Figure 2 It is a schematic diagram of the molten steel exposure behavior at a full ladle time of 120 s in this embodiment; Figure 3 It is a schematic diagram of the molten steel exposure behavior at a full ladle time of 184 s in this embodiment; Figure 4 It is a schematic diagram of the molten steel exposure behavior at a full ladle time of 300 s in this embodiment. Detailed Embodiments Embodiment
[0011] To make the present invention clearer and more understandable, the following further explains a tundish ladle change liquid level compensation method of a continuous casting machine of the present invention in conjunction with the drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0012] In this embodiment, taking a continuous casting machine as an example, its cross-section is 220*(1600~2300) mm, the tundish capacity is 40 tons, and the steel grades are pipeline, structure, and high strength.
[0013] A tundish ladle change liquid level compensation method for a continuous casting machine, characterized in that: (1) Refer to Figures 1 to 4 , simulate + practice tracking and comparing the molten steel exposure behavior at different tundish changing times for the full ladle time, and obtain that 180 s is the optimal full ladle time.
[0014] (2) Control the opening of the tundish nozzle by manually controlling the hydraulic cylinder to achieve a full ladle time of 180 s for the tundish.
[0015] (3) Analyzed the tundish tonnage curve formed by the ladle nozzle control hydraulic system, PLC program, and operator control, formulated a set of simulation control methods, and developed an adaptive control algorithm with automatic value acquisition and out-of-limit jump-out for each continuous caster. Through continuous correction, the intelligent control of the follow-up of the target value of the tundish flow control, flow sensorless control, and exit under specific conditions was fully realized, and the automatic control of the full ladle time was 180 s.
[0016] According to the method of the present invention, the ladle change was carried out 3000 times, and the ladle change simulation control was realized, with a success rate of 100%, and no problems of program disconnection and failure occurred.
[0017] In addition, the qualified rate of the continuous casting billet inspection corresponding to the ladle change was statistically analyzed. The proportion of the ladle change billets with unqualified inspection decreased from 35% to 27%, achieving obvious results.
[0018] In addition to the above embodiments, the present invention may have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.
Claims
1. A method for compensating the liquid level during tundish ladle change in a continuous casting machine, characterized in that: (1) Determine the optimal full ladle time through the combination of simulation and practical statistics; (2) Manually adjust the oil cylinder to control the full ladle speed of the molten steel in the tundish to meet the optimal full ladle time; (3) Analyze the tundish tonnage curve formed by the tundish nozzle control hydraulic system, PLC program and operator control, formulate simulation control, and develop an adaptive control algorithm with automatic value acquisition and out-of-limit jump-out for each continuous casting machine according to its characteristics; (4) Continuously correct the algorithm to perform intelligent control of the follow-up of the ladle flow control target value, flow non-sensing controllability and exit under specific conditions, and automatically control the optimal full ladle time; (5) Statistically analyze the change in the qualified rate of flaw detection of the cast billets after ladle change under simulation control.
2. The method for compensating the liquid level during tundish ladle change in a continuous casting machine according to claim 1, characterized in that: In the step (1), the optimal full ladle time under a certain working condition is determined to be 180 s through the combination of simulation and practical statistics.
3. The method for compensating the liquid level during tundish ladle change in a continuous casting machine according to claim 1 or 2, characterized in that: In the step (2), control the full ladle speed of the molten steel in the tundish to achieve the optimal full ladle time of 180 s.
4. The method for compensating the liquid level during tundish ladle change in a continuous casting machine according to claim 1 or 2, characterized in that: In the step (4), after the algorithm is corrected, intelligent control realizes the full ladle time of 180 s for simulation control.
5. The method for compensating the liquid level during tundish ladle change in a continuous casting machine according to claim 1 or 2, characterized in that: In the step (5), compare the change in the qualified rate of flaw detection after the full ladle time of 180 s for simulation control. The proportion of unqualified ladle change billets drops from 35% to 27%.