Tundish EMS Stirrer and Flow Separator for Steel Cleanliness
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Solution Overview
Problem
Existing tundish technologies face challenges in efficiently removing small inclusions and achieving temperature homogenization, especially in tundishes with multiple strands, which affects the cleanliness and consistency of the molten metal.
Innovation Solution
The implementation of an EMS stirrer combined with flow separator devices such as dams, weirs, or baffles to define the stirring region and control the flow of molten metal, while optimizing the stirring direction and speed to minimize dead zones and enhance temperature homogenization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas purging is applied to increase mixing and inclusion removal, then steel cleanliness is improved, but temperature homogenization deteriorates
Solution Approach 1:
The patent combines EMS stirring with gas purging in a single integrated system. The EMS stirrer and gas purging devices work simultaneously to achieve both temperature homogenization and inclusion removal, eliminating the trade-off between these two functions that existed when they were used separately.
Solution Approach 2:
The EMS stirrer serves multiple functions: it homogenizes temperature, promotes inclusion removal through electromagnetic stirring, and works synergistically with gas purging. This multi-functional approach allows simultaneous achievement of temperature control and steel cleanliness without the compromises required by single-function systems.
2Temperature
If external electromagnetic stirrers are used to homogenize temperature, then temperature homogenization is improved, but inclusion removal deteriorates
Solution Approach 1:
The patent merges EMS stirring with gas purging technology into a unified system. The gas purging devices are strategically positioned to work in conjunction with the EMS stirrer, creating synergistic effects that simultaneously achieve temperature homogenization and effective inclusion removal, overcoming the limitations of using EMS alone.
Solution Approach 2:
Gas bubbles serve as an intermediary mechanism that enhances inclusion removal while the EMS stirrer provides temperature homogenization. The gas purging acts as a mediator that complements the electromagnetic stirring, creating a combined effect that addresses both temperature and cleanliness requirements.
3Productivity
If multiple coil devices are used to improve stirring effectiveness, then mixing is improved, but facility cost and complexity increase
Solution Approach 1:
The tundish is divided into distinct functional zones: an active stirring zone where the EMS stirrer operates to homogenize temperature and promote mixing, and a calm zone where gas purging occurs for inclusion removal. This segmentation allows effective use of a single EMS stirrer without requiring multiple coil devices, reducing facility complexity while maintaining mixing effectiveness.
Solution Approach 2:
Different regions of the tundish are assigned different functions with appropriate treatments. The active stirring zone receives EMS to achieve temperature homogenization, while the calm zone utilizes gas purging for inclusion removal. This localized approach optimizes the performance of a single EMS stirrer and reduces the need for multiple expensive coil devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the volume fraction of inclusions, particularly small ones, minimizes dead zones, achieves excellent temperature homogenization, and reduces slag entrapment, thereby improving the overall cleanliness and consistency of the molten metal.
Implementation Method 1
an electromagnetic stirrer which stirs the molten metal in order to distribute heated molten metal in the tundish
Implementation Method 2
the molten steel is flown in swirl fashion in the horizontal direction by a magnetic field generated by the coil device
Implementation Method 3
a plasma heating device between both nozzles of a ladle and a tundish
Implementation Method 4
a coil device is arranged for flowing the molten steel in the swirl flow bath in swirl fashion
Implementation Method 5
the molten steel in the swirl flow bath of the tundish is flown in swirl fashion in the horizontal direction by a magnetic field generated by the coil device
Implementation Method 6
The non-metallic foreign matter in the molten steel is forcedly floated up on the parabolic surface portion of the molten steel, which is removed by an appropriate means
Data Source
Figure 1
Figure 2
Figure 3~4b
AI summary
The present invention provides a tundish for continuous casting, the tundish having an inner volume comprising an inlet portion comprising an inlet for receiving molten metal, an outlet portion comprising at least one outlet for discharging molten metal, and a flow separator. The tundish further comprises an EMS stirrer for electromagnetic stirring, wherein, the flow separator is positioned between, the inlet portion and the outlet portion, the EMS stirrer is disposed outside of the tundish, at a vertical position below the top of the inner volume of the tundish and above the bottom of the inner volume of the tundish, the EMS stirrer is disposed to make the molten metal in the outlet portion flow in a horizontal direction, and the flow which is directly induced by the EMS stirrer flows away from the inlet.