Dual Electromagnetic Stirrer Units for DC Arc Furnace Melt Homogenization
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Solution Overview
Problem
Existing electromagnetic stirring systems for steel melts in DC electrical arc furnaces are inflexible and unable to provide adequate stirring due to the large size of the bottom electrode, limiting stirrer positioning and efficiency, and prior systems are not dynamically controllable or cost-effective.
Innovation Solution
The use of two electromagnetic stirrer units mounted on opposite sides of the outer bottom surface of the DC electrical arc furnace, connected to a single current supply and control unit, allowing for flexible positioning, dynamic control, and energy-efficient operation, with optional shielding and pancake winding designs to optimize stirring forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single electromagnetic stirrer unit is mounted at the central position below the bottom of the furnace, then the stirring coverage is maximized, but the device cannot be installed in DC furnaces with large bottom electrodes
Solution Approach 1:
The patent divides the electromagnetic stirring system into multiple separate stirrer units (at least two) mounted on opposite sides of the bottom surface, rather than using a single centralized unit. This segmentation allows the system to adapt to DC furnaces with large bottom electrodes where a single central stirrer cannot be installed, while still achieving comprehensive stirring coverage through the combined effect of multiple distributed units.
2Device complexity
If prior art stirrer units are used, then the structure is simple, but the stirring effectiveness is insufficient and the system is inflexible for different applications
Solution Approach 1:
The patent implements dynamic control of the electromagnetic stirrer units through a control unit that can independently regulate each stirrer's operation. This allows the system to adapt to different stirring requirements, process phases, and application scenarios, providing flexible and effective stirring while maintaining relatively simple individual stirrer structures.
3Stability of the object's composition
If electromagnetic stirring is implemented in DC furnaces, then melt homogenization is improved, but energy consumption increases
Solution Approach 1:
The patent employs multiple electromagnetic stirrer units distributed at opposite sides of the bottom surface, creating localized stirring zones that collectively achieve comprehensive melt homogenization. This distributed approach improves stirring efficiency and reduces overall energy consumption compared to a single high-power central stirrer, as each unit operates at optimized local intensity.
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
Enables strong and flexible electromagnetic stirring in DC furnaces with reduced energy consumption, allowing for various stirring patterns and operations during different phases of the process cycle, addressing the limitations of prior systems.
Implementation Method 1
electromagnetic stirring (EMS) of the steel melt in electrical arc furnaces
Implementation Method 2
electromagnetic stirrer units... provide strong stirring forces
Implementation Method 3
Each of the cores may be provided with a shield, e.g. made of aluminum or other non-magnetic material... Such shield reduces the electromagnetic field on the bottom surface and the side surfaces of the core
Data Source
AI summary
An apparatus for electromagnetic stirring of the steel melt in an electrical arc furnace includes two electromagnetic stirrer units, a current supply, and a control unit. The two stirrers are mounted on an outer bottom surface of the electrical arc furnace at opposites sides of a central position of the bottom surface, the current supply is operatively connected to the two electromagnetic stirrer units, and the control unit is operatively connected to the current supply to control the operation of the two electromagnetic stirrer units.