External Launder Liquid Metal Circulation with Electromagnetic Pumping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metallurgical circulator devices face issues such as high costs, inefficient metal circulation, blockages due to dross and contaminants, and thermal shock risks, particularly with external electromagnetic stirring devices and passageways that are difficult to clean and preheat effectively.
Innovation Solution
A metallurgical apparatus utilizing an external launder with a heating system and an electromagnetic pump to circulate liquid metal efficiently, featuring a ceramic trough body with a thermally conductive refractory filler and adjustable flow control, allowing for non-turbulent flow and strategic metal distribution within the furnace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an external electromagnetic stirring device with permanent magnets is used, then metal circulation is achieved, but the magnetic field penetrates only to a fixed shallow depth and circulation efficiency is reduced
Solution Approach 1:
A refractory liner is introduced as an intermediary component between the electromagnetic stirring device and the metal bath. The liner is positioned to allow magnetic field penetration while protecting the device from thermal damage, enabling deeper and more effective magnetic field interaction with the metal circulation path.
Solution Approach 2:
The patent replaces traditional mechanical stirring mechanisms with an electromagnetic stirring system that uses magnetic fields to drive metal circulation. This substitution eliminates mechanical contact with the hot metal, allowing for more efficient and deeper penetration into the metal bath without physical degradation.
2Power
If melt passageways are designed to keep metal close to the magnetic rotor, then pumping effectiveness is improved, but the passageway shape is restricted to narrow U-shape and flow direction is dictated
Solution Approach 1:
The melt passageway system is segmented into multiple sections with varying cross-sectional areas. The passageway includes an enlarged section that provides expanded space for metal flow, allowing the system to maintain pumping effectiveness while gaining design flexibility and enabling various flow patterns beyond simple U-shapes.
3Productivity
If external passageways are used for metal circulation, then circulation is achieved, but the passageways cannot be preheated effectively and may become damaged by thermal shock or cause metal freezing
Solution Approach 1:
The passageway system incorporates integrated heating elements that preheat the passageways before metal is introduced. This preliminary heating action ensures the passageways are at appropriate temperature to receive hot metal, preventing thermal shock damage and metal freezing during circulation operations.
4Productivity
If traditional circulator devices are used, then metal circulation is achieved, but the devices become blocked by dross and contaminants and require difficult cleaning
Solution Approach 1:
The stirring and pumping functions are extracted from the metal bath and relocated to an external electromagnetic stirring device positioned above the bath. The device uses magnetic fields to circulate metal through external passageways, allowing easy access to the circulation path for cleaning and removal of dross and contaminants without disrupting the metal bath.
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
The solution enables economical and efficient metal circulation, preventing blockages and thermal damage, ensuring high-quality metal production by maintaining consistent temperature and directing flow effectively for improved heat absorption and melting times.
Implementation Method 1
The pumping device comprises an electromagnetic pump that generates a moving magnetic field within the flow channel to pump liquid metal along the flow channel
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A metallurgical apparatus comprises a vessel for holding a body of liquid metal and a circulating apparatus for circulating the body of liquid metal within the vessel. The vessel has a peripheral wall and a base, and the circulating apparatus comprises a launder that provides an open-topped flow channel and a pumping device for pumping liquid metal through the launder. The launder has an inlet end connected to a first opening in the peripheral wall and an outlet end connected to a second opening in the peripheral wall. The pumping device is configured to pump liquid metal through the launder so that liquid metal flows out of the vessel through the first opening and into the vessel through the second opening, thereby causing the body of liquid metal within the vessel to circulate.