Magnetic Concentrator for Induction Heating Slab Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating devices for metal slabs in iron and steel making, such as transverse flow induction heating apparatuses, face challenges with high energy consumption, inefficient power transfer, and overheating issues, particularly affecting the edges of the slabs, leading to potential cracks and defects. These devices often require complex assembly and maintenance, and result in increased production costs and reduced productivity.
Innovation Solution
An induction heating device with a magnetic concentrator that extends beyond the width of the slab to concentrate the magnetic induction power towards the edges, using longitudinal tracts and connection tracts to direct the magnetic field internally, reducing energy dispersion and enhancing power transfer efficiency without moving inductor poles or increasing electric current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electric current supplied to the coils is increased to compensate for magnetic flow losses on the short sides, then the heating effect on the edges is improved, but energy consumption increases and coil overheating occurs
Solution Approach 1:
A magnetic concentrator made of ferromagnetic material is introduced as an intermediary between the coil and the slab. This concentrator captures and directs the magnetic flux that would otherwise be lost on the short sides of the coil, channeling it toward the slab edges. This allows effective edge heating without increasing the overall electric current, thus reducing energy consumption and preventing coil overheating
Solution Approach 2:
The magnetic concentrator is strategically positioned at specific locations (short sides and/or ends of the coil) to locally concentrate magnetic flux where it is most needed - at the slab edges. This creates a non-uniform distribution of magnetic field intensity that matches the non-uniform heat dissipation pattern of the slab, providing enhanced heating precisely where required without affecting the entire system uniformly
2Temperature
If the electric current is increased to achieve desired edge heating, then heating effectiveness is improved, but cooling requirements increase to prevent coil overheating
Solution Approach 1:
The magnetic concentrator acts as a flux-directing intermediary that improves heating efficiency without increasing current demand. By capturing and redirecting stray magnetic flux toward the slab edges, it achieves better edge heating while maintaining the same electrical load, thereby eliminating the need for enhanced cooling systems and reducing overall device complexity
3Temperature
If the feed speed of the slab is reduced to achieve required heating without increasing current, then heating effectiveness is improved, but productivity decreases
Solution Approach 1:
The magnetic concentrator creates localized regions of enhanced magnetic flux density at the slab edges, providing intensive heating precisely where heat dissipation is highest. This localized enhancement allows the slab to pass through the heating zone at normal high speeds while still achieving the required temperature rise at the edges, thereby maintaining productivity without sacrificing heating effectiveness
4Loss of energy
If magnetic concentrators are added to improve power transfer efficiency, then energy efficiency is improved, but assembly complexity and maintenance requirements increase
Solution Approach 1:
The magnetic concentrator is designed as a simple, inexpensive ferromagnetic component that can be easily manufactured and replaced. Its straightforward geometry and material requirements make it cost-effective, and its simple structure minimizes assembly complexity while maximizing power transfer efficiency
Solution Approach 2:
The magnetic concentrator modifies the magnetic circuit parameters by providing a low-reluctance path for magnetic flux. This parameter change efficiently directs flux toward the slab edges, improving power transfer without introducing complex mechanical or electrical systems that would increase assembly and maintenance burdens
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 effectively heats the edges of the slabs to the desired temperature, minimizing energy consumption, reducing maintenance needs, and increasing production speed while maintaining central heating, thus preventing cracks and improving product quality.
Implementation Method 1
The heating device is configured to heat slabs by means of electromagnetic induction
Implementation Method 2
The magnetic concentrator is configured to concentrate the power generated by the electric coil toward the slab, and in particular, but not only, towards and in correspondence of the longitudinal edges of the latter
Implementation Method 3
by means of electric currents induced in the slab, allow it to be heated by means of the Joule effect
Data Source
AI summary
A heating device and/or method to heat a slab, and in particular its edges, by electromagnetic induction, including an electric coil and a magnetic concentrator associated with the electric coil.