Inductor Device with Parallel Conductors for Uniform Melting
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Solution Overview
Problem
Melting furnaces with single-loop inductors or multiple parallel conductors face challenges in achieving uniform heating due to heterogeneous current density, leading to thermal disequilibrium and insufficient heating of the coldest regions, especially when dealing with materials that become more conductive at high temperatures.
Innovation Solution
The inductor device consists of a plurality of parallel conductors arranged in concentric layers, with ascending and descending portions of equal length, ensuring uniform current distribution and density across the molten load by maintaining conductors at varying altitudes, and utilizing helical shapes with conductive spacers and cooling channels to minimize electrical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-loop inductor or multiple parallel conductors are used, then the device structure is simple, but uniform heating cannot be achieved due to heterogeneous current density
Solution Approach 1:
The inductor is divided into multiple parallel conductors arranged in concentric circles, with each conductor segmented into ascending and descending portions. This segmentation allows current to be distributed more uniformly across different regions of the molten load, addressing the heterogeneous current density problem while maintaining structural simplicity.
Solution Approach 2:
The conductors are arranged in three-dimensional concentric layers with ascending and descending portions at different altitudes. This spatial arrangement in multiple dimensions ensures that conductors are positioned optimally relative to the molten load, achieving uniform current distribution and heating throughout the entire volume.
2Ease of manufacture
If conductors are positioned at fixed altitudes, then the construction is simple, but thermal equilibrium cannot be achieved due to preferential current flow
Solution Approach 1:
The conductors are designed with asymmetric ascending and descending portions arranged in concentric layers at different altitudes. This asymmetric configuration ensures that current flows uniformly across all conductors by preventing preferential flow paths, thereby achieving thermal equilibrium throughout the molten load.
Solution Approach 2:
Different portions of the conductors are positioned at different altitudes and orientations (ascending/descending) to match the local thermal and conductive characteristics of the molten load. This local optimization ensures uniform current density and heating in each region, achieving overall thermal equilibrium.
3Device complexity
If parallel conductors are used without wave configuration, then the construction is simpler, but current density remains heterogeneous leading to insufficient heating in coldest regions
Solution Approach 1:
The conductors are configured in wave-like patterns with ascending and descending portions that follow curved trajectories in concentric layers. This curved arrangement optimizes the magnetic field distribution and current density across the molten load, ensuring efficient heating throughout the entire volume, including the coldest regions.
Solution Approach 2:
The wave-like configuration of conductors creates dynamic current distribution patterns that adapt to the changing thermal and conductive properties of the molten load. This dynamic arrangement ensures continuous uniform heating and prevents formation of cold spots, maximizing heating efficiency.
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 configuration ensures uniform heating by allowing current to pass evenly through all conductors, addressing the issue of thermal inequilibrium and enhancing heating efficiency, particularly in furnaces used for vitrification of nuclear waste materials.
Implementation Method 1
a crucible (3), an inductor device surrounding the crucible and consisting of a plurality of parallel conductors having the extension of a loop or a circumference
Implementation Method 2
a current, whose density is heterogeneous, much larger facing the hot regions of the load 2 thrown into the crucible 3 (the upper region here), flows through the conductor 1
Data Source
AI summary
An improved melting furnace including a crucible and a plurality of parallel conductors of identical height surrounding the crucible having at least one descending portion (9) and one ascending portion (10). The benefit from this arrangement is that the conductors all have a portion located at each heating height which guarantees density uniformity of the currents flowing in the conductors even if the load of the crucible has superimposed regions for which the electrical resistivity is different.