Inductive Mixing Device for Rapid High-Temperature Heating
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Solution Overview
Problem
Existing mixing devices are limited in their ability to rapidly heat materials to high temperatures due to constraints in heat transfer medium properties and heating rates, which restricts the achievement of high wall temperatures and uniform heating.
Innovation Solution
The mixing device uses an electrically conductive container with coils excited by an alternating electric field to induce eddy currents for direct heating, allowing for targeted and rapid temperature increase without relying on pre-heated heat transfer media, and includes a movable stripping device to prevent material adherence and enhance emptying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating casing with heat transfer medium is used, then heating of the material to be mixed is enabled, but the maximum wall temperature is limited by the maximum permissible temperature of the heat transfer medium or the compression strength of the double casing
Solution Approach 1:
The patent replaces the thermal conduction-based heating system (heating casing with heat transfer medium) with an electromagnetic induction heating system. The induction heating device generates an alternating magnetic field that induces eddy currents directly in the electrically conductive container, converting electromagnetic energy to thermal energy within the container itself. This eliminates the need for a heat transfer medium and removes the temperature limitations imposed by the medium's physical properties or the casing's compression strength.
2Temperature
If a heating casing with heat transfer medium is used, then heating of the material to be mixed is enabled, but the heating rate is limited by the heat transfer coefficient from the liquid or vapour phase to the container wall and the pressure losses and thus the flow speed of the heat transfer medium in the heating casing
Solution Approach 1:
The patent replaces the thermal conduction-based heating system with electromagnetic induction heating. The induction heating device generates an alternating magnetic field that directly induces eddy currents in the electrically conductive container, converting electromagnetic energy to thermal energy within the container itself. This eliminates the need for a heat transfer medium and removes the temperature limitations imposed by the medium's physical properties or the casing's compression strength.
3Temperature
If traditional heating methods are used, then heating of materials is achieved, but fast heating curves up to very high wall temperatures cannot be implemented
Solution Approach 1:
The patent replaces the thermal conduction-based heating system with electromagnetic induction heating. The induction heating device generates an alternating magnetic field that directly induces eddy currents in the electrically conductive container, converting electromagnetic energy to thermal energy within the container itself. This eliminates the need for a heat transfer medium and removes the temperature limitations imposed by the medium's physical properties or the casing's compression strength.
Solution Approach 2:
The patent changes the fundamental heating mechanism from thermal conduction through a heat transfer medium to electromagnetic induction. By adjusting parameters such as the frequency and amplitude of the alternating magnetic field, the system can achieve rapid heating curves up to very high wall temperatures without being constrained by the physical properties of heat transfer media or the compression strength of the container casing.
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 solution enables fast and uniform heating of materials to temperatures exceeding 200°C, overcoming limitations of traditional heating methods by controlling heating power and distribution, and ensuring efficient material processing with reduced heat loss and improved emptying operations.
Implementation Method 1
the heating device has at least one coil which can be excited by an electric alternating field and which is so arranged that eddy currents are produced in the electrically conductive material of the container by the magnetic field change which occurs when the current flow changes
Implementation Method 2
Those eddy currents provide an increase in the temperature of the container. That inductive heating of the container permits targeted, direct heating of the container and thus the material to be mixed
Data Source
AI summary
The present invention concerns a mixing device having a preferably rotating container for accommodating material to be mixed, at least one mixing tool arranged in the interior of the container and a heating device for heating the material to be mixed. To provide a mixing device of the kind set forth in the opening part of this specification which permits the fastest possible heating of the material to be mixed, preferably also to temperatures higher than 200° C., it is proposed in accordance with the invention that the container at least partially comprises an electrically conductive material and the heating device has at least one coil which can be excited by an electric alternating field and which is so arranged that eddy currents are produced in the electrically conductive material of the container by the magnetic field change which occurs when the current flow changes.