Radio-Frequency Dielectric Heating for Concrete Component Separation
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Solution Overview
Problem
Current methods for recycling waste concrete are inefficient, expensive, and unsuitable for on-site operations, failing to effectively separate sand and gravel from the cement matrix and dehydrate cement components, leading to high energy consumption and environmental impact.
Innovation Solution
A system and method utilizing radio-frequency alternating or pulsed electric fields to heat and break down waste concrete using dielectric heating and dielectric breakdown, allowing for the separation of hydrated and dehydrated cement powder and clean sand and gravel without direct contact or water, using a modular design for scalability and portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conduction thermal treatment is used to separate concrete components, then the concrete can be heated and processed, but heat transmission is slow and non-selective, proceeding from outside towards inside, resulting in high energy consumption and low productivity
Solution Approach 1:
The patent replaces the mechanical conduction heating system with an electromagnetic field-based dielectric heating system. The concrete is heated by exposing it to an electromagnetic field that causes molecular vibration and friction within the material itself, eliminating the need for external heat conduction through furnace walls. This substitution enables rapid, selective, and uniform heating throughout the concrete volume simultaneously.
2Temperature
If gas furnaces are used for thermal treatment, then heating can be achieved, but greenhouse gases are released into the atmosphere, causing environmental pollution
Solution Approach 1:
The patent substitutes the chemical combustion process in gas furnaces with a physical electromagnetic field process. Instead of burning fuel to generate heat, the system uses dielectric heating where electromagnetic energy is directly converted into thermal energy within the concrete material through molecular friction, completely eliminating greenhouse gas emissions from the heating process.
3Temperature
If microwave dielectric loss treatment is used, then selective heating of water and hydroxy groups can be achieved, but high wattage (higher than 50 kW) is required, making the apparatus very expensive and bulky
Solution Approach 1:
The patent changes the electromagnetic field parameters from high-frequency microwaves to lower-frequency radio-frequency fields. This parameter change allows for more efficient energy coupling with the concrete material, achieving the same dielectric heating effect at lower power levels (below 50 kW). The lower frequency also improves penetration depth and reduces the complexity and cost of the generating apparatus.
4Manufacturing precision
If high-voltage electric discharges are used for separation, then qualitative separation of components can be achieved, but productivity is low (maximum of 4t/h), making it non-advantageous at industrial level
Solution Approach 1:
The patent implements a continuous processing system where concrete moves steadily through the electromagnetic field treatment zone, allowing uninterrupted processing at high throughput. Unlike batch processing methods, the continuous action maintains constant energy input and separation efficiency throughout the process, achieving both high productivity (20t/h) and quality separation of concrete components.
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
Achieves high productivity (20t/h) with efficient separation and dehydration of concrete components, reducing energy consumption and environmental impact, while being scalable and suitable for on-site operations.
Implementation Method 1
utilizing radio-frequency alternating or pulsed electric fields to heat and break down waste concrete using dielectric heating and dielectric breakdown
Implementation Method 2
causing, by means of said radio-frequency alternating electric field or said radio frequency-pulsed electric field which are created between said electrodes, the dielectric heating and dielectric breakdown of the crushed concrete present between said electrodes
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
System (10) for separating components of concrete, comprising at least one dielectric heating unit (20) comprising a capacitor (21) having two electrodes (21a, b) and powered by a respective high-voltage radio-frequency alternating electric field generator or by a respective high-voltage radio-frequency pulsed electric field generator. The capacitor (21) is configured to generate a radio-frequency alternating electric field or a radio-frequency pulsed electric field, respectively, which are confined between said electrodes (21a, b). The systema further comprises concrete loading means (60) and concrete conveying means (70), configured, respectively, to load crushed concrete into the system and convey it, along a direction of advancement (F), between the electrodes (21a,b) of the capacitor (21) of the at least one dielectric heating unit (20) so that said crushed concrete passes through said radio-frequency alternating electric field or said radio-frequency pulsed electric field.