Electrostatic Separation Device With High Dielectric Resin
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Solution Overview
Problem
Conventional electrostatic separation devices face challenges in separating coal ash with high unburned carbon concentrations (15% to 30%) due to spark generation and deteriorated insulation properties, leading to poor separation performance.
Innovation Solution
The use of high dielectric resin elements in the electrostatic separation device, including resin rod and flat plate electrodes, along with air supply and powder removal mechanisms, prevents spark generation and maintains separation performance by controlling electron flow and powder adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic separation devices are used to separate coal ash with high unburned carbon concentrations (15% to 30%), then separation process can be maintained, but spark generation occurs and insulation property deteriorates leading to poor separation performance
Solution Approach 1:
A high dielectric resin rod is introduced as an intermediary element between the power source and the electrode. This resin rod acts as a mediator that prevents direct contact between conductive particles and the power source, thereby eliminating spark generation while maintaining the electrostatic separation function. The high dielectric property of the resin blocks the path for electrical discharge.
Solution Approach 2:
The dielectric constant of the electrode structure is changed by incorporating high dielectric resin. This parameter change increases the insulation capability of the system, allowing it to handle higher concentrations of conductive unburned carbon without experiencing spark generation or insulation deterioration.
2Reliability
If high dielectric resin elements are introduced to prevent spark generation, then insulation property is maintained, but device complexity increases
Solution Approach 1:
The high dielectric resin rod serves multiple functions simultaneously: it acts as an insulator to prevent spark generation, as a structural support element, and as part of the electrode assembly. By combining these functions into a single component, the overall device complexity is minimized while achieving the desired insulation improvement.
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
Stable separation of high and low unburned carbon ash is achieved without spark generation, enabling the reuse of high unburned carbon ash as fuel and low unburned carbon ash as concrete auxiliary material.
Implementation Method 1
providing a high dielectric resin element in a circuit for applying a voltage between the lower side electrode and the upper side electrode
Implementation Method 2
separates unburned carbon ash contained in coal ash by an electrostatic force
Data Source
AI summary
The present invention provides an electrostatic separation method and an electrostatic separation device each of which, even in a case where the concentration of unburned components of coal ash produced by a boiler of a coal-fired power plant is as high as 15% to 30%, can stably separate the ash without generating spark, reuse the high unburned component ash as fuel, and reuse the low unburned component ash as, for example, an auxiliary material of concrete. The electrostatic separation device may include a substantially flat plate lower side electrode and an upper side electrode including a high dielectric resin element. A separation zone is formed in a region of electrostatic force between the lower side electrode and the upper side electrode, with one of the electrodes having positive polarity and the other having negative polarity. Unburned carbon ash in the coal ash supplied to the separation zone is separated.