Woven Electrostatic Oil Precipitator Element for Arcing Prevention
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Solution Overview
Problem
Conventional electrostatic precipitators face safety issues due to high voltages required for effective particle separation, which can lead to arcing and ignition risks in applications like gas turbine engines, and are inefficient in separating oil from oil/gas mixtures.
Innovation Solution
An electrostatic precipitator using a mesh of insulated conductors arranged to create alternating electric fields, allowing oil particles in an oil/air mixture to be attracted and accumulated on insulated surfaces without neutralization, utilizing AC or controlled DC voltages to manage electric field polarity and magnitude, thereby reducing the risk of arcing and improving separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high DC voltage is applied to a central electrode to create a corona discharge for particle separation, then particle separation efficiency is improved, but arcing and ignition risks increase
Solution Approach 1:
The patent divides the single high-voltage electrode into multiple low-voltage electrodes arranged in a mesh pattern. Instead of using one central electrode at high voltage, the invention uses many small electrodes at lower voltages (e.g., 1-5 kV each) that collectively provide the necessary electric field strength for particle separation without creating dangerous arcing conditions.
Solution Approach 2:
The patent transitions from a single-point high-voltage electrode to a two-dimensional mesh array of low-voltage electrodes. This dimensional change allows the electric field to be distributed across many points in space, maintaining effective separation while reducing the voltage stress at any single location that would cause arcing.
2Productivity
If high voltage is used to achieve high electric field strength for effective separation, then separation efficiency is improved, but safety issues arise
Solution Approach 1:
The patent segments the high-voltage requirement into multiple low-voltage components. By using many small electrodes each operating at safe low voltages, the system achieves the cumulative electric field strength needed for effective separation while maintaining safety through distributed low-voltage operation.
Solution Approach 2:
The patent changes the voltage parameter from high single-value DC voltage to lower multi-phase AC or DC voltages. This parameter change allows the electric field strength to be maintained through geometric arrangement rather than voltage magnitude alone, improving safety while preserving separation efficiency.
3Productivity
If conventional electrostatic precipitation is used for oil/air separation, then separation function is achieved, but arcing occurs in flammable environments
Solution Approach 1:
The patent applies segmentation by replacing the conventional single high-voltage electrode with a mesh of many low-voltage electrodes. This segmentation eliminates arcing in flammable environments by keeping individual electrode voltages below the arcing threshold while collectively providing sufficient electric field for oil particle separation.
Solution Approach 2:
The patent creates an inherently safe operating environment by using low voltages that cannot produce sparks or arcs, effectively creating an 'inert' electrical environment that cannot ignite flammable oil vapors, similar to how inert gases prevent combustion.
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 separates oil from air using lower voltages, eliminating arcing risks and enhancing separation efficiency while allowing for safe operation in environments prone to ignition, such as gas turbine engines.
Implementation Method 1
particulate matters suspended in the aerosol flow are electrostatically attracted to at least one of the first, second and third conductors when said electric field is present
Implementation Method 2
a high DC voltage is applied to a central electrode positioned in a grounded casing in order to cause a corona discharge to develop between the central electrode and the conductive interior surface of the casing
Data Source
AI summary
An electrostatic precipitator element includes preferably a mesh made of at least two individually insulated conductors with defined openings therebetween. An electrical field in the openings electrostatically attracts suspended particulate to a respective conductor for collection.