Electrostatic Precipitator With Through-Hole Electrode
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Solution Overview
Problem
Conventional electrostatic precipitators face issues with clogging and re-entrainment of particulate matter due to high pressure loss and the need for large-capacity blowers, especially when dealing with submicron-sized particles in internal combustion engine exhaust gases, leading to frequent filter replacement and reduced collection efficiency.
Innovation Solution
An electrostatic precipitator design featuring a plate-shaped electrode with through holes, a discharge electrode, and a recovery gas flow that crosses the exhaust gas direction to collect and strip away particulate matter, using corona or barrier discharges to charge and move particles through the holes, reducing re-entrainment and eliminating the need for large extraction devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filtration device with fine pores is used to collect submicron-sized particulate matter, then collection efficiency is improved, but pressure loss increases and the device clogs frequently
Solution Approach 1:
The patent replaces the mechanical filtration system with an electrostatic precipitation system. Instead of using physical filters with fine pores to capture particles, the invention uses electric fields to charge particles and collect them on electrodes. This substitution eliminates the clogging problem inherent in mechanical filters while maintaining high collection efficiency for submicron particles, and significantly reduces pressure loss since there is no physical barrier to gas flow.
Solution Approach 2:
The invention changes the collection mechanism from physical filtration to electrostatic precipitation by applying high voltage to discharge electrodes. This parameter change (from mechanical to electrical field-based collection) allows the system to capture submicron particles efficiently without creating the pressure drop and clogging issues associated with fine-pore filters.
2Productivity
If a large-capacity blower is used to maintain gas flow through the filtration device, then gas flow is maintained, but the blower becomes prone to failure and increases device complexity
Solution Approach 1:
The patent eliminates the need for large-capacity blowers by replacing the mechanical filtration system with electrostatic precipitation. Since the electrostatic system does not require gas to pass through physical filters, there is no need for high-power blowers to overcome filter resistance, thereby eliminating blower failure risks and reducing mechanical complexity.
Solution Approach 2:
The invention extracts and removes the blower component from the system by replacing the filtration-based collection method with electrostatic precipitation. This extraction eliminates the reliability issues associated with large-capacity blowers while maintaining the ability to process exhaust gas effectively.
3Stability of the object's composition
If the gas flow rate is increased to prevent particle re-entrainment, then collection stability is improved, but pressure loss increases and particles may be stripped away
Solution Approach 1:
The patent replaces mechanical filtration with electrostatic precipitation, where charged particles are collected on electrodes through electrostatic attraction rather than physical filtration. This substitution allows gas to flow freely without resistance from filter media, eliminating pressure loss while maintaining collection stability through the electrostatic field's ability to capture particles regardless of flow velocity.
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 provides high dust collection performance without clogging or re-entrainment, even under high-blowing-rate conditions, and reduces the probability of failure by minimizing the use of large-capacity blowers and avoiding filter clogging, while maintaining low pressure loss and efficient particulate matter recovery.
Implementation Method 1
using corona or barrier discharges to charge and move particles through the holes
Implementation Method 2
using corona or barrier discharges to charge and move particles through the holes
Implementation Method 3
generates an electric discharge imparting a Coulomb force to the particulate matter
Data Source
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AI summary
Provided is an electrostatic precipitator that does not require a large-capacity extraction device when collecting a PM, demonstrates high dust collection performance which is free from clogging or re-entrainment under high-blowing-rate conditions, and has a low probability of malfunctioning. The apparatus includes a plate-shaped electrode (20) having formed therein a plurality of through holes that allow the PM to pass therethrough; a discharge electrode (30) disposed to face one surface of the plate-shaped electrode; a discharge generating unit that applies a voltage between the plate-shaped electrode and the discharge electrode and generates an electric discharge imparting a Coulomb force to the PM; a collection region that is formed on an opposite side of the plate-shaped electrode to a surface thereof facing the discharge electrode and collects the PM; a gas flow-through region (33) that is formed between the plate-shaped electrode and the discharge electrode and allows a PM-containing gas to flow therethrough; and a PM recovery unit (50) that causes a recovery gas to flow through in the collection region in a direction crossing the flow-through direction of the PM-containing gas and strips away and recovers the collected PM in a flow-through state of the PM-containing gas.