Electrostatic Precipitator Charger Design to Reduce Ozone Generation
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Solution Overview
Problem
The miniaturization of electrostatic precipitators is challenging due to difficulties in making a thin dust collector while maintaining dust collection efficiency, and there is a risk of increased ozone generation when the charger is thin, especially when dealing with ultra-fine particles like PM 0.1, which are hard to charge and collect efficiently.
Innovation Solution
An electrostatic precipitator design with a charger having a high voltage electrode and a counter electrode, where the counter electrode is equipped with a resistor to suppress discharge current and has a volume resistivity of 10^14 Ω·cm or more and 10^18 Ω·cm or less, allowing the charger to be thinner while reducing ozone generation, and a dust collector positioned downstream to collect charged particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the charger is made thinner to facilitate miniaturization, then the device size is reduced, but ozone generation increases due to higher discharge current density
Solution Approach 1:
The counter electrode is designed with non-uniform conductivity distribution through coating materials with different volume resistivities in different regions. The upstream side uses high resistivity material to suppress ozone-generating discharge, while the downstream side uses low resistivity material to facilitate particle collection, creating local quality variations that resolve the contradiction between thin design and ozone control
Solution Approach 2:
The counter electrode employs composite material construction by coating conductive materials with different volume resistivities onto the electrode surface. This composite structure allows simultaneous achievement of ozone suppression in the upstream region and efficient particle collection in the downstream region, enabling thin charger design without excessive ozone generation
2Volume of moving object
If the charger is made thinner, then the device size is reduced, but dust collection efficiency decreases due to insufficient charging distance
Solution Approach 1:
Different regions of the counter electrode are assigned different conductivity characteristics: the upstream side uses high resistivity to control ozone, while the downstream side uses low resistivity to enhance electric field strength for efficient particle charging and collection, maintaining high productivity in a thin structure
Solution Approach 2:
The volume resistivity parameter of the counter electrode is varied spatially along the airflow direction, creating a gradient from high to low resistivity. This parameter change enables the thin charger to simultaneously suppress ozone upstream and maintain strong electric fields downstream for efficient ultra-fine particle collection
3Productivity
If high voltage is applied to generate discharge for charging particles, then dust collection efficiency improves, but ozone generation increases
Solution Approach 1:
The counter electrode creates local quality differences in discharge characteristics by using high resistivity material upstream to suppress ozone-generating corona discharge, while allowing controlled discharge downstream where it contributes to particle charging without excessive ozone production
Solution Approach 2:
The counter electrode with spatially varying resistivity acts as an intermediary that mediates between the high voltage electrode and the air flow, controlling the discharge process to minimize ozone generation while maintaining particle charging efficiency through region-specific conductivity management
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 design enables efficient collection of ultra-fine particles while keeping ozone generation below environmental standards, allowing for a thinner charger and improved collection efficiency.
Implementation Method 1
a charger (10) charging suspended particles by using a discharge generated between a high voltage electrode (11) and a counter electrode (12)
Implementation Method 2
a resistor (122) covering at least one surface of the conductor (121) facing the high voltage electrode (11), suppressing a discharge current between the high voltage electrode (11) and the counter electrode (12)
Implementation Method 3
a dust collector (20) collecting the charged suspended particles
Data Source
AI summary
Disclosed herein is provide an electrostatic precipitator capable of allowing a charger to be thin while suppressing ozone generation. The electrostatic precipitator 1 includes a charger 10 provided with a high voltage electrode 11 receiving a high voltage from a high voltage generating circuit 40 and a counter electrode 12 facing the high voltage electrode 11 and receiving a reference voltage from the high voltage generating circuit 40, and configured to charge suspended particles by generating a discharge between the high voltage electrode 11 and the counter electrode 12; and a dust collector 20 disposed in the downstream side of an air flow direction of the charger 10 and configured to collect the suspended particles charged by the charger 10.