Segmented Counter Electrodes for Precipitator Ozone Control
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Solution Overview
Problem
Long-term operation of precipitators leads to ozone generation, causing irritating odors and discomfort, while maintaining high dust collection efficiency is challenging without increasing discharge current.
Innovation Solution
A charging apparatus with counter electrodes of varying electrode areas and high voltage electrodes with specific geometric configurations, such as wire-shaped high voltage electrodes and plate-shaped counter electrodes with through holes, is used to improve charging efficiency while suppressing ozone concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discharge current is increased to maintain high dust collection efficiency, then dust collection efficiency is improved, but ozone concentration increases causing irritating odors and discomfort
Solution Approach 1:
The counter electrode is divided into multiple segments with different electrode areas (first counter electrode with larger area, second counter electrode with smaller area). This segmentation allows different regions to serve different functions: the larger area counter electrode collects more ions to maintain dust collection efficiency, while the smaller area counter electrode reduces ozone generation by limiting the discharge current in that region.
Solution Approach 2:
Different counter electrodes are designed with different electrode areas to create local variations in the electric field distribution. The first counter electrode has a larger electrode area to enhance ion collection in regions requiring higher charging efficiency, while the second counter electrode has a smaller electrode area to suppress ozone generation in regions where lower discharge current is desirable.
2Object-generated harmful factors
If discharge current is reduced to suppress ozone concentration, then ozone concentration is decreased, but dust collection efficiency deteriorates
Solution Approach 1:
The counter electrode is divided into multiple segments with different electrode areas (first counter electrode with larger area, second counter electrode with smaller area). This segmentation allows different regions to serve different functions: the larger area counter electrode collects more ions to maintain dust collection efficiency, while the smaller area counter electrode reduces ozone generation by limiting the discharge current in that region.
Solution Approach 2:
Different counter electrodes are designed with different electrode areas to create local variations in the electric field distribution. The first counter electrode has a larger electrode area to enhance ion collection in regions requiring higher charging efficiency, while the second counter electrode has a smaller electrode area to suppress ozone generation in regions where lower discharge current is desirable.
3Productivity
If counter electrode area is increased to improve ion collection, then charging efficiency is improved, but device complexity increases due to multiple counter electrodes with different areas
Solution Approach 1:
The counter electrode is divided into multiple segments with different electrode areas (first counter electrode with larger area, second counter electrode with smaller area). This segmentation allows different regions to serve different functions: the larger area counter electrode collects more ions to maintain dust collection efficiency, while the smaller area counter electrode reduces ozone generation by limiting the discharge current in that region.
Solution Approach 2:
The counter electrodes are designed with asymmetric areas where the first counter electrode has a larger electrode area and the second counter electrode has a smaller electrode area. This asymmetric design optimizes the electric field distribution to simultaneously achieve high charging efficiency in certain regions and low ozone generation in other regions, resolving the technical contradiction between productivity and harmful factors.
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 enhances dust collection efficiency at lower discharge currents, maintaining high performance while keeping ozone levels below environmental standards.
Implementation Method 1
a high voltage of several kV is applied to generate a discharge between a high voltage (discharge) electrode and a counter (ground) electrode
Implementation Method 2
a precipitator to charge suspended particles by using a discharge... and a dust collector collecting charged suspended particles
Data Source
AI summary
Disclosed herein is a charging apparatus and precipitator. The charging apparatus includes a plurality of counter electrodes formed in a plate shape and arranged in a direction intersecting with a ventilation direction to allow respective surfaces thereof to follow the ventilation direction, and a plurality of high voltage electrodes formed in a wire shape and installed between the plurality of counter electrodes. The plurality of counter electrodes includes a first counter electrode having a first electrode area, and a second counter electrode having a second electrode area less than the first electrode area. The first counter electrode and the second counter electrode are alternately arranged.