Segmented Counter Electrode 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
The charging apparatus features a second counter electrode with a higher opening degree on the leeward side, a narrower width in the ventilation direction, and specific geometric configurations for the high voltage electrode, such as a circular cross-section with arc-shaped corners, to improve charging efficiency while suppressing ozone concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discharge current is increased to improve 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 sections with different opening degrees. The first counter electrode has a first opening degree while the second counter electrode has a second opening degree that is larger than the first. This segmentation allows different regions to serve different functions: the first region maintains strong electric field for charging, while the second region with higher opening degree facilitates ion discharge and reduces ozone generation, thereby resolving the contradiction between dust collection efficiency and ozone concentration.
Solution Approach 2:
Different portions of the counter electrode are given different local properties through varying opening degrees. The first counter electrode portion has a smaller opening degree to concentrate electric field lines for effective particle charging, while the second counter electrode portion has a larger opening degree to allow ion escape and reduce ozone accumulation. This local differentiation enables simultaneous optimization of charging efficiency and ozone suppression without requiring uniform changes across the entire electrode.
2Object-generated harmful factors
If discharge current is reduced to suppress ozone concentration, then ozone concentration is suppressed, but dust collection efficiency decreases
Solution Approach 1:
The counter electrode is segmented into regions with different opening degrees to decouple the functions of ozone suppression and dust collection. The first region with smaller opening degree maintains sufficient electric field strength for particle charging even at reduced discharge currents, while the second region with larger opening degree actively suppresses ozone generation. This allows the system to operate at lower discharge currents without sacrificing dust collection efficiency.
Solution Approach 2:
The second counter electrode portion with larger opening degree acts as an intermediary mechanism that facilitates ion discharge and neutralization. By providing a pathway for ions to escape and recombine, it mediates between the charging process and ozone suppression, enabling the system to maintain dust collection efficiency at lower discharge currents where ozone generation would otherwise be problematic.
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
This configuration 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
When a discharge current flowing between the high voltage electrode and the counter electrode becomes large to obtain the high dust collection efficiency, ozone (O3) may be easily generated according to the discharge
Implementation Method 3
the precipitator includes a charger charging suspended particles by discharging, and a dust collector collecting charged suspended particles
Data Source
Figure 1
Figure 2a~2b
Figure 2c
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.