Electrostatic Precipitator with Perforated Plate Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrostatic precipitators face challenges with particle re-entrainment due to agglomeration and airflow forces, leading to reduced filtration efficiency and increased frequency of cleaning or replacement, especially in dusty environments.
Innovation Solution
The electrostatic precipitator incorporates a housing with corona electrodes and collector electrodes covered by a perforated, non-conductive plate, which creates a quiet zone for particle collection, reducing airflow impact and enhancing particle retention through increased surface area and reduced re-entrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic precipitators use smooth metal electrode plates, then particle collection occurs through electrostatic attraction, but particle re-entrainment increases due to agglomeration and airflow forces
Solution Approach 1:
The patent applies porous foam material to cover the collector electrodes, creating a porous structure that captures particles within its cellular matrix. This porous configuration prevents particle re-entrainment by physically trapping particles within the foam's three-dimensional network, while still allowing airflow to pass through and maintain collection efficiency.
Solution Approach 2:
The patent combines conductive foam material with non-conductive perforated plate coverings to create a composite electrode structure. The conductive foam provides electrostatic collection capability, while the non-conductive perforated plates reduce airflow impact and prevent particle re-entrainment, creating a composite solution that addresses both collection efficiency and particle retention.
2Quantity of substance
If collector electrodes accumulate particle layers, then collection capacity increases, but cleaning frequency increases due to reduced electrostatic attraction
Solution Approach 1:
The porous foam structure provides a three-dimensional matrix that distributes particles throughout its cellular structure rather than allowing them to accumulate on a flat surface. This increases the effective collection capacity while maintaining electrostatic attraction, as particles are distributed within the foam's internal structure rather than forming dense surface layers that would shield subsequent particles.
Solution Approach 2:
The patent transitions from two-dimensional flat electrode surfaces to three-dimensional foam structures with internal porosity. This dimensional change provides additional volume for particle accommodation within the foam's cellular structure, significantly increasing collection capacity without requiring frequent cleaning, as particles are distributed throughout the foam's three-dimensional network.
3Reliability
If fibrous filters are placed perpendicular to airflow, then particle removal efficiency increases, but pressure drop across the filter increases significantly
Solution Approach 1:
The patent replaces the mechanical filtration mechanism of fibrous media with an electrostatic collection mechanism using charged foam electrodes. Instead of relying on particles mechanically contacting and adhering to fibers perpendicular to airflow, the electrostatic field actively attracts charged particles to the foam collector, achieving high removal efficiency while allowing airflow to pass through the foam's porous structure with minimal pressure drop.
Solution Approach 2:
The porous foam structure allows airflow to pass through its cellular matrix with minimal resistance, unlike dense fibrous filters that block airflow. The electrostatic collection occurs within the foam's pores, maintaining high particle removal efficiency while the open-cell structure preserves low pressure drop characteristics.
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 design improves particle capture and retention, extending the intervals between cleaning and replacement, while maintaining low pressure drop across the filter, effectively addressing particle re-entrainment and enhancing filtration efficiency for a wide range of particle sizes.
Implementation Method 1
The corona electrodes produce a corona discharge that ionizes air molecules in an airflow received into the filter.
Implementation Method 2
The ionized air molecules impart a net charge to nearby particles (e.g., dust, dirt, contaminants etc.) in the airflow.
Implementation Method 3
The charged particles are subsequently electrostatically attracted to one of the electrode plates and thereby removed from the airflow as the air moves past the electrode plates.
Data Source
AI summary
An electrostatic precipitator is constructed with collecting and repelling electrodes. The collecting electrode is partially shielded from gas shear forces by a shielding structure. The shielding structure is mounted to reduce gas flow along a surface of the collector and includes passages for charged particles to travel to be captured by the collector.