Hybrid Electrostatic-Membrane Filter for Low Pressure Drop
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Solution Overview
Problem
Conventional particulate collection methods face challenges in achieving high collection efficiency while maintaining low pressure drop and regeneration potential, especially in high-temperature processes, due to limitations in filtration mechanisms and thermal constraints.
Innovation Solution
A hybrid apparatus combining an electrostatic precipitator with a porous conductive filter membrane, where high-voltage electrodes create local plasma zones to charge particles, driving them to a grounded surface for collection, and the membrane acts as both a filter and collection plate, allowing for low pressure drop and high filtration velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small pore size filters are used to achieve high collection efficiency for submicron particles, then particle collection efficiency is improved, but pressure drop across the filter increases substantially
Solution Approach 1:
The invention divides the particle collection function into two separate stages: (1) an electrostatic precipitation section that charges and collects larger particles before they reach the filter, and (2) a filtration section with larger pore sizes that handles only the remaining fine particles. This segmentation allows each stage to operate optimally without the other's drawbacks.
Solution Approach 2:
The electrostatic precipitation process performs preliminary particle collection and charging before the gas stream reaches the filter. By removing a significant portion of particles upstream, the filter operates under lighter load conditions, maintaining lower pressure drop while achieving high overall collection efficiency.
2Stress or pressure
If increased pore sizes are used to decrease pressure drop across the filter, then pressure drop is reduced, but particle collection efficiency becomes unacceptable
Solution Approach 1:
The filtration task is segmented into two parts: electrostatic precipitation for initial particle removal and charge generation, followed by filtration through larger pore sizes. This allows the filter to use larger pores (reducing pressure drop) while the electrostatic stage ensures high overall collection efficiency by removing particles that would otherwise require small pores to capture.
Solution Approach 2:
The electrostatic precipitation section acts as an intermediary between the incoming particle-laden gas and the filter. It pre-charges and pre-collects particles, transforming the gas stream into a state where the subsequent filter can operate with larger pores while maintaining effective particle removal.
3Stress or pressure
If conventional electrostatic collectors are used to drive particles to collection surface, then pressure drop is reduced, but collection efficiency is limited by long particle travel distances
Solution Approach 1:
The invention merges the electrostatic precipitation function with the filtration function by integrating a charged electrode system directly with the filter surface. This combination allows particles to be charged and collected in a single integrated unit, eliminating the need for long travel distances to separate collection surfaces while maintaining low pressure drop.
Solution Approach 2:
The filter assembly serves multiple functions simultaneously: (1) it acts as a mechanical filter with larger pores for low pressure drop, (2) it serves as an electrostatic collection surface for charged particles, and (3) it provides a grounded surface for particle deposition. This multi-functionality resolves the contradiction by making the same structure perform both filtration and electrostatic collection roles.
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 achieves high collection efficiency with ultralow pressure drop and superior cleaning ability, operating effectively across a wide temperature range and reducing the need for depth filtration, thus preventing blinding and maintaining performance over time.
Implementation Method 1
the charged particles can be driven to an electrically grounded surface by an electrostatic field generated by the electrode
Implementation Method 2
the charged particles can be driven to an electrically grounded surface by an electrostatic field generated by the electrode
Implementation Method 3
The electrode(s) can have very sharp tips that when supplied with high voltage power, either of positive or negative polarity, can create local plasma zones that induce a charge on particles flowing past the electrode(s)
Data Source
AI summary
Apparatus and methods for collection and removal of particulate matter, including fine particulate matter, from a gas stream, comprising a unique combination of high collection efficiency and ultralow pressure drop across the filter. The apparatus and method utilize simultaneous electrostatic precipitation and membrane filtration of a particular pore size, wherein electrostatic collection and filtration occur on the same surface.