Electrostatic Particle Collector with Bent Flow for Uniform Sampling
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Solution Overview
Problem
Conventional electrostatic precipitators (ESP) suffer from low collection efficiency, non-uniform spatial distribution of particles, high size dependency in deposition, and high chemical interference due to reactive gas generation, which hinders accurate sampling and analysis of airborne particles.
Innovation Solution
An ESP particle collector with a sheath flow inlet section, a collector section, and an optical measuring instrument that transmits light through the collector plate, featuring a bent flow tube design and controlled electric field to ensure high spatial uniformity, low size dependence, and low chemical interference, along with a cleaning system and purge gas mechanism for efficient particle collection and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESP systems are used for particle collection, then particles can be collected from gas streams, but the collection efficiency is low and spatial uniformity in deposition pattern is poor
Solution Approach 1:
The inlet is divided into multiple segments (first inlet, second inlet, third inlet, fourth inlet) arranged around the central axis, with each inlet equipped with its own electrode. This segmentation allows particles to be collected uniformly from different directions and positions, improving both collection efficiency and spatial uniformity of deposition pattern simultaneously
Solution Approach 2:
The invention transitions from conventional single-direction or two-direction inlet designs to a four-directional inlet configuration arranged around a central axis. This dimensional expansion enables particles to be collected from multiple spatial directions simultaneously, achieving uniform deposition pattern while maintaining high collection efficiency
2Reliability
If conventional ESP systems are used, then particles can be collected, but there is high size dependency in deposition pattern such that particles in different sizes are not uniformly distributed
Solution Approach 1:
The inlet is divided into multiple segments (first inlet, second inlet, third inlet, fourth inlet) arranged around the central axis, with each inlet equipped with its own electrode. This segmentation allows particles to be collected uniformly from different directions and positions, improving both collection efficiency and spatial uniformity of deposition pattern simultaneously
Solution Approach 2:
The invention transitions from conventional single-direction or two-direction inlet designs to a four-directional inlet configuration arranged around a central axis. This dimensional expansion enables particles to be collected from multiple spatial directions simultaneously, achieving uniform deposition pattern while maintaining high collection efficiency
3Productivity
If high electric field strength is used in ESP electrodes, then particle collection can occur, but reactive molecules such as ozone, NOx and others are produced from corona discharge
Solution Approach 1:
The invention changes the operating parameters by using multiple electrodes distributed around the central axis, each operating at lower voltage. This distributes the collection function across multiple lower-field electrodes rather than relying on a single high-field electrode, thereby achieving effective particle collection while minimizing corona discharge and reactive gas production
4Measurement precision
If rapid particle sampling is required for high accuracy, then collection duration should be short, but high collection efficiency is needed which typically requires longer exposure time
Solution Approach 1:
The inlet is divided into multiple segments (first inlet, second inlet, third inlet, fourth inlet) arranged around the central axis, with each inlet equipped with its own electrode. This segmentation allows particles to be collected uniformly from different directions and positions, improving both collection efficiency and spatial uniformity of deposition pattern simultaneously
Solution Approach 2:
The invention transitions from conventional single-direction or two-direction inlet designs to a four-directional inlet configuration arranged around a central axis. This dimensional expansion enables particles to be collected from multiple spatial directions simultaneously, achieving uniform deposition pattern while maintaining high collection efficiency
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, rapid particle accumulation, and minimal chemical interference, enabling accurate optical analysis of collected particles with improved spatial uniformity and reduced size dependency.
Implementation Method 1
an electrostatic particle collector for collecting particles in a particle containing gas stream
Implementation Method 2
an optical measuring instrument (9) configured to transmit light through the collector plate along a centre axis A orthogonal or substantially orthogonal to the particle collection surface for optical analysis
Data Source
AI summary
ESP particle collector (1) for collecting particles in a particle containing gas stream, comprising an inlet section (4), a collector section (6), and an electrode arrangement (8), the inlet section comprising a flow tube (10) defining a gas flow channel (12) therein bounded by a guide wall (24) extending between an entry end (14) and a collector end (16) that serves as an inlet to the collector section (6), the entry end comprising an inlet (28) for the particle gas stream and a sheath flow inlet portion (26) for generating a sheath flow around the particle gas stream, the collector section comprising a housing (18) coupled to the flow tube, and a collector plate (20) mounted therein having a particle collection surface (23). The ESP particle collector comprises an optical measuring instrument (9) configured to transmit light through the collector plate along a centre axis (A) orthogonal or substantially orthogonal to the particle collection surface for optical analysis of the collector plate particle collection surface to measure particles collected thereon, and wherein the flow tube has a bent portion (15) such that the entry end (14) is positioned out of the centre axis A to allow the light to be transmitted through the collector plate in the direction of the centre axis and to be picked up without interfering with the gas flow or the gas inlet.