Semi-dry Electrostatic Cyclone Sampler for Gas and Particulate Separation
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Solution Overview
Problem
Existing samplers fail to accurately sample gas and solid suspensions individually, which is essential for evaluating air pollution risks as they may contain harmful contaminants that endanger human health and the environment.
Innovation Solution
A semi-dry type electrostatic cyclone sampler comprising a cyclone body, an insulate element, discharge electrode, air tube, air introducing means, discharging means, and flushing means, which allows for the separation and collection of particulates from air streams through electrostatic charging and subsequent flushing with water to form a particulate-containing water sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional samplers are used to collect air samples, then gas samples can be obtained, but solid suspensions (particulates) cannot be separated and sampled individually
Solution Approach 1:
The sampler is divided into distinct functional modules: a cyclone separation module for particulate collection, a gas sampling module for gas-phase contaminants, and a flushing module for particulate removal. This segmentation allows independent sampling of solid suspensions and gas phases, resolving the contradiction by enabling both specific particulate measurement and versatile sampling capability.
Solution Approach 2:
The sampler integrates multiple functions into a single device: it can simultaneously collect particulates on the cyclone wall, capture gas samples through the air tube, and flush particulates into receiving fluid. This multi-functionality allows the device to adapt to different sampling needs (gas-only, particulate-only, or combined), improving both measurement precision and versatility.
2Productivity
If electrostatic charging is applied to collect particulates, then collection efficiency improves, but device complexity increases due to additional electrodes and power requirements
Solution Approach 1:
The electrostatic charging function is merged with the cyclone separation structure by placing discharge electrodes directly within the cyclone chamber. The electrodes utilize the existing cyclone wall and airflow path, combining particulate collection and gas flow functions in a single integrated structure, thereby improving collection efficiency without proportionally increasing device complexity.
Solution Approach 2:
The discharge electrodes are designed to automatically charge particulates as they pass through the electric field during normal cyclone operation. The system uses its own airflow to transport charged particulates to the collection wall, eliminating the need for separate mechanical collection mechanisms and reducing overall structural complexity while maintaining high collection efficiency.
3Adaptability or versatility
If water is introduced to flush the cyclone chamber for particulate collection, then particulate sampling capability is achieved, but gas sampling capability is compromised
Solution Approach 1:
The sampler operates in periodic cycles: during the gas sampling phase, the cyclone chamber remains dry and gas samples are collected through the air tube; during the particulate sampling phase, water is introduced to flush particulates into the receiving fluid. This periodic operation ensures that gas sampling reliability is maintained when needed, while particulate sampling capability is activated when required, resolving the contradiction through time-separated functions.
Solution Approach 2:
Before gas sampling, the system performs a preliminary flushing operation to remove any residual particulates from the previous cycle. This preliminary action ensures that the cyclone chamber is clean and dry, preventing particulate contamination of subsequent gas samples and maintaining gas sampling reliability while preserving the ability to perform particulate sampling in dedicated cycles.
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
Enables accurate individual sampling of gas and water samples by effectively collecting and analyzing particulates using electrostatic charging and flushing mechanisms, improving the accuracy of air pollution assessments.
Implementation Method 1
The discharging means is for applying a high voltage power to the discharge electrode to electrically charge at least a part of the particulates in a way that the charged particulates can attach on the annular wall
Implementation Method 2
the air stream spirally flows along the annular wall and is expelled from the cyclone chamber via the passage
Data Source
AI summary
A semi-dry type electrostatic cyclone sampler includes a cyclone body, an insulate element, a discharge electrode, an air tube, an air introducing means, a discharging means and a flushing means. The insulate element is disposed at a top of the cyclone body and co-defines a cyclone chamber with the cyclone body. The discharging electrode is disposed on the insulate element. The air tube is disposed at a bottom of the cyclone body. The air introducing means is for introducing a particulate-containing air stream into the cyclone chamber. The discharging means is for charging the particulates so that the particulates can attach to an inside of the cyclone body. The flushing means is for flushing the inside of the cyclone body and collecting part of the particulates. When the discharging means activates, the air introducing means activates simultaneously. When the flushing means activates, the discharging means is deactivated.