Particle Capture Device Segmentation and Recirculation
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Solution Overview
Problem
Conventional wet scrubbers are ineffective in capturing particles with diameters less than 2 μm, leading to accumulation and jamming issues, poor defogging performance, and emission of particulate matter, resulting in severe air pollution.
Innovation Solution
A device comprising a gas-guiding unit, a mist-elimination unit, and a liquid-circulation unit, where the gas-guiding unit has a channel with a gap allowing liquid from the liquid-circulation unit to mix with gas, forming larger droplets that are captured by the mist-elimination unit, and the liquid is recirculated to prevent particle accumulation and enhance capture efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fiber demister is used to capture droplets/particles with diameter about 1 μm, then the capture efficiency is improved, but the occupation space increases and the superficial velocity must be limited to below 0.5 m/s
Solution Approach 1:
The device segments the particle capture process into two stages: first, a pre-demisting section captures larger droplets/particles (≥10 μm) using a vane/chevron demister; second, a main demisting section captures finer droplets/particles (≥1 μm) using a fiber demister. This segmentation allows each section to be optimized for its specific size range, reducing the overall space requirement while maintaining high capture efficiency across all particle sizes.
Solution Approach 2:
The device introduces a vertical dimension by stacking demisting sections at different heights. The pre-demisting section is positioned above the main demisting section, creating a multi-level structure that processes particles of different sizes at different vertical levels. This dimensional arrangement increases processing capacity without proportionally increasing horizontal footprint.
2Area of stationary object
If a mesh or vane/chevron demister is used to reduce occupation space and increase superficial velocity, then the occupation space is reduced, but the ability to capture droplets/particles with diameter less than 10 μm is insufficient
Solution Approach 1:
The device segments the particle capture process into two stages: first, a pre-demisting section captures larger droplets/particles (≥10 μm) using a vane/chevron demister; second, a main demisting section captures finer droplets/particles (≥1 μm) using a fiber demister. This segmentation allows each section to be optimized for its specific size range, reducing the overall space requirement while maintaining high capture efficiency across all particle sizes.
Solution Approach 2:
The pre-demisting section performs preliminary capture of larger droplets/particles before the gas stream enters the main demisting section. By removing coarse particles first, the main fiber demister can focus its capacity on capturing finer particles, improving overall system efficiency and reducing the space needed for fine particle capture.
3Quantity of substance
If conventional wet scrubbers are used to handle low-concentrated inorganic exhaust gas, then the handling capacity is limited, but particles with diameter less than 2 μm cannot be effectively captured
Solution Approach 1:
The device segments the particle capture process into two stages: first, a pre-demisting section captures larger droplets/particles (≥10 μm) using a vane/chevron demister; second, a main demisting section captures finer droplets/particles (≥1 μm) using a fiber demister. This segmentation allows each section to be optimized for its specific size range, reducing the overall space requirement while maintaining high capture efficiency across all particle sizes.
Solution Approach 2:
The device changes the operational parameters of the demisting sections to optimize performance. The pre-demisting section operates at higher superficial velocities suitable for coarse particle capture, while the main demisting section operates at lower velocities optimized for fine particle capture. This parameter optimization enables effective handling of low-concentrated exhaust gas with high efficiency across all particle sizes.
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 device effectively captures particles with diameters greater than 2 μm, reducing air pollution by preventing accumulation and jamming, while occupying less space and maintaining efficient defogging performance.
Implementation Method 1
the liquid in the liquid-circulation unit is inhaled into the channel of the gas-guiding unit via the gap to have the particles in the gas to be contained into the liquid so as to form droplets to be captured
Implementation Method 2
After the droplets to be captured are captured by the mist-elimination unit
Implementation Method 3
the liquid formed at the mist-elimination unit by capturing the droplets to be captured flows down into the liquid-circulation unit
Data Source
AI summary
A device for capturing particles includes a gas-guiding unit, a gas-guiding unit and a mist-elimination unit. The gas-guiding unit has opposing first and second ends. The mist-elimination unit is disposed at the second end. The liquid-circulation unit, disposed under the mist-elimination unit by surrounding the gas-guiding unit, includes through holes below the gas-guiding unit by a gap. A gas containing particles enters the channel via the first end and then the mist-elimination unit via the second end. While the gas flows into the channel, the liquid in the liquid-circulation unit is inhaled into the channel via the gap to form droplets containing particles. After the droplets are captured by the mist-elimination unit, the liquid formed at the mist-elimination unit flows down into the liquid-circulation unit to reform the liquid to be further inhaled back to the channel of the gas-guiding unit via the gap.