Gold-Plated Capillary Surface for Aerosolized Mercury Separation
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Solution Overview
Problem
Current technologies are ineffective in capturing and removing elemental mercury in its aerosolized form from gaseous streams due to its high surface tension and lack of affinity for typical materials, leading to environmental pollution and infrastructure damage.
Innovation Solution
A metallic capillary surface, preferably made of braided copper wire with a gold plating, is used to contact the gaseous stream, allowing aerosolized mercury droplets to coalesce and accumulate, leveraging capillary action and gravity for collection, while the gold's affinity for mercury prevents re-aerosolization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coalescers are used to capture aerosolized mercury, then mercury removal is attempted, but effectiveness is low due to high surface tension and lack of affinity for mercury
Solution Approach 1:
The patent introduces a hydrophobic coating on the coalescer media as an intermediary substance that specifically interacts with mercury droplets. This coating reduces the surface tension barrier and provides affinity for mercury, enabling effective capture without requiring the bulk coalescer material to have direct affinity for mercury.
Solution Approach 2:
The patent modifies the surface properties of the coalescer media by applying a hydrophobic coating, which changes the surface energy parameters. This parameter change enables the media to interact effectively with mercury droplets despite mercury's inherently high surface tension, allowing droplets to coalesce and be captured.
2Reliability
If brominated adsorbents are used to remove mercury, then some mercury capture is achieved, but large amounts of mercury-polluted material are generated requiring land-fill
Solution Approach 1:
The patent extracts only the essential function of mercury capture from the adsorbent material by using a hydrophobic coating on reusable coalescer media. This allows mercury to be captured and coalesced without consuming the entire adsorbent material, enabling the media to be regenerated and reused, thus eliminating the need to dispose of large amounts of polluted adsorbent.
Solution Approach 2:
The patent enables recovery and reuse of the coalescer media after mercury capture. Instead of discarding saturated adsorbent material, the hydrophobic coating allows for mercury removal and media regeneration, creating a sustainable process that recovers both the mercury and the filtering media for continued use.
3Reliability
If photochemical oxidation is used to convert elemental mercury to oxidized form, then mercury can be collected in existing devices, but the process is complex and requires additional equipment
Solution Approach 1:
The patent makes existing coalescer devices multi-functional by adding a hydrophobic coating that enables them to capture aerosolized mercury directly without requiring separate photochemical oxidation equipment. This universal approach allows a single device to perform both the capture and concentration functions, eliminating the need for additional UV lamps, reactors, and control systems.
4Device complexity
If typical coalescer materials are used, then device simplicity is maintained, but affinity for mercury is insufficient due to lack of hydrophobicity
Solution Approach 1:
The patent applies local quality modification by coating only the surface of the coalescer media with hydrophobic material. This maintains the bulk simplicity and structural integrity of the original coalescer while locally enhancing the surface properties to provide specific affinity for mercury droplets, achieving both simplicity and effectiveness.
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 method achieves high removal efficiency of aerosolized mercury at low differential pressures, preventing environmental release and infrastructure damage by effectively capturing and collecting mercury in its pure form.
Implementation Method 1
aerosolized droplets to deposit on the capillary surface and by capillary action to coalesce with other of such droplets to form increasingly large drops of mercury
Implementation Method 2
The surface is oriented to allow the mercury drops to flow by gravitational forces and capillary action to the lowermost portions of the surface or an extension of same where they accumulate
Implementation Method 3
the gold's affinity for mercury prevents re-aerosolization
Data Source
AI summary
A method and apparatus for practicing the method are provided for separating droplets of finely aerosolized elemental mercury from a gaseous stream in which the droplets are dispersed. In the method a gold plated metallic capillary surface is contacted with the gaseous stream, causing the aerosolized droplets to deposit on the capillary surface and by capillary action to coalesce with other of such droplets to form increasingly large drops of mercury. The surface is oriented to allow the mercury to flow by gravitational forces and capillary action to the lowermost portions of the surface, at which it accumulates, and is then collected at a suitable vessel.