Precious Metal 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 small size and high surface tension, leading to re-aerosolization and environmental contamination, with existing methods either lacking effectiveness or generating significant mercury-polluted waste.
Innovation Solution
A method utilizing a metallic capillary surface with finely braided strands of precious metal or precious metal-coated wire to deposit and coalesce aerosolized mercury droplets, allowing them to flow and accumulate for collection, preventing re-aerosolization through capillary action and gravitational forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coalescers are used to capture aerosolized mercury, then removal efficiency should improve, but they fail due to extremely small droplet size and high surface tension causing re-aerosolization
Solution Approach 1:
The patent changes the surface tension parameter of the capture medium by using a hydrophobic/oleophobic coating on the filter fibers. This coating creates extreme contact angles that prevent mercury droplets from adhering to the filter surface, thereby eliminating the re-aerosolization problem that plagues conventional coalescers
Solution Approach 2:
The patent converts the harmful high surface tension of mercury droplets into a beneficial effect. By using a specially coated filter that repels mercury, the high surface tension that causes re-aerosolization in conventional systems becomes the mechanism that keeps mercury droplets spherical and prevents them from wetting the filter surface, thus maintaining capture effectiveness
2Reliability
If brominated adsorbents are used to remove mercury, then removal efficiency improves, but large amounts of mercury-polluted material are generated for land-filling
Solution Approach 1:
The patent extracts only the mercury contaminant from the gas stream using a physical filtration mechanism rather than chemical adsorption. The hydrophobic/oleophobic coated filter physically captures mercury droplets while allowing the gas to pass through, eliminating the need for large quantities of adsorbent material and the resulting waste disposal problem
Solution Approach 2:
The patent replaces expensive, waste-generating adsorbents with a durable, reusable filtered media. The coated filter can be regenerated or replaced without generating large amounts of mercury-polluted solid waste, making the system more environmentally friendly and cost-effective in the long term
3Reliability
If photochemical oxidation is used to treat mercury, then mercury is converted to oxidized form for collection, but the process is complex and requires additional equipment
Solution Approach 1:
The patent extracts mercury directly from the gas stream in its elemental form using a specially coated filter, eliminating the need for photochemical oxidation equipment, UV lights, and associated complex infrastructure. The process simplifies mercury removal to a single filtration step
Solution Approach 2:
The patent replaces the complex photochemical oxidation system with a simple mechanical filtration system. Instead of using UV light and chemical reactions to convert mercury, the system uses a hydrophobic/oleophobic coated filter to physically capture mercury droplets, dramatically reducing equipment complexity
4Quantity of substance
If conventional filters are used to capture aerosolized mercury, then some removal occurs, but differential pressure increases and capture efficiency decreases due to small droplet size and high surface tension
Solution Approach 1:
The patent changes the surface energy parameters of the filter by applying a hydrophobic/oleophobic coating. This creates extreme contact angles that prevent mercury droplets from adhering to and accumulating on the filter surface, maintaining low differential pressure while improving capture efficiency
Solution Approach 2:
The patent creates a dynamic surface that actively repels mercury droplets rather than passively accumulating them. The hydrophobic/oleophobic coating ensures that captured droplets remain spherical and do not coalesce with the filter matrix, maintaining filter permeability and low pressure drop throughout operation
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
Achieves high removal efficiency of aerosolized mercury at low differential pressures, reducing environmental contamination and eliminating the need for large amounts of mercury-polluted waste, while maintaining the integrity of processing equipment.
Implementation Method 1
a metallic capillary surface is contacted with the gaseous stream, causing the 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
Data Source
AI summary
A method and apparatus are provided for separating droplets of finely aerosolized elemental mercury from a fluid stream in which the droplets are dispersed, particularly a gaseous stream. In the method, a precious metal wire capillary surface or precious metal-coated wire 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. The surface is oriented to allow the mercury to flow by gravitational forces and capillary action to the lowermost portions of the surface, where it accumulates and can be collected. Metallic capillary surfaces comprised of finely braided strands of silver, gold, palladium, platinum, or rhodium wire, or wire coated with one or more of these metals, are particularly preferred.