Radial Counterflow Desalination via Electromagnetic Induction
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Solution Overview
Problem
Reverse osmosis desalination methods face challenges such as high energy requirements, membrane fouling, voluminous and polluting reject brine streams, and environmental concerns due to the disposal of concentrated industrial waste, particularly in treating brackish and seawater, which are costly and environmentally detrimental.
Innovation Solution
A centrifugal pump system with radial counterflow and an axial pump, combined with an inductor using electromagnetic forces, creates turbulent vortices that separate fresh water from brine, concentrating salts and reducing the volume of waste brine through continuous crystallization and axial extraction, eliminating the need for pretreatment and minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse osmosis is used for desalination, then water can be separated from brine, but high energy consumption and membrane fouling occur
Solution Approach 1:
The patent replaces the mechanical pressure-based reverse osmosis system with an electromagnetic field-based separation system. The inductor generates electromagnetic fields that interact with ions in the brine, causing them to migrate toward electrodes through electrophoresis, while water molecules pass through the magnetic field unaffected, achieving separation without high mechanical pressure
Solution Approach 2:
The patent changes the separation mechanism from pressure-driven physical filtration to electromagnetic field-driven ionic migration. By applying alternating electromagnetic fields at specific frequencies, the system selectively affects ionic movement while leaving water molecules relatively unaffected, fundamentally changing the separation parameters from mechanical to electromagnetic
2Reliability
If reverse osmosis is used for desalination, then fresh water is produced, but voluminous reject brine stream is generated causing environmental pollution
Solution Approach 1:
The patent recovers valuable metals and minerals from the brine stream by using electromagnetic fields to concentrate and precipitate ionic substances. The system captures metal ions, calcium, magnesium, and other minerals that would otherwise be discarded, transforming waste brine into recoverable resources while reducing the volume of harmful waste
Solution Approach 2:
The patent converts the harmful high-salinity reject brine into a beneficial resource stream. The electromagnetic separation process concentrates valuable minerals and metals from the brine, which can then be recovered and utilized, while the remaining water volume is significantly reduced, turning an environmental liability into an economic and environmental asset
3Reliability
If reverse osmosis membranes are used, then water separation is achieved, but extensive pretreatment is required upstream
Solution Approach 1:
The patent extracts and removes the vulnerable membrane component from the system entirely. By using electromagnetic fields for separation, the system eliminates the need for physical membranes that require protection from fouling, thereby removing the entire pretreatment infrastructure that would otherwise be necessary to protect membrane integrity
4Reliability
If high pressure is applied in reverse osmosis, then osmotic pressure is overcome, but energy consumption increases significantly
Solution Approach 1:
The patent substitutes mechanical pressure application with electromagnetic field application. Instead of using high-pressure pumps to force water through membranes, the system uses inductors to generate alternating electromagnetic fields that selectively mobilize ions through electrophoresis, achieving separation through electromagnetic rather than mechanical means
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 effectively reduces the salinity of water, concentrates brine for crystallization, and recovers metals, achieving efficient desalination and metal recovery with minimal environmental impact by utilizing turbulence and electromagnetic forces to separate and concentrate salts, reducing the volume of waste brine and energy consumption.
Implementation Method 1
An inductor causes wall-normal force advecting brine away from the casing and into a boundary layer against the baffle
Implementation Method 2
The inductor causes wall-normal force advecting brine away from the casing
Implementation Method 3
The centrifugal pump advects brine radially outward
Implementation Method 4
creates turbulent vortices that separate fresh water from brine
Implementation Method 5
Turbulent vortices form shells of concentrated brine at their peripheries because solids are denser than water and are therefore centrifugally separated from water in the turbulent vortices
Implementation Method 6
an axial pump advects fresh water radially inward to axial extraction
Implementation Method 7
concentrates brine for crystallization, achieving efficient desalination and metal recovery
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
Simultaneous source-sink flow, or radial counterflow, is driven by a centrifugal pump disposed within a casing. Radially outward source flow of brine goes into a shrouding tank and concentrates while a radially inward sink flow of fresh water flows back over the pump to axial extraction. An axial pump drives sink flow and axial extraction. Convergent sink flow passes under an inductor to an axial exhaust port. Induced viscosity and inductive repulsion hinder the passage of brine in sink flow, so only fresh water can reach the axial exhaust port. Crystallization of scale-forming salts is aided by Joule heating from the inductor. Solvent and gases are continuously axially extracted in sink flow, favoring crystallization. Sodium chloride is cooled and crystallized in the shrouding tank. Brine comprising other salts flows out of the tank to treatment by suitable means. Thus brine is separated into fresh water, crystallized salt, and concentrated brine. Oil also is separated from brine. Metal recovery is another application, using the teacup effect, inductive repulsion, and grooved runners on the centrifugal pump to separate metals from light solids and water. Tiny centrifugal separation effects of innumerable turbulent eddy vortices are integrated by the forcing regime of the centrifugal pump and the axial pump. A coherent network of organized low pressure gradients along capillary and arterial vortices gives bulk porosity so that sink flow can go through source flow. In an embodiment comprising counter-rotating impellers in the centrifugal pump, radial vortices provide arterial conduits for sink flow of fresh water and gases to axial extraction.