Direct Contact Electrodes for Desalination Scale Reduction
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Solution Overview
Problem
Existing physical water treatment methods using indirect electrical fields are inefficient in reducing mineral scale formation in desalination systems, particularly due to limited electric field strength and frequency limitations, which are costly and not effective in larger pipes.
Innovation Solution
A desalination method involving direct contact electrodes with alternating voltage to generate an oscillating electric field with sufficient strength and frequency for bulk precipitation of mineral particles, allowing for higher field strengths and frequencies without self-induction limitations, effectively reducing scale formation on heat transfer surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect electrical fields are used in physical water treatment methods, then mineral scale formation is reduced, but the electric field strength is limited and frequency is constrained due to self-induction, making it ineffective in larger pipes
Solution Approach 1:
The patent replaces indirect electromagnetic field methods with direct electrical field methods. Instead of using solenoid coils that generate alternating magnetic fields (which suffer from self-induction limitations), the invention uses direct electrical fields applied through electrodes in contact with the water stream. This substitution of the physical mechanism enables higher field strengths and frequencies without self-induction constraints, effectively resolving the contradiction between scale reduction effectiveness and adaptability to different pipe sizes
Solution Approach 2:
The patent fundamentally changes the electrical parameters by transitioning from indirect alternating magnetic fields to direct electrical fields. This parameter change allows the system to operate at much higher frequencies (up to 100 kHz or more) and field strengths without the self-induction limitations that constrain indirect methods. The direct electrical field approach enables the system to be effective across a wide range of pipe diameters by adjusting voltage and frequency parameters independently of pipe size
2Productivity
If higher electric field strength and frequency are applied, then bulk precipitation of mineral particles is enhanced, but self-induction in indirect field systems limits the achievable field strength and frequency
Solution Approach 1:
The patent substitutes indirect electromagnetic induction with direct electrical field application. By placing electrodes directly in the water stream and applying high-voltage alternating current, the system generates strong electrical fields without the self-induction losses inherent in solenoid coil systems. This substitution enables highly efficient bulk precipitation of mineral particles at frequencies and field strengths that would be energy-prohibitive in indirect systems
Solution Approach 2:
The patent converts the previously harmful effect of self-induction (which caused energy loss and limited field strength) into a benefit by eliminating the inductive coupling entirely. The direct electrical field method uses electrodes that conduct electricity directly through the water, converting electrical energy efficiently into the oscillating electrical field needed for precipitation, without the energy-wasting self-induction phenomenon that plagues indirect methods
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 method significantly reduces mineral scale formation by promoting bulk precipitation of minerals, allowing for efficient removal of seed particles, thereby decreasing the concentration of dissolved ions and preventing scaling on heat transfer surfaces, and can be used in various desalination systems without the constraints of pipe diameter or frequency limitations.
Implementation Method 1
applying an alternating voltage to first and second electrodes in direct contact with the liquid to generate an oscillating electric field across a portion of the liquid
Implementation Method 2
the electric field has a strength and a frequency sufficient to form mineral particles
Data Source
AI summary
The present invention pertains to an effective system and method for reducing or eliminating the formation of scale in desalination systems. The system utilizes at least one pair of electrodes in direct contact with a liquid to induce an oscillating electric field directly in a portion of the liquid or a liquid stream of the desalination system. The electric field is capable of inducing bulk precipitation of ions, minerals, salts, particulates, contaminants or a combination thereof from the liquid stream.