Capacitive Deionization Current Control for Ion Removal
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Solution Overview
Problem
Capacitive deionization systems face inefficiencies in ion removal and regeneration due to electrode saturation, as existing methods rely on voltage regulation rather than current control, leading to suboptimal ion transfer and capacity utilization.
Innovation Solution
Implementing a current-regulated operation method that integrates amperage over time to monitor and control ion transfer, allowing for precise determination of electrode saturation and regeneration, thereby optimizing ion removal and system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage regulation is used to control ion removal, then the system operation is simple, but ion transfer precision and capacity utilization are suboptimal
Solution Approach 1:
The patent implements a feedback control system where the power supply continuously monitors the electrical charge accumulated on the electrodes and adjusts the voltage accordingly. This feedback mechanism enables precise control of ion transfer by integrating current over time to track electrode saturation, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent replaces traditional mechanical voltage regulation systems with an electrical feedback control system that uses current integration and electronic sensing. This substitution enables more precise control of ion transfer through electrical measurements rather than mechanical adjustments, improving measurement precision while maintaining manageable system complexity.
2Productivity
If electrodes are operated until saturation, then ion removal capacity is maximized, but regeneration efficiency decreases
Solution Approach 1:
The feedback control system monitors the electrical charge on electrodes in real-time and provides precise information about saturation levels. This enables optimization of the operational cycle by determining the exact point at which electrodes should be regenerated, maximizing ion removal capacity while minimizing unnecessary regeneration operations and associated energy losses.
Solution Approach 2:
The patent dynamically adjusts operating parameters including voltage, current, and flow rate based on real-time electrode charge measurements. By changing these parameters optimally throughout the operational cycle, the system maximizes ion removal capacity while extending the time between regenerations, thereby reducing regeneration frequency and energy loss.
3Productivity
If voltage potential is continuously applied, then ion removal is continuous, but energy consumption increases unnecessarily
Solution Approach 1:
The patent implements periodic operation cycles consisting of treatment phases where voltage is applied for ion removal, followed by regeneration phases where voltage is reduced or reversed. This periodic action maintains continuous ion removal capability across multiple cycles while avoiding unnecessary energy consumption during regeneration periods, resolving the contradiction between productivity and energy use.
Solution Approach 2:
The system uses the measured electrical charge information to automatically determine when regeneration is needed, eliminating the need for continuous voltage application. The feedback control enables the system to serve itself by optimizing its own operation based on real-time measurements, maintaining ion removal continuity while minimizing energy consumption through intelligent voltage management.
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 approach enhances the capacitive deionization process by accurately measuring ion collection and discharge, preventing unnecessary voltage application and improving system efficiency, leading to more effective ion removal and extended capacitor life.
Implementation Method 1
a voltage potential is established between the electrodes. This voltage potential causes constituents in the water to be attracted to and at least temporarily retained on one of the electrodes
Implementation Method 2
the flow-through capacitor may be set to discharge the captured constituents. Typically, this discharge occurs by removing the voltage potential or by temporarily applying a voltage potential in an opposite direction
Data Source
AI summary
Embodiments of the invention provide methods of removing ions from a feed water stream using a flow-through capacitor and a controller for performing the methods. A target value for a water property concentration or a fixed percent removal of a water property concentration to be removed is established for a treated water stream exiting the flow-through capacitor. A feed value for the water property concentration is measured in a feed water stream entering the flow-through capacitor. An amperage of the flow-through capacitor and a flow rate through the flow-through capacitor is controlled to remove ions from the feed water stream to achieve the desired removal of the water property.