Electric Deionization Control for Demand-Responsive Ultrapure Water
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Solution Overview
Problem
Conventional ultrapure water producing apparatuses face inefficiencies in energy usage and water quality deterioration due to excessive water processing in the electric deionization device, making it difficult to adjust production according to usage demands.
Innovation Solution
A control method that adjusts the amount of water supplied to the electric deionization device based on the water level in a storage tank, using a water level measuring means, and controls the operating current to maintain a constant water level and quality, employing a specific configuration of the electric deionization device to minimize ion back-diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an excess amount of primary pure water is produced and circulated to ensure stable water quality supply, then water quality stability is improved, but energy efficiency deteriorates due to excessive processing in the electric deionization device
Solution Approach 1:
The patent implements dynamic control of the electric deionization device operating current based on real-time water level detection in the storage tank. The control unit adjusts the current continuously to maintain optimal water level, transitioning from static excess production to dynamic demand-responsive operation, thereby reducing energy waste while ensuring water quality stability.
Solution Approach 2:
The patent introduces a feedback control mechanism where the water level measuring means continuously monitors the storage tank water level and provides signals to the control unit. The control unit adjusts the electric deionization device operating current based on this feedback, creating a closed-loop system that optimizes energy efficiency while maintaining reliable water quality supply.
2Loss of energy
If the processing amount in the electric deionization device is changed to match usage demand, then energy efficiency is improved, but water quality deteriorates due to difficulty in following usage changes
Solution Approach 1:
The feedback control mechanism enables the system to respond dynamically to usage changes. The water level measuring means detects real-time water level changes caused by usage variations, and the control unit adjusts the operating current accordingly, allowing the system to follow usage changes while maintaining water quality stability through continuous feedback regulation.
Solution Approach 2:
The patent changes the operating parameter (electric current) of the electric deionization device dynamically based on water level conditions. By adjusting the current parameter in response to water level changes, the system optimizes processing amount to match usage demand while maintaining water quality through controlled parameter variation rather than fixed operation.
3Loss of energy
If the processing amount in the electric deionization device is changed to match usage demand, then energy efficiency is improved, but the system complexity increases due to difficulty in following usage changes
Solution Approach 1:
The feedback control mechanism simplifies the system's ability to follow usage changes by using automatic real-time detection and adjustment. The water level measuring means and control unit work together to automatically respond to usage variations without complex manual intervention, reducing operational complexity while achieving energy efficiency through automated parameter adjustment.
Solution Approach 2:
The system performs self-regulation through automatic water level detection and autonomous current adjustment. The control unit autonomously modifies the electric deionization device operating current based on water level feedback, eliminating the need for external complex control systems or manual intervention, thereby achieving energy efficiency while keeping system complexity manageable through self-service 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
This method enhances the efficiency of the primary pure water system by optimizing power usage and maintaining consistent water quality, allowing for precise adjustment of production based on demand.
Implementation Method 1
an electric deionization device 9... removes most of the electrolytes... in the preprocessed water W1
Implementation Method 2
a reverse osmosis membrane device 5 that processes preprocessed water W1
Implementation Method 3
an ultrafiltration (UF) membrane 14... removes fine particles to obtain ultrapure water W3
Implementation Method 4
a ultraviolet oxidizing device 7... decomposes organic substances
Data Source
AI summary
In a primary pure water device, an electric deionization device communicated with a water supply pump is provided with a DC power supply, and desalted water from the electric deionization device can be supplied to a sub-tank. The sub-tank is provided with a level switch. In addition, while a control valve and a flow meter are provided in a flow path for the desalted water from the electric deionization device, a control valve and a flow meter are also provided in a flow path for concentrated water from the electric deionization device. The measurement data of the level switch and the flow meters can be transmitted to a control device, which can control the water supply pump and the control valves.