Three-Chamber Electrodeionization for Conductivity Measurement
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Solution Overview
Problem
Current electrodeionization methods face challenges in accurately detecting the penetration of cooling water into process water circuits in power plants due to the interference of additives like ammonia and amines, which complicates conductivity measurements and requires improved methods for ion detection and conductivity analysis.
Innovation Solution
A device and method utilizing a three-chamber setup with permselective membranes and ion exchangers, where the sample liquid flows through an anode and cathode chamber separated by permselective membranes, allowing for precise ion exchange and conductivity measurement before and after treatment, with optional conductivity sensors and degassing units for enhanced analytical capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conductivity measurement is performed on process water containing ammonia and amines additives, then the inherent conductivity increases, but the detection precision of cooling water penetration deteriorates
Solution Approach 1:
The device segments the water treatment process into distinct chambers: a first chamber for initial conductivity measurement, a second chamber containing ion exchange resin for cation removal, and a third chamber for post-treatment conductivity measurement. This segmentation allows separate measurement of inherent conductivity (with additives) and treated conductivity (after cation removal), enabling accurate detection of cooling water penetration despite the presence of ammonia and amines additives.
2Measurement precision
If ion exchange resin is used to remove cations, then the inherent conductivity is reduced, but the measurement of cooling water penetration becomes more accurate
Solution Approach 1:
The device is divided into three functional chambers separated by membranes: the first chamber measures inherent conductivity before ion exchange, the second chamber contains ion exchange resin to remove cations, and the third chamber measures conductivity after treatment. This segmentation into distinct functional units with defined flow paths allows accurate cooling water penetration detection while maintaining manageable device complexity through modular design.
Solution Approach 2:
The ion exchange resin in the second chamber acts as an intermediary substance that selectively removes cations from the process water. This intermediary component transforms the water composition between the first and third measurement chambers, enabling the detection system to distinguish between inherent conductivity (caused by ammonia and amines additives) and conductivity changes due to cooling water penetration.
3Measurement precision
If a three-chamber setup with permselective membranes is used, then ion exchange and conductivity measurement precision are improved, but the device complexity increases
Solution Approach 1:
The electrodeionization device is segmented into three chambers separated by permselective membranes, with each chamber serving a specific function: initial measurement, ion exchange treatment, and post-treatment measurement. This segmentation provides precise conductivity measurements at different stages while using standardized membrane components to manage structural complexity.
Solution Approach 2:
The permselective membranes serve multiple functions: they separate the three chambers structurally, enable selective ion transport during the electrodeionization process, and maintain hydraulic connection between chambers. This multi-functionality reduces the need for additional separate components, managing device complexity while achieving precise conductivity measurement and effective ion exchange.
4Reliability
If ammonia and amines are added to process water for corrosion prevention, then corrosion protection is improved, but the conductivity measurement capability deteriorates
Solution Approach 1:
The device performs preliminary measurement of inherent conductivity in the first chamber before the water enters the ion exchange resin chamber. This preliminary action captures the baseline conductivity contribution from ammonia and amines additives, allowing the system to later compare this baseline with post-treatment measurements to accurately detect cooling water penetration despite the presence of these corrosion-preventive additives.
Solution Approach 2:
The ion exchange resin acts as an intermediary that selectively removes cations including those from ammonia and amines additives. By using this intermediary substance, the system maintains the corrosion protection benefits of these additives in the overall process while enabling accurate conductivity-based detection of cooling water penetration through comparative measurements before and after ion exchange.
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 enables accurate detection of ion changes and pH determination, allowing for effective monitoring of cooling water penetration and maintaining the integrity of conductivity measurements by preventing gas interference and ensuring reliable ion exchange and regeneration of ion exchangers.
Implementation Method 1
a treatment chamber located between the anode chamber and the cathode chamber comprising two openings and ion exchangers
Implementation Method 2
the anode chamber and the cathode chamber are separated from the treatment chamber by a permselective membrane
Implementation Method 3
treatment chamber located between the anode chamber and the cathode chamber comprising two openings and ion exchangers
Implementation Method 4
an energy source is operatively connected to the anode and the cathode
Implementation Method 5
The anode is then connected to the positive pole and the cathode to the negative pole of the DC voltage source
Data Source
AI summary
A device for the electrodeionization of a sample liquid. The device has an anode chamber having two openings and an anode, a cathode chamber having two openings and a cathode, and a treatment chamber, that is arranged between the anode chamber and the cathode chamber and has two openings and ion exchanger. The anode chamber and the cathode chamber are separated from the treatment chamber in each case by a permselective membrane and an energy source is operatively connected to the anode and the cathode. In addition, a method for the electrodeionization of a sample liquid is provided.