Multielectrode Sensor for Molten Salt Concentration and Depth
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Solution Overview
Problem
Current electroanalytical methods for molten salt systems face challenges in accurately determining electrode surface area, leading to uncertainties in concentration measurements due to limitations in existing techniques for assessing electrode area in high radiation and high temperature environments.
Innovation Solution
A multielectrode sensor with an array of electrodes of varying lengths, inserted into a plug with equidistant openings, allowing for in-situ real-time concentration and depth measurements by applying voltage waveforms and measuring current, using a potentiostat to determine concentration and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single electrode is used for concentration measurements, then the measurement process is simple, but the measurement speed is slow and frequent cleaning is required
Solution Approach 1:
The sensor is divided into multiple electrodes (at least three) with different immersion depths, allowing simultaneous measurements at different depths. This segmentation enables faster data collection without requiring frequent cleaning of a single electrode, as multiple electrodes can be cleaned in parallel or rotated.
Solution Approach 2:
The invention adds the depth dimension by varying electrode immersion depths, transforming a single-point measurement into a multi-depth measurement system. This allows concentration profiles to be measured simultaneously at multiple depths, dramatically increasing productivity without proportionally increasing complexity.
2Measurement precision
If electrode surface area is not accurately determined, then the sensor structure remains simple, but concentration measurements become unreliable
Solution Approach 1:
Each electrode is assigned a specific immersion depth and corresponding surface area, creating local quality variations. The known different surface areas of electrodes with different immersion depths allow for accurate concentration calculations without requiring complex real-time area determination methods.
Solution Approach 2:
The surface areas of electrodes are predetermined and known before measurement based on their different lengths and immersion depths. This preliminary determination of electrode areas eliminates the need for complex real-time area measurement techniques, maintaining simple device structure while ensuring measurement precision.
3Reliability
If barrier coatings are applied to electrodes, then electrode area can be controlled, but the coatings are unstable in corrosive molten salt environments
Solution Approach 1:
The electrodes use their own geometric properties (different lengths and immersion depths) to define their effective surface areas, rather than relying on external barrier coatings. This self-service approach eliminates the need for unstable coatings while maintaining reliable area control through the known dimensions of each electrode.
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
Enables faster and more accurate concentration measurements, reducing measurement frequency by over 60% with low statistical uncertainty, and is tolerant of corrosive environments and thermal cycling.
Implementation Method 1
Electroanalytical techniques are based on measurements of the amount of current that flows through an electrode immersed in the molten salt when a specific potential waveform has been applied to that electrode
Data Source
AI summary
A multi electrode sensor that provides in-situ, real time measurements for molten salts and other process fluids such as real-time concentration and salt level measurements for nuclear systems such as molten salt reactors, nuclear reprocessing facilities utilizing molten salts and concentrated solar power systems. The sensor has multiple electrodes with unique lengths which are connected to a potentiostat. Measurements are taken when the electrodes are immersed in the process fluid.