Integrated Electrochemical Reactor Gas Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electrochemical reactors, such as fuel cells and electrolyzers, face challenges in monitoring and controlling their internal operating conditions due to limitations in measuring key parameters like gas composition and temperature, leading to suboptimal performance, safety issues, and inefficiencies.
Innovation Solution
An integrated electrochemical reactor design with a single-piece body containing a chamber for a gas composition sensor that is directly exposed to the reaction conditions, allowing for precise and real-time monitoring of gas concentrations, including hydrogen and oxygen, using a sensor sensitive to thermal conductivity, which is protected from humidity and liquids, enabling accurate and rapid feedback for operational control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas analyzers are used to measure gas composition by taking samples from the reactor, then gas concentration information can be obtained, but the measurement process is intermittent, time-consuming, and results in loss of yield due to discarded samples
Solution Approach 1:
The patent extracts the measurement function from the main reactor system by using a separate sensor device that takes samples through a tap in the reactor wall. This allows continuous monitoring without interrupting the main process, as the sensor operates independently while the reactor continues production.
Solution Approach 2:
The patent introduces an intermediary measurement device (sensor with heating element) that indirectly measures gas composition by detecting thermal conductivity changes. This mediator converts chemical composition information into thermal signals that can be measured without directly analyzing the gas samples.
2Measurement precision
If thermal conductivity sensors are used to measure hydrogen concentration, then real-time continuous measurement is possible, but the sensor is sensitive to humidity and temperature variations that can cause measurement errors
Solution Approach 1:
The patent applies local quality by creating a controlled measurement environment within the sensor housing. The heating element and sensor are positioned in a specific local zone where thermal conditions can be controlled and isolated from external humidity and temperature variations affecting the rest of the system.
Solution Approach 2:
The patent uses parameter changes by measuring thermal conductivity at different heating powers or temperatures. By varying the thermal input parameter and observing changes in heat dissipation, the system can distinguish between effects caused by hydrogen concentration versus those caused by ambient temperature or humidity variations.
3Speed
If the sensor is placed directly in the reactor environment for real-time measurement, then response time is improved, but the sensor is exposed to harsh conditions including humidity and liquid water that can damage it
Solution Approach 1:
The patent introduces an intermediary protective structure (housing with tap connection) that mediates between the harsh reactor environment and the sensitive sensor. This intermediary allows thermal and compositional information to pass through while blocking direct exposure to liquid water and excessive humidity.
Solution Approach 2:
The patent employs a protective housing structure that acts as a barrier shell. This shell is designed to be impermeable to liquid water while allowing thermal conduction and gas diffusion, creating a protective boundary that preserves sensor functionality in harsh environments.
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 design enhances the precision and speed of gas concentration measurements, reducing the risk of condensation and signal interference, allowing for optimized operation, improved safety, and efficient management of gas purity, thereby extending the longevity and efficiency of the reactor systems.
Implementation Method 1
gas concentration sensors by measurement, in particular of hydrogen, in gases in the environment of fuel cells, which are based on a measurement thermal conductivity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to an electrochemical reactor, such as a fuel cell or an electrolyzer, comprising: a stack (22) of electrochemical cells (25), each of which includes at least one electrode plate (108-1) having a surface electrically contacting an electrolyte; at least one tube (24) connected to said surface of each of the cells in a circuit for exchanging a gas with the outside of the stack; a sensor (11) sensitive to the composition of said gas in the circuit; and at least one member for tracking or monitoring the operating status of said reactor in accordance with the measurements of said sensor. The stack (22) of cells and the tube (24) form a unitary reactor body (15) that includes at least one chamber (20) built into said body and in communication with said tube. The gas composition sensor (11) is mounted in said unitary body and includes a sensitive unit (30) directly exposed to the in situ concentration of a component of said gas in said chamber (20).