Hydrogen Sensor Placement for Fuel Cell Anode Purge Control
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Solution Overview
Problem
Conventional hydrogen concentration control technologies for fuel cell systems face challenges in precisely measuring hydrogen concentration and impurity levels, leading to potential anode damage and reduced durability due to the influence of condensation water and the need for expensive impedance measuring devices.
Innovation Solution
A hydrogen concentration control device and method that includes a sensor in the hydrogen storage device or supply tube to estimate hydrogen and impurity concentrations, triggering purge control when levels fall below reference values to maintain stable operation by discharging gases and impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance measuring device is used to determine hydrogen concentration, then hydrogen concentration can be measured, but the device cost increases significantly
Solution Approach 1:
The patent replaces the expensive impedance measuring device with a simple hydrogen concentration sensor that provides accurate measurements at a fraction of the cost. The sensor is a disposable, low-cost component that directly measures hydrogen concentration without requiring complex impedance analysis equipment.
Solution Approach 2:
The patent substitutes the electrical impedance measurement system with a direct chemical sensing approach. Instead of using electrical properties to indirectly determine hydrogen concentration, the system uses a hydrogen concentration sensor that directly detects the chemical composition of the gas mixture.
2Measurement precision
If conventional hydrogen concentration control is used, then hydrogen concentration can be monitored, but condensation water affects measurement accuracy
Solution Approach 1:
The patent introduces a hydrogen concentration sensor as an intermediary measurement device that is positioned and designed to be unaffected by condensation water. The sensor provides accurate hydrogen concentration readings even in the presence of moisture, effectively mediating between the harsh operating environment and the measurement requirement.
Solution Approach 2:
The patent uses a hydrogen concentration sensor that creates an accurate representation of the true hydrogen concentration despite the presence of condensation water. The sensor measurement serves as a reliable copy of the actual hydrogen concentration, independent of the harmful environmental factors.
3Ease of operation
If hydrogen purge control is not performed, then system operation is simpler, but anode damage occurs due to low hydrogen concentration
Solution Approach 1:
The patent implements a feedback control system where the hydrogen concentration sensor continuously monitors the hydrogen concentration in the anode, and the controller automatically initiates purge control when the concentration falls below the reference value. This closed-loop feedback ensures anode protection while maintaining simple operation, as the system self-regulates without complex manual intervention.
Solution Approach 2:
The system performs self-protection through automatic purge control triggered by the sensor. When hydrogen concentration drops, the system automatically purges the anode to restore proper concentration levels, eliminating the need for external monitoring or manual intervention to prevent anode damage.
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 ensures the hydrogen concentration in the anode channel is maintained above the reference value, preventing anode damage and ensuring stable fuel cell operation, regardless of varying hydrogen concentrations from different regional stations.
Implementation Method 1
a hydrogen concentration measuring sensor directly mounted in a hydrogen storage device
Implementation Method 2
an oxidation reaction of the hydrogen is initiated on the anode, thereby producing hydrogen ions (protons) and electrons
Implementation Method 3
an oxidation and reduction reaction of the reactant gases into electric energy
Implementation Method 4
an electrochemical reaction between the hydrogen ions and electrons moved from the anode and oxygen in the air
Implementation Method 5
The hydrogen ions and electrons produced thereby are moved to the cathode through an electrolyte membrane and a separator
Implementation Method 6
The hydrogen ions and electrons produced thereby are moved to the cathode through an electrolyte membrane
Data Source
AI summary
Disclosed is a device and method for controlling hydrogen concentration of a fuel cell system to maintain the concentration of hydrogen of an anode at a proper level in accordance with the concentration supplied to a fuel cell. More specifically, a hydrogen concentration measuring sensor is directly provided in a hydrogen storage device, the hydrogen concentration and the impurity concentration in an anode channel of the fuel cell system are estimated based on a measured hydrogen concentration, and when it is determined that the hydrogen concentration in the anode channel falls under a reference value at which the fuel cell system can be stably operated, purge control for discharging the gases (hydrogen and impurities) in the anode channel to the outside is performed, so that the hydrogen concentration in the anode channel of the fuel cell system can be maintained equal to or higher than the reference value.