Electrochemical Hydrogen Pump Humidity Control
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Solution Overview
Problem
The existing hydrogen supply systems face challenges in maintaining the moisture content of proton-conductive electrolyte membranes during the driving of electrochemical hydrogen pumps, leading to efficiency losses due to moisture lowering, especially when hydrogen with low dew points or in a dry state is supplied.
Innovation Solution
A hydrogen supply system that includes an electrochemical hydrogen pump with a proton-conductive electrolyte membrane, an anode, a cathode, and a humidity adjuster, where a controller increases the humidity of the anode and cathode flow paths when the relative humidity is less than 100% and the integrated driving time or applied voltage increases, thereby maintaining the membrane's moisture level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydrogen with low dew point or in dry state is supplied to the electrochemical hydrogen pump, then the hydrogen supply flexibility is improved, but the moisture content of the electrolyte membrane decreases leading to efficiency loss
Solution Approach 1:
The system incorporates a humidity sensor that continuously monitors the moisture content of the electrolyte membrane and provides feedback to the control unit. The control unit adjusts the humidity adjuster based on this feedback to maintain optimal moisture levels in the membrane while allowing flexible hydrogen supply conditions
Solution Approach 2:
A humidity adjuster is introduced as an intermediary component between the hydrogen supply and the electrochemical hydrogen pump. This device actively regulates the humidity of the hydrogen gas before it reaches the pump, ensuring the electrolyte membrane maintains appropriate moisture content regardless of the hydrogen source conditions
2Productivity
If the electrochemical hydrogen pump operates for extended periods or at high voltages, then the hydrogen pressurization output increases, but the moisture content of the electrolyte membrane decreases
Solution Approach 1:
The control unit receives continuous feedback from the humidity sensor about the electrolyte membrane's moisture content. When the membrane dries out during extended operation or high-voltage operation, the control unit automatically activates the humidity adjuster to restore proper humidity levels, allowing sustained high productivity without membrane degradation
Solution Approach 2:
The system performs preliminary humidification of the hydrogen gas through the humidity adjuster before it enters the electrochemical hydrogen pump. This preventive measure ensures the electrolyte membrane is pre-humidified before undergoing stress from extended or high-voltage operation, preventing moisture loss rather than correcting it after the fact
3Device complexity
If no humidity control is implemented, then the device complexity is reduced, but the voltage required for pump action increases reducing efficiency
Solution Approach 1:
The relatively simple feedback loop consisting of a humidity sensor, control unit, and humidity adjuster maintains optimal electrolyte membrane moisture content. This prevents the formation of high-resistance dry spots in the membrane that would otherwise require significantly higher operating voltages, reducing energy consumption with minimal added complexity
Solution Approach 2:
The system implements self-regulating humidity control where the humidity sensor automatically detects moisture levels and the control unit activates the humidity adjuster as needed. This self-service mechanism maintains optimal membrane conditions and efficient operating voltage without requiring complex external monitoring or manual intervention
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 solution effectively inhibits moisture content lowering in the electrolyte membrane, reducing the voltage required for pump action and maintaining high efficiency of hydrogen pressurization by controlling humidity levels during hydrogen supply to the reservoir.
Implementation Method 1
an electrochemical hydrogen pump that includes a proton-conductive electrolyte membrane... pressurizes and sends hydrogen which is supplied to the anode via the anode flow path to the cathode by applying a voltage
Implementation Method 2
water supplied to the anode side is electrolyzed, oxygen is thereby produced on the anode side, and hydrogen is thereby produced on the cathode side
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A
AI summary
A hydrogen supply system includes: an electrochemical hydrogen pump including a proton-conductive electrolyte membrane, an anode provided to a first and second main surfaces of the proton-conductive electrolyte membrane, respectively, an anode flow path and cathode flow path through which hydrogen flows, and a voltage applicator applying a voltage between the anode and cathode, pressurizing and sending hydrogen supplied to the anode to the cathode by applying a voltage by the voltage applicator, and supplying the pressurized hydrogen in the cathode flow path to a hydrogen reservoir; a humidity adjuster adjusting humidity of at least one of the anode and cathode flow paths; and a controller controlling the humidity adjuster to increase the humidity of at least one of the anode and cathode flow paths in supplying hydrogen with relative humidity of less than 100% to the anode flow path and driving the electrochemical hydrogen pump.