Water Electrolysis Stack Current Control for Membrane Protection
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Solution Overview
Problem
The existing water electrolysis systems face issues with the dew point temperature of the gas-liquid separator being lowered, leading to potential drying and deterioration of the electrolyte membrane in the hydrogen pressure boosting stack, which can result in reduced water vapor supply and membrane degradation.
Innovation Solution
A water electrolysis system that includes a temperature sensor to detect the water temperature in the gas-liquid separator and a control device to adjust the current applied to the water electrolysis stack based on the electric resistance value of the hydrogen pressure boosting stack, ensuring accurate determination of membrane dryness and optimal water vapor supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water is supplied from the outside to replenish the water stored in the gas-liquid separator, then the water level in the gas-liquid separator is maintained, but the dew point temperature of the gas-liquid separator is lowered, causing the electrolyte membrane to dry and deteriorate
Solution Approach 1:
The control device monitors the dew point temperature of the gas-liquid separator and adjusts the current value applied to the water electrolysis stack accordingly. When the dew point temperature decreases (indicating potential membrane drying risk), the control device increases the current to generate more heat, thereby maintaining the dew point temperature above the predetermined threshold and preventing electrolyte membrane deterioration.
Solution Approach 2:
The system dynamically changes the current value parameter applied to the water electrolysis stack based on the dew point temperature. By adjusting this electrical parameter, the thermal state of the gas-liquid separator is controlled, ensuring the dew point temperature remains sufficiently high to prevent membrane drying while allowing water supplementation when needed.
2Ease of operation
If the dew point temperature of the gas-liquid separator is lowered, then water can be supplemented from the outside, but the amount of water vapor supplied to the hydrogen pressure boosting stack decreases, causing the electrolyte membrane to dry and deteriorate
Solution Approach 1:
The control device continuously monitors the dew point temperature as feedback and adjusts the current value to maintain membrane health. When external water supplementation occurs and the dew point temperature drops, the increased current compensates by generating additional heat and water vapor, ensuring the electrolyte membrane in the hydrogen pressure boosting stack remains properly humidified despite the temperature reduction.
Solution Approach 2:
The control device takes preliminary action by increasing the current before significant membrane drying occurs. By detecting the dew point temperature decrease in advance, the system proactively adjusts the operating parameters to prevent electrolyte membrane deterioration rather than waiting for damage to occur.
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 reduces the risk of electrolyte membrane deterioration by accurately controlling the water vapor supply to the hydrogen pressure boosting stack, maintaining membrane health and system efficiency.
Implementation Method 1
a water electrolysis stack configured to electrolyze water
Implementation Method 2
a temperature sensor configured to detect a temperature of the water in the gas-liquid separator
Implementation Method 3
control device configured to acquire an electric resistance value of the second power supply device
Data Source
AI summary
A water electrolysis system includes a water electrolysis stack, a gas-liquid separator, a hydrogen pressure boosting stack, a first power supply device, a second power supply device, and a control device. The control device acquires an electric resistance value of the second power supply device that applies a predetermined voltage to an anode and a cathode of the hydrogen pressure boosting stack, and controls a value of a current to be applied to the water electrolysis stack, based on the electric resistance value and the temperature of water in the gas-liquid separator.