Water Electrolysis Hydrogen Dehumidification via Variable Temperature Control
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Solution Overview
Problem
Current water electrolysis systems face inefficiencies in hydrogen dehumidification due to long recovery times and high energy consumption, leading to hydrogen storage with water concentrations exceeding 5 ppm, which affects operational and economic efficiency.
Innovation Solution
A water electrolysis system with a high-pressure hydrogen production unit, a gas-liquid separation unit, and a cooling unit on the hydrogen supply pipe for variable temperature control, utilizing a Peltier dehumidifier and heat exchanger to efficiently dehumidify hydrogen, and a method to prevent electrolysis stoppage during initial startup or maintenance to maintain low water concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dehumidification unit with heating wire and cooling trace is used to remove water from hydrogen, then water concentration in hydrogen is reduced, but recovery time increases and energy consumption increases
Solution Approach 1:
The patent changes the temperature parameter of the dehumidifying agent dynamically. Instead of heating the entire vessel body as in conventional systems, the system controls the temperature of the dehumidifying agent itself by introducing temperature-controlled gas through the cooling trace, enabling faster recovery cycles while maintaining dehumidification effectiveness
Solution Approach 2:
The patent extracts the water removal function from the main vessel body heating process. By using a separate cooling trace system that introduces temperature-controlled gas, the dehumidification process is separated from the general heating process, allowing independent optimization of each function and reducing overall recovery time
2Manufacturing precision
If a dehumidification unit with heating wire is used to remove water from hydrogen, then water concentration in hydrogen is reduced, but energy consumption increases
Solution Approach 1:
The system uses the cooling gas circulation to simultaneously cool the dehumidifying agent and prepare it for the next dehumidification cycle. The gas that absorbs heat from the dehumidifying agent is then redirected to cool other components, creating a self-sustaining thermal management system that reduces external energy input requirements
Solution Approach 2:
The patent changes from constant high-temperature heating to dynamic temperature control of the dehumidifying agent. By adjusting the temperature of the cooling gas introduced through the cooling trace, the system optimizes the balance between dehumidification effectiveness and energy consumption, avoiding excessive heating
3Ease of operation
If electrolysis is stopped during initial startup or maintenance, then system operation is simplified, but water concentration in hydrogen storage increases
Solution Approach 1:
The system performs preliminary dehumidification of the hydrogen storage unit before normal operation begins. By introducing dry hydrogen or inert gas through the cooling trace during startup, the system pre-cools and pre-dry the storage environment, preventing water condensation when electrolysis resumes and maintaining low water concentrations without requiring continuous operation
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
The system achieves efficient and reliable hydrogen dehumidification, reducing energy consumption and maintaining low water concentrations in hydrogen storage, thereby improving operational and economic efficiency while ensuring continuous dry hydrogen supply.
Implementation Method 1
utilizing a Peltier dehumidifier and heat exchanger to efficiently dehumidify hydrogen
Implementation Method 2
utilizing a Peltier dehumidifier and heat exchanger to efficiently dehumidify hydrogen
Implementation Method 3
cooling unit on the hydrogen supply pipe for variable temperature control
Data Source
AI summary
A water electrolysis system includes a high-pressure hydrogen production unit for electrolyzing water to generate oxygen and high-pressure hydrogen (the pressure of the high-pressure hydrogen being higher than that of the oxygen), and a gas-liquid separation unit for removing water contained in the high-pressure hydrogen. The gas-liquid separation unit is placed on a hydrogen pipe for discharging the high-pressure hydrogen from the high-pressure hydrogen production unit. In addition, the water electrolysis system includes a high-pressure hydrogen supply pipe for transferring dewatered high-pressure hydrogen from the gas-liquid separation unit, a cooling unit, which is placed on the high-pressure hydrogen supply pipe and is capable of variably controlling the temperature of the high-pressure hydrogen to adjust the humidity of the high-pressure hydrogen, and a control unit.