Method of operating water electrolysis system and water electrolysis system
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Solution Overview
Problem
Water electrolysis systems face challenges in efficiently managing water temperature to prevent freezing and excessive cooling, particularly during winter conditions, which can lead to abnormal heating and membrane breakdown.
Innovation Solution
A method and system that incorporate a water circulation circuit, an antifreeze circulation circuit, and a heat exchanger, where the water circulation pump operates before starting water electrolysis, and the antifreeze circulation pump is set to a stopped state, allowing for controlled heat exchange to maintain optimal water temperature and prevent freezing, while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antifreeze circulation pump operates continuously to prevent freezing, then the water temperature is maintained above freezing point, but energy consumption increases unnecessarily during pre-startup phase
Solution Approach 1:
The control unit determines whether the antifreeze circulation pump should operate in advance based on predicted freezing risk. By assessing environmental temperature and system state before startup, the system performs preliminary evaluation to decide on pump operation, avoiding unnecessary energy consumption while ensuring freezing prevention when actually needed.
Solution Approach 2:
The system changes the operational parameters of the antifreeze circulation pump based on environmental conditions. When the environmental temperature is above the freezing point, the pump operation parameter is changed to 'stopped', reducing energy consumption. When temperature drops below freezing point, the parameter changes to 'operating' to ensure freezing prevention.
2Reliability
If the antifreeze circulation pump operates before water electrolysis starts, then water freezing is prevented, but water temperature becomes excessively low affecting electrolysis efficiency
Solution Approach 1:
The system performs preliminary assessment of freezing risk before water electrolysis starts. By evaluating environmental temperature and predicting potential freezing conditions, the control unit makes informed decisions about antifreeze pump operation in advance, preventing both freezing and excessive cooling by timing the pump operation appropriately.
Solution Approach 2:
The control unit continuously monitors environmental temperature and system state, using this feedback information to adjust the antifreeze circulation pump operation. The feedback mechanism ensures that the pump operates only when necessary to prevent freezing, and stops when environmental conditions are safe, thereby maintaining optimal water temperature for electrolysis efficiency.
3Productivity
If the water circulation pump operates continuously to maintain water flow, then heat exchange efficiency is improved, but energy consumption increases during idle periods
Solution Approach 1:
The water circulation pump operates periodically rather than continuously. The control unit determines pump operation based on whether water electrolysis is actually in progress. During idle periods before electrolysis starts, the pump operation is stopped or reduced, reducing energy consumption. When electrolysis begins, the pump operates to maintain efficient heat exchange.
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 effectively adjusts water temperature, prevents freezing, and reduces energy consumption by avoiding unnecessary operation of the antifreeze circulation pump, ensuring stable water electrolysis operations even in low temperatures.
Implementation Method 1
a heat exchanger configured to perform heat exchange between the water circulation circuit section and the antifreeze circulation circuit section
Implementation Method 2
a water electrolysis device that generates oxygen and hydrogen by electrolysis of water
Data Source
AI summary
A water electrolysis system includes a water electrolysis device; a water circulation circuit section including a water circulation pump; an antifreeze circulation circuit section including an antifreeze circulation pump; and a heat exchanger configured to perform heat exchange between the water circulation circuit section and the antifreeze circulation circuit section. Before water electrolysis is started by the water electrolysis device, a control device of the water electrolysis system circulates water by driving the water circulation pump and sets the antifreeze circulation pump to an operationally stopped state.