High-Temperature Electrolysis Steam Generation with Heat Storage Control
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Solution Overview
Problem
Existing electrolysis systems face issues with heat wastage and the need for larger heat storage units due to inefficient heat management during system startup and high-temperature standby modes.
Innovation Solution
An electrolysis system with a steam generation unit that utilizes a refrigerant heat exchange to manage heat input from a heat storage unit, controlled to reduce heat input during system startup and high-temperature standby, thereby optimizing heat usage and reducing the size of the heat storage unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat storage unit is provided to store heat for stable supply to the heat pump, then heat can be supplied stably, but the heat storage unit may need to be increased in size
Solution Approach 1:
The system dynamically adjusts the heat storage supply amount based on operational phase. During system startup or high-temperature standby, the control unit reduces heat storage supply to minimize waste, while during normal operation it increases supply to ensure stable heat delivery. This dynamic adjustment allows the heat storage unit to be smaller while maintaining reliability when needed.
Solution Approach 2:
The control unit changes the parameter of heat storage supply amount according to the operational phase. By adjusting this parameter (reducing it during startup/standby and maintaining or increasing it during normal operation), the system optimizes both heat storage unit size and heat supply stability.
2Reliability
If heat is wasted during system startup or high-temperature standby, then the heat storage unit needs to be larger to compensate, but this increases system cost and complexity
Solution Approach 1:
The control unit monitors the operational phase of the electrolysis system and provides feedback control on heat storage supply. During system startup or high-temperature standby, it reduces heat storage supply to prevent wastage, while during normal operation it ensures adequate supply. This feedback mechanism eliminates unnecessary heat waste while maintaining heat supply stability.
Solution Approach 2:
The system transitions from static heat storage supply to dynamic adjustment based on operational needs. By making the heat storage supply amount variable according to the operational phase, the system prevents heat wastage during startup/standby while ensuring stability during normal 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
Efficient utilization of unused exhaust heat for steam generation, minimizing heat wastage, and reducing the size of the heat storage unit, thus enhancing system efficiency and stability.
Implementation Method 1
a refrigerant heat exchange unit configured to perform heat exchange between heat of a heat storage unit and a refrigerant, generates a steam by heating raw material water via the refrigerant subjected to the heat exchange
Implementation Method 2
generates a steam by heating raw material water via the refrigerant subjected to the heat exchange in the refrigerant heat exchange unit
Implementation Method 3
an electrolysis cell configured to generate hydrogen by high-temperature steam electrolysis
Data Source
AI summary
An electrolysis system includes: an electrolysis cell configured to generate hydrogen by high-temperature steam electrolysis; a steam generation unit that has a refrigerant heat exchange unit configured to perform heat exchange between heat of a heat storage unit and a refrigerant, generates a steam by heating raw material water via the refrigerant subjected to the heat exchange in the refrigerant heat exchange unit, and supplies the steam to the electrolysis cell; a heat storage supply unit that has the heat storage unit and configured to supply heat of the heat storage unit to the refrigerant heat exchange unit; and a control unit configured to control the heat storage supply unit such that an amount of heat input to the refrigerant heat exchange unit is smaller during a system startup or during a high-temperature standby than during a normal operation.