Hybrid SOEC-PEC Electrolyzer for Storage-Free Hydrogen Startup
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Solution Overview
Problem
Existing hydrogen generation systems using solid oxide electrolyzer cells (SOECs) are complex and costly due to the need for hydrogen storage vessels and recycling systems, which increase cost and complexity.
Innovation Solution
Integrate both SOEC modules and polymer electrolyte cell (PEC) modules, such as proton exchange membrane (PEM) or anion exchange membrane (AEM) cells, to generate and supply hydrogen, eliminating the need for hydrogen storage vessels and simplifying the system design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen storage vessels and recycling systems are used in SOEC-based hydrogen generation systems, then hydrogen production reliability is improved, but system complexity and cost increase
Solution Approach 1:
The patent combines SOEC modules and PEC modules into a single integrated electrolyzer system. The PEC module generates hydrogen during startup and emergency modes, while the SOEC module handles steady-state operation, eliminating the need for separate hydrogen storage vessels and recycling systems. This merging reduces system complexity while maintaining reliability through complementary operation modes.
Solution Approach 2:
The integrated system provides multiple functions through different operating modes: the PEC module serves as a startup generator and emergency backup, while the SOEC module provides efficient steady-state hydrogen production. The system can operate in various modes (startup, shutdown, emergency, steady-state) without requiring additional dedicated equipment, achieving multi-functionality that reduces overall system complexity.
2Reliability
If hydrogen storage vessels and recycling systems are used in SOEC-based hydrogen generation systems, then hydrogen production stability is improved, but manufacturing cost increases
Solution Approach 1:
By merging SOEC and PEC modules into one integrated system, the patent eliminates the need for separate hydrogen storage vessels and recycling infrastructure. This consolidation reduces manufacturing costs while maintaining production stability through the complementary capabilities of the two cell types operating in different modes.
Solution Approach 2:
The PEC module serves itself as a startup generator and emergency backup, producing hydrogen on-demand without requiring external storage or recycling systems. The SOEC module similarly self-regulates during steady-state operation. This self-service capability eliminates the need for additional manufactured components, reducing overall manufacturing cost while ensuring stable hydrogen production.
3Loss of time
If PEC modules are integrated with SOEC modules, then startup time is reduced, but system complexity increases
Solution Approach 1:
The PEC module is designed to generate hydrogen during startup mode before the SOEC module reaches full operational temperature. This preliminary action by the PEC module eliminates startup delays, as hydrogen production begins immediately without waiting for the SOEC thermal ramp-up, thereby reducing overall startup time despite the added complexity of integrating two cell types.
4Adaptability or versatility
If PEC modules are used to generate hydrogen during startup and emergency modes, then system adaptability is improved, but operational complexity increases
Solution Approach 1:
The system dynamically switches between different operating modes based on real-time conditions: PEC module operates during startup and emergency modes, while SOEC module handles steady-state operation. This dynamic adaptation to different operational requirements improves system versatility. The control system automates mode transitions, managing operational complexity through intelligent control rather than 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
The integrated system reduces complexity and cost while maintaining efficient hydrogen production, with faster startup times and improved efficiency through the use of PEC modules, which can generate hydrogen during startup, shutdown, and emergency modes.
Implementation Method 1
a polymer electrolyte cell (PEC) module comprising PECs and configured to generate the inlet hydrogen by electrolysis of water
Implementation Method 2
solid oxide electrolyzer cell (SOEC) modules configured to convert steam into a main product stream comprising hydrogen
Implementation Method 3
oxygen ions are transported from the cathode side (air) to the anode side (fuel) and the driving force is the chemical gradient of partial pressure of oxygen across the electrolyte
Implementation Method 4
a mixer configured to mix inlet hydrogen with steam provided to the SOECs
Data Source
AI summary
A method of operating an electrolyzer system includes electrolyzing water into oxygen and inlet hydrogen using a polymer electrolyte cell (PEC) module including PECs, providing the inlet hydrogen to solid oxide electrolyzer cell (SOEC) modules that each include at least one SOEC stack, providing steam to the SOEC modules, and electrolyzing the steam to generate oxygen and a main product stream containing hydrogen.