SOEC Stack Interconnectors for Variable H2/CO Ratios
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Solution Overview
Problem
Current methods for producing synthesis gas for fuel production have limitations, including the need for separate electrolyzers, lack of thermal coupling, and fixed H2/CO ratios, which restrict flexibility and increase costs.
Innovation Solution
A process and reactor design for high-temperature electrolysis of steam and carbon dioxide or nitrogen dioxide using a stack of SOEC cells with independent electrical and fluidic interconnectors, allowing for simultaneous but separate electrolysis of steam and carbon dioxide or nitrogen dioxide, enabling adjustable H2/CO ratios and flexible thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrolyzers are used for steam and CO2 electrolysis, then each electrolysis process can be independently optimized, but the device complexity and capital expenditure increase
Solution Approach 1:
The patent combines steam electrolysis and CO2 electrolysis into a single electrolyzer device with integrated compartments. The device includes a first compartment for steam electrolysis and a second compartment for CO2 electrolysis, both within one unified structure that shares common components such as the membrane and control systems, thereby reducing overall device complexity while maintaining independent process optimization
Solution Approach 2:
The single electrolyzer device performs multiple functions by simultaneously conducting both steam electrolysis and CO2 electrolysis processes. The integrated design allows the device to produce both H2 and CO gases while sharing common structural elements and operational controls, achieving multi-functionality without requiring separate dedicated electrolyzers for each process
2Device complexity
If steam and CO2 are mixed before electrolysis, then the process is simplified, but the H2/CO ratio becomes fixed and inflexible
Solution Approach 1:
The electrolyzer is segmented into distinct first and second compartments that handle steam and CO2 separately. This segmentation allows independent control of each electrolysis process while maintaining physical separation of reactants, enabling flexible adjustment of H2 and CO production rates to achieve desired H2/CO ratios without requiring complete mixing of gases
Solution Approach 2:
The system incorporates dynamic control capabilities that allow real-time adjustment of operating parameters such as voltage, current density, and gas flow rates for each compartment independently. This dynamic control enables flexible modulation of the H2/CO ratio according to downstream synthesis requirements while maintaining simplified integrated operation
3Loss of energy
If thermal coupling is implemented between electrolysis processes, then energy efficiency improves, but the control complexity increases
Solution Approach 1:
The integrated electrolyzer design allows the exothermic steam electrolysis process to naturally provide thermal energy to the endothermic CO2 electrolysis process through direct thermal contact between compartments. This self-service thermal coupling eliminates the need for external heat exchangers or complex thermal management systems, as the processes automatically balance each other's thermal requirements
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 allows for variable H2/CO ratios, efficient thermal management, and reduced capital expenditure by using a single electrolysis reactor, preserving the advantages of existing methods while overcoming their drawbacks.
Implementation Method 1
an electrolyte interposed between the cathode and the anode
Implementation Method 2
high-temperature electrolysis of steam H2O and carbon dioxide CO2
Data Source
AI summary
A method for high-temperature electrolysis of steam and another gas to be electrolyzed, chosen from carbon dioxide and nitrogen dioxide, implemented in an electrolysis reactor includes a stack of elementary electrolysis cells each made of a cathode, an anode and an electrolyte inserted between the cathode and the anode, and a plurality of electric and fluid interconnectors each arranged between two adjacent elementary cells with one of the surfaces thereof in electric contact with the anode of one of the two elementary cells and the other one of the surfaces thereof in electric contact with the cathode of the other one of the two elementary cells. The steam is supplied and distributed to the cathode of one of the two adjacent elementary cells and either carbon dioxide or nitrogen dioxide is supplied and distributed to the cathode of the other one of the two elementary cells.