Integrated Gas Superheating in SOEC Clamping Plates
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Solution Overview
Problem
Existing high-temperature solid oxide electrolyser and fuel cell stacks face challenges in efficient gas superheating due to complex and bulky tubular windings, which increase size, complexity, and require costly alumina deposition to prevent oxidation, while also limiting space for current feeds and thermocouples.
Innovation Solution
A compact integrated gas superheating system within the stack, featuring heating plates integrated into clamping plates and sinusoidal gas circulation paths, eliminating the need for external tubular windings and allowing for reusable and space-efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If complex tubular windings are used for gas superheating, then gas superheating function is achieved, but system size and complexity increase
Solution Approach 1:
The patent combines the gas superheating function with the clamping plates that already exist in the SOEC/SOFC stack structure. The heating plates are integrated directly into the clamping plates, merging two functions (clamping and heating) into a single component, thereby reducing system complexity while maintaining the gas superheating capability
Solution Approach 2:
The invention transitions from three-dimensional tubular windings to two-dimensional plate structures for heat transfer. The heating plates provide a large surface area for thermal exchange within the planar geometry of the clamping plates, achieving effective gas superheating without the spatial complexity of tubular arrangements
2Reliability
If alumina deposition is applied to prevent oxidation, then oxidation protection is achieved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts the oxidation protection requirement from the gas superheating system by using materials that are inherently oxidation-resistant at high temperatures. The heating plates and clamping plates are made from oxidation-resistant alloys, eliminating the need for separate alumina deposition protective coatings
Solution Approach 2:
The invention changes the material parameter of the clamping plates from standard metals to oxidation-resistant alloys capable of withstanding high-temperature operation without coating. This material substitution eliminates the need for complex deposition processes while maintaining reliability
3Temperature
If tubular windings are used for gas superheating, then gas heating function is achieved, but available space for current feeds and thermocouples is reduced
Solution Approach 1:
The patent merges the gas superheating function into the existing clamping plate structure, utilizing the space within and around the plates rather than adding separate tubular components. This integration preserves valuable space for current feeds and thermocouples while achieving the required gas heating function
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 solution reduces the complexity and size of the system, enables accurate temperature control, and minimizes head losses, while preventing pollution through reduced alumina treatment needs, facilitating efficient gas superheating and stack operation.
Implementation Method 1
a heating plate integrated in the thickness of at least one of the upper and lower clamping plates suitable for heating the gases to be heated
Implementation Method 2
at least one gas superheating end plate... each gas superheating end plate including a gas circulation circuit from a first end, where the gases to be heated arrive, to a second end, where the heated gases are discharged towards the stack
Data Source
AI summary
An assembly comprising a SOEC/SOFC-type solid oxide stack, and a clamping system for the stack. The assembly further comprises a system for superheating the gases at the inlet of the stack, comprising: a heating plate integrated within the thickness of at least one of the upper and lower clamping plates of the clamping system; an upper or lower end plate for superheating the gases, comprising a circuit through which the gases to be heated flow; and an inlet duct for the gases to be heated.