SOEC Gas Distribution Sealing Interface for High-Load Compression
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Solution Overview
Problem
High-temperature solid oxide electrolyser cells (SOEC) and fuel cells (SOFC) face challenges in sealing and electrical insulation due to the need for high compressive forces, which can lead to seal rupture and flexural deformation of plates, especially during repeated mounting and dismounting processes.
Innovation Solution
A gas distribution assembly with a sealing interface device featuring a strut and seals in a coupling plane, where the strut limits seal crushing and provides a more rigid support, reducing the risk of plate deformation and maintaining flatness over time, while ensuring high-temperature sealing and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high compressive force is applied to ensure sealing at high temperature, then sealing reliability is improved, but seal rupture and plate deformation occur
Solution Approach 1:
The patent introduces a compliance layer with specific mechanical properties (Young's modulus between 1-100 GPa) that changes its compressibility characteristics under load. This layer allows controlled deformation to maintain sealing contact pressure without transmitting excessive force to the seal, thereby maintaining sealing reliability while preventing seal rupture through parameter optimization of the compliance layer's mechanical properties
Solution Approach 2:
The compliance layer acts as an intermediary element between the clamping device and the seal. It absorbs and distributes the compressive force, preventing direct transmission of high clamping loads to the seal. This mediator layer ensures sealing contact while limiting the maximum stress transmitted to the seal, thus resolving the contradiction between achieving reliable sealing and preventing seal failure
2Reliability
If high compressive force is applied to ensure sealing, then sealing integrity is improved, but plate deformation increases
Solution Approach 1:
The compliance layer serves as a mechanical intermediary that decouples the clamping force application from the plate structure. It provides a compliant interface that maintains sealing pressure without rigidly transmitting bending moments to the plates, thereby preserving plate flatness while ensuring sealing integrity through controlled local deformation at the sealing interface
Solution Approach 2:
The compliance layer introduces localized compliance specifically at the sealing interface region, allowing controlled deformation where needed for sealing while maintaining overall plate rigidity. This local quality change enables the system to achieve sealing through localized adaptation without causing global plate deformation, thus resolving the contradiction between sealing integrity and plate flatness
3Ease of operation
If repeated mounting and dismounting is performed, then ease of operation is improved, but accumulation of deformation occurs
Solution Approach 1:
The compliance layer provides beforehand cushioning by absorbing mechanical stresses and deformations during each mounting and dismounting cycle. This protective layer prevents stress accumulation in the rigid plate structures, maintaining their flatness stability over repeated operations while enabling easy assembly and disassembly through controlled compliance at the sealing interface
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 solution effectively reduces the risk of seal rupture and plate deformation, maintaining sealing integrity and electrical insulation at high temperatures, even under high compressive stresses, thus extending the lifespan of the gas distribution assembly.
Implementation Method 1
the seals must withstand high temperatures (of the order of 600° C. to 1000° C.), and furthermore provide electrical insulation between the gas distribution device of the fixed installation and the SOEC/SOFC-type solid oxide stack
Implementation Method 2
A clamping stress of the order of one MPa, or several tens of MPa, is required to attain seal compression ratios, making it possible to ensure sealing
Data Source
AI summary
A gas distribution assembly comprises a first plate and a second plate parallel with each other, the first plate comprising gas communication orifices. A sealing interface device includes seals disposed around communication orifices and a strut disposed in a coupling plane between the first and second plates. The strut and the seals form a sealing interface having two planes of symmetry perpendicular with each other and perpendicular to the coupling plane, the thickness of the seals before coupling under pressure of the first and second plates being greater than the thickness of the strut. Use for a high-temperature solid oxide electrolyser or fuel cell.