SOFC Interconnect Cross-Flow Manifold Design
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Solution Overview
Problem
Existing solid oxide fuel cell (SOFC) interconnects face challenges in efficiently managing the flow of air and fuel, particularly in preventing reactant mixing and maintaining thermal stability, with current designs either leading to combustion or large temperature gradients.
Innovation Solution
The development of an interconnect structure with integrated anode and cathode flow fields configured for parallel flow, where manifold openings are arranged in a cross-flow orientation, allowing for efficient fuel and air distribution while preventing reactant mixing, using electrically conductive materials like stainless steel and nickel alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a counter-flow arrangement is used for fuel and air ports, then fuel reformation and energy production efficiency is improved, but the possibility of fuel-to-air leaks increases and manifold access to flow area is reduced
Solution Approach 1:
A seal member is introduced as an intermediary component between the fuel manifold opening and air manifold opening. This seal member extends across the flow area and prevents direct contact between fuel and air streams, thereby eliminating fuel-to-air leaks while maintaining the efficient counter-flow arrangement for energy production.
Solution Approach 2:
The flow area is segmented by the seal member into separate fuel and air flow paths. This segmentation ensures that fuel and air remain in distinct zones throughout the manifold, preventing mixing and leaks while allowing each stream to maintain its optimized flow pattern for maximum energy production.
2Productivity
If manifold openings are positioned adjacent to each other for counter-flow, then fuel reformation efficiency is improved, but access of the manifold to the flow area is reduced
Solution Approach 1:
The seal member extends in the vertical dimension across the flow area, creating a barrier that separates fuel and air streams without occupying horizontal manifold access space. This dimensional approach allows adjacent manifold openings to maintain efficient positioning while preserving adequate flow area access.
3Ease of manufacture
If a cross-flow design is used with manifold openings on opposing sides, then ease of manufacture and leak prevention are improved, but large temperature gradients develop
Solution Approach 1:
The seal member serves as a mediator that enables the use of cross-flow design with opposing manifold openings while mitigating the temperature gradient problem. By controlling the flow separation, it allows heat to distribute more uniformly across the cell while maintaining the manufacturing advantages of opposing manifold placement.
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 configuration enhances fuel cell performance by promoting uniform heat distribution, reducing the risk of reactant mixing, and facilitating easier manufacturing and assembly, leading to improved efficiency and operational stability of the SOFC stack.
Implementation Method 1
In the case of a solid oxide fuel cell, the oxygen ions are conducted through the electrolyte where they combine with ionized hydrogen to form water as a waste product and complete the process.
Implementation Method 2
This configuration enhances fuel cell performance by promoting uniform heat distribution
Data Source
AI summary
An internally-manifolded solid oxide fuel cell (SOFC) stack is described, including an anode interconnect structure integrated with a cathode interconnect structure. The anode interconnect structure includes a fuel flow field; and the cathode interconnect structure includes an air flow field. The two structures are configured to allow for parallel flow of air and fuel across a plane of the interconnect, while the manifold openings for the fuel are arranged in a cross-flow orientation across a plane of the interconnect structure. Related processes are also described, along with a power generation system that includes an SOFC incorporating this type of interconnect, attached directly or indirectly to at least one power block, such as a combustion engine.