Internally Manifolded Interconnects for SOFC Thermal Gradient Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High temperature fuel cell systems, such as solid oxide fuel cell (SOFC) systems, face challenges in efficiently distributing fuel and air due to thermal gradients, which can lead to interconnect warping, cracking, and reduced fuel utilization rates.
Innovation Solution
The development of partial counterflow interconnects that provide multidirectional fuel paths opposite and perpendicular to air flow paths, reducing thermal gradients and eliminating cool and hot corner effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-direction fuel distribution is used in internally manifolded stacks, then the structure is simple, but thermal gradients cause interconnect warping and cracking
Solution Approach 1:
The interconnect is segmented into multiple independent flow fields (first fuel flow field, second fuel flow field, air flow field) with separate inlet and outlet manifolds. This segmentation allows independent control of fuel and air flow paths, enabling the creation of counter-flow configurations that balance thermal gradients across the interconnect structure, thereby preventing warping and cracking while maintaining structural integrity
Solution Approach 2:
The patent introduces a multi-dimensional flow distribution system with inlet manifolds and outlet manifolds positioned at opposite ends of the interconnect. Fuel flows through one set of channels while air flows through separate channels in the opposite direction, creating a three-dimensional flow pattern that effectively distributes thermal loads and eliminates hot and cold corners without requiring complex external manifold systems
2Productivity
If traditional fuel distribution is used, then the interconnect structure is simple, but fuel utilization rate is reduced
Solution Approach 1:
The patent inverts the traditional co-flow configuration by implementing a counter-flow arrangement where fuel enters at one end and air enters at the opposite end. This inversion ensures that fresh fuel consistently contacts the fuel electrode across the entire active area, maximizing fuel utilization rate. The separate inlet and outlet manifolds enable this reverse flow pattern while maintaining a relatively simple interconnect structure
Solution Approach 2:
The interconnect is designed with multi-functionality, serving as both a structural separator between cells and an active flow distribution system. The inlet manifolds and outlet manifolds are integrated into the interconnect body, allowing it to perform both mechanical support and fluid distribution functions. This multi-functionality enables improved fuel utilization without proportionally increasing device complexity
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 partial counterflow design reduces thermal gradients, preventing interconnect warping and cracking, and enhances fuel utilization rates, thereby improving the efficiency and reliability of high temperature fuel cell systems.
Implementation Method 1
The fuel cell, operating at a typical temperature between 750° C. and 950° C., enables the transport of negatively charged oxygen ions from the cathode flow stream to the anode flow stream
Implementation Method 2
The partial counterflow design reduces thermal gradients, preventing interconnect warping and cracking
Data Source
AI summary
An interconnect includes fuel inlets and outlets that extend through the interconnect at first and second peripheral edges, an air side, and an opposing fuel side. The air side includes an air field including air channels that extend in a first direction, from a third peripheral edge to an opposing fourth peripheral edge, and air side seal surfaces surrounding the first fuel inlet and the first fuel outlet. The fuel side includes a fuel field including fuel channels that extend in the first direction, a fuel inlet manifold configured to fluidly connect the first fuel inlet to first ends of the fuel channels, a fuel outlet manifold configured to fluidly connect the first fuel outlet to second ends of the fuel channels, and a fuel side seal surface extending along the first, second, third, and fourth peripheral edges.