Integral Gas Distribution Manifold for SOFC Stack Sealing
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Solution Overview
Problem
Existing solid oxide fuel cell (SOFC) systems face issues with suboptimal gas distribution and frequent leakage due to the need for thick, massive base plates and rigid manifolds, leading to increased weight, size, cost, and complexity, as well as localized overheating from combustible gas mixing with hot air.
Innovation Solution
An integral gas distribution manifold is integrated directly with the SOFC stack, eliminating the need for a separate base plate and using high-temperature bonding seals to prevent leakage, with fin structures for improved thermal balancing and heat exchange, and a simplified compressive loading mechanism using high-strength alloys and bolts or clamps for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate base plate and system manifold arrangement is used to maintain compressive sealing load, then sealing integrity is improved, but device complexity and weight increase
Solution Approach 1:
The patent merges the base plate and system manifold into a single integrated component. The manifold is designed with a mounting surface that directly receives the stack, eliminating the need for a separate base plate. This integration reduces the number of parts and assembly steps while maintaining sealing integrity through a simplified gasket arrangement between the stack and manifold.
Solution Approach 2:
The manifold serves multiple functions: it distributes gases to the stack, provides structural support, and maintains compressive sealing load. By combining these functions into a single component, the design eliminates the need for separate base plate and manifold elements, reducing complexity while preserving sealing reliability.
2Reliability
If a thick and massive base plate is used to maintain uniform compressive load on the gasket, then sealing reliability is improved, but weight and device complexity increase
Solution Approach 1:
The manifold is integrated with the mounting structure, eliminating the need for a separate massive base plate. The manifold itself is designed to provide the necessary structural support and maintain compressive load on the gasket, reducing weight while preserving sealing reliability.
3Reliability
If a rigid system manifold is used to maintain uniform compressive load against the base plate, then sealing integrity is improved, but cost and device complexity increase
Solution Approach 1:
The manifold is integrated with the mounting structure, simplifying the overall assembly. The unified design reduces structural complexity while maintaining the rigidity needed for sealing integrity through optimized manifold geometry and material selection.
4Reliability
If the stack compressive loading mechanism is made heavier duty to provide sufficient load for the gasket, then sealing reliability is improved, but weight and device complexity increase
Solution Approach 1:
The compressive loading function is integrated into the manifold-stack assembly. The manifold itself provides the structural means to apply and distribute compressive load to the gasket, eliminating the need for a separate heavy-duty loading mechanism and reducing overall weight.
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 design reduces leakage, weight, and complexity while enhancing durability and reliability by ensuring even gas distribution and temperature matching, and simplifying the assembly process, thereby improving the overall performance and efficiency of the SOFC power unit.
Implementation Method 1
hermetically joined by a high temperature bonding seal such as glass, ceramic adhesive, or braze, thus preventing leakage therebetween
Implementation Method 2
an individual stack manifold includes fin structures extending into adjacent fuel gas and cathode air chambers to enhance thermal balancing of gas temperatures
Implementation Method 3
a simplified compressive loading mechanism using high-strength alloys and bolts or clamps for secure mounting
Data Source
AI summary
An SOFC stack module including an integral individual stack manifold containing all of the gas pathways necessary for supply and exhaust of fuel gas and cathode air to and from the stack chimneys. The stack is mounted and hermetically joined directly to the manifold without an intermediate base plate. Flanges at the inlet and outlet ports couple to system distributary manifolds via high temperature sealing joints. The manifold preferably is fabricated of a ferritic stainless steel, and may be formed in a one-piece casting, a combination of multiple castings and stamped plates metallurgically joined (brazed or welded together), or stamped from sheet metal stock. Preferably, the manifold includes fin structures extending into adjacent fuel gas and cathode air chambers to enhance balancing of temperatures by heat exchange therebetween. Heat exchange may be further improved by configuring the manifold to have a plurality of interleaved anode and cathode gas supply chambers.