Solid Oxide Fuel Cell Integrated Catalytic Afterburner
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Solution Overview
Problem
Existing solid oxide fuel cell systems face challenges with incomplete fuel gas oxidation, leading to post-combustion requirements, which can result in back-diffusion of water vapor, undefined flow and pressure conditions, and increased installation complexity, including space and sealing issues at high temperatures.
Innovation Solution
A modular solid oxide fuel cell system with integrated catalytic afterburners and reformers, where each fuel cell or group of fuel cells has a dedicated afterburner and reformer, allowing for internal post-oxidation and reforming, with channels for direct exhaust gas flow and catalytically active coatings for efficient post-combustion and reduced plant effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-combustion spaces are connected to all stacked fuel cells, then complete oxidation of fuel gas components can be achieved, but back-diffusion of water vapor occurs causing damage to anodes
Solution Approach 1:
The patent divides the post-combustion system into separate individual post-combustion spaces for each fuel cell, rather than using a common post-combustion space. This segmentation prevents water vapor back-diffusion from affecting multiple cells simultaneously and allows independent control of each cell's post-combustion process, thereby maintaining oxidation completeness while preventing harmful back-diffusion effects.
2Reliability
If additional post-combustion components are attached around the fuel cell stack, then exhaust gas treatment can be achieved, but installation complexity and space requirements increase
Solution Approach 1:
The patent integrates the post-combustion spaces directly into the fuel cell stack structure, merging the exhaust gas treatment function with the existing fuel cell components. The post-combustion spaces are formed within the stack assembly itself rather than as separate external components, which reduces installation complexity and space requirements while maintaining effective exhaust gas treatment capability.
3Reliability
If separate afterburners and reformers are used for each fuel cell, then complete post-oxidation can be achieved, but manufacturing cost and system complexity increase
Solution Approach 1:
The patent designs the bipolar plates to serve multiple functions: they act as electrical conductors between cells, provide structural support, and form the walls of individual post-combustion spaces. This multi-functionality eliminates the need for separate dedicated post-combustion chambers, reducing manufacturing cost and complexity while maintaining effective post-oxidation capability through the integrated design.
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 enables efficient, flexible, and cost-effective post-combustion of exhaust gases, reduces the need for additional components, and enhances the volume-specific and mass-specific power density while minimizing sealing challenges and operational complexity.
Implementation Method 1
a catalytic post-oxidation of the exhaust gas mixture formed in the exhaust gas at the anode side and at the cathode side can be carried out
Implementation Method 2
a reforming of a fuel present as a hydrocarbon compound, for example methane or natural gas, is carried out. For this purpose, reformers are used in which a water vapor reforming can frequently be carried out
Data Source
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AI summary
The invention relates to a solid oxide fuel cell system, wherein planar fuel cells are arranged in stacked form and in this respect an integrated post- combustion of non-oxidized components, or of not fully oxidized components, in the exhaust gas can take place. The fuel cells of a system in accordance with the invention have a cathode-electrolyte-anode unit. A bipolar plate is arranged between two respective fuel cells and channels for the supply and removal of a fuel gas to anodes and of an oxidizing agent to cathodes are present. The exhaust gases at the anode side or at the cathode side are introduced via internal additional channels or directly into an afterburner in which a catalytic post-oxidizing of the exhaust gas mixture formed with the exhaust gas at the anode side and at the cathode side takes place. In this respect, a catalytic afterburner is associated with every single fuel cell or with a group formed of a plurality of fuel cells and the afterburners are arranged so that exhaust gas discharged from a fuel cell at the anode side or at the cathode side can enter directly into an afterburner.