Single-Chamber Flame-Assisted Fuel Cell for Residential CHP
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Solution Overview
Problem
Conventional SOFCs face challenges such as high costs, sealing issues, and limitations in scalability and flexibility, making them unsuitable for residential and small-scale applications, and they require external heating for optimal operation.
Innovation Solution
Integration of a flame-assisted fuel cell (FFC) in a fuel-fired furnace or boiler, which acts as a no-chamber setup using a flame as a partial oxidation reformer and heat source, enabling efficient generation of both electricity and heat, and allowing for frequent start-ups and shut-downs without the need for sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional dual-chamber SOFCs are used for power generation, then electrical efficiency is improved, but sealing complexity and cost increase significantly
Solution Approach 1:
The patent removes the cathode chamber and sealing requirements entirely by operating the SOFC in a single-chamber configuration where only the anode is present. The cathode is exposed to ambient air, eliminating the need for sealed dual-chamber structures while maintaining electrical efficiency through direct electrochemical conversion of fuel to electricity.
Solution Approach 2:
The single-chamber SOFC design serves multiple functions: it generates electricity through electrochemical conversion, provides structural simplicity without sealing requirements, and enables direct integration with fuel sources. The same device structure handles both fuel input and electricity output without requiring separate sealed chambers.
2Power
If conventional SOFCs are used for stationary power generation, then electrical output is improved, but adaptability to frequent start-up and shut-down deteriorates
Solution Approach 1:
By removing the cathode chamber and sealing structures, the patent eliminates the thermal mass and structural constraints that limit frequent start-up and shut-down operations. The simplified single-chamber design can rapidly heat up and cool down without causing sealant damage or thermal stress failures.
Solution Approach 2:
The patent changes the operational parameters by eliminating the sealed dual-chamber structure, allowing the system to rapidly adjust temperature and fuel flow during start-up and shut-down cycles. This parameter change enables frequent operational transitions that would damage conventional SOFCs with sealants.
3Power
If external heating is provided to maintain SOFC operating temperature, then electrical efficiency is improved, but system complexity and cost increase
Solution Approach 1:
The patent merges the fuel combustion process with the SOFC electrochemical conversion process in a single chamber. The fuel that would otherwise be completely combusted externally is instead partially converted electrochemically, combining thermal and electrochemical energy conversion in one integrated system.
Solution Approach 2:
The single-chamber SOFC performs multiple functions simultaneously: it converts fuel to electricity through electrochemical reactions, generates heat through partial oxidation, and eliminates the need for separate external heating systems. The same structure that enables electricity generation also provides the thermal environment for optimal operation.
4Reliability
If fuel reformers or evaporators are added to prevent carbon coking, then fuel cell reliability is improved, but device complexity increases
Solution Approach 1:
The patent removes the need for external fuel reformers or evaporators by operating the SOFC directly on gaseous fuels like natural gas or propane. The single-chamber design allows direct electrochemical conversion of these fuels without requiring additional preprocessing equipment that would increase complexity.
Solution Approach 2:
The patent changes the operational parameters by using gaseous fuels that can be directly fed to the anode without liquid-phase reforming or evaporation. This parameter change in fuel state and delivery method eliminates the need for additional reforming equipment while maintaining reliability through controlled fuel delivery.
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 FFC system enhances energy efficiency, reduces electricity demand, and provides a cost-effective, scalable solution for residential and commercial applications, enabling independent operation during grid interruptions and efficient use of chemical energy for both heating and power generation.
Implementation Method 1
using a flame as a partial oxidation reformer
Implementation Method 2
providing the heat required for SOFC operation
Implementation Method 3
Fuel cells provide a clean and versatile means to directly convert chemical energy to electricity
Data Source
AI summary
The present invention relates to a flame-assisted fuel cell (FFC) and, more particularly, to the integration of a FFC in a fuel fired furnace or boiler to enable the generation of both electricity and heat from the fuel's chemical energy, transforming the furnace/boiler into a Combined Heating and Power (CHP) system.