Carbonate Fuel Cell Exhaust CO2 Separation and Recycling
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Solution Overview
Problem
Existing carbonate fuel cells produce excess carbon dioxide (CO2) that is not efficiently recycled or reused, leading to waste and emissions.
Innovation Solution
A fuel cell system with an internal mechanism to extract CO2 from the fuel exhaust stream, utilizing a fuel exhaust processing unit that separates and controls the flow of CO2 through fluid pathways, including a carbon processing unit for recycling or reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If CO2 is consumed by the cathode reaction, then power output is improved, but excess CO2 is expelled from the system causing waste and emissions
Solution Approach 1:
The exhaust stream is divided into multiple portions: one portion is recirculated to the anode for additional CO2 production and power generation, while another portion is directed to the cathode for power output. This segmentation allows simultaneous optimization of power output and CO2 utilization, preventing waste of excess CO2 while maintaining high power generation.
2Ease of operation
If excess CO2 is expelled from the fuel cell system, then system operation is simplified, but emissions increase and usable CO2 is wasted
Solution Approach 1:
Instead of simply discarding excess CO2 through exhaust, the system recovers CO2 from the anode exhaust stream and recirculates it back to the anode. This recovery process converts what would be waste emissions into a useful resource for continued power generation, thereby reducing harmful emissions while maintaining ease of operation through automated recirculation.
3Loss of substance
If CO2 rich fuel exhaust is recirculated to the anode, then CO2 recycling is improved, but system complexity increases
Solution Approach 1:
The system merges the exhaust stream recirculation path with the existing fuel cell operation. The controller integrates multiple functions (exhaust monitoring, CO2 concentration control, recirculation flow management) into a unified control system that works with the existing anode and cathode structures, achieving effective CO2 recycling without requiring completely separate complex subsystems.
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
Enhances CO2 recycling and reduces emissions by effectively extracting and utilizing CO2 for various applications, such as food products or chemical reagents, while optimizing system efficiency and power output.
Implementation Method 1
The fuel processing unit is configured to remove a first portion of carbon dioxide (CO2) from fuel exhaust within the slip stream and output the first portion of CO2 in a first stream
Implementation Method 2
a hydrocarbon based fuel (e.g., methane) may be fed through an anode-side inlet and undergo reforming within the fuel cell to generate H2 and CO2. The produced H2 may then react with carbonate ions from the contained electrolyte, producing additional CO2
Implementation Method 3
a hydrocarbon based fuel (e.g., methane) may be fed through an anode-side inlet and undergo reforming within the fuel cell to generate H2 and CO2
Data Source
AI summary
A fuel cell system includes a fuel cell stack having a plurality of fuel cells that each contain a plurality of fuel electrodes and air electrodes. The system includes a fuel receiving unit connected to the fuel cell stack, which receives a hydrocarbon fuel from a fuel supply. The system includes a fuel exhaust processing unit fluidly coupled to the fuel cell stack by a slip stream, where the fuel exhaust processing unit processes fuel exhaust from the fuel cell stack, and the slip stream is fluidly connected to an exhaust stream flowing from the fuel cell stack. The fuel processing unit removes a first portion of carbon dioxide (CO2) from fuel exhaust within the slip stream, outputs the first portion of CO2 in a first stream, and outputs a second portion of CO2 remaining from the fuel exhaust in the slip stream into a second stream, which includes hydrogen.