Fuel Cell–Reformer Integration for High-Purity Hydrogen Output
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Solution Overview
Problem
Current fuel cell systems integrated with steam methane reformers face inefficiencies in capturing and purifying hydrogen from flue gas streams, leading to suboptimal energy output and by-product management.
Innovation Solution
The integration of a fuel cell system with a steam methane reformer involves introducing flue gas to the cathode and a hydrocarbon stream to the anode, followed by hydrogen separation processes using pressure swing adsorption units to produce high purity hydrogen streams, while also managing carbon dioxide and tail gases effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If flue gas is introduced to the cathode and hydrocarbon stream to the anode for hydrogen production, then electrical energy output is improved, but hydrogen purity deteriorates due to mixed gas streams
Solution Approach 1:
The system segments the hydrogen production process into multiple streams: a first hydrogen-rich stream from the fuel cell anode and a second hydrogen-rich stream from the steam methane reformer. These segmented streams are then combined and processed through pressure swing adsorption to achieve high purity hydrogen, resolving the purity issue while maintaining high electrical energy output from the fuel cell operation.
Solution Approach 2:
A pressure swing adsorption unit serves as an intermediary device between the mixed gas streams and the final hydrogen product. This intermediary process selectively adsorbs impurities (CO2, water, other gases) while allowing hydrogen to pass through, thereby achieving high hydrogen purity (greater than 90%, preferably greater than 95%) from the combined hydrogen-rich streams.
2Manufacturing precision
If hydrogen separation processes are implemented to improve hydrogen purity, then hydrogen purity is improved, but device complexity increases due to additional separation units
Solution Approach 1:
The pressure swing adsorption unit performs multiple functions simultaneously: it purifies hydrogen from the first and second hydrogen-rich streams, concentrates the hydrogen, and manages the combined gas streams from both the fuel cell and reformer processes. This multi-functional approach achieves high hydrogen purity without requiring multiple separate purification systems, thereby limiting the increase in device complexity.
3Loss of substance
If carbon dioxide rich streams are managed separately to improve carbon dioxide capture, then carbon dioxide capture efficiency is improved, but loss of time increases due to additional separation steps
Solution Approach 1:
The system maintains continuous operation of the fuel cell, steam methane reformer, and pressure swing adsorption unit simultaneously. The pressure swing adsorption process continuously separates and purifies hydrogen from the combined streams while the fuel cell continuously generates electricity and the reformer continuously produces hydrogen-rich gas. This continuous operation achieves effective carbon dioxide capture without significant time loss, as all processes operate in parallel rather than sequentially.
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 approach enhances electrical energy output and hydrogen purity, allowing for efficient carbon dioxide capture and utilization, thereby improving overall system efficiency and reducing waste.
Implementation Method 1
In a fuel cell, a chemical process is used to convert hydrogen-rich fuel into electricity
Implementation Method 2
a steam methane reformer including a syngas stream
Implementation Method 3
hydrogen separation processes using pressure swing adsorption units
Data Source
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AI summary
A method of integrating a fuel cell with a steam methane reformer is provided. The system includes at least one fuel cell including an anode and a cathode, and a steam methane reformer including a syngas stream, and a flue gas stream. The method includes introducing at least a portion of the flue gas stream to the cathode, thereby producing a CO2 depleted flue gas stream and introducing a hydrocarbon containing stream to the anode, thereby producing an electrical energy output and a carbon dioxide and hydrogen containing stream from the fuel cell.