Fuel Cell Hydrogen Synthesis with Net Power and CO2 Sequestration
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Solution Overview
Problem
Conventional Green Hydrogen technologies do not produce net power and are economically challenged due to intermittency and high capital costs, especially when low-carbon electricity is not available, and they often result in significant CO2 emissions.
Innovation Solution
A method involving oxidizing a fuel in a power generator to produce electrical energy and a CO2-depleted water stream, followed by electrolysis to synthesize gaseous oxygen and hydrogen, which is then used to oxidize the fuel, while sequestering CO2, thereby increasing net energy production and reducing CO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional Green Hydrogen technologies are used, then hydrogen can be produced with low carbon emissions, but net power is not produced and capital costs are high
Solution Approach 1:
The patent combines power generation and hydrogen production into a single integrated system. The fuel cell stack generates electricity from hydrogen while producing water as a byproduct, which is then fed back to the reformer. This merging of functions allows the system to produce net power while maintaining low CO2 emissions, resolving the contradiction between clean hydrogen production and power generation capability.
Solution Approach 2:
The system performs multiple functions simultaneously: it produces hydrogen from hydrocarbons, generates electrical power through fuel cell oxidation, produces water for the reforming process, and captures CO2 emissions. This multi-functionality allows the system to achieve both low carbon emissions and net power production, eliminating the trade-off present in conventional Green Hydrogen technologies.
2Productivity
If steam methane reforming is used to produce hydrogen, then hydrogen can be produced efficiently, but significant CO2 emissions are generated
Solution Approach 1:
The patent converts the harmful CO2 emissions from the reforming process into a beneficial resource by capturing them and utilizing them in the fuel cell stack. The CO2 produced during steam methane reforming is fed to the fuel cell where it participates in the electrochemical oxidation of hydrogen, effectively converting the waste product into useful electrical energy while maintaining high hydrogen production efficiency.
Solution Approach 2:
Instead of discarding CO2 emissions as waste products, the system recovers and reutilizes them in the fuel cell stack. The CO2 captured from the reformer outlet is directed to the fuel cell inlet, where it is consumed in the electrochemical reaction. This recovery approach maintains efficient hydrogen production while eliminating net CO2 emissions to the atmosphere.
3Object-generated harmful factors
If water electrolysis is used to produce hydrogen, then hydrogen can be produced with low carbon footprint, but no net energy is produced and the process is economically challenged
Solution Approach 1:
The patent inverts the conventional approach by using fuel cell oxidation instead of water electrolysis. Instead of consuming electrical energy to split water and produce hydrogen, the system uses the reverse reaction where hydrogen and oxygen from water combine to generate electrical energy. This inversion enables net energy production while maintaining a low carbon footprint, directly addressing the economic challenges of conventional electrolysis.
4Device complexity
If CO2 is vented to the atmosphere during hydrogen production, then the process becomes simpler, but greenhouse gas emissions increase
Solution Approach 1:
The fuel cell stack acts as an intermediary that processes CO2 emissions from the reforming process. Instead of venting CO2 directly to the atmosphere, the system uses the fuel cell as an intermediate device to convert CO2 and hydrogen into electrical energy and water. This intermediary approach maintains relative process simplicity while effectively eliminating greenhouse gas emissions through electrochemical conversion.
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 net energy production by up to 99% and decreases CO2 emissions by up to 99% compared to traditional methods, achieving a low CO2 footprint for hydrogen synthesis.
Implementation Method 1
oxidizing a fuel in a power generator to generate electrical energy
Implementation Method 2
oxidizing a fuel in a power generator to generate electrical energy
Implementation Method 3
electrolyzing H2O from the CO2-depleted H2O stream using the generated electrical energy to synthesize gaseous O2 and H2
Implementation Method 4
The synthesized gaseous O2 subsequently oxidizes at least a portion of the fuel
Implementation Method 5
separating most of the CO2 from the exhaust to produce a CO2-depleted H2O stream
Data Source
AI summary
Methods and systems for synthesizing NH3 with a very low CO2 footprint are provided. A fuel is oxidized in a power generator to generate electrical energy and an exhaust comprising CO2 and H2O. CO2 and H2O in the exhaust are separated to produce a CO2-depleted H2O stream and a CO2 stream. H2O from the H2O stream is electrolyzed using the generated electrical energy to synthesize gaseous O2 and the H2. The synthesized gaseous O2 is used, at least in part, to oxidize the fuel in the power generator. The CO2 in the CO2 stream is sequestered. Ammonia (NH3) with a very low CO2 footprint is synthesized from the H2 and gaseous N2.