Hydrogen Production from CO2 via Biomethane Decomposition
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Solution Overview
Problem
Existing methods for producing gaseous hydrogen and solid carbon are energy-intensive and lack economic balance, with biomass storage and handling issues in microalgae-based processes, and inefficient carbon dioxide utilization.
Innovation Solution
A process capturing industrial gases and fumes to recover carbon dioxide and heat, using it to cultivate microalgae, followed by anaerobic fermentation or hydrothermal gasification to produce biogas, separating and thermally decomposing methane to produce hydrogen and solid carbon, with the option to mix natural gas methane for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If microalgae biomass is cultured from industrial gas effluent, then carbon dioxide fixation is achieved, but the biomass must be stored and handled before upgrading which increases complexity
Solution Approach 1:
The invention extracts carbon dioxide directly from industrial effluent gases and converts it into methane through microbial action, bypassing the need to cultivate, store, and handle microalgae biomass. The CO2 is taken out of the waste stream and transformed into a useful product (biogas) without requiring intermediate biomass storage facilities.
Solution Approach 2:
The invention introduces microbubbles as an intermediary medium to transfer carbon dioxide from the gas phase to the liquid phase where methanogenic bacteria can convert it to methane. This intermediary approach eliminates the need for biomass cultivation and storage while achieving CO2 fixation.
2Object-affected harmful factors
If gaseous hydrogen is produced from carbon dioxide fixation, then environmental value is improved, but the process becomes energy-intensive and economically unbalanced
Solution Approach 1:
The invention converts harmful carbon dioxide emissions into beneficial methane gas through anaerobic digestion. The CO2 that would otherwise be wasted or harmful is transformed into a valuable energy carrier (biogas), turning an environmental problem into an economic opportunity without requiring excessive energy input.
Solution Approach 2:
The system uses the waste heat from industrial processes to maintain the temperature required for anaerobic digestion, and the produced biogas can be used to power the system's own operations. This self-service approach minimizes external energy requirements and makes the process economically viable.
3Quantity of substance
If biomass transformation is carried out by anaerobic fermentation, then biogas is produced, but the process requires careful separation and handling of digestate and biogas
Solution Approach 1:
The invention designs the biogas upgrading system to operate at pressures and temperatures that facilitate natural separation of gas and liquid phases. By maintaining equipotential conditions, the system enables easy decantation of digestate and straightforward collection of biogas without requiring complex separation equipment or extensive manual handling.
4Quantity of substance
If methane is thermally decomposed to produce hydrogen, then gaseous hydrogen and solid carbon are obtained, but the process requires high energy input
Solution Approach 1:
The invention uses phase transition of water (steam reforming) to facilitate methane conversion to hydrogen. By introducing steam and utilizing the phase change from liquid to gas, the process lowers the activation energy required for methane decomposition and enables hydrogen production at more moderate temperatures, reducing overall energy loss.
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 process reduces the levelized cost of hydrogen production, achieves a balanced economic and environmental value chain, and allows for the consumption of CO2, while enabling the reuse of biomass and heat in subsequent stages.
Implementation Method 1
supplying the extracted carbon dioxide and the heat recovered in step a) to a bioreactor vessel containing a nutrient medium at enriching with carbon dioxide for a rapidly growing biomass culture composed of strains of microalgae, or macroalgae
Implementation Method 2
the transformation by anaerobic fermentation or by hydrothermal gasification of the biomass cultured in step b) for the production of a recoverable digestate and a biogas comprising at least methane and carbon dioxide
Implementation Method 3
the thermal decomposition of methane to produce carbon in the solid state and gaseous hydrogen
Data Source
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AI summary
A process for producing gaseous hydrogen and solid carbon involves capturing and utilizing gases and fumes from industrial sources or from the outlet of a heating network directly on-site, releasing the gases and fumes before their release into the atmosphere. The process includes, in particular, the cultivation of fast-growing biomass to produce biomethane. This biomethane, mixed with methane from the natural gas distribution network, undergoes thermal decomposition to produce gaseous hydrogen and solid carbon.