Geothermal Steam Electrolysis for Lower-Energy Hydrogen Production
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Solution Overview
Problem
Extracting hydrogen from compounds like hydrocarbons and water using conventional methods requires significant energy, making it economically and environmentally inefficient.
Innovation Solution
A system and method utilizing geothermal energy to generate electrical power, produce steam, and dissociate hydrogen from steam using a solid oxide electrolyzer cell (SOEC), reducing the energy needed for electrolysis by leveraging geothermal fluid's thermal energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional methods such as electrolysis or steam reforming are used to split water or extract hydrogen from hydrocarbons, then hydrogen can be produced, but a significant amount of energy is required making it economically and environmentally inefficient
Solution Approach 1:
The invention changes the temperature parameter by using geothermal heat to raise water/steam temperature to 500-1000°C before electrolysis. This parameter change reduces the electrical energy required for hydrogen production while maintaining high production efficiency
Solution Approach 2:
The invention merges two processes: geothermal heating and electrolysis. The geothermal thermal energy pre-heats the water/steam, and the electrical energy completes the electrolysis process, combining thermal and electrical energy sources to achieve efficient hydrogen production
2Object-generated harmful factors
If hydrogen is extracted from hydrocarbons, then hydrogen can be obtained, but additional compounds are generated that are not environmentally friendly
Solution Approach 1:
The invention extracts only the hydrogen from water molecules through electrolysis, leaving oxygen as the only byproduct. This selective extraction eliminates harmful compounds that would be generated from hydrocarbon processing
Solution Approach 2:
The invention uses water (H2O) as the hydrogen source instead of hydrocarbons, creating an inherently cleaner process environment that produces only oxygen as a byproduct, eliminating harmful emissions
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
Reduces the energy required for hydrogen production, making it more economically and environmentally feasible by utilizing geothermal energy to generate hydrogen efficiently.
Implementation Method 1
the electrical power generation subsystem comprises a flash column and a turbine and the flash column is configured to generate steam from the geothermal fluid to drive the turbine
Implementation Method 2
the flash column is configured to generate steam from the geothermal fluid to drive the turbine
Implementation Method 3
the steam generation subsystem includes a heat exchanger configured to facilitate a transfer of of the thermal energy in the geothermal fluid to a portion of the purified water
Implementation Method 4
the hydrogen generation subsystem is configured to dissociate hydrogen from the steam using the electrical power generated by the electrical power generation subsystem
Data Source
AI summary
A system and method for generating hydrogen using thermal energy in a geothermal fluid are disclosed. An electrical power generation subsystem is configured to receive geothermal fluid from a geothermal fluid source and use thermal energy in the geothermal fluid to generate electrical power. A steam generation subsystem is configured to receive water and produce steam using thermal energy in the geothermal fluid and the electrical power generated by the electrical power generation subsystem. A hydrogen generation subsystem is configured to disassociate hydrogen from the steam using the electrical power generated by the electrical power generation subsystem.