Producing hydrogen, electricity and freshwater with one reactor
A proposed tri-generation system uses a small modular reactor to deliver clean electricity, hydrogen fuel and desalinated water from the same energy source The post Producing hydrogen, electricity and freshwater with one reactor appeared first on Physics World .
Hydrogen, clean electricity, and freshwater can all be produced using a single small nuclear reactor, according to new research. Conventional hydrogen production from natural gas creates significant carbon dioxide emissions, so there is growing interest in low-carbon alternatives. Water splitting via electrolysis requires electricity and additional water resources.
Scientists investigated whether a modular nuclear reactor could simultaneously generate hydrogen, electricity, and freshwater. A 200 MW thermal-power small modular reactor was used, with the heat producing steam for electricity generation and a process called High-Temperature Steam Electrolysis to split water into hydrogen and oxygen.
The steam's residual heat was then utilized in a seawater desalination plant to create freshwater. The integrated tri-generation system could produce 90 MW of electricity, 0.6 kg/s of hydrogen (approximately 52 tonnes per day), and 612 m³/day of freshwater from a single reactor module. By recycling waste heat from hydrogen production, energy utilization improved from 48% when generating electricity alone to 53% when producing all three outputs.
Two operating modes were evaluated: a self-sufficient mode where desalinated water is used internally for hydrogen production, and a market-led mode where freshwater is sold externally. The market-led approach resulted in lower hydrogen production costs ($2.93-3.19/kg compared to $3.49-3.88/kg in the self-sufficient scenario) due to additional revenue from water sales.
Overall, the study shows a small modular nuclear reactor could generate clean electricity, hydrogen, and freshwater, providing an efficient and potentially advantageous solution for water-stressed regions seeking low-carbon energy and industrial hydrogen supplies.
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