Electrochemical Based Modeling of Alkaline Water Electrolysis

Adamsen, Magnus Sejr

4. term

Energy Engineering, Master

2022

63

Klimakrisen og afhængigheden af fossile brændsler skaber behov for store mængder fleksibel energilagring, hvor grønt brint via vand­elektrolyse er en lovende løsning. Dette projekt undersøger, hvordan en elektrokemisk baseret model kan udvikles til at forudsige både statisk og dynamisk ydeevne for et alkalisk vandelektrolyseanlæg. Modellen opstilles ud fra elektrokemisk teori og tilpasses målte data fra et industrielt anlæg. Den viser meget høj nøjagtighed i den statiske drift med en forklaringsgrad på over R^2 > 98%. Scenarieanalyser med overskudsstrøm fra vind og sol indikerer en celle-energi­effektivitet omkring 75%, og tilsvarende effektivitet omkring 73% ved anvendelse til frekvensregulering. Resultaterne peger på, at modellen kan understøtte analyse og optimering af fremtidige brintløsninger drevet af vedvarende energi.

The climate crisis and reliance on fossil fuels create a need for large-scale, flexible energy storage, for which green hydrogen via water electrolysis is a promising option. This project develops an electrochemically based model to predict both the static and dynamic performance of an alkaline water electrolyzer. The model is formulated from electrochemical theory and calibrated against measurements from an industrial system. It reproduces static operation with high accuracy, achieving a coefficient of determination above R^2 > 98%. Scenario studies using surplus wind and solar power indicate a cell energy efficiency around 75%, with similarly high efficiency around 73% when providing frequency regulation. These results suggest the model can support analysis and optimization of future hydrogen systems powered by renewable electricity.

[This summary has been generated with the help of AI directly from the project (PDF)]

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