Separation of Oxygen in Alkaline Electrolyser
2025
Øvretveit, Maja Oksum | Vågsæther, Knut
The study investigated the behavior of the species present in a gas-liquid separation system during varying operational conditions. The varying conditions included different temperatures into the last separator, 15 oC, 40 oC and 60 oC. As well as different electrical loads into the electrolyser, in the range of 3100 A to 5160 A. The separation step on the oxygen side consists of two separators, and a heat exchanger. From both oxygen separators, liquid samples were taken. This was analyzed for potassium ion (K+) contents using an XRF-Spectrometer. In addition, the volumetric flow rate was measured. These physical measurements formed the basis for the energy and material balances for the system. From the energy and material balances, the calculated oxygen solubility followed a trend of more dissolvement with decreased temperatures, with the highest mass fraction value of 0.189 out in the second separator. In comparison with literature levels, the calculations were concluded to be overestimated. The highest calculated oxygen purity level was 92.5 %. It was also observed a trend of higher purity together with higher loads and higher cooling conditions. Theoretical comparison using Faradays Law yielded non-linear behavior and showed limitations of the calculation methodology. This suggest that the results may differ from physical systems.
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