Journal
DESALINATION
Volume 474, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2019.114189
Keywords
Supercritical water desalination (SCWD); Process modelling; Thermodynamics; Pilot plant validation
Categories
Funding
- Dutch Ministry of Economic Affairs
- Dutch Ministry of Infrastructure and Environment
- European Union Regional Development Fund
- Province of Fryslan
- Northern Netherlands Provinces
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [665874]
- research theme Desalination
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An experimental and modelling study was done to investigate supercritical water desalination (SCWD) with respect to energy consumption as a function of the NaCl concentration (0 to 20 wt%). Pilot plant experiments were performed for different flow rates and feed concentrations, and used for the validation of the thermodynamic models (eNRTL and Anderko & Pitzer) employed for phase equilibria and enthalpy calculations. Experimental and modelling results showed that the lowered heat capacity of the feed streams, while increasing the concentration from 0 to 7 wt%, leads to improved performance of the feed - supercritical water (SCW) heat exchanger (HEX), evident from a higher feed outlet temperature. For concentrations of >= 14 wt%, pre-heating of the feed, prior to the HEX, is recommended due to the decrease in the SCW recovery in the SCW-brine separator. The calculated duty, of the heater bringing the heat-exchanged feed to the separation temperature, decreases with NaCl concentration due to the decrease in the feed heat capacity. The calculated overall energy consumption of SCWD was between 0.71 and 0.90 MJ(th)/kg(feed). For higher concentration feeds, the energy input is divided between low - and high quality (temperature) heat.
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