LAPSE:2023.22079v1
Published Article
LAPSE:2023.22079v1
Membrane Capacitive Deionization for Cooling Water Intake Reduction in Thermal Power Plants: Lab to Pilot Scale Evaluation
Wim De Schepper, Christophe Vanschepdael, Han Huynh, Joost Helsen
March 23, 2023
Cooling of thermal power stations requires large amounts of surface water and contributes to the increasing pressure on water resources. Water use efficiency of recirculating cooling towers (CT) is often kept low to prevent scaling. Partial desalination of CT feed water with membrane capacitive deionization (MDCI) can improve water quality but also results in additional water loss. A response surface methodology is presented in which optimal process conditions of the MCDI-CT system are determined in view of water use efficiency and cost. Maximal water use efficiency at minimal cost is found for high adsorption current (2.5 A) and short adsorption time (900 s). Estimated cost for MCDI to realize maximal MCDI-CT water use efficiency is relatively high (2.0−3.1 € m−3evap), which limits applicability to plants facing high intake water costs or water uptake limitations. MCDI-CT pilot tests show that water use efficiency strongly depends on CT operational pH. To allow comparison among pilot test runs, simulation software is used to recalculate CaCO3 scaling and acid dosage for equal operational pH. Comparison at equal pH shows that MCDI technology allows a clear reduction of CT water consumption (74%−80%) and acid dosage (63%−80%) at pH 8.5.
Keywords
cooling tower, power plant, response surface model, Water
Suggested Citation
De Schepper W, Vanschepdael C, Huynh H, Helsen J. Membrane Capacitive Deionization for Cooling Water Intake Reduction in Thermal Power Plants: Lab to Pilot Scale Evaluation. (2023). LAPSE:2023.22079v1
Author Affiliations
De Schepper W: VITO nv, Boeretang 200, 2400 Mol, Belgium
Vanschepdael C: ENGIE Lab, Rodestraat 125, 1630 Linkebeek, Belgium
Huynh H: ENGIE Lab, Rodestraat 125, 1630 Linkebeek, Belgium
Helsen J: VITO nv, Boeretang 200, 2400 Mol, Belgium [ORCID]
Journal Name
Energies
Volume
13
Issue
6
Article Number
E1305
Year
2020
Publication Date
2020-03-11
ISSN
1996-1073
Version Comments
Original Submission
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PII: en13061305, Publication Type: Journal Article
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LAPSE:2023.22079v1
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https://doi.org/10.3390/en13061305
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Mar 23, 2023
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CC BY 4.0
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