Membrane Capacitive Deionization for Cooling Water Intake Reduction in Thermal Power Plants: Lab to Pilot Scale Evaluation
| Autor: | Christophe Vanschepdael, Han Huynh, Wim De Schepper, Joost Helsen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Control and Optimization
Capacitive deionization cooling tower water Energy Engineering and Power Technology Thermal power station 02 engineering and technology 010501 environmental sciences 01 natural sciences 7. Clean energy Desalination lcsh:Technology 020401 chemical engineering Water cooling Cooling tower 0204 chemical engineering Electrical and Electronic Engineering response surface model power plant Engineering (miscellaneous) 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment lcsh:T Environmental engineering 6. Clean water Water resources Environmental science Water quality Surface water Energy (miscellaneous) |
| Zdroj: | Energies, Vol 13, Iss 6, p 1305 (2020) Energies; Volume 13; Issue 6; Pages: 1305 |
| ISSN: | 1996-1073 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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