Membrane Capacitive Deionization for Cooling Water Intake Reduction in Thermal Power Plants: Lab to Pilot Scale Evaluation

Energies

Christophe Vanschepdael¹  Han Huynh¹  Joost Helsen²  Wim De Schepper² 

[1] ENGIE Lab, Rodestraat 125, 1630 Linkebeek, Belgium;VITO nv, Boeretang 200, 2400 Mol, Belgium;

关键词: cooling tower;    response surface model;    water;    power plant;   

DOI  :  10.3390/en13061305

来源: DOAJ

【 摘 要 】

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⁻³_evap), 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.

【 授权许可】

Unknown