Process design tools and techno-economic analysis for capacitive deionization

WATER RESEARCH

卷:183

Article

Hasseler, Tristan D.¹  Ramachandran, Ashwin¹  Tarpeh, William A.²  Stadermann, Michael³  Santiago, Juan G.⁴ 

[1] Stanford Univ, Dept Aeronaut & Astronaut, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[4] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA

关键词: Water desalination;    Capacitive deionization;    Process design tool;    Electrode aging;    Techno-economic analysis;   

DOI  :  10.1016/j.watres.2020.116034

来源: Elsevier

【 摘 要 】

Capacitive deionization (CDI) devices use cyclical electrosorption on porous electrode surfaces to achieve water desalination. Process modeling and design of CDI systems requires accurate treatment of the coupling among input electrical forcing, input flow rates, and system responses including salt removal dynamics, water recovery, energy storage, and dissipation. Techno-economic analyses of CDI further require a method to calculate and compare between a produced commodity (e.g. desalted water) versus capital and operational costs of the system. We here demonstrate a new modeling and analysis tool for CDI developed as an installable Matlab program that allows direct numerical simulation of CDI dynamics and calculation of key performance and cost parameters. The program is provided for free and is used to run open-source Simulink models. The Simulink environment sends information to the program and allows for a drag and drop design space where users can connect CDI cells to relevant periphery blocks such as grid energy, battery, solar panel, waste disposal, and maintenance/labor cost streams. The program allows for simulation of arbitrary current forcing and arbitrary flow rate forcing of one or more CDI cells. We employ validated well-mixed reactor formulations together with a non-linear circuit model formulation that can accommodate a variety of electric double layer sub-models (e.g. for charge efficiency). The program includes a graphical user interface (GUI) to specify CDI plant parameters, specify operating conditions, run individual tests or parameter batch-mode simulations, and plot relevant results. The techno-economic models convert among dimensional streams of species (e.g. feed, desalted water, and brine), energy, and cost and enable a variety of economic estimates including levelized water costs. (c) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free