膜电容去离子法海水淡化装置单元脱盐过程的数值模拟

本文针对一种基于中部流入式的膜电容法脱盐装置组件,建立了脱盐单元的三维瞬态分析模型。在对模拟结果线性回归拟合验证了该模型适用性基础上,对脱盐单元进行了数值模拟分析。结果表明:随着入口孔径的增大,MCDI脱盐单元的出口最低浓度升高,而出口最高浓度降低;且入口孔径越大,其达到吸附饱和的时间越长,但吸附效率越小,脱附时间也相应增加,脱附效率能够达到的峰值也越大;同一入口孔径条件下,反接脱附方式下能够达到的最高出口浓度均高于短接方式。

Numerical simulation of desalting process in seawater desalination plant by membrane capacitive deionization

Based on the middle inflow type desalting module in membrane capacitance method,a three-dimensional transient analysis model of desalting unit was established.Then the applicability of the model was verified by linear regression fitting of simulation results,and the desalting unit was analyzed by numerical simulation.The results show that with the increase of inlet aperture,the minimum outlet concentration ofMCDI desalting unit increases,while the maximum decreases.The larger the inlet aperture,the longer the desalting unit reaches the adsorption saturation time,and the smaller the adsorption efficiency,yet the more the desorption time increases,and the higher the desorption efficiency peak.Under the same inlet aperture,the maximum outlet concentration in reverse desorption mode both achieves higher than that in short.