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在反渗透海水淡化(SWRO)系统中,膜污染是一个导致渗透水性能降低和运营成本增加的重要因素。而关于反渗透海水淡化系统中的膜污染动态仿真的研究较少。本文以GAMS为建模工具,结合反渗透(RO)过程模型,建立卷式膜组件中膜内外部污染过程的动态模型,包括非平衡热力学、物料守恒等,并利用该模型仿真膜污染过程。仿真结果显示,膜组件上滤饼层的厚度变化、膜通量变化等和实际淡化厂的数据相吻合。而且该模型还能够较为准确地描述出卷式膜组件上各个位置的污染情况以及膜污染对RO过程变量的影响。表明该模型是准确有效的,对往后的SWRO系统研究或者对膜清洗的预测都有很好的借鉴意义。
In reverse osmosis desalination (SWRO) systems, membrane fouling is an important factor that leads to reduced permeate water performance and increased operating costs. However, there are few researches on dynamic simulation of membrane fouling in reverse osmosis desalination system. In this paper, a dynamic model of internal and external membrane contamination process in a membrane-based membrane module, including non-equilibrium thermodynamics and material conservation, is established by using GAMS as a modeling tool combined with a reverse osmosis (RO) process model. The membrane fouling process is simulated by this model. The simulation results show that the thickness of the cake layer on the membrane module changes, the membrane flux changes and the actual desalination plant data match. Moreover, the model can describe the pollution of each location on the membrane module and the influence of membrane pollution on the process variable of RO more accurately. The results show that the model is accurate and effective, which is of great reference to the future SWRO system research or the prediction of membrane cleaning.