Currently,the problem of water scarcity and water pollution is increasingly severe. It is an effective way of fresh water conservation and environmental protection by reusing regenerated wastewater. In order to achieve reasonable utilization of process sources with different qualities for maximum reuse of water in batch processes,a superstructure of water-using network was proposed involving source-sink,source-intermediate storage tank-sink,source-continuous regeneration system-sink and source-wastewater disposal system. The mathematical formulation is based on a continuous time representation. With multi-objective optimization design method,design problems for minimizing the freshwater consumption,the regeneration rate of the regeneration unit and the number of intermediate storage tanks can be achieved in turn. Finally,an applicable network configuration with the minimum amount of freshwater consumption and wastewater discharge was obtained. Additionally,in consideration of the actual production process ofmultiple batch cycles,this paper focused on the design,analysis and optimization problem of water-using network from start-up to the steady state. A case study was solved to demonstrate the effectiveness of the proposed approach.%当前,水资源短缺与污染问题日益严重,废水再生后回用对节约水源和保护环境具有重要的意义.针对间歇过程,为了合理利用不同品质的过程水源,实现用水系统的最大水回用,本文建立了一个包含水源-水阱、水源-中间储罐-水阱、水源-连续再生体系-水阱与水源-废水处理系统的用水网络超结构,基于连续时间模型建立数学模型,并采用多目标分步法依次优化新鲜水用量、再生单元的再生速率以及中间储罐数目,最终得到新鲜水消耗量以及废水排放量最小的最优用水网络结构.同时,为贴近实际生产中的多操作周期过程,本文针对用水系统从启动周期到稳定周期的全过程,进行了用水网络的设计、分析与优化.最后通过算例计算,验证了本文所提方法的合理有效性.
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