间歇过程用水网络优化设计方法研究

Study on optimal design of water utilization network in batch processes

间歇过程用水网络的研究已经引起了人们的关注,近十年取得了一定的发展。本文对带有非传质及有流率变化的间歇化工用水过程用数学规划法进行优化设计,确定过程的最小新鲜水用量、最小废水排放量以及优化后的用水网络。该方法利用中间储罐来排除时间对水再利用的限制,考虑了用水单元的流率限制,建立用水网络超结构和非线性规划数学模型,利用GAMS求解该模型,得到间歇过程最小新鲜水用量、废水量以及优化后的网络结构。实例计算证明该模型可行、方法简单。

Because of the attention of the researchers, study on water utilization in batch processes have been developed within recent ten years. An approach based on mathematical programming is proposed to optimize water network which contains non-mass transfer and the change of flowrate in batch processes. The purpose is to determine minimum water usage and wastewater discharge, as well as the optimal water network. In order to reduce the restriction of time, storage tanks are used. With the restriction of flowrate, a superstructure of water utilization network and the non-linear programming mathematical model are constructed. The model is solved by GAMS （General Algebra Model System） and gained the minimum fresh water and wastewater. Two examples are used to illustrate the model, and the results show this approach is effective for the synthesis of water use network in batch processes.