用水与换热网络同步优化综合

Simultaneous integration of water utilization and heat exchange networks

通常采用分步策略进行用水与换热网络综合集成,难以实现新鲜水与公用工程的同时权衡。因此本文提出首先序贯求解用水网络综合子问题的非线性规划和换热网络综合子问题的混合整数非线性规划,以获取可行初值;然后,进行流程完备结构拓扑,并构造连接方程实现相关变量的传递;最后,联立用水与换热网络优化综合问题,基于GAMS平台采用DICOPT求解器,通过MATLAB接口控制求解程序流程,采用随机初值策略强化获得全局最优解的机会,以获取高置信度的全局最优解。最后通过对单杂质和多杂质系统实例计算,结果表明本文提出的方法能实现用水和用能网络的权衡,不但获得了比文献结果更好的优化网络方案,而且找出了包括文献结果的若干近优方案,为过程设计提供了多种备用选择。

A simultaneous mathematical programming method is proposed to formulate a mix integer non-linear programming （MINLP） model for one-step optimization of water-utilization and heat exchange network （WUN-HEN） designs with single- or multi-contaminant water streams. First, a comprehensive representation combining two separate superstructures is adopted to capture the structural characteristics of the integrated WUN-HEN. Then, a hybrid optimization strategy integrating stochastic and deterministic components is developed for the resulting MINLP model and. Finally, evolutionary strategies and manipulations are executed to enhance WUN-HEN configurations. Two illustrative examples are presented to demonstrate the validity and advantages of the nronosed annrnach.