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Simultaneous optimisation and heat integration of evaporation systems including mechanical vapour recompression and background process

机译：蒸发系统的同时优化和热集成，包括机械蒸汽再压缩和背景过程

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摘要

This paper proposes a general superstructure and a Mixed-Integer Nonlinear Programming (MINLP) model for the synthesis and simultaneous optimisation and Heat Integration (HI) of Single- and Multiple-Effect Evaporation (SEE/MEE) systems including Mechanical Vapour Recompression (MVR) and the background process. The proposed superstructure also includes different flow patterns (forward feed, backward feed, parallel feed and mixed feed), Flashing of Condensates (FCs), single- and multi-stage MVR systems and various HI opportunities for preheating of feed stream (e.g. with condensates, bled vapours, and hot streams from the background process). The newly proposed SEE/MEE-FC-MVR superstructure is combined with a Heat Exchanger Network (HEN) superstructure for performing simultaneous optimisation and HI. On the basis of this combined superstructure, an MINLP model with tight bounds on the variables is developed and implemented for its solution in the General Algebraic Modeling System (GAMS). The model is solved using a two-step solution strategy. The proposed model enables to explore simultaneously all interconnections within the proposed superstructure in order to find the configuration with the optimal trade-offs between capital and energy costs as demonstrated in this paper for different cases of a milk concentration process.
机译：本文提出了一种通用的上部结构和混合整数非线性规划（MINLP）模型，用于单效和多效蒸发（SEE / MEE）系统的合成，同时优化和热集成（HI），包括机械蒸汽压缩（MVR）和后台进程。拟议的上部结构还包括不同的流型（正向进料，向后进料，平行进料和混合进料），冷凝水闪蒸（FC），单级和多级MVR系统以及各种预热进料流（例如冷凝水）的HI机会。 ，流血的蒸气和来自后台进程的热流）。新提出的SEE / MEE-FC-MVR上层结构与热交换器网络（HEN）上层结构相结合，可以同时进行优化和HI。在此组合上层结构的基础上，开发了一个在变量上具有严格边界的MINLP模型，并在通用代数建模系统（GAMS）中对其求解进行了实现。该模型使用两步求解策略进行求解。所提出的模型能够同时探索所提议的上层建筑内的所有互连，以找到在资本和能源成本之间具有最佳权衡的配置，如本文针对牛奶浓缩工艺的不同情况所证明的那样。

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