Simultaneous synthesis of work exchange networks with heat integration
Simultaneous synthesis of work exchange networks with heat integration
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DOI：
10.1016/j.ces.2014.03.018
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发表时间：
2014-06
影响因子：
4.7
通讯作者：
V. Onishi;M. Ravagnani;J. Caballero
中科院分区：
文献类型：
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作者：
V. Onishi;M. Ravagnani;J. Caballero
功及其与热的相互作用的最佳集成可以代表工业工厂的大量节能。本文介绍了一种新的优化模型的同时综合的功交换网络（WENs），与热集成的最佳压力恢复的工艺气流。所提出的WEN合成方法类似于众所周知的热交换器网络（HENs）的合成问题。因此，在高压（HP）和低压（LP）流之间存在功交换，这通过在公共轴线上运行的压力操纵设备来实现。该模型允许使用多个单元的单轴涡轮压缩机（SSTC），以及独立的压缩机，涡轮机和阀门。辅助电动机和发电机用于应对任何需求和过剩的能源。此外，在WEN阶段之间，流被发送到HEN以促进热回收，旨在增强工作集成。提出了一种多级超结构来表示该过程。WEN超结构优化的混合整数非线性规划（MINLP）制定和解决的GAMS软件，以最小化的总年成本的目标。通过三个算例验证了该方法的准确性。在所有案例研究中，WEN级之间的热集成对于提高压力恢复和降低工艺中涉及的总成本至关重要。
The optimal integration of work and its interaction with heat can represent large energy savings in industrial plants. This paper introduces a new optimization model for the simultaneous synthesis of work exchange networks (WENs), with heat integration for the optimal pressure recovery of process gaseous streams. The proposed approach for the WEN synthesis is analogous to the well-known problem of synthesis of heat exchanger networks (HENs). Thus, there is work exchange between high-pressure (HP) and low-pressure (LP) streams, achieved by pressure manipulation equipment running on common axes. The model allows the use of several units of single-shaft-turbine-compressor (SSTC), as well as stand-alone compressors, turbines and valves. Helper motors and generators are used to respond to any demand and excess of energy. Moreover, between the WEN stages the streams are sent to the HEN to promote thermal recovery, aiming to enhance the work integration. A multi-stage superstructure is proposed to represent the process. The WEN superstructure is optimized in a mixed-integer nonlinear programming (MINLP) formulation and solved with the GAMS software, with the goal of minimizing the total annualized cost. Three examples are conducted to verify the accuracy of the proposed method. In all case studies, the heat integration between WEN stages is essential to improve the pressure recovery, and to reduce the total costs involved in the process.