(283g) Thermodynamic Model-Based Synthesis Methodology to Design Optimal Heat-Integrated Work Exchanger Network

Heat integration has been widely and successfully practiced for recovering thermal energy, mostly through synthesizing heat exchanger networks (HENs) in the process industry over the past three decades. It was recognized another form of energy, mechanical energy, should be also recovered systematically. In 1996, Huang and Fan (1996) introduced a notion of work integration and a new type of process synthesis called work exchanger network (WEN) synthesis. Over the past few years, various process analysis and design methodologies have been proposed to develop WEN systems, some of which also involve thermal energy recovery (Liu et al., 2014; Onishi et al., 2014; Razib et al., 2012; Fu and Gundersen, 2016; Huang and Karimi, 2016). Recently, Amini-Rankouhi and Huang (2017) presented a mathematical modeling and analysis method to predict the maximum amount of mechanical energy that can be feasibly recovered using direct work exchangers prior to WEN configuration development. In this work, we will introduce a thermodynamic model-based synthesis approach to develop a heat-integrated work exchanger network (HIWEN), in which direct work exchangers may work under different operating conditions. Case studies will demonstrate that the resulting HIWENs can recover the maximum amount of mechanical and thermal energy simultaneously at the lowest cost. In this presentation, network implementation and operational challenges will be also discussed.

References:

Amini-Rankouhi, A. and Y. Huang," Prediction of Maximum Recoverable Mechanical Energy via Work Integration: A Thermodynamic Modeling and Analysis Approach," submitted, AIChE J., 2017.

Fu C, Gundersen T. Heat and work integration: Fundamental insights and applications to carbon dioxide capture processes. Energy Convers Manag. 2016; 121:36–48.

Huang K, Karimi I. Work-heat exchanger network synthesis (WHENS). Energy. 2016; 113:1006-1017.

Huang YL, Fan LT. Analysis of a work exchanger network. Ind Eng Chem Res. 1996; 35:3528-3538.

Liu GL, Zhou H, Shen RJ, Feng X. A graphical method for integrating work exchange network. Appl Energy. 2014; 114:588-599.

Onishi VC, Ravagnani M, Caballero JA. Simultaneous synthesis of work exchange networks with heat integration. Chem Eng Sci. 2014; 112:87-107.

Razib MS, Hasan MMF, Karimi IA. Preliminary synthesis of work exchange networks. Comput Chem Eng. 2012; 37:262-277.