有機朗肯循環在工業程序廢熱回收之應用

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國立臺灣大學工程學院化學工程學所碩士論文

Department of Chemical Engineering College of Engineering

National Taiwan University Master Thesis

有機朗肯循環在工業程序廢熱回收之應用

Process Integration of Organic Rankine Cycle for Waste Heat Recovery in Industrial Process

張丰議 Feng-Yi Chang

指導教授：陳誠亮博士 Advisor: Cheng-Liang Chen, Ph.D.

中華民國 102 年 7 月 July, 2013

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Abstract

This thesis aims at developing a mathematical model for the synthesis of a heat exchanger network which can integrate with the organic rankine cycle (ORC) for recovery of low-grade waste heat. An integrated stagewise superstructure, which is analogous to the superstructure introduced by Yee and Grossmann for the synthesis of heat exchanger networks, is proposed for including the ORC as part of the heat recovery system. The integrated stagewise superstructure can represent all possible interconnections and inter- actions between process streams and the ORC. Based on this superstructure, the synthesis of heat exchanger networks with the ORC streams is formulated as a mixed-integer nonlinear program (MINLP).

A two-steps solution method is suggested to solve the MINLP problem: (1) A heat exchanger network excluding the ORC is solved for minimizing the utility consumption;

(2) Based on the results of step one, a modified network including the ORC below the pinch point is synthesized for maximizing the generated work from the ORC turbine.

Some numerical examples from the literature are supplied to demonstrate the applicability the the proposed approach.

Key words: Optimization, Superstructure, heat exchange networks, organic rankine cycle, Mixed-integer nonlinear programming (MINLP)

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5 T_m,out^e = 186.5^◦C; T_m,out^c = 75^◦C . . . 85

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16 T_m,out^e = 200^◦C; T_m,out^c = 85^◦C . . . 91

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