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Title: | 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 |
Authors: | Feng-Yi Chang 張丰議 |
Advisor: | 陳誠亮(Cheng-Liang Chen) |
Keyword: | 最適化,超結構,熱交換器網路,有機朗肯循環,混合整數非線性規劃, Optimization,Superstructure,heat exchange networks,organic rankine cycle,Mixed-integer nonlinear programming (MINLP), |
Publication Year : | 2013 |
Degree: | 碩士 |
Abstract: | 本研究主旨在於探討應用有機朗肯循環(Organic Rankine Cycle, ORC)作工業程序廢熱回收之設計問題,並以數學規劃法進行熱交換器網路的設計。參考Yee and Grossmann(1990a,1990b)所提出之熱交換網路階層超結構,本文提出一整合式階層超結構,此一超結構涵蓋了程序流與程序流以及程序流與有機朗肯循環可能發生的熱交換配對情形。根據此超結構,吾人可將熱交換器網路之合成問題,轉換成為一個混合整數非線性規劃(MINLP)數學問題,此法不同於狹點技術需使用經驗法則,而是直接根據所提出之超結構,建立一個完整的最適化模式,因此可以考量任何能數學化之目標。在本論文中針對此熱交換器網路問題,將以兩個主要的步驟進行求解:(1)在未使用有機朗肯循環之前,合成具最少能源使用量之熱交換器網路;(2)基於步驟(1)所得的結果,使用有機朗肯循環回收程序中仍未被善加利用的廢熱,並以最大化渦輪輸出功為目標函數,得到一新的熱交換器網路。本文透過幾個例子,驗證了所提出的熱交換器網路超結構,以及所建立的混合整數非線性規劃問題,可以成功地合成出最佳化的有機朗肯循環工業程序廢熱回收系統。 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 interactions 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/6430 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 化學工程學系 |
Files in This Item:
File | Size | Format | |
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ntu-102-1.pdf | 3.26 MB | Adobe PDF | View/Open |
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