Process Integration of Organic Rankine Cycle for Waste Heat Recovery in Industry Process and Optimization
Date Issued
2014
Date
2014
Author(s)
Chao, Tzu-Hsiang
Abstract
This thesis aims at developing a mathematical model for the synthesis of a heat exchanger network which can be
integrated 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).
%Not using any heuristics that are based on the concept of pinch points, the proposed superstructure for the synthesis
%of heat exchange networks is formulated as a MINLP optimization model.
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.
Numerical examples from the literature are supplied to demonstrate the applicability
the the proposed approach, and discussion and analysis can help finding the best scenario on waste heat recovery.
Subjects
最適化
超結構
熱交換器網路
有機朗肯循環
混合型整數非線性規劃
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-R01524089-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):edf4adbb1c60a7b8f4f33755ee467d3b