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Open AccessArticle

Simultaneous Synthesis of Heat Exchanger Networks Considering Steam Supply and Various Steam Heater Locations

1
School of Chemical Engineering, Institute of Chemical Process Systems Engineering, Dalian University of Technology, Liaoning, Dalian 116024, China
2
Key Laboratory of Liaoning Province for Desalination, School of Energy and Power Engineering, Dalian University of Technology, Liaoning, Dalian 116024, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(6), 1467; https://doi.org/10.3390/en13061467
Received: 10 February 2020 / Revised: 15 March 2020 / Accepted: 17 March 2020 / Published: 20 March 2020
In process industries, the heating gap in heat exchanger networks (HENs) is normally compensated by the steam generated from a utility system, thus these two mutually influencing systems should be designed as a whole through establishing structural interrelationships. In this work, an improved stage-wise superstructure of HENs is proposed to integrate with a Rankine cycle-based utility system. Inner- and inter-stage heaters are considered in the new structure. Furthermore, the selection of steam in different levels is also investigated, extending the possibilities of steam utilization in HENs and generation in utility systems. The presented methodology is able to realize the optimal design of HENs by considering the supply and utilization of steam. Heaters’ allocations, matches of streams, steam distribution and utilization are optimized accompanying with the trade-off amongst equipment investment, fuel consumption and power generation in objective, which is highly related to the final structure of the system. The optimization problem is formulated into a mixed-integer non-linear programming (MINLP) model and solved towards the lowest total annual cost (TAC) of the entire system. Finally, a case study with two scenarios is studied. The detailed results are given and analyzed to demonstrate the benefit from structural improvement. View Full-Text
Keywords: improved superstructure; HENs; utility system; steam heater; MINLP improved superstructure; HENs; utility system; steam heater; MINLP
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MDPI and ACS Style

Sheng, Y.; Liu, L.; Zhuang, Y.; Zhang, L.; Du, J. Simultaneous Synthesis of Heat Exchanger Networks Considering Steam Supply and Various Steam Heater Locations. Energies 2020, 13, 1467.

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