Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods

doi:10.1016/j.cjche.2019.03.014

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (2): 456-465.DOI: 10.1016/j.cjche.2019.03.014

• Process Systems Engineering and Process Safety • Previous Articles Next Articles

Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods

Chenglin Chang¹, Yufei Wang¹, Xiao Feng²

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 School of Chemical Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received:2019-01-03 Revised:2019-02-22 Online:2020-05-21 Published:2020-02-28
Contact: Yufei Wang
Supported by:
Financial supports from the National Natural Science Foundation of China (No. 21476256) and Science Foundation of China University of Petroleum, Beijing (Nos. 2462017BJB03 & 2462018BJC004) are gratefully acknowledged.

Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods

Chenglin Chang¹, Yufei Wang¹, Xiao Feng²

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 School of Chemical Engineering, Xi'an Jiaotong University, Xi'an 710049, China

通讯作者: Yufei Wang
基金资助:
Financial supports from the National Natural Science Foundation of China (No. 21476256) and Science Foundation of China University of Petroleum, Beijing (Nos. 2462017BJB03 & 2462018BJC004) are gratefully acknowledged.

Abstract

Abstract: Heat exchanger networks (HENs) in separated plants can be simultaneously synthesized through process streams directly or intermediate fluids indirectly. However, the direct and indirect methods are studied separately in most existing researches. As the result, conventional designs are probably suboptimal, because optimal solutions may call for hybrid approach wherein direct and indirect integration methods are used synchronously. To circumvent this drawback aforementioned, we propose in this research a novel methodology to synthesize multi-plant HENs considering both direct and indirect approaches. The methodology employs a novel superstructure covering most potential topologies for both interplant and intra-plant heat integration. We also take into account multiple kinds of intermediate fluids for indirect integration and this has not been fully addressed in previous research. A mixed-integer nonlinear programming (MINLP) is formulated to optimize multi-plant HENs involving indirect and direct methods. One example from existing literature and one industrial problem are solved to demonstrate the methodology's capability.

Key words: HENs, Multi-plant, Heat integration, Superstructure, MINLP

摘要： Heat exchanger networks (HENs) in separated plants can be simultaneously synthesized through process streams directly or intermediate fluids indirectly. However, the direct and indirect methods are studied separately in most existing researches. As the result, conventional designs are probably suboptimal, because optimal solutions may call for hybrid approach wherein direct and indirect integration methods are used synchronously. To circumvent this drawback aforementioned, we propose in this research a novel methodology to synthesize multi-plant HENs considering both direct and indirect approaches. The methodology employs a novel superstructure covering most potential topologies for both interplant and intra-plant heat integration. We also take into account multiple kinds of intermediate fluids for indirect integration and this has not been fully addressed in previous research. A mixed-integer nonlinear programming (MINLP) is formulated to optimize multi-plant HENs involving indirect and direct methods. One example from existing literature and one industrial problem are solved to demonstrate the methodology's capability.

关键词: HENs, Multi-plant, Heat integration, Superstructure, MINLP

Chenglin Chang, Yufei Wang, Xiao Feng. Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods[J]. Chinese Journal of Chemical Engineering, 2020, 28(2): 456-465.

Chenglin Chang, Yufei Wang, Xiao Feng. Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods[J]. 中国化学工程学报, 2020, 28(2): 456-465.

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Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods

Optimal synthesis of multi-plant heat exchanger networks considering both direct and indirect methods

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