Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model

doi:10.1016/j.cjche.2017.03.021

›› 2017, Vol. 25 ›› Issue (8): 1052-1060.DOI: 10.1016/j.cjche.2017.03.021

Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model

Yu Zhuang¹, Linlin Liu^1,2, Qilei Liu¹, Jian Du¹

1 Institute of Chemical Process Systems Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;
2 Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

收稿日期:2016-09-16 修回日期:2016-10-31 出版日期:2017-08-28 发布日期:2017-09-11
通讯作者: Jian Du
基金资助:
Supported by the National Natural Science Foundation of China (21576036, 21406026).

Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model

Yu Zhuang¹, Linlin Liu^1,2, Qilei Liu¹, Jian Du¹

1 Institute of Chemical Process Systems Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;
2 Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

Received:2016-09-16 Revised:2016-10-31 Online:2017-08-28 Published:2017-09-11
Supported by:
Supported by the National Natural Science Foundation of China (21576036, 21406026).

摘要/Abstract

摘要： Due to the deterioration of serious energy dilemma, energy-conservation and emission–reduction have been the strategic target in the past decades, thus people have identified the vital importance of higher energy efficiency and the influence of lower carbon development. Since work exchange network is a significant part of energy recovery system, its optima design will have dramatically significant effect on energy consumption reduction in chemical process system. With an extension of the developed transshipment model in isothermal process, a novel step-wise methodology for synthesis of direct work exchange network (WEN) in adiabatic process involving heat integration is first proposed in this paper, where a nonlinear programming (NLP) model is formulated by regarding the minimum utility consumption as objective function and optimizing the initial WEN in accordance with the presented matching rules to get the optimized WEN configuration at first. Furthermore, we focus on the work exchange network synthesis with heat integration to attain the minimal total annual cost (TAC) with the introduction of heat-exchange equipment that is achieved by the following strategies in sequence: introducing heat-exchange equipment directly, adjusting the work quantity of the adjacent utility compressors or expanders, and approximating upper/lower pressure limits consequently to obtain considerable cost savings of expanders or compressors and work utility. Finally, a case taken from the literature is studied to illustrate the feasibility and effectiveness of the proposed method.

关键词: Work exchange network, Transshipment model, Adiabatic process, Trade-off between work and heat, Economic analysis

Abstract: Due to the deterioration of serious energy dilemma, energy-conservation and emission–reduction have been the strategic target in the past decades, thus people have identified the vital importance of higher energy efficiency and the influence of lower carbon development. Since work exchange network is a significant part of energy recovery system, its optima design will have dramatically significant effect on energy consumption reduction in chemical process system. With an extension of the developed transshipment model in isothermal process, a novel step-wise methodology for synthesis of direct work exchange network (WEN) in adiabatic process involving heat integration is first proposed in this paper, where a nonlinear programming (NLP) model is formulated by regarding the minimum utility consumption as objective function and optimizing the initial WEN in accordance with the presented matching rules to get the optimized WEN configuration at first. Furthermore, we focus on the work exchange network synthesis with heat integration to attain the minimal total annual cost (TAC) with the introduction of heat-exchange equipment that is achieved by the following strategies in sequence: introducing heat-exchange equipment directly, adjusting the work quantity of the adjacent utility compressors or expanders, and approximating upper/lower pressure limits consequently to obtain considerable cost savings of expanders or compressors and work utility. Finally, a case taken from the literature is studied to illustrate the feasibility and effectiveness of the proposed method.

Key words: Work exchange network, Transshipment model, Adiabatic process, Trade-off between work and heat, Economic analysis

Yu Zhuang, Linlin Liu, Qilei Liu, Jian Du. Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model[J]. , 2017, 25(8): 1052-1060.

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Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model

Step-wise synthesis of work exchange networks involving heat integration based on the transshipment model

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